1 files changed, 30 insertions, 0 deletions
diff --git a/js/lib/common.js b/js/lib/common.js
new file mode 100644
index 0000000..e7cc13b
--- /dev/null
+++ b/js/lib/common.js
@@ -0,0 +1,30 @@
+var entityToChar = require('./html5-entities.js').entityToChar;
+
+var ENTITY = "&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});";
+
+var reBackslashOrAmp = /[\\&]/;
+
+var ESCAPABLE = '[!"#$%&\'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]';
+
+var reEntityOrEscapedChar = new RegExp('\\\\' + ESCAPABLE + '|' + ENTITY, 'gi');
+
+var unescapeChar = function(s) {
+    "use strict";
+    if (s[0] === '\\') {
+        return s[1];
+    } else {
+        return entityToChar(s);
+    }
+};
+
+// Replace entities and backslash escapes with literal characters.
+var unescapeString = function(s) {
+    "use strict";
+    if (reBackslashOrAmp.test(s)) {
+        return s.replace(reEntityOrEscapedChar, unescapeChar);
+    } else {
+        return s;
+    }
+};
+
+module.exports = { unescapeString: unescapeString };