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1
Commits
| Author | SHA1 | Date | |
|---|---|---|---|
 Niels Lohmann
|
37316992ed |
@@ -25,7 +25,6 @@ cc_library(
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"include/nlohmann/detail/conversions/from_json.hpp",
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"include/nlohmann/detail/conversions/to_chars.hpp",
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"include/nlohmann/detail/conversions/to_json.hpp",
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"include/nlohmann/detail/conversions/zmij.hpp",
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"include/nlohmann/detail/exceptions.hpp",
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"include/nlohmann/detail/hash.hpp",
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"include/nlohmann/detail/input/binary_reader.hpp",
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@@ -1391,10 +1391,9 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
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- The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright © 2008-2009 [Björn Hoehrmann](https://bjoern.hoehrmann.de/) <bjoern@hoehrmann.de>
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- The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright © 2009 [Florian Loitsch](https://florian.loitsch.com/)
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- The class contains a port of the shortest double-to-decimal conversion of [Żmij](https://github.com/vitaut/zmij) by Victor Zverovich, which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright © 2025 [Victor Zverovich](https://github.com/vitaut)
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- The class contains a copy of [Hedley](https://nemequ.github.io/hedley/) from Evan Nemerson which is licensed as [CC0-1.0](https://creativecommons.org/publicdomain/zero/1.0/).
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- The class contains parts of [Google Abseil](https://github.com/abseil/abseil-cpp) which is licensed under the [Apache 2.0 License](https://opensource.org/licenses/Apache-2.0).
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- The class contains an adapted version of the Eisel-Lemire algorithm, its table of powers of five, and its digit comparison for long numbers from [fast_float](https://github.com/fastfloat/fast_float) by Daniel Lemire and contributors, which is available under the [MIT License](https://opensource.org/licenses/MIT) (used here), the Apache 2.0 License, and the Boost Software License. Copyright © 2021 The fast_float authors
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- The class contains an adapted version of the Eisel-Lemire algorithm and its table of powers of five from [fast_float](https://github.com/fastfloat/fast_float) by Daniel Lemire and contributors, which is available under the [MIT License](https://opensource.org/licenses/MIT) (used here), the Apache 2.0 License, and the Boost Software License. Copyright © 2021 The fast_float authors
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<img align="right" src="https://git.fsfe.org/reuse/reuse-ci/raw/branch/master/reuse-horizontal.png" alt="REUSE Software">
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@@ -62,9 +62,6 @@ Linear.
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## Notes
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Floating-point numbers are written with the fewest digits that read back as the same value (for `#!cpp double`; see
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[number handling](../../features/types/number_handling.md#number-serialization)).
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Binary values are serialized as an object containing two keys:
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- "bytes": an array of bytes as integers
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@@ -100,5 +97,3 @@ Binary values are serialized as an object containing two keys:
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- Error handlers added in version 3.4.0.
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- Serialization of binary values added in version 3.8.0.
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- Error handler `keep` added in version 3.13.0.
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- Doubles are written with the shortest digits (Żmij instead of Grisu2) since version 3.13.0; about 0.1% of doubles are
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written differently, most of them with fewer digits.
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@@ -23,10 +23,9 @@ type to use.
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## Template parameters
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`NumberFloatType`
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: the type to store floating-point numbers. The parser converts `#!cpp float`, `#!cpp double`, and a
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`#!cpp long double` that is IEEE 754 binary64 itself and other `#!cpp long double` formats with
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`#!cpp std::from_chars` or `#!cpp std::strtold`, and serialization falls back to `#!cpp std::snprintf`, so the
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type must be `#!cpp float`, `#!cpp double`, or `#!cpp long double`. The
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: the type to store floating-point numbers. Parsing and serialization are implemented in terms of
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`#!cpp std::strtof`/`#!cpp std::strtod`/`#!cpp std::strtold` and `#!cpp std::snprintf`, so the type must be
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`#!cpp float`, `#!cpp double`, or `#!cpp long double`. The
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[binary formats](../../features/binary_formats/index.md) additionally require `#!cpp float` or `#!cpp double`,
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because they have no encoding for `#!cpp long double`. See
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[Template Parameter Requirements](../../features/types/template_parameters.md#numberfloattype).
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@@ -82,13 +82,12 @@ flowchart TD
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- Numbers with a decimal digit or scientific notation are always stored as `#!c double`.
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- The number types can be changed, see [Template number types](#template-number-types).
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- The library converts integers and floating-point numbers itself, independent of the locale. Floating-point
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numbers are correctly rounded (to nearest, ties to even). Only a `#!c long double` that is not IEEE 754 binary64
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(e.g., the 80-bit x87 format) is converted with `#!cpp std::from_chars` where available, or else with
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[`std::strtold`](https://en.cppreference.com/w/cpp/string/byte/strtof). For that call, the library temporarily
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replaces the `.` with the decimal point of the current locale (which may be longer than one byte, e.g., in
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`fa_IR.UTF-8`), so the result does not depend on the locale either. Changing the locale in another thread during
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parsing is undefined behavior of the C library, though. Before version 3.13.0, the conversion was realized by
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- Integers are converted by the library's own digit parser. Floating-point numbers are converted with
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[`std::from_chars`](https://en.cppreference.com/w/cpp/utility/from_chars) if the library is compiled with C++17
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and the standard library supports it, then with an exact fast path for `#!c double` values with few significant
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digits, and otherwise with the locale-aware
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[`std::strtod`](https://en.cppreference.com/w/cpp/string/byte/strtof) (`std::strtof`/`std::strtold` for the
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other floating-point types). Before version 3.13.0, the conversion was realized by
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[`std::strtoull`](https://en.cppreference.com/w/cpp/string/byte/strtoul),
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[`std::strtoll`](https://en.cppreference.com/w/cpp/string/byte/strtol), and `std::strtod`, respectively.
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@@ -101,10 +100,10 @@ flowchart TD
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### Number limits
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- Any 64-bit signed or unsigned integer can be stored without loss of precision.
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- Numbers exceeding the limits of `#!c double` (i.e., numbers whose rounded value is not satisfying
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- Numbers exceeding the limits of `#!c double` (i.e., numbers that after conversion via
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[`std::strtod`](https://en.cppreference.com/w/cpp/string/byte/strtof) are not satisfying
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[`std::isfinite`](https://en.cppreference.com/w/cpp/numeric/math/isfinite) such as `#!c 1E400`) will throw exception
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[`json.exception.out_of_range.406`](../../home/exceptions.md#jsonexceptionout_of_range406) during parsing. Numbers too
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small for `#!c double` (such as `#!c 1E-400`) become zero, with the sign of the number.
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[`json.exception.out_of_range.406`](../../home/exceptions.md#jsonexceptionout_of_range406) during parsing.
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- Floating-point numbers are rounded to the next number representable as `double`. For instance
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`#!c 3.141592653589793238462643383279` is stored as [`0x400921fb54442d18`](https://float.exposed/0x400921fb54442d18).
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This is the same behavior as the code `#!c double x = 3.141592653589793238462643383279;`.
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@@ -134,10 +133,9 @@ That is, `-0` is stored as a signed integer, but the serialization does not repr
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### Number serialization
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- Integer numbers are serialized as is; that is, no scientific notation is used.
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- Floating-point numbers are serialized with the fewest digits that read back as the same value (the closest such
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digits if there are several), in the layout of the `#!c %g` printf modifier: `#!c 1.5`, `#!c 100.0`, `#!c 1e+100`.
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Doubles are converted with the algorithm of [Żmij](https://github.com/vitaut/zmij), floats with Grisu2, which
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can write more digits than necessary.
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- Floating-point numbers are serialized as specified by the `#!c %g` printf modifier with
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[`std::numeric_limits<double>::max_digits10`](https://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10)
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significant digits. The rationale is to use the shortest representation while still allowing round-tripping.
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!!! hint "Notes regarding precision of floating-point numbers"
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@@ -26,9 +26,9 @@ Requirements are split into two groups:
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diagnosed with dedicated error messages, and violating most of them results in a compiler error somewhere inside
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the library. Four violations are not caught at compile time at all:
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- A [`StringType`](#stringtype) whose `data()` is not null-terminated compiles and silently misparses numbers
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stored as a `#!cpp long double` that is not IEEE 754 binary64 (e.g., the 80-bit x87 format), because the lexer
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hands the buffer to `#!cpp std::strtold`.
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- A [`StringType`](#stringtype) whose `data()` is not null-terminated compiles and can silently misparse
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floating-point numbers, because the lexer may hand the buffer to `#!cpp std::strtod`, which reads up to the
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terminating null character.
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- A stateful [`AllocatorType`](#allocatortype) compiles and silently ignores its state: allocation, deallocation,
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and [`get_allocator()`](../../api/basic_json/get_allocator.md) each use a different default-constructed instance.
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- The two [cross-specialization conversions](#cross-specialization-conversions) below. These abort on an assertion
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@@ -537,18 +537,16 @@ therefore silently changes parse results rather than raising an error. See
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`NumberFloatType` must be one of `#!cpp float`, `#!cpp double`, or `#!cpp long double`:
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- The [parser](../parsing/index.md) converts number literals to `#!cpp float`, `#!cpp double`, and a
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`#!cpp long double` that is IEEE 754 binary64 itself; other `#!cpp long double` formats are converted with
|
||||
`#!cpp std::from_chars` where available, or with `#!cpp std::strtold`. The library provides overloads for exactly
|
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these three types.
|
||||
- The [parser](../parsing/index.md) converts number literals with `#!cpp std::from_chars` or, as a fallback, with
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`#!cpp std::strtof`, `#!cpp std::strtod`, or `#!cpp std::strtold`; the library provides overloads for exactly these
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three types.
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- [`dump`](../../api/basic_json/dump.md) falls back to `#!cpp std::snprintf` with the `%g` and `%Lg` conversion
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specifiers, for which the library likewise provides only `#!cpp double` and `#!cpp long double` overloads
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(`#!cpp float` is promoted to `#!cpp double`).
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If `#!cpp std::numeric_limits<NumberFloatType>` describes an IEEE 754 binary64 number, `dump` uses the algorithm of
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Żmij, which produces the shortest representation that round-trips. For IEEE 754 binary32 numbers, it uses Grisu2,
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which produces a short representation that round-trips. Otherwise the `snprintf` fallback with `max_digits10` digits is
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used.
|
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If `#!cpp std::numeric_limits<NumberFloatType>` describes an IEEE 754 binary32 or binary64 number, `dump` uses the
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Grisu2 algorithm, which produces the shortest representation that round-trips. Otherwise the `snprintf` fallback with
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`max_digits10` digits is used.
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### Required for the binary formats
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@@ -560,7 +558,7 @@ binary32 or binary64 field and have no encoding for `#!cpp long double`.
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| Type | Support |
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|--------------------------|-----------------------------------------------------------------------------------------------------------------------|
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| `#!cpp double` (default) | full; shortest round-trip output through Żmij |
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| `#!cpp double` (default) | full; short round-trip output through Grisu2 |
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| `#!cpp float` | full; short round-trip output through Grisu2 |
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| `#!cpp long double` | `dump` and `parse` only; the binary format writers do not compile, as they only handle IEEE 754 binary32 and binary64 |
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| any other type | not usable |
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|
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@@ -18,8 +18,6 @@ The class contains the UTF-8 Decoder from Bjoern Hoehrmann which is licensed und
|
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|
||||
The class contains a slightly modified version of the Grisu2 algorithm from Florian Loitsch which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright © 2009 [Florian Loitsch](https://florian.loitsch.com/)
|
||||
|
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The class contains a port of the shortest double-to-decimal conversion of [Żmij](https://github.com/vitaut/zmij) by Victor Zverovich, which is licensed under the [MIT License](https://opensource.org/licenses/MIT) (see above). Copyright © 2025 [Victor Zverovich](https://github.com/vitaut)
|
||||
|
||||
The class contains a copy of [Hedley](https://nemequ.github.io/hedley/) from Evan Nemerson which is licensed as [CC0-1.0](https://creativecommons.org/publicdomain/zero/1.0/).
|
||||
|
||||
The class contains an adapted version of the Eisel-Lemire algorithm, its table of powers of five, and its digit comparison for long numbers from [fast_float](https://github.com/fastfloat/fast_float) by Daniel Lemire and contributors, which is available under the [MIT License](https://opensource.org/licenses/MIT) (used here), the Apache 2.0 License, and the Boost Software License. Copyright © 2021 The fast_float authors
|
||||
The class contains an adapted version of the Eisel-Lemire algorithm and its table of powers of five from [fast_float](https://github.com/fastfloat/fast_float) by Daniel Lemire and contributors, which is available under the [MIT License](https://opensource.org/licenses/MIT) (used here), the Apache 2.0 License, and the Boost Software License. Copyright © 2021 The fast_float authors
|
||||
|
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@@ -39,25 +39,6 @@ inline int count_leading_zeros(std::uint64_t x) noexcept
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#endif
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}
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|
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/// number of trailing zero bits of x (x != 0)
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inline int count_trailing_zeros(std::uint64_t x) noexcept
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_ctzll(x);
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#else
|
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int n = 0;
|
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for (int shift = 32; shift != 0; shift >>= 1)
|
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{
|
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if ((x << (64 - shift)) == 0)
|
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{
|
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n += shift;
|
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x >>= shift;
|
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}
|
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}
|
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return n;
|
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#endif
|
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}
|
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|
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/// the 128-bit product of two 64-bit numbers
|
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struct uint128_parts
|
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{
|
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@@ -86,21 +67,15 @@ inline uint128_parts full_multiplication(std::uint64_t a, std::uint64_t b) noexc
|
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}
|
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|
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/// eight bytes as a little-endian word (compilers fold this into one load on
|
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/// little-endian targets; always inlined, as GCC otherwise calls it in the
|
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/// number loops)
|
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JSON_HEDLEY_ALWAYS_INLINE std::uint64_t read_eight_bytes(const unsigned char* b) noexcept
|
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/// little-endian targets)
|
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inline std::uint64_t read_eight_bytes(const char* p) noexcept
|
||||
{
|
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const auto* b = reinterpret_cast<const unsigned char*>(p); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
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return static_cast<std::uint64_t>(b[0]) | (static_cast<std::uint64_t>(b[1]) << 8u)
|
||||
| (static_cast<std::uint64_t>(b[2]) << 16u) | (static_cast<std::uint64_t>(b[3]) << 24u)
|
||||
| (static_cast<std::uint64_t>(b[4]) << 32u) | (static_cast<std::uint64_t>(b[5]) << 40u)
|
||||
| (static_cast<std::uint64_t>(b[6]) << 48u) | (static_cast<std::uint64_t>(b[7]) << 56u);
|
||||
}
|
||||
|
||||
/// eight bytes as a little-endian word
|
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JSON_HEDLEY_ALWAYS_INLINE std::uint64_t read_eight_bytes(const char* p) noexcept
|
||||
{
|
||||
return read_eight_bytes(reinterpret_cast<const unsigned char*>(p)); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
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}
|
||||
|
||||
} // namespace detail
|
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NLOHMANN_JSON_NAMESPACE_END
|
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|
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@@ -11,32 +11,11 @@
|
||||
|
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#include <array> // array
|
||||
#include <cmath> // signbit, isfinite
|
||||
#include <cstddef> // size_t
|
||||
#include <cstdint> // intN_t, uintN_t
|
||||
#include <cstring> // memcpy, memmove
|
||||
#include <limits> // numeric_limits
|
||||
#include <type_traits> // conditional
|
||||
|
||||
#ifdef _MSC_VER
|
||||
#include <cstdlib> // _byteswap_uint64
|
||||
#endif
|
||||
|
||||
// SSE2 (every x86-64 CPU) and NEON (every 64-bit Arm CPU) convert the 16
|
||||
// digits of a double at once
|
||||
#if defined(__x86_64__) || (defined(_M_X64) && !defined(_M_ARM64EC))
|
||||
#include <emmintrin.h>
|
||||
#define JSON_DTOA_SSE2 1
|
||||
#define JSON_DTOA_NEON 0
|
||||
#elif (defined(__aarch64__) || defined(_M_ARM64)) && !defined(_M_ARM64EC) && !defined(__ARM_BIG_ENDIAN)
|
||||
#include <arm_neon.h>
|
||||
#define JSON_DTOA_SSE2 0
|
||||
#define JSON_DTOA_NEON 1
|
||||
#else
|
||||
#define JSON_DTOA_SSE2 0
|
||||
#define JSON_DTOA_NEON 0
|
||||
#endif
|
||||
|
||||
#include <nlohmann/detail/conversions/zmij.hpp>
|
||||
#include <nlohmann/detail/macro_scope.hpp>
|
||||
|
||||
NLOHMANN_JSON_NAMESPACE_BEGIN
|
||||
@@ -939,88 +918,6 @@ void grisu2(char* buf, int& len, int& decimal_exponent, FloatType value)
|
||||
grisu2(buf, len, decimal_exponent, w.minus, w.w, w.plus);
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief the shortest digits of a positive finite float (other than double): Grisu2
|
||||
*/
|
||||
template<typename FloatType>
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
void shortest_digits(char* buf, int& len, int& decimal_exponent, FloatType value)
|
||||
{
|
||||
grisu2(buf, len, decimal_exponent, value);
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief the shortest digits of a positive finite double: the conversion of
|
||||
Zmij (see zmij.hpp), which always finds the shortest digits that read back as
|
||||
the same value (Grisu2 does not for about one double in a thousand), and the
|
||||
closest of them if there are several
|
||||
|
||||
v = buf * 10^decimal_exponent, as for grisu2()
|
||||
*/
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
inline void shortest_digits(char* buf, int& len, int& decimal_exponent, double value)
|
||||
{
|
||||
static_assert(std::numeric_limits<double>::is_iec559 && std::numeric_limits<double>::digits == 53,
|
||||
"internal error: the conversion of Zmij needs IEEE 754 binary64 doubles");
|
||||
JSON_ASSERT(std::isfinite(value));
|
||||
JSON_ASSERT(value > 0);
|
||||
|
||||
std::uint64_t bits = 0;
|
||||
std::memcpy(&bits, &value, sizeof(bits));
|
||||
zmij::decimal d = zmij::to_decimal(bits);
|
||||
// without trailing zeros (up to 16): 8, 4, 2, 1 at a time
|
||||
while (d.significand % 100000000 == 0)
|
||||
{
|
||||
d.significand /= 100000000;
|
||||
d.exponent += 8;
|
||||
}
|
||||
if (d.significand % 10000 == 0)
|
||||
{
|
||||
d.significand /= 10000;
|
||||
d.exponent += 4;
|
||||
}
|
||||
if (d.significand % 100 == 0)
|
||||
{
|
||||
d.significand /= 100;
|
||||
d.exponent += 2;
|
||||
}
|
||||
if (d.significand % 10 == 0)
|
||||
{
|
||||
d.significand /= 10;
|
||||
d.exponent += 1;
|
||||
}
|
||||
// at most 17 digits, written from the back two at a time
|
||||
static constexpr const char* pairs =
|
||||
"00010203040506070809101112131415161718192021222324252627282930313233343536373839"
|
||||
"40414243444546474849505152535455565758596061626364656667686970717273747576777879"
|
||||
"8081828384858687888990919293949596979899";
|
||||
std::array<char, 20> digits{};
|
||||
std::size_t n = digits.size();
|
||||
while (d.significand >= 100)
|
||||
{
|
||||
const std::uint64_t two_digits = d.significand % 100; // a variable: GCC calls a cast of the remainder useless where std::uint64_t is std::size_t
|
||||
const auto i = static_cast<std::size_t>(two_digits) * 2;
|
||||
d.significand /= 100;
|
||||
n -= 2;
|
||||
digits[n] = pairs[i];
|
||||
digits[n + 1] = pairs[i + 1];
|
||||
}
|
||||
if (d.significand >= 10)
|
||||
{
|
||||
const auto i = static_cast<std::size_t>(d.significand) * 2;
|
||||
n -= 2;
|
||||
digits[n] = pairs[i];
|
||||
digits[n + 1] = pairs[i + 1];
|
||||
}
|
||||
else
|
||||
{
|
||||
digits[--n] = static_cast<char>('0' + d.significand);
|
||||
}
|
||||
len = static_cast<int>(digits.size() - n);
|
||||
std::memcpy(buf, digits.data() + n, static_cast<std::size_t>(len));
|
||||
decimal_exponent = d.exponent;
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief appends a decimal representation of e to buf
|
||||
@return a pointer to the element following the exponent.
