42sh/src/parser/grammar_advanced.c

#include "grammar_advanced.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "grammar_basic.h"

bool

struct ast *parse_redirection(struct lexer_context *ctx)
{
    struct token *token = PEEK_TOKEN();
    int io_number = -1;
    if (token->type == TOKEN_IONUMBER)
    {
        io_number = atoi(token->data);
        POP_TOKEN();
        token = PEEK_TOKEN();
    }

    if (!is_token_redir(token))
    {
        perror("Syntax error: expected a redirection token but got something "
             "else");
        return NULL;
    }
    // char *redir_op = strdup(token->data);
    POP_TOKEN();

    token = PEEK_TOKEN();
    if (token->type != TOKEN_WORD)
    {
        perror("Syntax error: expected a word after redirection");
        // free(redir_op);
        return NULL;
    }
    char *target = strdup(token->data);
    POP_TOKEN();

    return ast_create_redir(io_number, redir_op, target);
}

struct ast *parse_prefix(struct lexer_context *ctx)
{
    return parse_redirection(ctx);
}