cssparser.cpp

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/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2003 Lars Knoll ([e-mail])
 * Copyright (C) 2005 Allan Sandfeld Jensen ([e-mail])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

//#define CSS_DEBUG
//#define TOKEN_DEBUG
#define YYDEBUG 0

#include <kdebug.h>
#include <kglobal.h>
#include <kurl.h>

#include "cssparser.h"
#include "css_valueimpl.h"
#include "css_ruleimpl.h"
#include "css_stylesheetimpl.h"
#include "cssproperties.h"
#include "cssvalues.h"
#include "misc/helper.h"
#include "csshelper.h"
using namespace DOM;

#include <stdlib.h>
#include <assert.h>

// used to promote background: left to left center
#define BACKGROUND_SKIP_CENTER( num ) \
    if ( !pos_ok[ num ] && expected != 1 ) {    \
        pos_ok[num] = true; \
        pos[num] = 0; \
        skip_next = false; \
    }

ValueList::ValueList()
{
    values = (Value *) malloc( 16 * sizeof ( Value ) );
    numValues = 0;
    currentValue = 0;
    maxValues = 16;
}

ValueList::~ValueList()
{
    for ( int i = 0; i < numValues; i++ ) {
#ifdef CSS_DEBUG
        kdDebug( 6080 ) << "       value: (unit=" << values[i].unit <<")"<< endl;
#endif
        if ( values[i].unit == Value::Function ) {
            delete values[i].function->args;
            delete values[i].function;
        }
    }
    free( values );
}

void ValueList::addValue( const Value &val )
{
    if ( numValues >= maxValues ) {
        maxValues += 16;
        values = (Value *) realloc( values, maxValues*sizeof( Value ) );
    }
    values[numValues++] = val;
}


using namespace DOM;

#if YYDEBUG > 0
extern int cssyydebug;
#endif

extern int cssyyparse( void * parser );

CSSParser *CSSParser::currentParser = 0;

CSSParser::CSSParser( bool strictParsing )
{
#ifdef CSS_DEBUG
    kdDebug( 6080 ) << "CSSParser::CSSParser this=" << this << endl;
#endif
    strict = strictParsing;

    parsedProperties = (CSSProperty **) malloc( 32 * sizeof( CSSProperty * ) );
    numParsedProperties = 0;
    maxParsedProperties = 32;

    data = 0;
    valueList = 0;
    rule = 0;
    id = 0;
    important = false;
    nonCSSHint = false;
    inParseShortHand = false;

    defaultNamespace = anyNamespace;

    yy_start = 1;

#if YYDEBUG > 0
    cssyydebug = 1;
#endif

}

CSSParser::~CSSParser()
{
    if ( numParsedProperties )
        clearProperties();
    free( parsedProperties );

    delete valueList;

#ifdef CSS_DEBUG
    kdDebug( 6080 ) << "CSSParser::~CSSParser this=" << this << endl;
#endif

    free( data );

}

void CSSParser::runParser(int length)
{
    data[length-1] = 0;
    data[length-2] = 0;
    data[length-3] = ' ';

    yyTok = -1;
    block_nesting = 0;
    yy_hold_char = 0;
    yyleng = 0;
    yytext = yy_c_buf_p = data;
    yy_hold_char = *yy_c_buf_p;

    CSSParser *old = currentParser;
    currentParser = this;
    cssyyparse( this );
    currentParser = old;
}

void CSSParser::parseSheet( CSSStyleSheetImpl *sheet, const DOMString &string )
{
    styleElement = sheet;
    defaultNamespace = anyNamespace; // Reset the default namespace.

    int length = string.length() + 3;
    data = (unsigned short *)malloc( length *sizeof( unsigned short ) );
    memcpy( data, string.unicode(), string.length()*sizeof( unsigned short) );

#ifdef CSS_DEBUG
    kdDebug( 6080 ) << ">>>>>>> start parsing style sheet" << endl;
#endif
    runParser(length);
#ifdef CSS_DEBUG
    kdDebug( 6080 ) << "<<<<<<< done parsing style sheet" << endl;
#endif

    delete rule;
    rule = 0;
}

CSSRuleImpl *CSSParser::parseRule( DOM::CSSStyleSheetImpl *sheet, const DOM::DOMString &string )
{
    styleElement = sheet;

    const char khtml_rule[] = "@-khtml-rule{";
    int length = string.length() + 4 + strlen(khtml_rule);
    assert( !data );
    data = (unsigned short *)malloc( length *sizeof( unsigned short ) );
    for ( unsigned int i = 0; i < strlen(khtml_rule); i++ )
        data[i] = khtml_rule[i];
    memcpy( data + strlen( khtml_rule ), string.unicode(), string.length()*sizeof( unsigned short) );
    // qDebug("parse string = '%s'", QConstString( (const QChar *)data, length ).string().latin1() );
    data[length-4] = '}';

    runParser(length);

