1 files changed, 102 insertions, 0 deletions
diff --git a/src/lisp/ao_lisp_error.c b/src/lisp/ao_lisp_error.c
new file mode 100644
index 00000000..54a9be10
--- /dev/null
+++ b/src/lisp/ao_lisp_error.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao_lisp.h"
+#include <stdarg.h>
+
+void
+ao_lisp_error_poly(char *name, ao_poly poly, ao_poly last)
+{
+	int first = 1;
+	printf("\t\t%s(", name);
+	if (ao_lisp_poly_type(poly) == AO_LISP_CONS) {
+		if (poly) {
+			while (poly) {
+				struct ao_lisp_cons *cons = ao_lisp_poly_cons(poly);
+				if (!first)
+					printf("\t\t         ");
+				else
+					first = 0;
+				ao_lisp_poly_print(cons->car);
+				printf("\n");
+				if (poly == last)
+					break;
+				poly = cons->cdr;
+			}
+			printf("\t\t         )\n");
+		} else
+			printf(")\n");
+	} else {
+		ao_lisp_poly_print(poly);
+		printf("\n");
+	}
+}
+
+static void tabs(int indent)
+{
+	while (indent--)
+		printf("\t");
+}
+
+void
+ao_lisp_error_frame(int indent, char *name, struct ao_lisp_frame *frame)
+{
+	int			f;
+
+	tabs(indent);
+	printf ("%s{", name);
+	if (frame) {
+		if (frame->type & AO_LISP_FRAME_PRINT)
+			printf("recurse...");
+		else {
+			frame->type |= AO_LISP_FRAME_PRINT;
+			for (f = 0; f < frame->num; f++) {
+				if (f != 0) {
+					tabs(indent);
+					printf("         ");
+				}
+				ao_lisp_poly_print(frame->vals[f].atom);
+				printf(" = ");
+				ao_lisp_poly_print(frame->vals[f].val);
+				printf("\n");
+			}
+			if (frame->prev)
+				ao_lisp_error_frame(indent + 1, "prev:   ", ao_lisp_poly_frame(frame->prev));
+			frame->type &= ~AO_LISP_FRAME_PRINT;
+		}
+		tabs(indent);
+		printf("        }\n");
+	} else
+		printf ("}\n");
+}
+
+
+ao_poly
+ao_lisp_error(int error, char *format, ...)
+{
+	va_list	args;
+
+	ao_lisp_exception |= error;
+	va_start(args, format);
+	vprintf(format, args);
+	va_end(args);
+	printf("\n");
+	printf("Value: "); ao_lisp_poly_print(ao_lisp_v); printf("\n");
+	printf("Stack:\n");
+	ao_lisp_stack_print(ao_lisp_stack_poly(ao_lisp_stack));
+	printf("Globals:\n\t");
+	ao_lisp_frame_print(ao_lisp_frame_poly(ao_lisp_frame_global));
+	printf("\n");
+	return AO_LISP_NIL;
+}