Contents

require 'curly/invalid_reference'

module Curly
  class Compiler
    REFERENCE_REGEX = %r(\{\{([\w\.]+)\}\})

    class << self

      # Compiles a Curly template to Ruby code.
      #
      # template - The template String that should be compiled.
      #
      # Returns a String containing the Ruby code.
      def compile(template, presenter_class)
        source = template.inspect
        source.gsub!(REFERENCE_REGEX) { compile_reference($1, presenter_class) }

        source
      end

      # Whether the Curly template is valid. This includes whether all
      # references are available on the presenter class.
      #
      # template        - The template String that should be validated.
      # presenter_class - The presenter Class.
      #
      # Returns true if the template is valid, false otherwise.
      def valid?(template, presenter_class)
        compile(template, presenter_class)

        true
      rescue InvalidReference
        false
      end

      private

      def compile_reference(reference, presenter_class)
        method, argument = reference.split(".", 2)

        unless presenter_class.method_available?(method.to_sym)
          raise Curly::InvalidReference.new(method.to_sym)
        end

        if presenter_class.instance_method(method).arity == 1
          # The method accepts a single argument -- pass it in.
          code = <<-RUBY
            presenter.#{method}(#{argument.inspect}) {|*args| yield(*args) }
          RUBY
        else
          code = <<-RUBY
            presenter.#{method} {|*args| yield(*args) }
          RUBY
        end

        '#{ERB::Util.html_escape(%s)}' % code.strip
      end
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
curly-templates-0.9.0	lib/curly/compiler.rb
curly-templates-0.8.0	lib/curly/compiler.rb
curly-templates-0.7.0	lib/curly/compiler.rb