analyzerframe.java

cmm语言词法分析器的详细源代码和执行程序

			chooser = new JFileChooser("C:\\Program Files");
			int k = chooser.showSaveDialog(frm);
			if (k == chooser.APPROVE_OPTION) {
				try {
					FileWriter fw = new FileWriter(chooser.getSelectedFile()
							.getAbsolutePath());
					fw.write(jTextArea1.getText());
					fw.close();
				} catch (IOException e) {
				}
				jTextArea1.setText(null);
			} else
				jTextArea1.setText(jTextArea1.getText());
		} else if (i == 1)
			jTextArea1.setText(null);
		else
			jTextArea1.setText(jTextArea1.getText());
	}

	// Method to exit
	public void exit() {
		System.exit(0);
	}

	// Method to cut words
	public void cut() {
		try {
			String str = this.jTextArea1.getSelectedText();
			if (str.length() != 0) {
				this.strtext = str;
				this.jTextArea1
						.replaceRange("", this.jTextArea1.getSelectionStart(),
								this.jTextArea1.getSelectionEnd());
				this.dirty = true;
			}
		} catch (Exception ex) {

		}
	}

	// Method to copy words
	public void copy() {

		try {
			String str = this.jTextArea1.getSelectedText();
			if (str.length() != 0) {
				this.strtext = str;
			}
		} catch (Exception ex) {

		}
	}

	// Method to paste words
	public void paste() {
		if (this.strtext.length() > 0) {
			this.jTextArea1.insert(this.strtext, this.jTextArea1
					.getCaretPosition());
			this.dirty = true;
		}
	}

	// Method to cancel
	public void cancel() {
		undo.undo();
	}

	// Method to run
	public void run() {
		StringReader content = new StringReader(jTextArea1.getText());
		StringBuffer bf = new StringBuffer(); // Store words or number
		br = new BufferedReader(content);
		String strTemp = ""; // Read each row
		String save = "";
		
		if(jTextArea1.getText().equals("")){
			jTextArea2.setText("请输入CMM源程序！ \n");
		}
		else{
		while (strTemp != null) {
			try {
				strTemp = br.readLine();
				save = strTemp;
				if (strTemp != null && !strTemp.equals("")) {
					outStr1 += line + "： " + strTemp + "\n";
					jTextArea2.append(outStr1);
					outStr1 = ""; // Clear the temp

					int row = 0;
					int i = 0;
					int N = strTemp.length();
					int state = 0;
					int begin = 0;
					int end = 0;
					for (i = 0; i < N; i++) {
						row++;
						char ch = strTemp.charAt(i);
						switch (state) {
						case 0:
							if (ch == '(' || ch == ')' || ch == ';'
									|| ch == '{' || ch == '}' || ch == '['
									|| ch == ']') {
								// if(isDigit(ch) &&
								// isDigit(strTemp.charAt(end))){
								// end = i;
								// jTextArea2.append(" info: 数字1 " +
								// strTemp.substring(begin, end) + '\n');
								// }
								jTextArea2.append("   info: 分隔符 " + ch + '\n');
								state = 0;
							} else if (ch == '+')
								state = 1;
							else if (ch == '-')
								state = 2;
							else if (ch == '*')
								state = 3;
							else if (ch == '/')
								state = 4;
							else if (ch == '=')
								state = 5;
							else if (ch == '<')
								state = 6;

							else if (isLetter(ch)) {
								state = 7;
								begin = i;
							} else if (isDigit(ch)) {
								begin = i;
								state = 8;
							}

