Leksik va sintaksis tahlil

e1=1;

}

}

if(line[t+1]=='+' || line[t+1]=='-' || line[t+1]=='*' || line[t+1]=='/' ){

// sintaksis tahlil uchun

if(d=="="){

cout<

e1=1;

}

}

44. 
    float a;
    
45. 
    // raqam ekanligini aniqlash
    
46. 
    if(atof(h.c_str())){ a=atof(h.c_str());
    
47. 
    cout<<"NUMBER("<
    
48. 
    }
    
49. 
    else if(e1!=1){
    
50. 
    cout<<"IDENTIFIKATOR("<
    

51. 
    cout<<"\t\t\t\t OPERATOR("<
    
52. 
    }
    
53. 
    h2=0; h.clear();
    
54. 
    }
    
55. 
    else if(d==";" || d==","){ e2=t; s1=1; s=0; s2=0;
    
56. 
    // sintksis tahlil uchun
    
57. 
    if((d!=",") && line[t-1]=='+' || line[t-1]=='-' || line[t-1]=='*' || line[t-1]=='/' ){
    
58. 
    if(d!="=" && (line[t-2]=='+' || line[t-2]=='-' || line[t-2]=='*' || line[t-2]=='/') ){
    
59. 
    cout<
    
60. 
    e1=1;
    
61. 
    }
    
62. 
    }
    
63. 
    if(line[t+1]=='+' || line[t+1]=='-' || line[t+1]=='*' || line[t+1]=='/' ){
    
64. 
    // sintksis tahlil uchun
    
65. 
    if(d==","){
    
66. 
    cout<
    
67. 
    e1=1;
    
68. 
    }
    
69. 
    }
    
70. 
    // raqam ekanligini aniqlash
    
71. 
    float a;
    
72. 
    if(atof(h.c_str())){ a=atof(h.c_str());
    
73. 
    cout<<"NUMBER("<
    
74. 
    }
    
75. 
    else if(e1!=1){
    
76. 
    cout<<"IDENTIFIKATOR("<
    
77. 
    cout<<"\t\t\t\t DELIMETR("<
    
78. 
    }
    
79. 
    h2=0; h.clear();
    
80. 
    }
    
81. 
    else if(d==" "){ s2=1; s=0; s1=0;
    
82. 
    float a;
    
83. 
    // raqam ekanligini aniqlash
    
84. 
    if(atof(h.c_str())){ a=atof(h.c_str());
    
85. 
    cout<<"NUMBER("<
    
86. 
    }
    
87. 
    else
    
88. 
    if(!h.empty()) cout<<"IDENTIFIKATOR("<
    
89. 
    h2=0; h.clear();
    
90. 
    }
    
91. 
    else {
    
92. 
    h=h+d; h2++;
    
93. 
    }
    
94. 
    } // for siklini tugashi - bitta satrni tugashi
    
95. 
    // vazifadagi belgilar uchramagan satrlar
    
96. 
    if(s==0 && s1==0 && s2==0) {
    
97. 
    cout<<"IDENTIFIKATOR("<
    
98. 
    }
    
99. 
    i++; // satrlar soni
    
100. 
     }
     
101. 
     getchar();
     
102. 
     return 0;
     
103. 
     }
     

Dastur natijasi:

Matnli fayl (1.cpp) ma’lumotlari:

Matindagi xatolik (6- satr, 18- belgi) - dasturning natijasida “Arifmetik ifodada + ishora ketma-ket kelgan” xabari bilan izohlangan. Ushbu ishoradan oldin ham + ishorasini tokenlar jadvali – (OPERATOR(6,17) - +) ko’rinishida keltirilgan.

Dastur tahlili:
Kiruvchi ma’lumotlar matnli fayldan o’zlashtirib olindi (1.cpp). Vazifada takidlangan belgilar (nuqta-vergul, identifikatorlar, haqiqiy sonlar, o’zlashtirish belgisi va figurali qavslar) ajratib olindi. Qolgan belgilar esa IDENTIFIKATOR ko’rinishida qabul qilindi. atof() funksiya bilan raqamga tekshirildi. Arifmetik ishoralar ketma-ketligi sintaksis tahli qilindi – ya’niy xar xil xatolik bo’ladigan vaziyatlar aniqlab olindi.
Masalan. Ishora o’rnida + ishorasi tanlandi.

