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#include "im.h"
#include "errloc.h"
#include "fn.h"
#include "prv.h"
#include "parse.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int imlit(const struct lex *, struct prv *);
static const struct seq seqs[] =
{
{(struct step[]){{LIT, NULL, 1}, {0}}, .fn = imlit},
{0}
};
void im_free(struct im *im)
{
ast_free(&im->ast);
lex_free(&im->l);
}
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);
struct ast *ast;
size_t n = fn->nimps + 1;
const char *path = tk->s;
if (!strcmp(l->loc.f, path))
{
errloc(tk, "detected recursive import \"%s\"", path);
goto end;
}
/* TODO: honor -I flags */
if (!(f = fopen(path, "rb")))
{
errloc(tk, "failed to open import \"%s\": %s", path, strerror(errno));
goto end;
}
else 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 = path};
ast = &im->ast;
if (!(ast->fns = malloc(sizeof *ast->fns)))
{
perror("malloc(3)");
goto end;
}
*ast->fns = (struct fn){.tk = tk};
/* hack: treat imports as a function */
ast->nfns = 1;
if (lex(&im->l, f) || parse_im(&im->l, ast))
goto end;
ret = 0;
end:
if (f && fclose(f))
{
fprintf(stderr, "fclose(3) %s: %s\n", path, strerror(errno));
ret = -1;
}
return ret;
}
static int imlit(const struct lex *l, struct prv *p)
{
const struct tk *tk = p->stk;
while (!lex_eof(l, tk) && !kw(tk->s))
if (doim(l, tk++, p))
return -1;
if (pop(l, p))
return -1;
p->stk = p->tk;
return 1;
}
int im(const struct lex *l, struct prv *p)
{
struct pos init =
{
.seq = seqs,
.stseq = seqs,
.step = seqs->steps
};
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;
}
if (push(&init, p))
return -1;
fn->im = p->stk;
p->stk = p->tk;
return 1;
}
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