//
//  StringHelper.m
//  IOSBoilerplate
//
//  Copyright (c) 2011 Alberto Gimeno Brieba
//  
//  Permission is hereby granted, free of charge, to any person
//  obtaining a copy of this software and associated documentation
//  files (the "Software"), to deal in the Software without
//  restriction, including without limitation the rights to use,
//  copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following
//  conditions:
//  
//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.
//  
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
//  OTHER DEALINGS IN THE SOFTWARE.
//  

#import "StringHelper.h"

@implementation NSString (helper)

- (NSString*)substringFrom:(NSInteger)a to:(NSInteger)b {
	NSRange r;
	r.location = a;
	r.length = b - a;
	return [self substringWithRange:r];
}

- (NSInteger)indexOf:(NSString*)substring from:(NSInteger)starts {
	NSRange r;
	r.location = starts;
	r.length = [self length] - r.location;
	
	NSRange index = [self rangeOfString:substring options:NSLiteralSearch range:r];
	if (index.location == NSNotFound) {
		return -1;
	}
	return index.location + index.length;
}

- (NSString*)trim {
	return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

- (BOOL)startsWith:(NSString*)s {
	if([self length] < [s length]) return NO;
	return [s isEqualToString:[self substringFrom:0 to:[s length]]];
}

- (BOOL)containsString:(NSString *)aString
{
	NSRange range = [[self lowercaseString] rangeOfString:[aString lowercaseString]];
	return range.location != NSNotFound;
}

- (NSString *)urlEncode
{
    NSString *encodedString = [self stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
	return encodedString;
}

@end