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#include "im.h"
#include "dbg.h"
#include "errloc.h"
#include "fn.h"
#include "prv.h"
#include "parse.h"
#include "sym.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void im_free(struct im *im)
{
ast_free(&im->ast);
lex_free(&im->l);
}
static FILE *tryinc(const char *dir, const char *path, char **fullpath)
{
FILE *ret = NULL;
size_t n = strlen(dir) + strlen(path) + 2;
char *fp = malloc(n);
if (!fp)
{
perror("malloc(3)");
goto end;
}
else if (snprintf(fp, n, "%s/%s", dir, path) < 0)
{
fprintf(stderr, "%s: snprintf(3) failed\n", __func__);
goto end;
}
else if ((ret = fopen(fp, "rb")))
*fullpath = fp;
end:
if (!ret)
free(fp);
return ret;
}
static char *fpath(const char *cur, const char *path)
{
const char *sl = strrchr(cur, '/');
char *ret;
/* '/' + '\0' */
size_t n = 2;
int curlen;
if (!sl)
{
cur = ".";
curlen = 1;
}
else
curlen = sl - cur;
n += curlen + strlen(path);
if ((ret = malloc(n)))
snprintf(ret, n, "%.*s/%s", curlen, cur, path);
else
perror("malloc(3)");
return ret;
}
static int doim(const struct lex *l, const struct tk *tk, struct prv *p)
{
int ret = -1;
FILE *f = NULL;
struct im *im;
struct fn *fn = fn_cur(p), *fns = NULL;
struct ast *ast;
const char *path = tk->s;
size_t n = fn->nimps + 1;
char *fp = NULL, *incfp;
const struct loc *loc = &tk->loc;
/* TODO: no protection against recursive imports */
if (!(fp = fpath(l->loc.f, path)))
goto end;
else if (!(f = fopen(fp, "rb")))
{
const struct arg_input *incs = &l->args->incs;
for (size_t i = 0; i < incs->n; i++)
if ((f = tryinc(incs->v[i], path, &incfp)))
{
free(fp);
fp = incfp;
break;
}
}
if (!f)
{
errloc(tk, "failed to open import \"%s\"", path);
goto end;
}
else if (!(fns = malloc(sizeof *fns)))
{
perror("malloc(3)");
goto end;
}
*fns = (struct fn){.tk = tk};
if (!(im = realloc(fn->imps, n * sizeof *im)))
{
perror("realloc(3)");
goto end;
}
fn->imps = im;
im = &fn->imps[fn->nimps++];
*im = (struct im){.l = {.loc.f = fp, .args = l->args}};
ast = &im->ast;
ast->fns = fns;
/* hack: treat imports as a function */
ast->nfns = 1;
fp = NULL;
dbg("start import %s (from %s:%d:%d)\n", im->l.loc.f, loc->f, loc->line,
loc->col);
if (lex(&im->l, f) || parse_im(&im->l, ast))
goto end;
dbg("end import %s\n", im->l.loc.f);
ret = 0;
end:
if (ret)
free(fp);
if (f && fclose(f))
{
fprintf(stderr, "fclose(3) %s: %s\n", path, strerror(errno));
ret = -1;
}
return ret;
}
static int onsym(const struct lex *l, struct prv *p, const struct sym *s)
{
if (s->type != SYM_LIT)
{
errloc(s->tk, "expected literal");
return -1;
}
return doim(l, s->tk, p);
}
int im(const struct lex *l, struct prv *p)
{
struct fn *fn = fn_cur(p);
if (fn->im)
{
const struct loc *loc = &fn->im->loc;
errloc(p->stk, "imports section already defined at %s:%d:%d",
loc->f, loc->line, loc->col);
return -1;
}
fn->im = p->stk;
p->stk = p->tk;
return sym(p, onsym);
}
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