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