Make the ID node capable of handling paths

TODO: handle invalid paths in the tokenizer or parser
  TODO: invalidate "{{ foo/ bar }}"

lib/handlebars/handlebars_lexer.js

@@ -33,6 +33,11 @@ Handlebars.HandlebarsLexer.prototype.lex = function() {
   if(lookahead === "") return;
 
   if(this.state == "MUSTACHE") {
+    if(this.peek() === "/") {
+      this.getchar();
+      return "SEP";
+    }
+
     // chomp optional whitespace
     while(this.peek() === " ") { this.ignorechar(); }
 
@@ -64,7 +69,7 @@ Handlebars.HandlebarsLexer.prototype.lex = function() {
     // All other cases are IDs or errors
     } else {
       // grab alphanumeric characters
-      while(this.peek().match(/[0-9A-Za-z]/)) { this.getchar() }
+      while(this.peek().match(/[0-9A-Za-z\.]/)) { this.getchar() }
 
       // if any characters were grabbed => ID
       if(this.yytext.length) { return "ID" }

lib/handlebars/printer.js

@@ -79,7 +79,12 @@ Handlebars.PrintVisitor.prototype.STRING = function(string) {
 };
 
 Handlebars.PrintVisitor.prototype.ID = function(id) {
-  return "ID:" + id.id;
+  var path = id.id.join("/");
+  if(id.id.length > 1) {
+    return "PATH:" + path;
+  } else {
+    return "ID:" + path;
+  }
 };
 
 Handlebars.PrintVisitor.prototype.content = function(content) {

spec/tokenizer_spec.rb

@@ -36,6 +36,12 @@ describe "Tokenizer" do
     result[1].should be_token("ID", "foo")
   end
 
+  it "tokenizes a path as 'OPEN ID CLOSE'" do
+    result = tokenize("{{../foo/bar}}")
+    result.should match_tokens(%w(OPEN ID SEP ID SEP ID CLOSE))
+    result[1].should be_token("ID", "..")
+  end
+
   it "tokenizes a simple mustahe with spaces as 'OPEN ID CLOSE'" do
     result = tokenize("{{  foo  }}")
     result.should match_tokens(%w(OPEN ID CLOSE))

src/handlebars.yy

@@ -29,7 +29,7 @@ openBlock
   ;
 
 closeBlock
-  : OPEN_ENDBLOCK id CLOSE { }
+  : OPEN_ENDBLOCK path CLOSE { }
   ;
 
 mustache
@@ -37,7 +37,7 @@ mustache
   ;
 
 partial
-  : OPEN_PARTIAL id CLOSE { $$ = new yy.PartialNode($2) }
+  : OPEN_PARTIAL path CLOSE { $$ = new yy.PartialNode($2) }
   ;
 
 simpleInverse
@@ -45,8 +45,8 @@ simpleInverse
   ;
 
 inMustache
-  : id params { $$ = [$1].concat($2) }
-  | id { $$ = [$1] }
+  : path params { $$ = [$1].concat($2) }
+  | path { $$ = [$1] }
   ;
 
 params
@@ -55,11 +55,16 @@ params
   ;
 
 param
-  : id { $$ = $1 }
+  : path { $$ = $1 }
   | STRING { $$ = new yy.StringNode($1) }
   ;
 
-id
-  : ID { $$ = new yy.IdNode($1) }
+path
+  : pathSegments { $$ = new yy.IdNode($1) }
+  ;
+
+pathSegments
+  : pathSegments SEP ID { $1.push($3); $$ = $1; }
+  | ID { $$ = [$1] }
   ;
 

test.js

@@ -2,7 +2,7 @@ require.paths.push(__dirname + "/lib");
 
 var Handlebars = require("handlebars").Handlebars;
 
-var string = "foo {{ bar baz \"baz\" }}baz{{! foo bar baz }}{{#foo}} bar {{^}} baz {{/foo}}{{> partial }}{{# bar }}part1 {{^}} part2{{> foo }}{{/bar}}zomg"
+var string = "foo {{ bar ../baz/bat/bam \"baz\" }}baz{{! foo bar baz }}{{#foo}} bar {{^}} baz {{/foo}}{{> partial }}{{# bar }}part1 {{^}} part2{{> foo }}{{/bar}}zomg"
 
 var ast = Handlebars.parse(string);
 require("sys").print(Handlebars.print(ast));