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
|
/* Parser-tokenizer link implementation */
#include <stdio.h>
#include "PROTO.h"
#include "malloc.h"
#include "tokenizer.h"
#include "node.h"
#include "grammar.h"
#include "parser.h"
#include "errcode.h"
extern int debugging;
/* Parse input coming from the given tokenizer structure.
Return error code. */
static int
parsetok(tok, g, start, n_ret)
struct tok_state *tok;
grammar *g;
int start;
node **n_ret;
{
parser_state *ps;
int ret;
if ((ps = newparser(g, start)) == NULL) {
fprintf(stderr, "no mem for new parser\n");
return E_NOMEM;
}
for (;;) {
char *a, *b;
int type;
int len;
char *str;
type = tok_get(tok, &a, &b);
if (type == ERRORTOKEN) {
ret = tok->done;
break;
}
len = b - a;
str = NEW(char, len + 1);
if (str == NULL) {
fprintf(stderr, "no mem for next token\n");
ret = E_NOMEM;
break;
}
strncpy(str, a, len);
str[len] = '\0';
ret = addtoken(ps, (int)type, str);
if (ret != E_OK) {
if (ret == E_DONE) {
*n_ret = ps->p_tree;
ps->p_tree = NULL;
}
else if (tok->lineno <= 1 && tok->done == E_EOF)
ret = E_EOF;
break;
}
}
delparser(ps);
return ret;
}
/* Parse input coming from a string. Return error code. */
int
parsestring(s, g, start, n_ret)
char *s;
grammar *g;
int start;
node **n_ret;
{
struct tok_state *tok = tok_setups(s);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setups\n");
return E_NOMEM;
}
ret = parsetok(tok, g, start, n_ret);
if (ret == E_TOKEN || ret == E_SYNTAX) {
fprintf(stderr, "String parsing error at line %d\n",
tok->lineno);
}
tok_free(tok);
return ret;
}
/* Parse input coming from a file. Return error code. */
int
parsefile(fp, g, start, ps1, ps2, n_ret)
FILE *fp;
grammar *g;
int start;
char *ps1, *ps2;
node **n_ret;
{
struct tok_state *tok = tok_setupf(fp, ps1, ps2);
int ret;
if (tok == NULL) {
fprintf(stderr, "no mem for tok_setupf\n");
return E_NOMEM;
}
ret = parsetok(tok, g, start, n_ret);
if (ret == E_TOKEN || ret == E_SYNTAX) {
char *p;
fprintf(stderr, "Parsing error at line %d:\n", tok->lineno);
*tok->inp = '\0';
if (tok->inp > tok->buf && tok->inp[-1] == '\n')
tok->inp[-1] = '\0';
fprintf(stderr, "%s\n", tok->buf);
for (p = tok->buf; p < tok->cur; p++) {
if (*p == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
}
tok_free(tok);
return ret;
}
|
