HTMLPurifier_AttrDef_HTML_Pixels.m

//
//   HTMLPurifier_AttrDef_HTML_Pixels.m
//   HTMLPurifier
//
//  Created by Lukas Neumann on 11.01.14.



/**
 * Validates an integer representation of pixels according to the HTML spec.
 */
#import "HTMLPurifier_AttrDef_HTML_Pixels.h"
#import "BasicPHP.h"

@implementation HTMLPurifier_AttrDef_HTML_Pixels

@synthesize max;

/**
 * @param int $max
 */
-(id) initWithMax:(NSNumber*)newMax
{
    self = [super init];

    max = newMax;

    return self;
}

- (id)init
{
    return [self initWithMax:nil];
}

/**
 * @param string $string
 * @param HTMLPurifier_Config $config
 * @param HTMLPurifier_Context $context
 * @return bool|string
 */
- (NSString*)validateWithString:(NSString*)string config:(HTMLPurifier_Config *)config context:(HTMLPurifier_Context *)context
{
    string = trim(string);
    if ([string isEqual:@"0"])
    {
        return string;
    }
    if ([string isEqual:@""])
    {
        return nil;
    }
    NSUInteger length = string.length;
    
    if ((length >= 2) && [substr(string,length - 2) isEqual:@"px"])
    {
        string = [string substringToIndex:(length - 2)];
    }
    if (!stringIsNumeric(string))
    {
        return nil;
    }
    
    int num = [string intValue];
    
    if (num < 0)
    {
        return @"0";
    }
    
    // upper-bound value, extremely high values can
    // crash operating systems, see <http://ha.ckers.org/imagecrash.html>
    // WARNING, above link WILL crash you if you're using Windows
    NSNumber* numToNum = @(num);
    
    if (max && (num > max.integerValue))
    {
        return [NSString stringWithFormat:@"%@",max];
    }
    return [NSString stringWithFormat:@"%@",numToNum];
}

/**
 * @param string $string
 * @return HTMLPurifier_AttrDef
 */
- (HTMLPurifier_AttrDef*)make:(NSString*)string
{
    if ([string isEqual:@""])
    {
        max = nil;
    } else {
        max = @([string intValue]);
    }

    Class class = [self class];

    HTMLPurifier_AttrDef_HTML_Pixels* newAttrDef = [class alloc];

    return [newAttrDef initWithMax:max];
}

@end