[regexp] implement case-insensitive unicode regexps.

src/regexp/regexp-parser.h

 // Copyright 2016 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_REGEXP_REGEXP_PARSER_H_
 #define V8_REGEXP_REGEXP_PARSER_H_
 
 #include "src/objects.h"
 #include "src/regexp/regexp-ast.h"
 #include "src/zone.h"
@@ skipping 88 matching lines @@
 // Accumulates RegExp atoms and assertions into lists of terms and alternatives.
 class RegExpBuilder : public ZoneObject {
  public:
   RegExpBuilder(Zone* zone, JSRegExp::Flags flags);
   void AddCharacter(uc16 character);
   void AddUnicodeCharacter(uc32 character);
   // "Adds" an empty expression. Does nothing except consume a
   // following quantifier
   void AddEmpty();
   void AddCharacterClass(RegExpCharacterClass* cc);
+  void AddCharacterClass(uc32 c);
   void AddAtom(RegExpTree* tree);
   void AddTerm(RegExpTree* tree);
   void AddAssertion(RegExpTree* tree);
   void NewAlternative();  // '|'
   void AddQuantifierToAtom(int min, int max,
                            RegExpQuantifier::QuantifierType type);
   RegExpTree* ToRegExp();
 
  private:
   static const uc16 kNoPendingSurrogate = 0;
   void AddLeadSurrogate(uc16 lead_surrogate);
   void AddTrailSurrogate(uc16 trail_surrogate);
   void FlushPendingSurrogate();
   void FlushCharacters();
   void FlushText();
   void FlushTerms();
+  bool NeedsDesugaringForUnicode(ZoneList<CharacterRange>* ranges);
+  bool NeedsDesugaringForIgnoreCase(uc32 c);
   Zone* zone() const { return zone_; }
   bool unicode() const { return (flags_ & JSRegExp::kUnicode) != 0; }
+  bool ignore_case() const { return (flags_ & JSRegExp::kIgnoreCase) != 0; }
 
   Zone* zone_;
   bool pending_empty_;
   JSRegExp::Flags flags_;
   ZoneList<uc16>* characters_;
   uc16 pending_surrogate_;
   BufferedZoneList<RegExpTree, 2> terms_;
   BufferedZoneList<RegExpTree, 2> text_;
   BufferedZoneList<RegExpTree, 2> alternatives_;
 #ifdef DEBUG
@@ skipping 143 matching lines @@
   bool simple_;
   bool contains_anchor_;
   bool is_scanned_for_captures_;
   bool failed_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_REGEXP_PARSER_H_