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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "util/simple_fraction.h"
#include <cmath>
#include <limits>
#include <vector>
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
#include "util/osp_logging.h"
namespace openscreen {
// static
ErrorOr<SimpleFraction> SimpleFraction::FromString(absl::string_view value) {
std::vector<absl::string_view> fields = absl::StrSplit(value, '/');
if (fields.size() != 1 && fields.size() != 2) {
return Error::Code::kParameterInvalid;
}
int numerator;
int denominator = 1;
if (!absl::SimpleAtoi(fields[0], &numerator)) {
return Error::Code::kParameterInvalid;
}
if (fields.size() == 2) {
if (!absl::SimpleAtoi(fields[1], &denominator)) {
return Error::Code::kParameterInvalid;
}
}
return SimpleFraction{numerator, denominator};
}
std::string SimpleFraction::ToString() const {
if (denominator == 1) {
return std::to_string(numerator);
}
return absl::StrCat(numerator, "/", denominator);
}
bool SimpleFraction::operator==(const SimpleFraction& other) const {
return numerator == other.numerator && denominator == other.denominator;
}
bool SimpleFraction::operator!=(const SimpleFraction& other) const {
return !(*this == other);
}
bool SimpleFraction::is_defined() const {
return denominator != 0;
}
bool SimpleFraction::is_positive() const {
return is_defined() && (numerator >= 0) && (denominator > 0);
}
SimpleFraction::operator double() const {
if (denominator == 0) {
return nan("");
}
return static_cast<double>(numerator) / static_cast<double>(denominator);
}
} // namespace openscreen
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