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108 lines
3.6 KiB
108 lines
3.6 KiB
/***************************************************************************
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* Copyright (C) 2004-2005 by Daniel Clarke *
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* daniel.jc@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#ifndef BTREENODE_H
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#define BTREENODE_H
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#include "btreebase.h"
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#include "expression.h"
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#include <tqstring.h>
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#include <tqptrlist.h>
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/**
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A node points to the two child nodes (left and right), and contains the binary
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operation used to combine them.
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@author Daniel Clarke
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@author David Saxton
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*/
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class BTreeNode
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{
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public:
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BTreeNode();
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BTreeNode(BTreeNode *p, BTreeNode *l, BTreeNode *r);
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~BTreeNode();
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/**
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* Used for debugging purposes; prints the tree structure to stdout.
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*/
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// void printTree();
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/**
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* Recursively delete all tqchildren of a node.
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*/
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void deleteChildren();
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/**
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* @return the parent node.
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*/
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BTreeNode *parent() const { return m_parent; }
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/**
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* @return the left child node.
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*/
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BTreeNode *left() const { return m_left; }
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/**
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* @return the right child node.
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*/
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BTreeNode *right() const { return m_right; }
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void setParent(BTreeNode *parent) { m_parent = parent; }
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/**
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* Set the child node on the left to the one give, and reparents it to
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* this node.
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*/
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void setLeft(BTreeNode *left) { m_left = left; m_left->setParent( this ); }
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/**
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* Set the child node on the right to the one give, and reparents it to
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* this node.
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*/
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void setRight(BTreeNode *right) { m_right = right; m_right->setParent( this ); }
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/**
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* @return true if have a left or a right child node.
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*/
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bool hasChildren() const { return m_left || m_right; }
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ExprType type() const {return m_type;}
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void setType(ExprType type) { m_type = type; }
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TQString value() const {return m_value;}
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void setValue( const TQString & value ) { m_value = value; }
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Expression::Operation childOp() const {return m_childOp;}
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void setChildOp(Expression::Operation op){ m_childOp = op;}
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void setReg( const TQString & r ){ m_reg = r; }
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TQString reg() const {return m_reg;}
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bool needsEvaluating() const { return hasChildren(); }
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protected:
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BTreeNode *m_parent;
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BTreeNode *m_left;
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BTreeNode *m_right;
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/** This is used to remember what working register contains the value of the node during assembly.*/
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TQString m_reg;
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ExprType m_type;
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TQString m_value;
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Expression::Operation m_childOp;
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};
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#endif
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