* Added min/max match length to irregexp ast

src/ast.h

 // Copyright 2006-2008 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 1195 matching lines @@
   virtual void Accept(AstVisitor* v);
 };
 
 
 // ----------------------------------------------------------------------------
 // Regular expressions
 
 
 class RegExpTree: public ZoneObject {
  public:
+  static const int kInfinity = (1<<31)-1;
   virtual ~RegExpTree() { }
   virtual void* Accept(RegExpVisitor* visitor, void* data) = 0;
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success) = 0;
   virtual bool IsTextElement() { return false; }
+  virtual int min_match() = 0;
+  virtual int max_match() = 0;
   virtual void AppendToText(RegExpText* text);
   SmartPointer<const char> ToString();
 #define MAKE_ASTYPE(Name)                                                  \
   virtual RegExp##Name* As##Name();                                        \
   virtual bool Is##Name();
   FOR_EACH_REG_EXP_TREE_TYPE(MAKE_ASTYPE)
 #undef MAKE_ASTYPE
 };
 
 
 class RegExpDisjunction: public RegExpTree {
  public:
-  explicit RegExpDisjunction(ZoneList<RegExpTree*>* alternatives)
-      : alternatives_(alternatives) { }
+  explicit RegExpDisjunction(ZoneList<RegExpTree*>* alternatives);
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpDisjunction* AsDisjunction();
   virtual bool IsDisjunction();
+  virtual int min_match() { return min_match_; }
+  virtual int max_match() { return max_match_; }
   ZoneList<RegExpTree*>* alternatives() { return alternatives_; }
  private:
   ZoneList<RegExpTree*>* alternatives_;
+  int min_match_;
+  int max_match_;
 };
 
 
 class RegExpAlternative: public RegExpTree {
  public:
-  explicit RegExpAlternative(ZoneList<RegExpTree*>* nodes) : nodes_(nodes) { }
+  explicit RegExpAlternative(ZoneList<RegExpTree*>* nodes);
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpAlternative* AsAlternative();
   virtual bool IsAlternative();
+  virtual int min_match() { return min_match_; }
+  virtual int max_match() { return max_match_; }
   ZoneList<RegExpTree*>* nodes() { return nodes_; }
  private:
   ZoneList<RegExpTree*>* nodes_;
+  int min_match_;
+  int max_match_;
 };
 
 
-class RegExpText: public RegExpTree {
- public:
-  RegExpText() : elements_(2) { }
-  virtual void* Accept(RegExpVisitor* visitor, void* data);
-  virtual RegExpNode* ToNode(RegExpCompiler* compiler,
-                             RegExpNode* on_success);
-  virtual RegExpText* AsText();
-  virtual bool IsText();
-  virtual bool IsTextElement() { return true; }
-  virtual void AppendToText(RegExpText* text);
-  void AddElement(TextElement elm) { elements_.Add(elm); }
-  ZoneList<TextElement>* elements() { return &elements_; }
- private:
-  ZoneList<TextElement> elements_;
-};
-
-
 class RegExpAssertion: public RegExpTree {
  public:
   enum Type {
     START_OF_LINE,
     START_OF_INPUT,
     END_OF_LINE,
     END_OF_INPUT,
     BOUNDARY,
     NON_BOUNDARY
   };
   explicit RegExpAssertion(Type type) : type_(type) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpAssertion* AsAssertion();
   virtual bool IsAssertion();
+  virtual int min_match() { return 0; }
+  virtual int max_match() { return 0; }
   Type type() { return type_; }
  private:
   Type type_;
 };
 
 
 class RegExpCharacterClass: public RegExpTree {
  public:
   RegExpCharacterClass(ZoneList<CharacterRange>* ranges, bool is_negated)
       : ranges_(ranges),
         is_negated_(is_negated) { }
   explicit RegExpCharacterClass(uc16 type)
       : ranges_(new ZoneList<CharacterRange>(2)),
         is_negated_(false) {
     CharacterRange::AddClassEscape(type, ranges_);
   }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpCharacterClass* AsCharacterClass();
   virtual bool IsCharacterClass();
   virtual bool IsTextElement() { return true; }
+  virtual int min_match() { return 1; }
+  virtual int max_match() { return 1; }
   virtual void AppendToText(RegExpText* text);
   ZoneList<CharacterRange>* ranges() { return ranges_; }
   bool is_negated() { return is_negated_; }
  private:
   ZoneList<CharacterRange>* ranges_;
   bool is_negated_;
 };
 
 
 class RegExpAtom: public RegExpTree {
  public:
   explicit RegExpAtom(Vector<const uc16> data) : data_(data) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpAtom* AsAtom();
   virtual bool IsAtom();
   virtual bool IsTextElement() { return true; }
+  virtual int min_match() { return data_.length(); }
+  virtual int max_match() { return data_.length(); }
   virtual void AppendToText(RegExpText* text);
   Vector<const uc16> data() { return data_; }
+  int length() { return data_.length(); }
  private:
   Vector<const uc16> data_;
 };
 
