forked from mirrors/gecko-dev
54fd961a29
There's no use case for stateful comparators, so they can be just plain function pointers. This is used in some hot places like CSS selector matching. Differential Revision: https://phabricator.services.mozilla.com/D77084
62 lines
2.2 KiB
C++
62 lines
2.2 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsString.h"
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template <typename T>
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int NS_FASTCALL Compare(const mozilla::detail::nsTStringRepr<T>& aLhs,
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const mozilla::detail::nsTStringRepr<T>& aRhs,
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const nsTStringComparator<T> comp) {
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typedef typename nsTSubstring<T>::size_type size_type;
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typedef typename nsTSubstring<T>::const_iterator const_iterator;
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if (&aLhs == &aRhs) {
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return 0;
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}
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const_iterator leftIter, rightIter;
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aLhs.BeginReading(leftIter);
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aRhs.BeginReading(rightIter);
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size_type lLength = aLhs.Length();
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size_type rLength = aRhs.Length();
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size_type lengthToCompare = XPCOM_MIN(lLength, rLength);
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int result;
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if ((result = comp(leftIter.get(), rightIter.get(), lengthToCompare,
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lengthToCompare)) == 0) {
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if (lLength < rLength) {
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result = -1;
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} else if (rLength < lLength) {
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result = 1;
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} else {
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result = 0;
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}
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}
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return result;
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}
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template int NS_FASTCALL Compare<char>(
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mozilla::detail::nsTStringRepr<char> const&,
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mozilla::detail::nsTStringRepr<char> const&, nsTStringComparator<char>);
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template int NS_FASTCALL
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Compare<char16_t>(mozilla::detail::nsTStringRepr<char16_t> const&,
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mozilla::detail::nsTStringRepr<char16_t> const&,
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nsTStringComparator<char16_t>);
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template <typename T>
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int nsTDefaultStringComparator(const T* aLhs, const T* aRhs, uint32_t aLLength,
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uint32_t aRLength) {
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return aLLength == aRLength ? nsCharTraits<T>::compare(aLhs, aRhs, aLLength)
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: (aLLength > aRLength) ? 1 : -1;
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}
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template int nsTDefaultStringComparator(const char*, const char*, uint32_t,
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uint32_t);
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template int nsTDefaultStringComparator(const char16_t*, const char16_t*,
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uint32_t, uint32_t);
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