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intl/lwbrk/src/nsSampleWordBreaker.cpp@6474c204b198 (annotated)

intl/lwbrk/src/nsSampleWordBreaker.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6
michael@0	7	#include "nsSampleWordBreaker.h"
michael@0	8
michael@0	9	nsSampleWordBreaker::nsSampleWordBreaker()
michael@0	10	{
michael@0	11	}
michael@0	12	nsSampleWordBreaker::~nsSampleWordBreaker()
michael@0	13	{
michael@0	14	}
michael@0	15
michael@0	16	NS_IMPL_ISUPPORTS(nsSampleWordBreaker, nsIWordBreaker)
michael@0	17
michael@0	18	bool nsSampleWordBreaker::BreakInBetween(
michael@0	19	const char16_t* aText1 , uint32_t aTextLen1,
michael@0	20	const char16_t* aText2 , uint32_t aTextLen2)
michael@0	21	{
michael@0	22	NS_PRECONDITION( nullptr != aText1, "null ptr");
michael@0	23	NS_PRECONDITION( nullptr != aText2, "null ptr");
michael@0	24
michael@0	25	if(!aText1 || !aText2 || (0 == aTextLen1) || (0 == aTextLen2))
michael@0	26	return false;
michael@0	27
michael@0	28	return (this->GetClass(aText1[aTextLen1-1]) != this->GetClass(aText2[0]));
michael@0	29	}
michael@0	30
michael@0	31
michael@0	32	#define IS_ASCII(c) (0 == ( 0xFF80 & (c)))
michael@0	33	#define ASCII_IS_ALPHA(c) ((( 'a' <= (c)) && ((c) <= 'z')) || (( 'A' <= (c)) && ((c) <= 'Z')))
michael@0	34	#define ASCII_IS_DIGIT(c) (( '0' <= (c)) && ((c) <= '9'))
michael@0	35	#define ASCII_IS_SPACE(c) (( ' ' == (c)) || ( '\t' == (c)) || ( '\r' == (c)) || ( '\n' == (c)))
michael@0	36	#define IS_ALPHABETICAL_SCRIPT(c) ((c) < 0x2E80)
michael@0	37
michael@0	38	// we change the beginning of IS_HAN from 0x4e00 to 0x3400 to relfect Unicode 3.0
michael@0	39	#define IS_HAN(c) (( 0x3400 <= (c)) && ((c) <= 0x9fff))||(( 0xf900 <= (c)) && ((c) <= 0xfaff))
michael@0	40	#define IS_KATAKANA(c) (( 0x30A0 <= (c)) && ((c) <= 0x30FF))
michael@0	41	#define IS_HIRAGANA(c) (( 0x3040 <= (c)) && ((c) <= 0x309F))
michael@0	42	#define IS_HALFWIDTHKATAKANA(c) (( 0xFF60 <= (c)) && ((c) <= 0xFF9F))
michael@0	43	#define IS_THAI(c) (0x0E00 == (0xFF80 & (c) )) // Look at the higest 9 bits
michael@0	44
michael@0	45	uint8_t nsSampleWordBreaker::GetClass(char16_t c)
michael@0	46	{
michael@0	47	// begin of the hack
michael@0	48
michael@0	49	if (IS_ALPHABETICAL_SCRIPT(c)) {
michael@0	50	if(IS_ASCII(c)) {
michael@0	51	if(ASCII_IS_SPACE(c)) {
michael@0	52	return kWbClassSpace;
michael@0	53	} else if(ASCII_IS_ALPHA(c) || ASCII_IS_DIGIT(c)) {
michael@0	54	return kWbClassAlphaLetter;
michael@0	55	} else {
michael@0	56	return kWbClassPunct;
michael@0	57	}
michael@0	58	} else if(IS_THAI(c)) {
michael@0	59	return kWbClassThaiLetter;
michael@0	60	} else if (c == 0x00A0/*NBSP*/) {
michael@0	61	return kWbClassSpace;
michael@0	62	} else {
michael@0	63	return kWbClassAlphaLetter;
michael@0	64	}
michael@0	65	} else {
michael@0	66	if(IS_HAN(c)) {
michael@0	67	return kWbClassHanLetter;
