117 lines
3.2 KiB
C
117 lines
3.2 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@gmail.com>
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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, provided that the above
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* copyright notice and this permission notice appear in all copies.
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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 context *ctx, struct item *program) {
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struct item *result = NULL;
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(void) execute (ctx, program, &result);
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item_free_list (program);
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const char *failure = ctx->error;
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if (ctx->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 (ctx->error);
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ctx->error = NULL;
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ctx->memory_failure = false;
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} else {
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print_item_list (result);
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putchar ('\n');
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item_free_list (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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struct context ctx;
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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 item *item = ctx.variables; item; item = item->next)
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if (n < 127 && !strncmp (item->head->value, text, len))
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buf[n++] = format ("%s", item->head->value);
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for (struct native_fn *iter = ctx.native; iter; iter = iter->next)
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if (n < 127 && !strncmp (iter->name, text, len))
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buf[n++] = 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] = 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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context_init (&ctx);
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if (!init_runtime_library (&ctx))
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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 parser parser;
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parser_init (&parser, line, strlen (line));
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add_history (line);
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const char *e = NULL;
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struct item *program = parser_run (&parser, &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 (&ctx, program);
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parser_free (&parser);
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}
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putchar ('\n');
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context_free (&ctx);
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return 0;
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}
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