| 'use strict'; |
| |
| var parsers = require('../parsers'); |
| |
| var valid_keywords = ['top', 'center', 'bottom', 'left', 'right']; |
| |
| var parse = function parse(v) { |
| if (v === '' || v === null) { |
| return undefined; |
| } |
| var parts = v.split(/\s+/); |
| if (parts.length > 2 || parts.length < 1) { |
| return undefined; |
| } |
| var types = []; |
| parts.forEach(function (part, index) { |
| types[index] = parsers.valueType(part); |
| }); |
| if (parts.length === 1) { |
| if (types[0] === parsers.TYPES.LENGTH || types[0] === parsers.TYPES.PERCENT) { |
| return v; |
| } |
| if (types[0] === parsers.TYPES.KEYWORD) { |
| if (valid_keywords.indexOf(v.toLowerCase()) !== -1 || v.toLowerCase() === 'inherit') { |
| return v; |
| } |
| } |
| return undefined; |
| } |
| if ((types[0] === parsers.TYPES.LENGTH || types[0] === parsers.TYPES.PERCENT) && |
| (types[1] === parsers.TYPES.LENGTH || types[1] === parsers.TYPES.PERCENT)) { |
| return v; |
| } |
| if (types[0] !== parsers.TYPES.KEYWORD || types[1] !== parsers.TYPES.KEYWORD) { |
| return undefined; |
| } |
| if (valid_keywords.indexOf(parts[0]) !== -1 && valid_keywords.indexOf(parts[1]) !== -1) { |
| return v; |
| } |
| return undefined; |
| }; |
| |
| module.exports.isValid = function isValid(v) { |
| return parse(v) !== undefined; |
| }; |
| |
| module.exports.definition = { |
| set: function (v) { |
| this._setProperty('background-position', parse(v)); |
| }, |
| get: function () { |
| return this.getPropertyValue('background-position'); |
| }, |
| enumerable: true, |
| configurable: true |
| }; |