michael@0	68	} else if(IS_KATAKANA(c)) {
michael@0	69	return kWbClassKatakanaLetter;
michael@0	70	} else if(IS_HIRAGANA(c)) {
michael@0	71	return kWbClassHiraganaLetter;
michael@0	72	} else if(IS_HALFWIDTHKATAKANA(c)) {
michael@0	73	return kWbClassHWKatakanaLetter;
michael@0	74	} else {
michael@0	75	return kWbClassAlphaLetter;
michael@0	76	}
michael@0	77	}
michael@0	78	return 0;
michael@0	79	}
michael@0	80
michael@0	81	nsWordRange nsSampleWordBreaker::FindWord(
michael@0	82	const char16_t* aText , uint32_t aTextLen,
michael@0	83	uint32_t aOffset)
michael@0	84	{
michael@0	85	nsWordRange range;
michael@0	86	NS_PRECONDITION( nullptr != aText, "null ptr");
michael@0	87	NS_PRECONDITION( 0 != aTextLen, "len = 0");
michael@0	88	NS_PRECONDITION( aOffset <= aTextLen, "aOffset > aTextLen");
michael@0	89
michael@0	90	range.mBegin = aTextLen + 1;
michael@0	91	range.mEnd = aTextLen + 1;
michael@0	92
michael@0	93	if(!aText || aOffset > aTextLen)
michael@0	94	return range;
michael@0	95
michael@0	96	uint8_t c = this->GetClass(aText[aOffset]);
michael@0	97	uint32_t i;
michael@0	98	// Scan forward
michael@0	99	range.mEnd--;
michael@0	100	for(i = aOffset +1;i <= aTextLen; i++)
michael@0	101	{
michael@0	102	if( c != this->GetClass(aText[i]))
michael@0	103	{
michael@0	104	range.mEnd = i;
michael@0	105	break;
michael@0	106	}
michael@0	107	}
michael@0	108
michael@0	109	// Scan backward
michael@0	110	range.mBegin = 0;
michael@0	111	for(i = aOffset ;i > 0; i--)
michael@0	112	{
michael@0	113	if( c != this->GetClass(aText[i-1]))
michael@0	114	{
michael@0	115	range.mBegin = i;
michael@0	116	break;
michael@0	117	}
michael@0	118	}
michael@0	119	if(kWbClassThaiLetter == c)
michael@0	120	{
michael@0	121	// need to call Thai word breaker from here
michael@0	122	// we should pass the whole Thai segment to the thai word breaker to find a shorter answer
michael@0	123	}
michael@0	124	return range;
michael@0	125	}
michael@0	126
michael@0	127	int32_t nsSampleWordBreaker::NextWord(
michael@0	128	const char16_t* aText, uint32_t aLen, uint32_t aPos)
michael@0	129	{
michael@0	130	int8_t c1, c2;
michael@0	131	uint32_t cur = aPos;
michael@0	132	if (cur == aLen)
michael@0	133	return NS_WORDBREAKER_NEED_MORE_TEXT;
michael@0	134	c1 = this->GetClass(aText[cur]);
michael@0	135
michael@0	136	for(cur++; cur <aLen; cur++)
michael@0	137	{
michael@0	138	c2 = this->GetClass(aText[cur]);
michael@0	139	if(c2 != c1)
michael@0	140	break;
michael@0	141	}
michael@0	142	if(kWbClassThaiLetter == c1)
michael@0	143	{
michael@0	144	// need to call Thai word breaker from here
michael@0	145	// we should pass the whole Thai segment to the thai word breaker to find a shorter answer
michael@0	146	}
michael@0	147	if (cur == aLen)
michael@0	148	return NS_WORDBREAKER_NEED_MORE_TEXT;
michael@0	149	return cur;
michael@0	150	}