cell_t *sexp_parse(secd_t *secd, cell_t *port) {
cell_t *prevport = SECD_NIL;
if (not_nil(port)) {
assert(cell_type(port) == CELL_PORT, "sexp_parse: not a port");
prevport = secd->input_port; // share_cell, drop_cell
secd->input_port = share_cell(secd, port);
}
secd_parser_t p;
init_parser(secd, &p);
cell_t *res = sexp_read(secd, &p);
if (not_nil(prevport)) {
secd->input_port = prevport; //share_cell back
drop_cell(secd, port);
}
return res;
}
static void repl (sexp ctx, sexp env) {
sexp_gc_var6(obj, tmp, res, in, out, err);
sexp_gc_preserve6(ctx, obj, tmp, res, in, out, err);
sexp_context_tracep(ctx) = 1;
in = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_IN_SYMBOL));
out = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_OUT_SYMBOL));
err = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_ERR_SYMBOL));
if (in == NULL || out == NULL) {
fprintf(stderr, "Standard I/O ports not found, aborting. Maybe a bad -x language?\n");
exit_failure();
}
if (err == NULL) err = out;
sexp_port_sourcep(in) = 1;
while (1) {
sexp_write_string(ctx, "> ", out);
sexp_flush(ctx, out);
sexp_maybe_block_port(ctx, in, 1);
obj = sexp_read(ctx, in);
sexp_maybe_unblock_port(ctx, in);
if (obj == SEXP_EOF)
break;
if (sexp_exceptionp(obj)) {
sexp_print_exception(ctx, obj, err);
} else {
sexp_context_top(ctx) = 0;
if (!(sexp_idp(obj)||sexp_pairp(obj)||sexp_nullp(obj)))
obj = sexp_make_lit(ctx, obj);
tmp = sexp_env_bindings(env);
res = sexp_eval(ctx, obj, env);
#if SEXP_USE_WARN_UNDEFS
sexp_warn_undefs(ctx, sexp_env_bindings(env), tmp, res);
#endif
if (res && sexp_exceptionp(res)) {
sexp_print_exception(ctx, res, err);
if (res != sexp_global(ctx, SEXP_G_OOS_ERROR))
sexp_stack_trace(ctx, err);
} else if (res != SEXP_VOID) {
sexp_write(ctx, res, out);
sexp_write_char(ctx, '\n', out);
}
}
}
sexp_gc_release6(ctx);
}
static void repl (sexp ctx, sexp env) {
sexp in, out, err;
sexp_gc_var3(obj, tmp, res);
sexp_gc_preserve3(ctx, obj, tmp, res);
sexp_context_tracep(ctx) = 1;
in = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_IN_SYMBOL));
out = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_OUT_SYMBOL));
err = sexp_param_ref(ctx, env, sexp_global(ctx, SEXP_G_CUR_ERR_SYMBOL));
sexp_port_sourcep(in) = 1;
while (1) {
sexp_write_string(ctx, "> ", out);
sexp_flush(ctx, out);
sexp_maybe_block_port(ctx, in, 1);
obj = sexp_read(ctx, in);
sexp_maybe_unblock_port(ctx, in);
if (obj == SEXP_EOF)
break;
if (sexp_exceptionp(obj)) {
sexp_print_exception(ctx, obj, err);
} else {
tmp = sexp_env_bindings(env);
sexp_context_top(ctx) = 0;
res = sexp_eval(ctx, obj, env);
if (sexp_exceptionp(res)) {
sexp_print_exception(ctx, res, err);
sexp_stack_trace(ctx, err);
} else {
#if SEXP_USE_WARN_UNDEFS
sexp_warn_undefs(ctx, sexp_env_bindings(env), tmp);
#endif
if (res != SEXP_VOID) {
sexp_write(ctx, res, out);
sexp_write_char(ctx, '\n', out);
}
}
}
}
sexp_gc_release3(ctx);
}
static cell_t *read_token(secd_t *secd, secd_parser_t *p) {
int tok;
cell_t *inp = NULL;
switch (tok = p->token) {
case '(':
++p->nested;
inp = read_list(secd, p);
if (p->token != ')')
goto error_exit;
return inp;
case TOK_NUM:
return new_number(secd, p->numtok);
case TOK_CHAR:
return new_char(secd, p->numtok);
case TOK_SYM:
return new_symbol(secd, p->symtok);
case TOK_STR:
inp = new_string(secd, strmem(p->strtok));
drop_cell(secd, p->strtok);
return inp;
case TOK_EOF:
return new_symbol(secd, EOF_OBJ);
case TOK_QUOTE: case TOK_QQ:
case TOK_UQ: case TOK_UQSPL: {
const char *formname = special_form_for(tok);
assert(formname, "No special form for token=%d\n", tok);
inp = sexp_read(secd, p);
assert_cell(inp, "sexp_read: reading subexpression failed");
return new_cons(secd, new_symbol(secd, formname),
new_cons(secd, inp, SECD_NIL));
}
case '#':
switch (tok = lexnext(p)) {
case '(': {
cell_t *tmplist = read_list(secd, p);
if (p->token != ')') {
free_cell(secd, tmplist);
goto error_exit;
}
inp = list_to_vector(secd, tmplist);
free_cell(secd, tmplist);
return inp;
}
case TOK_SYM: {
if (p->symtok[0] == '.') {
int op = secdop_by_name(p->symtok + 1);
if (op < 0)
goto error_exit;
return new_op(secd, op);
}
if (str_eq(p->symtok, "u8")) {
lexnext(p);
inp = read_bytevector(p);
if (p->token != ')')
goto error_exit;
return inp;
}
}
}
errorf("Unknown suffix for #\n");
}
error_exit:
if (inp) free_cell(secd, inp);
errorf("read_token: failed\n");
return new_error(secd, SECD_NIL,
"read_token: failed on token %1$d '%1$c'", p->token);
}