Compile-Experiment/Lex.cpp at master · TGWarwolf/Compile-Experiment · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
// Lex.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<stdio.h>
#include<string.h>

int Tex(char * source, char * destination, char * error);
int IsLetter(char ch);
int IsNumber(char ch);
int WordType(char * name);
void Output(FILE * fp, char * name, int type);
void Error(FILE * fp, int line_count, char * type);
int main(){
	Tex("test.pas", "test.dyd", "test.err");
    return 0;
}
int Tex(char * source, char * destination, char * error) {
	FILE *fps,*fpd,*fpe;
	char ch;
	char word[17];
	int word_count = 0, line_count = 1;
	int back_flag = 0;
	fps = fopen(source, "r");
	fpd = fopen(destination, "w+");
	fpe = fopen(error, "w+");

	while (true) {
		word_count = 0;
		if (!back_flag) {
			ch = fgetc(fps);
		}
		if (' ' == ch) {
			back_flag = 0;
		}
		else if (IsLetter(ch)) {
			while ((IsLetter(ch)||IsNumber(ch))&&word_count<16) {
				word[word_count] = ch;
				word_count++;
				ch = fgetc(fps);
			}
			word[word_count] = '\0';
			back_flag = 1;
			Output(fpd, word, WordType(word));
			continue;
		}
		else if (IsNumber(ch)) {
			while (IsNumber(ch) && word_count<16) {
				word[word_count] = ch;
				word_count++;
				ch = fgetc(fps);
			}
			word[word_count] = '\0';
			back_flag = 1;
			Output(fpd, word, 11);
			continue;
		}
		else {
			switch (ch) {
			case '=':
				Output(fpd, "=", 12);
				break;
			case '<':
				ch = fgetc(fps);
				if ('>' == ch) {
					Output(fpd, "<>", 13);
				}
				else if ('=' == ch) {
					Output(fpd, "<=", 14);
				}
				else {
					Output(fpd, "<", 15);
					back_flag = 1;
					continue;
				}
				break;
			case '>':
				ch = fgetc(fps);
				if ('=' == ch) {
					Output(fpd, ">=", 16);
				}
				else {
					Output(fpd, ">", 17);
					back_flag = 1;
					continue;
				}
				break;
			case '-':
				Output(fpd, "-", 18);
				break;
			case '*':
				Output(fpd, "*", 19);
				break;
			case ':':
				ch = fgetc(fps);
				if ('=' == ch) {
					Output(fpd, ":=", 20);
				}
				else {
					Error(fpe, line_count, "\':\' not match");
					back_flag = 1;
					continue;
				}
				break;
			case '(':
				Output(fpd, "(", 21);
				break;
			case ')':
				Output(fpd, ")", 22);
				break;
			case ';':
				Output(fpd, ";", 23);
				break;
			case '\n':
				Output(fpd, "EOLN", 24);
				line_count++;
				break;
			case EOF:
				Output(fpd, "EOF", 25);
				fclose(fps);
				fclose(fpd);
				fclose(fpe);
				return 1;
			default:
				Error(fpe, line_count, "illegal character");
			}
		}
		back_flag = 0;
	}

	fclose(fps);
	fclose(fpd);
	fclose(fpe);
	return 0;
}
int IsLetter(char ch) {
	if ((ch >= 'a'&&ch <= 'z') || (ch >= 'A'&&ch <= 'Z'))return true;
	return false;
}
int IsNumber(char ch) {
	if (ch >= '0'&&ch <= '9')return true;
	return false;
}
void Output(FILE * fp, char * name, int type) {
	fprintf(fp, "%16s ", name);
	if (type < 10)fprintf(fp, "0");
	fprintf(fp, "%d\n", type);
}
void Error(FILE * fp, int line_count, char * type) {
	fprintf(fp, "***LINE:%d  %s\n", line_count, type);
}
int WordType(char * name) {
	if (!strcmp(name, "begin"))return 1;
	if (!strcmp(name, "end")) return 2;
	if (!strcmp(name, "integer"))return 3;
	if (!strcmp(name, "if"))return 4;
	if (!strcmp(name, "then"))return 5;
	if (!strcmp(name, "else"))return 6;
	if (!strcmp(name, "function"))return 7;
	if (!strcmp(name, "read"))return 8;
	if (!strcmp(name, "write"))return 9;
	return 10;
}