Daves crappy javascript treetop grammar

# https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference

grammar JS
  rule program
     (spacing statement spacing)*
  end

  rule statement
    block / function / if_else / for_in / for / ternary / let / [^;\{\}]+ ';' {
        def statements
            [ @interval ] << super
        end
    }
  end
  
  rule function
    'function' spacing name:[^ \(]* spacing '(' function_params ')' spacing block
  end

  rule block
    '{' spacing (spacing statement spacing)* spacing '}'
  end

  rule if_else
    if_part:('if' spacing '(' [^\)]+ ')') spacing (block / statement) (spacing 'else' spacing (block / statement))?  {
        def statements
          [ if_part.interval ] << super
        end
    }
  end

  rule let
    lhs:(lhs)? spacing rhs:expression spacing ';' {
        def statements
            interval = rhs.statements.length > 0 ? lhs.interval : @interval
            [ interval ] << super
        end
    }
  end
  
  rule ternary
    first:(lhs spacing condition:expression) spacing '?' spacing second:expression spacing ':' spacing third:expression spacing ';' {
      def statements
        [ first.interval, second.interval, third.interval ]
      end
    }
  end
  
  rule expression
    function / hash / bool / string / number / function_call / [^,\)\}]+
  end

  rule function_call
    named_function_call 
      / 
      anonymous_function_call
  end
  
  rule anonymous_function_call
    '(' spacing function spacing ')' spacing function_args
  end
  
  rule named_function_call
    function_name spacing function_args
  end
  
  rule function_name
    [^\(]+
  end
  
  rule function_args
    '(' spacing (expression (spacing ',' spacing expression)*)? spacing ')'
  end
  
  rule for
    'for' spacing '(' spacing initial_expression:([^;\{\}]+ ';') spacing condition:([^;\{\}]+ ';') spacing final_expression:([^;\{\}\)]+) ')' spacing (block / statement) {
      def statements
        [ initial_expression.interval, condition.interval, final_expression.interval ] << super
      end
    }
  end
  
  rule for_in
    initial_statement:('for' spacing '(' spacing declaration spacing 'in' spacing expression spacing ')') spacing spacing (block / statement) {
      def statements
        [ initial_statement.interval ] << super
      end
    }
  end
  
  rule lhs
    declaration spacing '=' 
  end
  
  rule declaration
    'var'? spacing [^ ]+
  end
    
  rule hash
    '{' (spacing hash_entry spacing ','? spacing)* '}'
  end

  rule hash_entry
    label:[^ \:]+ spacing ':' spacing expression  
  end

  rule function_params
    [^\(\)]*
  end
  
  rule string
    double_quoted_string / single_quoted_string
  end
  
  rule number
    [1-9]+ [0-9]* / '0'
  end
  
  rule bool
    'true' / 'false'
  end
  
  rule double_quoted_string
    '"' (!'"' . / '\"')* '"'
  end

  rule single_quoted_string
    "'" (!"'" . / "\'")* "'"
  end

  rule spacing
    (space / single_line_comment / multi_line_comment)*
  end

  rule forced_spacing
    (space / single_line_comment / multi_line_comment)+
  end

  rule single_line_comment
    "//" line_to_eol
  end

  rule multi_line_comment
    "/*" ('*' !'/' / !'*' .)* "*/"
  end

  rule line_to_eol
    (!eol .)*
  end

  rule space
    [ \t\f] / eol
  end
  
  rule eol
    ("\r" "\n"?) / "\n"
  end
end