/*
 * Copyright (c) 2007-2014 by Evernote Corporation, All rights reserved.
 *
 * Use of the source code and binary libraries included in this package
 * is permitted under the following terms:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "NSRegularExpression+ENAGRegex.h"

@implementation NSRegularExpression (ENAGRegex)
+ (NSRegularExpression *) enRegexWithPattern:(NSString *)pattern {
    NSError *regexError = nil;
    NSRegularExpression *result = [NSRegularExpression regularExpressionWithPattern:pattern
                                                                            options:0
                                                                              error:&regexError];
    if (result == nil) {
        NSLog(@"regularExpressionWithPattern:%@ returned error:%@", pattern, regexError);
    }
    return result;
}

- (BOOL) enFindInString:(NSString *)string {
    NSTextCheckingResult *result = [self firstMatchInString:string
                                                    options:0
                                                      range:NSMakeRange(0, [string length])];
    return (result != nil);
}

- (BOOL) enMatchesString:(NSString *)string {
    NSRange stringRange = NSMakeRange(0, [string length]);
    NSTextCheckingResult *result = [self firstMatchInString:string
                                                    options:0
                                                      range:stringRange];
    
    if (result == nil) {
        return NO;
    }
    return NSEqualRanges([result range], stringRange);
}

- (NSArray *) enCapturedSubstringsOfString:(NSString *)string {
    __block NSMutableArray *retVal = [NSMutableArray array];
    [self enumerateMatchesInString:string
                           options:0
                             range:NSMakeRange(0, [string length])
                        usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
                            for (NSUInteger i=0; i<[result numberOfRanges]; i++) {
                                NSRange range = [result rangeAtIndex:i];
                                if (range.location == NSNotFound) {
                                    [retVal addObject:[NSString string]];
                                }
                                else {
                                    NSString *matchedString=[string substringWithRange:range];
                                    [retVal addObject:matchedString];
                                }
                            }
                        }];
    return retVal;
    
}

- (NSString *)enReplaceWithString:(NSString *)rep inString:(NSString *)str {
    return [self stringByReplacingMatchesInString:str
                                          options:0
                                            range:NSMakeRange(0, [str length])
                                     withTemplate:rep];
}

@end