|
||||
@@ -1150,374 +1047,6 @@ inline char* format_buffer(char* buf, int len, int decimal_exponent,
|
||||
return append_exponent(buf, n - 1);
|
||||
}
|
||||
|
||||
/// eight decimal digits (a value below 10^8) as bytes 0..9, the first digit
|
||||
/// in the most significant byte: three steps that divide all lanes at once
|
||||
/// by a multiplication (the conversion of Xiang JunBo, as in Zmij)
|
||||
inline std::uint64_t eight_digit_bytes(std::uint64_t abcdefgh) noexcept
|
||||
{
|
||||
const std::uint64_t abcd_efgh = abcdefgh + (((std::uint64_t{1} << 32u) - 10000u) * ((abcdefgh * (((std::uint64_t{1} << 40u) / 10000u) + 1u)) >> 40u));
|
||||
const std::uint64_t ab_cd_ef_gh = abcd_efgh + (((std::uint64_t{1} << 16u) - 100u) * (((abcd_efgh * (((std::uint64_t{1} << 19u) / 100u) + 1u)) >> 19u) & 0x7F0000007Fu));
|
||||
return ab_cd_ef_gh + (((std::uint64_t{1} << 8u) - 10u) * (((ab_cd_ef_gh * (((std::uint64_t{1} << 10u) / 10u) + 1u)) >> 10u) & 0x000F000F000F000Fu));
|
||||
}
|
||||
|
||||
/// store the bytes of v, the most significant one first (one byte swap and
|
||||
/// one store where the byte order is known: compilers do not reliably merge
|
||||
/// the byte stores once this is inlined)
|
||||
inline void store_msb_first(char* p, std::uint64_t v) noexcept
|
||||
{
|
||||
#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
|
||||
v = __builtin_bswap64(v);
|
||||
std::memcpy(p, &v, sizeof(v));
|
||||
#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
|
||||
std::memcpy(p, &v, sizeof(v));
|
||||
#elif defined(_MSC_VER) // (little-endian on all its targets)
|
||||
v = _byteswap_uint64(v);
|
||||
std::memcpy(p, &v, sizeof(v));
|
||||
#else
|
||||
for (unsigned i = 0; i < 8; ++i)
|
||||
{
|
||||
p[i] = static_cast<char>(v >> (56u - (8u * i)));
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief digits * 10^exp for a double, in the layout of format_buffer()
|
||||
|
||||
The layout is that of format_buffer() with min_exp -4 and max_exp 15 (the
|
||||
digits10 of double). The digits are converted eight at a time and placed
|
||||
with fixed-size moves instead of per-digit loops and moves of the buffer.
|
||||
|
||||
@param[in] digits the digits (not 0, at most 17 digits; trailing zeros allowed)
|
||||
@param[in] exp the decimal exponent of the last digit
|
||||
@return a pointer past the text; up to 41 bytes at @a first are written
|
||||
(some beyond the returned end)
|
||||
*/
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
inline char* write_decimal(char* first, std::uint64_t digits, int exp) noexcept
|
||||
{
|
||||
JSON_ASSERT(digits != 0 && digits < 100000000000000000u);
|
||||
const std::uint64_t upper = digits / 100000000u;
|
||||
const std::uint64_t b0 = upper / 100000000u; // (one digit: it is its own byte)
|
||||
const std::uint64_t b1 = eight_digit_bytes(upper % 100000000u);
|
||||
const std::uint64_t b2 = eight_digit_bytes(digits % 100000000u);
|
||||
// leading and trailing zero digits: zero bytes, counted without division
|
||||
int leading = 16;
|
||||
int zeros = 16;
|
||||
if (b0 != 0)
|
||||
{
|
||||
leading = count_leading_zeros(b0) / 8;
|
||||
}
|
||||
else if (b1 != 0)
|
||||
{
|
||||
leading = 8 + (count_leading_zeros(b1) / 8);
|
||||
}
|
||||
else
|
||||
{
|
||||
leading += count_leading_zeros(b2) / 8;
|
||||
}
|
||||
if (b2 != 0)
|
||||
{
|
||||
zeros = count_trailing_zeros(b2) / 8;
|
||||
}
|
||||
else if (b1 != 0)
|
||||
{
|
||||
zeros = 8 + (count_trailing_zeros(b1) / 8);
|
||||
}
|
||||
// (else: 16, b0 is the one digit that is not 0)
|
||||
// the digits as text at text + leading, then '0's, so that fixed-size
|
||||
// moves need not check how many digits there are
|
||||
std::array<char, 64> text; // NOLINT(cppcoreguidelines-pro-type-member-init,hicpp-member-init): written before read
|
||||
store_msb_first(text.data(), b0 + 0x3030303030303030u);
|
||||
store_msb_first(text.data() + 8, b1 + 0x3030303030303030u);
|
||||
store_msb_first(text.data() + 16, b2 + 0x3030303030303030u);
|
||||
std::memset(text.data() + 24, '0', 40);
|
||||
const int k = 24 - leading - zeros; // significant digits
|
||||
const int n = k + exp + zeros; // position of the decimal point after the first digit
|
||||
const char* const s0 = text.data() + leading;
|
||||
|
||||
if (-4 < n && n <= 15)
|
||||
{
|
||||
// "0.[000]digits" (n <= 0) is the digits after 1 - n leading '0's
|
||||
// with the point after the first; "digits[000].0" (n >= k) and
|
||||
// "dig.its" put the point after n characters
|
||||
const int pad = n <= 0 ? 1 - n : 0;
|
||||
const char* const s = s0 - pad;
|
||||
const int len = k + pad;
|
||||
const int point = n + pad;
|
||||
std::memcpy(first, s, 16);
|
||||
std::memcpy(first + point + 1, s + point, 24);
|
||||
first[point] = '.';
|
||||
return first + (point >= len ? point + 2 : len + 1);
|
||||
}
|
||||
|
||||
// d.igitse+XX, with at least two exponent digits (as append_exponent())
|
||||
std::memcpy(first, s0, 16);
|
||||
std::memcpy(first + 2, s0 + 1, 16);
|
||||
first[1] = '.';
|
||||
char* const end = first + (k == 1 ? 1 : k + 1);
|
||||
const int e = n - 1;
|
||||
const auto ea = static_cast<unsigned>(e < 0 ? -e : e);
|
||||
const bool three = ea >= 100;
|
||||
end[0] = 'e';
|
||||
end[1] = e < 0 ? '-' : '+';
|
||||
end[2] = static_cast<char>('0' + (three ? ea / 100 : (ea / 10) % 10));
|
||||
end[3] = static_cast<char>('0' + (three ? (ea / 10) % 10 : ea % 10));
|
||||
end[4] = static_cast<char>('0' + (ea % 10));
|
||||
return end + (three ? 5 : 4);
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief the shortest decimal of a positive double (Zmij), as write_decimal()
|
||||
writes it
|
||||
|
||||
For a normal double, the shorter candidate has 15 or 16 digits: they are
|
||||
converted at once (two halves of eight digits) and followed by the digit
|
||||
after them, if there is one, without the multiplication and division by 10
|
||||
that counting the digits of one number would take. The fixed layouts move
|
||||
the digits after the point by one byte.
|
||||
|
||||
@return a pointer past the text; up to 41 bytes at @a first are written
|
||||
(some beyond the returned end)
|
||||
*/
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
inline char* write_shortest(char* first, const zmij::shortest_decimal d) noexcept
|
||||
{
|
||||
const std::uint64_t sig = d.integral;
|
||||
if (JSON_HEDLEY_UNLIKELY(sig < 100000000000000u || sig >= 10000000000000000u))
|
||||
{
|
||||
// (subnormals)
|
||||
return d.has_digit ? write_decimal(first, (sig * 10) + d.digit, d.exponent) : write_decimal(first, sig, d.exponent + 1);
|
||||
}
|
||||
const bool sixteen = sig >= 1000000000000000u; // (else 15 digits)
|
||||
const int last = d.has_digit ? d.digit : 0;
|
||||
const std::uint64_t upper = sig / 100000000u;
|
||||
#if JSON_DTOA_SSE2
|
||||
// NOLINTBEGIN(portability-simd-intrinsics)
|
||||
// the two halves in the 64-bit lanes, each as abcd * 2^32 + efgh, then as
|
||||
// bytes (as eight_digit_bytes(), one lane each)
|
||||
const __m128i x = _mm_set_epi64x(static_cast<long long>(sig - (upper * 100000000u)), static_cast<long long>(upper));
|
||||
const __m128i abcd = _mm_srli_epi64(_mm_mul_epu32(x, _mm_set1_epi64x(109951163)), 40); // 2^40 / 10000 + 1
|
||||
const __m128i abcd_efgh = _mm_add_epi64(x, _mm_mul_epu32(abcd, _mm_set1_epi64x(4294957296))); // 2^32 - 10000
|
||||
// 32-bit lanes in the order of the text: abcd, efgh of both halves
|
||||
const __m128i fours = _mm_shuffle_epi32(abcd_efgh, _MM_SHUFFLE(2, 3, 0, 1));
|
||||
const __m128i ab = _mm_srli_epi16(_mm_mulhi_epu16(fours, _mm_set1_epi32(5243)), 3);
|
||||
const __m128i ab_cd = _mm_or_si128(_mm_slli_epi32(_mm_sub_epi16(fours, _mm_mullo_epi16(ab, _mm_set1_epi32(100))), 16), ab);
|
||||
// 16-bit lanes ab (< 100) -> bytes a, b: 256 * ab - 2559 * (ab / 10)
|
||||
const __m128i bytes = _mm_sub_epi16(_mm_slli_epi16(ab_cd, 8), _mm_mullo_epi16(_mm_set1_epi16(2559), _mm_mulhi_epu16(ab_cd, _mm_set1_epi16(6554))));
|
||||
// the last digit that is not 0 (sig is not 0)
|
||||
const auto nonzero = static_cast<std::uint64_t>(_mm_movemask_epi8(_mm_cmpgt_epi8(bytes, _mm_setzero_si128())));
|
||||
const int digits = 63 - count_leading_zeros(nonzero) + (sixteen ? 1 : 0); // without trailing zeros
|
||||
const __m128i chars = _mm_add_epi8(bytes, _mm_set1_epi8('0'));
|
||||
// the 16 characters from the first digit
|
||||
const __m128i s = sixteen ? chars : _mm_or_si128(_mm_srli_si128(chars, 1), _mm_slli_si128(_mm_cvtsi32_si128('0' + last), 15));
|
||||
const char s16 = static_cast<char>(sixteen ? '0' + last : '0'); // the 17th
|
||||
const auto store_16 = [&s](char* p) noexcept
|
||||
{
|
||||
std::memcpy(p, &s, 16);
|
||||
};
|
||||
const char first_digit = static_cast<char>(_mm_cvtsi128_si32(s));
|
||||
// NOLINTEND(portability-simd-intrinsics)
|
||||
#elif JSON_DTOA_NEON
|
||||
// as with SSE2: the halves in 32-bit lanes, then abcd, efgh of both
|
||||
const uint32x2_t halves = vcreate_u32(upper | ((sig - (upper * 100000000u)) << 32u));
|
||||
const uint32x2_t abcd = vmovn_u64(vshrq_n_u64(vmull_n_u32(halves, static_cast<std::uint32_t>(((std::uint64_t{1} << 40u) / 10000u) + 1u)), 40));
|
||||
const uint32x2_t efgh = vmls_n_u32(halves, abcd, 10000u);
|
||||
const uint32x4_t fours = vcombine_u32(vzip1_u32(abcd, efgh), vzip2_u32(abcd, efgh));
|
||||
const uint32x4_t ab = vshrq_n_u32(vmulq_n_u32(fours, 5243u), 19);
|
||||
const uint16x8_t ab_cd = vreinterpretq_u16_u32(vorrq_u32(ab, vshlq_n_u32(vmlsq_n_u32(fours, ab, 100u), 16)));
|
||||
const uint16x8_t tens = vshrq_n_u16(vmulq_n_u16(ab_cd, 103u), 10);
|
||||
const uint8x16_t bytes = vreinterpretq_u8_u16(vorrq_u16(tens, vshlq_n_u16(vmlsq_n_u16(ab_cd, tens, 10u), 8)));
|
||||
// the last digit that is not 0 (sig is not 0): a nibble per byte
|
||||
const std::uint64_t nonzero = vget_lane_u64(vreinterpret_u64_u8(vshrn_n_u16(vreinterpretq_u16_u8(vtstq_u8(bytes, bytes)), 4)), 0);
|
||||
const int digits = ((63 - count_leading_zeros(nonzero)) / 4) + (sixteen ? 1 : 0); // without trailing zeros
|
||||
const uint8x16_t chars = vaddq_u8(bytes, vdupq_n_u8('0'));
|
||||
// the 16 characters from the first digit
|
||||
const uint8x16_t s = sixteen ? chars : vextq_u8(chars, vdupq_n_u8(static_cast<std::uint8_t>('0' + last)), 1);
|
||||
const char s16 = static_cast<char>(sixteen ? '0' + last : '0'); // the 17th
|
||||
const auto store_16 = [&s](char* p) noexcept
|
||||
{
|
||||
vst1q_u8(reinterpret_cast<std::uint8_t*>(p), s); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
||||
};
|
||||
const auto first_digit = static_cast<char>(vgetq_lane_u8(s, 0));
|
||||
#else
|
||||
const std::uint64_t hi = eight_digit_bytes(upper);
|
||||
const std::uint64_t lo = eight_digit_bytes(sig - (upper * 100000000u));
|
||||
// trailing zero digits: zero bytes (sig is not 0)
|
||||
const int zeros = lo != 0 ? count_trailing_zeros(lo) / 8 : 8 + (count_trailing_zeros(hi) / 8);
|
||||
const int digits = 15 - zeros + (sixteen ? 1 : 0); // without trailing zeros
|
||||
// the 16 characters from the first digit
|
||||
const std::uint64_t s_hi = (sixteen ? hi : (hi << 8u) | (lo >> 56u)) + 0x3030303030303030u;
|
||||
const std::uint64_t s_lo = (sixteen ? lo : (lo << 8u) | static_cast<std::uint64_t>(last)) + 0x3030303030303030u;
|
||||
const char s16 = static_cast<char>(sixteen ? '0' + last : '0'); // the 17th
|
||||
const auto store_16 = [s_hi, s_lo](char* p) noexcept
|
||||
{
|
||||
store_msb_first(p, s_hi);
|
||||
store_msb_first(p + 8, s_lo);
|
||||
};
|
||||
const auto first_digit = static_cast<char>(s_hi >> 56u);
|
||||
#endif
|
||||
const int len = d.has_digit ? 16 + (sixteen ? 1 : 0) : digits; // significant digits
|
||||
const int n = 16 + (sixteen ? 1 : 0) + d.exponent; // digits before the point
|
||||
|
||||
if (JSON_HEDLEY_LIKELY(n >= 1 && n <= 15))
|
||||
{
|
||||
// "dig.its" and "digits[000].0": the digits after the point move by
|
||||
// one byte ('0's follow the digits)
|
||||
#if JSON_DTOA_SSE2
|
||||
// NOLINTBEGIN(portability-simd-intrinsics)
|
||||
// (in the register: reading the digits back from memory right after
|
||||
// storing them waits until the stores are done)
|
||||
const __m128i at = _mm_set1_epi8(static_cast<char>(n));
|
||||
const __m128i index = _mm_setr_epi8(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
|
||||
const __m128i before = _mm_cmpgt_epi8(at, index);
|
||||
const __m128i after = _mm_cmpgt_epi8(index, at);
|
||||
const __m128i text = _mm_or_si128(_mm_or_si128(_mm_and_si128(s, before), _mm_and_si128(_mm_slli_si128(s, 1), after)),
|
||||
_mm_andnot_si128(_mm_or_si128(before, after), _mm_set1_epi8('.')));
|
||||
std::memcpy(first, &text, 16);
|
||||
first[16] = static_cast<char>(_mm_extract_epi16(s, 7) >> 8);
|
||||
first[17] = s16;
|
||||
// NOLINTEND(portability-simd-intrinsics)
|
||||
#elif JSON_DTOA_NEON
|
||||
const uint8x16_t index = vcombine_u8(vcreate_u8(0x0706050403020100u), vcreate_u8(0x0F0E0D0C0B0A0908u));
|
||||
const uint8x16_t at = vdupq_n_u8(static_cast<std::uint8_t>(n));
|
||||
const uint8x16_t after_point = vbslq_u8(vcgtq_u8(index, at), vextq_u8(vdupq_n_u8(0), s, 15), vdupq_n_u8('.'));
|
||||
vst1q_u8(reinterpret_cast<std::uint8_t*>(first), vbslq_u8(vcltq_u8(index, at), s, after_point)); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
||||
first[16] = static_cast<char>(vgetq_lane_u8(s, 15));
|
||||
first[17] = s16;
|
||||
#else
|
||||
store_16(first);
|
||||
first[16] = s16;
|
||||
std::uint64_t after_point[2]; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays,cppcoreguidelines-pro-type-member-init,hicpp-member-init): written before read
|
||||
std::memcpy(after_point, first + n, 16);
|
||||
std::memcpy(first + n + 1, after_point, 16);
|
||||
first[n] = '.';
|
||||
#endif
|
||||
return first + (n >= len ? n + 2 : len + 1);
|
||||
}
|
||||
if (n <= 0 && n > -4)
|
||||
{
|
||||
// "0.[000]digits"
|
||||
std::memset(first, '0', 8);
|
||||
first[1] = '.';
|
||||
store_16(first + 2 - n);
|
||||
first[18 - n] = s16;
|
||||
return first + 2 - n + len;
|
||||
}
|
||||
// d.igitse+XX, with at least two exponent digits (as append_exponent())
|
||||
store_16(first + 1);
|
||||
first[17] = s16;
|
||||
first[0] = first_digit;
|
||||
first[1] = '.';
|
||||
char* const end = first + (len == 1 ? 1 : len + 1);
|
||||
const int e = n - 1;
|
||||
const auto ea = static_cast<unsigned>(e < 0 ? -e : e);
|
||||
const bool three = ea >= 100;
|
||||
end[0] = 'e';
|
||||
end[1] = e < 0 ? '-' : '+';
|
||||
end[2] = static_cast<char>('0' + (three ? ea / 100 : (ea / 10) % 10));
|
||||
end[3] = static_cast<char>('0' + (three ? (ea / 10) % 10 : ea % 10));
|
||||
end[4] = static_cast<char>('0' + (ea % 10));
|
||||
return end + (three ? 5 : 4);
|
||||
}
|
||||
|
||||
/// the powers of ten up to 10^16
|
||||
inline const std::array<std::uint64_t, 17>& powers_of_ten_16() noexcept
|
||||
{
|
||||
static const std::array<std::uint64_t, 17> powers =
|
||||
{
|
||||
{
|
||||
1u, 10u, 100u, 1000u, 10000u, 100000u, 1000000u, 10000000u, 100000000u, 1000000000u, 10000000000u,
|
||||
100000000000u, 1000000000000u, 10000000000000u, 100000000000000u, 1000000000000000u, 10000000000000000u
|
||||
}
|
||||
};
|
||||
return powers;
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief digits * 10^exp, as write_decimal() writes it, for the digits of a
|
||||
double that need no conversion (count digits, at most 15, the first not 0;
|
||||
trailing zeros allowed): extended to 16 digits and written by write_shortest()
|
||||
|
||||
@return a pointer past the text; up to 41 bytes at @a first are written
|
||||
(some beyond the returned end)
|
||||
*/
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
inline char* write_short_decimal(char* first, std::uint64_t digits, int count, int exp) noexcept
|
||||
{
|
||||
JSON_ASSERT(digits >= powers_of_ten_16()[static_cast<std::size_t>(count - 1)] && count <= 15);
|
||||
const int scale = 16 - count;
|
||||
return write_shortest(first, zmij::shortest_decimal{digits * powers_of_ten_16()[static_cast<std::size_t>(scale)], exp - scale - 1, 0, false});
|
||||
}
|
||||
|
||||
/// as write_short_decimal(), counting the digits (not 0, less than 10^15)
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
inline char* write_short_decimal(char* first, std::uint64_t digits, int exp) noexcept
|
||||
{
|
||||
JSON_ASSERT(digits != 0 && digits < 1000000000000000u);
|
||||
// floor(log10(2^bits)) + 1 digits, or one less
|
||||
const int log2_bound = ((64 - count_leading_zeros(digits)) * 1233) >> 12;
|
||||
const int count = log2_bound + (digits >= powers_of_ten_16()[static_cast<std::size_t>(log2_bound)] ? 1 : 0);
|
||||
return write_short_decimal(first, digits, count, exp);
|
||||
}
|
||||
|
||||
/// a positive finite float (other than double): Grisu2 and format_buffer()
|
||||
template<typename FloatType>
|
||||
JSON_HEDLEY_NON_NULL(1, 2)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
char* write_positive(char* first, const char* last, FloatType value)
|
||||
{
|
||||
JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10);
|
||||
|
||||
// Compute v = buffer * 10^decimal_exponent.
