📄 compiler.java
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import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Compiler extends Frame implements ActionListener{
int row = 1;//数排列,横坐标
int line = 1;//横排行，竖坐标。当遇到回车换行的时候，line++,row = 0;
MenuBar mb = new MenuBar();
Menu fileMenu = new Menu("File");
Menu actionMenu = new Menu("Project");
MenuItem closeWindow = new MenuItem("Exit");
MenuItem openFile = new MenuItem("Open file");
MenuItem lexical_check = new MenuItem("Check lex");
int begin = 0;//当读到第一个字母的时候，标志其位置
int end = 0;
TextArea text = new TextArea(100,30);
TextArea error_text = new TextArea(100,30);
//FileDialog file_dialog_load;
FileDialog file_dialog_load = new FileDialog(this, "Open file...", FileDialog.LOAD);
Compiler(){
//file_dialog_load.setVisible(true);
this.setLayout(new FlowLayout());
this.setMenuBar(mb);
mb.add(fileMenu);
mb.add(actionMenu);
fileMenu.add(openFile);
fileMenu.add(closeWindow);
actionMenu.add(lexical_check);
this.add(text);
this.add(error_text);
error_text.setText("Lexical Information: \n");
closeWindow.addActionListener(this);
openFile.addActionListener(this);
lexical_check.addActionListener(this);
this.setSize(500, 600);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
this.setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Compiler compiler = new Compiler();
}
public void actionPerformed(ActionEvent e){
if(e.getSource() == closeWindow){
System.exit(0);
}else if(e.getSource() == openFile){
file_dialog_load.setVisible(true);
File myfile = new File(file_dialog_load.getDirectory(), file_dialog_load.getFile());
try{
BufferedReader bufReader = new BufferedReader(new FileReader(myfile));
String content = "";
String str;
while((str = bufReader.readLine()) != null){
content += str + "\n";
text.setText(content);
}
}catch(IOException ie){
System.out.println("IOexception occurs...");
}
}else if(e.getSource() == lexical_check){
//error_text.setText("Lexical Information: \n");
error_text.setText("");
row = 0;
line = 1;
checkLexical();
}
}
/*
* 对Text区域数据区进行词法检测
* */
public void checkLexical(){
String error_info = error_text.getText();
String content = text.getText();
if(content.equals("")){
error_info += "Text is empty! You havn't input any code!\n";
error_text.setText(error_info);
}
else{
int i = 0;//选择第i个字符进行检测。
int N = content.length();
//error_text.appendText("N = " + N + '\n');
int state = 0;//状态标志
for(i = 0; i < N; i++){//对所有字符进行检测
row++;
char c = content.charAt(i);
//error_text.appendText("" + c);
//System.out.print(content);
switch(state){
case 0:
//row++;
if(c == ','||c == '\t' || c == '{' || c =='}' || c == '(' || c == ')' || c == ';' || c == '[' || c == ']') {
if(isDigit(content.charAt(i - 1)) && isDigit(content.charAt(begin))){
end = i;
error_text.append("info: 数值表达式 " + content.substring(begin, end) + '\n');
}
error_text.appendText("info: 分隔符 " + c + '\n');
state = 0;
}
else if(c == '+') state = 1;
else if(c == '-') state = 2;
else if(c == '*') state = 3;
else if(c == '/') state = 4;
else if(c == '!') state = 5;
else if(c == '>') state = 6;
else if(c == '<') state = 7;
else if(c == '=') state = 8;
else if(((int)c) == 10) state = 9;//输入为回车
//else if(c == '\n') state = 9;//输入为回车
else if(isLetter(c)) {
state = 10;
begin = i;
}
else if(isDigit(c)) {
begin = i;
state = 11;
}
else if(c == '#') state = 12;
else if(c == '&') state = 14;
else if(c == '|') state = 15;
else if(c == '"') state = 16;
//else error_text.appendText("line: " + line + " row: " + row + " error: '" + c + "' Undefined character! \n");
else state = 9;//输入为回车
break;
case 1://标志符是 +
//row++;
if(c == '+'){
state = 0;
error_text.appendText("info: 运算符 '++'\n");
}
else if(c == '='){
state = 0;
error_text.appendText("info: 运算符 '+='\n");
}else{
state = 0;
error_text.appendText("info: 运算符 '+'\n");
i--;
row--;
}
break;
case 2://标志符是 -
if(c == '-')
error_text.appendText("info: 运算符 '--'\n");
else if(c == '=')
error_text.appendText("info: 运算符 '-='\n");
else{
error_text.appendText("info: 运算符 '-'\n");
i--;
row--;
}
state = 0;
break;
case 3://标志符是 *
if(c == '=')
error_text.appendText("info: 运算符 '*='\n");
else{
error_text.appendText("info: 运算符 '*'\n");
i--;
row--;
}
state = 0;
break;
case 4://标志符是 /
if(c == '/'){
while((c) != '\n'){
c = content.charAt(i);
i++;
}
state = 0;
error_text.appendText("info: 注释部分 // \n");
}else if(c == '='){
state = 0;
error_text.appendText("info: 运算符 /= \n");
}else{
state = 0;
error_text.appendText("info: 运算符 / \n");
i--;
row--;
}
//state = 0;
break;
case 5://标志符是 !
