Class: Stache::Mustache::Handler

Inherits:
Object
  • Object
show all
Includes:
Util.av_template_class(:Handlers)::Compilable
Defined in:
lib/stache/mustache/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/mustache/handler.rb', line 83

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

Instance Method Details

#compile(template) ⇒ Object

Thanks to Mustache::Rails3 for getting us most of the way home here



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# File 'lib/stache/mustache/handler.rb', line 14

def compile(template)
  #
  # get a custom Mustache, or the default Stache::Mustache::View
  mustache_class = mustache_class_from_template(template)

  # If the class is in the same directory as the template, the source of the template can be the
  # source of the class, and so we need to read the template source from the file system.
  # Matching against `module` may seem a bit hackish, but at worst it provides false positives
  # only for templates containing the word `module`, and reads the template again from the file
  # system.

  template_is_class = template.source.match(/module/) ? true : false
  virtual_path      = template.virtual_path.to_s

  # Caching key
  template_id = "#{template.identifier.to_s}#{template.updated_at.to_i}"

  # Return a string that will be eval'd in the context of the ActionView, ugly, but it works.
  <<-MUSTACHE
    mustache = ::#{mustache_class}.new
    mustache.view = self

    mustache.virtual_path = '#{virtual_path}'
    mustache[:yield] = content_for(:layout)
    mustache.context.push(local_assigns)
    variables = controller.instance_variables
    variables.delete(:@template)
    variables -= controller.class.protected_instance_variables.to_a

    variables.each do |name|
      mustache.instance_variable_set(name, controller.instance_variable_get(name))
    end

    # Add view instance variables also so RSpec view spec assigns will work
    (instance_variable_names - variables).each do |name|
      mustache.instance_variable_set(name, instance_variable_get(name))
    end

    # Declaring an +attr_reader+ for each instance variable in the
    # Stache::Mustache::View subclass makes them available to your templates.
    mustache.singleton_class.class_eval do
      attr_reader *variables.map { |name| name.to_s.sub(/^@/, '').to_sym }
    end

    # Try to get template from cache, otherwise use template source
    template_cached   = ::Stache.template_cache.read(:'#{template_id}', :namespace => :templates, :raw => true)
    mustache.template = template_cached || Stache::Mustache::CachedTemplate.new(
      if #{template_is_class}
        template_name = "#{virtual_path}"
        file = Dir.glob(File.join(::Stache.template_base_path, template_name + "\.*" + mustache.template_extension)).first
        File.read(file)
      else
        '#{template.source.gsub(/'/, "\\\\'")}'
      end
    )

    # Render - this will also compile the template
    compiled = mustache.render.html_safe

    # Store the now compiled template
    unless template_cached
      ::Stache.template_cache.write(:'#{template_id}', mustache.template, :namespace => :templates, :raw => true)
    end

    compiled
  MUSTACHE
end

#mustache_class_from_template(template) ⇒ Object

suss out a constant name for the given template



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# File 'lib/stache/mustache/handler.rb', line 88

def mustache_class_from_template(template)
  # If we don't have a source template to render, return an abstract view class.
  # This is normally used with rspec-rails. You probably never want to normally
  # render a bare Stache::View
  if template.source.empty?
    return Stache::Mustache::View
  end

  const_name = ActiveSupport::Inflector.camelize(ActiveSupport::Inflector.underscore(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
    e_const_name = e.message.match(/ ([^ ]*)$/)[1]
    if const_name.match(/#{e_const_name}(::|$)/)
      Stache::Mustache::View
    else
      raise e
    end
  end
end