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Compare commits
| Author | SHA1 | Date | |
|---|---|---|---|
 Niels Lohmann
|
9c71689715 | ||
|
Niels Lohmann
|
44ec53c77b |
@@ -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 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
|
||||
- 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
|
||||
|
||||
<img align="right" src="https://git.fsfe.org/reuse/reuse-ci/raw/branch/master/reuse-horizontal.png" alt="REUSE Software">
|
||||
|
||||
|
||||
@@ -23,9 +23,10 @@ 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. 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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||||
: 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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||||
[binary formats](../../features/binary_formats/index.md) additionally require `#!cpp float` or `#!cpp double`,
|
||||
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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||||
|
||||
@@ -71,10 +71,11 @@ otherwise, it uses unsigned integer storage.
|
||||
|
||||
- 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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||||
- 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),
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[`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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||||
- 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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|
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!!! example "Examples"
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|
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@@ -85,10 +86,10 @@ 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 that after conversion via
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||||
[`std::strtod`](https://en.cppreference.com/w/cpp/string/byte/strtof) are not satisfying
|
||||
- Numbers exceeding the limits of `#!c double` (i.e., numbers whose rounded value is 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.
|
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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.
|
||||
- Floating-point numbers are rounded to the next number representable as `double`. For instance
|
||||
`#!c 3.141592653589793238462643383279` is stored as [`0x400921fb54442d18`](https://float.exposed/0x400921fb54442d18).
|
||||
This is the same behavior as the code `#!c double x = 3.141592653589793238462643383279;`.
|
||||
|
||||
@@ -26,8 +26,9 @@ Requirements are split into two groups:
|
||||
diagnosed with dedicated error messages, and violating most of them results in a compiler error somewhere inside
|
||||
the library. Four violations are not caught at compile time at all:
|
||||
|
||||
- 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`.
|
||||
- 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 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.
|
||||
- The two [cross-specialization conversions](#cross-specialization-conversions) below. These abort on an assertion
|
||||
@@ -535,8 +536,10 @@ 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 with `#!cpp std::strtof`, `#!cpp std::strtod`, or
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`#!cpp std::strtold`; the library provides overloads for exactly these three types.
|
||||
- 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.
|
||||
- [`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 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
|
||||
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
|
||||
|
||||
@@ -1059,9 +1059,11 @@ class lexer : public lexer_base<BasicJsonType>
|
||||
token_type::parse_error otherwise
|
||||
|
||||
@note The scanner is independent of the current locale: token_buffer
|
||||
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()).
|
||||
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()).
|
||||
*/
|
||||
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.
|
||||
{
|
||||
@@ -1074,7 +1076,7 @@ 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 count significant digits; npos means
|
||||
// convert_number() uses it to split the token; npos means
|
||||
// "not seen an exponent yet" and is resolved at scan_number_done
|
||||
std::size_t mantissa_end = std::string::npos;
|
||||
|
||||
@@ -1404,8 +1406,8 @@ 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);
|
||||
used to skip Clinger's fast path when it cannot
|
||||
possibly succeed - see detail::mantissa_fits_clinger()
|
||||
with decimal_point_position, it locates the parts
|
||||
of a float token without scanning it again
|
||||
*/
|
||||
token_type convert_number(token_type number_type, std::size_t mantissa_end)
|
||||
{
|
||||
@@ -1474,10 +1476,11 @@ scan_number_done:
|
||||
}
|
||||
|
||||
// this code is reached if we parse a floating-point number or if an
|
||||
// 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.
|
||||
// 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.
|
||||
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
+21
-48
@@ -1004,38 +1004,18 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
using copy_scratch_value_t = std::pair<typename object_t::key_type, basic_json>;
|
||||
using copy_scratch_t = std::vector<copy_scratch_value_t, AllocatorType<copy_scratch_value_t>>;
|
||||
|
||||
/// @brief tag selecting the constructor below; used only to build the
|
||||
/// elements of a deep copy (@ref copy_array_level, @ref copy_object_level)
|
||||
struct copy_construct_tag {};
|
||||
|
||||
public:
|
||||
/*!
