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#ifndef MS_EVAL_H
# define MS_EVAL_H
/**
** \file ms_eval.h
** \brief Evaluation module
*/
/*
** arg:
** type ARG
** value string
**
** redir in:
** type REDIRIN
** value fd
**
** redir out:
** type REDIROUT
** value fd
**
** redir append:
** type REDIRAPPEND
** value fd
*/
/**
** \enum t_val_type
** \brief A type for an evaluation node
**
** \param VAL_ERR error
** \param VAL_ERR argument
** \param VAL_REDIR redirection
** \param VAL_SEXPR S-expression
*/
typedef enum
{
VAL_ERR,
VAL_ARG,
VAL_EXEC,
VAL_REDIR_IN,
VAL_REDIR_OUT,
VAL_REDIR_APPEND,
VAL_CMD,
VAL_SEXPR,
} t_val_type;
/**
** \brief An evaluation node struct
** \param type type of node
** \param data union of possible data
** \param data::fd file descriptor for redirection node
** \param data::str string for error, arguments, command
*/
typedef struct
{
t_val_type type;
union
{
char *str;
int code;
int fd;
} data;
} t_val;
/**
** \brief evaluate an AST
** \param path path to commands executable
** \param env environment variables
** \param ast Abstract syntax tree to evaluate
*/
int ms_eval(t_path path, t_env env, t_ast *ast);
#endif
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