gecko-dev/intl/lwbrk/WordBreaker.cpp

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

144 строки
4.4 KiB
C++
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 15:12:37 +04:00
/* 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/. */
#include "mozilla/intl/WordBreaker.h"
#include "mozilla/Preferences.h"
using mozilla::intl::WordBreakClass;
using mozilla::intl::WordBreaker;
using mozilla::intl::WordRange;
/*static*/
already_AddRefed<WordBreaker> WordBreaker::Create() {
return RefPtr<WordBreaker>(new WordBreaker()).forget();
1999-02-10 02:56:05 +03:00
}
bool WordBreaker::BreakInBetween(const char16_t* aText1, uint32_t aTextLen1,
const char16_t* aText2, uint32_t aTextLen2) {
MOZ_ASSERT(nullptr != aText1, "null ptr");
MOZ_ASSERT(nullptr != aText2, "null ptr");
if (!aText1 || !aText2 || (0 == aTextLen1) || (0 == aTextLen2)) return false;
return GetClass(aText1[aTextLen1 - 1]) != GetClass(aText2[0]);
}
1999-08-24 10:35:32 +04:00
#define IS_ASCII(c) (0 == (0xFF80 & (c)))
#define ASCII_IS_ALPHA(c) \
((('a' <= (c)) && ((c) <= 'z')) || (('A' <= (c)) && ((c) <= 'Z')))
#define ASCII_IS_DIGIT(c) (('0' <= (c)) && ((c) <= '9'))
#define ASCII_IS_SPACE(c) \
((' ' == (c)) || ('\t' == (c)) || ('\r' == (c)) || ('\n' == (c)))
#define IS_ALPHABETICAL_SCRIPT(c) ((c) < 0x2E80)
// we change the beginning of IS_HAN from 0x4e00 to 0x3400 to relfect
// Unicode 3.0
1999-08-24 10:35:32 +04:00
#define IS_HAN(c) \
((0x3400 <= (c)) && ((c) <= 0x9fff)) || ((0xf900 <= (c)) && ((c) <= 0xfaff))
#define IS_KATAKANA(c) ((0x30A0 <= (c)) && ((c) <= 0x30FF))
#define IS_HIRAGANA(c) ((0x3040 <= (c)) && ((c) <= 0x309F))
1999-08-24 10:35:32 +04:00
#define IS_HALFWIDTHKATAKANA(c) ((0xFF60 <= (c)) && ((c) <= 0xFF9F))
#define IS_THAI(c) (0x0E00 == (0xFF80 & (c))) // Look at the higest 9 bits
/* static */
WordBreakClass WordBreaker::GetClass(char16_t c) {
// The pref is cached on first call; changes will require a browser restart.
static bool sStopAtUnderscore =
Preferences::GetBool("layout.word_select.stop_at_underscore", false);
// begin of the hack
1999-08-24 10:35:32 +04:00
if (IS_ALPHABETICAL_SCRIPT(c)) {
if (IS_ASCII(c)) {
if (ASCII_IS_SPACE(c)) {
return kWbClassSpace;
} else if (ASCII_IS_ALPHA(c) || ASCII_IS_DIGIT(c) ||
(c == '_' && !sStopAtUnderscore)) {
1999-08-24 10:35:32 +04:00
return kWbClassAlphaLetter;
} else {
return kWbClassPunct;
}
} else if (IS_THAI(c)) {
return kWbClassThaiLetter;
} else if (c == 0x00A0 /*NBSP*/) {
return kWbClassSpace;
} else {
1999-08-24 10:35:32 +04:00
return kWbClassAlphaLetter;
}
} else {
if (IS_HAN(c)) {
return kWbClassHanLetter;
} else if (IS_KATAKANA(c)) {
return kWbClassKatakanaLetter;
} else if (IS_HIRAGANA(c)) {
return kWbClassHiraganaLetter;
} else if (IS_HALFWIDTHKATAKANA(c)) {
return kWbClassHWKatakanaLetter;
} else {
return kWbClassAlphaLetter;
}
}
return static_cast<WordBreakClass>(0);
}
WordRange WordBreaker::FindWord(const char16_t* aText, uint32_t aTextLen,
uint32_t aOffset) {
WordRange range;
MOZ_ASSERT(nullptr != aText, "null ptr");
MOZ_ASSERT(0 != aTextLen, "len = 0");
MOZ_ASSERT(aOffset <= aTextLen, "aOffset > aTextLen");
range.mBegin = aTextLen + 1;
range.mEnd = aTextLen + 1;
if (!aText || aOffset > aTextLen) return range;
WordBreakClass c = GetClass(aText[aOffset]);
uint32_t i;
// Scan forward
range.mEnd--;
for (i = aOffset + 1; i <= aTextLen; i++) {
if (c != GetClass(aText[i])) {
range.mEnd = i;
break;
}
}
// Scan backward
range.mBegin = 0;
for (i = aOffset; i > 0; i--) {
if (c != GetClass(aText[i - 1])) {
range.mBegin = i;
break;
}
}
1999-08-24 10:35:32 +04:00
if (kWbClassThaiLetter == c) {
// need to call Thai word breaker from here
// we should pass the whole Thai segment to the thai word breaker to find a
// shorter answer
}
return range;
}
int32_t WordBreaker::NextWord(const char16_t* aText, uint32_t aLen,
uint32_t aPos) {
WordBreakClass c1, c2;
uint32_t cur = aPos;
if (cur == aLen) return NS_WORDBREAKER_NEED_MORE_TEXT;
c1 = GetClass(aText[cur]);
for (cur++; cur < aLen; cur++) {
c2 = GetClass(aText[cur]);
if (c2 != c1) break;
1999-02-16 21:11:14 +03:00
}
1999-08-24 10:35:32 +04:00
if (kWbClassThaiLetter == c1) {
// need to call Thai word breaker from here
// we should pass the whole Thai segment to the thai word breaker to find a
// shorter answer
}
if (cur == aLen) return NS_WORDBREAKER_NEED_MORE_TEXT;
return cur;
}