symtablemode.java

一个C语言子集的编译器

/*
 * @(#)SymTableMode.java	1.0.0  05/13/2007
 *
 * Copyright 2007 Xuxt@buaa, No.34060520 All rights reserved.
 */
package com.king4solomon.homework.compiler.core;

import javax.swing.table.*;

@SuppressWarnings("serial")
public final class SymTableMode extends DefaultTableModel {
	public SymTableMode() {
		super();
	}

	public int getColumnCount() {
		return cNames.length;
	}

	public String getColumnName(int idx) {
		return cNames[idx];
	}

	public void addRow(SymTableItem item) {
		rCount++;
		item.obj[0] = rCount;
		super.addRow(item.obj);
	}

	public void removeRow() {
		super.removeRow(--rCount);
	}

	/**
	 * @param nm
	 *            要查找的元素名称
	 * @param lv
	 *            要查找的元素引用层次
	 * @return 如果在lv层找到 返回ConstSet.FINDINCLV；如果在lv外层找到 返回ConstSet.FINDINOLV
	 *         否则返回ConstSet.NOTFOUND
	 */
	public int search(String nm, int lv) {
		for (int i = getRowCount() - 1; i >= 0; i--) {
			// 跳过函数
			if (getValueAt(i, 2).equals("func"))
				continue;
			// 找到
			if (((String) (getValueAt(i, 1))).equals(nm)) {
				int id = Integer.parseInt(getValueAt(i, 0).toString());
				String tmpLv = getValueAt(i, 5).toString();
				String tmpType = getValueAt(i, 3).toString();
				String tmpKind = getValueAt(i, 2).toString();
				String tmpAdd = getValueAt(i, 6).toString();
				String tmpVal = getValueAt(i, 4).toString();
				int tp;
				if (tmpType.equals("int")) {
					tp = ConstSet.INTEGER;
				} else if (tmpType.equals("char")) {
					tp = ConstSet.CHARACTER;
				} else {
					tp = ConstSet.REAL;
				}

				// 在本层
				if (Integer.parseInt(tmpLv) == lv) {
					lastFoundEle = new ItemInfo(id, tp, tmpAdd, 0, tmpKind, tmpVal);
					return ConstSet.FINDINCLV;
				}

				// 在外层
				else if (Integer.parseInt(tmpLv) < lv) {
					lastFoundEle = new ItemInfo(id, tp, tmpAdd, 1, tmpKind, tmpVal);
					return ConstSet.FINDINOLV;
				}
			}
		}
		// 未找到
		return ConstSet.NOTFOUND;
	}
	

	public int searchFunc(String nm) {
		for (int i = 0; i < getRowCount(); i++) {
			if (!getValueAt(i, 2).equals("func"))
				continue;
			// 找到
			if (((String) (getValueAt(i, 1))).equalsIgnoreCase(nm)) {
				int id = Integer.parseInt(getValueAt(i, 0).toString());
				String tmpPc = getValueAt(i, 5).toString();// 存放参数个数
				String tmpType = getValueAt(i, 3).toString();
				String tmpVal = getValueAt(i, 4).toString();
				int tp;
				if (tmpType.equals("int")) {
					tp = ConstSet.INTEGER;
				} else if (tmpType.equals("char")) {
					tp = ConstSet.CHARACTER;
				} else if(tmpType.equals("float")){
					tp = ConstSet.REAL;
				}else{
					tp = ConstSet.VOIDTYPE;
				}
				String tmpAdd = getValueAt(i, 6).toString();
				lastFoundFunc = new ItemInfo(id, tp, tmpAdd, Integer
						.parseInt(tmpPc), "func", tmpVal);
				// 无返回值函数
				if (((String) getValueAt(i, 3)).equals("void")) {
					return ConstSet.NRFRETURN;
				}
				// 带返回值函数
				else {
					return ConstSet.RFRETURN;
				}
			}
		}
		// 未找到
		lastFoundEle = null;
		return ConstSet.NOTFOUND;
	}

	public void quit() {
		for (int i = getRowCount() - 1; i >= 0; i--) {
			if (((String) this.getValueAt(i, 2)).equals("func")) {
				int paraCount = Integer.parseInt(getValueAt(i, 5).toString());
				for (int j = i + 1; j <= i + paraCount; j++)
					setValueAt("", j, 1);
				int tmp = getRowCount();
				for (int j = i + paraCount + 1; j < tmp; j++)
					removeRow();
				return;
			}
		}
	}

	// 取得最后一次查询的元素信息
	public ItemInfo getEleInfo() {

		return lastFoundEle;
	}

	public ItemInfo getFuncInfo() {

		return lastFoundFunc;
	}

	public int levBreak(int lv) {
		return 0;
	}

	public int getRCount() {
		return rCount;
	}

	public void setRCount(int r) {
		rCount = r;
	}

	private int rCount = 0;

	private ItemInfo lastFoundEle;

	private ItemInfo lastFoundFunc;

	private String[] cNames = { "ID", "Name", "kind", "Type", "Value", "Level",
			"Adress" };

}