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15690ec8ce
This fix adds stop at punctuation mode for FindWord for a11y. Also, IS_ASCII is conflict with nsUnicharUtils.h's, so I rename it. Differential Revision: https://phabricator.services.mozilla.com/D188785
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef mozilla_intl_WordBreaker_h__
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#define mozilla_intl_WordBreaker_h__
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#include "nsStringFwd.h"
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#include <cstdint>
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#define NS_WORDBREAKER_NEED_MORE_TEXT -1
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namespace mozilla {
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namespace intl {
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struct WordRange {
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uint32_t mBegin;
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uint32_t mEnd;
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};
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class WordBreaker final {
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public:
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// WordBreaker is a utility class with only static methods. No need to
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// instantiate it.
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WordBreaker() = delete;
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~WordBreaker() = delete;
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// Find the word boundary by scanning forward and backward from aPos.
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//
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// @return WordRange where mBegin equals to the offset to first character in
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// the word and mEnd equals to the offset to the last character plus 1. mEnd
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// can be aText.Lengh() if the desired word is at the end of aText.
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//
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// If aPos is already at the end of aText or beyond, both mBegin and mEnd
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// equals to aText.Length().
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//
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// If setting StopAtPunctuation, even if using UAX#29 word segmenter rule,
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// there will be break opportunities on characters with punctuation class.
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enum class FindWordOptions { None, StopAtPunctuation };
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static WordRange FindWord(
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const nsAString& aText, uint32_t aPos,
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const FindWordOptions aOptions = FindWordOptions::None);
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// Find the next word break opportunity starting from aPos + 1. It can return
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// aLen if there's no break opportunity between [aPos + 1, aLen - 1].
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//
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// If aPos is already at the end of aText or beyond, i.e. aPos >= aLen, return
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// NS_WORDBREAKER_NEED_MORE_TEXT.
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//
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// DEPRECATED: Use WordBreakIteratorUtf16 instead.
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static int32_t Next(const char16_t* aText, uint32_t aLen, uint32_t aPos);
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private:
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enum WordBreakClass : uint8_t {
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kWbClassSpace = 0,
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kWbClassAlphaLetter,
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kWbClassPunct,
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kWbClassHanLetter,
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kWbClassKatakanaLetter,
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kWbClassHiraganaLetter,
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kWbClassHWKatakanaLetter,
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kWbClassScriptioContinua
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};
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static WordBreakClass GetClass(char16_t aChar);
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};
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} // namespace intl
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} // namespace mozilla
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#endif /* mozilla_intl_WordBreaker_h__ */
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