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Sass::Plugin::Compiler

The Compiler class handles compilation of multiple files and/or directories, including checking which CSS files are out-of-date and need to be updated and calling Sass to perform the compilation on those files.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

Public Class Methods

new(opts = {}) click to toggle source

Creates a new compiler.

@param opts [{Symbol => Object}]

See {file:SASS_REFERENCE.md#sass_options the Sass options documentation}.
# File lib/sass/plugin/compiler.rb, line 35
def initialize(opts = {})
  options.merge!(opts)
end

Public Instance Methods

engine_options(additional_options = {}) click to toggle source

Non-destructively modifies {#options} so that default values are properly set, and returns the result.

@param additional_options [{Symbol => Object}] An options hash with which to merge {#options} @return [{Symbol => Object}] The modified options hash

# 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) click to toggle source

Compass expects this to exist

# 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 = []) click to toggle source

Updates out-of-date stylesheets.

Checks each Sass/SCSS file in {file:SASS_REFERENCE.md#template_location-option `:template_location`} to see if it’s been modified more recently than the corresponding CSS file in {file:SASS_REFERENCE.md#css_location-option `:css_location`}. If it has, it updates the CSS file.

@param individual_files [Array<(String, String)>]

A list of files to check for updates
**in addition to those specified by the
{file:SASS_REFERENCE.md#template_location-option `: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.
# 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 = []) click to toggle source

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 {file:SASS_REFERENCE.md#template_location-option `:template_location`}, the corresponding CSS file in {file:SASS_REFERENCE.md#css_location-option `: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](github.com/guard/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.

@param individual_files [Array<(String, String)>]

A list of files to watch for updates
**in addition to those specified by the
{file:SASS_REFERENCE.md#template_location-option `: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.
# 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

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