151 lines
4.1 KiB
C++
151 lines
4.1 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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#include "nsSampleWordBreaker.h"
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nsSampleWordBreaker::nsSampleWordBreaker()
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{
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}
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nsSampleWordBreaker::~nsSampleWordBreaker()
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{
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}
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NS_IMPL_ISUPPORTS(nsSampleWordBreaker, nsIWordBreaker)
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bool nsSampleWordBreaker::BreakInBetween(
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const char16_t* aText1 , uint32_t aTextLen1,
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const char16_t* aText2 , uint32_t aTextLen2)
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{
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NS_PRECONDITION( nullptr != aText1, "null ptr");
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NS_PRECONDITION( nullptr != aText2, "null ptr");
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if(!aText1 || !aText2 || (0 == aTextLen1) || (0 == aTextLen2))
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return false;
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return (this->GetClass(aText1[aTextLen1-1]) != this->GetClass(aText2[0]));
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}
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#define IS_ASCII(c) (0 == ( 0xFF80 & (c)))
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#define ASCII_IS_ALPHA(c) ((( 'a' <= (c)) && ((c) <= 'z')) || (( 'A' <= (c)) && ((c) <= 'Z')))
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#define ASCII_IS_DIGIT(c) (( '0' <= (c)) && ((c) <= '9'))
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#define ASCII_IS_SPACE(c) (( ' ' == (c)) || ( '\t' == (c)) || ( '\r' == (c)) || ( '\n' == (c)))
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#define IS_ALPHABETICAL_SCRIPT(c) ((c) < 0x2E80)
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// we change the beginning of IS_HAN from 0x4e00 to 0x3400 to relfect Unicode 3.0
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#define IS_HAN(c) (( 0x3400 <= (c)) && ((c) <= 0x9fff))||(( 0xf900 <= (c)) && ((c) <= 0xfaff))
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#define IS_KATAKANA(c) (( 0x30A0 <= (c)) && ((c) <= 0x30FF))
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#define IS_HIRAGANA(c) (( 0x3040 <= (c)) && ((c) <= 0x309F))
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#define IS_HALFWIDTHKATAKANA(c) (( 0xFF60 <= (c)) && ((c) <= 0xFF9F))
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#define IS_THAI(c) (0x0E00 == (0xFF80 & (c) )) // Look at the higest 9 bits
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uint8_t nsSampleWordBreaker::GetClass(char16_t c)
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{
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// begin of the hack
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if (IS_ALPHABETICAL_SCRIPT(c)) {
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if(IS_ASCII(c)) {
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if(ASCII_IS_SPACE(c)) {
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return kWbClassSpace;
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} else if(ASCII_IS_ALPHA(c) || ASCII_IS_DIGIT(c)) {
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return kWbClassAlphaLetter;
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} else {
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return kWbClassPunct;
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}
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} else if(IS_THAI(c)) {
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return kWbClassThaiLetter;
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} else if (c == 0x00A0/*NBSP*/) {
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return kWbClassSpace;
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} else {
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return kWbClassAlphaLetter;
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}
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} else {
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if(IS_HAN(c)) {
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return kWbClassHanLetter;
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} else if(IS_KATAKANA(c)) {
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return kWbClassKatakanaLetter;
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} else if(IS_HIRAGANA(c)) {
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return kWbClassHiraganaLetter;
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} else if(IS_HALFWIDTHKATAKANA(c)) {
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return kWbClassHWKatakanaLetter;
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} else {
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return kWbClassAlphaLetter;
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}
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}
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return 0;
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}
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nsWordRange nsSampleWordBreaker::FindWord(
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const char16_t* aText , uint32_t aTextLen,
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uint32_t aOffset)
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{
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nsWordRange range;
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NS_PRECONDITION( nullptr != aText, "null ptr");
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NS_PRECONDITION( 0 != aTextLen, "len = 0");
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NS_PRECONDITION( aOffset <= aTextLen, "aOffset > aTextLen");
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range.mBegin = aTextLen + 1;
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range.mEnd = aTextLen + 1;
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if(!aText || aOffset > aTextLen)
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return range;
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uint8_t c = this->GetClass(aText[aOffset]);
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uint32_t i;
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// Scan forward
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range.mEnd--;
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for(i = aOffset +1;i <= aTextLen; i++)
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{
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if( c != this->GetClass(aText[i]))
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{
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range.mEnd = i;
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break;
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}
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}
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// Scan backward
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range.mBegin = 0;
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for(i = aOffset ;i > 0; i--)
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{
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if( c != this->GetClass(aText[i-1]))
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{
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range.mBegin = i;
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break;
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}
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}
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if(kWbClassThaiLetter == c)
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{
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// need to call Thai word breaker from here
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// we should pass the whole Thai segment to the thai word breaker to find a shorter answer
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}
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return range;
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}
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int32_t nsSampleWordBreaker::NextWord(
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const char16_t* aText, uint32_t aLen, uint32_t aPos)
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{
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int8_t c1, c2;
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uint32_t cur = aPos;
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if (cur == aLen)
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return NS_WORDBREAKER_NEED_MORE_TEXT;
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c1 = this->GetClass(aText[cur]);
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for(cur++; cur <aLen; cur++)
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{
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c2 = this->GetClass(aText[cur]);
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if(c2 != c1)
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break;
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}
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if(kWbClassThaiLetter == c1)
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{
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// need to call Thai word breaker from here
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// we should pass the whole Thai segment to the thai word breaker to find a shorter answer
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}
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if (cur == aLen)
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return NS_WORDBREAKER_NEED_MORE_TEXT;
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return cur;
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}
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