|
||||
// The decimal digits are stored in the buffer, which needs to be interpreted
|
||||
// as an unsigned decimal integer.
|
||||
// len is the length of the buffer, i.e., the number of decimal digits.
|
||||
int len = 0;
|
||||
int decimal_exponent = 0;
|
||||
shortest_digits(first, len, decimal_exponent, value);
|
||||
|
||||
JSON_ASSERT(len <= std::numeric_limits<FloatType>::max_digits10);
|
||||
|
||||
// Format the buffer like printf("%.*g", prec, value)
|
||||
constexpr int kMinExp = -4;
|
||||
// Use digits10 here to increase compatibility with version 2.
|
||||
constexpr int kMaxExp = std::numeric_limits<FloatType>::digits10;
|
||||
|
||||
JSON_ASSERT(last - first >= kMaxExp + 2);
|
||||
JSON_ASSERT(last - first >= 2 + (-kMinExp - 1) + std::numeric_limits<FloatType>::max_digits10);
|
||||
JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10 + 6);
|
||||
|
||||
return format_buffer(first, len, decimal_exponent, kMinExp, kMaxExp);
|
||||
}
|
||||
|
||||
/// a positive finite double: the shortest digits (Zmij), laid out by
|
||||
/// write_shortest() (through a local buffer if [first, last) is shorter than
|
||||
/// the 41 bytes it may write)
|
||||
JSON_HEDLEY_NON_NULL(1, 2)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
inline char* write_positive(char* first, const char* last, double value)
|
||||
{
|
||||
static_assert(std::numeric_limits<double>::is_iec559 && std::numeric_limits<double>::digits == 53,
|
||||
"internal error: the conversion of Zmij needs IEEE 754 binary64 doubles");
|
||||
std::uint64_t bits = 0;
|
||||
std::memcpy(&bits, &value, sizeof(bits));
|
||||
const zmij::shortest_decimal d = zmij::to_shortest(bits);
|
||||
if (JSON_HEDLEY_LIKELY(last - first >= 41))
|
||||
{
|
||||
return write_shortest(first, d);
|
||||
}
|
||||
std::array<char, 64> buf; // NOLINT(cppcoreguidelines-pro-type-member-init,hicpp-member-init): written before read
|
||||
const auto len = static_cast<std::size_t>(write_shortest(buf.data(), d) - buf.data());
|
||||
JSON_ASSERT(static_cast<std::size_t>(last - first) >= len);
|
||||
std::memcpy(first, buf.data(), len);
|
||||
return first + len;
|
||||
}
|
||||
|
||||
} // namespace dtoa_impl
|
||||
|
||||
/*!
|
||||
@@ -1535,6 +1064,7 @@ JSON_HEDLEY_NON_NULL(1, 2)
|
||||
JSON_HEDLEY_RETURNS_NON_NULL
|
||||
char* to_chars(char* first, const char* last, FloatType value)
|
||||
{
|
||||
static_cast<void>(last); // maybe unused - fix warning
|
||||
JSON_ASSERT(std::isfinite(value));
|
||||
|
||||
// Use signbit(value) instead of (value < 0) since signbit works for -0.
|
||||
@@ -1560,7 +1090,28 @@ char* to_chars(char* first, const char* last, FloatType value)
|
||||
JSON_HEDLEY_DIAGNOSTIC_POP
|
||||
#endif
|
||||
|
||||
return dtoa_impl::write_positive(first, last, value);
|
||||
JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10);
|
||||
|
||||
// Compute v = buffer * 10^decimal_exponent.
|
||||
// The decimal digits are stored in the buffer, which needs to be interpreted
|
||||
// as an unsigned decimal integer.
|
||||
// len is the length of the buffer, i.e., the number of decimal digits.
|
||||
int len = 0;
|
||||
int decimal_exponent = 0;
|
||||
dtoa_impl::grisu2(first, len, decimal_exponent, value);
|
||||
|
||||
JSON_ASSERT(len <= std::numeric_limits<FloatType>::max_digits10);
|
||||
|
||||
// Format the buffer like printf("%.*g", prec, value)
|
||||
constexpr int kMinExp = -4;
|
||||
// Use digits10 here to increase compatibility with version 2.
|
||||
constexpr int kMaxExp = std::numeric_limits<FloatType>::digits10;
|
||||
|
||||
JSON_ASSERT(last - first >= kMaxExp + 2);
|
||||
JSON_ASSERT(last - first >= 2 + (-kMinExp - 1) + std::numeric_limits<FloatType>::max_digits10);
|
||||
JSON_ASSERT(last - first >= std::numeric_limits<FloatType>::max_digits10 + 6);
|
||||
|
||||
return dtoa_impl::format_buffer(first, len, decimal_exponent, kMinExp, kMaxExp);
|
||||
}
|
||||
|
||||
} // namespace detail
|
||||
|
||||
@@ -1,238 +0,0 @@
|
||||
// __ _____ _____ _____
|
||||
// __| | __| | | | JSON for Modern C++
|
||||
// | | |__ | | | | | | version 3.12.0
|
||||
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
|
||||
//
|
||||
// SPDX-FileCopyrightText: 2025 Victor Zverovich <https://github.com/vitaut/zmij>
|
||||
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
|
||||
// SPDX-License-Identifier: MIT
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <array> // array
|
||||
#include <cstddef> // size_t
|
||||
#include <cstdint> // uint32_t, uint64_t
|
||||
|
||||
#include <nlohmann/detail/abi_macros.hpp>
|
||||
#include <nlohmann/detail/bit_ops.hpp>
|
||||
#include <nlohmann/detail/input/pow5_table.hpp>
|
||||
#include <nlohmann/detail/macro_scope.hpp>
|
||||
|
||||
NLOHMANN_JSON_NAMESPACE_BEGIN
|
||||
namespace detail
|
||||
{
|
||||
|
||||
/*!
|
||||
@brief the shortest decimal representation of a double
|
||||
|
||||
A C++11 port of the conversion of Zmij by Victor Zverovich
|
||||
(https://github.com/vitaut/zmij, MIT license): the shortest decimal in the
|
||||
rounding interval of a double, the closest one if there are several. Zmij
|
||||
credits Xiang JunBo (producing the shorter candidate without a division) and
|
||||
Dougall Johnson (the compressed powers of ten). The powers of ten are taken
|
||||
from the table for number parsing (pow5_table.hpp) where it holds them, and
|
||||
computed from the compressed tables of Zmij beyond it.
|
||||
*/
|
||||
namespace zmij
|
||||
{
|
||||
|
||||
/// significand * 10^exponent
|
||||
struct decimal
|
||||
{
|
||||
std::uint64_t significand;
|
||||
int exponent;
|
||||
};
|
||||
|
||||
/// the compressed powers of ten of Zmij
|
||||
inline const std::array<std::uint64_t, 28>& pow10_minor() noexcept
|
||||
{
|
||||
static const std::array<std::uint64_t, 28> table =
|
||||
{
|
||||
{
|
||||
0x8000000000000000u, 0xa000000000000000u, 0xc800000000000000u, 0xfa00000000000000u, 0x9c40000000000000u,
|
||||
0xc350000000000000u, 0xf424000000000000u, 0x9896800000000000u, 0xbebc200000000000u, 0xee6b280000000000u,
|
||||
0x9502f90000000000u, 0xba43b74000000000u, 0xe8d4a51000000000u, 0x9184e72a00000000u, 0xb5e620f480000000u,
|
||||
0xe35fa931a0000000u, 0x8e1bc9bf04000000u, 0xb1a2bc2ec5000000u, 0xde0b6b3a76400000u, 0x8ac7230489e80000u,
|
||||
0xad78ebc5ac620000u, 0xd8d726b7177a8000u, 0x878678326eac9000u, 0xa968163f0a57b400u, 0xd3c21bcecceda100u,
|
||||
0x84595161401484a0u, 0xa56fa5b99019a5c8u, 0xcecb8f27f4200f3au
|
||||
}
|
||||
};
|
||||
return table;
|
||||
}
|
||||
|
||||
/// (high, low) pairs
|
||||
inline const std::array<std::uint64_t, 50>& pow10_major() noexcept
|
||||
{
|
||||
static const std::array<std::uint64_t, 50> table =
|
||||
{
|
||||
{
|
||||
0xaddcb9e83c6b1793u, 0xdf4abe242a1bbf3eu, 0xaf8e5410288e1b6fu, 0x07ecf0ae5ee44ddau, 0xb1442798f49ffb4au, 0x99cd11cfdf41779du,
|
||||
0xb2fe3f0b8599ef07u, 0x861fa7e6dcb4aa15u, 0xb4bca50b065abe63u, 0x0fed077a756b53aau, 0xb67f6455292cbf08u, 0x1a3bc84c17b1d543u,
|
||||
0xb84687c269ef3bfbu, 0x3d5d514f40eea742u, 0xba121a4650e4ddebu, 0x92f34d62616ce413u, 0xbbe226efb628afeau, 0x890489f70a55368cu,
|
||||
0xbdb6b8e905cb600fu, 0x5400e987bbc1c921u, 0xbf8fdb78849a5f96u, 0xde98520472bdd034u, 0xc16d9a0095928a27u, 0x75b7053c0f178294u,
|
||||
0xc350000000000000u, 0x0000000000000000u, 0xc5371912364ce305u, 0x6c28000000000000u, 0xc722f0ef9d80aad6u, 0x424d3ad2b7b97ef6u,
|
||||
0xc913936dd571c84cu, 0x03bc3a19cd1e38eau, 0xcb090c8001ab551cu, 0x5cadf5bfd3072cc6u, 0xcd036837130890a1u, 0x36dba887c37a8c10u,
|
||||
0xcf02b2c21207ef2eu, 0x94f967e45e03f4bcu, 0xd106f86e69d785c7u, 0xe13336d701beba52u, 0xd31045a8341ca07cu, 0x1ede48111209a051u,
|
||||
0xd51ea6fa85785631u, 0x552a74227f3ea566u, 0xd732290fbacaf133u, 0xa97c177947ad4096u, 0xd94ad8b1c7380874u, 0x18375281ae7822bdu,
|
||||
0xdb68c2ca82ed2a05u, 0xa67398db9f6820e1u
|
||||
}
|
||||
};
|
||||
return table;
|
||||
}
|
||||
|
||||
/// one bit per power: whether the computed value is one unit too large
|
||||
inline const std::array<std::uint32_t, 21>& pow10_fixups() noexcept
|
||||
{
|
||||
static const std::array<std::uint32_t, 21> table =
|
||||
{
|
||||
{
|
||||
0x8d8fc810u, 0x06100293u, 0x19000000u, 0x00100000u, 0x00000908u, 0x00000000u, 0x04e00300u, 0x3807e0b2u, 0x3d83d793u, 0x0006f5ccu,
|
||||
0x00000000u, 0xffff0000u, 0x8076337du, 0x4ff45ba0u, 0x09405033u, 0x034376d9u, 0x09000000u, 0x4e100501u, 0x076d14dcu, 0xf964f45eu,
|
||||
0x0000003du
|
||||
}
|
||||
};
|
||||
return table;
|
||||
}
|
||||
|
||||
/// the 128-bit significand of 10^k, rounded down, for k in [-307, 341]
|
||||
/// (compute_pow10 of Zmij)
|
||||
inline uint128_parts compute_pow10(int k) noexcept
|
||||
{
|
||||
const auto i = static_cast<unsigned>(k + 307);
|
||||
const std::uint64_t m = pow10_minor()[(i + 24) % 28];
|
||||
const std::size_t j = 2 * static_cast<std::size_t>((i + 24) / 28);
|
||||
const std::uint64_t h_hi = pow10_major()[j];
|
||||
const std::uint64_t h_lo = pow10_major()[j + 1];
|
||||
const std::uint64_t h1 = full_multiplication(h_lo, m).high;
|
||||
const std::uint64_t c0 = h_lo * m;
|
||||
const std::uint64_t c1 = h1 + (h_hi * m);
|
||||
const std::uint64_t c2 = (c1 < h1 ? 1u : 0u) + full_multiplication(h_hi, m).high;
|
||||
uint128_parts r{};
|
||||
if ((c2 >> 63u) != 0)
|
||||
{
|
||||
r.high = c2;
|
||||
r.low = c1;
|
||||
}
|
||||
else
|
||||
{
|
||||
r.high = (c2 << 1u) | (c1 >> 63u);
|
||||
r.low = (c1 << 1u) | (c0 >> 63u);
|
||||
}
|
||||
r.low -= (pow10_fixups()[i >> 5u] >> (i & 31u)) & 1u;
|
||||
return r;
|
||||
}
|
||||
|
||||
/// The 128-bit significand of 10^k, rounded down, for k in [-342, 341].
|
||||
/// Up to 10^308, the table for number parsing holds the same significands
|
||||
/// (those of 5^k), except for k in [-27, -1], where it holds them one unit
|
||||
/// larger (as the Eisel-Lemire algorithm needs them).
|
||||
inline uint128_parts pow10(int k) noexcept
|
||||
{
|
||||
if (k > pow5_128_largest_power)
|
||||
{
|
||||
return compute_pow10(k); // (only for the smallest doubles)
|
||||
}
|
||||
const auto i = 2 * static_cast<std::size_t>(k - pow5_128_smallest_power);
|
||||
uint128_parts r{pow5_128()[i + 1], pow5_128()[i]};
|
||||
const std::uint64_t adjust = static_cast<unsigned>(k + 27) < 27u ? 1u : 0u;
|
||||
r.high -= r.low < adjust ? 1u : 0u;
|
||||
r.low -= adjust;
|
||||
return r;
|
||||
}
|
||||
|
||||
/// (x_hi * 2^64 + x_lo) * y >> 64, as 128 bits
|
||||
inline uint128_parts umul192_hi128(std::uint64_t x_hi, std::uint64_t x_lo, std::uint64_t y) noexcept
|
||||
{
|
||||
const uint128_parts p = full_multiplication(x_hi, y);
|
||||
uint128_parts r{};
|
||||
r.low = p.low + full_multiplication(x_lo, y).high;
|
||||
r.high = p.high + (r.low < p.low ? 1u : 0u);
|
||||
return r;
|
||||
}
|
||||
|
||||
/// (x * y + c) >> 64
|
||||
inline std::uint64_t umul128_add_hi64(std::uint64_t x, std::uint64_t y, std::uint64_t c) noexcept
|
||||
{
|
||||
const uint128_parts p = full_multiplication(x, y);
|
||||
return p.high + (p.low + c < p.low ? 1u : 0u);
|
||||
}
|
||||
|
||||
/// the result of Zmij: the shorter candidate and, if that is outside the
|
||||
/// rounding interval, the digit after it (16 bytes: returned in registers)
|
||||
struct shortest_decimal
|
||||
{
|
||||
std::uint64_t integral; ///< the shorter candidate (15 or 16 digits for normal doubles)
|
||||
int exponent; ///< the decimal exponent of the digit after it
|
||||
unsigned char digit; ///< the digit after it (if has_digit)
|
||||
bool has_digit; ///< whether the shortest decimal is integral * 10 + digit
|
||||
};
|
||||
|
||||
/// The shortest decimal in the rounding interval of a positive finite double
|
||||
/// given by its bits, the closest one if there are several (to_decimal of
|
||||
/// Zmij, which keeps the last digit apart: the 15 or 16 digits before it can be
|
||||
/// converted without a multiplication by 10 first). Always inlined: GCC
|
||||
/// otherwise calls it, and its result goes through memory.
|
||||
JSON_HEDLEY_ALWAYS_INLINE shortest_decimal to_shortest(std::uint64_t bits) noexcept
|
||||
{
|
||||
constexpr int extra_shift = 9;
|
||||
const auto raw_exp = static_cast<int>((bits >> 52u) & 0x7FFu);
|
||||
std::uint64_t bin_sig = bits & ((std::uint64_t{1} << 52u) - 1);
|
||||
// a power of two has a narrower interval below (except the smallest normal)
|
||||
const bool regular = bin_sig != 0 || raw_exp <= 1;
|
||||
const int bin_exp = (raw_exp == 0 ? 1 : raw_exp) - 1075;
|
||||
if (raw_exp != 0)
|
||||
{
|
||||
bin_sig |= std::uint64_t{1} << 52u;
|
||||
}
|
||||
// floor(log10(2^bin_exp)), or floor(log10(3/4 * 2^bin_exp)) for the irregular case
|
||||
const int dec_exp = ((bin_exp * 315653) - (regular ? 0 : 131072)) >> 20;
|
||||
// scaled by 10^(-dec_exp - 1): the integral part is the shorter candidate
|
||||
const int shift = bin_exp + ((-(dec_exp + 1) * 217707) >> 16) + 1 + extra_shift;
|
||||
const uint128_parts p10 = pow10(-dec_exp - 1);
|
||||
const uint128_parts p = umul192_hi128(p10.high, p10.low, bin_sig << static_cast<unsigned>(shift));
|
||||
std::uint64_t integral = p.high >> static_cast<unsigned>(extra_shift);
|
||||
const std::uint64_t fractional = (p.high << static_cast<unsigned>(64 - extra_shift)) | (p.low >> static_cast<unsigned>(extra_shift));
|
||||
std::uint64_t digit = 0;
|
||||
bool round_up = false;
|
||||
bool round_down = false;
|
||||
if (JSON_HEDLEY_LIKELY(regular))
|
||||
{
|
||||
const std::uint64_t half_ulp = (p10.high >> static_cast<unsigned>(extra_shift + 1 - shift)) + (1 - (bin_sig & 1u));
|
||||
round_up = fractional + half_ulp < fractional;
|
||||
round_down = half_ulp > fractional;
|
||||
// the last digit of the longer candidate, rounded to nearest
|
||||
digit = umul128_add_hi64(fractional, 10, (std::uint64_t{1} << 63u) + 6);
|
||||
if (fractional == (std::uint64_t{1} << 62u))
|
||||
{
|
||||
digit = 2; // 2.5 rounds to 2
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
const std::uint64_t half_ulp = p10.high >> static_cast<unsigned>(extra_shift + 1 - shift);
|
||||
round_up = half_ulp > ~std::uint64_t{0} - fractional;
|
||||
round_down = (half_ulp >> 1u) > fractional;
|
||||
digit = umul128_add_hi64(fractional, 10, (std::uint64_t{1} << 63u) - 1);
|
||||
const std::uint64_t lowest = umul128_add_hi64(fractional - (half_ulp >> 1u), 10, ~std::uint64_t{0});
|
||||
digit = digit < lowest ? lowest : digit;
|
||||
}
|
||||
integral += round_up ? 1u : 0u;
|
||||
// if the shorter candidate is outside the rounding interval: one digit more
|
||||
return shortest_decimal{integral, dec_exp, static_cast<unsigned char>(digit), !round_up && !round_down};
|
||||
}
|
||||
|
||||
/// The shortest decimal in the rounding interval of a positive finite double
|
||||
/// given by its bits, as one number. The significand can end in zeros.
|
||||
inline decimal to_decimal(std::uint64_t bits) noexcept
|
||||
{
|
||||
const shortest_decimal d = to_shortest(bits);
|
||||
if (d.has_digit)
|
||||
{
|
||||
return decimal{(d.integral * 10) + d.digit, d.exponent};
|
||||
}
|
||||
return decimal{d.integral, d.exponent + 1};
|
||||
}
|
||||
|
||||
} // namespace zmij
|
||||
} // namespace detail
|
||||
NLOHMANN_JSON_NAMESPACE_END
|
||||
@@ -221,44 +221,6 @@ class lexer : public lexer_base<BasicJsonType>
|
||||
// scan functions
|
||||
/////////////////////
|
||||
|
||||
/// contiguous input: try to decode the 4 hex digits following `\\u`
|
||||
/// directly from the input buffer via hex_codepoint(), instead of 4 calls
|
||||
/// to get(). On success, advances the adapter and the position counters
|
||||
/// exactly as those 4 get() calls would (a hex digit is never '\n', so
|
||||
/// only the flat counters move) and leaves @a current holding the last of
|
||||
/// the 4 digits, just as the last such get() would; the codepoint is
|
||||
/// written to @a out. Makes no state change and returns false - for a
|
||||
/// pending unget, fewer than 4 remaining bytes, or any of the 4 bytes not
|
||||
/// being a hex digit - so the caller falls back unchanged to the
|
||||
/// per-character loop, which then reports the same diagnostic (stopping
|
||||
/// at the first invalid digit) as before this optimization.
