syntaxtreenode.h

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/************************************************************
* file: SyntaxTreeNode.h
* date: 2006-04-12
* author: wuzuyang
* describe: none; SyntaxTreeNode
*************************************************************/

#include <stdio.h>
#include "common.h"

class SyntaxTreeNode{
private:
	TokenType type;
	int value;	// identifiers will be given distinguish values.
	SyntaxTreeNode *left, *right, *child3;
	
public:
	SyntaxTreeNode();
	SyntaxTreeNode(TokenType t, int val);
	~SyntaxTreeNode();
	
	void setType(TokenType t);
	void setValue(int val);
	
	TokenType getType();
	int getValue();
	
	void addLeft(TokenType t, int val);
	// add the subtree n to this tree's left
	void addLeft(SyntaxTreeNode *n);
	
	void addRight(TokenType t, int val);
	// add the subtree n to this tree's right
	void addRight(SyntaxTreeNode *n);
	
	void addChild3(TokenType t, int val);
	// add the subtree n to this tree's child3
	void addChild3(SyntaxTreeNode *n);
	
	SyntaxTreeNode* getRootNode();
	
	SyntaxTreeNode* getLeft();
	SyntaxTreeNode* getRight();
	SyntaxTreeNode* getChild3();
	
	friend class SyntaxTree;
};