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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* parser.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: nahaddac <nahaddac@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 18:09:04 by nahaddac #+# #+# */
/* Updated: 2020/08/27 21:12:21 by charles ### ########.fr */
/* */
/* ************************************************************************** */
/*
** \file parse.c
** \brief Parser
*/
#include "parser.h"
t_parsed *parse_redir(t_tok_lst *input, t_tok_lst **redirs)
{
tok_lst_push_back(redirs, tok_lst_pop_front(&input));
/* input = input->next; */
if (input == NULL)
return (parsed_error("syntax error near unexpected token `newline'\n"));
while(input != NULL
&& input->next != NULL
&& input->next->tag & TAG_IS_STR
&& input->tag & TAG_IS_STR && input->tag & TAG_STICK)
{
tok_lst_push_back(redirs, tok_lst_pop_front(&input));
/* input = input->next; */
}
if (input != NULL && !(input->tag & TAG_IS_STR))
return (parsed_error("syntax error near unexpected token `%s'\n", input->content));
tok_lst_push_back(redirs, tok_lst_pop_front(&input));
return (parsed_new(NULL, input));
}
t_parsed *parse_cmd(t_tok_lst *input)
{
t_ast *ast;
t_parsed *tmp;
if (input->tag & TAG_IS_SEP)
return (parsed_error("syntax error near unexpected token `%s'\n", input->content));
if ((ast = ast_new(AST_CMD)) == NULL)
return (NULL);
while (input != NULL)
{
if (input->tag & TAG_IS_STR)
tok_lst_push_back(&ast->cmd_argv, tok_lst_pop_front(&input));
else if (input->tag & TAG_IS_REDIR)
{
tmp = parse_redir(input, &ast->redirs);
if (tmp == NULL || tmp->syntax_error)
return (tmp);
input = tmp->rest;
}
else
break;
}
return parsed_new(ast, input);
}
// <cmd> ::= (<string> | <redir>)+
// <op> ::= <expr> <sep> <op> | <expr>
// <expr> ::= '(' <op> ')' | <cmd>
t_parsed *parse_op(t_tok_lst *input)
{
t_ast *ast;
t_parsed *left_parsed;
t_parsed *right_parsed;
enum e_tok tag;
left_parsed = parse_expr(input);
if (left_parsed == NULL || left_parsed->syntax_error)
return left_parsed;
input = left_parsed->rest;
if (input == NULL || input->tag & TAG_PARENT_CLOSE)
return parsed_new(left_parsed->ast, input);
tag = input->tag;
if (!(tag & TAG_IS_SEP))
return (parsed_error("syntax error near unexpected token `%s'\n", input->content));
input = input->next;
if (input == NULL)
return (parsed_error("syntax error expected token\n"));
right_parsed = parse_op(input);
if (right_parsed == NULL || right_parsed->syntax_error)
return right_parsed;
ast = ast_new(AST_OP);
ast->op.left = left_parsed->ast;
ast->op.right = right_parsed->ast;
ast->op.sep = tag;
return parsed_new(ast, right_parsed->rest);
}
t_parsed *parse_expr(t_tok_lst *input)
{
t_parsed *tmp;
enum e_tok tag;
t_ast *new_ast;
tag = input->tag;
if (tag & TAG_PARENT_OPEN)
{
if (!(tmp = parse_op(input->next)) || tmp->syntax_error)
return tmp;
input = tmp->rest;
if (input == NULL)
return (parsed_error("syntax error expected token\n"));
tag = input->tag;
if (!(tag & TAG_PARENT_CLOSE))
return (parsed_error("syntax error expected token\n"));
input = input->next;
new_ast = ast_new(AST_PARENT);
new_ast->parent_ast = tmp->ast;
tmp->ast = new_ast;
if (input == NULL)
return tmp;
// could reuse parse_redir instead
tag = input->tag;
while (tag & TAG_IS_REDIR)
{
while(input != NULL)
{
tag = input->tag;
tok_lst_push_back(&tmp->ast->redirs, tok_lst_pop_front(&input));
if (tag & TAG_IS_STR && tag & TAG_STICK)
input = input->next;
else if (tag & TAG_IS_REDIR)
input = input->next;
else
break;
}
if (input == NULL)
break;
input = input->next;
tag = input->tag;
}
tmp->rest = input;
return tmp;
}
return parse_cmd(input);
}
t_parsed *parse(t_tok_lst *input)
{
if (input == NULL)
return NULL;
return (parse_op(input));
}
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