From 6bbd88088b831472a27ac90d9cff79e8dd798f30 Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Fri, 19 Mar 2010 10:38:46 +0100
Subject: [PATCH] Implemented and used PEG.ArrayUtils.each.

---
 lib/metagrammar.js    |  2 +-
 lib/metagrammar.pegjs |  2 +-
 lib/runtime.js        |  7 +++++++
 test/runtime-test.js  | 13 +++++++++++++
 4 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/lib/metagrammar.js b/lib/metagrammar.js
index 7f8b6c5..490620b 100644
--- a/lib/metagrammar.js
+++ b/lib/metagrammar.js
@@ -54,7 +54,7 @@ PEG.grammarParser = (function(){
     var result0 = result1 !== null
       ? (function() { 
         var result = {};
-        for (var i = 0; i < (arguments[1]).length; i++) { result[(arguments[1])[i].getName()] = (arguments[1])[i]; }
+        PEG.ArrayUtils.each((arguments[1]), function(rule) { result[rule.getName()] = rule; });
         return result;
        }).apply(this, result1)
       : null;
diff --git a/lib/metagrammar.pegjs b/lib/metagrammar.pegjs
index 47d4229..033f596 100644
--- a/lib/metagrammar.pegjs
+++ b/lib/metagrammar.pegjs
@@ -1,6 +1,6 @@
 grammar: __ rule+ {
   var result = {};
-  for (var i = 0; i < $2.length; i++) { result[$2[i].getName()] = $2[i]; }
+  PEG.ArrayUtils.each($2, function(rule) { result[rule.getName()] = rule; });
   return result;
 }
 
diff --git a/lib/runtime.js b/lib/runtime.js
index 058b766..61c889d 100644
--- a/lib/runtime.js
+++ b/lib/runtime.js
@@ -13,6 +13,13 @@ PEG = {};
 /* Array manipulation utility functions. */
 
 PEG.ArrayUtils = {
+  each: function(array, callback) {
+    var length = array.length;
+    for (var i = 0; i < length; i++) {
+      callback(array[i]);
+    }
+  },
+
   map: function(array, callback) {
     var result = [];
     var length = array.length;
diff --git a/test/runtime-test.js b/test/runtime-test.js
index 263f1d3..9a7a469 100644
--- a/test/runtime-test.js
+++ b/test/runtime-test.js
@@ -4,6 +4,19 @@
 
 module("PEG.ArrayUtils");
 
+test("each", function() {
+  var sum;
+  function increment(x) { sum += x; }
+
+  sum = 0;
+  PEG.ArrayUtils.each([], increment);
+  strictEqual(sum, 0);
+
+  sum = 0;
+  PEG.ArrayUtils.each([1, 2, 3], increment);
+  strictEqual(sum, 6);
+});
+
 test("map", function() {
   function square(x) { return x * x; }