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#include <err.h>
#include "parser_functions.h"
#include "parser_utils.h"
struct ast *parse_redirection(struct lexer *lexer, enum parser_state *state)
{
// The caller (prefix grammar in this case) will have to attach its
// own ast as the left child of the redir ast
struct ast *redir = ast_create(AST_REDIRECTION);
if (redir == NULL)
{
QUICK_CLEANUP
}
struct token next = lexer_peek(lexer);
union ast_caster cast;
cast.ast = redir;
if (next.type == TOKEN_IONUMBER)
{
cast.ast_r->redirect.fd = next.value;
lexer_pop(lexer);
next = lexer_peek(lexer);
}
else
{
cast.ast_r->redirect.fd = string_create("1");
}
if (next.type != TOKEN_REDIR)
{
cleanup(redir, state);
return NULL;
}
cast.ast_r->redirect.redir = next.value;
if (next.value->data[0] == '<' && cast.ast_r->redirect.fd->data[0] == '1')
{
cast.ast_r->redirect.fd->data[0] = '0';
}
lexer_pop(lexer);
next = lexer_peek(lexer);
if (!(ISWORD(next.type)))
{
cleanup(redir, state);
errx(2, "redir: bad grammar (bad redir).");
}
litteral_reserved_word(&next);
cast.ast_r->redirect.file = next.value;
lexer_pop(lexer);
((struct ast_redirection *)redir)->redirect = cast.ast_r->redirect;
return redir;
}
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