|
||||
@brief construct a null value whose base class - and, with @ref
|
||||
JSON_DIAGNOSTIC_POSITIONS, positions - are copied from @a src
|
||||
|
||||
Copy-constructing @ref json_base_class_t here, rather than default-
|
||||
constructing the element and assigning its base class afterwards, means
|
||||
that copying a @ref basic_json only ever requires a copy-constructible
|
||||
base class, and never a move-assignable one as well.
|
||||
|
||||
@note this constructor has to be public: @ref copy_array_level and
|
||||
@ref copy_object_level reach it through @ref array_t's or @ref
|
||||
object_t's own emplace_back(), which constructs the element from
|
||||
outside @ref basic_json and so cannot call a private constructor.
|
||||
@ref copy_construct_tag is private, though, and nothing in the
|
||||
public interface hands out a value of it, so outside code can still
|
||||
never name it to call this constructor itself.
|
||||
*/
|
||||
basic_json(copy_construct_tag /*unused*/, const basic_json& src)
|
||||
: json_base_class_t(src)
|
||||
#if JSON_DIAGNOSTIC_POSITIONS
|
||||
, start_position(src.start_position)
|
||||
, end_position(src.end_position)
|
||||
#endif
|
||||
/// @brief copy everything of @a src into @a dst but its type and value
|
||||
static void copy_metadata(const basic_json& src, basic_json& dst)
|
||||
{
|
||||
}
|
||||
// a custom base class is only required to be copy-constructible and
|
||||
// move-assignable, so the copy has to go through a temporary
|
||||
static_cast<json_base_class_t&>(dst) = json_base_class_t(static_cast<const json_base_class_t&>(src));
|
||||
|
||||
private:
|
||||
#if JSON_DIAGNOSTIC_POSITIONS
|
||||
dst.start_position = src.start_position;
|
||||
dst.end_position = src.end_position;
|
||||
#endif
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief copy the value of @a src into @a dst, which must not be structured
|
||||
@@ -1099,11 +1079,8 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
}
|
||||
|
||||
/*!
|
||||
@brief finish the copy @a dst of @a src that a @ref copy_construct_tag
|
||||
constructor started, other than the children of an object or array
|
||||
@brief copy everything of @a src into the null value @a dst but the children
|
||||
|
||||
@a dst already has @a src's base class and, with @ref
|
||||
JSON_DIAGNOSTIC_POSITIONS, positions; only its value is still missing.
|
||||
Objects and arrays are not copied here; they are appended to @a worklist to
|
||||
be created later by @ref copy_iteratively. Until that happens, @a dst remains
|
||||
a null value, so that a partially built copy can be destroyed at any point
|
||||
@@ -1111,6 +1088,8 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
*/
|
||||
static void copy_shallow(const basic_json& src, basic_json& dst, copy_worklist_t& worklist)
|
||||
{
|
||||
copy_metadata(src, dst);
|
||||
|
||||
if (src.m_data.m_type == value_t::object || src.m_data.m_type == value_t::array)
|
||||
{
|
||||
// defer: dst stays a null value until its container exists
|
||||
@@ -1131,19 +1110,15 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
{
|
||||
const array_t& src_array = *src.m_data.m_value.array;
|
||||
|
||||
// create all elements up front: growing the array afterwards could
|
||||
// invalidate the pointers that are handed to the worklist; resize()
|
||||
// rather than the fill constructor, because not every array type
|
||||