|
||||
bool get_codepoint_bulk(std::true_type /*bulk*/, int& out)
|
||||
{
|
||||
if (next_unget || ia.bulk_remaining() < 4)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
const char_type* const raw = ia.bulk_data();
|
||||
const int codepoint = hex_codepoint(reinterpret_cast<const unsigned char*>(raw));
|
||||
if (codepoint < 0)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
ia.bulk_skip(4);
|
||||
// a hex digit is never a newline, so only the flat counters advance
|
||||
position.chars_read_total += 4;
|
||||
position.chars_read_current_line += 4;
|
||||
current = char_traits<char_type>::to_int_type(raw[3]);
|
||||
out = codepoint;
|
||||
return true;
|
||||
}
|
||||
|
||||
/// streaming input: no bulk fast path
|
||||
bool get_codepoint_bulk(std::false_type /*bulk*/, int& /*out*/) const noexcept
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief get codepoint from 4 hex characters following `\\u`
|
||||
|
||||
@@ -278,14 +240,6 @@ class lexer : public lexer_base<BasicJsonType>
|
||||
{
|
||||
// this function only makes sense after reading `\u`
|
||||
JSON_ASSERT(current == 'u');
|
||||
|
||||
// contiguous input: decode all 4 hex digits directly from the buffer
|
||||
int fast_codepoint = 0;
|
||||
if (get_codepoint_bulk(std::integral_constant<bool, bulk_scan> {}, fast_codepoint))
|
||||
{
|
||||
return fast_codepoint;
|
||||
}
|
||||
|
||||
int codepoint = 0;
|
||||
|
||||
const auto factors = { 12u, 8u, 4u, 0u };
|
||||
@@ -1090,11 +1044,9 @@ class lexer : public lexer_base<BasicJsonType>
|
||||
token_type::parse_error otherwise
|
||||
|
||||
@note The scanner is independent of the current locale: token_buffer
|
||||
always holds `.`. The conversion of float and double does not use
|
||||
the locale either. Only the std::strtold fallback of
|
||||
convert_number() for long double formats other than binary64
|
||||
depends on it, and it looks up the decimal point right before
|
||||
converting (see detail::convert_float_locale_aware()).
|
||||
always holds `.`. Only the std::strtod fallback of convert_number()
|
||||
depends on the locale, and it looks up the decimal point right
|
||||
before converting (see detail::convert_float_locale_aware()).
|
||||
*/
|
||||
token_type scan_number() // lgtm [cpp/use-of-goto] `goto` is used in this function to implement the number-parsing state machine described above. By design, any finite input will eventually reach the "done" state or return token_type::parse_error. In each intermediate state, 1 byte of the input is appended to the token_buffer vector, and only the already initialized variables token_buffer, number_type, and error_message are manipulated.
|
||||
{
|
||||
@@ -1107,7 +1059,7 @@ class lexer : public lexer_base<BasicJsonType>
|
||||
|
||||
// offset just past the last mantissa byte in token_buffer (i.e. the
|
||||
// index of 'e'/'E', or the whole token when there is no exponent).
|
||||
// convert_number() uses it to split the token; npos means
|
||||
// convert_number() uses it to count significant digits; npos means
|
||||
// "not seen an exponent yet" and is resolved at scan_number_done
|
||||
std::size_t mantissa_end = std::string::npos;
|
||||
|
||||
@@ -1437,8 +1389,8 @@ scan_number_done:
|
||||
@param[in] mantissa_end offset just past the last mantissa byte in
|
||||
token_buffer (the index of 'e'/'E', or
|
||||
token_buffer.size() when there is no exponent);
|
||||
with decimal_point_position, it locates the parts
|
||||
of a float token without scanning it again
|
||||
used to skip Clinger's fast path when it cannot
|
||||
possibly succeed - see detail::mantissa_fits_clinger()
|
||||
*/
|
||||
token_type convert_number(token_type number_type, std::size_t mantissa_end)
|
||||
{
|
||||
@@ -1492,11 +1444,10 @@ scan_number_done:
|
||||
}
|
||||
|
||||
// this code is reached if we parse a floating-point number or if an
|
||||
// integer conversion above overflowed. float and double (and long
|
||||
// double where it is binary64) are converted by the library itself,
|
||||
// correctly rounded and independent of the locale; other long double
|
||||
// formats use std::from_chars when available, otherwise the
|
||||
// locale-aware strtold.
|
||||
// integer conversion above overflowed. Prefer std::from_chars
|
||||
// (Eisel-Lemire, locale-independent, correctly rounded) when available;
|
||||
// otherwise the exact Clinger fast path (double only); otherwise the
|
||||
// locale-aware strtof/strtod/strtold.
|
||||
if (convert_float_fast(num_begin, num_end, decimal_point_position, mantissa_end, value_float))
|
||||
{
|
||||
return token_type::value_float;
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
@@ -8,12 +8,10 @@
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <array> // array
|
||||
#include <cstddef> // size_t
|
||||
#include <cstdint> // uint64_t, uint8_t
|
||||
#include <cstdint> // uint64_t
|
||||
#include <cstring> // memcpy
|
||||
|
||||
#include <nlohmann/detail/bit_ops.hpp>
|
||||
#include <nlohmann/detail/macro_scope.hpp>
|
||||
|
||||
// Optional SIMD backend for bulk UTF-8 validation. This is an opt-in external
|
||||
@@ -71,12 +69,18 @@ inline std::size_t find_string_special(const unsigned char* data, std::size_t n)
|
||||
std::size_t i = 0;
|
||||
for (; i + 8 <= n; i += 8)
|
||||
{
|
||||
const std::uint64_t special = swar_string_special(read_eight_bytes(data + i));
|
||||
if (special != 0)
|
||||
std::uint64_t word = 0;
|
||||
std::memcpy(&word, data + i, sizeof(word));
|
||||
if (swar_string_special(word) != 0)
|
||||
{
|
||||
// the lowest flagged byte is the first special one: the borrows of
|
||||
// the subtractions can only flag bytes above a true hit
|
||||
return i + (static_cast<std::size_t>(count_trailing_zeros(special)) / 8);
|
||||
// a special byte is in this word; locate it (endian-agnostic)
|
||||
for (std::size_t j = 0; j < 8; ++j)
|
||||
{
|
||||
if (is_string_special(data[i + j]))
|
||||
{
|
||||
return i + j;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
for (; i < n; ++i)
|
||||
@@ -110,7 +114,8 @@ inline std::size_t find_ascii_copyable_run(const unsigned char* data, std::size_
|
||||
std::size_t i = 0;
|
||||
for (; i + 8 <= n; i += 8)
|
||||
{
|
||||
const std::uint64_t v = read_eight_bytes(data + i);
|
||||
std::uint64_t v = 0;
|
||||
std::memcpy(&v, data + i, sizeof(v));
|
||||
const std::uint64_t q = v ^ 0x2222222222222222ull; // '"' (0x22)
|
||||
const std::uint64_t b = v ^ 0x5C5C5C5C5C5C5C5Cull; // '\\' (0x5C)
|
||||
const std::uint64_t d = v ^ 0x7F7F7F7F7F7F7F7Full; // DEL (0x7F)
|
||||
@@ -121,9 +126,7 @@ inline std::size_t find_ascii_copyable_run(const unsigned char* data, std::size_
|
||||
| (v & high); // >= 0x80
|
||||
if (stop != 0)
|
||||
{
|
||||
// the lowest flagged byte is the first one to stop at (see
|
||||
// find_string_special())
|
||||
return i + (static_cast<std::size_t>(count_trailing_zeros(stop)) / 8);
|
||||
break;
|
||||
}
|
||||
}
|
||||
for (; i < n; ++i)
|
||||
@@ -250,18 +253,12 @@ inline std::size_t scalar_string_bulk_run(const unsigned char* data, std::size_t
|
||||
{
|
||||
break; // end of buffer, or a quote/escape/control byte
|
||||
}
|
||||
// a run of multi-byte sequences (e.g. CJK text) is validated sequence
|
||||
// by sequence without searching for the next special byte in between
|
||||
do
|
||||
const std::size_t seq = validate_one_utf8(data + pos, n - pos);
|
||||
if (seq == 0)
|
||||
{
|
||||
const std::size_t seq = validate_one_utf8(data + pos, n - pos);
|
||||
if (seq == 0)
|
||||
{
|
||||
return pos; // ill-formed or truncated: let the byte path diagnose it
|
||||
}
|
||||
pos += seq;
|
||||
break; // ill-formed or truncated: let the byte path diagnose it
|
||||
}
|
||||
while (pos < n && data[pos] >= 0x80u);
|
||||
pos += seq;
|
||||
}
|
||||
return pos;
|
||||
}
|
||||
@@ -276,7 +273,8 @@ inline std::size_t find_string_delimiter(const unsigned char* data, std::size_t
|
||||
std::size_t i = 0;
|
||||
for (; i + 8 <= n; i += 8)
|
||||
{
|
||||
const std::uint64_t v = read_eight_bytes(data + i);
|
||||
std::uint64_t v = 0;
|
||||
std::memcpy(&v, data + i, sizeof(v));
|
||||
const std::uint64_t q = v ^ 0x2222222222222222ull;
|
||||
const std::uint64_t b = v ^ 0x5C5C5C5C5C5C5C5Cull;
|
||||
const std::uint64_t hit = ((q - ones) & ~q & high)
|
||||
@@ -284,8 +282,14 @@ inline std::size_t find_string_delimiter(const unsigned char* data, std::size_t
|
||||
| ((v - 0x2020202020202020ull) & ~v & high);
|
||||
if (hit != 0)
|
||||
{
|
||||
// the lowest flagged byte is the first delimiter (see find_string_special())
|
||||
return i + (static_cast<std::size_t>(count_trailing_zeros(hit)) / 8);
|
||||
for (std::size_t j = 0; j < 8; ++j)
|
||||
{
|
||||
const unsigned char c = data[i + j];
|
||||
if (c == '\"' || c == '\\' || c < 0x20u)
|
||||
{
|
||||
return i + j;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
for (; i < n; ++i)
|
||||
@@ -316,50 +320,5 @@ inline std::size_t string_bulk_run(const unsigned char* data, std::size_t n) noe
|
||||
return scalar_string_bulk_run(data, n);
|
||||
}
|
||||
|
||||
// Decode the 4 hex digits at [data, data+4) - the digits following a `\u`
|
||||
// escape - into a codepoint 0x0000..0xFFFF via one table lookup per byte
|
||||
// (after yyjson's read_hex_u16), or return -1 if any of the 4 bytes is not a
|
||||
// hex digit ('0'..'9', 'A'..'F', 'a'..'f'). The caller must already have
|
||||
// checked that 4 bytes are available; used by lexer::get_codepoint()'s
|
||||
// contiguous fast path. On -1 it falls back to the byte-at-a-time loop, which
|
||||
// stops at the first invalid digit, so the reported error and position are
|
||||
// unaffected by this fast path.
|
||||
inline int hex_codepoint(const unsigned char* data) noexcept
|
||||
{
|
||||
static const std::array<std::uint8_t, 256> hex_digit_table = // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
|
||||
{
|
||||
{
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 00..0F
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 10..1F
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 20..2F
|
||||
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 30..3F ('0'..'9')
|
||||
0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 40..4F ('A'..'F')
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 50..5F
|
||||
0xFF, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 60..6F ('a'..'f')
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 70..7F
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 80..8F
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // 90..9F
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // A0..AF
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // B0..BF
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // C0..CF
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // D0..DF
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // E0..EF
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF // F0..FF
|
||||
}
|
||||
};
|
||||
|
||||
const std::uint8_t d0 = hex_digit_table[data[0]];
|
||||
const std::uint8_t d1 = hex_digit_table[data[1]];
|
||||
const std::uint8_t d2 = hex_digit_table[data[2]];
|
||||
const std::uint8_t d3 = hex_digit_table[data[3]];
|
||||
// every valid digit is <= 0xF; the combined OR only exceeds it if at
|
||||
// least one of the four bytes was not a hex digit (looked up as 0xFF)
|
||||
if ((d0 | d1 | d2 | d3) > 0x0F)
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
return (d0 << 12) | (d1 << 8) | (d2 << 4) | d3;
|
||||
}
|
||||
|
||||
} // namespace detail
|
||||
NLOHMANN_JSON_NAMESPACE_END
|
||||
|
||||
@@ -21,8 +21,6 @@
|
||||
#undef JSON_NO_UNIQUE_ADDRESS
|
||||
#undef JSON_DISABLE_ENUM_SERIALIZATION
|
||||
#undef JSON_DISABLE_TUPLE_REFERENCE_CONVERSION
|
||||
#undef JSON_DTOA_SSE2
|
||||
#undef JSON_DTOA_NEON
|
||||
|
||||
#ifndef JSON_TEST_KEEP_MACROS
|
||||
#undef JSON_CATCH
|
||||
|
||||
@@ -1366,9 +1366,8 @@ class serializer
|
||||
/*!
|
||||
@brief dump an integer
|
||||
|
||||
Dump a given integer, appending it to @ref write_buffer (directly: copying
|
||||
the digits from another buffer right after writing them waits until the
|
||||
stores are done).
|
||||
Dump a given integer, appending it to @ref write_buffer. Works internally with
|
||||
@a number_buffer.
|
||||
|
||||
@param[in] x integer number (signed or unsigned) to dump
|
||||
@tparam NumberType either @a number_integer_t or @a number_unsigned_t
|
||||
@@ -1403,57 +1402,33 @@ class serializer
|
||||
return;
|
||||
}
|
||||
|
||||
// use a pointer to fill the buffer (room for as much as number_buffer holds)
|
||||
if (JSON_HEDLEY_UNLIKELY(write_buffer_pos + number_buffer.size() > write_buffer.size()))
|
||||
{
|
||||
flush();
|
||||
}
|
||||
auto* buffer_ptr = write_buffer.data() + write_buffer_pos;
|
||||
// use a pointer to fill the buffer
|
||||
auto buffer_ptr = number_buffer.begin(); // NOLINT(llvm-qualified-auto,readability-qualified-auto)
|
||||
|
||||
number_unsigned_t abs_value;
|
||||
|
||||
// one byte for the minus sign
|
||||
unsigned int n_chars = 0;
|
||||
unsigned int n_chars{};
|
||||
|
||||
if (is_negative_number(x))
|
||||
{
|
||||
*buffer_ptr = '-';
|
||||
abs_value = remove_sign(static_cast<number_integer_t>(x));
|
||||
n_chars = 1;
|
||||
|
||||
// account one more byte for the minus sign
|
||||
n_chars = 1 + count_digits(abs_value);
|
||||
}
|
||||
else
|
||||
{
|
||||
abs_value = static_cast<number_unsigned_t>(x);
|
||||
n_chars = count_digits(abs_value);
|
||||
}
|
||||
|
||||
// up to 16 digits: eight at a time (as the digits of floats), written
|
||||
// without leading zeros
|
||||
if (abs_value < 10000000000000000u)
|
||||
{
|
||||
const std::uint64_t value = abs_value;
|
||||
const std::uint64_t upper = value / 100000000u;
|
||||
const std::uint64_t first = dtoa_impl::eight_digit_bytes(upper != 0 ? upper : value);
|
||||
const auto leading = static_cast<unsigned>(count_leading_zeros(first) / 8); // (first is not 0)
|
||||
char* const p = buffer_ptr + n_chars;
|
||||
dtoa_impl::store_msb_first(p, (first << (8 * leading)) + 0x3030303030303030u);
|
||||
n_chars += 8 - leading;
|
||||
if (upper != 0)
|
||||
{
|
||||
dtoa_impl::store_msb_first(p + 8 - leading, dtoa_impl::eight_digit_bytes(value - (upper * 100000000u)) + 0x3030303030303030u);
|
||||
n_chars += 8;
|
||||
}
|
||||
write_buffer_pos += n_chars;
|
||||
return;
|
||||
}
|
||||
|
||||
n_chars += count_digits(abs_value);
|
||||
|
||||
// spare 1 byte for '\0'
|
||||
JSON_ASSERT(n_chars < number_buffer.size() - 1);
|
||||
|
||||
// jump to the end to generate the string from backward,
|
||||
// so we later avoid reversing the result
|
||||
buffer_ptr += n_chars;
|
||||
buffer_ptr += static_cast<typename decltype(number_buffer)::difference_type>(n_chars);
|
||||
|
||||
// Fast int2ascii implementation inspired by "Fastware" talk by Andrei Alexandrescu
|
||||
// See: https://www.youtube.com/watch?v=o4-CwDo2zpg
|
||||
@@ -1476,13 +1451,14 @@ class serializer
|
||||
*(--buffer_ptr) = static_cast<char>('0' + abs_value);
|
||||
}
|
||||
|
||||
write_buffer_pos += n_chars;
|
||||
put_buffer(number_buffer, n_chars);
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief dump a floating-point number
|
||||
|
||||
Dump a given floating-point number, appending it to @ref write_buffer.
|
||||
Dump a given floating-point number, appending it to @ref write_buffer. Works internally
|
||||
with @a number_buffer.
|
||||
|
||||
@param[in] x floating-point number to dump
|
||||
*/
|
||||
@@ -1509,15 +1485,10 @@ class serializer
|
||||
|
||||
void dump_float(number_float_t x, std::true_type /*is_ieee_single_or_double*/)
|
||||
{
|
||||
// directly into the write buffer: copying the text from number_buffer
|
||||
// right after to_chars() wrote it waits until its stores are done
|
||||
if (JSON_HEDLEY_UNLIKELY(write_buffer_pos + number_buffer.size() > write_buffer.size()))
|
||||
{
|
||||
flush();
|
||||
}
|
||||
auto* begin = write_buffer.data() + write_buffer_pos;
|
||||
auto* begin = number_buffer.data();
|
||||
auto* end = ::nlohmann::detail::to_chars(begin, begin + number_buffer.size(), x);
|
||||
write_buffer_pos += static_cast<std::size_t>(end - begin);
|
||||
|
||||
put_buffer(number_buffer, static_cast<std::size_t>(end - begin));
|
||||
}
|
||||
|
||||
JSON_HEDLEY_NON_NULL(1)
|
||||
|
||||
+53
-24
@@ -638,21 +638,49 @@ private:
|
||||
}
|
||||
}
|
||||
|
||||
static basic_json& last_child(basic_json& v)
|
||||
// The walk in destroy_container() may take the children of a
|
||||
// container in any order, as long as it picks the same child again
|
||||
// while that container is not modified in between. Arrays and
|
||||
// objects with bidirectional iterators (std::map, ordered_map, ...)
|
||||
// use their last child, which a vector-based container can remove
|
||||
// in O(1). ObjectType only needs forward iterators, though (e.g.
|
||||
// std::unordered_map), so other objects use their first child.
|
||||
template<typename ObjectType_>
|
||||
static typename ObjectType_::iterator walk_child_it(ObjectType_& o, std::bidirectional_iterator_tag /*unused*/)
|
||||
{
|
||||
return std::prev(o.end());
|
||||
}
|
||||
|
||||
template<typename ObjectType_>
|
||||
static typename ObjectType_::iterator walk_child_it(ObjectType_& o, std::forward_iterator_tag /*unused*/)
|
||||
{
|
||||
return o.begin();
|
||||
}
|
||||
|
||||
template<typename ObjectType_>
|
||||
static typename ObjectType_::iterator walk_child_it(ObjectType_& o)
|
||||
{
|
||||
JSON_ASSERT(!o.empty());
|
||||
return walk_child_it(o, typename std::iterator_traits<typename ObjectType_::iterator>::iterator_category());
|
||||
}
|
||||
|
||||
// the child of a non-empty array/object v that the walk in
|
||||
// destroy_container() continues with (see walk_child_it() above)
|
||||
static basic_json& walk_child(basic_json& v)
|
||||
{
|
||||
if (v.m_data.m_type == value_t::array)
|
||||
{
|
||||
return v.m_data.m_value.array->back();
|
||||
}
|
||||
JSON_ASSERT(v.m_data.m_type == value_t::object);
|
||||
return v.m_data.m_value.object->rbegin()->second;
|
||||
return walk_child_it(*v.m_data.m_value.object)->second;
|
||||
}
|
||||
|
||||
// removes the last child of a non-empty array/object v; this never
|
||||
// removes walk_child(v) from a non-empty array/object v; this never
|
||||
// allocates, and since it is only ever called when that child is a
|
||||
// scalar or an already-empty array/object, destroying it never
|
||||
// recurses more than one level deep (see destroy() below)
|
||||
static void pop_last_child(basic_json& v)
|
||||
static void pop_walk_child(basic_json& v)
|
||||
{
|
||||
if (v.m_data.m_type == value_t::array)
|
||||
{
|
||||
@@ -661,9 +689,7 @@ private:
|
||||
else
|
||||
{
|
||||
JSON_ASSERT(v.m_data.m_type == value_t::object);
|
||||
// erase() needs a forward iterator, so std::prev(end()) is
|
||||
// used here rather than rbegin() (see last_child() above)
|
||||
v.m_data.m_value.object->erase(std::prev(v.m_data.m_value.object->end()));
|
||||
v.m_data.m_value.object->erase(walk_child_it(*v.m_data.m_value.object));
|
||||
}
|
||||
}
|
||||
|
||||
@@ -734,14 +760,17 @@ public:
|
||||
// bad_alloc, which would escape this noexcept destructor and
|
||||
// terminate the program (#5135).
