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/**
* cssfilter
*
* @author 老雷<leizongmin@gmail.com>
*/
var DEFAULT = require('./default');
var parseStyle = require('./parser');
var _ = require('./util');
/**
* 返回值是否为空
*
* @param {Object} obj
* @return {Boolean}
*/
function isNull (obj) {
return (obj === undefined || obj === null);
}
/**
* 浅拷贝对象
*
* @param {Object} obj
* @return {Object}
*/
function shallowCopyObject (obj) {
var ret = {};
for (var i in obj) {
ret[i] = obj[i];
}
return ret;
}
/**
* 创建CSS过滤器
*
* @param {Object} options
* - {Object} whiteList
* - {Function} onAttr
* - {Function} onIgnoreAttr
* - {Function} safeAttrValue
*/
function FilterCSS (options) {
options = shallowCopyObject(options || {});
options.whiteList = options.whiteList || DEFAULT.whiteList;
options.onAttr = options.onAttr || DEFAULT.onAttr;
options.onIgnoreAttr = options.onIgnoreAttr || DEFAULT.onIgnoreAttr;
options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
this.options = options;
}
FilterCSS.prototype.process = function (css) {
// 兼容各种奇葩输入
css = css || '';
css = css.toString();
if (!css) return '';
var me = this;
var options = me.options;
var whiteList = options.whiteList;
var onAttr = options.onAttr;
var onIgnoreAttr = options.onIgnoreAttr;
var safeAttrValue = options.safeAttrValue;
var retCSS = parseStyle(css, function (sourcePosition, position, name, value, source) {
var check = whiteList[name];
var isWhite = false;
if (check === true) isWhite = check;
else if (typeof check === 'function') isWhite = check(value);
else if (check instanceof RegExp) isWhite = check.test(value);
if (isWhite !== true) isWhite = false;
// 如果过滤后 value 为空则直接忽略
value = safeAttrValue(name, value);
if (!value) return;
var opts = {
position: position,
sourcePosition: sourcePosition,
source: source,
isWhite: isWhite
};
if (isWhite) {
var ret = onAttr(name, value, opts);
if (isNull(ret)) {
return name + ':' + value;
} else {
return ret;
}
} else {
var ret = onIgnoreAttr(name, value, opts);
if (!isNull(ret)) {
return ret;
}
}
});
return retCSS;
};
module.exports = FilterCSS;
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