Shell Programming and Scripting

perl -0ne 's/\\emph{//g;$i=0;while(/./gs){$i-- if $& eq "{";$i++ if $& eq "}"; if ($i<1){print $&}else{$i=0}}' infile > outfile

#import "NSArray+ObjectiveSugar.h"
#import "NSMutableArray+ObjectiveSugar.h"
#import "NSString+ObjectiveSugar.h"

static NSString * const OSMinusString = @"-";

@implementation NSArray (ObjectiveSugar)

- (id)sample {
    if (self.count == 0) return nil;

    NSUInteger index = arc4random_uniform((u_int32_t)self.count);
    return self[index];
}

- (id)objectForKeyedSubscript:(id)key {
    if ([key isKindOfClass:[NSString class]])
        return [self subarrayWithRange:[self rangeFromString:key]];

    else if ([key isKindOfClass:[NSValue class]])
        return [self subarrayWithRange:[key rangeValue]];

    else
        [NSException raise:NSInvalidArgumentException format:@"expected NSString or NSValue argument, got %@ instead", [key class]];

    return nil;
}

- (NSRange)rangeFromString:(NSString *)string {
    NSRange range = NSRangeFromString(string);

    if ([string containsString:@"..."]) {
        range.length = isBackwardsRange(string) ? (self.count - 2) - range.length : range.length - range.location;

    } else if ([string containsString:@".."]) {
        range.length = isBackwardsRange(string) ? (self.count - 1) - range.length : range.length - range.location + 1;
    }

    return range;
}

filename.m
- (id)sample -- 3 (line of code count)
- (id)objectForKeyedSubscript:(id)key -- 7 (line of code count)
- (NSRange)rangeFromString:(NSString *)string  -- 7 (line of code count)