NumberFormatter.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 <stdlib.h>
 
#include "NumberFormatter.h"
 
#define _Class _NumberFormatter
 
#pragma mark - NumberFormatter
 
static NumberFormatter *initWithFormat(NumberFormatter *self, const char *fmt) {
 
    self = (NumberFormatter *) super(Object, self, init);
    if (self) {
        self->fmt = fmt ?: NUMBERFORMAT_DECIMAL;
    }
 
    return self;
}
 
static Number *numberFromString(const NumberFormatter *self, const String *string) {
 
    if (string) {
        double value;
 
        const int res = sscanf(string->chars, self->fmt, &value);
        if (res == 1) {
            return $(alloc(Number), initWithValue, value);
        }
    }
 
    return NULL;
}
 
static String *stringFromNumber(const NumberFormatter *self, const Number *number) {
 
    return $(alloc(String), initWithFormat, self->fmt, number->value);
}
 
#pragma mark - Class lifecycle
 
static void initialize(Class *clazz) {
 
    ((NumberFormatterInterface *) clazz->interface)->numberFromString = numberFromString;
    ((NumberFormatterInterface *) clazz->interface)->initWithFormat = initWithFormat;
    ((NumberFormatterInterface *) clazz->interface)->stringFromNumber = stringFromNumber;
}
 
Class *_NumberFormatter(void) {
    static Class *clazz;
    static Once once;
 
    do_once(&once, {
        clazz = _initialize(&(const ClassDef) {
            .name = "NumberFormatter",
            .superclass = _Object(),
            .instanceSize = sizeof(NumberFormatter),
            .interfaceOffset = offsetof(NumberFormatter, interface),
            .interfaceSize = sizeof(NumberFormatterInterface),
            .initialize = initialize,
        });
    });
 
    return clazz;
}
 
#undef _Class