interpreter.h

#include "value.h"

#ifndef _INTERPRETER
#define _INTERPRETER

// A frame is a linked list of bindings, and a pointer to another frame.  A
// binding is a variable name (represented as a string), and a pointer to the
// Value it is bound to. Specifically how you implement the list of bindings is
// up to you.
struct Frame {
    Value *bindings;
    struct Frame *parent;
};

typedef struct Frame Frame;

void interpret(Value *tree);
Value *eval(Value *expr, Frame *frame);

#endif