// provides the latter (e.g., ones without a matching allocator-aware
|
||||
// fill constructor)
|
||||
dst.m_data.m_value.array = create<array_t>();
|
||||
// only now that the array exists may dst stop being a null value
|
||||
dst.m_data.m_type = value_t::array;
|
||||
|
||||
// create every element - its base class already copy-constructed from
|
||||
// its counterpart in src, via the copy_construct_tag constructor -
|
||||
// before any of their addresses are handed to worklist below: growing
|
||||
// the array while that is going on could reallocate it and invalidate
|
||||
// addresses taken from an earlier iteration
|
||||
for (const auto& src_element : src_array)
|
||||
{
|
||||
dst.m_data.m_value.array->emplace_back(copy_construct_tag{}, src_element);
|
||||
}
|
||||
dst.m_data.m_value.array->resize(src_array.size());
|
||||
|
||||
auto dst_it = dst.m_data.m_value.array->begin();
|
||||
for (auto src_it = src_array.cbegin(); src_it != src_array.cend(); ++src_it, ++dst_it)
|
||||
@@ -1161,14 +1136,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
|
||||
|
||||
// build the complete key skeleton and hand it to the object's range
|
||||
// constructor: adding the keys one by one would be quadratic for object
|
||||
// types that are backed by a vector, such as nlohmann::ordered_map; each
|
||||
// value's base class is already copy-constructed from its counterpart
|
||||
// in src, via the copy_construct_tag constructor
|
||||
// types that are backed by a vector, such as nlohmann::ordered_map
|
||||
scratch.clear();
|
||||
scratch.reserve(src_object.size());
|
||||
for (const auto& element : src_object)
|
||||
{
|
||||
scratch.emplace_back(element.first, basic_json(copy_construct_tag{}, element.second));
|
||||
scratch.emplace_back(element.first, basic_json());
|
||||
}
|
||||
|
||||
dst.m_data.m_value.object = create<object_t>(std::make_move_iterator(scratch.begin()),
|
||||
|
||||
+741
-440
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,599 @@
|
||||
// __ _____ _____ _____
|
||||
// __| | __| | | | 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},
|
||||
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|
||||
{"-16449216019182103706535606608388384863861375606575165875256061553955078124e-94", 0xBB9F125A50000000u, 0x9CF892D2u},
|
||||
{"-0.0000000000000000000016449216019182103", 0xBB9F125A50000000u, 0x9CF892D2u},
|
||||
{"-1.6449216019182104e-21", 0xBB9F125A50000000u, 0x9CF892D3u},
|
||||
{"-1.64492160191821037e-21", 0xBB9F125A50000000u, 0x9CF892D2u},
|
||||
{"-1644921601918210371e-39", 0xBB9F125A50000000u, 0x9CF892D3u},
|
||||
{"-16449216019182103706e-40", 0xBB9F125A50000000u, 0x9CF892D2u},
|
||||
{"0.0000000000000000000016449216019182103707", 0x3B9F125A50000000u, 0x1CF892D3u},
|
||||
{"0.00000000000000000000164492160191821037065", 0x3B9F125A50000000u, 0x1CF892D2u},
|
||||
{"1.64492160191821037066e-21", 0x3B9F125A50000000u, 0x1CF892D3u},
|
||||
{"1.64492160191821037065356066083e-21", 0x3B9F125A50000000u, 0x1CF892D2u},
|
||||
{"164492160191821037065356066084e-50", 0x3B9F125A50000000u, 0x1CF892D3u},
|
||||
{"6.565061509609222412109375e-1", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"6565061509609222412109376e-25", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"0.6565061509609222412109374", 0x3FE5021930000000u, 0x3F2810C9u},
|
||||
