Fix /* formatting to match Ruby Sass

CHANGELOG.md

@@ -5,6 +5,9 @@
 * Don't add an extra `*/` to comments in the indented syntax that already have
   it.
 
+* Improve the formatting of comments that don't start on the same line as the
+  opening `/*`.
+
 ## 1.0.0-beta.5.2
 
 * Fix a bug where some colors would crash `compressed` mode.

lib/src/parse/parser.dart

@@ -48,6 +48,14 @@ abstract class Parser {
     }
   }
 
+  /// Consumes spaces and tabs.
+  @protected
+  void spaces() {
+    while (!scanner.isDone && isSpaceOrTab(scanner.peekChar())) {
+      scanner.readChar();
+    }
+  }
+
   /// Consumes and ignores a comment if possible.
   ///
   /// Returns whether the comment was consumed.

lib/src/parse/sass.dart

@@ -208,7 +208,17 @@ class SassParser extends StylesheetParser {
     var buffer = new InterpolationBuffer()..write("/*");
     var parentIndentation = currentIndentation;
     while (true) {
-      if (!first) {
+      if (first) {
+        // If the first line is empty, ignore it.
+        var beginningOfComment = scanner.position;
+        spaces();
+        if (isNewline(scanner.peekChar())) {
+          _readIndentation();
+          buffer.writeCharCode($space);
+        } else {
+          buffer.write(scanner.substring(beginningOfComment));
+        }
+      } else {
         buffer.writeln();
         buffer.write(" * ");
       }

lib/src/util/character.dart

@@ -12,12 +12,15 @@ const _asciiCaseBit = 0x20;
 
 /// Returns whether [character] is an ASCII whitespace character.
 bool isWhitespace(int character) =>
-    character == $space || character == $tab || isNewline(character);
+    isSpaceOrTab(character) || isNewline(character);
 
 /// Returns whether [character] is an ASCII newline.
 bool isNewline(int character) =>
     character == $lf || character == $cr || character == $ff;
 
+/// Returns whether [character] is a space or a tab character.
+bool isSpaceOrTab(int character) => character == $space || character == $tab;
+
 /// Returns whether [character] is a letter or number.
 bool isAlphanumeric(int character) =>
     isAlphabetic(character) || isDigit(character);