							break;
						case 1: // For +
							jTextArea2.append("   info: 运算符 +" + "\n");
							i--;
							row--;
							state = 0;
							break;
						case 2: // For -
							jTextArea2.append("   info: 运算符 - \n");
							i--;
							row--;
							state = 0;
							break;
						case 3: // For *
							if (ch == '/') {
								state = 0;
								jTextArea2.append("   info: 注释 */ \n");
							} else {
								jTextArea2.append("   info: 运算符 * \n");
								i--;
								row--;
								state = 0;
							}
							break;
						case 4: // For /
							if (ch == '*') {
								state = 0;
								jTextArea2.append("   info: 注释 /* \n");
							} else {
								jTextArea2.append("   info: 运算符 / \n");
								i--;
								row--;
								state = 0;
							}
							break;
						case 5: // For =
							if (ch == '=') {
								jTextArea2.append("   info: 运算符 == \n");
								state = 0;
							} else {
								state = 0;
								jTextArea2.append("   info: 运算符 = \n");
							}
							break;
						case 6: // For <
							if (ch == '>') {
								jTextArea2.append("   info: 运算符 <> \n");
								state = 0;
							} else {
								state = 0;
								jTextArea2.append("   info: 运算符 < \n");
							}
							break;
						case 7: // For letters
							if (isLetter(ch) || isDigit(ch)) {
								state = 7;
							} else {
								end = i;
								String id = strTemp.substring(begin, end);
								if (isKey(id))
									jTextArea2.append("   info: 关键字 " + id
											+ '\n');
								else
									jTextArea2.append("   info: 标志符 " + id
											+ '\n');
								i--;
								row--;
								state = 0;
							}
							break;
						case 8:// For digit
							if (isDigit(ch)) {
								state = 8;
							} else {
								if (isLetter(ch)) {
									jTextArea2.append("   error: line " + line
											+ " row " + row + " "
											+ "数字格式错误或者标志符错误\n");
								}else{
									end = i;
									String id = strTemp.substring(begin, end);
									jTextArea2.append("   info: 数字 " + id
											+ '\n');
								}
								int temp = i;
								i = find(i, strTemp);
								row += (i - temp);
								state = 0;
							}
							break;
						}
					}
				}
				line++;
			} catch (IOException e) {
			}
		}
		// Clear the temp
		outStr2 = "";
		line = 1; // Redo
		jTextArea2.append("词法分析完成！ \n");
		}
	}

	boolean isLetter(char c) {
		if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_')
			return true;
		return false;
	}

	boolean isDigit(char c) {
		if (c >= '0' && c <= '9')
			return true;
		return false;
	}

	boolean isKey(String str) {
		if (str.equals("if") || str.equals("else") || str.equals("while")
				|| str.equals("read") || str.equals("write")
				|| str.equals("int") || str.equals("real"))
			return true;
		return false;
	}

	int find(int begin, String str) {// find the ' ' ,enter,{},[],()...
		if (begin >= str.length())
			return str.length();
		for (int i = begin; i < str.length(); i++) {
			char c = str.charAt(i);
			if (c == '\n' || c == ',' || c == ' ' || c == '\t' || c == '{'
					|| c == '}' || c == '(' || c == ')' || c == ';' || c == '='
					|| c == '+' || c == '-' || c == '*' || c == '/')
				return i - 1;
		}
		return str.length();
	}

	// Handle About menu action events
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == help_action) {
			JOptionPane.showMessageDialog(this, "这是一个很简单的词法分析器，      \n"
					+ "您只需要输入CMM源程序 ，再点击运行即可", "帮助",
					JOptionPane.INFORMATION_MESSAGE);
		} else if (e.getSource() == about_action) {
			JOptionPane.showMessageDialog(this,
					"|　程序作者: 武汉大学国际软件学院软件工程专业05级　寇文波　\n"
							+ "|　课　　程:《编译原理与实践》　　　　　　　　            \n"
							+ "|　设计时间: 2007年10月　　　　　　　　　　　　         　\n"
							+ "|　邮箱地址: [e-mail]　　　　　　　　　 　     \n"
							+ "|　欢迎大家与我交流，让我们一起共同提高!^_^　　　 　      \n",
					"关于词法分析器", JOptionPane.INFORMATION_MESSAGE);
		}
	}

	// Create UndoHandler Implements the interface :UndoableListener
	class UndoHandler implements UndoableEditListener {
		public void undoableEditHappened(UndoableEditEvent uee) {
			undo.addEdit(uee.getEdit());
		}
	}

	// File actions
	private FileAction new_action, open_action, save_action, close_action,
			cut_action, copy_action, paste_action, cancel_action, run_action,
			font_action;

	private JMenuItem about_action, help_action;

	private JFileChooser chooser = new JFileChooser();

	private JFrame frm = new JFrame();

	private JMenuBar menuBar = new JMenuBar();

	private JToolBar toolBar = new JToolBar();

	private JPopupMenu popupMenu = new JPopupMenu();

	private JPanel jPanel1 = new JPanel();

	private JPanel jPanel2 = new JPanel();

	private JScrollPane jScrollPane1 = new JScrollPane();

	private JScrollPane jScrollPane2 = new JScrollPane();

	protected JTextArea jTextArea1 = new JTextArea();

	protected JTextArea jTextArea2 = new JTextArea();

	private UndoManager undo = new UndoManager();

	private UndoableEditListener undoHandler = new UndoHandler();

	boolean dirty = true;

	String strtext = "";

	static BufferedReader br = null;

	int line = 1;

	String outStr = "";

	String outStr1 = "";

	String outStr2 = "";
}