|
||||
//
|
||||
// Instead, walk down the "last child" chain, reversing links
|
||||
// as we go: cur is the container currently being emptied,
|
||||
// and prev is its parent (value_t::null when there is none).
|
||||
// Each parent's last child slot doubles as storage for that
|
||||
// parent's own parent link while we are below it, so no
|
||||
// extra memory is needed. We only ever remove a child once
|
||||
// it is a scalar or an empty array/object, which neither
|
||||
// allocates nor recurses more than one level deep.
|
||||
// Instead, walk down a chain of children (always the one
|
||||
// walk_child() picks), reversing links as we go: cur is the
|
||||
// container currently being emptied, and prev is its parent
|
||||
// (value_t::null when there is none). Each parent's
|
||||
// walk_child() slot doubles as storage for that parent's own
|
||||
// parent link while we are below it, so no extra memory is
|
||||
// needed; the parent is not modified meanwhile, so
|
||||
// walk_child() finds that same slot again on the way up. We
|
||||
// only ever remove a child once it is a scalar or an empty
|
||||
// array/object, which neither allocates nor recurses more
|
||||
// than one level deep.
|
||||
//
|
||||
// This json_value is not itself a basic_json, so the
|
||||
// top-level container is first moved into a local stand-in
|
||||
@@ -767,11 +796,11 @@ public:
|
||||
}
|
||||
|
||||
// ascend: detach the grandparent link from prev's
|
||||
// last slot, drop that (now null) slot, free cur
|
||||
// walk_child() slot, drop that (now null) slot, free cur
|
||||
// (it is empty), then move up one level
|
||||
basic_json gp;
|
||||
take(gp, last_child(prev));
|
||||
pop_last_child(prev);
|
||||
take(gp, walk_child(prev));
|
||||
pop_walk_child(prev);
|
||||
|
||||
free_container(cur);
|
||||
|
||||
@@ -780,21 +809,21 @@ public:
|
||||
continue;
|
||||
}
|
||||
|
||||
basic_json& cur_last_ref = last_child(cur);
|
||||
basic_json& cur_child_ref = walk_child(cur);
|
||||
|
||||
if (has_no_children(cur_last_ref))
|
||||
if (has_no_children(cur_child_ref))
|
||||
{
|
||||
// scalar, or already-empty array/object
|
||||
pop_last_child(cur);
|
||||
pop_walk_child(cur);
|
||||
continue;
|
||||
}
|
||||
|
||||
// descend into the non-empty last child, reversing the
|
||||
// descend into the non-empty child, reversing the
|
||||
// link: its slot takes over prev, and the child becomes
|
||||
// the new cur
|
||||
basic_json tmp;
|
||||
take(tmp, cur_last_ref);
|
||||
take(cur_last_ref, prev);
|
||||
take(tmp, cur_child_ref);
|
||||
take(cur_child_ref, prev);
|
||||
take(prev, cur);
|
||||
take(cur, tmp);
|
||||
}
|
||||
|
||||
+529
-1665
File diff suppressed because it is too large
Load Diff
@@ -1,599 +0,0 @@
|
||||
// __ _____ _____ _____
|
||||
// __| | __| | | | JSON for Modern C++ (supporting code)
|
||||
// | | |__ | | | | | | version 3.12.0
|
||||
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
|
||||
//
|
||||
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
|
||||
// SPDX-License-Identifier: MIT
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <array> // array
|
||||
#include <cstdint> // uint32_t, uint64_t
|
||||
|
||||
// Number tokens that are hard to round correctly, with the IEEE-754 binary64
|
||||
// and binary32 bits of their correctly rounded values (ties to even; infinity
|
||||
// for an overflow, a signed zero for an underflow).
|
||||
//
|
||||
// For doubles and floats around 0, the smallest normal number, 1, 2^24, 2^53,
|
||||
// 0.1, and the largest finite number, and for random ones, the exact midpoint
|
||||
// m to the next number gives: m, m with one unit more and less in the last
|
||||
// digit, m with "01" and "0...01" appended, m with trailing zeros, and m cut
|
||||
// after 17 to 30 digits (rounded down and up, so that the rounding is decided
|
||||
// after the 19th digit), in fixed and exponent notation, 30% of them negative.
|
||||
// Tokens longer than 80 characters are left out, except for four of 700 digits
|
||||
// and more. Zeros, underflow, overflow, huge exponents, and integers beyond 64
|
||||
// bits complete the set. Of the 508 tokens, 134 (as double) and 150 (as
|
||||
// float) need the exact comparison with the midpoint (detail::digit_comparison()).
|
||||
//
|
||||
// The expected bits were computed with exact rational arithmetic in Python
|
||||
// (fractions.Fraction) and cross-checked with Python's float(); strtod_l and
|
||||
// strtof_l of Apple's libc and of glibc agree. Generated by
|
||||
// compact_hard_cases.py 5 (with hard_cases.py), see the pull request that
|
||||
// added this file.
|
||||
|
||||
namespace float_hard_cases
|
||||
{
|
||||
|
||||
struct hard_case
|
||||
{
|
||||
const char* token;
|
||||
std::uint64_t bits64;
|
||||
std::uint32_t bits32;
|
||||
};
|
||||
|
||||
inline const std::array<hard_case, 508>& cases()
|
||||
{
|
||||
static const std::array<hard_case, 508> table =
|
||||
{
|
||||
{
|
||||
{"-2.4703282292062327e-324", 0x8000000000000000u, 0x80000000u},
|
||||
{"24703282292062328e-340", 0x0000000000000001u, 0x00000000u},
|
||||
{"247032822920623272e-341", 0x0000000000000000u, 0x00000000u},
|
||||
{"-0.2470328229206232721e-323", 0x8000000000000001u, 0x80000000u},
|
||||
{"-0.24703282292062327208e-323", 0x8000000000000000u, 0x80000000u},
|
||||
{"-2.4703282292062327209e-324", 0x8000000000000001u, 0x80000000u},
|
||||
{"2.47032822920623272088e-324", 0x0000000000000000u, 0x00000000u},
|
||||
{"247032822920623272089e-344", 0x0000000000000001u, 0x00000000u},
|
||||
{"-247032822920623272088284396434e-353", 0x8000000000000000u, 0x80000000u},
|
||||
{"0.247032822920623272088284396435e-323", 0x0000000000000001u, 0x00000000u},
|
||||
{"-74109846876186981e-340", 0x8000000000000001u, 0x80000000u},
|
||||
{"0.74109846876186982e-323", 0x0000000000000002u, 0x00000000u},
|
||||
{"-0.7410984687618698162e-323", 0x8000000000000001u, 0x80000000u},
|
||||
{"-7.410984687618698163e-324", 0x8000000000000002u, 0x80000000u},
|
||||
{"7.4109846876186981626e-324", 0x0000000000000001u, 0x00000000u},
|
||||
{"-74109846876186981627e-343", 0x8000000000000002u, 0x80000000u},
|
||||
{"-741098468761869816264e-344", 0x8000000000000001u, 0x80000000u},
|
||||
{"0.741098468761869816265e-323", 0x0000000000000002u, 0x00000000u},
|
||||
{"0.741098468761869816264853189302e-323", 0x0000000000000001u, 0x00000000u},
|
||||
{"-7.41098468761869816264853189303e-324", 0x8000000000000002u, 0x80000000u},
|
||||
{"0.22250738585072006e-307", 0x000FFFFFFFFFFFFEu, 0x00000000u},
|
||||
{"2.2250738585072007e-308", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"2.225073858507200641e-308", 0x000FFFFFFFFFFFFEu, 0x00000000u},
|
||||
{"-2225073858507200642e-326", 0x800FFFFFFFFFFFFFu, 0x80000000u},
|
||||
{"22250738585072006419e-327", 0x000FFFFFFFFFFFFEu, 0x00000000u},
|
||||
{"0.2225073858507200642e-307", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"0.222507385850720064199e-307", 0x000FFFFFFFFFFFFEu, 0x00000000u},
|
||||
{"2.225073858507200642e-308", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"-2.22507385850720064199176395546e-308", 0x800FFFFFFFFFFFFEu, 0x80000000u},
|
||||
{"222507385850720064199176395547e-337", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"-2.2250738585072011e-308", 0x800FFFFFFFFFFFFFu, 0x80000000u},
|
||||
{"-22250738585072012e-324", 0x8010000000000000u, 0x80000000u},
|
||||
{"-2225073858507201136e-326", 0x800FFFFFFFFFFFFFu, 0x80000000u},
|
||||
{"0.2225073858507201137e-307", 0x0010000000000000u, 0x00000000u},
|
||||
{"0.2225073858507201136e-307", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"-2.2250738585072011361e-308", 0x8010000000000000u, 0x80000000u},
|
||||
{"2.22507385850720113605e-308", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"222507385850720113606e-328", 0x0010000000000000u, 0x00000000u},
|
||||
{"22250738585072011360574097967e-336", 0x000FFFFFFFFFFFFFu, 0x00000000u},
|
||||
{"0.222507385850720113605740979671e-307", 0x0010000000000000u, 0x00000000u},
|
||||
{"22250738585072016e-324", 0x0010000000000000u, 0x00000000u},
|
||||
{"0.22250738585072017e-307", 0x0010000000000001u, 0x00000000u},
|
||||
{"0.222507385850720163e-307", 0x0010000000000000u, 0x00000000u},
|
||||
{"2.225073858507201631e-308", 0x0010000000000001u, 0x00000000u},
|
||||
{"-2.2250738585072016301e-308", 0x8010000000000000u, 0x80000000u},
|
||||
{"22250738585072016302e-327", 0x0010000000000001u, 0x00000000u},
|
||||
{"-222507385850720163012e-328", 0x8010000000000000u, 0x80000000u},
|
||||
{"0.222507385850720163013e-307", 0x0010000000000001u, 0x00000000u},
|
||||
{"0.222507385850720163012305563795e-307", 0x0010000000000000u, 0x00000000u},
|
||||
{"-2.22507385850720163012305563796e-308", 0x8010000000000001u, 0x80000000u},
|
||||
{"0.17976931348623156E+309", 0x7FEFFFFFFFFFFFFEu, 0x7F800000u},
|
||||
{"1.7976931348623157e308", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"1.797693134862315608e308", 0x7FEFFFFFFFFFFFFEu, 0x7F800000u},
|
||||
{"-1797693134862315609e290", 0xFFEFFFFFFFFFFFFFu, 0xFF800000u},
|
||||
{"-17976931348623156083e289", 0xFFEFFFFFFFFFFFFEu, 0xFF800000u},
|
||||
{"-0.17976931348623156084E+309", 0xFFEFFFFFFFFFFFFFu, 0xFF800000u},
|
||||
{"0.179769313486231560835E+309", 0x7FEFFFFFFFFFFFFEu, 0x7F800000u},
|
||||
{"-1.79769313486231560836e308", 0xFFEFFFFFFFFFFFFFu, 0xFF800000u},
|
||||
{"1.79769313486231560835325876058e308", 0x7FEFFFFFFFFFFFFEu, 0x7F800000u},
|
||||
{"179769313486231560835325876059e279", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"1.7976931348623158e308", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"17976931348623159e292", 0x7FF0000000000000u, 0x7F800000u},
|
||||
{"1797693134862315807e290", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"0.1797693134862315808E+309", 0x7FF0000000000000u, 0x7F800000u},
|
||||
{"0.17976931348623158079E+309", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"-1.797693134862315808e308", 0xFFF0000000000000u, 0xFF800000u},
|
||||
{"1.79769313486231580793e308", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"179769313486231580794e288", 0x7FF0000000000000u, 0x7F800000u},
|
||||
{"179769313486231580793728971405e279", 0x7FEFFFFFFFFFFFFFu, 0x7F800000u},
|
||||
{"-0.179769313486231580793728971406E+309", 0xFFF0000000000000u, 0xFF800000u},
|
||||
{"100000000000000011102230246251565404236316680908203125e-53", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"-1.00000000000000011102230246251565404236316680908203126", 0xBFF0000000000001u, 0xBF800000u},
|
||||
{"1.00000000000000011102230246251565404236316680908203124e0", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"10000000000000001110223024625156540423631668090820312501e-55", 0x3FF0000000000001u, 0x3F800000u},
|
||||
{"1.00000000000000011102230246251565404236316680908203125000000000000000000001", 0x3FF0000000000001u, 0x3F800000u},
|
||||
{"10000000000000001e-16", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"1.0000000000000002", 0x3FF0000000000001u, 0x3F800000u},
|
||||
{"1.000000000000000111", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"1.000000000000000112e0", 0x3FF0000000000001u, 0x3F800000u},
|
||||
{"1.000000000000000111e0", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"-10000000000000001111e-19", 0xBFF0000000000001u, 0xBF800000u},
|
||||
{"-100000000000000011102e-20", 0xBFF0000000000000u, 0xBF800000u},
|
||||
{"-1.00000000000000011103", 0xBFF0000000000001u, 0xBF800000u},
|
||||
{"1.00000000000000011102230246251", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"1.00000000000000011102230246252e0", 0x3FF0000000000001u, 0x3F800000u},
|
||||
{"-0.999999999999999944488848768742172978818416595458984375", 0xBFF0000000000000u, 0xBF800000u},
|
||||
{"-9.99999999999999944488848768742172978818416595458984376e-1", 0xBFF0000000000000u, 0xBF800000u},
|
||||
{"999999999999999944488848768742172978818416595458984374e-54", 0x3FEFFFFFFFFFFFFFu, 0x3F800000u},
|
||||
{"0.99999999999999994448884876874217297881841659545898437501", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"9.99999999999999944488848768742172978818416595458984375000000000000000000001e-1", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"-0.99999999999999994", 0xBFEFFFFFFFFFFFFFu, 0xBF800000u},
|
||||
{"9.9999999999999995e-1", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"9.999999999999999444e-1", 0x3FEFFFFFFFFFFFFFu, 0x3F800000u},
|
||||
{"9999999999999999445e-19", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"99999999999999994448e-20", 0x3FEFFFFFFFFFFFFFu, 0x3F800000u},
|
||||
{"-0.99999999999999994449", 0xBFF0000000000000u, 0xBF800000u},
|
||||
{"0.999999999999999944488", 0x3FEFFFFFFFFFFFFFu, 0x3F800000u},
|
||||
{"-9.99999999999999944489e-1", 0xBFF0000000000000u, 0xBF800000u},
|
||||
{"9.99999999999999944488848768742e-1", 0x3FEFFFFFFFFFFFFFu, 0x3F800000u},
|
||||
{"999999999999999944488848768743e-30", 0x3FF0000000000000u, 0x3F800000u},
|
||||
{"-9.007199254740993e15", 0xC340000000000000u, 0xDA000000u},
|
||||
{"9007199254740994e0", 0x4340000000000001u, 0x5A000000u},
|
||||
{"9007199254740992", 0x4340000000000000u, 0x5A000000u},
|
||||
{"9.00719925474099301e15", 0x4340000000000001u, 0x5A000000u},
|
||||
{"9007199254740993000000000000000000001e-21", 0x4340000000000001u, 0x5A000000u},
|
||||
{"-9007199254740993.000000000000000000000000000000", 0xC340000000000000u, 0xDA000000u},
|
||||
{"90071992547409915e-1", 0x4340000000000000u, 0x5A000000u},
|
||||
{"-9007199254740991.6", 0xC340000000000000u, 0xDA000000u},
|
||||
{"9.0071992547409914e15", 0x433FFFFFFFFFFFFFu, 0x5A000000u},
|
||||
{"-9007199254740991501e-3", 0xC340000000000000u, 0xDA000000u},
|
||||
{"9007199254740991.5000000000000000000001", 0x4340000000000000u, 0x5A000000u},
|
||||
{"9.0071992547409915000000000000000000000000000000e15", 0x4340000000000000u, 0x5A000000u},
|
||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
"1080609940730262937128958950003583799967207254304360284078895771796150945516748243471030702609144621"
|
||||
"5722898802581825451803257070188608721131280795122334262883686223215037756666225039825343359745688844"
|
||||
"2390026549819838548794829220689472168983109969836584681402285424333066033985088644580400103493397042"
|
||||
"756718644338377048603786162277173854562306587467901408672332763671875000000000000000000001e-308", 0x0010000000000000u, 0x00000000u
|
||||
},
|
||||
{
|
||||
"0.11754942807573642917278829910357665133228589927589904276829631184250030649651730385585324256680905"
|
||||
"8189392089843750000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"00000000000000000000000000000000000000000000000000000000000000000e-37", 0x380FFFFFE0000000u, 0x00800000u
|
||||
},
|
||||
{
|
||||
"1175494280757364291727882991035766513322858992758990427682963118425003064965173038558532425668090581"
|
||||
"8939208984375000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
|
||||
"00000000000001e-751", 0x380FFFFFE0000000u, 0x00800000u
|
||||
},
|
||||
{"0", 0x0000000000000000u, 0x00000000u},
|
||||
{"-0", 0x8000000000000000u, 0x80000000u},
|
||||
{"0.0", 0x0000000000000000u, 0x00000000u},
|
||||
{"-0.0", 0x8000000000000000u, 0x80000000u},
|
||||
{"0e999999999999999999999", 0x0000000000000000u, 0x00000000u},
|
||||
{"-0.000e-99999", 0x8000000000000000u, 0x80000000u},
|
||||
{"1e-400", 0x0000000000000000u, 0x00000000u},
|
||||
{"-1e-400", 0x8000000000000000u, 0x80000000u},
|
||||
{"1e400", 0x7FF0000000000000u, 0x7F800000u},
|
||||
{"-1e400", 0xFFF0000000000000u, 0xFF800000u},
|
||||
{"1e-50", 0x358DEE7A4AD4B81Fu, 0x00000000u},
|
||||
{"-1e-50", 0xB58DEE7A4AD4B81Fu, 0x80000000u},
|
||||
{"1e39", 0x48078287F49C4A1Du, 0x7F800000u},
|
||||
{"-1e39", 0xC8078287F49C4A1Du, 0xFF800000u},
|
||||
{"1e99999999999999999999999999", 0x7FF0000000000000u, 0x7F800000u},
|
||||
{"1e-99999999999999999999999999", 0x0000000000000000u, 0x00000000u},
|
||||
{"1e0000000000000000000000000000000000000000308", 0x7FE1CCF385EBC8A0u, 0x7F800000u},
|
||||
{"123456789012345678901234567890e-30", 0x3FBF9ADD3746F65Fu, 0x3DFCD6EAu},
|
||||
{"18446744073709551615", 0x43F0000000000000u, 0x5F800000u},
|
||||
{"18446744073709551616", 0x43F0000000000000u, 0x5F800000u},
|
||||
{"-9223372036854775808", 0xC3E0000000000000u, 0xDF000000u},
|
||||
{"-9223372036854775809", 0xC3E0000000000000u, 0xDF000000u},
|
||||
}
|
||||
};
|
||||
return table;
|
||||
}
|
||||
|
||||
} // namespace float_hard_cases
|
||||
@@ -38,7 +38,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
|
||||
const auto ubjson_2_size = json::to_ubjson(j, true).size();
|
||||
const auto ubjson_3_size = json::to_ubjson(j, true, true).size();
|
||||
|
||||
CHECK(json_size == 2090234);
|
||||
CHECK(json_size == 2090303);
|
||||
CHECK(bjdata_1_size == 1112030);
|
||||
CHECK(bjdata_2_size == 1224148);
|
||||
CHECK(bjdata_3_size == 1224148);
|
||||
@@ -51,16 +51,16 @@ TEST_CASE("Binary Formats" * doctest::skip())
|
||||
CHECK(ubjson_3_size == 1169069);
|
||||
|
||||
CHECK((100.0 * double(json_size) / double(json_size)) == Approx(100.0));
|
||||
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(53.201));
|
||||
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(58.565));
|
||||
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(58.565));
|
||||
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(50.511));
|
||||
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(85.853));
|
||||
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(50.499));
|
||||
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(50.528));
|
||||
CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(53.201));
|
||||
CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(58.565));
|
||||
CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(55.930));
|
||||
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(53.199));
|
||||
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(58.563));
|
||||
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(58.563));
|
||||
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(50.509));
|
||||
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(85.849));
|
||||
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(50.497));
|
||||
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(50.526));
|
||||
CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(53.199));
|
||||
CHECK((100.0 * double(ubjson_2_size) / double(json_size)) == Approx(58.563));
|
||||
CHECK((100.0 * double(ubjson_3_size) / double(json_size)) == Approx(55.928));
|
||||
}
|
||||
|
||||
SECTION("twitter.json")
|
||||
|
||||
+106
-553
@@ -13,19 +13,15 @@
|
||||
using nlohmann::json;
|
||||
|
||||
#include <array> // array
|
||||
#include <cfloat> // FLT_EVAL_METHOD
|
||||
#include <cstdint> // uint32_t, uint64_t
|
||||
#include <cstdio> // snprintf
|
||||
#include <cstdlib> // strtod
|
||||
#include <cstring> // memcpy
|
||||
#include <map> // map
|
||||
#include <random> // mt19937
|
||||
#include <sstream> // stringstream
|
||||
#include <string> // string
|
||||
#include <utility> // pair
|
||||
#include <vector> // vector
|
||||
|
||||
#include "float_hard_cases.hpp"
|
||||
|
||||
namespace
|
||||
{
|
||||
// shortcut to scan a string literal
|
||||
@@ -261,7 +257,7 @@ TEST_CASE("lexer number fast path")
|
||||
"123456789012345678901234567890", // huge -> float
|
||||
"0.30000000000000004", "2.2250738585072014e-308", "1e308",
|
||||
// high-precision / wide-exponent values that exercise the
|
||||
// Eisel-Lemire path beyond the Clinger subset
|
||||
// std::from_chars (Eisel-Lemire) path beyond the Clinger subset
|
||||
"1.7976931348623157e308", "1.2345678901234567e-250",
|
||||
"9007199254740993", "5e-324", "1e-320"
|
||||
};
|
||||
@@ -283,18 +279,20 @@ TEST_CASE("lexer number fast path")
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("significant digits around Clinger's fast path")
|
||||
SECTION("significant-digit gate for the Clinger fast path")
|
||||
{
|
||||
// Clinger's fast path needs a significand of at most 2^53, which
|
||||
// tokens with 17 or more significant digits exceed. The conversion
|
||||
// splits the token at the positions the scanners recorded, so leading
|
||||
// zeros must not count as digits - "0.1234567890123456" has 16
|
||||
// significant digits, not 17 - and both scanners must agree.
