From 75a4f0d9317709e00f5c84b6b9d8cc4241f26d84 Mon Sep 17 00:00:00 2001
From: kpdecker <kpdecker@gmail.com>
Date: Fri, 15 Feb 2013 20:22:11 -0600
Subject: [PATCH] Negative number literal support

Fixes #422
---
 dist/handlebars.js     |  2 +-
 spec/qunit_spec.js     | 10 ++++++++++
 spec/tokenizer_spec.rb |  4 ++++
 src/handlebars.l       |  2 +-
 4 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/dist/handlebars.js b/dist/handlebars.js
index 26d920778..8f3433af7 100644
--- a/dist/handlebars.js
+++ b/dist/handlebars.js
@@ -635,7 +635,7 @@ case 32: return 5;
 break;
 }
 };
-lexer.rules = [/^(?:[^\x00]*?(?=(\{\{)))/,/^(?:[^\x00]+)/,/^(?:[^\x00]{2,}?(?=(\{\{|$)))/,/^(?:[\s\S]*?--\}\})/,/^(?:\{\{>)/,/^(?:\{\{#)/,/^(?:\{\{\/)/,/^(?:\{\{\^)/,/^(?:\{\{\s*else\b)/,/^(?:\{\{\{)/,/^(?:\{\{&)/,/^(?:\{\{!--)/,/^(?:\{\{![\s\S]*?\}\})/,/^(?:\{\{)/,/^(?:=)/,/^(?:\.(?=[} ]))/,/^(?:\.\.)/,/^(?:[\/.])/,/^(?:\s+)/,/^(?:\}\}\})/,/^(?:\}\})/,/^(?:"(\\["]|[^"])*")/,/^(?:'(\\[']|[^'])*')/,/^(?:@[a-zA-Z]+)/,/^(?:true(?=[}\s]))/,/^(?:false(?=[}\s]))/,/^(?:[0-9]+(?=[}\s]))/,/^(?:[a-zA-Z0-9_$-]+(?=[=}\s\/.]))/,/^(?:\[[^\]]*\])/,/^(?:.)/,/^(?:\s+)/,/^(?:[a-zA-Z0-9_$-/]+)/,/^(?:$)/];
+lexer.rules = [/^(?:[^\x00]*?(?=(\{\{)))/,/^(?:[^\x00]+)/,/^(?:[^\x00]{2,}?(?=(\{\{|$)))/,/^(?:[\s\S]*?--\}\})/,/^(?:\{\{>)/,/^(?:\{\{#)/,/^(?:\{\{\/)/,/^(?:\{\{\^)/,/^(?:\{\{\s*else\b)/,/^(?:\{\{\{)/,/^(?:\{\{&)/,/^(?:\{\{!--)/,/^(?:\{\{![\s\S]*?\}\})/,/^(?:\{\{)/,/^(?:=)/,/^(?:\.(?=[} ]))/,/^(?:\.\.)/,/^(?:[\/.])/,/^(?:\s+)/,/^(?:\}\}\})/,/^(?:\}\})/,/^(?:"(\\["]|[^"])*")/,/^(?:'(\\[']|[^'])*')/,/^(?:@[a-zA-Z]+)/,/^(?:true(?=[}\s]))/,/^(?:false(?=[}\s]))/,/^(?:-?[0-9]+(?=[}\s]))/,/^(?:[a-zA-Z0-9_$-]+(?=[=}\s\/.]))/,/^(?:\[[^\]]*\])/,/^(?:.)/,/^(?:\s+)/,/^(?:[a-zA-Z0-9_$-/]+)/,/^(?:$)/];
 lexer.conditions = {"mu":{"rules":[4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,32],"inclusive":false},"emu":{"rules":[2],"inclusive":false},"com":{"rules":[3],"inclusive":false},"par":{"rules":[30,31],"inclusive":false},"INITIAL":{"rules":[0,1,32],"inclusive":true}};
 return lexer;})()
 parser.lexer = lexer;
diff --git a/spec/qunit_spec.js b/spec/qunit_spec.js
index fa15c3c05..5953bcacf 100644
--- a/spec/qunit_spec.js
+++ b/spec/qunit_spec.js
@@ -571,6 +571,16 @@ test("simple literals work", function() {
   }};
   shouldCompileTo(string, [hash, helpers], "Message: Hello world 12 times: true false", "template with a simple String literal");
 });
+test("negative number literals work", function() {
+  var string   = 'Message: {{hello -12}}';
+  var hash     = {};
+  var helpers  = {hello: function(times) {
+    if(typeof times !== 'number') { times = "NaN"; }
+    return "Hello " + times + " times";
+  }};
+  shouldCompileTo(string, [hash, helpers], "Message: Hello -12 times", "template with a negative integer literal");
+});
+
 
 test("using a quote in the middle of a parameter raises an error", function() {
   shouldThrow(function() {
diff --git a/spec/tokenizer_spec.rb b/spec/tokenizer_spec.rb
index cb7f6eb09..9e189280a 100644
--- a/spec/tokenizer_spec.rb
+++ b/spec/tokenizer_spec.rb
@@ -235,6 +235,10 @@ def tokenize(string)
     result = tokenize(%|{{ foo 1 }}|)
     result.should match_tokens(%w(OPEN ID INTEGER CLOSE))
     result[2].should be_token("INTEGER", "1")
+
+    result = tokenize(%|{{ foo -1 }}|)
+    result.should match_tokens(%w(OPEN ID INTEGER CLOSE))
+    result[2].should be_token("INTEGER", "-1")
   end
 
   it "tokenizes booleans" do
diff --git a/src/handlebars.l b/src/handlebars.l
index 04c7c4c2b..b32e39c64 100644
--- a/src/handlebars.l
+++ b/src/handlebars.l
@@ -42,7 +42,7 @@
 <mu>"@"[a-zA-Z]+                 { yytext = yytext.substr(1); return 'DATA'; }
 <mu>"true"/[}\s]                 { return 'BOOLEAN'; }
 <mu>"false"/[}\s]                { return 'BOOLEAN'; }
-<mu>[0-9]+/[}\s]                 { return 'INTEGER'; }
+<mu>\-?[0-9]+/[}\s]              { return 'INTEGER'; }
 <mu>[a-zA-Z0-9_$-]+/[=}\s\/.]    { return 'ID'; }
 <mu>'['[^\]]*']'                 { yytext = yytext.substr(1, yyleng-2); return 'ID'; }
 <mu>.                            { return 'INVALID'; }