mirror of
https://github.com/mozilla/gecko-dev.git
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274 lines
9.9 KiB
C++
274 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsTStringRepr.h"
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#include "double-conversion/string-to-double.h"
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#include "mozilla/FloatingPoint.h"
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#include "nsError.h"
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#include "nsString.h"
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namespace mozilla::detail {
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template <typename T>
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typename nsTStringRepr<T>::char_type nsTStringRepr<T>::First() const {
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MOZ_RELEASE_ASSERT(this->mLength > 0, "|First()| called on an empty string");
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return this->mData[0];
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}
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template <typename T>
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typename nsTStringRepr<T>::char_type nsTStringRepr<T>::Last() const {
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MOZ_RELEASE_ASSERT(this->mLength > 0, "|Last()| called on an empty string");
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return this->mData[this->mLength - 1];
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const self_type& aStr) const {
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return this->mLength == aStr.mLength &&
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char_traits::compare(this->mData, aStr.mData, this->mLength) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const self_type& aStr,
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comparator_type aComp) const {
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return this->mLength == aStr.mLength &&
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aComp(this->mData, aStr.mData, this->mLength, aStr.mLength) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const substring_tuple_type& aTuple) const {
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return Equals(substring_type(aTuple));
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const substring_tuple_type& aTuple,
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comparator_type aComp) const {
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return Equals(substring_type(aTuple), aComp);
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const char_type* aData) const {
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// unfortunately, some callers pass null :-(
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if (!aData) {
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MOZ_ASSERT_UNREACHABLE("null data pointer");
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return this->mLength == 0;
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}
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// XXX avoid length calculation?
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size_type length = char_traits::length(aData);
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return this->mLength == length &&
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char_traits::compare(this->mData, aData, this->mLength) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::Equals(const char_type* aData,
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comparator_type aComp) const {
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// unfortunately, some callers pass null :-(
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if (!aData) {
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MOZ_ASSERT_UNREACHABLE("null data pointer");
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return this->mLength == 0;
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}
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// XXX avoid length calculation?
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size_type length = char_traits::length(aData);
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return this->mLength == length &&
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aComp(this->mData, aData, this->mLength, length) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::EqualsASCII(const char* aData, size_type aLen) const {
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return this->mLength == aLen &&
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char_traits::compareASCII(this->mData, aData, aLen) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::EqualsASCII(const char* aData) const {
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return char_traits::compareASCIINullTerminated(this->mData, this->mLength,
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aData) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::EqualsLatin1(const char* aData,
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const size_type aLength) const {
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return (this->mLength == aLength) &&
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char_traits::equalsLatin1(this->mData, aData, aLength);
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}
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template <typename T>
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bool nsTStringRepr<T>::LowerCaseEqualsASCII(const char* aData,
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size_type aLen) const {
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return this->mLength == aLen &&
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char_traits::compareLowerCaseToASCII(this->mData, aData, aLen) == 0;
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}
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template <typename T>
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bool nsTStringRepr<T>::LowerCaseEqualsASCII(const char* aData) const {
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return char_traits::compareLowerCaseToASCIINullTerminated(
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this->mData, this->mLength, aData) == 0;
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}
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template <typename T>
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int32_t nsTStringRepr<T>::Find(const string_view& aString,
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index_type aOffset) const {
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auto idx = View().find(aString, aOffset);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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int32_t nsTStringRepr<T>::LowerCaseFindASCII(const std::string_view& aString,
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index_type aOffset) const {
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if (aOffset > Length()) {
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return kNotFound;
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}
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auto begin = BeginReading();
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auto end = EndReading();
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auto it =
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std::search(begin + aOffset, end, aString.begin(), aString.end(),
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[](char_type l, char r) {
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MOZ_ASSERT(!(r & ~0x7F), "Unexpected non-ASCII character");
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MOZ_ASSERT(char_traits::ASCIIToLower(r) == char_type(r),
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"Search string must be ASCII lowercase");
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return char_traits::ASCIIToLower(l) == char_type(r);
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});
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return it == end ? kNotFound : std::distance(begin, it);
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}
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template <typename T>
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int32_t nsTStringRepr<T>::RFind(const string_view& aString) const {
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auto idx = View().rfind(aString);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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typename nsTStringRepr<T>::size_type nsTStringRepr<T>::CountChar(
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char_type aChar) const {
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return std::count(BeginReading(), EndReading(), aChar);
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}
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template <typename T>
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int32_t nsTStringRepr<T>::FindChar(char_type aChar, index_type aOffset) const {
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auto idx = View().find(aChar, aOffset);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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int32_t nsTStringRepr<T>::RFindChar(char_type aChar, int32_t aOffset) const {
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auto idx = View().rfind(aChar, aOffset != -1 ? aOffset : string_view::npos);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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int32_t nsTStringRepr<T>::FindCharInSet(const string_view& aSet,
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index_type aOffset) const {
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auto idx = View().find_first_of(aSet, aOffset);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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int32_t nsTStringRepr<T>::RFindCharInSet(const string_view& aSet,
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int32_t aOffset) const {
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auto idx =
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View().find_last_of(aSet, aOffset != -1 ? aOffset : string_view::npos);
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return idx == string_view::npos ? kNotFound : idx;
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}
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template <typename T>
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bool nsTStringRepr<T>::EqualsIgnoreCase(const std::string_view& aString) const {
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return std::equal(BeginReading(), EndReading(), aString.begin(),
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aString.end(), [](char_type l, char r) {
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return char_traits::ASCIIToLower(l) ==
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char_traits::ASCIIToLower(char_type(r));
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});
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}
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// We can't use the method `StringToDoubleConverter::ToDouble` due to linking
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// issues on Windows as it's in mozglue. Instead, implement the selection logic
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// using an overload set.
