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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Stichting Mathematisch
Centrum or CWI not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
******************************************************************/
/* Parser generator main program */
/* This expects a filename containing the grammar as argv[1] (UNIX)
or asks the console for such a file name (THINK C).
It writes its output on two files in the current directory:
- "graminit.c" gets the grammar as a bunch of initialized data
- "graminit.h" gets the grammar's non-terminals as #defines.
Error messages and status info during the generation process are
written to stdout, or sometimes to stderr. */
/* XXX TO DO:
- check for duplicate definitions of names (instead of fatal err)
*/
#include "pgenheaders.h"
#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "pgen.h"
int debugging;
/* Forward */
grammar *getgrammar PROTO((char *filename));
#ifdef THINK_C
int main PROTO((int, char **));
char *askfile PROTO((void));
#endif
void
goaway(sts)
int sts;
{
exit(sts);
}
int
main(argc, argv)
int argc;
char **argv;
{
grammar *g;
FILE *fp;
char *filename;
#ifdef THINK_C
filename = askfile();
#else
if (argc != 2) {
fprintf(stderr, "usage: %s grammar\n", argv[0]);
goaway(2);
}
filename = argv[1];
#endif
g = getgrammar(filename);
fp = fopen("graminit.c", "w");
if (fp == NULL) {
perror("graminit.c");
goaway(1);
}
printf("Writing graminit.c ...\n");
printgrammar(g, fp);
fclose(fp);
fp = fopen("graminit.h", "w");
if (fp == NULL) {
perror("graminit.h");
goaway(1);
}
printf("Writing graminit.h ...\n");
printnonterminals(g, fp);
fclose(fp);
goaway(0);
}
grammar *
getgrammar(filename)
char *filename;
{
FILE *fp;
node *n;
grammar *g0, *g;
perrdetail err;
fp = fopen(filename, "r");
if (fp == NULL) {
perror(filename);
goaway(1);
}
g0 = meta_grammar();
n = parsefile(fp, filename, g0, g0->g_start,
(char *)NULL, (char *)NULL, &err);
fclose(fp);
if (n == NULL) {
fprintf(stderr, "Parsing error %d, line %d.\n",
err.error, err.lineno);
if (err.text != NULL) {
int i;
fprintf(stderr, "%s", err.text);
i = strlen(err.text);
if (i == 0 || err.text[i-1] != '\n')
fprintf(stderr, "\n");
for (i = 0; i < err.offset; i++) {
if (err.text[i] == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
free(err.text);
}
goaway(1);
}
g = pgen(n);
if (g == NULL) {
printf("Bad grammar.\n");
goaway(1);
}
return g;
}
#ifdef THINK_C
char *
askfile()
{
char buf[256];
static char name[256];
printf("Input file name: ");
if (fgets(buf, sizeof buf, stdin) == NULL) {
printf("EOF\n");
goaway(1);
}
/* XXX The (unsigned char *) case is needed by THINK C 3.0 */
if (sscanf(/*(unsigned char *)*/buf, " %s ", name) != 1) {
printf("No file\n");
goaway(1);
}
return name;
}
#endif
void
fatal(msg)
char *msg;
{
fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
goaway(1);
}
#ifdef macintosh
/* ARGSUSED */
int
guesstabsize(path)
char *path;
{
return 4;
}
#endif
/* No-nonsense my_readline() for tokenizer.c */
char *
my_readline(prompt)
char *prompt;
{
int n = 1000;
char *p = malloc(n);
char *q;
if (p == NULL)
return NULL;
fprintf(stderr, "%s", prompt);
q = fgets(p, n, stdin);
if (q == NULL) {
*p = '\0';
return p;
}
n = strlen(p);
if (n > 0 && p[n-1] != '\n')
p[n-1] = '\n';
return realloc(p, n+1);
}
|
