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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 "nscore.h"
#include "nsISupports.h"
#define NS_LINEBREAKER_NEED_MORE_TEXT -1
namespace mozilla {
namespace intl {
class LineBreaker {
public:
NS_INLINE_DECL_REFCOUNTING(LineBreaker)
enum class WordBreak : uint8_t {
Normal = 0, // default
BreakAll = 1, // break all
KeepAll = 2 // always keep
};
enum class Strictness : uint8_t {
Auto = 0,
Loose = 1,
Normal = 2,
Strict = 3,
Anywhere = 4
};
static already_AddRefed<LineBreaker> Create();
int32_t Next(const char16_t* aText, uint32_t aLen, uint32_t aPos);
int32_t Prev(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.
void GetJISx4051Breaks(const char16_t* aText, uint32_t aLength,
WordBreak aWordBreak, Strictness aLevel,
bool aIsChineseOrJapanese, uint8_t* aBreakBefore);
void GetJISx4051Breaks(const uint8_t* aText, uint32_t aLength,
WordBreak aWordBreak, Strictness aLevel,
bool aIsChineseOrJapanese, uint8_t* aBreakBefore);
private:
~LineBreaker() = default;
int32_t WordMove(const char16_t* aText, uint32_t aLen, uint32_t aPos,
int8_t aDirection);
};
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 // Bug 1647377: no "platform native" support for Tibetan;
// better to just use our class-based breaker.
(0x0e01 <= aChar && aChar <= 0x0eff) || // Thai, Lao
#else
(0x0e01 <= aChar && aChar <= 0x0fff) || // Thai, Lao, Tibetan
#endif
(0x1780 <= aChar && aChar <= 0x17ff); // Khmer
}
} // namespace intl
} // namespace mozilla
#endif /* mozilla_intl_LineBreaker_h__ */
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