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