Add functions

grammar.coffee

@@ -33,7 +33,8 @@ module.exports = compiler.grammar
       @null,
       @undefined,
       @object,
-      @array)
+      @array,
+      @function)
 
     object: -> seq(
       "{",
@@ -43,6 +44,21 @@ module.exports = compiler.grammar
         @expression))
       "}")
 
+    function: -> seq(
+      keyword("function"),
+      @formal_parameters,
+      @statement_block)
+
+    formal_parameters: -> seq(
+      "(",
+      commaSep(@identifier),
+      ")")
+
+    statement_block: -> seq(
+      "{",
+      repeat(@statement),
+      "}")
+
     array: -> seq(
       "[",
       commaSep(@expression)

grammar_test/expressions.txt

@@ -104,3 +104,21 @@ Arrays
   (expression_statement (array))
   (expression_statement (array (string)))
   (expression_statement (array (string) (identifier))))
+
+============================================
+Functions
+============================================
+
+function() {};
+function(arg1, arg2) {
+  arg2;
+};
+
+---
+
+(program
+  (expression_statement (function (formal_parameters) (statement_block)))
+  (expression_statement (function
+    (formal_parameters (identifier) (identifier))
+    (statement_block
+      (expression_statement (identifier))))))