Split out the interpreter

interpreter.c

@@ -0,0 +1,71 @@
+/*
+ * interpreter.c: test interpreter
+ *
+ * Copyright (c) 2017, Přemysl Janouch <p.janouch@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * 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"
+
+int
+main (int argc, char *argv[]) {
+	FILE *fp = stdin;
+	if (argc > 1 && !(fp = fopen (argv[1], "rb"))) {
+		fprintf (stderr, "%s: %s\n", argv[1], strerror (errno));
+		return 1;
+	}
+
+	int c;
+	struct buffer buf = BUFFER_INITIALIZER;
+	while ((c = fgetc (fp)) != EOF)
+		buffer_append_c (&buf, c);
+	buffer_append_c (&buf, 0);
+	fclose (fp);
+
+	struct parser parser;
+	parser_init (&parser, buf.s, buf.len - 1);
+	const char *e = NULL;
+	struct item *program = parser_run (&parser, &e);
+#ifndef NDEBUG
+	printf ("\x1b[1m%s\x1b[0m\n", buf.s);
+	print_tree (program, 0);
+	printf ("\n\n");
+#endif
+	free (buf.s);
+	if (e) {
+		printf ("%s: %s\n", "parse error", e);
+		return 1;
+	}
+	parser_free (&parser);
+
+	struct context ctx;
+	context_init (&ctx);
+	if (!init_runtime_library (&ctx))
+		printf ("%s\n", "runtime library initialization failed");
+
+	struct item *result = NULL;
+	(void) execute (&ctx, program, &result);
+	item_free_list (result);
+	item_free_list (program);
+
+	const char *failure = ctx.error;
+	if (ctx.memory_failure)
+		failure = "memory allocation failure";
+	if (failure)
+		printf ("%s: %s\n", "runtime error", failure);
+	context_free (&ctx);
+	return 0;
+}
+