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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* parse.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: nahaddac <nahaddac@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 18:09:04 by nahaddac #+# #+# */
/* Updated: 2020/06/18 12:48:20 by nahaddac ### ########.fr */
/* */
/* ************************************************************************** */
/*
** \file parse.c
** \brief Parser
*/
#include "parser.h"
#include "lexer.h"
t_ftlst *push_token(t_ftlst **tokens, t_token *pushed)
{
t_ftlst *tmp;
if ((tmp = ft_lstnew(pushed)) == NULL)
return (NULL);
ft_lstpush_back(tokens, tmp);
return (tmp);
}
t_ret *ret_wrap_ast(t_ast *ast, t_ftlst *rest)
{
t_ret *ret;
if ((ret = malloc(sizeof(t_ret))) == NULL)
return (NULL);
ret->unexpected = NULL;
ret->rest = rest;
ret->ast = ast;
return ret;
}
t_ret *parse_cmd(t_ftlst *input)
{
enum e_token_tag tag;
t_ast *ast;
ast = ast_new(AST_CMD);
while (input != NULL)
{
tag = ((t_token *)input->data)->tag;
if (tag & TAG_IS_STR)
{
push_token(&ast->cmd_argv, input->data);
}
else if (tag & TAG_IS_REDIR)
{
while(input != NULL)
{
push_token(&ast->redirs, input->data);
if (tag & TAG_IS_STR && tag & TAG_STICK)
input = input->next;
else if (tag & TAG_IS_REDIR)
input = input->next;
else
break;
tag = ((t_token *)input->data)->tag;
}
}
else
return ret_wrap_ast(ast, input);
input = input->next;
}
return ret_wrap_ast(ast, input);
}
// <cmd> ::= (<string> | <redir>)+
// <op> ::= <expr> <sep> <op> | <expr>
// <expr> ::= '(' <op> ')' | <cmd>
t_ret *parse_op(t_ftlst *input)
{
t_ast *ast;
t_ret *left_ret;
t_ret *right_ret;
enum e_token_tag sep_tag;
left_ret = parse_expr(input);
input = left_ret->rest;
if (input == NULL || ((t_token*)input->data)->tag == TAG_PARENT_CLOSE)
return ret_wrap_ast(left_ret->ast, input);
sep_tag = ((t_token*)input->data)->tag;
input = input->next;
right_ret = parse_op(input);
ast = ast_new(AST_OP);
ast->op.left = left_ret->ast;
ast->op.right = right_ret->ast;
ast->op.sep = sep_tag;
return ret_wrap_ast(ast, right_ret->rest);
}
t_ret *parse_expr(t_ftlst *input)
{
t_ret *tmp;
enum e_token_tag tag;
tag = ((t_token*)input->data)->tag;
if (tag == TAG_PARENT_OPEN)
{
tmp = parse_op(input->next);
input = tmp->rest;
tag = ((t_token*)input->data)->tag;
if (tag != TAG_PARENT_CLOSE)
return (NULL);
input = input->next;
tmp->rest = input;
return tmp;
}
return parse_cmd(input);
}
t_ret *parse(t_ftlst *input)
{
return parse_op(input);
}
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