|
||||
// Clinger's fast path needs a significand below 2^53, so it cannot
|
||||
// succeed once the mantissa has 17 or more significant digits (the
|
||||
// significand would be at least 10^16). The lexer skips the attempt
|
||||
// there. That is only allowed to save work: every value must still come
|
||||
// out bit-exactly, and both scanners must agree. In particular the gate
|
||||
// must not fire for tokens whose leading zeros merely look like extra
|
||||
// digits - "0.1234567890123456" has 16 significant digits, not 17.
|
||||
const std::vector<std::string> numbers =
|
||||
{
|
||||
"1234567890123456", // 16 significant digits
|
||||
"12345678901234567", // 17
|
||||
"123456789012345678", // 18
|
||||
"12345678901234567", // 17 -> attempt skipped
|
||||
"123456789012345678", // 18 -> attempt skipped
|
||||
"0.1234567890123456", // 16: the leading "0" is not significant
|
||||
"0.12345678901234567", // 17
|
||||
"0.00000000000000001", // 1, in a long token
|
||||
@@ -665,323 +663,46 @@ TEST_CASE("lexer string fast path")
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("lexer escape fast path")
|
||||
TEST_CASE("parse_float_fast declines what it cannot convert exactly")
|
||||
{
|
||||
// json::accept() never throws, so this section stays covered without
|
||||
// exceptions; it pins which of the cases below are valid/invalid and
|
||||
// checks the contiguous and streaming paths agree on that classification.
|
||||
SECTION("accept() parity")
|
||||
// The lexer only hands well-formed numbers to parse_float_fast, so the
|
||||
// malformed ones below can only be passed to it directly. Declining is
|
||||
// always safe: the caller then falls back to a slower, exact conversion.
|
||||
const auto fast = [](const std::string & s, double & out)
|
||||
{
|
||||
const std::vector<std::pair<std::string, bool>> cases =
|
||||
{
|
||||
{"\\u0041", true}, {"\\u00e4", true}, {"\\u00E4", true},
|
||||
{"\\uD83D\\uDE00", true},
|
||||
{"\\u12", false}, {"\\u12G4", false}, {"\\uXYZW", false},
|
||||
{"\\uD800", false}, {"\\uD800A", false}, {"\\uD800\\u0041", false},
|
||||
{"\\uDC00", false}, {"\\u", false}
|
||||
};
|
||||
|
||||
for (const auto& c : cases)
|
||||
{
|
||||
for (const std::size_t offset :
|
||||
{
|
||||
std::size_t{0}, std::size_t{9}
|
||||
})
|
||||
{
|
||||
const std::string doc = "[\"" + std::string(offset, 'a') + c.first + "\"]";
|
||||
CAPTURE(doc)
|
||||
CHECK(json::accept(doc) == c.second);
|
||||
std::stringstream ss(doc);
|
||||
CHECK(json::accept(ss) == c.second);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#if !defined(JSON_NOEXCEPTION)
|
||||
// the full outcome of parsing @a doc: the parsed value, or the exact
|
||||
// error message, so a mismatch in either is caught
|
||||
const auto outcome = [](const std::string & doc, bool streaming) -> std::string
|
||||
{
|
||||
try
|
||||
{
|
||||
if (streaming)
|
||||
{
|
||||
std::stringstream ss(doc);
|
||||
const json j = json::parse(ss);
|
||||
return j.dump();
|
||||
}
|
||||
const json j = json::parse(doc);
|
||||
return j.dump();
|
||||
}
|
||||
catch (const json::exception& e)
|
||||
{
|
||||
return {e.what()};
|
||||
}
|
||||
return nlohmann::detail::parse_float_fast(s.data(), s.data() + s.size(), out);
|
||||
};
|
||||
double out = 0;
|
||||
|
||||
SECTION("contiguous vs streaming parity")
|
||||
{
|
||||
const std::vector<std::string> escapes =
|
||||
{
|
||||
"\\u0041", // "A"
|
||||
"\\u00e4", // "ä" (lowercase hex)
|
||||
"\\u00E4", // "ä" (uppercase hex)
|
||||
"\\uD83D\\uDE00", // valid surrogate pair (an emoji)
|
||||
"\\u12", // truncated: only 2 hex digits before the closing quote
|
||||
"\\u12G4", // invalid hex digit at the 3rd position
|
||||
"\\uXYZW", // all 4 bytes invalid
|
||||
"\\uD800", // lone high surrogate, string ends right after
|
||||
"\\uD800A", // high surrogate not followed by another \u escape
|
||||
"\\uD800\\u0041", // high surrogate followed by \u, but not a low surrogate
|
||||
"\\uDC00", // lone low surrogate
|
||||
"\\u", // '\u' with nothing after (closing quote right away)
|
||||
};
|
||||
|
||||
// once at the start of the string and once past the first 8-byte SWAR
|
||||
// word of the outer string_bulk_run, so the escape is reached both
|
||||
// right after the opening quote and mid-run
|
||||
for (const auto& escape : escapes)
|
||||
{
|
||||
for (const std::size_t offset :
|
||||
{
|
||||
std::size_t{0}, std::size_t{9}
|
||||
})
|
||||
{
|
||||
const std::string doc = "[\"" + std::string(offset, 'a') + escape + "\"]";
|
||||
CAPTURE(doc)
|
||||
CHECK(outcome(doc, false) == outcome(doc, true));
|
||||
}
|
||||
|
||||
// the escape is the last thing before end of input: no closing
|
||||
// quote at all
|
||||
const std::string truncated_doc = "[\"" + escape;
|
||||
CAPTURE(truncated_doc)
|
||||
CHECK(outcome(truncated_doc, false) == outcome(truncated_doc, true));
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("truncated \\u escape at every distance from the end of input")
|
||||
{
|
||||
// ia.bulk_remaining() must correctly report fewer than 4 bytes for
|
||||
// every possible count of trailing hex-looking bytes (0, 1, 2, or 3)
|
||||
// before end of input, so the fast path declines and the byte path
|
||||
// alone reports the "must be followed by 4 hex digits" error, at the
|
||||
// same position, in every case
|
||||
for (const std::string& tail :
|
||||
{
|
||||
std::string{}, std::string("1"), std::string("12"), std::string("123")
|
||||
})
|
||||
{
|
||||
const std::string doc = "[\"\\u" + tail;
|
||||
CAPTURE(doc)
|
||||
CHECK(outcome(doc, false) == outcome(doc, true));
|
||||
CHECK(outcome(doc, false).find("must be followed by 4 hex digits") != std::string::npos);
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("invalid hex digit at every position of the 4")
|
||||
{
|
||||
// the fast path must decline for *any* invalid byte among the 4, not
|
||||
// just the first, and the byte path must then stop at exactly that
|
||||
// position - same as it always has
|
||||
for (std::size_t bad_pos = 0; bad_pos < 4; ++bad_pos)
|
||||
{
|
||||
std::string digits = "1234";
|
||||
digits[bad_pos] = 'g'; // not a hex digit
|
||||
const std::string doc = "[\"\\u" + digits + "\"]";
|
||||
CAPTURE(doc)
|
||||
CHECK(outcome(doc, false) == outcome(doc, true));
|
||||
CHECK(outcome(doc, false).find("must be followed by 4 hex digits") != std::string::npos);
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("random escapes")
|
||||
{
|
||||
// A seeded PRNG builds the 4 bytes following `\u` from a mix of hex
|
||||
// digits and non-hex bytes, at varying distances from the start of
|
||||
// the string, to compare the two scanners on many more shapes than
|
||||
// are practical to enumerate by hand.
|
||||
std::mt19937 gen(7654321); // NOLINT(cert-msc32-c,cert-msc51-cpp)
|
||||
const std::string hex_alphabet = "0123456789AaBbCcDdEeFf";
|
||||
std::uniform_int_distribution<std::size_t> pick_hex(0, hex_alphabet.size() - 1);
|
||||
std::uniform_int_distribution<int> pick_byte(1, 255); // never NUL
|
||||
std::uniform_int_distribution<int> pick_is_hex(0, 4); // 4-in-5 chance of a hex digit
|
||||
std::uniform_int_distribution<std::size_t> pick_offset(0, 12);
|
||||
|
||||
std::vector<std::string> mismatches;
|
||||
for (int iter = 0; iter < 3000; ++iter)
|
||||
{
|
||||
std::string digits;
|
||||
for (int i = 0; i < 4; ++i)
|
||||
{
|
||||
if (pick_is_hex(gen) != 0)
|
||||
{
|
||||
digits += hex_alphabet[pick_hex(gen)];
|
||||
}
|
||||
else
|
||||
{
|
||||
char c = static_cast<char>(pick_byte(gen));
|
||||
if (c == '"' || c == '\\')
|
||||
{
|
||||
// keep the string well-formed apart from the escape
|
||||
// itself, so any mismatch is attributable to the \u
|
||||
// handling and not to an unrelated quote/escape
|
||||
c = 'z';
|
||||
}
|
||||
digits += c;
|
||||
}
|
||||
}
|
||||
const std::string doc = "[\"" + std::string(pick_offset(gen), 'a') + "\\u" + digits + "\"]";
|
||||
if (outcome(doc, false) != outcome(doc, true))
|
||||
{
|
||||
mismatches.push_back(doc);
|
||||
}
|
||||
}
|
||||
CAPTURE(mismatches)
|
||||
CHECK(mismatches.empty());
|
||||
}
|
||||
#if defined(FLT_EVAL_METHOD) && FLT_EVAL_METHOD != 0
|
||||
// without true double precision, the fast path declines everything
|
||||
CHECK_FALSE(fast("1.5", out));
|
||||
#else
|
||||
CHECK(fast("1.5", out));
|
||||
CHECK(out == 1.5);
|
||||
CHECK(fast("+2.5e1", out));
|
||||
CHECK(out == 25.0);
|
||||
CHECK(fast("-25E-1", out));
|
||||
CHECK(out == -2.5);
|
||||
CHECK(fast("1e", out));
|
||||
CHECK(out == 1.0);
|
||||
#endif
|
||||
}
|
||||
|
||||
namespace
|
||||
{
|
||||
// the index of the decimal point (or npos) and of the end of the mantissa of a
|
||||
// number token, which the lexer records while scanning it
|
||||
std::pair<std::size_t, std::size_t> float_token_layout(const std::string& s)
|
||||
{
|
||||
std::size_t dot = std::string::npos;
|
||||
std::size_t mantissa_end = s.size();
|
||||
for (std::size_t i = 0; i < s.size(); ++i)
|
||||
{
|
||||
if (s[i] == '.')
|
||||
{
|
||||
dot = i;
|
||||
}
|
||||
else if (s[i] == 'e' || s[i] == 'E')
|
||||
{
|
||||
mantissa_end = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return {dot, mantissa_end};
|
||||
}
|
||||
// not a number
|
||||
CHECK_FALSE(fast("", out));
|
||||
CHECK_FALSE(fast("-", out));
|
||||
CHECK_FALSE(fast(".", out));
|
||||
CHECK_FALSE(fast("1.2.3", out));
|
||||
CHECK_FALSE(fast("1x", out));
|
||||
CHECK_FALSE(fast("1e+", out));
|
||||
CHECK_FALSE(fast("1e1x", out));
|
||||
|
||||
template<typename FloatType>
|
||||
FloatType parse_native(const std::string& s)
|
||||
{
|
||||
const auto layout = float_token_layout(s);
|
||||
return nlohmann::detail::parse_float_native<FloatType>(s.data(), s.data() + s.size(), layout.first, layout.second);
|
||||
}
|
||||
|
||||
std::uint64_t bits_of(double d)
|
||||
{
|
||||
std::uint64_t b = 0;
|
||||
std::memcpy(&b, &d, sizeof(b));
|
||||
return b;
|
||||
}
|
||||
|
||||
std::uint32_t bits_of(float f)
|
||||
{
|
||||
std::uint32_t b = 0;
|
||||
std::memcpy(&b, &f, sizeof(b));
|
||||
return b;
|
||||
}
|
||||
|
||||
std::uint64_t native_bits64(const std::string& s)
|
||||
{
|
||||
return bits_of(parse_native<double>(s));
|
||||
}
|
||||
|
||||
std::uint32_t native_bits32(const std::string& s)
|
||||
{
|
||||
return bits_of(parse_native<float>(s));
|
||||
}
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("parse_float_native rounds correctly")
|
||||
{
|
||||
SECTION("double")
|
||||
{
|
||||
CHECK(native_bits64("1.5") == 0x3FF8000000000000u);
|
||||
CHECK(native_bits64("0.1") == 0x3FB999999999999Au);
|
||||
CHECK(native_bits64("-0.0") == 0x8000000000000000u);
|
||||
CHECK(native_bits64("0e999999999999999999999") == 0u);
|
||||
// 2^53 + 1 is exactly between two doubles: ties to even, unless more digits follow
|
||||
CHECK(native_bits64("9007199254740993") == 0x4340000000000000u);
|
||||
CHECK(native_bits64("9007199254740993.0000000000000000001") == 0x4340000000000001u);
|
||||
CHECK(native_bits64("9007199254740992.9999999999999999999") == 0x4340000000000000u);
|
||||
// 1 + 2^-53 exactly (a tie), and one unit in the 55th digit around it
|
||||
CHECK(native_bits64("1.00000000000000011102230246251565404236316680908203125") == 0x3FF0000000000000u);
|
||||
CHECK(native_bits64("1.00000000000000011102230246251565404236316680908203126") == 0x3FF0000000000001u);
|
||||
CHECK(native_bits64("1.00000000000000011102230246251565404236316680908203124") == 0x3FF0000000000000u);
|
||||
// subnormal and overflow boundaries
|
||||
CHECK(native_bits64("2.4703282292062327e-324") == 0u);
|
||||
CHECK(native_bits64("2.4703282292062328e-324") == 1u);
|
||||
CHECK(native_bits64("2.2250738585072011e-308") == 0x000FFFFFFFFFFFFFu);
|
||||
CHECK(native_bits64("2.2250738585072012e-308") == 0x0010000000000000u);
|
||||
CHECK(native_bits64("1.7976931348623157e308") == 0x7FEFFFFFFFFFFFFFu);
|
||||
CHECK(native_bits64("1.7976931348623159e308") == 0x7FF0000000000000u);
|
||||
CHECK(native_bits64("-1e400") == 0xFFF0000000000000u);
|
||||
CHECK(native_bits64("-1e-400") == 0x8000000000000000u);
|
||||
// exponents and zeros far beyond the range cancel out
|
||||
CHECK(native_bits64("0." + std::string(1000, '0') + "1e1001") == 0x3FF0000000000000u);
|
||||
CHECK(native_bits64("1" + std::string(1000, '0') + "e-1000") == 0x3FF0000000000000u);
|
||||
CHECK(native_bits64("1e-99999999999999999999999") == 0u);
|
||||
CHECK(native_bits64("1E+99999999999999999999999") == 0x7FF0000000000000u);
|
||||
// more digits than any midpoint has (769): only whether a nonzero digit follows matters
|
||||
const std::string tie = "1.00000000000000011102230246251565404236316680908203125";
|
||||
CHECK(native_bits64(tie + std::string(800, '0')) == 0x3FF0000000000000u);
|
||||
CHECK(native_bits64(tie + std::string(800, '0') + "1") == 0x3FF0000000000001u);
|
||||
}
|
||||
|
||||
SECTION("float")
|
||||
{
|
||||
CHECK(native_bits32("1.5") == 0x3FC00000u);
|
||||
CHECK(native_bits32("0.1") == 0x3DCCCCCDu);
|
||||
CHECK(native_bits32("-0.0") == 0x80000000u);
|
||||
// 2^24 + 1 is exactly between two floats
|
||||
CHECK(native_bits32("16777217") == 0x4B800000u);
|
||||
CHECK(native_bits32("16777217.000000000000000000001") == 0x4B800001u);
|
||||
CHECK(native_bits32("16777218.999999999999999999999") == 0x4B800001u);
|
||||
CHECK(native_bits32("16777219") == 0x4B800002u);
|
||||
// subnormal and overflow boundaries
|
||||
CHECK(native_bits32("3.4028235677973366e38") == 0x7F7FFFFFu);
|
||||
CHECK(native_bits32("3.4028235677973367e38") == 0x7F800000u);
|
||||
CHECK(native_bits32("7.006492321624085e-46") == 0u);
|
||||
CHECK(native_bits32("7.006492321624086e-46") == 1u);
|
||||
CHECK(native_bits32("1.1754942e-38") == 0x007FFFFFu);
|
||||
CHECK(native_bits32("-1.17549435e-38") == 0x80800000u);
|
||||
CHECK(native_bits32("1e39") == 0x7F800000u);
|
||||
CHECK(native_bits32("-1e-50") == 0x80000000u);
|
||||
// not rounded through double: its double would round to another float
|
||||
CHECK(native_bits32("1.00000005960464477539062500000000001") == 0x3F800001u);
|
||||
CHECK(native_bits32("9007199254740993") == 0x5A000000u);
|
||||
}
|
||||
|
||||
SECTION("the conversion shared with other parsers")
|
||||
{
|
||||
// convert_float() gives the lexer's results, for every type
|
||||
const std::vector<std::string> tokens =
|
||||
{
|
||||
"0", "-0.0", "1.5", "0.1", "1e-400", "-2.5E+3", "123456789012345678901234567890",
|
||||
"9007199254740993.0000000000000000001", "4.9406564584124654e-324"
|
||||
};
|
||||
using float_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, float>;
|
||||
using long_double_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, long double>;
|
||||
for (const auto& t : tokens)
|
||||
{
|
||||
CAPTURE(t)
|
||||
const auto layout = float_token_layout(t);
|
||||
const char* const first = t.data();
|
||||
const char* const last = first + t.size();
|
||||
const auto d = nlohmann::detail::convert_float<double>(first, last, layout.first, layout.second);
|
||||
const auto f = nlohmann::detail::convert_float<float>(first, last, layout.first, layout.second);
|
||||
const auto ld = nlohmann::detail::convert_float<long double>(first, last, layout.first, layout.second);
|
||||
CHECK(bits_of(d) == bits_of(json::parse(t).get<double>()));
|
||||
CHECK(bits_of(f) == bits_of(float_json::parse(t).get<float>()));
|
||||
CHECK(ld == long_double_json::parse(t).get<long double>());
|
||||
}
|
||||
}
|
||||
// numbers that are not represented exactly on the fast path
|
||||
CHECK_FALSE(fast("12345678901234567890", out));
|
||||
CHECK_FALSE(fast("1e10000", out));
|
||||
CHECK_FALSE(fast("9007199254740993", out));
|
||||
CHECK_FALSE(fast("1e23", out));
|
||||
CHECK_FALSE(fast("1e-23", out));
|
||||
}
|
||||
|
||||
namespace
|
||||
@@ -1085,6 +806,40 @@ std::size_t big_bit_length(const big_uint& a)