    CSSRuleImpl *result = rule;
    rule = 0;

    return result;
}

bool CSSParser::parseValue( DOM::CSSStyleDeclarationImpl *declaration, int _id, const DOM::DOMString &string,
                            bool _important, bool _nonCSSHint )
{
#ifdef CSS_DEBUG
    kdDebug( 6080 ) << "CSSParser::parseValue: id=" << _id << " important=" << _important
                    << " nonCSSHint=" << _nonCSSHint << " value='" << string.string() << "'" << endl;
#endif

    styleElement = declaration->stylesheet();

    const char khtml_value[] = "@-khtml-value{";
    int length = string.length() + 4 + strlen(khtml_value);
    assert( !data );
    data = (unsigned short *)malloc( length *sizeof( unsigned short ) );
    for ( unsigned int i = 0; i < strlen(khtml_value); i++ )
        data[i] = khtml_value[i];
    memcpy( data + strlen( khtml_value ), string.unicode(), string.length()*sizeof( unsigned short) );
    data[length-4] = '}';
    // qDebug("parse string = '%s'", QConstString( (const QChar *)data, length ).string().latin1() );

    id = _id;
    important = _important;
    nonCSSHint = _nonCSSHint;

    runParser(length);

    delete rule;
    rule = 0;

    bool ok = false;
    if ( numParsedProperties ) {
        ok = true;
        for ( int i = 0; i < numParsedProperties; i++ ) {
            declaration->removeProperty(parsedProperties[i]->m_id, nonCSSHint);
            declaration->values()->append( parsedProperties[i] );
        }
        numParsedProperties = 0;
    }

    return ok;
}

bool CSSParser::parseDeclaration( DOM::CSSStyleDeclarationImpl *declaration, const DOM::DOMString &string,
                                  bool _nonCSSHint )
{
#ifdef CSS_DEBUG
    kdDebug( 6080 ) << "CSSParser::parseDeclaration: nonCSSHint=" << nonCSSHint
                    << " value='" << string.string() << "'" << endl;
#endif

    styleElement = declaration->stylesheet();

    const char khtml_decls[] = "@-khtml-decls{";
    int length = string.length() + 4 + strlen(khtml_decls);
    assert( !data );
    data = (unsigned short *)malloc( length *sizeof( unsigned short ) );
    for ( unsigned int i = 0; i < strlen(khtml_decls); i++ )
        data[i] = khtml_decls[i];
    memcpy( data + strlen( khtml_decls ), string.unicode(), string.length()*sizeof( unsigned short) );
    data[length-4] = '}';

    nonCSSHint = _nonCSSHint;

    runParser(length);

    delete rule;
    rule = 0;

    bool ok = false;
    if ( numParsedProperties ) {
        ok = true;
        for ( int i = 0; i < numParsedProperties; i++ ) {
            declaration->removeProperty(parsedProperties[i]->m_id, false);
            declaration->values()->append( parsedProperties[i] );
        }
        numParsedProperties = 0;
    }

    return ok;
}

void CSSParser::addProperty( int propId, CSSValueImpl *value, bool important )
{
    CSSProperty *prop = new CSSProperty;
    prop->m_id = propId;
    prop->setValue( value );
    prop->m_bImportant = important;
    prop->nonCSSHint = nonCSSHint;

    if ( numParsedProperties >= maxParsedProperties ) {
        maxParsedProperties += 32;
        parsedProperties = (CSSProperty **) realloc( parsedProperties,
                                                    maxParsedProperties*sizeof( CSSProperty * ) );
    }
    parsedProperties[numParsedProperties++] = prop;
}

CSSStyleDeclarationImpl *CSSParser::createStyleDeclaration( CSSStyleRuleImpl *rule )
{
    QPtrList<CSSProperty> *propList = new QPtrList<CSSProperty>;
    propList->setAutoDelete( true );
    for ( int i = 0; i < numParsedProperties; i++ )
        propList->append( parsedProperties[i] );

    numParsedProperties = 0;
    return new CSSStyleDeclarationImpl(rule, propList);
}

void CSSParser::clearProperties()
{
    for ( int i = 0; i < numParsedProperties; i++ )
        delete parsedProperties[i];
    numParsedProperties = 0;
}

DOM::DocumentImpl *CSSParser::document() const
{
    const StyleBaseImpl* root = styleElement;
    DocumentImpl *doc = 0;
    while (root->parent())
        root = root->parent();
    if (root->isCSSStyleSheet())
        doc = static_cast<const CSSStyleSheetImpl*>(root)->doc();
    return doc;
}


// defines units allowed for a certain property, used in parseUnit
enum Units
{
    FUnknown   = 0x0000,
    FInteger   = 0x0001,
    FNumber    = 0x0002,  // Real Numbers
    FPercent   = 0x0004,
    FLength    = 0x0008,
    FAngle     = 0x0010,
    FTime      = 0x0020,
    FFrequency = 0x0040,
    FRelative  = 0x0100,
    FNonNeg    = 0x0200
};

static bool validUnit( Value *value, int unitflags, bool strict )
{
    if ( unitflags & FNonNeg && value->fValue < 0 )
        return false;

    bool b = false;
    switch( value->unit ) {
    case CSSPrimitiveValue::CSS_NUMBER: