will only handle the most basic filters for now, but it's a start; ne…

…eds tests

lib/filter.js

@@ -0,0 +1,30 @@
+/*jslint vars: true, white: true, plusplus: true, todo: true */
+"use strict";
+
+function subToRE(sub) {
+  var newSub = [
+    new RegExp(sub.find, sub.flag),
+    sub.repl
+  ];
+  //TODO: check repl to determine whether it requires
+  //TODO: a function instead of a simple substitution
+  return newSub;
+}
+
+function Filter(config) {
+  this.subs = config.subs.map(subToRE);
+}
+
+Filter.prototype = {
+
+  exec: function execFilter(text) {
+    this.subs.forEach(function(sub) {
+      text = text.replace(sub[0], sub[1]);
+    });
+    return text;
+  }
+
+};
+
+exports.Filter = Filter;
+