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
|
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <ct/compiler.h>
#include <ct/string.h>
#include <ct/debug.h>
#include <ct/path.h>
#include <ct/res.h>
static int read_element(FILE *f, struct string *element)
{
if (feof(f))
return -1;
str_clear(element);
char c = fgetc(f);
str_append(element, c);
if (!isalnum(c))
return 0;
while ((c = fgetc(f))) {
if (isalnum(c)) {
str_append(element, c);
} else {
ungetc(c, f);
break;
}
}
return 0;
}
static struct string *read_block(FILE *f, size_t *lines)
{
size_t depth = 0;
bool maybe_statement = true;
struct string *block = new_string(NULL);
if (!block)
return NULL;
struct string *elem = new_string(NULL);
if (!elem) {
destroy_string(block);
return NULL;
}
size_t newlines = 0;
while (1) {
if (read_element(f, elem)) {
destroy_string(elem);
destroy_string(block);
return NULL;
}
if (maybe_statement && str_compare(elem, ";")) {
str_add(block, elem);
break;
}
if (str_compare(elem, "{")) {
maybe_statement = false;
depth += 1;
}
if (str_compare(elem, "}"))
depth -= 1;
str_add(block, elem);
if (str_compare(elem, "\n"))
newlines++;
if (!maybe_statement && depth == 0)
break;
}
if (lines)
*lines += newlines;
destroy_string(elem);
return block;
}
static int process(struct res *r, const char *file)
{
FILE *f = fopen(file, "r");
if (!f) {
error("failed opening %s: %s\n", file, strerror(errno));
return -1;
}
size_t lines = 1, prev_lines = 1;
struct string *block;
while ((block = read_block(f, &lines))) {
debug("block: (%zu - %zu, %zu)\n%s\n", prev_lines, lines,
lines - prev_lines, block->buf);
prev_lines = lines + 1;
/* with each block,
* A) Detect if it is an import block and what kind,
* in which case process the file that it refers to.
*
* B) Detect if it is a macro block and what kind, in which case
* parse it and add it to the macro subsystem.
*
* C) Run the preprocessor on the block.
*
* D) Actually lex/parse/generate AST for the block.
*
* E) Run semantic checks on the block.
*
* With all of these parts checked, I'm pretty sure we can
* directly generate code for each block. Possibly something
* like one C file per CT file, will have to look into what
* might be easiest. Also, some internal duplicate checking, so
* that we don't accidentally generate the same generic function
* in two different files or something like that.
*
* Same duplicate checking could be useful for the interpreted
* approach.
*
* Step D) could potentially be done on request, maybe fitting
* for the interpreted approach, I guess it depends on how fast the
* lexing/parsing/AST generation for each block is. Semantic
* checking is what I suspect will be the slowest part.
*
* Oh yeah, need some way to push result of some lower file
* processing upwards. And probably detecting a main block as
* well?
*/
destroy_string(block);
}
fclose(f);
return 0;
}
void compile(const char *file) {
struct res *r = res_create();
res_add(r, (void *)(file = strdup(file)));
const char *base = ct_basename(file);
res_add(r, (void *)base);
if (!base)
goto out;
const char *dir = ct_dirname(file);
res_add(r, (void *)dir);
if (!dir)
goto out;
const char *cwd = ct_cwdname();
res_add(r, (void *)cwd);
if (!cwd)
goto out;
debug("(cwd:%s)(dir:%s)(base:%s)\n", cwd, dir, base);
if (chdir(dir)) {
error("couldn't change to directory %s: %s\n", dir, strerror(errno));
goto out;
}
if (process(r, base))
goto out;
if (chdir(cwd)) {
error("couldn't change back to directory %s: %s\n", cwd, strerror(errno));
goto out;
}
out:
res_destroy(r);
}
|
