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/**
* Handles parsing, caching, and detecting changes to border-image CSS
* @constructor
* @param {Element} el the target element
*/
PIE.BorderImageStyleInfo = PIE.StyleInfoBase.newStyleInfo( {
cssProperty: 'border-image',
styleProperty: 'borderImage',
repeatIdents: { 'stretch':1, 'round':1, 'repeat':1, 'space':1 },
parseCss: function( css ) {
var p = null, tokenizer, token, type, value,
slices, widths, outsets,
slashCount = 0,
Type = PIE.Tokenizer.Type,
IDENT = Type.IDENT,
NUMBER = Type.NUMBER,
PERCENT = Type.PERCENT;
if( css ) {
tokenizer = new PIE.Tokenizer( css );
p = {};
function isSlash( token ) {
return token && ( token.tokenType & Type.OPERATOR ) && ( token.tokenValue === '/' );
}
function isFillIdent( token ) {
return token && ( token.tokenType & IDENT ) && ( token.tokenValue === 'fill' );
}
function collectSlicesEtc() {
slices = tokenizer.until( function( tok ) {
return !( tok.tokenType & ( NUMBER | PERCENT ) );
} );
if( isFillIdent( tokenizer.next() ) && !p.fill ) {
p.fill = true;
} else {
tokenizer.prev();
}
if( isSlash( tokenizer.next() ) ) {
slashCount++;
widths = tokenizer.until( function( token ) {
return !token.isLengthOrPercent() && !( ( token.tokenType & IDENT ) && token.tokenValue === 'auto' );
} );
if( isSlash( tokenizer.next() ) ) {
slashCount++;
outsets = tokenizer.until( function( token ) {
return !token.isLength();
} );
}
} else {
tokenizer.prev();
}
}
while( token = tokenizer.next() ) {
type = token.tokenType;
value = token.tokenValue;
// Numbers and/or 'fill' keyword: slice values. May be followed optionally by width values, followed optionally by outset values
if( type & ( NUMBER | PERCENT ) && !slices ) {
tokenizer.prev();
collectSlicesEtc();
}
else if( isFillIdent( token ) && !p.fill ) {
p.fill = true;
collectSlicesEtc();
}
// Idents: one or values for 'repeat'
else if( ( type & IDENT ) && this.repeatIdents[value] && !p.repeat ) {
p.repeat = { h: value };
if( token = tokenizer.next() ) {
if( ( token.tokenType & IDENT ) && this.repeatIdents[token.tokenValue] ) {
p.repeat.v = token.tokenValue;
} else {
tokenizer.prev();
}
}
}
// URL of the image
else if( ( type & Type.URL ) && !p.src ) {
p.src = value;
}
// Found something unrecognized; exit.
else {
return null;
}
}
// Validate what we collected
if( !p.src || !slices || slices.length < 1 || slices.length > 4 ||
( widths && widths.length > 4 ) || ( slashCount === 1 && widths.length < 1 ) ||
( outsets && outsets.length > 4 ) || ( slashCount === 2 && outsets.length < 1 ) ) {
return null;
}
// Fill in missing values
if( !p.repeat ) {
p.repeat = { h: 'stretch' };
}
if( !p.repeat.v ) {
p.repeat.v = p.repeat.h;
}
function distributeSides( tokens, convertFn ) {
return {
't': convertFn( tokens[0] ),
'r': convertFn( tokens[1] || tokens[0] ),
'b': convertFn( tokens[2] || tokens[0] ),
'l': convertFn( tokens[3] || tokens[1] || tokens[0] )
};
}
p.slice = distributeSides( slices, function( tok ) {
return PIE.getLength( ( tok.tokenType & NUMBER ) ? tok.tokenValue + 'px' : tok.tokenValue );
} );
if( widths && widths[0] ) {
p.widths = distributeSides( widths, function( tok ) {
return tok.isLengthOrPercent() ? PIE.getLength( tok.tokenValue ) : tok.tokenValue;
} );
}
if( outsets && outsets[0] ) {
p.outset = distributeSides( outsets, function( tok ) {
return tok.isLength() ? PIE.getLength( tok.tokenValue ) : tok.tokenValue;
} );
}
}
return p;
}
} );
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