{"6.56506150960922241210937501e-1", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"6565061509609222412109375000000000000000000001e-46", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"-0.6565061509609222412109375000000000000000000000000000000", 0xBFE5021930000000u, 0xBF2810CAu},
|
||||
{"6.5650615096092224e-1", 0x3FE5021930000000u, 0x3F2810C9u},
|
||||
{"-65650615096092225e-17", 0xBFE5021930000000u, 0xBF2810CAu},
|
||||
{"6565061509609222412e-19", 0x3FE5021930000000u, 0x3F2810C9u},
|
||||
{"0.6565061509609222413", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"0.65650615096092224121", 0x3FE5021930000000u, 0x3F2810C9u},
|
||||
{"6.5650615096092224122e-1", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"-6.5650615096092224121e-1", 0xBFE5021930000000u, 0xBF2810C9u},
|
||||
{"656506150960922241211e-21", 0x3FE5021930000000u, 0x3F2810CAu},
|
||||
{"18014627239033005156980393746124491372029297053813934326171875e-77", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"0.00000000000000018014627239033005156980393746124491372029297053813934326171876", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"-1.8014627239033005156980393746124491372029297053813934326171874e-16", 0xBCA9F63970000000u, 0xA54FB1CBu},
|
||||
{"1801462723903300515698039374612449137202929705381393432617187501e-79", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"18014627239033005e-32", 0x3CA9F63970000000u, 0x254FB1CBu},
|
||||
{"0.00000000000000018014627239033006", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"0.0000000000000001801462723903300515", 0x3CA9F63970000000u, 0x254FB1CBu},
|
||||
{"-1.801462723903300516e-16", 0xBCA9F63970000000u, 0xA54FB1CCu},
|
||||
{"-1.8014627239033005156e-16", 0xBCA9F63970000000u, 0xA54FB1CBu},
|
||||
{"18014627239033005157e-35", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"180146272390330051569e-36", 0x3CA9F63970000000u, 0x254FB1CBu},
|
||||
{"-0.00000000000000018014627239033005157", 0xBCA9F63970000000u, 0xA54FB1CCu},
|
||||
{"0.000000000000000180146272390330051569803937461", 0x3CA9F63970000000u, 0x254FB1CBu},
|
||||
{"1.80146272390330051569803937462e-16", 0x3CA9F63970000000u, 0x254FB1CCu},
|
||||
{"0.05534819327294826507568359375", 0x3FAC569930000000u, 0x3D62B4CAu},
|
||||
{"-5.534819327294826507568359376e-2", 0xBFAC569930000000u, 0xBD62B4CAu},
|
||||
{"5534819327294826507568359374e-29", 0x3FAC569930000000u, 0x3D62B4C9u},
|
||||
{"-0.0553481932729482650756835937501", 0xBFAC569930000000u, 0xBD62B4CAu},
|
||||
{"5.534819327294826507568359375000000000000000000001e-2", 0x3FAC569930000000u, 0x3D62B4CAu},
|
||||
{"5534819327294826507568359375000000000000000000000000000000e-59", 0x3FAC569930000000u, 0x3D62B4CAu},
|
||||
{"0.055348193272948265", 0x3FAC569930000000u, 0x3D62B4C9u},
|
||||
{"5.5348193272948266e-2", 0x3FAC569930000000u, 0x3D62B4CAu},
|
||||
{"5.534819327294826507e-2", 0x3FAC569930000000u, 0x3D62B4C9u},
|
||||
{"5534819327294826508e-20", 0x3FAC569930000000u, 0x3D62B4CAu},
|
||||
{"55348193272948265075e-21", 0x3FAC569930000000u, 0x3D62B4C9u},
|
||||
{"-0.055348193272948265076", 0xBFAC569930000000u, 0xBD62B4CAu},
|
||||
{"0.0553481932729482650756", 0x3FAC569930000000u, 0x3D62B4C9u},
|
||||
{"-5.53481932729482650757e-2", 0xBFAC569930000000u, 0xBD62B4CAu},
|
||||
{"5.179692133247783258005389047985340416e36", 0x478F2C9450000000u, 0x7C7964A2u},
|
||||
{"5179692133247783258005389047985340417e0", 0x478F2C9450000000u, 0x7C7964A3u},
|
||||
{"5179692133247783258005389047985340415", 0x478F2C9450000000u, 0x7C7964A2u},