 
+class RegExpText: public RegExpTree {
+ public:
+  RegExpText() : elements_(2), length_(0) {}
+  virtual void* Accept(RegExpVisitor* visitor, void* data);
+  virtual RegExpNode* ToNode(RegExpCompiler* compiler,
+                             RegExpNode* on_success);
+  virtual RegExpText* AsText();
+  virtual bool IsText();
+  virtual bool IsTextElement() { return true; }
+  virtual int min_match() { return length_; }
+  virtual int max_match() { return length_; }
+  virtual void AppendToText(RegExpText* text);
+  void AddElement(TextElement elm)  {
+    elements_.Add(elm);
+    length_ += elm.length();
+  };
+  ZoneList<TextElement>* elements() { return &elements_; }
+ private:
+  ZoneList<TextElement> elements_;
+  int length_;
+};
+
+
 class RegExpQuantifier: public RegExpTree {
  public:
   RegExpQuantifier(int min, int max, bool is_greedy, RegExpTree* body)
       : min_(min),
         max_(max),
         is_greedy_(is_greedy),
-        body_(body) { }
+        body_(body),
+        min_match_(min * body->min_match()) {
+    if (max > 0 && body->max_match() > kInfinity / max) {
+      max_match_ = kInfinity;
+    } else {
+      max_match_ = max * body->max_match();
+    }
+  }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   static RegExpNode* ToNode(int min,
                             int max,
                             bool is_greedy,
                             RegExpTree* body,
                             RegExpCompiler* compiler,
                             RegExpNode* on_success);
   virtual RegExpQuantifier* AsQuantifier();
   virtual bool IsQuantifier();
+  virtual int min_match() { return min_match_; }
+  virtual int max_match() { return max_match_; }
   int min() { return min_; }
   int max() { return max_; }
   bool is_greedy() { return is_greedy_; }
   RegExpTree* body() { return body_; }
-  // We just use a very large integer value as infinity because 2^30
-  // is infinite in practice.
-  static const int kInfinity = (1 << 30);
  private:
   int min_;
   int max_;
   bool is_greedy_;
   RegExpTree* body_;
+  int min_match_;
+  int max_match_;
 };
 
 
 enum CaptureAvailability {
   CAPTURE_AVAILABLE,
   CAPTURE_UNREACHABLE,
   CAPTURE_PERMANENTLY_UNREACHABLE
 };
 
 class RegExpCapture: public RegExpTree {
  public:
   explicit RegExpCapture(RegExpTree* body, int index)
       : body_(body), index_(index), available_(CAPTURE_AVAILABLE) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   static RegExpNode* ToNode(RegExpTree* body,
                             int index,
                             RegExpCompiler* compiler,
                             RegExpNode* on_success);
   virtual RegExpCapture* AsCapture();
   virtual bool IsCapture();
+  virtual int min_match() { return body_->min_match(); }
+  virtual int max_match() { return body_->max_match(); }
   RegExpTree* body() { return body_; }
   int index() { return index_; }
   inline CaptureAvailability available() { return available_; }
   inline void set_available(CaptureAvailability availability) {
     available_ = availability;
   }
   static int StartRegister(int index) { return index * 2; }
   static int EndRegister(int index) { return index * 2 + 1; }
  private:
   RegExpTree* body_;
   int index_;
   CaptureAvailability available_;
 };
 
 
 class RegExpLookahead: public RegExpTree {
  public:
   RegExpLookahead(RegExpTree* body, bool is_positive)
       : body_(body),
         is_positive_(is_positive) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpLookahead* AsLookahead();
   virtual bool IsLookahead();
+  virtual int min_match() { return 0; }
+  virtual int max_match() { return 0; }
   RegExpTree* body() { return body_; }
   bool is_positive() { return is_positive_; }
  private:
   RegExpTree* body_;
   bool is_positive_;
 };
 
 
 class RegExpBackReference: public RegExpTree {
  public:
   explicit RegExpBackReference(RegExpCapture* capture)
       : capture_(capture) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpBackReference* AsBackReference();
   virtual bool IsBackReference();
+  virtual int min_match() { return capture_->min_match(); }
+  virtual int max_match() { return capture_->max_match(); }
   int index() { return capture_->index(); }
   RegExpCapture* capture() { return capture_; }
  private:
   RegExpCapture* capture_;
 };
 
 
 class RegExpEmpty: public RegExpTree {
  public:
   RegExpEmpty() { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpEmpty* AsEmpty();
   virtual bool IsEmpty();
+  virtual int min_match() { return 0; }
+  virtual int max_match() { return 0; }
   static RegExpEmpty* GetInstance() { return &kInstance; }
  private:
   static RegExpEmpty kInstance;
 };
 
 
 class RegExpVisitor BASE_EMBEDDED {
  public:
   virtual ~RegExpVisitor() { }
 #define MAKE_CASE(Name)                                              \
@@ skipping 41 matching lines @@
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_