Add fine-grained diff implementation to LiveEdit engine.

src/liveedit.h

 // Copyright 2010 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 108 matching lines @@
 
   // A copy of this is in liveedit-debugger.js.
   enum FunctionPatchabilityStatus {
     FUNCTION_AVAILABLE_FOR_PATCH = 1,
     FUNCTION_BLOCKED_ON_ACTIVE_STACK = 2,
     FUNCTION_BLOCKED_ON_OTHER_STACK = 3,
     FUNCTION_BLOCKED_UNDER_NATIVE_CODE = 4,
     FUNCTION_REPLACED_ON_ACTIVE_STACK = 5
   };
 
-  // Compares 2 strings line-by-line and returns diff in form of array of
-  // triplets (pos1, pos1_end, pos2_end) describing list of diff chunks.
-  static Handle<JSArray> CompareStringsLinewise(Handle<String> s1,
-                                                Handle<String> s2);
+  // Compares 2 strings line-by-line, then token-wise and returns diff in form
+  // of array of triplets (pos1, pos1_end, pos2_end) describing list
+  // of diff chunks.
+  static Handle<JSArray> CompareStrings(Handle<String> s1,
+                                        Handle<String> s2);
 };
 
 
 // A general-purpose comparator between 2 arrays.
 class Comparator {
  public:
 
   // Holds 2 arrays of some elements allowing to compare any pair of
   // element from the first array and element from the second array.
   class Input {
@@ skipping 21 matching lines @@
   static void CalculateDifference(Input* input,
                                   Output* result_writer);
 };
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */