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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* preprocess.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/04/03 08:58:49 by charles #+# #+# */
/* Updated: 2020/07/20 17:36:09 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
#include "ms_glob.h"
#include "lexer.h"
#include "eval.h"
static bool st_escapable(char c, enum e_token_tag tag)
{
if (tag & TAG_STR)
return (true);
if ((tag & TAG_STR_DOUBLE) && (c == '\\' || c == '"' || c == '$'))
return (true);
return (false);
}
static char *st_iterpolate_env(char *str, enum e_token_tag tag, t_env env)
{
size_t i;
t_ftdstr *dstr;
char *match;
if ((dstr = ft_dstrwrap(str)) == NULL)
return (NULL);
i = -1;
while (++i < dstr->length)
if (dstr->str[i] == '\\' && st_escapable(dstr->str[i + 1], tag))
ft_dstrerase(dstr, i, 1);
else if (dstr->str[i] == '$' && !ft_isalnum(dstr->str[i + 1])
&& dstr->str[i + 1] != '_'
&& dstr->str[i + 1] != '?') // $ alone
continue;
else if (dstr->str[i] == '$')
{
if ((match = env_search_first_match(env, dstr->str + i + 1)) == NULL)
{
ft_dstrerase(dstr, i, utils_var_end(dstr->str + i + 1));
i--;
}
else
{
if (ft_dstrsubstitute(dstr, match, i, utils_var_end(dstr->str + i + 1)) == NULL)
{
ft_dstrdestroy(dstr);
return (NULL);
}
i += ft_strlen(match) - 1;
}
}
return (ft_dstrunwrap(dstr));
}
static char *st_iterpolate_globs(char *str)
{
char **strs;
int i;
if ((strs = ft_splitf(str, ' ')) == NULL)
return (NULL);
i = 0;
while (strs[i] != NULL)
{
if (ft_strchr(strs[i], '*') != NULL
&& (strs[i] = ms_globf(strs[i])) == NULL)
{
ft_split_destroy(strs);
return (NULL);
}
i++;
}
return (ft_strsjoinf(strs, " "));
}
static int st_splat_arg(t_ftvec *argv, int i)
{
t_token *splated;
char **strs;
int j;
if ((splated = ft_vectake(argv, i)) == NULL
|| (strs = ft_split(splated->content, ' ')) == NULL)
{
token_destroy(splated);
return (-1);
}
j = 0;
while (strs[j] != NULL)
{
if (ft_vecinsert_safe(argv, i + j, token_new(TAG_STR, strs[j])) == NULL)
{
token_destroy(splated);
ft_split_destroy(strs);
return (-1);
}
j++;
}
token_destroy(splated);
ft_split_destroy(strs);
return (i + j - 1);
}
static void st_iter_func_unwrap_token(void **addr)
{
char *content;
content = (*(t_token**)addr)->content;
free(*(t_token**)addr);
*(char**)addr = content;
}
// need to free argv on error
char **preprocess(t_ftlst **tokens, t_env env)
{
size_t i;
t_token *token;
t_ftvec *argv;
if ((argv = ft_vecfrom_lst(*tokens)) == NULL)
{
ft_lstdestroy(tokens, NULL);
return (NULL);
}
ft_lstdestroy(tokens, NULL);
i = -1;
while (++i < argv->size)
{
token = argv->data[i];
/* printf("|%s| %d\n", token->content, token->tag & TAG_STICK); */
if (token->tag & TAG_STR_SINGLE)
continue ;
token->content = st_iterpolate_env(token->content, token->tag, env);
if (token->tag & TAG_STR)
{
if (ft_strchr(token->content, '*') != NULL)
token->content = st_iterpolate_globs(token->content);
if (ft_strchr(token->content, ' ') != NULL)
{
if ((i = st_splat_arg(argv, i)) == (size_t)-1)
return (NULL);
if (token->tag & TAG_STICK) // FIXME temporary will not work with `echo *''`
((t_token*)argv->data[i])->tag |= TAG_STICK;
}
}
}
/* printf("-------\n"); */
t_token *next;
i = -1;
while (++i < argv->size - 1)
{
token = argv->data[i];
/* printf("|%s| %d\n", token->content, token->tag & TAG_STICK); */
while (token->tag & TAG_STICK && i + 1 < argv->size)
{
/* printf("2|%s|\n", token->content); */
next = argv->data[i + 1];
token->content = ft_strjoinf_fst(token->content, next->content);
if (token->content == NULL)
return (NULL);
token->tag &= next->tag;
ft_vecremove(argv, i + 1, (void (*)(void*))token_destroy);
}
}
ft_veciter_addr(argv, st_iter_func_unwrap_token);
ft_vecpush(argv, NULL);
return ((char**)ft_vecunwrap(argv));
}
// need to free tokens
char *preprocess_filename(t_ftlst **tokens, t_env env)
{
char **strs;
char *ret;
if ((strs = preprocess(tokens, env)) == NULL
|| strs[0] == NULL)
return (NULL);
if (strs[1] != NULL)
{
/* save tokens */
errorf("%s: ambiguous redidrect\n", strs[1]);
ft_split_destroy(strs);
return (NULL);
}
ret = strs[0];
free(strs);
return (ret);
}
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