complier.cs

实现了此法分析器和语法分析器 有详细的代码和文档

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Collections.Specialized;

namespace ComplierForm
{
    public partial class Complier : Form
    {
        
        private  string[,] StringCodeWord;//存放保留字的二维数组
        private bool beginString = true; //判断是否为首字符
        private string stringPath = null; //存放打开的源文件的路径
        private static string stringAdd = "";   //对读入的每个字符进行拼接
        private static string[] stringOut=new string[2];  //用于输出模块存放保留字和码值
        private StreamWriter sw1 = null;  //用于把非法字符存入Error.txt文件
        private static int countErrorLine = 0; //用于给出非法字符行的行号
        private static bool ErrorString = false;
        private static int countChar = 0; //用于给出非法字符的位置
        public Complier()
        {
            InitializeComponent();

           
        }

        private void buttonLoadFile_Click(object sender, EventArgs e)
        {
            
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "txt Files(*.txt)|*.txt|All Files(*.*)|*.*";            
            openFileDialog1.RestoreDirectory = true;           
            if ((openFileDialog1.ShowDialog() == DialogResult.OK) && (openFileDialog1.FileName.Length > 0))
            {
                if ((File.Exists(openFileDialog1.FileName))==true) //如果文件存在
                {
                    buttonComplie.Enabled = true;
                    stringPath = openFileDialog1.FileName;//为后边建立文件流给出文件路径
                    richTextBoxSourceFile.Clear();
                    richTextBoxSourceFile.LoadFile(openFileDialog1.FileName, RichTextBoxStreamType.PlainText);
                    sw1 = File.CreateText(Directory.GetCurrentDirectory()+"\\Error.txt");//进行错误处理
                    
                }
            }
            

        }
        
        private void Complier_Load(object sender, EventArgs e)
        {
            #region  把关键字从文件中倒入二维数组中
            try
            {
               
                buttonComplie.Enabled = false;
               
                listViewCode.GridLines = true; //设置listview的属性
                listViewCode.FullRowSelect = true;
                listViewCode.AllowColumnReorder = true;
                string CodeWordPath = Directory.GetCurrentDirectory() + "//CodeTable.txt";
                StreamReader sr = new StreamReader(CodeWordPath);
                StringCollection stringcollection = new StringCollection();//无需给出初始值的大小
                string oneLine;
                while ((oneLine = sr.ReadLine()) != null) //读到文件末尾将返回null
                {
                    stringcollection.Add(oneLine.Trim());
                }
                sr.Close();
                int length = stringcollection.Count;              
                string[] stringArray=new string[length];
                stringcollection.CopyTo(stringArray, 0);
                StringCodeWord=new string[length,2];    //此例中，length=35
                //为数组赋值
                for (int i = 0; i < length; i++)
                {
                    string[] splitString = stringArray[i].Split(' ');   //把每行的数据分开存在二维数组中 
                    StringCodeWord[i,0]=splitString[0].Trim();
                    StringCodeWord[i,1]=splitString[1].Trim();
                    
                }        
            }
            catch
            {
               
               MessageBox.Show("关键字表文件不存在！","警告！",MessageBoxButtons.OK,MessageBoxIcon.Warning);
           }
            #endregion
       }
        //拼读一个单词模块scan
        private string Scan(char stringChar)
        {
           // MessageBox.Show(stringAdd);
            if (stringChar == '\n')
            {
                Look("\\n");
                if ((stringAdd.Trim().Length != 0) && (stringAdd.Trim() != ";") && (stringAdd.Trim() != ".") && (stringAdd.Trim() != ","))
                {
                    Look(stringAdd);

                }
                countErrorLine += 1;  //用于判断是哪一行出错了，执行到出错行的时候停止编译，给出提示信息
                beginString = true;
                stringAdd = "";
                return stringAdd;
            }
            //if (((int)stringChar) == 10)
            //{

            //    if ((stringAdd.Trim().Length != 0) && (stringAdd.Trim() != ";") && (stringAdd.Trim() != ".") && (stringAdd.Trim() != ","))
            //    {

            //        Look(stringAdd);
            //    }
            //    //MessageBox.Show(((int)(stringChar)).ToString());
            //    countErrorLine += 1;  //用于判断是哪一行出错了，执行到出错行的时候停止编译，给出提示信息
            //    beginString = true;
            //    stringAdd = "";
            //    // MessageBox.Show(countErrorLine.ToString());
            //    return stringAdd;
            //}
           
            if(stringChar==' ')  //如果是空格的话，把标志为置为true，因为空格后边读入的肯定是个新的字符串
            {
                if (stringAdd.Trim().Length >0)
                {
                    Look(stringAdd);
                    
