nodes.h

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  class ArgumentsNode : public Node {
  public:
    ArgumentsNode() : list(0) {}
    ArgumentsNode(ArgumentListNode *l) : list(l->list) { l->list = 0; }
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    List evaluateList(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    ArgumentListNode *list;
  };

  class NewExprNode : public Node {
  public:
    NewExprNode(Node *e) : expr(e), args(0L) {}
    NewExprNode(Node *e, ArgumentsNode *a) : expr(e), args(a) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
    ArgumentsNode *args;
  };

  class FunctionCallNode : public Node {
  public:
    FunctionCallNode(Node *e, ArgumentsNode *a) : expr(e), args(a) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
    ArgumentsNode *args;
  };

  class PostfixNode : public Node {
  public:
    PostfixNode(Node *e, Operator o) : expr(e), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
    Operator oper;
  };

  class DeleteNode : public Node {
  public:
    DeleteNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class VoidNode : public Node {
  public:
    VoidNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class TypeOfNode : public Node {
  public:
    TypeOfNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class PrefixNode : public Node {
  public:
    PrefixNode(Operator o, Node *e) : oper(o), expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Operator oper;
    Node *expr;
  };

  class UnaryPlusNode : public Node {
  public:
    UnaryPlusNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual double toNumber(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class NegateNode : public Node {
  public:
    NegateNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual double toNumber(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class BitwiseNotNode : public Node {
  public:
    BitwiseNotNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class LogicalNotNode : public Node {
  public:
    LogicalNotNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual bool toBoolean(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class MultNode : public Node {
  public:
    MultNode(Node *t1, Node *t2, char op) : term1(t1), term2(t2), oper(op) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *term1, *term2;
    char oper;
  };

  class AddNode : public Node {
  public:
    AddNode(Node *t1, Node *t2, char op) : term1(t1), term2(t2), oper(op) {}

    static Node* create(Node *t1, Node *t2, char op);

    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *term1, *term2;
    char oper;
  };

  class AppendStringNode : public Node {
  public:
    AppendStringNode(Node *t, const UString &s) : term(t), str(s) { }
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *term;
    UString str;
  };

  class ShiftNode : public Node {
  public:
    ShiftNode(Node *t1, Operator o, Node *t2)
      : term1(t1), term2(t2), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *term1, *term2;
    Operator oper;
  };

  class RelationalNode : public Node {
  public:
    RelationalNode(Node *e1, Operator o, Node *e2) :
      expr1(e1), expr2(e2), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr1, *expr2;
    Operator oper;
  };

  class EqualNode : public Node {
  public:
    EqualNode(Node *e1, Operator o, Node *e2)
      : expr1(e1), expr2(e2), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr1, *expr2;
    Operator oper;
  };

  class BitOperNode : public Node {
  public:
    BitOperNode(Node *e1, Operator o, Node *e2) :
      expr1(e1), expr2(e2), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr1, *expr2;
    Operator oper;
  };

  /**
   * expr1 && expr2, expr1 || expr2
   */
  class BinaryLogicalNode : public Node {
  public:
    BinaryLogicalNode(Node *e1, Operator o, Node *e2) :
      expr1(e1), expr2(e2), oper(o) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr1, *expr2;
    Operator oper;
  };

  /**
   * The ternary operator, "logical ? expr1 : expr2"
   */
  class ConditionalNode : public Node {
  public:
    ConditionalNode(Node *l, Node *e1, Node *e2) :
      logical(l), expr1(e1), expr2(e2) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *logical, *expr1, *expr2;
  };

  class AssignNode : public Node {
  public:
    AssignNode(Node *l, Operator o, Node *e) : left(l), oper(o), expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *left;
    Operator oper;
    Node *expr;
  };

  class CommaNode : public Node {
  public:
    CommaNode(Node *e1, Node *e2) : expr1(e1), expr2(e2) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr1, *expr2;
  };

  class StatListNode : public StatementNode {
  public:
    // list is circular during construction. cracked in CaseClauseNode ctor
    StatListNode(StatementNode *s);
    StatListNode(StatListNode *l, StatementNode *s);
    virtual void ref();
    virtual bool deref();
    virtual Completion execute(ExecState *exec);
    virtual void processVarDecls(ExecState *exec);
    virtual void streamTo(SourceStream &s) const;
  private:
    friend class CaseClauseNode;
    StatementNode *statement;
    StatListNode *list;
  };

  class AssignExprNode : public Node {
  public:
    AssignExprNode(Node *e) : expr(e) {}
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void streamTo(SourceStream &s) const;
  private:
    Node *expr;
  };

  class VarDeclNode : public Node {
  public:
    enum Type { Variable, Constant };
    VarDeclNode(const Identifier &id, AssignExprNode *in, Type t);
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void processVarDecls(ExecState *exec);
    virtual void streamTo(SourceStream &s) const;
  private:
    Type varType;
    Identifier ident;
    AssignExprNode *init;
  };

  class VarDeclListNode : public Node {
  public:
    // list pointer is tail of a circular list, cracked in the ForNode/VarStatementNode ctor
    VarDeclListNode(VarDeclNode *v) : list(this), var(v) {}
    VarDeclListNode(VarDeclListNode *l, VarDeclNode *v)
      : list(l->list), var(v) { l->list = this; }
    virtual void ref();
    virtual bool deref();
    virtual Value evaluate(ExecState *exec) const;
    virtual void processVarDecls(ExecState *exec);
    virtual void streamTo(SourceStream &s) const;
  private:
    friend class ForNode;
    friend class VarStatementNode;
    VarDeclListNode *list;
    VarDeclNode *var;
  };

  class VarStatementNode : public StatementNode {
  public:
    VarStatementNode(VarDeclListNode *l) : list(l->list) { l->list = 0; }
    virtual void ref();
    virtual bool deref();
    virtual Completion execute(ExecState *exec);
    virtual void processVarDecls(ExecState *exec);
    virtual void streamTo(SourceStream &s) const;
  private:
    VarDeclListNode *list;
  };