mirror of
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Compare commits
| Author | SHA1 | Date | |
|---|---|---|---|
 Niels Lohmann
|
b15ec08275 | ||
|
Niels Lohmann
|
93fe62fc0b |
@@ -1395,7 +1395,7 @@ THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR I
|
||||
- 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/)
|
||||
- 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 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).
|
||||
- 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
|
||||
|
||||
<img align="right" src="https://git.fsfe.org/reuse/reuse-ci/raw/branch/master/reuse-horizontal.png" alt="REUSE Software">
|
||||
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||||
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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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@@ -89,6 +89,9 @@ Strong exception safety: if an exception occurs, the original value stays intact
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- Throws [`out_of_range.410`](../../home/exceptions.md#jsonexceptionout_of_range410) if an array index in the passed
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JSON pointer `ptr` exceeds the range of `size_type` (e.g., on 32-bit platforms).
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For the **const** version, an object key or array index in `ptr` that does not exist is not reported by an
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exception, but is undefined behavior (see the notes below). Use [`at`](at.md) for checked access.
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## Complexity
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1. Constant if `idx` is in the range of the array. Otherwise, linear in `idx - size()`.
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@@ -103,9 +106,12 @@ Strong exception safety: if an exception occurs, the original value stays intact
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The following cases apply to the **const** overloads; the non-const overloads instead insert the missing element
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(see the notes below).
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1. If the element at index `idx` does not exist, the behavior is undefined.
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1. If the element at index `idx` does not exist, the behavior is undefined and is **guarded by a
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[runtime assertion](../../features/assertions.md)**!
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2. If the element with key `key` does not exist, the behavior is undefined and is **guarded by a
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[runtime assertion](../../features/assertions.md)**!
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3. If the JSON pointer `ptr` refers to an object key or an array index that does not exist, the behavior is
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undefined and is **guarded by a [runtime assertion](../../features/assertions.md)**!
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1. The non-const version may add values: If `idx` is beyond the range of the array (i.e., `idx >= size()`), then the
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array is silently filled up with `#!json null` values to make `idx` a valid reference to the last stored element. In
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@@ -261,9 +267,11 @@ Strong exception safety: if an exception occurs, the original value stays intact
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## Version history
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1. Added in version 1.0.0. Fixed in version 3.13.0 to throw `#!cpp std::length_error` instead of emptying the array and
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accessing it out of bounds when `idx` equals the maximum value of `size_type`.
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accessing it out of bounds when `idx` equals the maximum value of `size_type`. A missing index in the const version
|
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is guarded by a runtime assertion since version 3.13.0.
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2. Added in version 1.0.0. Added overloads for `T* key` in version 1.1.0. Removed overloads for `T* key` (replaced by 3)
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in version 3.11.0.
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3. Added in version 3.11.0. Fixed in version 3.13.0 to consistently accept `std::string_view`-convertible keys, as
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already supported by [`at`](at.md), [`value`](value.md), [`find`](find.md), and other lookup functions.
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4. Added in version 2.0.0.
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4. Added in version 2.0.0. A missing array index in the const version is guarded by a runtime assertion since
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version 3.13.0.
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@@ -16,14 +16,15 @@ before including the `json.hpp` header.
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## Function with runtime assertions
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### Unchecked object access to a const value
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### Unchecked access to a const value
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Function [`operator[]`](../api/basic_json/operator%5B%5D.md) implements unchecked access for objects. Whereas a missing
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key is added in the case of non-const objects, accessing a const object with a missing key is undefined behavior (think
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of a dereferenced null pointer) and yields a runtime assertion.
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Function [`operator[]`](../api/basic_json/operator%5B%5D.md) implements unchecked access for arrays and objects. Whereas
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a missing element is added in the case of non-const values, accessing a const value with a missing object key or an
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invalid array index is undefined behavior (think of a dereferenced null pointer) and yields a runtime assertion. This
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also applies to a [JSON pointer](json_pointer.md) that refers to a missing key or an invalid index.
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If you are not sure whether an element in an object exists, use checked access with the
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[`at` function](../api/basic_json/at.md) or call the [`contains` function](../api/basic_json/contains.md) before.