1. 
   c=a++b;
   
2. 
   c=+a+b;
   
3. 
   c=a+b++;
   
4. 
   c=++a+b;
   
5. 
   c=a+b+;
   
6. 
   a+;
   
7. 
   +a;
   
8. 
   +;
   
9. 
   ;+;
   
10. 
    ,+
    
11. 
    +,
    
12. 
    int a++;
    

dastur 12 ta holat uchun sintaksis tahlil qiladi va ushbu 12 ta holat matnli faylda uchrasa xatolik haqida xabar chiqaradi.
Quyida Visual Studio ning Windows application muhitida tuzilgan tashqi ko’rinishga ega bo’lgan leksik tahli qiluvchi datur keltirilgan:
Dastur ko’rinishi quyidagicha:

Daturning to’liq matni:

1. 
   #pragma once
   
2. 
   #include"stdafx.h"
   
3. 
   #include
   
4. 
   #include
   
5. 
   #include
   
6. 
   #include
   

7. 
   #define INT 01
   
8. 
   #define CHAR 02
   
9. 
   #define FLOAT 03
   
10. 
    #define LONG 04
    
11. 
    #define DOUBLE 05
    
12. 
    #define STRUCT 06
    
13. 
    #define PRINTF 07
    
14. 
    #define SCANF 08
    
15. 
    #define FOR 09
    
16. 
    #define DO 10
    
17. 
    #define WHILE 11
    
18. 
    #define IF 12
    
19. 
    #define ELSE 13
    
20. 
    #define CONTINUE 14
    
21. 
    #define BREAK 15
    
22. 
    #define DEFAULT 16
    
23. 
    #define CASE 17
    
24. 
    #define GOTO 18
    
25. 
    #define SWITCH 19
    
26. 
    #define OB 20
    
27. 
    #define CB 21
    
28. 
    #define LP 22
    
29. 
    #define RP 23
    
30. 
    #define EQUALTO 24
    
31. 
    #define LT 25
    
32. 
    #define GT 26
    
33. 
    #define PLUS 27
    
34. 
    #define MINUS 28
    
35. 
    #define MUL 29
    
36. 
    #define DIV 30
    
37. 
    #define COLON 31
    
38. 
    #define SCOLON 32
    
39. 
    #define TERNARY 33
    
40. 
    #define COMMA 34
    
41. 
    #define PLINE 35
    
42. 
    #define CARAT 36
    
43. 
    #define DIGIT 37
    
44. 
    #define ID 38
    
45. 
    #define OSB 39
    
46. 
    #define CSB 40
    
47. 
    #define HSH 41
    
48. 
    #define PER 42
    
49. 
    #define MAIN 43
    
50. 
    #define VOID 44
    
51. 
    #define NOTEQU 45
    
52. 
    #define AND 46
    
53. 
    #define BSH 47
    
54. 
    #define DQ 48
    
55. 
    #define SQ 49
    
56. 
    #define DOT 50
    
57. 
    #define INCLUDE 51
    
58. 
    #define SPACE 52
    
59. 
    #define TAB 53
    
60. 
    #define NUM_ENTRIES 54
    
61. 
    int token_no=0,key=0,ident=0,sp=0,op=0,digit=0;
    
62. 
    char keyM[100][100],identM[100][100],spM[10000],opM[100][100],digitM[1000];
    

63. 
    using namespace std;
    

64. 
    struct table
    
65. 
    {
    
66. 
    char name[25];
    
67. 
    int token;
    
68. 
    };
    

69. 
    struct table ref_tab[NUM_ENTRIES] = {
    

70. 
    {"int", INT},
    
71. 
    {"char", CHAR},
    
72. 
    {"float", FLOAT},
    
73. 
    {"long", LONG},
    
74. 
    {"double", DOUBLE},
    
75. 
    {"struct", STRUCT},
    
76. 
    {"printf", PRINTF},
    
77. 
    {"do", DO},
    
78. 
    {"while", WHILE},
    
79. 
    {"if", IF},
    
80. 
    {"else", ELSE},
    
81. 
    {"continue", CONTINUE},
    
82. 
    {"break", BREAK},
    
83. 
    {"default", DEFAULT},
    
84. 
    {"case", CASE},
    
85. 
    {"goto", GOTO},
    
86. 
    {"switch", SWITCH},
    
87. 
    {"{", OB},
    
88. 
    {"}", CB},
    
89. 
    {"(", LP},
    
90. 
    {")", RP},
    
91. 
    {"=", EQUALTO},
    
92. 
    {"<", LT},
    
93. 
    {">", GT},
    
94. 
    {"+", PLUS},
    
95. 
    {"-", MINUS},
    
96. 
    {"*", MUL},
    
97. 
    {"/", DIV},
    
98. 
    {":", COLON},
    
99. 
    {";", SCOLON},
    
100. 
     {"?", TERNARY},
     
101. 
     {",", COMMA},
     
102. 
     {"|", PLINE},
     
103. 
     {"^", CARAT},
     
104. 
     {"[", OSB},
     
105. 
     {"]", CSB},
     
106. 
     {"#", HSH},
     
107. 
     {"%", PER},
     
108. 
     {"main", MAIN},
     
109. 
     {"void", VOID},
     
110. 
     {"!=", NOTEQU},
     
111. 
     {"&", AND},
     
112. 
     {"\\",BSH},
     
113. 
     {"\"",DQ},
     
114. 
     {"'", SQ},
     
115. 
     {"include",INCLUDE},
     
116. 
     };
     