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//
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// StringToFloat is used instead of StringToDouble for floats due to differences
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// in rounding behaviour.
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static void StringToFP(
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const double_conversion::StringToDoubleConverter& aConverter,
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const char* aData, size_t aLength, int* aProcessed, float* aResult) {
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*aResult = aConverter.StringToFloat(aData, aLength, aProcessed);
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}
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static void StringToFP(
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const double_conversion::StringToDoubleConverter& aConverter,
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const char* aData, size_t aLength, int* aProcessed, double* aResult) {
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*aResult = aConverter.StringToDouble(aData, aLength, aProcessed);
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}
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static void StringToFP(
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const double_conversion::StringToDoubleConverter& aConverter,
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const char16_t* aData, size_t aLength, int* aProcessed, float* aResult) {
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*aResult = aConverter.StringToFloat(reinterpret_cast<const uc16*>(aData),
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aLength, aProcessed);
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}
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static void StringToFP(
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const double_conversion::StringToDoubleConverter& aConverter,
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const char16_t* aData, size_t aLength, int* aProcessed, double* aResult) {
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*aResult = aConverter.StringToDouble(reinterpret_cast<const uc16*>(aData),
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aLength, aProcessed);
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}
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template <typename FloatT, typename CharT>
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static FloatT ParseFloatingPoint(const nsTStringRepr<CharT>& aString,
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bool aAllowTrailingChars,
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nsresult* aErrorCode) {
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// Performs conversion to double following the "rules for parsing
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// floating-point number values" from the HTML standard.
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// https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#rules-for-parsing-floating-point-number-values
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//
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// This behaviour allows for leading spaces, and will not generate infinity or
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// NaN values except in error conditions.
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int flags = double_conversion::StringToDoubleConverter::ALLOW_LEADING_SPACES;
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if (aAllowTrailingChars) {
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flags |= double_conversion::StringToDoubleConverter::ALLOW_TRAILING_JUNK;
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}
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double_conversion::StringToDoubleConverter converter(
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flags, mozilla::UnspecifiedNaN<double>(),
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mozilla::UnspecifiedNaN<double>(), nullptr, nullptr);
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FloatT result;
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int processed;
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StringToFP(converter, aString.Data(), aString.Length(), &processed, &result);
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*aErrorCode = std::isfinite(result) ? NS_OK : NS_ERROR_ILLEGAL_VALUE;
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return result;
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}
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template <typename T>
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double nsTStringRepr<T>::ToDouble(nsresult* aErrorCode) const {
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return ParseFloatingPoint<double, T>(*this, /* aAllowTrailingChars */ false,
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aErrorCode);
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}
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template <typename T>
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double nsTStringRepr<T>::ToDoubleAllowTrailingChars(
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nsresult* aErrorCode) const {
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return ParseFloatingPoint<double, T>(*this, /* aAllowTrailingChars */ true,
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aErrorCode);
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}
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template <typename T>
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float nsTStringRepr<T>::ToFloat(nsresult* aErrorCode) const {
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return ParseFloatingPoint<float, T>(*this, /* aAllowTrailingChars */ false,
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aErrorCode);
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}
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template <typename T>
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float nsTStringRepr<T>::ToFloatAllowTrailingChars(nsresult* aErrorCode) const {
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return ParseFloatingPoint<float, T>(*this, /* aAllowTrailingChars */ true,
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aErrorCode);
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}
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} // namespace mozilla::detail
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template class mozilla::detail::nsTStringRepr<char>;
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template class mozilla::detail::nsTStringRepr<char16_t>;
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