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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /intl/lwbrk/LineBreaker.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'intl/lwbrk/LineBreaker.h')
-rw-r--r-- | intl/lwbrk/LineBreaker.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/intl/lwbrk/LineBreaker.h b/intl/lwbrk/LineBreaker.h new file mode 100644 index 0000000000..a2d7377474 --- /dev/null +++ b/intl/lwbrk/LineBreaker.h @@ -0,0 +1,82 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ +#ifndef mozilla_intl_LineBreaker_h__ +#define mozilla_intl_LineBreaker_h__ + +#include <cstdint> + +#define NS_LINEBREAKER_NEED_MORE_TEXT -1 + +namespace mozilla { +namespace intl { +enum class LineBreakRule : uint8_t; +enum class WordBreakRule : uint8_t; + +class LineBreaker final { + public: + // LineBreaker is a utility class with only static methods. No need to + // instantiate it. + LineBreaker() = delete; + ~LineBreaker() = delete; + + // Find the next line break opportunity starting from aPos + 1. It can return + // aLen if there's no break opportunity between [aPos + 1, aLen - 1]. + // + // If aPos is already at the end of aText or beyond, i.e. aPos >= aLen, return + // NS_LINEBREAKER_NEED_MORE_TEXT. + // + // DEPRECATED: Use LineBreakIteratorUtf16 instead. + static int32_t Next(const char16_t* aText, uint32_t aLen, uint32_t aPos); + + // Call this on a word with whitespace at either end. We will apply JISx4051 + // rules to find breaks inside the word. aBreakBefore is set to the break- + // before status of each character; aBreakBefore[0] will always be false + // because we never return a break before the first character. + // aLength is the length of the aText array and also the length of the + // aBreakBefore output array. + static void ComputeBreakPositions(const char16_t* aText, uint32_t aLength, + WordBreakRule aWordBreak, + LineBreakRule aLevel, + bool aIsChineseOrJapanese, + uint8_t* aBreakBefore); + static void ComputeBreakPositions(const uint8_t* aText, uint32_t aLength, + WordBreakRule aWordBreak, + LineBreakRule aLevel, + bool aIsChineseOrJapanese, + uint8_t* aBreakBefore); +}; + +static inline bool NS_IsSpace(char16_t u) { + return u == 0x0020 || // SPACE + u == 0x0009 || // CHARACTER TABULATION + u == 0x000D || // CARRIAGE RETURN + (0x2000 <= u && u <= 0x2006) || // EN QUAD, EM QUAD, EN SPACE, + // EM SPACE, THREE-PER-EM SPACE, + // FOUR-PER-SPACE, SIX-PER-EM SPACE, + (0x2008 <= u && u <= 0x200B) || // PUNCTUATION SPACE, THIN SPACE, + // HAIR SPACE, ZERO WIDTH SPACE + u == 0x1361 || // ETHIOPIC WORDSPACE + u == 0x1680 || // OGHAM SPACE MARK + u == 0x205F; // MEDIUM MATHEMATICAL SPACE +} + +static inline bool NS_NeedsPlatformNativeHandling(char16_t aChar) { + return +#if ANDROID || XP_WIN // Bug 1647377/1736393: no "platform native" support for + // Tibetan; better to just use our class-based breaker. + (0x0e01 <= aChar && aChar <= 0x0eff) || // Thai, Lao +#else + // Routing Tibetan to the platform-native breaker currently results in + // WPT failures in a few css3-text-line-break-opclns-* testcases that mix + // a Tibetan character with other-script context. + (0x0e01 <= aChar && aChar <= 0x0fff) || // Thai, Lao, Tibetan +#endif + (0x1780 <= aChar && aChar <= 0x17ff); // Khmer +} + +} // namespace intl +} // namespace mozilla + +#endif /* mozilla_intl_LineBreaker_h__ */ |