|
||||
{"-5.17969213324778325800538904798534041601e36", 0xC78F2C9450000000u, 0xFC7964A3u},
|
||||
{"-5179692133247783258005389047985340416000000000000000000001e-21", 0xC78F2C9450000000u, 0xFC7964A3u},
|
||||
{"-5179692133247783258005389047985340416.000000000000000000000000000000", 0xC78F2C9450000000u, 0xFC7964A2u},
|
||||
{"5.1796921332477832e36", 0x478F2C9450000000u, 0x7C7964A2u},
|
||||
{"51796921332477833e20", 0x478F2C9450000000u, 0x7C7964A3u},
|
||||
{"-5179692133247783258e18", 0xC78F2C9450000000u, 0xFC7964A2u},
|
||||
{"5179692133247783259000000000000000000", 0x478F2C9450000000u, 0x7C7964A3u},
|
||||
{"5179692133247783258000000000000000000", 0x478F2C9450000000u, 0x7C7964A2u},
|
||||
{"5.1796921332477832581e36", 0x478F2C9450000000u, 0x7C7964A3u},
|
||||
{"-5.179692133247783258e36", 0xC78F2C9450000000u, 0xFC7964A2u},
|
||||
{"-517969213324778325801e16", 0xC78F2C9450000000u, 0xFC7964A3u},
|
||||
{"517969213324778325800538904798e7", 0x478F2C9450000000u, 0x7C7964A2u},
|
||||
{"5179692133247783258005389047990000000", 0x478F2C9450000000u, 0x7C7964A3u},
|
||||
{
|
||||
"0.22250738585072011360574097967091319759348195463516456480234261097248222220210769455165295239081350"
|
||||
"8791414915891303962110687008643869459464552765720740782062174337998814106326732925355228688137214901"
|
||||
"2981122451451889849057222307285255133155755015914397476397983411801999323962548289017107081850690630"
|
||||
"6666559949382757725720157630626906633326475653000092458883164330377797918696120494973903778297049050"
|
||||
"5108060994073026293712895895000358379996720725430436028407889577179615094551674824347103070260914462"
|
||||
"1572289880258182545180325707018860872113128079512233426288368622321503775666622503982534335974568884"
|
||||
"4239002654981983854879482922068947216898310996983658468140228542433306603398508864458040010349339704"
|
||||
"2756718644338377048603786162277173854562306587467901408672332763671875e-307", 0x0010000000000000u, 0x00000000u
|
||||
},
|
||||
{
|
||||
"2.22507385850720113605740979670913197593481954635164564802342610972482222202107694551652952390813508"
|
||||
"7914149158913039621106870086438694594645527657207407820621743379988141063267329253552286881372149012"
|
||||
"9811224514518898490572223072852551331557550159143974763979834118019993239625482890171070818506906306"
|
||||
"6665599493827577257201576306269066333264756530000924588831643303777979186961204949739037782970490505"
|
||||
"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
|
||||
+275
-108
@@ -13,15 +13,18 @@
|
||||
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
|
||||
@@ -257,7 +260,7 @@ TEST_CASE("lexer number fast path")
|
||||
"123456789012345678901234567890", // huge -> float
|
||||
"0.30000000000000004", "2.2250738585072014e-308", "1e308",
|
||||
// high-precision / wide-exponent values that exercise the
|
||||
// std::from_chars (Eisel-Lemire) path beyond the Clinger subset
|
||||
// Eisel-Lemire path beyond the Clinger subset
|
||||
"1.7976931348623157e308", "1.2345678901234567e-250",
|
||||
"9007199254740993", "5e-324", "1e-320"
|
||||
};
|
||||
@@ -279,20 +282,18 @@ TEST_CASE("lexer number fast path")
|
||||
}
|
||||
}
|
||||
|
||||
SECTION("significant-digit gate for the Clinger fast path")
|
||||
SECTION("significant digits around Clinger's fast path")
|
||||
{
|
||||
// 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.
