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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* preprocess.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/04/03 08:58:49 by charles #+# #+# */
/* Updated: 2020/08/27 20:43:22 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
#include "lexer.h"
#include "eval.h"
static t_tok_lst *st_field_split(char *str)
{
t_tok_lst *ret;
char *match;
ret = NULL;
while (*str != '\0')
{
if ((match = ft_strchr(str, ' ')) == NULL)
{
if (tok_lst_push_front(&ret, tok_lst_new(TAG_STR, str)) == NULL)
return (tok_lst_destroy(&ret, free));
break;
}
if (tok_lst_push_front(&ret, tok_lst_new_until(TAG_STR, str, match - str)) == NULL)
return (tok_lst_destroy(&ret, free));
while (*++match == ' ')
;
str = match;
if (*str == '\0' && tok_lst_push_front(&ret, tok_lst_new(TAG_STR, str)) == NULL)
return (tok_lst_destroy(&ret, free));
}
return ((t_tok_lst*)ft_lstreverse_ret((t_ftlst*)ret));
}
t_tok_lst *st_stick_tokens(t_tok_lst *tokens)
{
t_tok_lst *curr;
curr = tokens;
while (curr != NULL)
{
// curr->next shouldn't be null
if (curr->tag & TAG_STICK && curr->next != NULL)
{
curr->content = ft_strjoinf_fst(curr->content, curr->next->content);
t_tok_lst *tmp = curr->next->next;
curr->tag = curr->next->tag;
ft_lstdelone((t_ftlst*)curr->next, free);
curr->next = tmp;
continue;
}
curr = curr->next;
}
return (tokens);
}
char **st_tokens_to_argv(t_tok_lst *tokens)
{
char **ret;
size_t i;
if ((ret = ft_calloc(ft_lstsize((t_ftlst*)tokens) + 1, sizeof(char*))) == NULL)
return (NULL);
i = 0;
while (tokens != NULL)
{
ret[i++] = tokens->content;
tokens = tokens->next;
}
tok_lst_destroy(&tokens, free);
return (ret);
}
char **preprocess(t_tok_lst **tokens, t_env env)
{
t_tok_lst *curr;
enum e_tok prev_tag;
prev_tag = 0;
curr = *tokens;
while (curr != NULL)
{
if (curr->tag & (TAG_STR | TAG_STR_DOUBLE))
{
char *str = curr->content;
size_t i = -1;
while (str[++i] != '\0')
{
str = curr->content;
// escape
if (str[i] == '\\'
&& (curr->tag & TAG_STR
|| ((curr->tag & TAG_STR_DOUBLE) && ft_strchr("\\\"$", str[i + 1]))))
{
ft_memmove(&str[i], &str[i + 1], ft_strlen(&str[i + 1]) + 1);
continue;
}
// interpolate
if (str[i] == '$')
{
char *match;
size_t var_len = utils_var_end(&str[i + 1]);
if ((match = env_search_first_match(env, &str[i + 1])) == NULL)
{
ft_memmove(&str[i], &str[i + var_len], var_len );
i--;
continue;
}
char *before;
char *after;
size_t len;
str[i] = '\0';
before = str;
after = &str[i + var_len];
if (curr->tag & TAG_STR)
{
t_tok_lst *fields = st_field_split(match);
len = ft_strlen(tok_lst_last(fields)->content);
if (!(prev_tag & TAG_STICK) && *before == '\0' && *fields->content == '\0')
ft_lstpop_front((t_ftlst**)&fields, free);
if (!(curr->tag & TAG_STICK) && *after == '\0'
&& *tok_lst_last(fields)->content == '\0')
ft_lstpop_back((t_ftlst**)&fields, free);
if (fields == NULL)
// delete curr?
;
else if (fields->next == NULL)
{
curr->content = ft_strjoin3(before, fields->content, after);
i += len - 1;
}
else
{
curr->content = ft_strjoin(before, fields->content);
tok_lst_last(fields)->content =
ft_strjoin(tok_lst_last(fields)->content, after);
t_tok_lst *tmp = curr->next;
curr->next = fields->next;
curr = tok_lst_last(fields);
curr->next = tmp;
i = len - 1;
str = curr->content;
}
}
else if (curr->tag & TAG_STR_DOUBLE)
{
curr->content = ft_strjoin3(before, match, after);
i += ft_strlen(match) - 1;
}
}
}
}
prev_tag = curr->tag;
curr = curr->next;
}
st_stick_tokens(*tokens);
return (st_tokens_to_argv(*tokens));
}
// need to free tokens
char *preprocess_filename(t_tok_lst **tokens, t_env env)
{
char **strs;
char *ret;
if ((strs = preprocess(tokens, env)) == NULL
|| strs[0] == NULL)
{
free(strs);
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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