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If you are not sure whether an element exists, use checked access with the [`at` function](../api/basic_json/at.md)
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or call the [`contains` function](../api/basic_json/contains.md) before.
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See also the documentation on [element access](element_access/index.md).
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@@ -46,7 +47,30 @@ See also the documentation on [element access](element_access/index.md).
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Output:
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```
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Assertion failed: (m_value.object->find(key) != m_value.object->end()), function operator[], file json.hpp, line 2144.
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Assertion failed: (it != m_data.m_value.object->end()), function operator[], file json.hpp, line 28795.
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```
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??? example "Example 2: Invalid array index in a JSON pointer"
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The following code will trigger an assertion at runtime:
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```cpp
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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using namespace nlohmann::literals;
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int main()
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{
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const json j = {{"array", {1, 2, 3}}};
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auto v = j["/array/5"_json_pointer];
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}
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```
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Output:
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```
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Assertion failed: (idx < m_data.m_value.array->size()), function operator[], file json.hpp, line 28758.
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```
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### Constructing from an uninitialized iterator range
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@@ -71,11 +71,10 @@ otherwise, it uses unsigned integer storage.
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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 with
|
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[`std::strtold`](https://en.cppreference.com/w/cpp/string/byte/strtof), which gets the decimal point of the
|
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current locale, also one longer than one byte (e.g., in `fa_IR.UTF-8`).
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- As of version 3.9.1, the conversion is realized by
|
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[`std::strtoull`](https://en.cppreference.com/w/cpp/string/byte/strtoul),
|
||||
[`std::strtoll`](https://en.cppreference.com/w/cpp/string/byte/strtol), and
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||||
[`std::strtod`](https://en.cppreference.com/w/cpp/string/byte/strtof), respectively.
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!!! example "Examples"
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@@ -86,10 +85,10 @@ otherwise, it uses unsigned integer storage.
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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
|
||||
- Numbers exceeding the limits of `#!c double` (i.e., numbers that after conversion via
|
||||
[`std::strtod`](https://en.cppreference.com/w/cpp/string/byte/strtof) are not satisfying
|
||||
[`std::isfinite`](https://en.cppreference.com/w/cpp/numeric/math/isfinite) such as `#!c 1E400`) will throw exception
|
||||
[`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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@@ -26,9 +26,8 @@ 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
|
||||
stored as a `#!cpp long double` that is not IEEE 754 binary64 (e.g., the 80-bit x87 format), because the lexer
|
||||
hands the buffer to `#!cpp std::strtold`.
|
||||
- A [`StringType`](#stringtype) whose `data()` is not null-terminated compiles and silently misparses numbers,
|
||||
because the lexer hands the buffer to `#!cpp std::strtoull`/`#!cpp std::strtoll`/`#!cpp std::strtod`.
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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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||||
@@ -536,10 +535,8 @@ therefore silently changes parse results rather than raising an error. See
|
||||
|
||||
`NumberFloatType` must be one of `#!cpp float`, `#!cpp double`, or `#!cpp long double`:
|
||||
|
||||
- The [parser](../parsing/index.md) converts number literals to `#!cpp float`, `#!cpp double`, and a
|
||||
`#!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
|
||||
these three types.
|
||||
- The [parser](../parsing/index.md) converts number literals with `#!cpp std::strtof`, `#!cpp std::strtod`, or
|
||||
`#!cpp std::strtold`; the library provides overloads for exactly these three types.
|
||||
- [`dump`](../../api/basic_json/dump.md) falls back to `#!cpp std::snprintf` with the `%g` and `%Lg` conversion
|
||||
specifiers, for which the library likewise provides only `#!cpp double` and `#!cpp long double` overloads
|
||||
(`#!cpp float` is promoted to `#!cpp double`).
