Class: Sass::Source::Map

Inherits:
Object
  • Object
show all
Defined in:
lib/sass/source/map.rb

Defined Under Namespace

Classes: Mapping

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Map

Returns a new instance of Map.



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# File 'lib/sass/source/map.rb', line 23

def initialize
  @data = []
end

Instance Attribute Details

#data ⇒ Array<Mapping> (readonly)

The mapping data ordered by the location in the target.

Returns:



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# File 'lib/sass/source/map.rb', line 21

def data
  @data
end

Instance Method Details

#add(input, output)

Adds a new mapping from one source range to another. Multiple invocations of this method should have each output range come after all previous ranges.

Parameters:



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# File 'lib/sass/source/map.rb', line 34

def add(input, output)
  @data.push(Mapping.new(input, output))
end

#shift_output_lines(delta)

Shifts all output source ranges forward one or more lines.

Parameters:

  • delta (Integer) —

    The number of lines to shift the ranges forward.



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# File 'lib/sass/source/map.rb', line 41

def shift_output_lines(delta)
  return if delta == 0
  @data.each do |m|
    m.output.start_pos.line += delta
    m.output.end_pos.line += delta
  end
end

#shift_output_offsets(delta)

Shifts any output source ranges that lie on the first line forward one or more characters on that line.

Parameters:

  • delta (Integer) —

    The number of characters to shift the ranges forward.



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# File 'lib/sass/source/map.rb', line 54

def shift_output_offsets(delta)
  return if delta == 0
  @data.each do |m|
    break if m.output.start_pos.line > 1
    m.output.start_pos.offset += delta
    m.output.end_pos.offset += delta if m.output.end_pos.line > 1
  end
end

#to_json(options) ⇒ String

Returns the standard JSON representation of the source map.

If the :css_uri option isn't specified, the :css_path and :sourcemap_path options must both be specified. Any options may also be specified alongside the :css_uri option. If :css_uri isn't specified, it will be inferred from :css_path and :sourcemap_path using the assumption that the local file system has the same layout as the server.

Regardless of which options are passed to this method, source stylesheets that are imported using a non-default importer will only be linked to in the source map if their importers implement Importers::Base#public_url.

Parameters:

  • options (Hash) —

    a customizable set of options

Options Hash (options):

  • :css_uri (String) —

    The publicly-visible URI of the CSS output file.

  • :css_path (String) —

    The local path of the CSS output file.

  • :sourcemap_path (String) —

    The (eventual) local path of the sourcemap file.

  • :type (Symbol) —

    :auto (default), :file, or :inline.

Returns:

  • (String) —

    The JSON string.

Raises:

  • (ArgumentError) —

    If neither :css_uri nor :css_path and :sourcemap_path are specified.



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# File 'lib/sass/source/map.rb', line 87

def to_json(options)
  css_uri, css_path, sourcemap_path =
    options[:css_uri], options[:css_path], options[:sourcemap_path]
  unless css_uri || (css_path && sourcemap_path)
    raise ArgumentError.new("Sass::Source::Map#to_json requires either " \
      "the :css_uri option or both the :css_path and :soucemap_path options.")
  end
  css_path &&= Sass::Util.pathname(File.absolute_path(css_path))
  sourcemap_path &&= Sass::Util.pathname(File.absolute_path(sourcemap_path))
  css_uri ||= Sass::Util.file_uri_from_path(
    Sass::Util.relative_path_from(css_path, sourcemap_path.dirname))

  result = "{\n"
  write_json_field(result, "version", 3, true)

  source_uri_to_id = {}
  id_to_source_uri = {}
  id_to_contents = {} if options[:type] == :inline
  next_source_id = 0
  line_data = []
  segment_data_for_line = []

  # These track data necessary for the delta coding.
  previous_target_line = nil
  previous_target_offset = 1
  previous_source_line = 1
  previous_source_offset = 1
  previous_source_id = 0

  @data.each do |m|
    file, importer = m.input.file, m.input.importer

    next unless importer

    if options[:type] == :inline
      source_uri = file
    else
      sourcemap_dir = sourcemap_path && sourcemap_path.dirname.to_s
      sourcemap_dir = nil if options[:type] == :file
      source_uri = importer.public_url(file, sourcemap_dir)
      next unless source_uri
    end

    current_source_id = source_uri_to_id[source_uri]
    unless current_source_id
      current_source_id = next_source_id
      next_source_id += 1

      source_uri_to_id[source_uri] = current_source_id
      id_to_source_uri[current_source_id] = source_uri

      if options[:type] == :inline
        id_to_contents[current_source_id] =
          importer.find(file, {}).instance_variable_get('@template')
      end
    end

    [
      [m.input.start_pos, m.output.start_pos],
      [m.input.end_pos, m.output.end_pos]
    ].each do |source_pos, target_pos|
      if previous_target_line != target_pos.line
        line_data.push(segment_data_for_line.join(",")) unless segment_data_for_line.empty?
        (target_pos.line - 1 - (previous_target_line || 0)).times {line_data.push("")}
        previous_target_line = target_pos.line
        previous_target_offset = 1
        segment_data_for_line = []
      end

      # `segment` is a data chunk for a single position mapping.
      segment = ""

      # Field 1: zero-based starting offset.
      segment << Sass::Util.encode_vlq(target_pos.offset - previous_target_offset)
      previous_target_offset = target_pos.offset

      # Field 2: zero-based index into the "sources" list.
      segment << Sass::Util.encode_vlq(current_source_id - previous_source_id)
      previous_source_id = current_source_id

      # Field 3: zero-based starting line in the original source.
      segment << Sass::Util.encode_vlq(source_pos.line - previous_source_line)
      previous_source_line = source_pos.line

      # Field 4: zero-based starting offset in the original source.
      segment << Sass::Util.encode_vlq(source_pos.offset - previous_source_offset)
      previous_source_offset = source_pos.offset

      segment_data_for_line.push(segment)

      previous_target_line = target_pos.line
    end
  end
  line_data.push(segment_data_for_line.join(","))
  write_json_field(result, "mappings", line_data.join(";"))

  source_names = []
  (0...next_source_id).each {|id| source_names.push(id_to_source_uri[id].to_s)}
  write_json_field(result, "sources", source_names)

  if options[:type] == :inline
    write_json_field(result, "sourcesContent",
      (0...next_source_id).map {|id| id_to_contents[id]})
  end

  write_json_field(result, "names", [])
  write_json_field(result, "file", css_uri)

  result << "\n}"
  result
end