#ifndef INCLUDED_TERM_H
#define INCLUDED_TERM_H

#include "token.h"

#include <stddef.h>

typedef enum {
    TYPE_VARIABLE,
    TYPE_LAMBDA,
    TYPE_APPLY,
} LambdaTermType;

typedef struct _LambdaTerm LambdaTerm;
struct _LambdaTerm {
    LambdaTermType type;
    union {
        struct {
            char *name;
            size_t name_len;
        } v;
        struct {
            char *arg;
            size_t arg_len;
            LambdaTerm *body;
        } l;
        struct {
            LambdaTerm *func;
            LambdaTerm *arg;
        } a;
    };
};

LambdaTerm *read_lambda_term(TokenStream *restrict stream,
                             ParseError *restrict err_out);

#endif