From 18811ef276b6147c9a73d361e5b00bb9855827fa Mon Sep 17 00:00:00 2001
From: "Elf M. Sternberg" <elf.sternberg@gmail.com>
Date: Fri, 4 May 2012 13:36:33 -0700
Subject: [PATCH] Adding 'putback', ' special case where the end of a match
 parameter, outside a specified regexp, shouldn't be consumed.

---
 lib/reparse.js     | 13 ++++++++-----
 src/reparse.coffee |  6 +++---
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/lib/reparse.js b/lib/reparse.js
index 55e8f27..1d9a2d7 100644
--- a/lib/reparse.js
+++ b/lib/reparse.js
@@ -101,17 +101,20 @@
       throw new Error("Could not parse '" + this.input + "'.");
     };
 
-    ReParse.prototype.match = function(pattern) {
+    ReParse.prototype.match = function(pattern, putback) {
       var probe;
+      if (putback == null) {
+        putback = false;
+      }
       probe = this.input.match(pattern);
       if (!probe) {
         return this.fail();
       }
-      this.input = this.input.substr(probe[0].length);
-      if (probe[1] === undefined) {
-        return probe[0];
-      } else {
+      this.input = this.input.substr(((probe[1] != null) && putback ? probe[1].length : probe[0].length));
+      if (probe[1] != null) {
         return probe[1];
+      } else {
+        return probe[0];
       }
     };
 
diff --git a/src/reparse.coffee b/src/reparse.coffee
index 2ac84ae..59c524e 100644
--- a/src/reparse.coffee
+++ b/src/reparse.coffee
@@ -75,11 +75,11 @@ exports.ReParse = class ReParse
     #
     # Note that the `return fail()` call eventually leads to a throw.
 
-    match: (pattern) =>
+    match: (pattern, putback = false) =>
         probe = @input.match pattern
         return @fail()  unless probe
-        @input = @input.substr probe[0].length
-        if probe[1] is `undefined` then probe[0] else probe[1]
+        @input = @input.substr (if probe[1]? and putback then probe[1].length else probe[0].length)
+        if probe[1]? then probe[1] else probe[0]
 
     # Attempts to apply the method and produce a value.  If it fails,
     # restores the input to the previous state.