#ifndef AST_BASE_H
#define AST_BASE_H

#include <stdbool.h>
#include <stdlib.h>

enum ast_type
{
    AST_END,
    AST_LIST,
    AST_IF,
    AST_AND_OR,
    AST_REDIR,
    AST_VOID,
    AST_CMD,
    AST_WORD,
    AST_PIPE,
    AST_NEG,
    AST_LOOP,
    AST_ASSIGNMENT
};

struct ast
{
    enum ast_type type;

    /**
     * Data associated with this AST node. It can be one of the following:
     * - NULL (AST_END)
     * - struct ast_if* (AST_IF)
     * - struct ast_command* (AST_CMD)
     * - struct ast_and_or* (AST_AND_OR)
     * - struct ast_redir* (AST_REDIR)
     * - and a lot more now...
     */
    void *data;
};

/* @brief: returns an ast* with corresponding data and type.
 *
 * @note: this function should only be called by ast_create_[TYPE] functions.
 */
struct ast *ast_create(enum ast_type type, void *data);

/* @brief: frees the given ast. If ast is NULL, does nothing.
 *
 */
void ast_free(struct ast **node);

#endif /* ! AST_BASE_H */