117. 
     char out_token[NUM_ENTRIES+1][40]=
     
118. 
     {
     
119. 
     " ",
     
120. 
     "INT",
     
121. 
     "CHAR",
     
122. 
     "FLOAT",
     
123. 
     "LONG",
     
124. 
     "DOUBLE",
     
125. 
     "STRUCT",
     
126. 
     "PRINTF",
     
127. 
     "SCANF",
     
128. 
     "FOR",
     
129. 
     "DO",
     
130. 
     "WHILE",
     
131. 
     "IF",
     
132. 
     "ELSE",
     
133. 
     "CONTINUE",
     
134. 
     "BREAK",
     
135. 
     "DEFAULT",
     
136. 
     "CASE",
     
137. 
     "GOTO",
     
138. 
     "SWITCH",
     
139. 
     "{",
     
140. 
     "}",
     
141. 
     "(",
     
142. 
     ")",
     
143. 
     "=",
     
144. 
     "<",
     
145. 
     ">",
     
146. 
     "+",
     
147. 
     "-",
     
148. 
     "*",
     
149. 
     "/",
     
150. 
     ":",
     
151. 
     ";",
     
152. 
     "?",
     
153. 
     ",",
     
154. 
     "|",
     
155. 
     "^",
     
156. 
     "DIGIT",
     
157. 
     "ID",
     
158. 
     "[",
     
159. 
     "]",
     
160. 
     "#",
     
161. 
     "%",
     
162. 
     "MAIN",
     
163. 
     "VOID",
     
164. 
     "!=",
     
165. 
     "&",
     
166. 
     "\\",
     
167. 
     "\"",
     
168. 
     "'",
     
169. 
     ".",
     
170. 
     "INCLUDE"
     
171. 
     };
     
172. 
     namespace Leksik_analizator {
     
173. 
     using namespace System;
     
174. 
     using namespace System::ComponentModel;
     
175. 
     using namespace System::Collections;
     
176. 
     using namespace System::Windows::Forms;
     
177. 
     using namespace System::Data;
     
178. 
     using namespace System::Drawing;
     
179. 
     ///
     
     

     
     /// Summary for Form1
     

     
     ///
     
     
180. 
     public ref class Form1 : public System::Windows::Forms::Form
     
181. 
     {
     
182. 
     public:
     
183. 
     Form1(void)
     
184. 
     {
     
185. 
     InitializeComponent();
     
186. 
     //
     
187. 
     //TODO: Add the constructor code here
     
188. 
     //
     
189. 
     }
     
190. 
     protected:
     
191. 
     ///
     
     

     
     /// Clean up any resources being used.
     

     
     ///
     
     
192. 
     ~Form1()
     
193. 
     {
     
194. 
     if (components)
     
195. 
     {
     
196. 
     delete components;
     
197. 
     }
     
198. 
     }
     
199. 
     private: System::Windows::Forms::DataGridView^ dataGridView1;
     
200. 
     protected:
     
201. 
     private: System::Windows::Forms::DataGridViewTextBoxColumn^ Column1;
     
202. 
     private: System::Windows::Forms::DataGridViewTextBoxColumn^ Column2;
     
203. 
     private: System::Windows::Forms::DataGridViewTextBoxColumn^ Column3;
     
204. 
     private: System::Windows::Forms::DataGridViewTextBoxColumn^ Column4;
     
205. 
     private: System::Windows::Forms::DataGridViewTextBoxColumn^ Column5;
     
206. 
     private: System::Windows::Forms::Button^ button1;
     
207. 
     private: System::Windows::Forms::TextBox^ textBox1;
     
208. 
     private: System::Windows::Forms::Label^ label1;
     
209. 
     private: System::Windows::Forms::Label^ label2;
     
210. 
     private: System::Windows::Forms::Label^ label3;
     
211. 
     private: System::Windows::Forms::Label^ label4;
     
212. 
     private: System::Windows::Forms::Label^ label5;
     
213. 
     private:
     
214. 
     ///
     
     

     
     /// Required designer variable.
     

     
     ///
     
     
215. 
     System::ComponentModel::Container ^components;
     
216. 
     #pragma region Windows Form Designer generated code
     
217. 
     ///
     
     

     
     /// Required method for Designer support - do not modify
     

     
     /// the contents of this method with the code editor.
     

     
     ///
     
     
218.