form1.cs

一个自己制作的词法分析器

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

namespace Lexeme
{
    public partial class mainForm : Form
    {
        /// <summary>
        /// 定义5种类型的字符集合，分别为基本字，界符，操作符，常量和变量
        /// </summary>
        public class PrimaryWord
        {
            public string[,] primaryword = new string[13, 2] { { "begin", "1" }, { "end", "2" } ,
                                                        {"ood","3"},{"if","4"},{"then","5"},
                                                        {"call","6"},{"while","7"},{"do","8"},
                                                        {"read","9"},{"const","10"},{"var","11"},
                                                        {"procedure","12"},{"write","13"}};
            public string this[string s]//索引器
            {
                get
                {
                    for (int i = 0; i < 13; i++)
                    {
                        if (primaryword[i, 0] == s) return primaryword[i, 1];
                    }
                    return "Error";
                }
            }
        }
        public class Delimiter
        {
            public string[,] delimiter = new string[7, 2] { { ";", "1" }, { ":=", "2" } ,
                                                            {",","3"},{"(","4"},{")","5"},{ ":", "6" },
                                                            {".","7"}};
            public string this[string s]//索引器
            {
                get
                {
                    for (int i = 0; i < 6; i++)
                    {
                        if (delimiter[i, 0] == s) return delimiter[i, 1];
                    }
                    return "Error";
                }
            }
        }
        public class Operato
        {
            public string[,] operato = new string[10, 2] { { "+", "1" }, { "-", "2" } ,
                                                         {"*","3"},{"/","4"},{"<=","5"},
                                                         { ">=", "6" },{"<","7"},{">","8"},
                                                         {"=","9"},{"#","10"}};
            public string this[string s]//索引器
            {
                get
                {
                    for (int i = 0; i < 10; i++)
                    {
                        if (operato[i, 0] == s) return operato[i, 1];
                    }
                    return "Error";
                }
            }
        }
        public class ConstVal
        {
            public string[,] constval = new string[100, 2];
        }
        public class Varval
        {
            public string[,] varval = new string[100, 2];
        }

        public PrimaryWord pw = new PrimaryWord();
        public Delimiter dl = new Delimiter();
        public Operato op = new Operato();
        public ConstVal cv = new ConstVal();
        public Varval vv = new Varval();
        public static int constCount = 0, varCount = 0, wordCount = 0;//constCount为常量的个数，varCount为变量个数，wordCount为整个程序里字符的个数
        public static int end = 0, start = 0;//开始表示和结束标志，做指针用
        public static string inText,outText;//存储导入的程序字符串
        public static string[,] resultArr = new string[100,3];//保存区分后的每种字符
        public DataTable dt;
        public DataColumn dc;
        public DataRow dr;

        public void reset()//重置参数
        {
            constCount = 0;
            varCount = 0;
            wordCount = 0;
            end = 0;
            start = 0;
            inText = "";
        }

        public mainForm()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (Timebar.Value < 100)//进度条增加
            {
                Timebar.Value++;
            }
            else if (Timebar.Value == 100)
            {
                Result.Text = outText;
                timer1.Enabled = false;
                Classify();//调用区分词种函数
                Matching();
                Print();
            }
        }

        private void mainForm_Load(object sender, EventArgs e)
        {           
            //创建内存表 
            dt = new DataTable();
            dc = new DataColumn();
            dc.ColumnName = "Word";
            dt.Columns.Add(dc);
            dc = new DataColumn();
            dc.ColumnName = "Class";
            dt.Columns.Add(dc);
            dc = new DataColumn();
            dc.ColumnName = "Kind";
            dt.Columns.Add(dc);
            dataGridView1.DataSource = dt;
            
        }

        private void Import_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "Text File(*.txt)|*.txt";
            openFileDialog1.Title = "Please import your code";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                System.IO.StreamReader input1 = new System.IO.StreamReader(openFileDialog1.FileName);                
                importText.Text = input1.ReadToEnd();//去除字符串中的回车              
                input1.Close();              
                reset();
            }
            System.IO.StreamReader input2 = new System.IO.StreamReader(openFileDialog1.FileName);
            inText = input2.ReadToEnd().Replace("\r", "").Replace("\n", " ");
            input2.Close();
        }

        private void Analysis_Click(object sender, EventArgs e)
        {
            if (Timebar.Value == 100)
                Timebar.Value = 0;
            timer1.Enabled = true;         
        }

        private void Save_Click(object sender, EventArgs e)
        {
            saveFileDialog1.Filter = "Text File(*.txt)|*.txt";
            saveFileDialog1.Title = "Please save your analysis result";
            if(saveFileDialog1.ShowDialog()==DialogResult.OK)
            {
                System.IO.StreamWriter output = new System.IO.StreamWriter(saveFileDialog1.FileName);
                output.Write(outText);
                output.Close();
            }
        }
        public void Classify()
        {
            int x=0;//记录end位置，因为在判断是否为字母和数字时，end不能处于文本尾部
            while (end <= inText.Length)
            {
                if (end != inText.Length)
                {
                    x = end;
                }
                if ((char.IsLetter(inText, x) | char.IsDigit(inText, x)) & end != inText.Length)//判断end位置是否为数字或字母，如是则end++
                {
                    end++;
                    continue;
                }
                else if (end == inText.Length)//当end已指向文本尾部时，将当前start到end的字符存入数组
                {
                    resultArr[wordCount,0] = inText.Substring(start, end - start);
                    wordCount++;
                    end++;
                }