Class: Middleman::TemplateRenderer

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Contracts
Defined in:
lib/middleman-core/template_renderer.rb

Defined Under Namespace

Classes: Cache, TemplateNotFound

Constant Summary

Constants included from Contracts

Contracts::PATH_MATCHER

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Contracts

#Contract

Constructor Details

#initialize(app, path) ⇒ TemplateRenderer

Returns a new instance of TemplateRenderer.



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# File 'lib/middleman-core/template_renderer.rb', line 103

def initialize(app, path)
  @app = app
  @path = path
end

Class Method Details

.cache ⇒ Object 



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# File 'lib/middleman-core/template_renderer.rb', line 27

def self.cache
  @_cache ||= Cache.new
end

.locate_layout(app, name, preferred_engine = nil) ⇒ Object 



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# File 'lib/middleman-core/template_renderer.rb', line 36

def self.locate_layout(app, name, preferred_engine=nil)
  resolve_opts = {}
  resolve_opts[:preferred_engine] = preferred_engine unless preferred_engine.nil?

  # Check layouts folder
  layout_file = resolve_template(app, File.join(app.config[:layouts_dir], name.to_s), resolve_opts)

  # If we didn't find it, check root
  layout_file = resolve_template(app, name, resolve_opts) unless layout_file

  # Return the path
  layout_file
end

.resolve_template(app, request_path, options = {}) ⇒ Object 



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# File 'lib/middleman-core/template_renderer.rb', line 55

def self.resolve_template(app, request_path, options={})
  # Find the path by searching
  relative_path = Util.strip_leading_slash(request_path.to_s)

  # By default, any engine will do
  preferred_engines = []

  # If we're specifically looking for a preferred engine
  if options.key?(:preferred_engine)
    extension_class = ::Middleman::Util.tilt_class(options[:preferred_engine])

    # Get a list of extensions for a preferred engine
    preferred_engines += ::Tilt.mappings.select do |_, engines|
      engines.include? extension_class
    end.keys
  end

  preferred_engines << '*'
  preferred_engines << nil if options[:try_static]

  found_template = nil

  preferred_engines.each do |preferred_engine|
    path_with_ext = relative_path.dup
    path_with_ext << ('.' + preferred_engine) unless preferred_engine.nil?

    globbing = preferred_engine == '*'

    # Cache lookups in build mode only
    file = if app.build?
      cache.fetch(path_with_ext, preferred_engine) do
        app.files.find(:source, path_with_ext, globbing)
      end
    else
      app.files.find(:source, path_with_ext, globbing)
    end

    found_template = file if file && (preferred_engine.nil? || ::Middleman::Util.tilt_class(file[:full_path].to_s))
    break if found_template
  end

  # If we found one, return it
  found_template
end

Instance Method Details

#Hash ⇒ String

Render a template, with layout, given a path

Parameters:

Returns:

  • (String) 


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# File 'lib/middleman-core/template_renderer.rb', line 113

Contract Hash, Hash => String

#render(locs = {}, opts = {}, &block) ⇒ Object 



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# File 'lib/middleman-core/template_renderer.rb', line 114

def render(locs={}, opts={}, &block)
  path = @path.dup
  locals = locs.dup.freeze
  options = opts.dup

  extension = File.extname(path)
  engine = extension[1..-1].to_sym

  if defined?(::I18n)
    old_locale = ::I18n.locale
    ::I18n.locale = options[:locale] if options[:locale]

    # Backwards compat
    ::I18n.locale = options[:lang] if options[:lang]
  end

  # Sandboxed class for template eval
  context = @app.template_context_class.new(@app, locals, options)

  # Add extension helpers to context.
  @app.extensions.add_exposed_to_context(context)

  locals.each do |k, _|
    next unless context.respond_to?(k) && ![:current_path, :paginate, :page_articles, :blog_controller, :lang, :locale].include?(k.to_sym)

    msg = "Template local `#{k}` tried to overwrite an existing context value. Please rename the key when passing to `locals`"

    if @app.build?
      throw msg
    else
      @app.logger.error(msg)
    end
  end

  content = ::Middleman::Util.instrument 'builder.output.resource.render-template', path: File.basename(path) do
    _render_with_all_renderers(path, locals, context, options, &block)
  end

  # If we need a layout and have a layout, use it
  layout_file = fetch_layout(engine, options)
  if layout_file
    content = if layout_file = fetch_layout(engine, options)
      layout_renderer = ::Middleman::FileRenderer.new(@app, layout_file[:relative_path].to_s)

      ::Middleman::Util.instrument 'builder.output.resource.render-layout', path: File.basename(layout_file[:relative_path].to_s) do
        layout_renderer.render(locals, options, context) { content }
      end
    else
      content
    end
  end

  # Return result
  content
ensure
  # Pop all the saved variables from earlier as we may be returning to a
  # previous render (layouts, partials, nested layouts).
  ::I18n.locale = old_locale if defined?(::I18n)
end