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