1 files changed, 66 insertions, 0 deletions
diff --git a/src/value.h b/src/value.h
new file mode 100644
index 0000000..c2f43e3
--- /dev/null
+++ b/src/value.h
@@ -0,0 +1,66 @@
+#ifndef VALUE_H
+#define VALUE_H
+
+#include "lexer.h"
+#include "env.h"
+
+typedef struct value * value_t;
+#define VALUE_EMPTY NULL
+
+typedef value_t (*builtin_proc_t)(value_t *args);
+
+#define VALUE_TYPES(X)         \
+    X(VALUE_NIL)               \
+    X(VALUE_ATOM)              \
+    X(VALUE_STR)               \
+    X(VALUE_INT)               \
+    X(VALUE_CONS)              \
+    X(VALUE_PROC)              \
+    X(VALUE_PROC_BUILTIN)      
+
+#define TO_ENUM(type) type,
+#define TO_STRING(type) #type,
+
+extern const char * const value_type_string[];
+        
+struct value {
+    enum value_type {
+        VALUE_TYPES(TO_ENUM)
+    } type;
+
+    union value_union {
+        char *atom;
+        char *str;
+        int   num;
+
+        struct cons {
+            value_t left;
+            value_t right;
+        } cons;
+
+        struct proc {
+            size_t argc;
+            value_t *arg_keys;
+            env_t parent_env;
+            
+            size_t body_len;
+            struct token *body;
+        } proc;
+
+        struct proc_builtin {
+            size_t argc;
+            builtin_proc_t proc;
+        } proc_builtin;
+    } value;
+
+    size_t refs;
+};
+
+value_t value_create(enum value_type type, void * value);
+void value_destroy(value_t value);
+
+value_t value_from_token(struct token *token);
+value_t value_copy(value_t value);
+int value_string(value_t value, size_t buf_sz, char *buf);
+
+#endif