42sh/src/parser/parser.c

#include "parser.h"

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

#include "lexer/lexer.h"
#include "utils/lists/lists.h"

// === Static functions

/* Returns true if c is a command terminator, false otherwise
 */
static bool isterminator(char c)
{
    switch (c)
    {
    case '\n':
    case ';':
    case EOF:
        return true;
    default:
        return false;
    }
}

/* Parses a simple list of words (command and arguments)
 * and returns the resulting ast
 */
static struct ast *parse_simple_command(void)
{
    struct list *cmd_elements = NULL;
    char *token = get_token();
    if (token == NULL) // just in case ?
        return NULL;

    while (token != NULL && !isterminator(token[0]))
    {
        cmd_elements = list_append(cmd_elements, token);
        token = get_token();
    }

    if (token == NULL)
        return NULL; // TODO handle error

    struct ast *result = ast_create_cmd(cmd_elements);
    return result;
}

// === Functions

struct ast *get_ast()
{
    struct ast *result = NULL;
    struct ast *current_node = NULL;

    // char *token = get_token();

    return result;
}

// TODO
struct ast *get_ast_str(char *command)
{
    (void)command;
    return NULL;
}