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