Implement ES6 Template Literals

src/scanner.h

 // Copyright 2011 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.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_SCANNER_H_
 #define V8_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 440 matching lines @@
   }
   void SetHarmonyNumericLiterals(bool numeric_literals) {
     harmony_numeric_literals_ = numeric_literals;
   }
   bool HarmonyClasses() const {
     return harmony_classes_;
   }
   void SetHarmonyClasses(bool classes) {
     harmony_classes_ = classes;
   }
+  bool HarmonyTemplates() const { return harmony_templates_; }
+  void SetHarmonyTemplates(bool templates) { harmony_templates_ = templates; }
 
   // Returns true if there was a line terminator before the peek'ed token,
   // possibly inside a multi-line comment.
   bool HasAnyLineTerminatorBeforeNext() const {
     return has_line_terminator_before_next_ ||
            has_multiline_comment_before_next_;
   }
 
   // Scans the input as a regular expression pattern, previous
   // character(s) must be /(=). Returns true if a pattern is scanned.
   bool ScanRegExpPattern(bool seen_equal);
   // Returns true if regexp flags are scanned (always since flags can
   // be empty).
   bool ScanRegExpFlags();
 
+  // Scans the input as a template literal
+  Token::Value ScanTemplateSpan();
+
   const LiteralBuffer* source_url() const { return &source_url_; }
   const LiteralBuffer* source_mapping_url() const {
     return &source_mapping_url_;
   }
 
   bool IdentifierIsFutureStrictReserved(const AstRawString* string) const;
 
  private:
   // The current and look-ahead token.
   struct TokenDesc {
@@ skipping 188 matching lines @@
   // line-terminator after the current token, and before the next.
   bool has_multiline_comment_before_next_;
   // Whether we scan 'let' as a keyword for harmony block-scoped let bindings.
   bool harmony_scoping_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
   // Whether we scan 0o777 and 0b111 as numbers.
   bool harmony_numeric_literals_;
   // Whether we scan 'class', 'extends', 'static' and 'super' as keywords.
   bool harmony_classes_;
+  // Whether we scan TEMPLATE_SPAN and TEMPLATE_TAIL
+  bool harmony_templates_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_