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+/* -*- 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__ */