lib/scss_lint/engine.rb in scss_lint-0.46.0 vs lib/scss_lint/engine.rb in scss_lint-0.47.0

@@ -1,7 +1,9 @@
 require 'sass'
 
+require 'open3'
+
 module SCSSLint
   class FileEncodingError < StandardError; end
 
   # Contains all information for a parsed SCSS file, including its name,
   # contents, and parse tree.
@@ -13,17 +15,18 @@
     # Creates a parsed representation of an SCSS document from the given string
     # or file.
     #
     # @param options [Hash]
     # @option options [String] :file The file to load
+    # @option options [String] :path The path of the file to load
     # @option options [String] :code The code to parse
+    # @option options [String] :preprocess_command A preprocessing command
+    # @option options [List<String>] :preprocess_files A list of files that should be preprocessed
     def initialize(options = {})
-      if options[:path]
-        build_from_file(options)
-      elsif options[:code]
-        build_from_string(options[:code])
-      end
+      @preprocess_command = options[:preprocess_command]
+      @preprocess_files = options[:preprocess_files]
+      build(options)
 
       # Need to force encoding to avoid Windows-related bugs.
       # Need to encode with universal newline to avoid other Windows-related bugs.
       # Need `to_a` for Ruby 1.9.3.
       encoding = 'UTF-8'
@@ -43,27 +46,47 @@
       end
     end
 
   private
 
+    def build(options)
+      if options[:path]
+        build_from_file(options)
+      elsif options[:code]
+        build_from_string(options[:code])
+      end
+    end
+
     # @param options [Hash]
     # @option file [IO] if provided, us this as the file object
     # @option path [String] path of file, loading from this if `file` object not
     #   given
     def build_from_file(options)
       @filename = options[:path]
       @contents = options[:file] ? options[:file].read : File.read(@filename)
+      preprocess_contents
       @engine = Sass::Engine.new(@contents, ENGINE_OPTIONS.merge(filename: @filename))
     end
 
     # @param scss [String]
     def build_from_string(scss)
-      @engine = Sass::Engine.new(scss, ENGINE_OPTIONS)
       @contents = scss
+      preprocess_contents
+      @engine = Sass::Engine.new(@contents, ENGINE_OPTIONS)
     end
 
     def find_any_control_commands
       @any_control_commands =
         @lines.any? { |line| line['scss-lint:disable'] || line['scss-line:enable'] }
+    end
+
+    def preprocess_contents # rubocop:disable CyclomaticComplexity
+      return unless @preprocess_command
+      # Never preprocess :code scss if @preprocess_files is specified.
+      return if @preprocess_files && @filename.nil?
+      return if @preprocess_files &&
+                @preprocess_files.none? { |pattern| File.fnmatch(pattern, @filename) }
+      @contents, status = Open3.capture2(@preprocess_command, stdin_data: @contents)
+      raise SCSSLint::Exceptions::PreprocessorError if status != 0
     end
   end
 end