From f87697e22f289cc96fc4e79da81575115b3e89a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <sijanecantonluka@gmail.com>
Date: Sat, 8 Feb 2020 16:41:06 +0100
Subject: added messaging

---
 node_modules/cssfilter/lib/css.js | 110 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 node_modules/cssfilter/lib/css.js

(limited to 'node_modules/cssfilter/lib/css.js')

diff --git a/node_modules/cssfilter/lib/css.js b/node_modules/cssfilter/lib/css.js
new file mode 100644
index 0000000..49e9707
--- /dev/null
+++ b/node_modules/cssfilter/lib/css.js
@@ -0,0 +1,110 @@
+/**
+ * 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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