mirror of https://github.com/jkjoy/sunpeiwen.git
59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
'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,
|
|
};
|