                }
                  //清空拼接字符串，以便接受一个新的字符
                stringAdd = "";
                beginString=true;
                return stringAdd;
                
            }

            if (beginString ==true)  //如果此字符是字符串的第一个字符，分为数字和字母两种情况
            {
               
                if(stringChar!=' ')
                {
                   
                    beginString = false;
                    stringAdd += stringChar;  //不管首字符是数字还是字符，都赋给拼接字符串 stringAdd
                   //MessageBox.Show(stringAdd);
                }
            }
            else if (beginString == false)  //如果此字符不是字符串的第一个字符，根据字符决定如何拼接
            {
                switch(stringChar)
                {
                    
                    case ',':      //设置一个标志为来判断此时传来的是否为一个字符串的开始                
                         if (stringAdd.Trim() != "")
                         {
                             Look(stringAdd);
                             stringAdd = "";
                         }
                         Look(",");         //如果是“，”，直接查表
                         stringAdd = "";
                         beginString = true;
                         return stringAdd;
                                        

                    case  ';':                
                        if (stringAdd.Trim() != "")
                         {
                           
                             Look(stringAdd);
                             stringAdd = "";
                          }                              
                         Look(";");  //如果是“；”，直接查表
                         stringAdd = "";
                         beginString = true;
                         return stringAdd;
                        
                     case '.':
                         if (stringAdd.Trim() != "")
                         {
                          //   MessageBox.Show(stringChar.ToString());
                             Look(stringAdd);
                             stringAdd = "";
                         }
                         Look(".");  //如果是“.”，直接查表
                         stringAdd = "";                       
                         beginString = true;
                         return stringAdd;
                         
                    case '+':
                         if (stringAdd.Trim() != "")
                         {
                             Look(stringAdd);
                             stringAdd = "";
                          }
                          Look("+");  //如果是“+”，直接查表
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                         
                      case '-':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = "";
                          }
                          Look("-");  //如果是“-”，直接查表
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                        
                      case '*':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = "";
                          }
                          Look("*");  //如果是“*”，直接查表
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                          
                      case '/':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = "";
                          }
                          Look("/");  //如果是“/”，直接查表
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                         
                      case '=':
                          if (stringAdd.Trim() != "")
                          {
                              if (stringAdd.Trim().EndsWith(":", true,null))      //":="
                              {
                                  stringAdd += stringChar;
                                  Look(stringAdd);
                                  stringAdd = "";
                                
                              }
                              else if (stringAdd.Trim().EndsWith(">", true, null))  //  ">="
                              {
                                  stringAdd += stringChar;
                                  Look(stringAdd);
                                  stringAdd = "";
                              }
                              else if (stringAdd.Trim().EndsWith("<", true, null))  //  "<="
                              { 
                                  stringAdd += stringChar;
                                  Look(stringAdd);
                                  stringAdd = ""; 
                              }
                          }
                             
                          else
                          {
                             
                              Look("=");  //如果是“=”，直接查表    
                              stringAdd = "";
                          }
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                          
                      case '>':
                          if (stringAdd.Trim() != "")
                          {
                              if (stringAdd.EndsWith("<", true, null))
                              {
                                  stringAdd += stringChar;
                                  Look(stringAdd);
                                  stringAdd = "";
                                  beginString = true;
                              }
                              else if (stringAdd.EndsWith("<", true, null) == false) //如果上个符号不是“<”,就要查找上个字符串
                              {
                                  Look(stringAdd);
                                  stringAdd = stringChar.ToString().Trim();
                                  beginString = false;
                              }
                          }
                          else
                          {
                              stringAdd = stringChar.ToString().Trim();   //把“>”放入字符串一边检查是否是符号 “>=”                             
                              beginString = false;       //这个地方不可以查“>”表，因为又可能是符号“>=”
                          }
                          return stringAdd;
                          
                      case '<':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = stringChar.ToString();    //不可以对“<”查表，因为可能是符号“<=”和“<”                        
                              beginString = false;      //现在就对“<”查表，会把符号“<=”解析成两个符号
                          }                             //"<" 和 "<="
                          else
                          {
                              stringAdd = stringChar.ToString();
                              beginString = false;
                          }
                          return stringAdd;
                          
                      case '(':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = "";
                          }
                          Look("(");  //如果是“(”，直接查表
                          stringAdd = "";
                          beginString = true;
                          return stringAdd;
                          
                      case ')':
                          if (stringAdd.Trim() != "")
                          {
                              Look(stringAdd);
                              stringAdd = "";
                          }
                          Look(")");  //如果是“+”，直接查表
                          stringAdd = "";
                          beginString = true;