Two-threaded parser

src/scanner-character-streams.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 289 matching lines @@
 }
 
 
 // ----------------------------------------------------------------------------
 // ExternalTwoByteStringUtf16CharacterStream
 
 ExternalTwoByteStringUtf16CharacterStream::
     ~ExternalTwoByteStringUtf16CharacterStream() { }
 
 
-ExternalTwoByteStringUtf16CharacterStream
-    ::ExternalTwoByteStringUtf16CharacterStream(
-        Handle<ExternalTwoByteString> data,
-        int start_position,
-        int end_position)
-    : Utf16CharacterStream(),
-      source_(data),
-      raw_data_(data->GetTwoByteData(start_position)) {
-  buffer_cursor_ = raw_data_,
+ExternalTwoByteStringUtf16CharacterStream::
+    ExternalTwoByteStringUtf16CharacterStream(const uint16_t* raw_data,
+                                              int start_position,
+                                              int end_position)
+    : Utf16CharacterStream(), raw_data_(raw_data + start_position) {
+  buffer_cursor_ = raw_data_;
   buffer_end_ = raw_data_ + (end_position - start_position);
   pos_ = start_position;
 }
 
+
+// ----------------------------------------------------------------------------
+// ExternalOneByteStringUtf16CharacterStream
+
+ExternalOneByteStringUtf16CharacterStream::
+    ExternalOneByteStringUtf16CharacterStream(const uint8_t* raw_data,
+                                              int start_position,
+                                              int end_position)
+    : raw_data_(raw_data + start_position),
+      length_(end_position) {
+  pos_ = start_position;
+}
+
+
+ExternalOneByteStringUtf16CharacterStream::
+    ~ExternalOneByteStringUtf16CharacterStream() {}
+
+
+unsigned ExternalOneByteStringUtf16CharacterStream::BufferSeekForward(
+    unsigned delta) {
+  unsigned old_pos = pos_;
+  pos_ = Min(pos_ + delta, length_);
+  ReadBlock();
+  return pos_ - old_pos;
+}
+
+
+unsigned ExternalOneByteStringUtf16CharacterStream::FillBuffer(
+    unsigned from_pos, unsigned length) {
+  if (from_pos >= length_) return 0;
+  if (from_pos + length > length_) {
+    length = length_ - from_pos;
+  }
+  CopyChars(buffer_, raw_data_ + from_pos, length);
+  return length;
+}
+
+
 } }  // namespace v8::internal