|
||||
|
||||
@@ -20,4 +20,4 @@ The class contains a slightly modified version of the Grisu2 algorithm from Flor
|
||||
|
||||
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
|
||||
|
||||
@@ -39,25 +39,6 @@ inline int count_leading_zeros(std::uint64_t x) noexcept
|
||||
#endif
|
||||
}
|
||||
|
||||
/// number of trailing zero bits of x (x != 0)
|
||||
inline int count_trailing_zeros(std::uint64_t x) noexcept
|
||||
{
|
||||
#if defined(__GNUC__) || defined(__clang__)
|
||||
return __builtin_ctzll(x);
|
||||
#else
|
||||
int n = 0;
|
||||
for (int shift = 32; shift != 0; shift >>= 1)
|
||||
{
|
||||
if ((x << (64 - shift)) == 0)
|
||||
{
|
||||
n += shift;
|
||||
x >>= shift;
|
||||
}
|
||||
}
|
||||
return n;
|
||||
#endif
|
||||
}
|
||||
|
||||
/// the 128-bit product of two 64-bit numbers
|
||||
struct uint128_parts
|
||||
{
|
||||
@@ -87,19 +68,14 @@ inline uint128_parts full_multiplication(std::uint64_t a, std::uint64_t b) noexc
|
||||
|
||||
/// eight bytes as a little-endian word (compilers fold this into one load on
|
||||
/// little-endian targets)
|
||||
inline std::uint64_t read_eight_bytes(const unsigned char* b) noexcept
|
||||
inline std::uint64_t read_eight_bytes(const char* p) noexcept
|
||||
{
|
||||
const auto* b = reinterpret_cast<const unsigned char*>(p); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
|
||||
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
|
||||
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)
|
||||
}
|
||||
|
||||
} // namespace detail
|
||||
NLOHMANN_JSON_NAMESPACE_END
|
||||
|
||||
@@ -1059,11 +1059,9 @@ 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.
|
||||
{
|
||||
@@ -1076,7 +1074,7 @@ 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;
|
||||
|
||||
@@ -1406,8 +1404,8 @@ 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)
|
||||
{
|
||||
@@ -1476,11 +1474,10 @@ 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
@@ -12,7 +12,6 @@
|
||||
#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
|
||||
@@ -70,12 +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)
|
||||
@@ -109,7 +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)
|
||||
@@ -120,9 +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)
|
||||
@@ -249,18 +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;
|
||||
}
|
||||
@@ -275,7 +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)
|
||||
@@ -283,8 +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)
|
||||
|
||||
@@ -536,6 +536,10 @@ class json_pointer
|
||||
@return const reference to the JSON value pointed to by the JSON
|
||||
pointer
|
||||
|
||||
@pre Every object key and array index the pointer refers to exists.
|
||||
Like the const operator[] for keys and indices, a missing one is
|
||||
undefined behavior, guarded by a runtime assertion.
|
||||
|
||||
@throw parse_error.106 if an array index begins with '0'
|
||||
@throw parse_error.109 if an array index was not a number
|
||||
@throw out_of_range.402 if the array index '-' is used
|
||||
@@ -550,7 +554,8 @@ class json_pointer
|
||||
{
|
||||
case detail::value_t::object:
|
||||
{
|
||||
// use unchecked object access
|
||||
// use unchecked object access; the const operator[]
|
||||
// asserts that the key exists
|
||||
ptr = &ptr->operator[](reference_token);
|
||||
break;
|
||||
}
|
||||
@@ -563,7 +568,8 @@ class json_pointer
|
||||
JSON_THROW(detail::out_of_range::create(402, detail::concat("array index '-' (", std::to_string(ptr->m_data.m_value.array->size()), ") is out of range"), ptr));
|
||||
}
|
||||
|
||||
// use unchecked array access
|
||||
// use unchecked array access; the const operator[]
|
||||
// asserts that the index exists
|
||||
ptr = &ptr->operator[](array_index<BasicJsonType>(reference_token));
|
||||
break;
|
||||
}
|
||||
|
||||
@@ -2874,6 +2874,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
// const operator[] only works for arrays
|
||||
if (JSON_HEDLEY_LIKELY(is_array()))
|
||||
{
|
||||
JSON_ASSERT(idx < m_data.m_value.array->size());
|
||||
return m_data.m_value.array->operator[](idx);
|
||||
}
|
||||
|
||||
|
||||
+442
-783
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},
|
||||
