java模拟编译器实现词法语法分析生成语法树

java模拟编译器,实现词法,语法分析,生成语法树

package analyzer;

/**
 * Created by myz on 2016/6/29.
 */

import javax.swing.*;
import java.util.ArrayList;

public class LexAnalysis {

    private JTextArea errorArea;

    public ArrayList tokenlist=new ArrayList<>（）;
    String[] sss;

    public LexAnalysis（JTextArea jTextArea）{
        this.errorArea=jTextArea;
    }

    public  ArrayList lexical_analysis（String input） {
        String s = input;
        char[] a = s.toCharArray（）;//char数组


        int Lnumber = 0;//左括号的数目
        int Rnumber = 0;//右括号的数目
        int Istrue = 0;//是否错误 0为没有错误 1为有错误

        int[] b = new int[a.length];//整数型
        for （int ii = 0; ii < a.length; ii++） {
            b[ii] = （int） a[ii];
        }

        for （int i = 0; i < a.length; i++） {


            if （i == 0） {
                if （b[i] > 47 && b[i] < 58）
                {
                    //Llist.set（0“s“）;
                    //Llist.remove（1）;
                    //a[i] = ‘s‘;
                }
                if （b[i] < 48 || b[i] > 57） {
                    if （b[i] != 40 && b[i] != 41 && b[i] != 42 && b[i] != 43 && b[i] != 45 && b[i] != 47） {
                        System.out.println（“不能识别的运算符！“）;
                        errorArea.append（“error:不能识别的运算符！\n“）;
                        Istrue = 1;
                        break;
                    }
                    if （b[i] != 40） {
                        System.out.println（“运算式首位不能是运算符！“）;
                        errorArea.append（“error:运算式首位不能是运算符！\n“）;
                        Istrue = 1;
                        break;
                    }
                }
                if （b[i] == 40） {
                    //b[i]==40是左括号
                    Lnumber++;
                    //System.out.println（“bixie“）;
                    int ssss = 0;//判断是否有右括号
                    if （b[i + 1] == 41） {
                        System.out.println（“左右括号之间不能为空！“）;
                        errorArea.append（“error:左右括号之间不能为空！\n“）;
                        Istrue = 1;
                        break;
                    }
                    if （b[i + 1] == 43 || b[i + 1] == 45 || b[i + 1] == 42 || b[i + 1] == 47） {
                        System.out.println（“左括号右侧不能是运算符！“）;
                        errorArea.append（“error:左括号右侧不能是运算符！\n“）;
                        Istrue = 1;
                        break;
                    }
                    for （int j = i; j < a.length; j++） {
                        //b[j]=（int）a[j];
                        if （b[j] == 41） {
                            ssss = 1;
                            //break;
                        }
                    }
                    if （ssss == 0） {
                        System.out.println（“左括号不能找到与之匹配的右括号！“）;
                        errorArea.append（“error:左括号不能找到与之匹配的右括号！\n“）;
                        Istrue = 1;
                        break;
                    }

                }
            }//首位
            else if （i+1 == a.length ）
            {
                if

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      11367  2016-06-29 20:17  src\analyzer\LexAnalysis.java

     文件      10206  2016-06-29 20:12  src\analyzer\SLRParsing.java

     文件       2840  2016-06-29 19:26  src\analyzer\Wordsplit.java

     文件         89  2016-06-29 19:49  src\bean\Grammar.java

     文件       7664  2016-06-29 20:22  src\client\compilerCilent.java

     文件       3204  2016-06-29 20:22  src\client\compilerCilent.jfd

     文件       2088  2016-06-29 20:19  src\client\paintTree.java

     文件        192  2016-06-29 14:52  src\tree\Nodes.java

     文件       1693  2016-06-29 14:52  src\tree\TernaryTree.java

     目录          0  2016-06-29 20:17  src\analyzer

     目录          0  2016-06-29 19:49  src\bean

     目录          0  2016-06-29 20:22  src\client

     目录          0  2016-06-29 14:52  src\tree

     目录          0  2016-06-29 19:45  src

----------- ---------  ---------- -----  ----

                39343                    14