Handle "//# sourceURL" comments in the Parser instead of the JS.

src/scanner.cc

Index: src/scanner.cc
diff --git a/src/scanner.cc b/src/scanner.cc
index 0265a8fa7810a797361e202f05dfd5ff045d11d1..e345e8353adc4e5a07db7b2c6c97465383715837 100644
--- a/src/scanner.cc
+++ b/src/scanner.cc
@@ -209,6 +209,7 @@ Token::Value Scanner::Next() {
   current_ = next_;
   has_line_terminator_before_next_ = false;
   has_multiline_comment_before_next_ = false;
+  has_source_map_comment_ = false;
   if (static_cast<unsigned>(c0_) <= 0x7f) {
     Token::Value token = static_cast<Token::Value>(one_char_tokens[c0_]);
     if (token != Token::ILLEGAL) {
@@ -294,6 +295,18 @@ Token::Value Scanner::SkipSingleLineComment() {
 }
 
 
+Token::Value Scanner::SkipSourceMapComment() {
+  Advance();
+  source_map_comment_.Reset();
+  while (c0_ >= 0 && !unicode_cache_->IsLineTerminator(c0_)) {
+    source_map_comment_.AddChar(c0_);
+    Advance();
+  }
+  has_source_map_comment_ = true;
+  return Token::WHITESPACE;
+}
+
+
 Token::Value Scanner::SkipMultiLineComment() {
   ASSERT(c0_ == '*');
   Advance();
@@ -458,7 +471,14 @@ void Scanner::Scan() {
         // /  // /* /=
         Advance();
         if (c0_ == '/') {
-          token = SkipSingleLineComment();
+          Advance();
+          if (c0_ == '@' || c0_ == '#') {
+            Advance();
+            token = SkipSourceMapComment();
+          } else {
+            PushBack(c0_);
+            token = SkipSingleLineComment();
+          }
         } else if (c0_ == '*') {
           token = SkipMultiLineComment();
         } else if (c0_ == '=') {
@@ -1093,6 +1113,17 @@ bool Scanner::ScanRegExpFlags() {
 }
 
 
+Handle<String> Scanner::AllocateInternalizedSourceMapComment(Isolate* isolate) {
+  if (source_map_comment_.is_one_byte()) {
+    return isolate->factory()->InternalizeOneByteString(
+        source_map_comment_.one_byte_literal());
+  } else {
+    return isolate->factory()->InternalizeTwoByteString(
+        source_map_comment_.two_byte_literal());
+  }
+}
+
+
 Handle<String> Scanner::AllocateNextLiteralString(Isolate* isolate,
                                                   PretenureFlag tenured) {
   if (is_next_literal_one_byte()) {