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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#define FASTFLOAT_ALLOWS_LEADING_PLUS 1
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/value_parsing.h"
#include <string>
#include <utility>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/float16.h"
#include "contrib/restricted/fast_float/include/fast_float/fast_float.h"
using arrow20::util::Float16;
namespace arrow20 {
namespace internal {
bool StringToFloat(const char* s, size_t length, char decimal_point, float* out) {
fast_float::parse_options options{
fast_float::chars_format::general, decimal_point};
const auto res =
fast_float::from_chars_advanced(s, s + length, *out, options);
return res.ec == std::errc() && res.ptr == s + length;
}
bool StringToFloat(const char* s, size_t length, char decimal_point, double* out) {
fast_float::parse_options options{
fast_float::chars_format::general, decimal_point};
const auto res =
fast_float::from_chars_advanced(s, s + length, *out, options);
return res.ec == std::errc() && res.ptr == s + length;
}
// Half float
bool StringToFloat(const char* s, size_t length, char decimal_point, uint16_t* out) {
fast_float::parse_options options{
fast_float::chars_format::general, decimal_point};
float temp_out;
const auto res =
fast_float::from_chars_advanced(s, s + length, temp_out, options);
const bool ok = res.ec == std::errc() && res.ptr == s + length;
if (ok) {
*out = Float16::FromFloat(temp_out).bits();
}
return ok;
}
// ----------------------------------------------------------------------
// strptime-like parsing
namespace {
class StrptimeTimestampParser : public TimestampParser {
public:
explicit StrptimeTimestampParser(std::string format)
: format_(std::move(format)), have_zone_offset_(false) {
// Check for use of %z
size_t cur = 0;
while (cur < format_.size()) {
if (format_[cur] == '%') {
if (cur + 1 < format_.size() && format_[cur + 1] == 'z') {
have_zone_offset_ = true;
break;
}
cur++;
}
cur++;
}
}
bool operator()(const char* s, size_t length, TimeUnit::type out_unit, int64_t* out,
bool* out_zone_offset_present = NULLPTR) const override {
if (out_zone_offset_present) {
*out_zone_offset_present = have_zone_offset_;
}
return ParseTimestampStrptime(s, length, format_.c_str(),
/*ignore_time_in_day=*/false,
/*allow_trailing_chars=*/false, out_unit, out);
}
const char* kind() const override { return "strptime"; }
const char* format() const override { return format_.c_str(); }
private:
std::string format_;
bool have_zone_offset_;
};
class ISO8601Parser : public TimestampParser {
public:
ISO8601Parser() {}
bool operator()(const char* s, size_t length, TimeUnit::type out_unit, int64_t* out,
bool* out_zone_offset_present = NULLPTR) const override {
return ParseTimestampISO8601(s, length, out_unit, out, out_zone_offset_present);
}
const char* kind() const override { return "iso8601"; }
};
} // namespace
} // namespace internal
const char* TimestampParser::format() const { return ""; }
std::shared_ptr<TimestampParser> TimestampParser::MakeStrptime(std::string format) {
return std::make_shared<internal::StrptimeTimestampParser>(std::move(format));
}
std::shared_ptr<TimestampParser> TimestampParser::MakeISO8601() {
return std::make_shared<internal::ISO8601Parser>();
}
} // namespace arrow20
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