{"0.100000000000000012490009027033011079765856266021728515625", 0x3FB999999999999Au, 0x3DCCCCCDu},
|
||||
{"1.00000000000000012490009027033011079765856266021728515626e-1", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"100000000000000012490009027033011079765856266021728515624e-57", 0x3FB999999999999Au, 0x3DCCCCCDu},
|
||||
{"0.10000000000000001249000902703301107976585626602172851562501", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"0.10000000000000001", 0x3FB999999999999Au, 0x3DCCCCCDu},
|
||||
{"1.0000000000000002e-1", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"-1.000000000000000124e-1", 0xBFB999999999999Au, 0xBDCCCCCDu},
|
||||
{"1000000000000000125e-19", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"-10000000000000001249e-20", 0xBFB999999999999Au, 0xBDCCCCCDu},
|
||||
{"0.1000000000000000125", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"0.10000000000000001249", 0x3FB999999999999Au, 0x3DCCCCCDu},
|
||||
{"1.00000000000000012491e-1", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"1.00000000000000012490009027033e-1", 0x3FB999999999999Au, 0x3DCCCCCDu},
|
||||
{"100000000000000012490009027034e-30", 0x3FB999999999999Bu, 0x3DCCCCCDu},
|
||||
{"2.45134755833537796875e14", 0x42EBDE5C4164D83Au, 0x575EF2E2u},
|
||||
{"-245134755833537796876e-6", 0xC2EBDE5C4164D83Au, 0xD75EF2E2u},
|
||||
{"-245134755833537.796874", 0xC2EBDE5C4164D839u, 0xD75EF2E2u},
|
||||
{"2.4513475583353779687501e14", 0x42EBDE5C4164D83Au, 0x575EF2E2u},
|
||||
{"245134755833537796875000000000000000000001e-27", 0x42EBDE5C4164D83Au, 0x575EF2E2u},
|
||||
{"245134755833537.796875000000000000000000000000000000", 0x42EBDE5C4164D83Au, 0x575EF2E2u},
|
||||
{"2.4513475583353779e14", 0x42EBDE5C4164D839u, 0x575EF2E2u},
|
||||
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|
||||
{"-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
|
||||
+108
-376
@@ -13,18 +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 <sstream> // stringstream
|
||||
#include <string> // string
|
||||
#include <utility> // pair
|
||||
#include <vector> // vector
|
||||
|
||||
#include "float_hard_cases.hpp"
|
||||
|
||||
namespace
|
||||
{
|
||||
// shortcut to scan a string literal
|
||||
@@ -260,7 +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"
|
||||
};
|
||||
@@ -282,18 +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
|
||||
@@ -664,145 +663,46 @@ TEST_CASE("lexer string fast path")
|
||||
}
|
||||
}
|
||||
|
||||
namespace
|
||||
TEST_CASE("parse_float_fast declines what it cannot convert exactly")
|
||||
{
|
||||
// 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)
|
||||
// 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)
|
||||
{
|
||||
if (s[i] == '.')
|
||||
{
|
||||
dot = i;
|
||||
}
|
||||
else if (s[i] == 'e' || s[i] == 'E')
|
||||
{
|
||||
mantissa_end = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return {dot, mantissa_end};
|
||||
}
|
||||
return nlohmann::detail::parse_float_fast(s.data(), s.data() + s.size(), out);
|
||||
};
|
||||
double out = 0;
|
||||
|
||||
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);
|
||||
}
|
||||
#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
|
||||
|
||||
std::uint64_t bits_of(double d)
|
||||
{
|
||||
std::uint64_t b = 0;
|
||||
std::memcpy(&b, &d, sizeof(b));
|
||||
return b;
|
||||
}
|
||||
// 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));
|
||||
|
||||
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
|
||||
@@ -906,6 +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")
|
||||
@@ -1303,33 +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;
|
||||
@@ -1351,51 +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")
|
||||
@@ -1409,177 +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);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -257,11 +257,10 @@ 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)
|
||||
@@ -325,8 +324,7 @@ 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
|
||||
@@ -352,15 +350,8 @@ 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)
|
||||
@@ -378,20 +369,12 @@ 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);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user