mirror of
https://github.com/jart/cosmopolitan.git
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78 lines
3.7 KiB
C++
78 lines
3.7 KiB
C++
/*-*-mode:c++;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8-*-│
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│ vi: set et ft=cpp ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/double-conversion/wrapper.h"
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#include "libc/serialize.h"
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#include "libc/str/str.h"
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#include "third_party/double-conversion/double-conversion.h"
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#include "third_party/double-conversion/double-to-string.h"
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namespace double_conversion {
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extern "C" {
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char* DoubleToEcmascript(char buf[128], double x) {
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StringBuilder b(buf, 128);
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const DoubleToStringConverter& dc =
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DoubleToStringConverter::EcmaScriptConverter();
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dc.ToShortest(x, &b);
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return b.Finalize();
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}
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char* DoubleToJson(char buf[128], double x) {
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StringBuilder b(buf, 128);
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static const DoubleToStringConverter kDoubleToJson(
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DoubleToStringConverter::UNIQUE_ZERO |
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DoubleToStringConverter::EMIT_POSITIVE_EXPONENT_SIGN,
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"null", "null", 'e', -6, 21, 6, 0);
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kDoubleToJson.ToShortest(x, &b);
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b.Finalize();
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if (READ32LE(buf) != READ32LE("-nul")) {
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return buf;
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} else {
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return strcpy(buf, "null");
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}
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}
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char* DoubleToLua(char buf[128], double x) {
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static const DoubleToStringConverter kDoubleToLua(
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DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT |
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DoubleToStringConverter::NO_TRAILING_ZERO,
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"math.huge", "0/0", 'e', -6, 21, 6, 0);
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StringBuilder b(buf, 128);
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kDoubleToLua.ToShortest(x, &b);
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return b.Finalize();
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}
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double StringToDouble(const char* s, size_t n, int* out_processed) {
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if (n == -1ull) n = strlen(s);
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int flags = StringToDoubleConverter::ALLOW_CASE_INSENSITIVITY |
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StringToDoubleConverter::ALLOW_LEADING_SPACES |
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StringToDoubleConverter::ALLOW_TRAILING_JUNK |
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StringToDoubleConverter::ALLOW_TRAILING_SPACES;
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StringToDoubleConverter converter(flags, 0.0, 1.0, "Infinity", "NaN");
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int processed;
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double res = converter.StringToDouble(s, n, &processed);
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if (out_processed) {
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*out_processed = processed;
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}
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return res;
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}
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} // extern "C"
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} // namespace double_conversion
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