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The Compiler class handles compilation of multiple files and/or directories, including checking which CSS files are out-of-date and need to be updated and calling Sass to perform the compilation on those files.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

#clean(individual_files = [])

Remove all output files that would be created by calling update_stylesheets, if they exist.

This method runs the deleting_css and deleting_sourcemap callbacks for the files that are deleted.

Parameters:

  • individual_files (Array<(String, 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. The third string, if provided, is the location of the Sourcemap file.



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# File 'lib/sass/plugin/compiler.rb', line 364

def clean(individual_files = [])
  file_list(individual_files).each do |(_, css_file, sourcemap_file)|
    if File.exist?(css_file)
      run_deleting_css css_file
      File.delete(css_file)
    end
    if sourcemap_file && File.exist?(sourcemap_file)
      run_deleting_sourcemap sourcemap_file
      File.delete(sourcemap_file)
    end
  end
  nil
end

#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 341

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

#file_list(individual_files = []) ⇒ Array<(String, String, String)>

Construct a list of files that might need to be compiled from the provided individual_files and the template_locations.

Note: this method does not cache the results as they can change across invocations when sass files are added or removed.

Parameters:

  • individual_files (Array<(String, 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. The third string, if provided, is the location of the Sourcemap file.

Returns:

  • (Array<(String, String, String)>) —

    A list of [sass_file, css_file, sourcemap_file] tuples similar to what was passed in, but expanded to include the current state of the directories being updated.



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# File 'lib/sass/plugin/compiler.rb', line 239

def file_list(individual_files = [])
  files = individual_files.map do |tuple|
    if tuple.size < 3
      [tuple[0], tuple[1], Sass::Util.sourcemap_name(tuple[1])]
    else
      tuple
    end
  end

  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]
      files << [file, css, sourcemap]
    end
  end
  files
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 348

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[, 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. The third string, if provided, is the location of the Sourcemap file.



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# File 'lib/sass/plugin/compiler.rb', line 200

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

  files = file_list(individual_files)
  run_updating_stylesheets(files)

  updated_stylesheets = []
  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)
      # XXX For consistency, this should return the sourcemap too, but it would
      # XXX be an API change.
      updated_stylesheets << [file, css]
      update_stylesheet(file, css, sourcemap)
    else
      run_not_updating_stylesheet(file, css, sourcemap)
    end
  end
  run_updated_stylesheets(updated_stylesheets)
end

#watch(individual_files = [], options = {})

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[, 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. The third string, if provided, is the location of the Sourcemap file.

  • options (Hash) (defaults to: {}) —

    The options that control how watching works.

Options Hash (options):

  • :skip_initial_update (Boolean) —

    Don't do an initial update when starting the watcher when true



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# File 'lib/sass/plugin/compiler.rb', line 288

def watch(individual_files = [], options = {})
  options, individual_files = individual_files, [] if individual_files.is_a?(Hash)
  update_stylesheets(individual_files) unless options[:skip_initial_update]

  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.
  unless Sass::Util.listen_geq_2?
    directories = directories.select {|d| File.directory?(d) && File.writable?(d)}
  end

  # TODO: Keep better track of what depends on what
  # so we don't have to run a global update every time anything changes.
  # XXX The :additional_watch_paths option exists for Compass to use until
  # a deprecated feature is removed. It may be removed without warning.
  listener_args = directories +
                  Array(options[:additional_watch_paths]) +
                  [{: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)
    yield(modified, added, removed) if block_given?
  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