break_lines.cpp

将konqueror浏览器移植到ARM9 2410中

#include <break_lines.h>
#include <qtextcodec.h>
#include <qcstring.h>

#ifdef HAVE_THAI_BREAKS
#include "ThBreakIterator.h"

static const QChar *cached = 0;
static QCString *cachedString = 0;
static ThBreakIterator *thaiIt = 0;
#endif

void cleanupLineBreaker()
{
#ifdef HAVE_THAI_BREAKS
    if ( cachedString )
	delete cachedString;
    if ( thaiIt )
	delete thaiIt;
    cached = 0;
#endif
}

namespace khtml {
/*
  This function returns true, if the string can bre broken before the 
  character at position pos in the string s with length len
*/
#ifdef HAVE_THAI_BREAKS
bool isBreakable( const QChar *s, int pos, int len )
#else
bool isBreakable( const QChar *s, int pos, int )
#endif    
{
    const QChar *c = s+pos;
    char ch = c->latin1();
    if ( !ch ) {
	// not latin1, need to do more sophisticated checks for asian fonts
	unsigned char row = c->row();
	if ( row == 0x0e ) {
	    // 0e00 - 0e7f == Thai
	    if ( c->cell() < 0x80 ) {
#ifdef HAVE_THAI_BREAKS
		// check for thai
		if( s != cached ) {
		    // build up string of thai chars
		    QTextCodec *thaiCodec = QTextCodec::codecForMib(2259);
		    if ( !cachedString )
			cachedString = new QCString;
		    if ( !thaiIt )
			thaiIt = ThBreakIterator::createWordInstance(); 
		    *cachedString = thaiCodec->fromUnicode( QConstString( (QChar *)s, len ).string() );
		}
		thaiIt->setText((tchar *)cachedString->data());
		for(int i = thaiIt->first(); i != thaiIt->DONE; i = thaiIt->next() ) {
		    if( i == pos )
			return true;
		    if( i > pos )
			return false;
		}
		return false;
#else
		// if we don't have a thai line breaking lib, allow
		// breaks everywhere except directly before punctuation.
		return true;
#endif
	    } else 
		return false;
	}
	if ( row < 0x11 ) // no asian font
	    return false;
	if ( row > 0x2d && row < 0xfb || row == 0x11 )
	    // asian line breaking. Everywhere allowed except directly
	    // in front of a punctuation character.
	    return true;
    } else {
	if ( ch == ' ' || ch == '\n' )
	    return true;
    }
    return false;
}

};