|
||||
// 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.
|
||||
const std::vector<std::string> numbers =
|
||||
{
|
||||
"1234567890123456", // 16 significant digits
|
||||
"12345678901234567", // 17 -> attempt skipped
|
||||
"123456789012345678", // 18 -> attempt skipped
|
||||
"12345678901234567", // 17
|
||||
"123456789012345678", // 18
|
||||
"0.1234567890123456", // 16: the leading "0" is not significant
|
||||
"0.12345678901234567", // 17
|
||||
"0.00000000000000001", // 1, in a long token
|
||||
@@ -663,46 +664,145 @@ TEST_CASE("lexer string fast path")
|
||||
}
|
||||
}
|
||||
|
||||
TEST_CASE("parse_float_fast declines what it cannot convert exactly")
|
||||
namespace
|
||||
{
|
||||
// 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)
|
||||
// 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)
|
||||
{
|
||||
return nlohmann::detail::parse_float_fast(s.data(), s.data() + s.size(), out);
|
||||
};
|
||||
double out = 0;
|
||||
if (s[i] == '.')
|
||||
{
|
||||
dot = i;
|
||||
}
|
||||
else if (s[i] == 'e' || s[i] == 'E')
|
||||
{
|
||||
mantissa_end = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return {dot, mantissa_end};
|
||||
}
|
||||
|
||||
#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
|
||||
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);
|
||||
}
|
||||
|
||||
// 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::uint64_t bits_of(double d)
|
||||
{
|
||||
std::uint64_t b = 0;
|
||||
std::memcpy(&b, &d, sizeof(b));
|
||||
return b;
|
||||
}
|
||||
|
||||
// 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));
|
||||
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>());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
namespace
|
||||
@@ -806,40 +906,6 @@ 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")
|
||||
@@ -1237,26 +1303,33 @@ TEST_CASE("Eisel-Lemire float conversion")
|
||||
for (const auto& c : known)
|
||||
{
|
||||
CAPTURE(c.first);
|
||||
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);
|
||||
}
|
||||
CHECK(native_bits64(c.first) == c.second);
|
||||
}
|
||||
}
|
||||
|
||||
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, also with trailing
|
||||
// digits that make the token longer than 19 digits
|
||||
// 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
|
||||
std::uint64_t state = 5295;
|
||||
std::size_t declined = 0;
|
||||
for (int i = 0; i < 200000; ++i)
|
||||
{
|
||||
state ^= state << 13u;
|
||||
@@ -1278,30 +1351,51 @@ 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);
|
||||
double out = 0;
|
||||
REQUIRE(eisel_lemire(token, out));
|
||||
CHECK(bits_of(out) == b);
|
||||
CHECK(native_bits64(token) == b);
|
||||
|
||||
// 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;
|
||||
// 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();
|
||||
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);
|
||||
if (eisel_lemire(longer, out))
|
||||
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)
|
||||
{
|
||||
CHECK(bits_of(out) == b);
|
||||
continue; // infinity or NaN
|
||||
}
|
||||
else
|
||||
if (i % 4 == 0)
|
||||
{
|
||||
// w and w + 1 round differently: only when the value is very
|
||||
// close to a rounding boundary
|
||||
++declined;
|
||||
b &= 0x807FFFFFu; // subnormals
|
||||
}
|
||||
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")
|
||||
@@ -1315,3 +1409,76 @@ 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});
|
||||
}
|
||||
}
|
||||
|
||||
@@ -405,73 +405,3 @@ TEST_CASE("JSON Visit Node")
|
||||
);
|
||||
CHECK(expected.empty());
|
||||
}
|
||||
|
||||
// A custom base class with a const member: copy-constructible (initializing a
|
||||
// const member works fine), but not copy-/move-assignable (assigning one does
|
||||
// not). Used to check that copy construction never requires more than that.
