Class: Opal::Processor

Inherits:
TiltTemplate show all
Defined in:
opal/lib/opal/sprockets/processor.rb

Overview

The Processor class is used to make ruby files (with rb or opal extensions) available to any sprockets based server. Processor will then get passed any ruby source file to build.

Direct Known Subclasses

ERB::Processor

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from TiltTemplate

compiler_options, #compiler_options, engine_initialized?, inherited, #initialize_engine, #prepare, version

Class Method Details

.load_asset_code(sprockets, name) ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 119

def self.load_asset_code(sprockets, name)
  asset = sprockets[name.sub(/(\.(js|rb|opal))*#{REGEXP_END}/, '.js')]
  return '' if asset.nil?

  opal_extnames = sprockets.engines.map do |ext, engine|
    ext if engine <= ::Opal::Processor
  end.compact

  module_name = -> asset { asset.logical_path.sub(/\.js#{REGEXP_END}/, '') }
  path_extnames = -> path { File.basename(path).scan(/\.[^.]+/) }
  mark_as_loaded = -> path { "Opal.mark_as_loaded(#{path.inspect});" }
  processed_by_opal = -> asset { (path_extnames[asset.pathname] & opal_extnames).any? }

  non_opal_assets = ([asset]+asset.dependencies)
    .select { |asset| not(processed_by_opal[asset]) }
    .map { |asset| module_name[asset] }

  mark_as_loaded = (['opal'] + non_opal_assets + stubbed_files.to_a)
    .map { |path| mark_as_loaded[path] }

  if processed_by_opal[asset]
    load_asset_code = "Opal.load(#{module_name[asset].inspect});"
  end

  <<-JS
  if (typeof(Opal) !== 'undefined') {
    #{mark_as_loaded.join("\n")}
    #{load_asset_code}
  }
  JS
end

.sprockets_extnames_regexp(sprockets) ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 56

def self.sprockets_extnames_regexp(sprockets)
  joined_extnames = (['.js']+sprockets.engines.keys).map { |ext| Regexp.escape(ext) }.join('|')
  Regexp.new("(#{joined_extnames})*$")
end

.stub_file(name) ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 155

def self.stub_file(name)
  stubbed_files << name.to_s
end

.stubbed_files ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 151

def self.stubbed_files
  @stubbed_files ||= Set.new
end

Instance Method Details

#evaluate(context, locals, &block) ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 22

def evaluate(context, locals, &block)
  return super unless context.is_a? ::Sprockets::Context

  @sprockets = sprockets = context.environment

  # In Sprockets 3 logical_path has an odd behavior when the filename is "index"
  # thus we need to bake our own logical_path
  filename = context.respond_to?(:filename) ? context.filename : context.pathname.to_s
  logical_path = filename.gsub(%r{^#{context.root_path}/?(.*?)#{sprockets_extnames_regexp}}, '\1')

  compiler_options = self.compiler_options.merge(file: logical_path)

  # Opal will be loaded immediately to as the runtime redefines some crucial
  # methods such that need to be implemented as soon as possible:
  #
  # E.g. It forwards .toString() to .$to_s() for Opal objects including Array.
  #      If .$to_s() is not implemented and some other lib is loaded before
  #      corelib/* .toString results in an `undefined is not a function` error.
  compiler_options.merge!(requirable: false) if logical_path == 'opal'

  compiler = Compiler.new(data, compiler_options)
  result = compiler.compile

  process_requires(compiler.requires, context)
  process_required_trees(compiler.required_trees, context)

  if Opal::Config.source_map_enabled
    map_contents = compiler.source_map.as_json.to_json
    ::Opal::SourceMapServer.set_map_cache(sprockets, logical_path, map_contents)
  end

  result.to_s
end

#process_required_trees(required_trees, context) ⇒ Object

Mimics (v2) Sprockets::DirectiveProcessor#process_require_tree_directive



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# File 'opal/lib/opal/sprockets/processor.rb', line 73

def process_required_trees(required_trees, context)
  return if required_trees.empty?

  # This is the root dir of the logical path, we need this because
  # the compiler gives us the path relative to the file's logical path.
  dirname = File.dirname(file).gsub(/#{Regexp.escape File.dirname(context.logical_path)}#{REGEXP_END}/, '')
  dirname = Pathname(dirname)

  required_trees.each do |original_required_tree|
    required_tree = Pathname(original_required_tree)

    unless required_tree.relative?
      raise ArgumentError, "require_tree argument must be a relative path: #{required_tree.inspect}"
    end

    required_tree = dirname.join(file, '..', required_tree)

    unless required_tree.directory?
      raise ArgumentError, "require_tree argument must be a directory: #{[original_required_tree, required_tree].inspect}"
    end

    context.depend_on required_tree.to_s

    environment = context.environment

    processor = ::Sprockets::DirectiveProcessor.new
    processor.instance_variable_set('@dirname', File.dirname(file))
    processor.instance_variable_set('@environment', environment)
    path = processor.__send__(:expand_relative_dirname, :require_tree, original_required_tree)
    absolute_paths = environment.__send__(:stat_sorted_tree_with_dependencies, path).first.map(&:first)

    absolute_paths.each do |path|
      path = Pathname(path)
      pathname = path.relative_path_from(dirname)

      if name.to_s == file
        next
      elsif path.directory?
        context.depend_on(path.to_s)
      else
        context.require_asset(pathname)
      end
    end
  end
end

#process_requires(requires, context) ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 65

def process_requires(requires, context)
  requires.each do |required|
    required = required.sub(sprockets_extnames_regexp, '')
    context.require_asset required unless stubbed_files.include? required
  end
end

#sprockets_extnames_regexp ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 61

def sprockets_extnames_regexp
  @sprockets_extnames_regexp ||= self.class.sprockets_extnames_regexp(@sprockets)
end

#stubbed_files ⇒ Object 



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# File 'opal/lib/opal/sprockets/processor.rb', line 159

def stubbed_files
  self.class.stubbed_files
end