if(c == '='){
error_text.appendText("info: 运算符 != \n");
state = 0;
}else{
state = 0;
i--;
row--;
error_text.appendText("info: 运算符 ! \n");
}
//state = 0;
break;
case 6://标志符是 >
if(c == '='){
error_text.appendText("info: 运算符 >= \n");
state = 0;
}else{
state = 0;
error_text.appendText("info: 元算符 > \n");
}
//state = 0;
break;
case 7://标志符是 <
if(c == '='){
error_text.appendText("info: 运算符 <= \n");
state = 0;
}else{
state = 0;
error_text.appendText("info: 运算符 < \n");
}
break;
case 8://标志符是 =
if(c == '='){
error_text.appendText("info: 运算符 == \n");
state = 0;
}else{
state = 0;
error_text.appendText("info: 运算符 = \n");
}
break;
case 9://标志符是 回车
state = 0;
row = 1;
line ++;
break;
case 10://标志符是 字母
if(isLetter(c) || isDigit(c)){
state = 10;
}else{
end = i;
String id = content.substring(begin, end);
if(isKey(id))
error_text.appendText("info: 关键字 " + id + '\n');
else
error_text.appendText("info: 标志符 " + id + '\n');
i--;
row--;
state = 0;
}
//state = 0;
break;
case 11://标志符是 数字
if(c == 'e' || c == 'E')
state = 13;
else if(isDigit(c) || c == '.'){
//省略跳过，i加一操作
}else {
if(isLetter(c)){
error_text.appendText("error: line " + line + " row " + row + " 数字格式错误或者标志符错误\n");
}
//i--;
//row--;
int temp = i;
i = find(i,content);
row += (i - temp);
state = 0;
}
break;
case 12://标志符是 #
String id = "";
while(c != '<'){
id += c;
i++;
c = content.charAt(i);
}
if(id.trim().equals("include")){
while(c != '>' && ( c != '\n')){
i++;
c = content.charAt(i);
}
if(c == '>')
error_text.append("info: 头文件引入文法 \n");
}else
error_text.appendText("error: " + "line " + line + ", row " + row + " 语法错误\n");
//i--;
//row--;
state = 0;
break;
case 13://检测指数表示方式
if(c == '+' || c == '-' || isDigit(c)){
i++;
c = content.charAt(i);
while(isDigit(c)){
i++;
c = content.charAt(i);
}
if(isLetter(c) || c == '.'){
error_text.appendText("error； line " + line + " row " + row + " 指数格式错误！\n");
state = 0;
//i--;
//row--;
int temp = i;
i = find(i,content);
row += (i - temp);
//error_text.appendText("i = " + i + " row = " + row + " len = " + content.length() + '\n');
}else{
end = i;
error_text.appendText("info: 指数 " + content.substring(begin, end) + '\n');
}
/*
end = i;
String str = content.substring(begin, end);
error_text.appendText("info: 指数 " + str + '\n');
*/
state = 0;
}
break;
case 14:// 逻辑运算发 &&
if(c == '&')
error_text.appendText("info: 逻辑AND运算符 '&&' \n");
else{
i--;
error_text.appendText("info: & 不明运算符. \n");
}
state = 0;
break;
case 15:// 逻辑运算发 ||
if(c == '|')
error_text.appendText("info: 逻辑OR运算符 '||' \n");
else{
i--;
error_text.appendText("info: '|' 不明运算符. \n");
}
state = 0;
break;
case 16:
error_text.appendText("info: 引号 " + '"' + '\n');
i--;
state = 0;
break;
}
} error_text.appendText("Have checked lexical! \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("int") || str.equals("real") || str.equals("for") || str.equals("while") || str.equals("do") || str.equals("begin") || str.equals("end") || str.equals("if") || str.equals("then")||
str.equals("AND") || str.equals("OR") || str.equals("NOT") || str.equals("repeat") || str.equals("until") || str.equals("read") || str.equals("write") || str.equals("return") || str.equals("true")
|| str.equals("false") || str.equals("boolean") || str.equals("program") || str.equals("const") || str.equals("to"))
return true;
return false;
}
int find(int begin, String str){//寻找分隔符空格、括号、回车等。
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();
}
}
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