Enum.c

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/*
 * Objectively: Ultra-lightweight object oriented framework for GNU C.
 * Copyright (C) 2014 Jay Dolan <jay@jaydolan.com>
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
#include <assert.h>
#include <stdio.h>
#include <string.h>
 
#include "Enum.h"
#include "MutableString.h"
 
String *nameof(const EnumName *names, int value) {
 
    for (const EnumName *name = names; name->name; name++) {
        if (name->value == value) {
            return $$(String, stringWithCharacters, name->name);
        }
    }
 
    MutableString *string = NULL;
 
    for (const EnumName *name = names; name->name; name++) {
        if (name->value) {
            if ((name->value & value) == name->value) {
                if (string == NULL) {
                    string = $$(MutableString, string);
                } else {
                    $(string, appendCharacters, " | ");
                }
                $(string, appendCharacters, name->name);
            }
        }
    }
 
    return (String *) string;
}
 
int valueof(const EnumName *names, const char *chars) {
 
    int value = 0;
 
    const char *c = chars;
    while (*c) {
        const size_t size = strcspn(c, " |");
        if (size) {
            const EnumName *en;
            for (en = names; en->name; en++) {
                if (strncmp(en->name, c, size) == 0) {
                    value |= en->value;
                    break;
                }
                if (en->alias && strncmp(en->alias, c, size) == 0) {
                    value |= en->value;
                    break;
                }
            }
            if (en->name == NULL) {
                fprintf(stderr, "%s: Unknown character sequence: %s\n", __func__, c);
            }
        }
        c += size;
        c += strspn(c, " |");
    }
 
    return value;
}