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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "parse_utils.h"
#include <vespa/vespalib/locale/c.h>
#include <charconv>
#include <limits>
namespace document::select::util {
// Note: these parsers are all pure, reentrant and without locking.
bool
parse_hex_i64(const char* str, size_t len, int64_t& out) {
// Legacy parser parses hex numbers as u64 rather than i64 (then implicitly
// converts), so we do the same thing here to avoid change of semantics.
uint64_t val = out;
auto res = std::from_chars(str, str+len, val, 16);
out = val;
return (res.ec == std::errc()) && (res.ptr == str+len);
}
bool
parse_i64(const char* str, size_t len, int64_t& out) {
auto res = std::from_chars(str, str+len, out, 10);
return (res.ec == std::errc()) && (res.ptr == str+len);
}
bool
parse_double(const char* str, size_t len, double& out) {
#if defined(_LIBCPP_VERSION) && _LIBCPP_VERSION < 180000
// Temporary workaround that also handles underflow (cf. issue 3081)
// until libc++ supports std::from_chars for double
char *str_end = const_cast<char*>(str) + len;
double out0 = vespalib::locale::c::strtod_au(str, &str_end);
if (str_end != str + len) {
return false;
}
out = out0;
return true;
#else
auto res = std::from_chars(str, str+len, out);
if (res.ec == std::errc::result_out_of_range) {
out = (str[0] == '-')
? -std::numeric_limits<double>::infinity()
: std::numeric_limits<double>::infinity();
return true;
}
return (res.ec == std::errc()) && (res.ptr == str+len);
#endif
}
}
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