Class: Sass::Plugin::Compiler

Inherits:
Object
  • Object
show all
Extended by:
Callbacks
Includes:
Configuration
Defined in:
lib/sass/plugin/compiler.rb

Overview

The Compiler class handles compilation of multiple files and/or directories, including checking which CSS files are out-of-date and need to be updated and calling Sass to perform the compilation on those files.

Sass::Plugin uses this class to update stylesheets for a single application. Unlike Sass::Plugin, though, the Compiler class has no global state, and so multiple instances may be created and used independently.

If you need to compile a Sass string into CSS, please see the Engine class.

Unlike Sass::Plugin, this class doesn't keep track of whether or how many times a stylesheet should be updated. Therefore, the following Sass::Plugin options are ignored by the Compiler:

  • :never_update
  • :always_check

Instance Method Summary collapse

Methods included from Callbacks

define_callback, extended

Methods included from Configuration

#add_template_location, #default_options, #options, #remove_template_location, #reset!, #template_location_array

Constructor Details

#initialize(opts = {}) ⇒ Compiler

Creates a new compiler.

Parameters:



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# File 'lib/sass/plugin/compiler.rb', line 35

def initialize(opts = {})
  options.merge!(opts)
end

Instance Method Details

#engine_options(additional_options = {}) ⇒ {Symbol => Object}

Non-destructively modifies Sass::Plugin::Configuration#options so that default values are properly set, and returns the result.

Parameters:

Returns:

  • ({Symbol => Object}) —

    The modified options hash



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# File 'lib/sass/plugin/compiler.rb', line 265

def engine_options(additional_options = {})
  opts = options.merge(additional_options)
  opts[:load_paths] = load_paths(opts)
  opts
end

#stylesheet_needs_update?(css_file, template_file) ⇒ Boolean

Compass expects this to exist

Returns:

  • (Boolean) 


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# File 'lib/sass/plugin/compiler.rb', line 272

def stylesheet_needs_update?(css_file, template_file)
  StalenessChecker.stylesheet_needs_update?(css_file, template_file)
end

#update_stylesheets(individual_files = [])

Updates out-of-date stylesheets.

Checks each Sass/SCSS file in :template_location to see if it's been modified more recently than the corresponding CSS file in :css_location. If it has, it updates the CSS file.

Parameters:

  • individual_files (Array<(String, String)>) (defaults to: []) —

    A list of files to check for updates in addition to those specified by the :template_location option. The first string in each pair is the location of the Sass/SCSS file, the second is the location of the CSS file that it should be compiled to.



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# File 'lib/sass/plugin/compiler.rb', line 171

def update_stylesheets(individual_files = [])
  individual_files = individual_files.dup
  Sass::Plugin.checked_for_updates = true
  staleness_checker = StalenessChecker.new(engine_options)

  template_location_array.each do |template_location, css_location|
    Sass::Util.glob(File.join(template_location, "**", "[^_]*.s[ca]ss")).sort.each do |file|
      # Get the relative path to the file
      name = file.sub(template_location.to_s.sub(/\/*$/, '/'), "")
      css = css_filename(name, css_location)
      sourcemap = Sass::Util.sourcemap_name(css) if engine_options[:sourcemap]
      individual_files << [file, css, sourcemap]
    end
  end

  individual_files.each do |file, css, sourcemap|
    # TODO: Does staleness_checker need to check the sourcemap file as well?
    if options[:always_update] || staleness_checker.stylesheet_needs_update?(css, file)
      update_stylesheet(file, css, sourcemap)
    else
      run_not_updating_stylesheet(file, css, sourcemap)
    end
  end
end

#watch(individual_files = [])

Watches the template directory (or directories) and updates the CSS files whenever the related Sass/SCSS files change. watch never returns.

Whenever a change is detected to a Sass/SCSS file in :template_location, the corresponding CSS file in :css_location will be recompiled. The CSS files of any Sass/SCSS files that import the changed file will also be recompiled.

Before the watching starts in earnest, watch calls #update_stylesheets.

Note that watch uses the Listen library to monitor the filesystem for changes. Listen isn't loaded until watch is run. The version of Listen distributed with Sass is loaded by default, but if another version has already been loaded that will be used instead.

Parameters:

  • individual_files (Array<(String, String)>) (defaults to: []) —

    A list of files to watch for updates in addition to those specified by the :template_location option. The first string in each pair is the location of the Sass/SCSS file, the second is the location of the CSS file that it should be compiled to.



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# File 'lib/sass/plugin/compiler.rb', line 220

def watch(individual_files = [])
  update_stylesheets(individual_files)

  directories = watched_paths
  individual_files.each do |(source, _, _)|
    directories << File.dirname(File.expand_path(source))
  end
  directories = remove_redundant_directories(directories)

  # A Listen version prior to 2.0 will write a test file to a directory to
  # see if a watcher supports watching that directory. That breaks horribly
  # on read-only directories, so we filter those out.
  directories.reject {|d| File.writable?(d)} unless Sass::Util.listen_geq_2?

  # TODO: Keep better track of what depends on what
  # so we don't have to run a global update every time anything changes.
  listener_args = directories + [{:relative_paths => false}]

  # The native windows listener is much slower than the polling option, according to
  # https://github.com/nex3/sass/commit/a3031856b22bc834a5417dedecb038b7be9b9e3e
  poll = @options[:poll] || Sass::Util.windows?
  if poll && Sass::Util.listen_geq_2?
    # In Listen 2.0.0 and on, :force_polling is an option. In earlier
    # versions, it's a method on the listener (called below).
    listener_args.last[:force_polling] = true
  end

  listener = create_listener(*listener_args) do |modified, added, removed|
    on_file_changed(individual_files, modified, added, removed)
  end

  if poll && !Sass::Util.listen_geq_2?
    # In Listen 2.0.0 and on, :force_polling is an option (set above). In
    # earlier versions, it's a method on the listener.
    listener.force_polling(true)
  end

  listen_to(listener)
end