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