From 22eb706b42e7b5761b9f21aa99af83cc3b48e907 Mon Sep 17 00:00:00 2001
From: Fabian Jakobs <fabian.jakobs@web.de>
Date: Wed, 17 Aug 2011 10:25:06 +0200
Subject: [PATCH] IE fix for the tokenizer

---
 ace/lib/fixoldbrowsers.js |   2 +
 ace/lib/regexp.js         | 107 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 ace/lib/regexp.js

diff --git a/ace/lib/fixoldbrowsers.js b/ace/lib/fixoldbrowsers.js
index 36b89b18..e7006a8b 100644
--- a/ace/lib/fixoldbrowsers.js
+++ b/ace/lib/fixoldbrowsers.js
@@ -12,6 +12,8 @@
 
 define(function(require, exports, module) {
 
+require("ace/lib/regexp");
+
 /**
  * Brings an environment as close to ECMAScript 5 compliance
  * as is possible with the facilities of erstwhile engines.
diff --git a/ace/lib/regexp.js b/ace/lib/regexp.js
new file mode 100644
index 00000000..399dcf9b
--- /dev/null
+++ b/ace/lib/regexp.js
@@ -0,0 +1,107 @@
+define(function(require, exports, module) {
+
+// Based on code from:
+//
+// XRegExp 1.5.0
+// (c) 2007-2010 Steven Levithan
+// MIT License
+// <http://xregexp.com>
+// Provides an augmented, extensible, cross-browser implementation of regular expressions,
+// including support for additional syntax, flags, and methods
+
+    //---------------------------------
+    //  Private variables
+    //---------------------------------
+
+    var real = {
+            exec: RegExp.prototype.exec,
+            test: RegExp.prototype.test,
+            match: String.prototype.match,
+            replace: String.prototype.replace,
+            split: String.prototype.split
+        },
+        compliantExecNpcg = real.exec.call(/()??/, "")[1] === undefined, // check `exec` handling of nonparticipating capturing groups
+        compliantLastIndexIncrement = function () {
+            var x = /^/g;
+            real.test.call(x, "");
+            return !x.lastIndex;
+        }();
+
+    //---------------------------------
+    //  Overriden native methods
+    //---------------------------------
+
+    // Adds named capture support (with backreferences returned as `result.name`), and fixes two
+    // cross-browser issues per ES3:
+    // - Captured values for nonparticipating capturing groups should be returned as `undefined`,
+    //   rather than the empty string.
+    // - `lastIndex` should not be incremented after zero-length matches.
+    RegExp.prototype.exec = function (str) {
+        var match = real.exec.apply(this, arguments),
+            name, r2;
+        if (match) {
+            // Fix browsers whose `exec` methods don't consistently return `undefined` for
+            // nonparticipating capturing groups
+            if (!compliantExecNpcg && match.length > 1 && indexOf(match, "") > -1) {
+                r2 = RegExp(this.source, real.replace.call(getNativeFlags(this), "g", ""));
+                // Using `str.slice(match.index)` rather than `match[0]` in case lookahead allowed
+                // matching due to characters outside the match
+                real.replace.call(str.slice(match.index), r2, function () {
+                    for (var i = 1; i < arguments.length - 2; i++) {
+                        if (arguments[i] === undefined)
+                            match[i] = undefined;
+                    }
+                });
+            }
+            // Attach named capture properties
+            if (this._xregexp && this._xregexp.captureNames) {
+                for (var i = 1; i < match.length; i++) {
+                    name = this._xregexp.captureNames[i - 1];
+                    if (name)
+                       match[name] = match[i];
+                }
+            }
+            // Fix browsers that increment `lastIndex` after zero-length matches
+            if (!compliantLastIndexIncrement && this.global && !match[0].length && (this.lastIndex > match.index))
+                this.lastIndex--;
+        }
+        return match;
+    };
+
+    // Don't override `test` if it won't change anything
+    if (!compliantLastIndexIncrement) {
+        // Fix browser bug in native method
+        RegExp.prototype.test = function (str) {
+            // Use the native `exec` to skip some processing overhead, even though the overriden
+            // `exec` would take care of the `lastIndex` fix
+            var match = real.exec.call(this, str);
+            // Fix browsers that increment `lastIndex` after zero-length matches
+            if (match && this.global && !match[0].length && (this.lastIndex > match.index))
+                this.lastIndex--;
+            return !!match;
+        };
+    }
+
+    //---------------------------------
+    //  Private helper functions
+    //---------------------------------
+
+    function getNativeFlags (regex) {
+        return (regex.global     ? "g" : "") +
+               (regex.ignoreCase ? "i" : "") +
+               (regex.multiline  ? "m" : "") +
+               (regex.extended   ? "x" : "") + // Proposed for ES4; included in AS3
+               (regex.sticky     ? "y" : "");
+    };
+
+    function indexOf (array, item, from) {
+        if (Array.prototype.indexOf) // Use the native array method if available
+            return array.indexOf(item, from);
+        for (var i = from || 0; i < array.length; i++) {
+            if (array[i] === item)
+                return i;
+        }
+        return -1;
+    };
+
+});
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