Implement ES6 Template Literals

src/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // For CachedDataMode
@@ skipping 575 matching lines @@
       FunctionLiteral::ArityRestriction arity_restriction, bool* ok);
   V8_INLINE void SkipLazyFunctionBody(const AstRawString* name,
                                       int* materialized_literal_count,
                                       int* expected_property_count, bool* ok);
   V8_INLINE ZoneList<Statement*>* ParseEagerFunctionBody(
       const AstRawString* name, int pos, Variable* fvar,
       Token::Value fvar_init_op, bool is_generator, bool* ok);
   V8_INLINE void CheckConflictingVarDeclarations(v8::internal::Scope* scope,
                                                  bool* ok);
 
+  class TemplateLiteral : public ZoneObject {
+   public:
+    TemplateLiteral(Zone* zone, int pos)
+        : cooked_(8, zone),
+          lengths_(8, zone),
+          expressions_(8, zone),
+          pos_(pos) {}
+
+    const ZoneList<Expression*>* cooked() const { return &cooked_; }
+    const ZoneList<int>* lengths() const { return &lengths_; }
+    const ZoneList<Expression*>* expressions() const { return &expressions_; }
+    int position() const { return pos_; }
+
+    void AddTemplateSpan(Literal* cooked, int end, Zone* zone) {
+      DCHECK_NOT_NULL(cooked);
+      cooked_.Add(cooked, zone);
+      lengths_.Add(end - cooked->position(), zone);
+    }
+
+    void AddExpression(Expression* expression, Zone* zone) {
+      DCHECK_NOT_NULL(expression);
+      expressions_.Add(expression, zone);
+    }
+
+   private:
+    ZoneList<Expression*> cooked_;
+    ZoneList<int> lengths_;
+    ZoneList<Expression*> expressions_;
+    int pos_;
+  };
+
+  typedef TemplateLiteral* TemplateLiteralState;
+
+  V8_INLINE TemplateLiteralState OpenTemplateLiteral(int pos);
+  V8_INLINE void AddTemplateSpan(TemplateLiteralState* state, bool tail);
+  V8_INLINE void AddTemplateExpression(TemplateLiteralState* state,
+                                       Expression* expression);
+  V8_INLINE Expression* CloseTemplateLiteral(TemplateLiteralState* state,
+                                             int start, Expression* tag);
+  V8_INLINE Expression* NoTemplateTag() { return NULL; }
+
  private:
   Parser* parser_;
 };
 
 
 class Parser : public ParserBase<ParserTraits> {
  public:
   // Note that the hash seed in ParseInfo must be the hash seed from the
   // Isolate's heap, otherwise the heap will be in an inconsistent state once
   // the strings created by the Parser are internalized.
@@ skipping 214 matching lines @@
 
   // Consumes the ending }.
   ZoneList<Statement*>* ParseEagerFunctionBody(
       const AstRawString* function_name, int pos, Variable* fvar,
       Token::Value fvar_init_op, bool is_generator, bool* ok);
 
   void HandleSourceURLComments();
 
   void ThrowPendingError();
 
+  TemplateLiteralState OpenTemplateLiteral(int pos);
+  void AddTemplateSpan(TemplateLiteralState* state, bool tail);
+  void AddTemplateExpression(TemplateLiteralState* state,
+                             Expression* expression);
+  Expression* CloseTemplateLiteral(TemplateLiteralState* state,
+                                   int start, Expression* tag);
   Scanner scanner_;
   PreParser* reusable_preparser_;
   Scope* original_scope_;  // for ES5 function declarations in sloppy eval
   Target* target_stack_;  // for break, continue statements
   ParseData* cached_parse_data_;
 
   CompilationInfo* info_;
 
   // Pending errors.
   bool has_pending_error_;
@@ skipping 79 matching lines @@
   // Get the elements array of a compile time value returned by GetValue().
   static Handle<FixedArray> GetElements(Handle<FixedArray> value);
 
  private:
   static const int kLiteralTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
+ParserTraits::TemplateLiteralState ParserTraits::OpenTemplateLiteral(int pos) {

[arv (Not doing code reviews), 2014/11/11 17:15:15]

nit: 2 empty lines between functions

+  return parser_->OpenTemplateLiteral(pos);
+}
+
+void ParserTraits::AddTemplateSpan(TemplateLiteralState* state, bool tail) {
+  parser_->AddTemplateSpan(state, tail);
+}
+void ParserTraits::AddTemplateExpression(TemplateLiteralState* state,
+                                         Expression* expression) {
+  parser_->AddTemplateExpression(state, expression);
+}
+Expression* ParserTraits::CloseTemplateLiteral(TemplateLiteralState* state,
+                                               int start, Expression* tag) {
+  return parser_->CloseTemplateLiteral(state, start, tag);
+}
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_