html_elementimpl.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

static inline bool isHexDigit( const QChar &c ) {
    return ( c >= '0' && c <= '9' ) ||
	   ( c >= 'a' && c <= 'f' ) ||
	   ( c >= 'A' && c <= 'F' );
}

static inline int toHex( const QChar &c ) {
    return ( (c >= '0' && c <= '9')
	     ? (c.unicode() - '0')
	     : ( ( c >= 'a' && c <= 'f' )
		 ? (c.unicode() - 'a' + 10)
		 : ( ( c >= 'A' && c <= 'F' )
		     ? (c.unicode() - 'A' + 10)
		     : -1 ) ) );
}

/* color parsing that tries to match as close as possible IE 6. */
void HTMLElementImpl::addHTMLColor( int id, const DOMString &c )
{
    if(!m_styleDecls) createDecl();

    // this is the only case no color gets applied in IE.
    if ( !c.length() ) {
	removeCSSProperty(id);
	return;
    }

    if ( m_styleDecls->setProperty(id, c, false, true) )
	return;

    QString color = c.string();
    // not something that fits the specs.

    // we're emulating IEs color parser here. It maps transparent to black, otherwise it tries to build a rgb value
    // out of everyhting you put in. The algorithm is experimentally determined, but seems to work for all test cases I have.

    // the length of the color value is rounded up to the next
    // multiple of 3. each part of the rgb triple then gets one third
    // of the length.
    //
    // Each triplet is parsed byte by byte, mapping
    // each number to a hex value (0-9a-fA-F to their values
    // everything else to 0).
    //
    // The highest non zero digit in all triplets is remembered, and
    // used as a normalization point to normalize to values between 0
    // and 255.

    if ( color.lower() != "transparent" ) {
	if ( color[0] == '#' )
	    color.remove( 0,  1 );
	int basicLength = (color.length() + 2) / 3;
	if ( basicLength > 1 ) {
	    // IE ignores colors with three digits or less
// 	    qDebug("trying to fix up color '%s'. basicLength=%d, length=%d",
// 		   color.latin1(), basicLength, color.length() );
	    int colors[3] = { 0, 0, 0 };
	    int component = 0;
	    int pos = 0;
	    int maxDigit = basicLength-1;
	    while ( component < 3 ) {
		// search forward for digits in the string
		int numDigits = 0;
		while ( pos < (int)color.length() && numDigits < basicLength ) {
		    int hex = toHex( color[pos] );
		    colors[component] = (colors[component] << 4);
		    if ( hex > 0 ) {
			colors[component] += hex;
			maxDigit = kMin( maxDigit, numDigits );
		    }
		    numDigits++;
		    pos++;
		}
		while ( numDigits++ < basicLength )
		    colors[component] <<= 4;
		component++;
	    }
	    maxDigit = basicLength - maxDigit;
// 	    qDebug("color is %x %x %x, maxDigit=%d",  colors[0], colors[1], colors[2], maxDigit );

	    // normalize to 00-ff. The highest filled digit counts, minimum is 2 digits
	    maxDigit -= 2;
	    colors[0] >>= 4*maxDigit;
	    colors[1] >>= 4*maxDigit;
	    colors[2] >>= 4*maxDigit;
// 	    qDebug("normalized color is %x %x %x",  colors[0], colors[1], colors[2] );
	    // 	assert( colors[0] < 0x100 && colors[1] < 0x100 && colors[2] < 0x100 );

	    color.sprintf("#%02x%02x%02x", colors[0], colors[1], colors[2] );
// 	    qDebug( "trying to add fixed color string '%s'", color.latin1() );
	    if ( m_styleDecls->setProperty(id, DOMString(color), false, true) )
		return;
	}
    }
    m_styleDecls->setProperty(id, CSS_VAL_BLACK, false, true);
}

void HTMLElementImpl::removeCSSProperty(int id)
{
    if(!m_styleDecls)
        return;
    m_styleDecls->setParent(getDocument()->elementSheet());
    m_styleDecls->removeProperty(id, true /*nonCSSHint */);
    setChanged();
}

DOMString HTMLElementImpl::innerHTML() const
{
    DOMString result = "";
    for (NodeImpl *child = firstChild(); child != NULL; child = child->nextSibling())
        result += child->toString();
    return result;
}

DOMString HTMLElementImpl::innerText() const
{
    DOMString text = "";
    if(!firstChild())
        return text;

    const NodeImpl *n = this;
    // find the next text/image after the anchor, to get a position
    while(n) {
        if(n->firstChild())
            n = n->firstChild();
        else if(n->nextSibling())
            n = n->nextSibling();
        else {
            NodeImpl *next = 0;
            while(!next) {
                n = n->parentNode();
                if(!n || n == (NodeImpl *)this ) goto end;
                next = n->nextSibling();
            }
            n = next;
        }
        if(n->isTextNode() ) {
            text += static_cast<const TextImpl *>(n)->data();
        }
    }
 end:
    return text;
}

DocumentFragment HTMLElementImpl::createContextualFragment( const DOMString &html )
{
    // the following is in accordance with the definition as used by IE
    if( endTag[id()] == FORBIDDEN )
        return DocumentFragment();
    // IE disallows innerHTML on inline elements.
    // I don't see why we should have this restriction, as our
    // dhtml engine can cope with it. Lars
    //if ( isInline() ) return false;
    switch( id() ) {
        case ID_COL:
        case ID_COLGROUP:
        case ID_FRAMESET:
        case ID_HEAD:
        case ID_STYLE:
        case ID_TABLE:
        case ID_TBODY:
        case ID_TFOOT:
        case ID_THEAD:
        case ID_TITLE:
            return DocumentFragment();
        default:
            break;
    }
    if ( !getDocument()->isHTMLDocument() )
        return DocumentFragment();

    DocumentFragmentImpl* fragment = new DocumentFragmentImpl( docPtr() );
    DocumentFragment f( fragment );
    {
        HTMLTokenizer tok( docPtr(), fragment );
        tok.begin();
        tok.write( html.string(), true );
        tok.end();
    }

    // Exceptions are ignored because none ought to happen here.
    int ignoredExceptionCode;

    // we need to pop <html> and <body> elements and remove <head> to
    // accomadate folks passing complete HTML documents to make the
    // child of an element.
    Node n;

    for ( NodeImpl* node = fragment->firstChild(); node; ) {
        if (node->id() == ID_HTML || node->id() == ID_BODY) {
            NodeImpl* firstChild = node->firstChild();
            NodeImpl* child = firstChild;
            while ( child ) {
                NodeImpl *nextChild = child->nextSibling();
                n = fragment->insertBefore(child, node, ignoredExceptionCode);
                child = nextChild;
            }
            if ( !firstChild ) {
                NodeImpl *nextNode = node->nextSibling();
                n = fragment->removeChild(node, ignoredExceptionCode);
                node = nextNode;
            } else {
                n = fragment->removeChild(node, ignoredExceptionCode);
                node = firstChild;
            }
        } else if (node->id() == ID_HEAD) {
            NodeImpl *nextNode = node->nextSibling();
            n = fragment->removeChild(node, ignoredExceptionCode);
            node = nextNode;
        } else {
            node = node->nextSibling();
        }
    }

    return f;
}

void HTMLElementImpl::setInnerHTML( const DOMString &html, int &exceptioncode )
{
    DocumentFragment fragment = createContextualFragment( html );
    if ( fragment.isNull() ) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }

    // Make sure adding the new child is ok, before removing all children (#96187)
    checkAddChild( fragment.handle(), exceptioncode );
    if ( exceptioncode )
        return;

    removeChildren();
    appendChild( fragment.handle(), exceptioncode );
}

void HTMLElementImpl::setInnerText( const DOMString &text, int& exceptioncode )
{
    // following the IE specs.
    if( endTag[id()] == FORBIDDEN ) {
        exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
        return;
    }
    // IE disallows innerHTML on inline elements. I don't see why we should have this restriction, as our
    // dhtml engine can cope with it. Lars
    //if ( isInline() ) return false;
    switch( id() ) {
        case ID_COL:
        case ID_COLGROUP:
        case ID_FRAMESET:
        case ID_HEAD:
        case ID_HTML:
        case ID_TABLE:
        case ID_TBODY:
        case ID_TFOOT:
        case ID_THEAD:
        case ID_TR:
            exceptioncode = DOMException::NO_MODIFICATION_ALLOWED_ERR;
            return;
        default:
            break;
    }

    removeChildren();

    TextImpl *t = new TextImpl( docPtr(), text.implementation() );
    appendChild( t, exceptioncode );
}

void HTMLElementImpl::addHTMLAlignment( DOMString alignment )
{
    //qDebug("alignment is %s", alignment.string().latin1() );
    // vertical alignment with respect to the current baseline of the text
    // right or left means floating images
    int propfloat = -1;
    int propvalign = -1;
    if ( strcasecmp( alignment, "absmiddle" ) == 0 ) {
        propvalign = CSS_VAL_MIDDLE;
    } else if ( strcasecmp( alignment, "absbottom" ) == 0 ) {
        propvalign = CSS_VAL_BOTTOM;
    } else if ( strcasecmp( alignment, "left" ) == 0 ) {
	propfloat = CSS_VAL_LEFT;
	propvalign = CSS_VAL_TOP;
    } else if ( strcasecmp( alignment, "right" ) == 0 ) {
	propfloat = CSS_VAL_RIGHT;
	propvalign = CSS_VAL_TOP;
    } else if ( strcasecmp( alignment, "top" ) == 0 ) {
	propvalign = CSS_VAL_TOP;
    } else if ( strcasecmp( alignment, "middle" ) == 0 ) {
	propvalign = CSS_VAL__KHTML_BASELINE_MIDDLE;
    } else if ( strcasecmp( alignment, "center" ) == 0 ) {
	propvalign = CSS_VAL_MIDDLE;
    } else if ( strcasecmp( alignment, "bottom" ) == 0 ) {
	propvalign = CSS_VAL_BASELINE;
    } else if ( strcasecmp ( alignment, "texttop") == 0 ) {
	propvalign = CSS_VAL_TEXT_TOP;
    }

    if ( propfloat != -1 )
	addCSSProperty( CSS_PROP_FLOAT, propfloat );
    if ( propvalign != -1 )
	addCSSProperty( CSS_PROP_VERTICAL_ALIGN, propvalign );
}

DOMString HTMLElementImpl::toString() const
{
    if (!hasChildNodes()) {
	DOMString result = openTagStartToString();
	result += ">";

	if (endTag[id()] == REQUIRED) {
	    result += "</";
	    result += tagName();
	    result += ">";
	}

	return result;
    }

    return ElementImpl::toString();
}

// -------------------------------------------------------------------------
HTMLGenericElementImpl::HTMLGenericElementImpl(DocumentPtr *doc, ushort i)
    : HTMLElementImpl(doc)
{
    _id = i;
}

HTMLGenericElementImpl::~HTMLGenericElementImpl()
{
}