Class: Stache::Handlebars::Handler

Inherits:
Object
  • Object
show all
Includes:
Util.av_template_class(:Handlers)::Compilable
Defined in:
lib/stache/handlebars/handler.rb

Overview

From HAML, thanks a bunch, guys! In Rails 3.1+, template handlers don’t inherit from anything. In <= 3.0, they do. To avoid messy logic figuring this out, we just inherit from whatever the ERB handler does.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.call(template) ⇒ Object

In Rails 3.1+, #call takes the place of #compile



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# File 'lib/stache/handlebars/handler.rb', line 66

def self.call(template)
  new.compile(template)
end

Instance Method Details

#compile(template) ⇒ Object 



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# File 'lib/stache/handlebars/handler.rb', line 13

def compile(template)
  handlebars_class = handlebars_class_from_template(template)
  <<-RUBY_CODE
    handlebars = ::#{handlebars_class}.new
    handlebars.view = self

    handlebars.register_helper('helperMissing') do |name, *args|
      meth, *params, options = args

      if handlebars.respond_to?(meth)
        handlebars.send(meth, *params)
      elsif self.respond_to?(meth)
        self.send(meth, *params)
      elsif params.size == 0
        ""
      else
        raise "Could not find property '\#\{meth\}'"
      end
    end

    handlebars.register_helper('yield') do |name, *args|
      content_for(:layout)
    end

    template = handlebars.compile('#{template.source.gsub(/'/, "\\\\'")}');
    vars = {}
    partial_renderer = @view_renderer.send(:_partial_renderer)
    vars.merge!(@_assigns)
    vars.merge!(partial_renderer.instance_variable_get('@locals') || {})
    options = partial_renderer.instance_variable_get('@options')
    vars.merge!(options[:context] || {}) if options

    handlebars.partial_missing do |name|
      search_path = '#{template.virtual_path}'.split("/")[0..-2]
      file = (search_path + [name]).join("/")
      finder = lambda do |partial|
        self.lookup_context.find(file, [], partial, [], {:formats => [:html]})
      end
      template = finder.call(false) rescue finder.call(true)

      if template
        t = handlebars.compile(template.source)
        t.call(vars).html_safe
      else
        raise "Could not find template '\#\{file\}'"
      end
    end

    template.call(vars).html_safe
  RUBY_CODE
end

#handlebars_class_from_template(template) ⇒ Object

suss out a constant name for the given template



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# File 'lib/stache/handlebars/handler.rb', line 71

def handlebars_class_from_template(template)
  const_name = ActiveSupport::Inflector.camelize(template.virtual_path.to_s)
  const_name = "#{Stache.wrapper_module_name}::#{const_name}" if Stache.wrapper_module_name

  begin
    const_name.constantize
  rescue NameError, LoadError => e
    # Only rescue NameError/LoadError concerning our mustache_class
    if e.message.match(/#{const_name}$/)
      Stache::Handlebars::View
    else
      raise e
    end
  end
end