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
std::uint64_t bits_of(double d)
|
||||
{
|
||||
std::uint64_t b = 0;
|
||||
std::memcpy(&b, &d, sizeof(b));
|
||||
return b;
|
||||
}
|
||||
|
||||
bool eisel_lemire(const std::string& s, double& out)
|
||||
{
|
||||
return nlohmann::detail::parse_float_eisel_lemire(s.data(), s.data() + s.size(), out);
|
||||
}
|
||||
|
||||
// significant digits of a token, without trailing zeros
|
||||
std::size_t significant_digits(const std::string& s)
|
||||
{
|
||||
std::string digits;
|
||||
for (const char c : s)
|
||||
{
|
||||
if (c == 'e' || c == 'E')
|
||||
{
|
||||
break;
|
||||
}
|
||||
if (c >= '0' && c <= '9' && !(digits.empty() && c == '0'))
|
||||
{
|
||||
digits += c;
|
||||
}
|
||||
}
|
||||
while (!digits.empty() && digits.back() == '0')
|
||||
{
|
||||
digits.pop_back();
|
||||
}
|
||||
return digits.size();
|
||||
}
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("Eisel-Lemire float conversion")
|
||||
@@ -1482,33 +1237,26 @@ TEST_CASE("Eisel-Lemire float conversion")
|
||||
for (const auto& c : known)
|
||||
{
|
||||
CAPTURE(c.first)
|
||||
CHECK(native_bits64(c.first) == c.second);
|
||||
double out = 0;
|
||||
if (eisel_lemire(c.first, out))
|
||||
{
|
||||
CHECK(bits_of(out) == c.second);
|
||||
}
|
||||
else
|
||||
{
|
||||
// only tokens with more than 19 significant digits are left to
|
||||
// strtod: those whose value lies too close to a tie
|
||||
CHECK(significant_digits(c.first) > 19);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("binary32")
|
||||
{
|
||||
using binary32 = nlohmann::detail::ieee_binary_format<24>;
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(0, 1) == 0x3F800000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-1, 1) == 0x3DCCCCCDu);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-1, 15) == 0x3FC00000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(0, 16777217) == 0x4B800000u); // tie, to even
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(0, 16777219) == 0x4B800002u); // tie, to even
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-45, 1) == 0x00000001u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-46, 7) == 0x00000000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-46, 8) == 0x00000001u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-65, 9999999999999999999u) == 0x00000000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(20, 3402823466385288598u) == 0x7F7FFFFFu);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(20, 3402823669209384635u) == 0x7F800000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(39, 1) == 0x7F800000u);
|
||||
CHECK(nlohmann::detail::eisel_lemire<binary32>(-5, 0) == 0x00000000u);
|
||||
}
|
||||
|
||||
SECTION("round trip")
|
||||
{
|
||||
// every double written by to_chars and read back, and its 17-digit
|
||||
// form with trailing digits that make the token longer than 19 digits
|
||||
// every double written by to_chars and read back, also with trailing
|
||||
// digits that make the token longer than 19 digits
|
||||
std::uint64_t state = 5295;
|
||||
std::size_t declined = 0;
|
||||
for (int i = 0; i < 200000; ++i)
|
||||
{
|
||||
state ^= state << 13u;
|
||||
@@ -1530,51 +1278,30 @@ TEST_CASE("Eisel-Lemire float conversion")
|
||||
const char* end = nlohmann::detail::to_chars(buffer.data(), buffer.data() + buffer.size(), d);
|
||||
const std::string token(buffer.data(), static_cast<std::size_t>(end - buffer.data()));
|
||||
CAPTURE(token)
|
||||
CHECK(native_bits64(token) == b);
|
||||
double out = 0;
|
||||
REQUIRE(eisel_lemire(token, out));
|
||||
CHECK(bits_of(out) == b);
|
||||
|
||||
// insert digits before the exponent of the 17-digit form: that
|
||||
// form lies strictly inside the rounding interval of the double
|
||||
// (the shortest one may lie on its boundary), and the digits move
|
||||
// it by far less than the distance to the boundary, so the value
|
||||
// must not change
|
||||
std::array<char, 64> digits17{};
|
||||
static_cast<void>(std::snprintf(digits17.data(), digits17.size(), "%.17g", d)); // NOLINT(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
|
||||
std::string longer = digits17.data();
|
||||
// insert digits before the exponent: the value moves by far less
|
||||
// than the distance to the rounding boundary, so it must not change
|
||||
std::string longer = token;
|
||||
const std::size_t e = longer.find('e');
|
||||
const std::size_t dot = longer.find('.');
|
||||
const std::string extra = dot == std::string::npos ? ".000000000000000000001" : "000000000000000000001";
|
||||
longer.insert(e == std::string::npos ? longer.size() : e, extra);
|
||||
CAPTURE(longer)
|
||||
CHECK(native_bits64(longer) == b);
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("round trip, binary32")
|
||||
{
|
||||
std::uint32_t state = 5295;
|
||||
for (int i = 0; i < 100000; ++i)
|
||||
{
|
||||
state ^= state << 13u;
|
||||
state ^= state >> 17u;
|
||||
state ^= state << 5u;
|
||||
std::uint32_t b = state;
|
||||
if ((b & 0x7F800000u) == 0x7F800000u)
|
||||
if (eisel_lemire(longer, out))
|
||||
{
|
||||
continue; // infinity or NaN
|
||||
CHECK(bits_of(out) == b);
|
||||
}
|
||||
if (i % 4 == 0)
|
||||
else
|
||||
{
|
||||
b &= 0x807FFFFFu; // subnormals
|
||||
// w and w + 1 round differently: only when the value is very
|
||||
// close to a rounding boundary
|
||||
++declined;
|
||||
}
|
||||
float f = 0;
|
||||
std::memcpy(&f, &b, sizeof(f));
|
||||
|
||||
std::array<char, 64> buffer{};
|
||||
const char* end = nlohmann::detail::to_chars(buffer.data(), buffer.data() + buffer.size(), f);
|
||||
const std::string token(buffer.data(), static_cast<std::size_t>(end - buffer.data()));
|
||||
CAPTURE(token)
|
||||
CHECK(native_bits32(token) == b);
|
||||
}
|
||||
CHECK(declined < 1000); // 107 of the 200,000
|
||||
}
|
||||
|
||||
SECTION("used by the lexer")
|
||||
@@ -1588,177 +1315,3 @@ TEST_CASE("Eisel-Lemire float conversion")
|
||||
"[json.exception.out_of_range.406] number overflow parsing '1.7976931348623159e308'", json::out_of_range&);
|
||||
}
|
||||
}
|
||||
|
||||
namespace
|
||||
{
|
||||
using float_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, float>;
|
||||
|
||||
// the bits of the float that parse() gives for a token, via both scanners;
|
||||
// the value must be the same for both
|
||||
template<typename Json, typename Bits>
|
||||
void check_parse(const std::string& token, Bits expected, Bits infinity)
|
||||
{
|
||||
std::stringstream stream(token);
|
||||
if ((expected & ~(Bits{1} << (8 * sizeof(Bits) - 1))) == infinity)
|
||||
{
|
||||
Json _;
|
||||
CHECK_THROWS_WITH_AS(_ = Json::parse(token), ("[json.exception.out_of_range.406] number overflow parsing '" + token + "'").c_str(), typename Json::out_of_range&);
|
||||
CHECK_THROWS_WITH_AS(_ = Json::parse(stream), ("[json.exception.out_of_range.406] number overflow parsing '" + token + "'").c_str(), typename Json::out_of_range&);
|
||||
return;
|
||||
}
|
||||
const Json contiguous = Json::parse(token);
|
||||
const Json streamed = Json::parse(stream);
|
||||
if (contiguous.is_number_float()) // not an integer that fits
|
||||
{
|
||||
CHECK(bits_of(contiguous.template get<typename Json::number_float_t>()) == expected);
|
||||
CHECK(bits_of(streamed.template get<typename Json::number_float_t>()) == expected);
|
||||
}
|
||||
else
|
||||
{
|
||||
CHECK(streamed.is_number_integer());
|
||||
}
|
||||
}
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("float conversion of hard cases")
|
||||
{
|
||||
// see float_hard_cases.hpp
|
||||
for (const auto& c : float_hard_cases::cases())
|
||||
{
|
||||
const std::string token = c.token;
|
||||
CAPTURE(token)
|
||||
CHECK(native_bits64(token) == c.bits64);
|
||||
CHECK(native_bits32(token) == c.bits32);
|
||||
check_parse<json>(token, c.bits64, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<float_json>(token, c.bits32, std::uint32_t{0x7F800000u});
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("float overflow and underflow in the parser")
|
||||
{
|
||||
SECTION("double")
|
||||
{
|
||||
check_parse<json>("1.7976931348623157e308", std::uint64_t{0x7FEFFFFFFFFFFFFFu}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("1.7976931348623159e308", std::uint64_t{0x7FF0000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("-1e309", std::uint64_t{0xFFF0000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("1" + std::string(400, '0'), std::uint64_t{0x7FF0000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("1e99999999999999999999", std::uint64_t{0x7FF0000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
// an underflow gives a zero with the sign of the token
|
||||
check_parse<json>("1e-400", std::uint64_t{0}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("-1e-400", std::uint64_t{0x8000000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("-2.4703282292062327e-324", std::uint64_t{0x8000000000000000u}, std::uint64_t{0x7FF0000000000000u});
|
||||
check_parse<json>("0." + std::string(400, '0') + "1", std::uint64_t{0}, std::uint64_t{0x7FF0000000000000u});
|
||||
}
|
||||
|
||||
SECTION("float")
|
||||
{
|
||||
check_parse<float_json>("3.4028234e38", std::uint32_t{0x7F7FFFFFu}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("3.4028236e38", std::uint32_t{0x7F800000u}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("-1e39", std::uint32_t{0xFF800000u}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("1e-46", std::uint32_t{0}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("-1e-46", std::uint32_t{0x80000000u}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("-7.006492321624085e-46", std::uint32_t{0x80000000u}, std::uint32_t{0x7F800000u});
|
||||
check_parse<float_json>("-7.006492321624086e-46", std::uint32_t{0x80000001u}, std::uint32_t{0x7F800000u});
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("string scanning kernels")
|
||||
{
|
||||
// the word-at-a-time kernels must stop exactly where a byte-by-byte scan
|
||||
// stops, for any content, length, and alignment
|
||||
const auto reference_special = [](const unsigned char* data, std::size_t n)
|
||||
{
|
||||
std::size_t i = 0;
|
||||
while (i < n && !nlohmann::detail::is_string_special(data[i]))
|
||||
{
|
||||
++i;
|
||||
}
|
||||
return i;
|
||||
};
|
||||
const auto reference_copyable = [](const unsigned char* data, std::size_t n)
|
||||
{
|
||||
std::size_t i = 0;
|
||||
while (i < n && nlohmann::detail::is_ascii_copyable(data[i]))
|
||||
{
|
||||
++i;
|
||||
}
|
||||
return i;
|
||||
};
|
||||
const auto reference_bulk_run = [](const unsigned char* data, std::size_t n)
|
||||
{
|
||||
std::size_t i = 0;
|
||||
while (i < n)
|
||||
{
|
||||
if (data[i] < 0x80u)
|
||||
{
|
||||
if (nlohmann::detail::is_string_special(data[i]))
|
||||
{
|
||||
break;
|
||||
}
|
||||
++i;
|
||||
continue;
|
||||
}
|
||||
const std::size_t seq = nlohmann::detail::validate_one_utf8(data + i, n - i);
|
||||
if (seq == 0)
|
||||
{
|
||||
break;
|
||||
}
|
||||
i += seq;
|
||||
}
|
||||
return i;
|
||||
};
|
||||
|
||||
// pieces: ordinary ASCII, stops, DEL, well-formed sequences of every
|
||||
// length, and ill-formed or truncated ones
|
||||
const std::vector<std::string> pieces =
|
||||
{
|
||||
"a", "Z", " ", "~", "0123456789", "\"", "\\", std::string(1, '\0'), "\n", "\x1F", "\x7F",
|
||||
"\xC3\xA4", "\xE2\x82\xAC", "\xE6\x97\xA5\xE6\x9C\xAC", "\xF0\x9F\x98\x80", "\xED\x9F\xBF",
|
||||
"\x80", "\xC0\x80", "\xC3", "\xE2\x82", "\xED\xA0\x80", "\xF4\x90\x80\x80", "\xFF",
|
||||
};
|
||||
std::uint64_t state = 5295;
|
||||
const auto next = [&state]()
|
||||
{
|
||||
state ^= state << 13u;
|
||||
state ^= state >> 7u;
|
||||
state ^= state << 17u;
|
||||
return state;
|
||||
};
|
||||
// the upper half as a 32-bit value: converts to std::size_t implicitly on
|
||||
// every platform (a cast of std::uint64_t is useless where both are the
|
||||
// same type, and required where std::size_t is 32 bits wide)
|
||||
const auto next_small = [&next]()
|
||||
{
|
||||
return static_cast<std::uint32_t>(next() >> 32u);
|
||||
};
|
||||
for (int round = 0; round < 100000; ++round)
|
||||
{
|
||||
// mostly ordinary text, so that runs span several words
|
||||
std::string text(next_small() % 8u, '.');
|
||||
const std::size_t count = next_small() % 12u;
|
||||
for (std::size_t k = 0; k < count; ++k)
|
||||
{
|
||||
const std::size_t p = (next() % 4 == 0) ? next_small() % pieces.size() : 0;
|
||||
text += pieces[p];
|
||||
text += std::string(next_small() % 10u, 'x');
|
||||
}
|
||||
const auto* data = reinterpret_cast<const unsigned char*>(text.data()); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
||||
for (std::size_t offset = 0; offset < 3 && offset <= text.size(); ++offset)
|
||||
{
|
||||
const std::size_t n = text.size() - offset;
|
||||
CAPTURE(text)
|
||||
CAPTURE(offset)
|
||||
CHECK(nlohmann::detail::find_string_special(data + offset, n) == reference_special(data + offset, n));
|
||||
CHECK(nlohmann::detail::find_ascii_copyable_run(data + offset, n) == reference_copyable(data + offset, n));
|
||||
CHECK(nlohmann::detail::scalar_string_bulk_run(data + offset, n) == reference_bulk_run(data + offset, n));
|
||||
}
|
||||
}
|
||||
|
||||
// the trailing-zero count, whichever implementation the compiler gets
|
||||
for (int k = 0; k < 64; ++k)
|
||||
{
|
||||
const std::uint64_t bit = std::uint64_t{1} << k;
|
||||
CHECK(nlohmann::detail::count_trailing_zeros(bit) == k);
|
||||
CHECK(nlohmann::detail::count_trailing_zeros(bit | (bit << 1u) | 0x8000000000000000u) == k);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -10,7 +10,9 @@
|
||||
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
#include <cstddef>
|
||||
#include <cstdint>
|
||||
#include <iterator>
|
||||
#include <map>
|
||||
#include <string>
|
||||
#include <type_traits>
|
||||
@@ -196,6 +198,198 @@ struct void_erase_map : std::map<Key, T, Compare, Allocator>
|
||||
|
||||
using void_erase_json = nlohmann::basic_json<void_erase_map>;
|
||||
|
||||
// wraps an iterator, but only offers the LegacyForwardIterator operations,
|
||||
// like the iterators of std::unordered_map and other hash maps
|
||||
template<class BaseIterator>
|
||||
class forward_only_iterator
|
||||
{
|
||||
BaseIterator m_it{};
|
||||
|
||||
public:
|
||||
using iterator_category = std::forward_iterator_tag;
|
||||
using value_type = typename std::iterator_traits<BaseIterator>::value_type;
|
||||
using difference_type = typename std::iterator_traits<BaseIterator>::difference_type;
|
||||
using pointer = typename std::iterator_traits<BaseIterator>::pointer;
|
||||
using reference = typename std::iterator_traits<BaseIterator>::reference;
|
||||
|
||||
forward_only_iterator() = default;
|
||||
explicit forward_only_iterator(BaseIterator it) : m_it(it) {}
|
||||
|
||||
BaseIterator base() const
|
||||
{
|
||||
return m_it;
|
||||
}
|
||||
|
||||
reference operator*() const
|
||||
{
|
||||
return *m_it;
|
||||
}
|
||||
pointer operator->() const
|
||||
{
|
||||
return &*m_it;
|
||||
}
|
||||
forward_only_iterator& operator++()
|
||||
{
|
||||
++m_it;
|
||||
return *this;
|
||||
}
|
||||
forward_only_iterator operator++(int)
|
||||
{
|
||||
auto result = *this;
|
||||
++m_it;
|
||||
return result;
|
||||
}
|
||||
|
||||
friend bool operator==(const forward_only_iterator& lhs, const forward_only_iterator& rhs)
|
||||
{
|
||||
return lhs.m_it == rhs.m_it;
|
||||
}
|
||||
friend bool operator!=(const forward_only_iterator& lhs, const forward_only_iterator& rhs)
|
||||
{
|
||||
return lhs.m_it != rhs.m_it;
|
||||
}
|
||||
};
|
||||
|
||||
// An ObjectType whose iterators are forward-only, as those of hash maps are;
|
||||
// it has no rbegin() and its iterators no operator--. A hash map is not used
|
||||
// directly for the same reason as in no_key_compare_map above.
