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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* expr.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/10/10 08:42:24 by cacharle #+# #+# */
/* Updated: 2020/10/10 18:28:02 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
#include "parser.h"
/*
** push redirection token
** push while token is str and stick
** push last str token
*/
/*
** \brief Push tokens which bellong to a redirection in a token list
** \param input Tokens where to extract the redirection tokens
** \param redirs List where to push the redirections tokens
** \return Parsed struct with the unconsumed input
*/
t_parsed *parse_redir(t_tok_lst *input, t_tok_lst **redirs)
{
t_parsed *ret;
tok_lst_push_back(redirs, tok_lst_uncons(&input));
while (input != NULL && input->tag & TAG_IS_STR && input->tag & TAG_STICK &&
input->next != NULL && input->next->tag & TAG_IS_STR)
tok_lst_push_back(redirs, tok_lst_uncons(&input));
if (input == NULL)
return (parsed_unexpected("newline"));
if (!(input->tag & TAG_IS_STR))
{
ret = parsed_unexpected(input->content);
tok_lst_destroy(&input, free);
return (ret);
}
tok_lst_push_back(redirs, tok_lst_uncons(&input));
return (parsed_new(NULL, input));
}
/*
** \brief Parse a command (this is the continuation of
** parse_cmd splited for norm complience)
** \param input Input tokens
** \return Parsed struct containning a command AST
*/
static t_parsed *st_parse_cmd_body(t_tok_lst *input)
{
t_ast *ast;
t_parsed *tmp;
exit_if((ast = ast_new(AST_CMD)) == NULL);
while (input != NULL &&
(input->tag & TAG_IS_STR || input->tag & TAG_IS_REDIR))
{
if (input->tag & TAG_IS_STR)
tok_lst_push_back(&ast->cmd_argv, tok_lst_uncons(&input));
else if (input->tag & TAG_IS_REDIR)
{
tmp = parse_redir(input, &ast->redirs);
if (parsed_check(tmp))
{
tok_lst_destroy(&tmp->rest, free);
ast_destroy(ast);
return (tmp);
}
input = tmp->rest;
free(tmp);
}
}
return (parsed_new(ast, input));
}
/*
** \brief Check if the first token can be included in a command
** then parse a command
** \param input Input tokens
** \return Parsed error if the first token isn't a redirection or string
** Parsed containning a command AST otherwise
*/
t_parsed *parse_cmd(t_tok_lst *input)
{
t_parsed *ret;
if (input->tag & TAG_IS_SEP || input->tag == TAG_PIPE ||
input->tag == TAG_PARENT_CLOSE)
{
ret = parsed_unexpected(input->content);
tok_lst_destroy(&input, free);
return (ret);
}
return (st_parse_cmd_body(input));
}
/*
** \brief Parse a parenthesized expression
** \param input Input tokens
** \return Parsed containning a parenthesis AST
** Parsed error if parenthesis don't match
** \note Parenthesis can be followed by redirections
*/
static t_parsed *st_parse_parenthesis(t_tok_lst *input)
{
t_parsed *parsed;
t_parsed *tmp;
t_ast *ast;
if (parsed_check(parsed = parse_op(input)))
return (parsed);
if ((input = parsed->rest) == NULL || !(input->tag & TAG_PARENT_CLOSE))
{
ast_destroy(parsed->ast);
free(parsed);
return (parsed_expected());
}
tok_lst_pop_front(&input, free);
exit_if((ast = ast_new(AST_PARENT)) == NULL);
ast->parent_ast = parsed->ast;
parsed->ast = ast;
while (input != NULL && input->tag & TAG_IS_REDIR)
{
if (parsed_check(tmp = parse_redir(input, &parsed->ast->redirs)))
return (tmp);
input = tmp->rest;
free(tmp);
}
parsed->rest = input;
return (parsed);
}
/*
** \brief Try to parse parenthesis, if fail parse a command.
** \param input Input tokens
** \return Whatever parse_parenthesis or parse_cmd returns
*/
t_parsed *parse_expr(t_tok_lst *input)
{
if (input->tag & TAG_PARENT_OPEN)
{
tok_lst_pop_front(&input, free);
if (input == NULL)
return (parsed_expected());
return (st_parse_parenthesis(input));
}
return (parse_cmd(input));
}
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