[Sass] Allow comments at the beginning of the doc to have arbitrary indentation.

doc-src/SASS_CHANGELOG.md

@@ -21,6 +21,9 @@
 * Fix the `--cache-location` flag, which was previously throwing errors.
   Thanks to [tav](http://tav.espians.com/).
 
+* Allow comments at the beginning of the document to have arbitrary indentation,
+  just like comments elsewhere.
+
 ## [2.2.17](http://github.com/nex3/haml/commit/2.2.16)
 
 * When the {file:SASS_REFERENCE.md#full_exception-option `:full_exception` option}

lib/sass/engine.rb

@@ -182,6 +182,7 @@ module Sass
 
     def tabulate(string)
       tab_str = nil
+      initial_comment_tab_str = nil
       first = true
       lines = []
       string.gsub(/\r|\n|\r\n|\r\n/, "\n").scan(/^.*?$/).each_with_index do |line, index|
@@ -193,6 +194,14 @@ module Sass
 
         line_tab_str = line[/^\s*/]
         unless line_tab_str.empty?
+          initial_comment_tab_str ||= line_tab_str
+          # Support comments at the beginning of the document
+          # using arbitrary indentation
+          if tab_str.nil? && lines.last && lines.last.comment? && line =~ /^(?:#{initial_comment_tab_str})(.*)$/
+            lines.last.text << "\n" << $1
+            next
+          end
+
           tab_str ||= line_tab_str
 
           raise SyntaxError.new("Indenting at the beginning of the document is illegal.", index) if first

test/sass/engine_test.rb

@@ -691,6 +691,22 @@ foo {
 CSS
   end
 
+  def test_comment_indentation_at_beginning_of_doc
+    assert_equal <<CSS, render(<<SASS)
+/* foo
+ * bar
+ *   baz */
+foo {
+  a: b; }
+CSS
+/* foo
+   bar
+     baz
+foo
+  a: b
+SASS
+  end
+
   def test_attribute_selector_with_spaces
     assert_equal(<<CSS, render(<<SASS))
 a b[foo = bar] {