var TYPE = require('../../tokenizer').TYPE;
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var IDENT = TYPE.Ident;
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var NUMBER = TYPE.Number;
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var DIMENSION = TYPE.Dimension;
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var LEFTPARENTHESIS = TYPE.LeftParenthesis;
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var RIGHTPARENTHESIS = TYPE.RightParenthesis;
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var COLON = TYPE.Colon;
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var DELIM = TYPE.Delim;
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module.exports = {
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name: 'MediaFeature',
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structure: {
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name: String,
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value: ['Identifier', 'Number', 'Dimension', 'Ratio', null]
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},
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parse: function() {
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var start = this.scanner.tokenStart;
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var name;
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var value = null;
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this.eat(LEFTPARENTHESIS);
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this.scanner.skipSC();
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name = this.consume(IDENT);
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this.scanner.skipSC();
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if (this.scanner.tokenType !== RIGHTPARENTHESIS) {
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this.eat(COLON);
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this.scanner.skipSC();
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switch (this.scanner.tokenType) {
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case NUMBER:
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if (this.lookupNonWSType(1) === DELIM) {
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value = this.Ratio();
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} else {
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value = this.Number();
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}
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break;
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case DIMENSION:
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value = this.Dimension();
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break;
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case IDENT:
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value = this.Identifier();
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break;
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default:
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this.error('Number, dimension, ratio or identifier is expected');
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}
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this.scanner.skipSC();
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}
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this.eat(RIGHTPARENTHESIS);
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return {
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type: 'MediaFeature',
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loc: this.getLocation(start, this.scanner.tokenStart),
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name: name,
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value: value
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};
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},
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generate: function(node) {
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this.chunk('(');
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this.chunk(node.name);
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if (node.value !== null) {
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this.chunk(':');
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this.node(node.value);
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}
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this.chunk(')');
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}
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};
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