NSString+Ruby 
Intro
NSString+Ruby is an attempt to improve NSString by porting Ruby String methods onto a category on NSString. This means you can use the majority of Ruby String methods in obj-c, with the exception of a few unnecessary, and unimplimented (as of yet).
Next Improvements
Even better format/concat options
Ruby style block execution
Differences / Important notes
Changes have been made to method names, mostly to line up with traditional objective-c naming conventions, the rule generally being that all shorthand words have been extended to their full equivalent (eg: rStrip is rightStrip).
Original methods provided by objective-c are not aliased to Ruby equivalents.
Blocks are available for some methods, and not others, mostly for language paradigm reasons.
Operator overloading has been mimicked to the best of our ability, using clever shorthand and unnamed methods, the equivalent of the concatenation operator (+), would be (:) in NSString+Ruby, as follows:
"hello " + "world" #=>"hello world"[@"hello ":@"world",nil]; //"hello world"This is still a little ugly, but is the least amount of code you'd need to write in obj-c to do concatenation now.
Array/index style accessors are provided through:
-(id)objectAtIndexedSubscript:(NSUInteger)index;
-(id)objectForKeyedSubscript:(id)key;...and provide for the majority of Ruby style functionality, the following Ruby methods, for example, are all implemented:
(Ruby)
a = "hello there"
a[1] #=> "e"
a[2, 3] #=> "llo"
a[-3, 2] #=> "er"
a[2..3] #=> "ll"
a[7..-2] #=> "her"
a[-4..-2] #=> "her"
a[-2..-4] #=> nil
a[12..-1] #=> nil
a[%r[aeiou](.){2}] #=> "ell"
a["lo"] #=> "lo"
a["bye"] #=> nilNSString *a = @"hello there";
a[1]; // "e"
[a:2:3]; // "llo"
[a:-3:2]; // "er"Ranges are provided through C-string shorthand and nameless methods, allowing you to write the following:
NSString *a = @"hello there";
[a:2:"..":3]; // "ll"
[a:7:"..":-2]; // "her"
[a:-4:"..":-2] // "her"
[a:-2:"..":-4] // nil
[a:12:"..":-1] // nilRegex matching also works, and is provided as the primary means of matching, almost anything that takes a string can take a regex pattern.
NSString *a = @"hello there";
a[@"[aeiou](.){2}"] // ell
a["lo"] // lo
a["bye"] // niliOS Requirements / ARC Status
NSString+Ruby requires iOS 5.0+, and is ARC enabled.
Installation
Installation can be done using CocoaPods:
add pod 'NSString+Ruby' to your Podfile, then run pod install.
Tests
Tests are provided through Kiwi ( https://github.com/allending/Kiwi ), and are largely reproduced from the Ruby String Reference page ( http://www.ruby-doc.org/core-1.9.3/String.html ), some methods may be changed slightly in how they function, but for the most part the goal is to ape Ruby behaviour.
NSMutableString
NSMutableString has mutating versions of all the usual destructive methods. The modifier InPlace
is used to signify a mutating/destructive method, vs the Ruby ! bang modifier.
Method List
Here is a full equivalence list of methods provided (Notes are provided in brackets for when things are purposefully not implemented, blank lines will be implemented in future versions).
Please consult the Ruby String Reference page ( http://www.ruby-doc.org/core-1.9.3/String.html ) for method behaviour documentation.
NSString
::try_convert
#% (no sensible way to implement this)
#* x:
#+ :
#<< :
#<=> compare:
#== isEqualToString:
#=== ==
#=~ index:
#[] start:shorthand:end |> [@"string" :1:@"..":3]
@"string"[1]
@"string"{@"regex"}
@"string"{@[1,3]}
#[]= (no mutating methods)
#ascii_only? isASCII:
#bytes bytes:
#bytesize
#byteslice
#capitalize capitalizedString
#casecmp caseInsensitiveCompare:
#center center:
center:with:
#chars chars:
#chomp chomp
chomp:
#chop chop
#chr chr
#clear (unnecessary in obj-c)
#codepoints codePoints:
#concat concat:
#count count:
#crypt (unsure as of yet of which method to use for this, wary of providing easily misused insecure method)
#delete delete:
#downcase lowercaseString
#dump (implementation very close to |inspect|, |inspect| might suffice?)
#each_byte bytes:
#each_char chars:
#each_codepointcodepoints:
#each_line lines:
#empty? isEmpty
#encode
#encoding
#end_with? endsWith:
#eql? isEqualToString:
#force_encoding
#getbyte
#gsub substituteAll:
substituteAll:pattern
#hash hash
#hex hex
#include? includes:
#index match:
match:offset:
#insert insert:string:
#inspect inspect
#intern (not viable in obj-c, Ruby specific)
#length length
#lines lines:
#ljust leftJustify:
leftJustify:with:
#lstrip leftStrip
#match index:
index:offset:
#next
#oct octal
#ord ordinal
#partition partition:
#prepend prepend:
#replace (unnecessary in obj-c)
#reverse reverse
#rindex lastIndex:
lastIndex:offset:
#rjust rightJustify:
rightJustify:with:
#rpartition rightPartition:
#rstrip rightStrip
#scan scan:
#setbyte
#size length
#slice start:shorthand:end |> [@"string" :1:@"..":3]
@"string"[1]
@"string"{@"regex"}
@"string"{@[1,3]}
#split split
split:
split:limit:
#squeeze squeeze
squeeze:
#start_with? startsWith:
#strip strip
#sub substituteFirst:
substituteLast:
#succ
#sum sum
sum:
#swapcase swapcase
#to_c
#to_f floatValue
#to_i intValue
#to_r
#to_s (just use self)
#to_str (just use self)
#to_sym (not viable in obj-c, Ruby specific)
#tr (functionality is very similar to gsub for us, suggest using that instead)
#tr_s
#unpack
#upcase uppercaseString
#upto
#valid_encoding?
NSMutableString
#capitalize! capitalizeInPlace
#chomp! chompInPlace
chompInPlace:
#chop! chopInPlace
#delete! deleteInPlace:
#downcase! lowercaseStringInPlace
#gsub! substituteAllInPlace:
substituteAllInPlace:pattern
#lstrip! leftStripInPlace
#reverse! reverseInPlace
#rstrip! rightStripInPlace
#squeeze! squeezeInPlace
squeezeInPlace:
#strip! stripInPlace
#sub! substituteFirstInPlace:
substituteLastInPlace:
#swapcase! swapcaseInPlace
#upcase! uppercaseInPlace