效果：

代碼：

1: using System; 2: using System.Collections.Generic; 3: using System.ComponentModel; 4: using System.Data; 5: using System.Drawing; 6: using System.Linq; 7: using System.Text; 8: using System.Windows.Forms; 9: ? 10: namespace 詞法分析 11: { 12: public partial class Form1 : Form 13: { 14: public int Count = 0; 15: public bool EndFlag = false; 16: public char MString; 17: public string StartString = ""; 18: public string EndString = ""; 19: public string FirstString = " "; 20: public string Sym = " "; 21: Dictionary<string, int> Table = new Dictionary<string, int>(); 22: ? 23: public Form1() 24: { 25: InitializeComponent(); 26: } 27: ? 28: private void textBox1_TextChanged(object sender, EventArgs e) 29: { 30: if (textBox1.Text == "") 31: { 32: Count = 0; 33: StartString = ""; 34: FirstString = " "; 35: EndString = ""; 36: this.pictureBox2.Image = null; 37: this.label2.Text = ""; 38: MyDataView.Rows.Clear(); 39: } 40: if (textBox1.Text.Length - 1>=0) 41: MString = textBox1.Text.Substring(textBox1.Text.Length - 1, 1)[0]; 42: else MString =' '; 43: Table = new Dictionary<string, int>(); 44: ? 45: ? 46: Table.Add("begin", 1); 47: Table.Add("end", 2); 48: Table.Add("if", 3); 49: Table.Add("then", 4); 50: Table.Add("else", 5); 51: Table.Add("while", 6); 52: Table.Add("do", 7); 53: Table.Add("標識符", 8); 54: Table.Add("整常數", 9); 55: Table.Add("+", 10); 56: Table.Add("-", 11); 57: Table.Add("*", 12); 58: Table.Add("/", 13); 59: Table.Add("<=", 14); 60: Table.Add("<>", 15); 61: Table.Add("<", 16); 62: Table.Add(":", 17); 63: Table.Add(":=", 18); 64: Table.Add(";", 19); 65: Table.Add("(", 18); 66: Table.Add(")", 19); 67: Table.Add("$", 20); 68: Table.Add("id", 21); 69: EndProc(); 70: } 71: 72: private void EndProc() 73: { 74: if (char.IsLetter(FirstString[0])) 75: { 76: if (char.IsLetter(MString) || char.IsDigit(MString)) 77: { 78: StartString += MString; 79: FirstString = StartString[0].ToString(); 80: } 81: else 82: { 83: if (MString != ' ' || MString != '\n') 84: { 85: EndString = StartString; 86: StartString = MString.ToString(); 87: FirstString = StartString[0].ToString(); 88: } 89: 90: switch (EndString) 91: { 92: case "begin": 93: EndString = "begin"; 94: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 95: StartString = ""; 96: FirstString = " "; 97: break; 98: case "end": 99: EndString = "end"; 100: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 101: StartString = ""; 102: FirstString = " "; 103: break; 104: case "if": 105: EndString = "if"; 106: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 107: StartString = ""; 108: FirstString = " "; 109: break; 110: case "then": 111: EndString = "then"; 112: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 113: StartString = ""; 114: FirstString = " "; 115: break; 116: case "else": 117: EndString = "else"; 118: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 119: StartString = ""; 120: FirstString = " "; 121: break; 122: case "while": 123: EndString = "while"; 124: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 125: StartString = ""; 126: FirstString = " "; 127: break; 128: case "do": 129: EndString = "do"; 130: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 131: StartString = ""; 132: FirstString = " "; 133: break; 134: case "id": 135: EndString = "id"; 136: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 137: StartString = ""; 138: FirstString = " "; 139: break; 140: default : 141: EndString = "標識符"; 142: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 143: StartString = ""; 144: FirstString = " "; 145: break; 146: } 147: EndProc(); 148: EndFlag = true; 149: } 150: } 151: else if (char.IsDigit(FirstString[0])) 152: { 153: if (char.IsDigit(MString)) 154: { 155: StartString += MString; 156: FirstString = StartString[0].ToString(); 157: } 158: else 159: { 160: if (MString != ' ' || MString != '\n') 161: { 162: EndString = StartString; 163: StartString = MString.ToString(); 164: FirstString = StartString[0].ToString(); 165: } 166: StartString = ""; 167: FirstString = " "; 168: EndFlag = true; 169: EndString = "整常數"; 170: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 171: EndProc(); 172: } 173: } 174: else if (FirstString == "<") 175: { 176: if (MString=='=') 177: { 178: StartString = ""; 179: FirstString = " "; 180: EndFlag = true; 181: EndString = "<="; 182: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 183: } 184: else if (MString == '>') 185: { 186: StartString = ""; 187: FirstString = " "; 188: EndFlag = true; 189: