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/*
* repl.c: test REPL
*
* Copyright (c) 2017, Přemysl Janouch <p@janouch.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "ell.c"
#include <readline/readline.h>
#include <readline/history.h>
static void
run (struct ell *ell, struct ell_v *program) {
struct ell_v *result = NULL;
(void) ell_eval_block (ell, program, NULL, &result);
ell_free_seq (program);
const char *failure = ell->error;
if (ell->memory_failure)
failure = "memory allocation failure";
if (failure) {
printf ("\x1b[31m%s: %s\x1b[0m\n", "runtime error", failure);
free (ell->error);
ell->error = NULL;
ell->memory_failure = false;
} else {
ell_print_seq (&ell_stdout_printer, result);
putchar ('\n');
ell_free_seq (result);
}
}
static int
init_readline (void) {
rl_variable_bind ("blink-matching-paren", "on");
rl_bind_key (TAB, rl_named_function ("possible-completions"));
return 0;
}
static struct ell ell;
static char **
complete (const char *text, int start, int end) {
(void) start;
(void) end;
// Don't iterate over filenames and stuff
rl_attempted_completion_over = true;
static char *buf[128];
size_t n = 1, len = strlen (text);
for (struct ell_v *v = ell.globals; v; v = v->next)
if (n < 127 && !strncmp (v->head->string, text, len))
buf[n++] = ell_format ("%s", v->head->string);
for (struct ell_native_fn *iter = ell.native; iter; iter = iter->next)
if (n < 127 && !strncmp (iter->name, text, len))
buf[n++] = ell_format ("%s", iter->name);
if (n < 2)
return NULL;
// This never actually completes anything, just shows the options,
// we'd have to figure out the longest common prefix
buf[0] = ell_format ("%s", text);
buf[n++] = NULL;
char **copy = malloc (sizeof *buf * n);
memcpy (copy, buf, sizeof *buf * n);
return copy;
}
int
main (int argc, char *argv[]) {
(void) argc;
ell = ell_make ();
if (!ell_std_initialize (&ell))
printf ("%s\n", "runtime library initialization failed");
using_history ();
const char *slash = strrchr (argv[0], '/');
rl_readline_name = slash ? ++slash : argv[0];
rl_startup_hook = init_readline;
rl_attempted_completion_function = complete;
char *line;
while ((line = readline ("> "))) {
struct ell_parser p = ell_parser_make (line, strlen (line));
add_history (line);
const char *e = NULL;
struct ell_v *program = ell_parser_run (&p, &e);
free (line);
if (e)
printf ("\x1b[31m%s: %s\x1b[0m\n", "parse error", e);
else
run (&ell, program);
ell_parser_free (&p);
}
putchar ('\n');
ell_free (&ell);
return 0;
}
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