1 files changed, 37 insertions, 0 deletions
diff --git a/lisp.h b/lisp.h
new file mode 100644
index 0000000..535bc50
--- /dev/null
+++ b/lisp.h
@@ -0,0 +1,37 @@
+#ifndef LISP_H
+#define LISP_H
+
+typedef enum {
+	VALTYPE_INT,
+	VALTYPE_DOUBLE,
+	VALTYPE_SYMBOL,
+	VALTYPE_STRING,
+	VALTYPE_NIL,
+	VALTYPE_PAIR
+} val_type;
+
+typedef struct value value;
+struct value {
+	val_type type;
+	union {
+		int i;
+		double d;
+		const char *sym;
+		const char *str;
+		struct {
+			value *car;
+			value *cdr;
+		} pair;
+	} as;
+};
+
+value *make_int(int i);
+value *make_double(double d);
+value *make_symbol(const char *sym);
+value *make_string(const char *str);
+value *make_nil();
+value *cons(value *car, value *cdr);
+
+void *print_val(value *val);
+
+#endif