From d3aff0c66a7d08184ca723a1e10ddc59c7e9f9b3 Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Fri, 9 Sep 2011 19:45:22 +0200
Subject: [PATCH] Use |charAt| instead of |substr| when matching classes

Speed impact
------------
Before:     131.36 kB/s
After:      213.59 kB/s
Difference: 62.59%

Size impact
-----------
Before:     1056976 b
After:      1056976 b
Difference: 0.00%

(Measured by /tools/impact with Node.js v0.4.8 on x86_64 GNU/Linux.)

Closes GH-49.
---
 src/emitter.js |  2 +-
 src/parser.js  | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/emitter.js b/src/emitter.js
index adc5d51..8ce1d89 100644
--- a/src/emitter.js
+++ b/src/emitter.js
@@ -753,7 +753,7 @@ PEG.compiler.emitter = function(ast) {
       }
 
       return formatCode(
-        "if (${regexp}.test(input.substr(pos))) {",
+        "if (${regexp}.test(input.charAt(pos))) {",
         "  ${resultVar} = input.charAt(pos);",
         "  pos++;",
         "} else {",
diff --git a/src/parser.js b/src/parser.js
index e16e0dd..7151295 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -1123,7 +1123,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[^{}]/.test(input.substr(pos))) {
+        if (/^[^{}]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3023,7 +3023,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[0-9]/.test(input.substr(pos))) {
+        if (/^[0-9]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3054,7 +3054,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[0-9a-fA-F]/.test(input.substr(pos))) {
+        if (/^[0-9a-fA-F]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3112,7 +3112,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[a-z]/.test(input.substr(pos))) {
+        if (/^[a-z]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3143,7 +3143,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[A-Z]/.test(input.substr(pos))) {
+        if (/^[A-Z]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3571,7 +3571,7 @@ PEG.parser = (function(){
         var pos0;
         
         
-        if (/^[\n\r\u2028\u2029]/.test(input.substr(pos))) {
+        if (/^[\n\r\u2028\u2029]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {
@@ -3602,7 +3602,7 @@ PEG.parser = (function(){
         var pos0;
         
         reportFailures++;
-        if (/^[ 	\xA0\uFEFF\u1680\u180E\u2000-\u200A\u202F\u205F\u3000]/.test(input.substr(pos))) {
+        if (/^[ 	\xA0\uFEFF\u1680\u180E\u2000-\u200A\u202F\u205F\u3000]/.test(input.charAt(pos))) {
           result0 = input.charAt(pos);
           pos++;
         } else {