Treetop AST quirks

ast_quirks.rb

require 'treetop'

Treetop.load 'ast_quirks.treetop'

parser = SimpleExpressionParser.new
ast = parser.parse %q{42}
p ast.to_code

ast_quirks.treetop

grammar SimpleExpression
  rule expression
    ( string / number ) {
      def to_code
        elements.first.to_code
      end
    }
  end

  rule string
    '"' ( !'"' . / '\"' )* '"' {
      def to_code; text_value; end
    }
  end

  rule number
    [0-9]+ {
      def to_code; text_value.to_i; end
    }
  end
end

ast_quirks_fixed.treetop

grammar SimpleExpression
  rule expression
    ( string / number ) 1..1 {
      def to_code
        elements.first.to_code
      end
    }
  end

  rule string
    '"' ( !'"' . / '\"' )* '"' {
      def to_code; text_value; end
    }
  end

  rule number
    [0-9]+ {
      def to_code; text_value.to_i; end
    }
  end
end