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
|
/* 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)
*/
#define PGEN
#include "Python.h"
#include "internal/mem.h"
#include "internal/pystate.h"
#include "pgenheaders.h"
#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "pgen.h"
int Py_DebugFlag;
int Py_VerboseFlag;
int Py_IgnoreEnvironmentFlag;
_PyRuntimeState _PyRuntime = {0, 0};
/* Forward */
grammar *getgrammar(const char *filename);
void Py_Exit(int) _Py_NO_RETURN;
void
Py_Exit(int sts)
{
exit(sts);
}
/* Needed by obmalloc.c */
int PyGILState_Check(void)
{ return 1; }
void _PyMem_DumpTraceback(int fd, const void *ptr)
{}
int
main(int argc, char **argv)
{
grammar *g;
FILE *fp;
char *filename, *graminit_h, *graminit_c;
if (argc != 4) {
fprintf(stderr,
"usage: %s grammar graminit.h graminit.c\n", argv[0]);
Py_Exit(2);
}
filename = argv[1];
graminit_h = argv[2];
graminit_c = argv[3];
_PyObject_Initialize(&_PyRuntime.obj);
_PyMem_Initialize(&_PyRuntime.mem);
g = getgrammar(filename);
fp = fopen(graminit_c, "w");
if (fp == NULL) {
perror(graminit_c);
Py_Exit(1);
}
if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_c);
printgrammar(g, fp);
fclose(fp);
fp = fopen(graminit_h, "w");
if (fp == NULL) {
perror(graminit_h);
Py_Exit(1);
}
if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_h);
printnonterminals(g, fp);
fclose(fp);
freegrammar(g);
Py_Exit(0);
return 0; /* Make gcc -Wall happy */
}
grammar *
getgrammar(const char *filename)
{
FILE *fp;
node *n;
grammar *g0, *g;
perrdetail err;
fp = fopen(filename, "r");
if (fp == NULL) {
perror(filename);
Py_Exit(1);
}
g0 = meta_grammar();
n = PyParser_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) {
size_t len;
int i;
fprintf(stderr, "%s", err.text);
len = strlen(err.text);
if (len == 0 || err.text[len-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");
PyObject_FREE(err.text);
}
Py_Exit(1);
}
g = pgen(n);
PyNode_Free(n);
if (g == NULL) {
printf("Bad grammar.\n");
Py_Exit(1);
}
return g;
}
/* Can't happen in pgen */
PyObject*
PyErr_Occurred()
{
return 0;
}
void
Py_FatalError(const char *msg)
{
fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
Py_Exit(1);
}
/* No-nonsense my_readline() for tokenizer.c */
char *
PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
{
size_t n = 1000;
char *p = (char *)PyMem_MALLOC(n);
char *q;
if (p == NULL)
return NULL;
fprintf(stderr, "%s", prompt);
q = fgets(p, n, sys_stdin);
if (q == NULL) {
*p = '\0';
return p;
}
n = strlen(p);
if (n > 0 && p[n-1] != '\n')
p[n-1] = '\n';
return (char *)PyMem_REALLOC(p, n+1);
}
/* No-nonsense fgets */
char *
Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
{
return fgets(buf, n, stream);
}
#include <stdarg.h>
void
PySys_WriteStderr(const char *format, ...)
{
va_list va;
va_start(va, format);
vfprintf(stderr, format, va);
va_end(va);
}
|