|
||||
struct const_member_base
|
||||
{
|
||||
const int id = 7; // NOLINT(misc-non-private-member-variables-in-classes)
|
||||
};
|
||||
|
||||
using json_with_const_base = nlohmann::basic_json <
|
||||
std::map,
|
||||
std::vector,
|
||||
std::string,
|
||||
bool,
|
||||
std::int64_t,
|
||||
std::uint64_t,
|
||||
double,
|
||||
std::allocator,
|
||||
nlohmann::adl_serializer,
|
||||
std::vector<std::uint8_t>,
|
||||
const_member_base
|
||||
>;
|
||||
|
||||
// build an array nested @a depth levels deep, with the innermost value 1;
|
||||
// every level is constructed (never assigned), since const_member_base does
|
||||
// not support assignment
|
||||
static json_with_const_base make_nested_array(std::size_t depth)
|
||||
{
|
||||
if (depth == 0)
|
||||
{
|
||||
return json_with_const_base(1);
|
||||
}
|
||||
return json_with_const_base::array({make_nested_array(depth - 1)});
|
||||
}
|
||||
|
||||
TEST_CASE("Regression test for issue #5674 - copy construction must not require an assignable base class")
|
||||
{
|
||||
SECTION("depth 0")
|
||||
{
|
||||
// as in the original bug report: copy construction only, no assignment
|
||||
const json_with_const_base j = {1, 2};
|
||||
const json_with_const_base copy = j; // NOLINT(performance-unnecessary-copy-initialization)
|
||||
|
||||
CHECK(copy.size() == 2);
|
||||
CHECK(copy.id == 7);
|
||||
}
|
||||
|
||||
SECTION("nested deeper than the copy constructor's descent bound")
|
||||
{
|
||||
// beyond nesting_depth_limit() (128) levels, the copy constructor
|
||||
// copies without the call stack (copy_iteratively / copy_array_level),
|
||||
// which used to assign the base class of every element it created
|
||||
const std::size_t depth = 300;
|
||||
|
||||
const json_with_const_base j = make_nested_array(depth);
|
||||
const json_with_const_base copy = j; // NOLINT(performance-unnecessary-copy-initialization)
|
||||
|
||||
const json_with_const_base* c = ©
|
||||
for (std::size_t level = 0; level <= depth; ++level)
|
||||
{
|
||||
CAPTURE(level)
|
||||
REQUIRE(c->id == 7);
|
||||
if (level < depth)
|
||||
{
|
||||
c = &c->at(0);
|
||||
}
|
||||
}
|
||||
CHECK(*c == 1);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -257,10 +257,11 @@ struct LocaleSwitchingSax final: public nlohmann::json_sax<json>
|
||||
|
||||
TEST_CASE("locale changes between lexer construction and number conversion (#5198)")
|
||||
{
|
||||
// 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.
|
||||
// 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.
|
||||
const std::vector<std::string> numbers = {"3.14159265358979323846", "1.5e-400", "12.34", "-0.000123456789012345678"};
|
||||
std::string text = "[";
|
||||
for (const auto& n : numbers)
|
||||
@@ -324,7 +325,8 @@ TEST_CASE("locale changes between lexer construction and number conversion (#519
|
||||
}
|
||||
}
|
||||
|
||||
// a long double goes through std::strtold unless std::from_chars supports it
|
||||
// a long double goes through std::strtold unless it is binary64 or
|
||||
// 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
|
||||
@@ -350,8 +352,15 @@ 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 strtod fallback stops early. The
|
||||
// conversion must still terminate rather than retry forever.
|
||||
// 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);
|
||||
|
||||
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)
|
||||
@@ -369,12 +378,20 @@ 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: both reach the strtod fallback
|
||||
// that std::from_chars rejects: double does not depend on the locale
|
||||
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