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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* interpolation.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/10/09 15:27:46 by cacharle #+# #+# */
/* Updated: 2020/10/10 11:07:57 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
#include "lexer.h"
#include "minishell.h"
/*
** \brief Split a string into token
** \param str String to split
** \return The list of tokens or NULL on error
*/
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));
}
#define BEFORE 0
#define MATCH 1
#define AFTER 2
/*
** \brief Search for a match in the environmnet
** initialize strs variable if found
** \param strs Strings to intialise
** strs[0] string before the match
** strs[1] interpolation match
** strs[2] string after the match
** \param env Environment
** \param str Current string to search in the environment
** \param i Current position in the str
** \return Return true on match, false otherwise
*/
static bool st_make_strs(char *strs[3], t_env env, char *str, size_t i)
{
size_t var_len;
var_len = env_key_len(&str[i + 1], true) + 1;
if ((strs[MATCH] = env_search_first_match(env, &str[i + 1])) == NULL)
{
ft_memmove(&str[i], &str[i + var_len],
ft_strlen(&str[i + var_len]) + 1);
return (false);
}
str[i] = '\0';
strs[BEFORE] = str;
strs[AFTER] = &str[i + var_len];
return (true);
}
/*
** \brief Merge the fields tokens in the current token
** \param strs before/match/after strings
** \param curr Pointer to list where to merge the fields
** \param fields Fields to merge in curr
** \param len The current position in the string after the interpolation
** \return Returns len because of norm complience trick
*/
static size_t st_merge_fields_in_curr(
char *strs[3], t_tok_lst **curr, t_tok_lst *fields, size_t len)
{
t_tok_lst *last;
last = tok_lst_last(fields);
last->tag = (*curr)->tag;
(*curr)->tag = TAG_STR;
(*curr)->content = ft_strjoinf_snd(strs[BEFORE], fields->content);
last->content = ft_strjoinf_fst(last->content, strs[AFTER]);
free(strs[BEFORE]);
last->next = (*curr)->next;
(*curr)->next = fields->next;
(*curr) = last;
free(fields);
return (len);
}
/*
** \brief Interpolate a non quoted string
** \param strs before/match/after strings
** \param curr Current token
** \param i Current position in string
** \param prev_tag Previous Token tag
** \return The position after the interpolation
*/
static size_t st_interpolate_non_quoted(
char *strs[3], t_tok_lst **curr, size_t i, enum e_tok prev_tag)
{
t_tok_lst *fields;
size_t len;
fields = st_field_split(strs[MATCH]);
if (fields == NULL)
return (i);
len = ft_strlen(tok_lst_last(fields)->content);
if (!(prev_tag & TAG_STICK) && *strs[BEFORE] == '\0' &&
*fields->content == '\0')
ft_lstpop_front((t_ftlst **)&fields, free);
if (!((*curr)->tag & TAG_STICK) && *strs[AFTER] == '\0' &&
*tok_lst_last(fields)->content == '\0')
ft_lstpop_back((t_ftlst **)&fields, free);
if (fields != NULL && fields->next == NULL)
{
(*curr)->content =
ft_strjoin3(strs[BEFORE], fields->content, strs[AFTER]);
free(strs[BEFORE]);
tok_lst_destroy(&fields, free);
return (i + len);
}
else if (fields != NULL)
return (st_merge_fields_in_curr(strs, curr, fields, len));
return (i);
}
/*
** \brief Interpolate the string in a token
** \param ptrs Norm complience trick
** ptrs[0] (char*) current string
** ptrs[1] (t_tok_lst**) current token
** \param i Current position in token
** \param prev_tag Tag of the previous token
** \param env Environment
** \return The position in the token after interpolation
*/
size_t interpolate(
void *ptrs[2], size_t i, enum e_tok prev_tag, t_env env)
{
char *strs[3];
char *str;
t_tok_lst **curr;
str = ptrs[INTERPOLATION_STR];
curr = ptrs[INTERPOLATION_CURR];
if (!st_make_strs(strs, env, str, i))
return (i);
if ((*curr)->tag & TAG_STR_DOUBLE)
{
(*curr)->content = ft_strjoin3(strs[BEFORE], strs[MATCH], strs[AFTER]);
free(strs[BEFORE]);
return (i + ft_strlen(strs[MATCH]));
}
return (st_interpolate_non_quoted(strs, curr, i, prev_tag));
}
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