1 files changed, 18 insertions, 8 deletions
diff --git a/lisp.h b/lisp.h
index 6ebf9a2..a43f750 100644
--- a/lisp.h
+++ b/lisp.h
@@ -1,16 +1,19 @@
 #ifndef LISP_H
 #define LISP_H
 
+typedef struct value value;
+typedef struct env env;
+
 typedef enum {
-	VALTYPE_INT,
-	VALTYPE_DOUBLE,
-	VALTYPE_SYMBOL,
-	VALTYPE_STRING,
-	VALTYPE_NIL,
-	VALTYPE_PAIR
+	VT_INT,
+	VT_DOUBLE,
+	VT_SYMBOL,
+	VT_STRING,
+	VT_NIL,
+	VT_PAIR,
+	VT_LAMBDA
 } val_type;
 
-typedef struct value value;
 struct value {
 	val_type type;
 	union {
@@ -22,6 +25,11 @@ struct value {
 			value *car;
 			value *cdr;
 		} pair;
+		struct {
+			value *params;
+			value *body;
+			env *env;
+		} lambda;
 	} as;
 };
 
@@ -30,6 +38,7 @@ value *make_double(double d);
 value *make_symbol(const char *sym);
 value *make_string(const char *str);
 value *make_nil();
+value *make_lambda(env *e, value *params, value *body);
 value *cons(value *car, value *cdr);
 value *car(value *cons);
 value *cdr(value *cons);
@@ -37,7 +46,6 @@ value *cdr(value *cons);
 void *print_value(value *val);
 // environments, TODO: make this use hashtable
 // symbol->val
-typedef struct env env;
 typedef struct env {
 	const char *symbol;
 	value *value;
@@ -54,4 +62,6 @@ extern env *global_env;
 value *eval(env *e, value *val);
 value *eval_pair(env *e, value *val);
 
+value *apply(value *lambda, value *args);
+
 #endif