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
|
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lexer.h"
#include "common.h"
#include "error.h"
#include "logic.h"
#include "gate.h"
static FILE* fd;
static struct token *cursor;
static const char *filename;
/* FIXME change to varadic fuction */
#define emit(...) \
if (cursor) { \
fprintf(stderr, "%s at (%zd,%zd): ", filename, cursor->loc.line, cursor->loc.column); \
fprintf(stderr, __VA_ARGS__); \
indicate_file_area(fd, cursor->loc.line, cursor->loc.column - cursor->loc.leading_whitespace_len, cursor->span); \
} else { \
fprintf(stderr, "%s: ", filename); \
fprintf(stderr, __VA_ARGS__); \
}
//static struct op_lookup uop_handlers[] = {
// {.str = "not", .handler = logic_nand},
//};
//
//static struct op_lookup bop_handlers[] = {
// {.str = "and", .handler = logic_and},
// {.str = "or", .handler = logic_or},
// {.str = "nand", .handler = logic_nand},
// {.str = "nor", .handler = logic_nor},
// {.str = "xor", .handler = logic_xor}
//};
//
//static struct tok_lookup tok_handlers[] = {
// {.str = "input", .handler = parse_input},
// {.str = "module", .handler = parse_module},
// {.str = "expr", .handler = parse_expr}
//};
static int
expect(enum TOKEN_TYPE e) {
char *expected_desc = "(internal error)";
char *observed_desc = "(internal error)";
if (!cursor || cursor->type != e) {
expected_desc = get_token_description(e);
if (cursor) {
observed_desc = get_token_description(cursor->type);
} else {
observed_desc = "end of file";
}
emit("Error: Expected %s, got %s\n", expected_desc, observed_desc);
return 1;
}
return 0;
}
static void
kerchunk() {
if (cursor) {
cursor = cursor->next;
}
}
int
parse(const char *fname, FILE *f, struct token *t) {
char *token_desc = "(internal error)";
fd = f;
filename = fname;
cursor = t;
/* Eat leading EOL tokens */
while (cursor && cursor->type == TOK_EOL) {
kerchunk();
}
if (expect(TOK_MODULE)) {
return 1;
}
kerchunk();
if (expect(TOK_IDENT)) {
return 1;
}
emit("Debug: module is named %s\n", cursor->value);
kerchunk();
if (expect(TOK_EOL)) {
return 1;
}
kerchunk();
while (cursor) {
switch(cursor->type) {
case TOK_EOL:
kerchunk();
break;
/* FIXME implement everything */
default:
token_desc = get_token_description(cursor->type);
emit("Error: Unexpected %s\n", token_desc);
return 1;
}
}
return 0;
}
|