|
||||
template<class Key, class T, class Compare, class Allocator>
|
||||
class forward_only_map
|
||||
{
|
||||
using map_t = std::map<Key, T, Compare, Allocator>;
|
||||
map_t data;
|
||||
|
||||
public:
|
||||
using key_type = typename map_t::key_type;
|
||||
using mapped_type = typename map_t::mapped_type;
|
||||
using value_type = typename map_t::value_type;
|
||||
using size_type = typename map_t::size_type;
|
||||
using allocator_type = typename map_t::allocator_type;
|
||||
using iterator = forward_only_iterator<typename map_t::iterator>;
|
||||
using const_iterator = forward_only_iterator<typename map_t::const_iterator>;
|
||||
|
||||
forward_only_map() noexcept(std::is_nothrow_default_constructible<map_t>::value) : data() {}
|
||||
|
||||
template<class InputIt>
|
||||
forward_only_map(InputIt first, InputIt last) : data(first, last) {}
|
||||
|
||||
iterator begin() noexcept
|
||||
{
|
||||
return iterator(data.begin());
|
||||
}
|
||||
iterator end() noexcept
|
||||
{
|
||||
return iterator(data.end());
|
||||
}
|
||||
const_iterator begin() const noexcept
|
||||
{
|
||||
return const_iterator(data.begin());
|
||||
}
|
||||
const_iterator end() const noexcept
|
||||
{
|
||||
return const_iterator(data.end());
|
||||
}
|
||||
const_iterator cbegin() const noexcept
|
||||
{
|
||||
return const_iterator(data.cbegin());
|
||||
}
|
||||
const_iterator cend() const noexcept
|
||||
{
|
||||
return const_iterator(data.cend());
|
||||
}
|
||||
|
||||
bool empty() const noexcept
|
||||
{
|
||||
return data.empty();
|
||||
}
|
||||
size_type size() const noexcept
|
||||
{
|
||||
return data.size();
|
||||
}
|
||||
size_type max_size() const noexcept
|
||||
{
|
||||
return data.max_size();
|
||||
}
|
||||
void clear() noexcept
|
||||
{
|
||||
data.clear();
|
||||
}
|
||||
|
||||
iterator find(const key_type& key)
|
||||
{
|
||||
return iterator(data.find(key));
|
||||
}
|
||||
const_iterator find(const key_type& key) const
|
||||
{
|
||||
return const_iterator(data.find(key));
|
||||
}
|
||||
size_type count(const key_type& key) const
|
||||
{
|
||||
return data.count(key);
|
||||
}
|
||||
|
||||
std::pair<iterator, bool> emplace(const key_type& key, const mapped_type& value)
|
||||
{
|
||||
const auto result = data.emplace(key, value);
|
||||
return {iterator(result.first), result.second};
|
||||
}
|
||||
|
||||
std::pair<iterator, bool> insert(const value_type& value)
|
||||
{
|
||||
const auto result = data.insert(value);
|
||||
return {iterator(result.first), result.second};
|
||||
}
|
||||
|
||||
template<class InputIt>
|
||||
void insert(InputIt first, InputIt last)
|
||||
{
|
||||
data.insert(first, last);
|
||||
}
|
||||
|
||||
mapped_type& operator[](const key_type& key)
|
||||
{
|
||||
return data[key];
|
||||
}
|
||||
|
||||
mapped_type& at(const key_type& key)
|
||||
{
|
||||
return data.at(key);
|
||||
}
|
||||
const mapped_type& at(const key_type& key) const
|
||||
{
|
||||
return data.at(key);
|
||||
}
|
||||
|
||||
iterator erase(iterator pos)
|
||||
{
|
||||
return iterator(data.erase(pos.base()));
|
||||
}
|
||||
iterator erase(iterator first, iterator last)
|
||||
{
|
||||
return iterator(data.erase(first.base(), last.base()));
|
||||
}
|
||||
size_type erase(const key_type& key)
|
||||
{
|
||||
return data.erase(key);
|
||||
}
|
||||
|
||||
void swap(forward_only_map& other) noexcept(noexcept(data.swap(other.data)))
|
||||
{
|
||||
data.swap(other.data);
|
||||
}
|
||||
|
||||
friend bool operator==(const forward_only_map& lhs, const forward_only_map& rhs)
|
||||
{
|
||||
return lhs.data == rhs.data;
|
||||
}
|
||||
friend bool operator<(const forward_only_map& lhs, const forward_only_map& rhs)
|
||||
{
|
||||
return lhs.data < rhs.data;
|
||||
}
|
||||
};
|
||||
|
||||
using forward_only_json = nlohmann::basic_json<forward_only_map>;
|
||||
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("object type whose erase() returns void")
|
||||
@@ -322,3 +516,46 @@ TEST_CASE("object type without key_compare")
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
TEST_CASE("object type with forward-only iterators")
|
||||
{
|
||||
CHECK(std::is_same<std::iterator_traits<forward_only_json::object_t::iterator>::iterator_category,
|
||||
std::forward_iterator_tag>::value);
|
||||
|
||||
SECTION("destroying nested objects and arrays")
|
||||
{
|
||||
forward_only_json j;
|
||||
j["a"] = 1;
|
||||
j["b"]["c"] = "x";
|
||||
j["b"]["d"] = forward_only_json::array();
|
||||
j["b"]["d"].push_back(forward_only_json::object());
|
||||
j["b"]["d"].push_back(true);
|
||||
j["b"]["e"]["f"]["g"] = nullptr;
|
||||
j["h"] = forward_only_json::object();
|
||||
j["i"]["j"] = 2;
|
||||
|
||||
CHECK(j.size() == 4);
|
||||
CHECK(j["b"].size() == 3);
|
||||
CHECK(j["b"]["d"].size() == 2);
|
||||
CHECK(j["b"]["e"]["f"]["g"].is_null());
|
||||
|
||||
CHECK(j.erase("b") == 1);
|
||||
CHECK(j.size() == 3);
|
||||
j = 42;
|
||||
CHECK(j == 42);
|
||||
}
|
||||
|
||||
SECTION("destroying a deeply nested object")
|
||||
{
|
||||
constexpr std::size_t depth = 100000;
|
||||
forward_only_json j;
|
||||
forward_only_json* cur = &j;
|
||||
for (std::size_t i = 0; i < depth; ++i)
|
||||
{
|
||||
(*cur)["s"] = i;
|
||||
cur = &(*cur)["o"];
|
||||
}
|
||||
CHECK(j["o"]["o"]["s"] == 2);
|
||||
// destroyed at the end of scope without recursing per level
|
||||
}
|
||||
}
|
||||
|
||||
@@ -260,11 +260,10 @@ struct LocaleSwitchingSax final: public nlohmann::json_sax<json>
|
||||
|
||||
TEST_CASE("locale changes between lexer construction and number conversion (#5198)")
|
||||
{
|
||||
// float and double are converted without the locale. A long double that
|
||||
// is not binary64 can take the strtold fallback, which honors the locale
|
||||
// that is current at conversion time. The numbers are chosen so that it
|
||||
// does: too many significant digits for Clinger's fast path, an underflow
|
||||
// that std::from_chars rejects, and a plain value.
|
||||
// The numbers are chosen so that the conversion also takes the strtod
|
||||
// fallback, which honors the locale that is current at conversion time:
|
||||
// too many significant digits for Clinger's fast path, an underflow that
|
||||
// std::from_chars rejects, and a plain value.
|
||||
const std::vector<std::string> numbers = {"3.14159265358979323846", "1.5e-400", "12.34", "-0.000123456789012345678"};
|
||||
std::string text = "[";
|
||||
for (const auto& n : numbers)
|
||||
@@ -328,8 +327,7 @@ TEST_CASE("locale changes between lexer construction and number conversion (#519
|
||||
}
|
||||
}
|
||||
|
||||
// a long double goes through std::strtold unless it is binary64 or
|
||||
// std::from_chars supports it
|
||||
// a long double goes through std::strtold unless std::from_chars supports it
|
||||
{
|
||||
bool switched = false;
|
||||
const auto cb = [&](int /*depth*/, long_double_json::parse_event_t event, long_double_json& /*parsed*/) noexcept
|
||||
@@ -355,15 +353,8 @@ TEST_CASE("locale with a multi-byte decimal point")
|
||||
{
|
||||
// Some locales use a decimal point that is not a single character, e.g.
|
||||
// U+066B ARABIC DECIMAL SEPARATOR (two bytes in UTF-8). It cannot be
|
||||
// substituted in place for '.', so the strtold fallback (only for long
|
||||
// double formats other than binary64) converts a copy of the token with
|
||||
// the whole decimal point instead (#5660). The values must be those of the
|
||||
// "C" locale.
|
||||
using long_double_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, long double>;
|
||||
const char* const long_double_numbers = "[3.14159265358979323846, 1.5e-400, -0.000123456789012345678]";
|
||||
REQUIRE(std::setlocale(LC_NUMERIC, "C") != nullptr);
|
||||
const long_double_json expected_long_double = long_double_json::parse(long_double_numbers);
|
||||
|
||||
// substituted in place for '.', so the strtod fallback stops early. The
|
||||
// conversion must still terminate rather than retry forever.
|
||||
const std::array<const char*, 6> names = {{"ar_EG.UTF-8", "ar_SA.UTF-8", "fa_IR.UTF-8", "ps_AF.UTF-8", "ar_EG", "fa_IR"}};
|
||||
bool tested = false;
|
||||
for (const char* name : names)
|
||||
@@ -381,20 +372,12 @@ TEST_CASE("locale with a multi-byte decimal point")
|
||||
tested = true;
|
||||
|
||||
// too many significant digits for Clinger's fast path, and an underflow
|
||||
// that std::from_chars rejects: double does not depend on the locale
|
||||
// that std::from_chars rejects: both reach the strtod fallback
|
||||
json j;
|
||||
CHECK_NOTHROW(j = json::parse("[3.14159265358979323846, 1.5e-400, -0.000123456789012345678]"));
|
||||
CHECK(j.is_array());
|
||||
CHECK(j[0] == 3.14159265358979323846);
|
||||
CHECK(j[1] == 0.0);
|
||||
CHECK(j[2] == -0.000123456789012345678);
|
||||
CHECK(json::accept("3.14159265358979323846"));
|
||||
|
||||
// a long double that reaches the strtold fallback is not truncated
|
||||
long_double_json ld;
|
||||
CHECK_NOTHROW(ld = long_double_json::parse(long_double_numbers));
|
||||
CHECK(ld == expected_long_double);
|
||||
|
||||
// a value the locale-independent paths convert is not affected
|
||||
CHECK(json::parse("12.5") == 12.5);
|
||||
}
|
||||
|
||||
+1
-261
@@ -15,23 +15,6 @@
|
||||
#include <nlohmann/json.hpp>
|
||||
using nlohmann::detail::dtoa_impl::reinterpret_bits;
|
||||
|
||||
#include <array>
|
||||
#include <cmath>
|
||||
#include <cstdint>
|
||||
#include <cstdio>
|
||||
#include <cstdlib>
|
||||
#include <iomanip>
|
||||
#include <limits>
|
||||
#include <locale>
|
||||
#include <random>
|
||||
#include <sstream>
|
||||
#include <string>
|
||||
#include <utility>
|
||||
#include <vector>
|
||||
#if defined(JSON_HAS_CPP_17)
|
||||
#include <charconv>
|
||||
#endif
|
||||
|
||||
namespace
|
||||
{
|
||||
float make_float(uint32_t sign_bit, uint32_t biased_exponent, uint32_t significand)
|
||||
@@ -467,7 +450,7 @@ TEST_CASE("formatting")
|
||||
check_double( 1.2345e+18, "1.2345e+18" ); // 1.2345e+18 1.2345e+18 1.2345e18
|
||||
check_double( 1.2345e+19, "1.2345e+19" ); // 1.2345e+19 1.2345e+19 1.2345e19
|
||||
check_double( 1.2345e+20, "1.2345e+20" ); // 1.2345e+20 1.2345e+20 1.2345e20
|
||||
check_double( 1.2345e+21, "1.2345e+21" ); // 1.2345e+21 1.2344999999999999e+21 1.2345e21
|
||||
check_double( 1.2345e+21, "1.2344999999999999e+21" ); // 1.2345e+21 1.2344999999999999e+21 1.2345e21
|
||||
check_double( 1.2345e+22, "1.2345e+22" ); // 1.2345e+22 1.2345e+22 1.2345e22
|
||||
}
|
||||
|
||||
@@ -531,246 +514,3 @@ TEST_CASE("formatting")
|
||||
check_integer(1000000000000000000LL, "1000000000000000000");
|
||||
}
|
||||
}
|
||||
|
||||
namespace
|
||||
{
|
||||
// a small unsigned big integer (32-bit limbs, least significant first), to
|
||||
// recompute the powers of ten of the shortest double conversion
|
||||
using big = std::vector<std::uint32_t>;
|
||||
|
||||
void big_mul_small(big& x, std::uint32_t m)
|
||||
{
|
||||
std::uint64_t carry = 0;
|
||||
for (auto& limb : x)
|
||||
{
|
||||
const std::uint64_t v = (static_cast<std::uint64_t>(limb) * m) + carry;
|
||||
limb = static_cast<std::uint32_t>(v);
|
||||
carry = v >> 32u;
|
||||
}
|
||||
if (carry != 0)
|
||||
{
|
||||
x.push_back(static_cast<std::uint32_t>(carry));
|
||||
}
|
||||
}
|
||||
|
||||
void big_div_small(big& x, std::uint32_t d)
|
||||
{
|
||||
std::uint64_t rest = 0;
|
||||
for (std::size_t i = x.size(); i-- > 0;)
|
||||
{
|
||||
const std::uint64_t v = (rest << 32u) | x[i];
|
||||
x[i] = static_cast<std::uint32_t>(v / d);
|
||||
rest = v % d;
|
||||
}
|
||||
while (!x.empty() && x.back() == 0)
|
||||
{
|
||||
x.pop_back();
|
||||
}
|
||||
}
|
||||
|
||||
std::size_t big_bit_length(const big& x)
|
||||
{
|
||||
std::size_t n = 32 * x.size();
|
||||
for (std::uint32_t top = x.back(); (top & 0x80000000u) == 0; top <<= 1u)
|
||||
{
|
||||
--n;
|
||||
}
|
||||
return n;
|
||||
}
|
||||
|
||||
bool big_bit(const big& x, std::size_t i)
|
||||
{
|
||||
return ((x[i / 32] >> (i % 32)) & 1u) != 0;
|
||||
}
|
||||
|
||||
/// the 128 most significant bits of x (floor), shifted left if x has fewer bits
|
||||
std::pair<std::uint64_t, std::uint64_t> big_top128(const big& x)
|
||||
{
|
||||
const std::size_t n = big_bit_length(x);
|
||||
std::uint64_t high = 0;
|
||||
std::uint64_t low = 0;
|
||||
for (std::size_t k = 0; k < 128; ++k)
|
||||
{
|
||||
const bool bit = k < n && big_bit(x, n - 1 - k);
|
||||
if (k < 64)
|
||||
{
|
||||
high = (high << 1u) | (bit ? 1u : 0u);
|
||||
}
|
||||
else
|
||||
{
|
||||
low = (low << 1u) | (bit ? 1u : 0u);
|
||||
}
|
||||
}
|
||||
return {high, low};
|
||||
}
|
||||
|
||||
/// the digits (without trailing zeros) and the decimal exponent of a
|
||||
/// representation "[-]d[.ddd][e[+-]x]"
|
||||
std::pair<std::string, int> digits_and_exponent(const std::string& s)
|
||||
{
|
||||
std::string digits;
|
||||
int point = -1;
|
||||
int exponent = 0;
|
||||
for (std::size_t i = 0; i < s.size(); ++i)
|
||||
{
|
||||
const char c = s[i];
|
||||
if (c >= '0' && c <= '9')
|
||||
{
|
||||
digits += c;
|
||||
}
|
||||
else if (c == '.')
|
||||
{
|
||||
point = static_cast<int>(digits.size());
|
||||
}
|
||||
else if (c == 'e' || c == 'E')
|
||||
{
|
||||
exponent = std::stoi(s.substr(i + 1));
|
||||
break;
|
||||
}
|
||||
}
|
||||
int e = exponent + (point < 0 ? static_cast<int>(digits.size()) : point) - static_cast<int>(digits.size());
|
||||
const std::size_t first = digits.find_first_not_of('0');
|
||||
digits = first == std::string::npos ? "0" : digits.substr(first);
|
||||
while (digits.size() > 1 && digits.back() == '0')
|
||||
{
|
||||
digits.pop_back();
|
||||
++e;
|
||||
}
|
||||
return {digits, e};
|
||||
}
|
||||
|
||||
/// whether the decimal digits * 10^e reads back as v
|
||||
bool reads_back(const std::string& digits, int e, double v)
|
||||
{
|
||||
const std::string text = digits + "e" + std::to_string(e);
|
||||
// (compared bit for bit: v is positive and finite, and -Wfloat-equal)
|
||||
return reinterpret_bits<std::uint64_t>(std::strtod(text.c_str(), nullptr)) == reinterpret_bits<std::uint64_t>(v);
|
||||
}
|
||||
|
||||
/// Check the representation of a positive finite double: it reads back as
|
||||
/// the same value, and no representation with fewer digits does.
|
||||
void check_shortest(double v)
|
||||
{
|
||||
std::array<char, 33> buf{};
|
||||
char* end = nlohmann::detail::to_chars(buf.data(), buf.data() + 32, v);
|
||||
const std::string text(buf.data(), end);
|
||||
CAPTURE(text)
|
||||
CHECK(std::strtod(text.c_str(), nullptr) == v);
|
||||
// the layout is that of format_buffer() for the same digits
|
||||
std::array<char, 64> reference{};
|
||||
int len = 0;
|
||||
int exponent = 0;
|
||||
nlohmann::detail::dtoa_impl::shortest_digits(reference.data(), len, exponent, v);
|
||||
const char* const reference_end = nlohmann::detail::dtoa_impl::format_buffer(reference.data(), len, exponent, -4, 15);
|
||||
CHECK(text == std::string(reference.data(), static_cast<std::size_t>(reference_end - reference.data())));
|
||||
const auto de = digits_and_exponent(text);
|
||||
const std::string& digits = de.first;
|
||||
if (digits.size() > 1)
|
||||
{
|
||||
// the decimals of one digit fewer next to the value
|
||||
// (a stream rather than snprintf("%.*e"), whose output GCC cannot bound)
|
||||
std::ostringstream shorter;
|
||||
shorter.imbue(std::locale::classic());
|
||||
shorter << std::scientific << std::setprecision(static_cast<int>(digits.size()) - 2) << v;
|
||||
const auto near = digits_and_exponent(shorter.str());
|
||||
// as an integer with digits.size() - 1 digits
|
||||
std::string m = near.first;
|
||||
int e = near.second;
|
||||
while (m.size() < digits.size() - 1)
|
||||
{
|
||||
m += '0';
|
||||
--e;
|
||||
}
|
||||
const std::uint64_t mid = std::stoull(m);
|
||||
for (const std::uint64_t candidate :
|
||||
{
|
||||
mid - 1, mid, mid + 1
|
||||
})
|
||||
{
|
||||
CAPTURE(candidate)
|
||||
CHECK(!reads_back(std::to_string(candidate), e, v));
|
||||
}
|
||||
}
|
||||
#if defined(JSON_HAS_CPP_17) && defined(__cpp_lib_to_chars)
|
||||
// the closest of the shortest representations, as std::to_chars finds it
|
||||
std::array<char, 64> std_text{};
|
||||
const auto r = std::to_chars(std_text.data(), std_text.data() + std_text.size(), v, std::chars_format::scientific);
|
||||
CHECK(digits_and_exponent(std::string(std_text.data(), r.ptr)) == de);
|
||||
#endif
|
||||
}
|
||||
} // namespace
|
||||
|
||||
TEST_CASE("shortest digits of doubles")
|
||||
{
|
||||
SECTION("powers of ten")
|
||||
{
|
||||
// the 128-bit significands of 10^k, rounded down, recomputed
|
||||
for (int k = -342; k <= 341; ++k)
|
||||
{
|
||||
CAPTURE(k)
|
||||
big x{1};
|
||||
if (k >= 0)
|
||||
{
|
||||
for (int i = 0; i < k; ++i)
|
||||
{
|
||||
big_mul_small(x, 10);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
// floor(2^b / 10^-k) for a b that leaves more than 128 bits
|
||||
const int b = 128 + 64 + (4 * -k);
|
||||
x.assign(static_cast<std::size_t>(b / 32) + 1, 0);
|
||||
x.back() = 1u << (b % 32);
|
||||
for (int i = 0; i < -k; ++i)
|
||||
{
|
||||
big_div_small(x, 10);
|
||||
}
|
||||
}
|
||||
const auto expected = big_top128(x);
|
||||
const auto actual = nlohmann::detail::zmij::pow10(k);
|
||||
CHECK(actual.high == expected.first);
|
||||
CHECK(actual.low == expected.second);
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("boundary values")
|
||||
{
|
||||
for (const double v :
|
||||
{
|
||||
std::numeric_limits<double>::min(), std::numeric_limits<double>::max(), std::numeric_limits<double>::denorm_min(),
|
||||
std::nextafter(std::numeric_limits<double>::min(), 0.0), 1.0, 2.0, 0.1, 0.3, 1e21, 1e22, 1e23, 5e-324, 9007199254740993.0,
|
||||
1.2345e+21, 2.2250738585072014e-308, 1.7976931348623157e308, 4.9406564584124654e-324, 123456789012345680.0
|
||||
})
|
||||
{
|
||||
check_shortest(v);
|
||||
}
|
||||
// all powers of two (their rounding interval is narrower below)
|
||||
for (int e = -1074; e <= 1023; ++e)
|
||||
{
|
||||
check_shortest(std::ldexp(1.0, e));
|
||||
}
|
||||
// powers of ten and their neighbors
|
||||
for (int e = -323; e <= 308; ++e)
|
||||
{
|
||||
const double p = std::strtod(("1e" + std::to_string(e)).c_str(), nullptr);
|
||||
check_shortest(p);
|
||||
check_shortest(std::nextafter(p, 0.0));
|
||||
check_shortest(std::nextafter(p, std::numeric_limits<double>::infinity()));
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("random doubles")
|
||||
{
|
||||
std::mt19937_64 rng(5295); // NOLINT(cert-msc32-c,cert-msc51-cpp,bugprone-random-generator-seed): reproducible
|
||||
for (int i = 0; i < 100000; ++i)
|
||||
{
|
||||
const std::uint64_t bits = rng() & 0x7FFFFFFFFFFFFFFFu;
|
||||
const auto v = reinterpret_bits<double>(bits);
|
||||
if (std::isfinite(v) && bits != 0)
|
||||
{
|
||||
check_shortest(v);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user