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
|
#include "tcyacc.h"
#include "y.tab.h"
#include "string.h"
#include "parser.h"
#include "stdio.h"
#include <stdlib.h>
extern int lineno;
extern char *eemalloc();
extern Keyword keywords[];
tclex() /* tc lexical analyzer */
{
/* recognize comments started with #. 3/2/93 */
extern FILE *fin;
int c;
int s;
while ((c=getc(fin)) == ' ' || c == '\t');
/* skip comments which are started with # */
if (c == '#')
do {
while ((c=getc(fin)) != EOF && c != '\n');
lineno++;
if (c == EOF)
return 0;
} while ((c=getc(fin)) == '#');
if (c == EOF)
return 0;
if (isdigit(c)) {
ungetc(c, fin);
fscanf(fin, "%d", &yylval.vali);
return (TOKEN_INT);
}
if (isalpha(c)) { /* keywords */
char sbuf[BUF_LEN], *p = sbuf;
do {
if (p >= sbuf + sizeof(sbuf) - 1) {
*p = '\0';
execerror("name too long", sbuf);
}
*p++ = c;
} while ((c=getc(fin)) != EOF && c != ':' && c != '\n');
if (c == '\n')
ungetc(c, fin);
*p = '\0';
if ((s = lookup(sbuf)) == 0)
execerror("invalid key word", sbuf);
if (s == ENUM || s == SUBG || s == RES || s == DI){
p = sbuf;
while ((c=getc(fin)) != EOF && c != '\n') {
if (p >= sbuf + sizeof(sbuf) - 1) {
*p = '\0';
execerror("name too long", sbuf);
}
*p++ = c;
}
*p = '\0';
lineno++;
yylval.words = (char *) eemalloc(100);
strcpy(yylval.words, sbuf);
}
return (s);
}
switch (c) {
case ',': return c;
case ';': return c;
case '\n': lineno++; return c;
default: fprintf(fout," lexical error in line %d near %c\n",lineno, c);
exit(1);
}
}
lookup(s)
char *s;
{
int i;
s[4] = '\0';
for (i = 0; i < KEY_LEN; i++)
if (strcmp(keywords[i].name, s) == 0)
return (keywords[i].kval);
s[3] = '\0';
for (i = 0; i < KEY_LEN; i++)
if (strcmp(keywords[i].name, s) == 0)
return (keywords[i].kval);
s[2] = '\0';
for (i = 0; i < KEY_LEN; i++)
if (strcmp(keywords[i].name, s) == 0)
return (keywords[i].kval);
return 0; /* 0 ==> not found */
}
|
