Fix repeated delimiter escaping

spec/tokenizer_spec.rb

@@ -51,6 +51,15 @@ describe "Tokenizer" do
     result[4].should be_token("CONTENT", "{{bar}} ")
   end
 
+  it "supports escaping multiple delimiters" do
+    result = tokenize("{{foo}} \\{{bar}} \\{{baz}}")
+    result.should match_tokens(%w(OPEN ID CLOSE CONTENT CONTENT CONTENT))
+
+    result[3].should be_token("CONTENT", " ")
+    result[4].should be_token("CONTENT", "{{bar}} ")
+    result[5].should be_token("CONTENT", "{{baz}}")
+  end
+
   it "supports escaping a triple stash" do
     result = tokenize("{{foo}} \\{{{bar}}} {{baz}}")
     result.should match_tokens(%w(OPEN ID CLOSE CONTENT CONTENT OPEN ID CLOSE))

src/handlebars.l

@@ -11,7 +11,11 @@
 
 [^\x00]+                         { return 'CONTENT'; }
 
-<emu>[^\x00]{2,}?/("{{")         { this.popState(); return 'CONTENT'; }
+<emu>[^\x00]{2,}?/("{{"|<<EOF>>) {
+                                   if(yytext.slice(-1) !== "\\") this.popState();
+                                   if(yytext.slice(-1) === "\\") yytext = yytext.substr(0,yyleng-1);
+                                   return 'CONTENT';
+                                 }
 
 <mu>"{{>"                        { return 'OPEN_PARTIAL'; }
 <mu>"{{#"                        { return 'OPEN_BLOCK'; }