EndString = "<>"; 190: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 191: } 192: else 193: { 194: if (MString != ' ' || MString != '\n') 195: { 196: EndString = StartString; 197: StartString = MString.ToString(); 198: FirstString = StartString[0].ToString(); 199: } 200: StartString = ""; 201: FirstString = " "; 202: EndFlag = true; 203: EndString = "<"; 204: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 205: EndProc(); 206: } 207: } 208: else if (FirstString == ":") 209: { 210: if (MString == '=') 211: { 212: StartString = ""; 213: FirstString = " "; 214: EndFlag = true; 215: EndString = ":="; 216: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 217: } 218: else 219: { 220: if (MString != ' ' || MString != '\n') 221: { 222: EndString = StartString; 223: StartString = MString.ToString(); 224: FirstString = StartString[0].ToString(); 225: } 226: StartString = ""; 227: FirstString = " "; 228: EndFlag = true; 229: EndString = ":"; 230: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 231: EndProc(); 232: } 233: } 234: else switch (MString) 235: { 236: case '+': 237: StartString = ""; 238: FirstString = " "; 239: EndFlag = true; 240: EndString = "+"; 241: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 242: break; 243: case '-': 244: StartString = ""; 245: FirstString = " "; 246: EndFlag = true; 247: EndString = "-"; 248: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 249: break; 250: case '*': 251: StartString = ""; 252: FirstString = " "; 253: EndFlag = true; 254: EndString = "*"; 255: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 256: break; 257: case '/': 258: StartString = ""; 259: FirstString = " "; 260: EndFlag = true; 261: EndString = "/"; 262: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 263: break; 264: case '(': 265: StartString = ""; 266: FirstString = " "; 267: EndFlag = true; 268: EndString = "("; 269: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 270: break; 271: case ')': 272: StartString = ""; 273: FirstString = " "; 274: EndFlag = true; 275: EndString = ")"; 276: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 277: break; 278: case '$': 279: StartString = ""; 280: FirstString = " "; 281: EndFlag = true; 282: EndString = "$"; 283: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 284: break; 285: case ';': 286: StartString = ""; 287: FirstString = " "; 288: EndFlag = true; 289: EndString = ";"; 290: MyDataView.Rows.Add(++Count, EndString, Table[EndString]); 291: break; 292: case '<': 293: StartString = MString.ToString(); 294: FirstString = StartString[0].ToString(); 295: break; 296: case ':': 297: StartString = MString.ToString(); 298: FirstString = StartString[0].ToString(); 299: break; 300: default: 301: if (char.IsLetter(MString)) 302: { 303: StartString += MString; 304: FirstString = StartString[0].ToString(); 305: } 306: if (char.IsDigit(MString)) 307: { 308: StartString += MString; 309: FirstString = StartString[0].ToString(); 310: } 311: break; 312: } 313: } 314: ? 315: private void button1_Click(object sender, EventArgs e) 316: { 317: Count = 0; 318: Scaner(); 319: E(); 320: if (Sym == "$") 321: { 322: if(this.pictureBox2.Image == null) 323: this.pictureBox2.Image = Image.FromFile("./圖片/笑臉.jpg"); 324: this.label2.Text = "Excellent work！！"; 325: } 326: else 327: Error(); 328: } 329: ? 330: private void Scaner() 331: { 332: try 333: { 334: Sym = MyDataView[1, Count++].Value.ToString(); 335: } 336: catch 337: { 338: MessageBox .Show ("請輸入終止符$!!"); 339: } 340: } 341: ? 342: private void E() 343: { 344: T(); 345: Epie(); 346: } 347: ? 348: private void Epie() 349: { 350: if (Sym == "+") 351: { 352: Scaner(); 353: T(); 354: Epie(); 355: } 356: else if (Sym != ")" && Sym != "$") 357: Error(); 358: } 359: ? 360: private void T() 361: { 362: F(); 363: Tpie(); 364: } 365: ? 366: private void Tpie() 367: { 368: if (Sym == "*") 369: { 370: Scaner(); 371: F(); 372: Tpie(); 373: } 374: else if (Sym != ")" && Sym != "$" && Sym != "+") 375: Error(); 376: } 377: ? 378: private void F() 379: { 380: if (Sym == "id") 381: Scaner(); 382: else if (Sym == "(") 383: { 384: Scaner(); 385: E(); 386: if (Sym == ")") 387: Scaner(); 388: else Error(); 389: } 390: else Error(); 391: } 392: ? 393: private void Error() 394: { 395: this.pictureBox2.Image = Image.FromFile("./圖片/哭臉.jpg"); 396: this.label2.Text = "Error input！！"; 397: } 398: } 399: }

轉載于:https://www.cnblogs.com/lcxu2/archive/2011/04/23/2025846.html

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