lucky_case

The lucky ruby gem to identify and convert strings from any letter case to another. Plus some extra functions.

I also created a javascript port named lucky-case.

Useful when working with conventions, where class names, method names and file names needs to be converted.

Converters: Only characters, numbers, dashes and underlines are allowed inside a string.
Must not start with dash or number, underlines at the beginning are allowed by default and can be allowed/removed/controlled by parameter (when used for private methods for example)

Usage
Installation
Documentation
Contributing

Usage

You can either use the static LuckyCase class with its method or optionally monkey patch the String class.

Approach 1: Using the static class

require 'lucky_case'

# converters
LuckyCase.snake_case('PascalToSnake')                  # => 'pascal_to_snake'
LuckyCase.upper_snake_case('Train-To-Upper-Snake')     # => 'TRAIN_TO_UPPER_SNAKE'
LuckyCase.pascal_case('snake_to_pascal')               # => 'SnakeToPascal'
LuckyCase.camel_case('dash-to-camel-case')             # => 'dashToCamelCase'
LuckyCase.dash_case('PascalToDashCase')                # => 'pascal-to-dash-case'
LuckyCase.upper_dash_case('PascalToUpperDash')         # => 'PASCAL-TO-UPPER-DASH'
LuckyCase.train_case('snake_to_train_case')            # => 'Snake-To-Train-Case'
LuckyCase.word_case('PascalToWordCase')                # => 'pascal to word case'
LuckyCase.upper_word_case('PascalToUpperWord')         # => 'PASCAL TO UPPER WORD'
LuckyCase.capital_word_case('snake_to_capital_word')   # => 'Snake To Capital Word'
LuckyCase.sentence_case('snake_to_sentence_case')      # => 'Snake to sentence case'
LuckyCase.mixed_case('example_snake_string')           # => 'Example-snake_STRING'

# converter by type
LuckyCase.convert_case('some_snake', :pascal_case)     # => 'SomeSnake'

# transformers
LuckyCase.lower_case('Some_FuckingShit')               # => 'some_fuckingshit'
LuckyCase.upper_case('Some_FuckingShit')               # => 'SOME_FUCKINGSHIT'
LuckyCase.capital('example')                           # => 'Example'
LuckyCase.capitalize('example')                        # => 'Example'
LuckyCase.decapitalize('ExaMple')                      # => 'exaMple'
LuckyCase.swap_case('SomeSwappy_Case-Example')         # => 'sOMEsWAPPY-cASE_eXAMPLE'
LuckyCase.constantize('some_constant')                 # => SomeConstant
LuckyCase.constantize('SOME_CONSTANT')                 # => SomeConstant
LuckyCase.constantize('some/path_example/folder')      # => Some::PathExample::Folder
LuckyCase.deconstantize(SomeConstant)                  # => 'some_constant' // default case_type: :snake_case
LuckyCase.deconstantize(Some::PathExample::Folder, case_type: :camel_case)  # => 'some/pathExample/folder'

# identifiers
LuckyCase.case('this_can_only_be_snake_case')          # => :snake_case
LuckyCase.cases('validformultiple')                    # => [ :snake_case, :camel_case, :dash_case, :word_case ]

# checkers
LuckyCase.snake_case?('valid_snake_case')              # => true
LuckyCase.upper_snake_case?('UPPER_SNAKE')             # => true
LuckyCase.pascal_case?('PascalCase')                   # => true
LuckyCase.camel_case?('camelCase')                     # => true
LuckyCase.dash_case?('dash-case')                      # => true
LuckyCase.upper_dash_case?('DASH-CASE')                # => true
LuckyCase.train_case?('Train-Case')                    # => true
LuckyCase.word_case?('word case')                      # => true
LuckyCase.upper_word_case?('UPPER WORD CASE')          # => true
LuckyCase.capital_word_case?('Capital Word Case')      # => true
LuckyCase.sentence_case?('Sentence case string')       # => true
LuckyCase.mixed_case?('mixed_Case')                    # => true
LuckyCase.upper_case?('UPPER50984')                    # => true
LuckyCase.lower_case?('lower_cheese')                  # => true
LuckyCase.capital?('Some')                             # => true
LuckyCase.capitalized?('some')                         # => false
LuckyCase.decapitalized?('soMe')                       # => true
LuckyCase.not_capital?('Some')                         # => false
LuckyCase.valid_case_type?(:snake_case)                # => true
LuckyCase.valid_case_type?(:apple_case)                # => false
LuckyCase.valid_case_string?('validString')            # => true
LuckyCase.valid_case_string?('1nV4lid$tring')          # => false

Approach 2: Monkey patch the string class

With monkey patching you can access the same methods (except #deconstantize, #valid_case_type?) of LuckyCase directly from strings. Additionally they provide versions with exclamation mark for direct manipulation.

Because the methods #case and #cases are so general and could lead to conflicts, they are called #letter_case and #letter_cases at strings.

require 'lucky_case/string'

a = 'ExampleString'

a.pascal_case?                          # => true
a.snake_case                            # => 'example_string'
a                                       # => 'ExampleString'

# string variable manipulation
a.snake_case!                           # => 'example_string'
a                                       # => 'example_string'
...

# identifiers
# got a other method name here because 'case' might be to common and cause conflicts
b = 'example'
b.letter_case                           # => :snake_case
b.letter_cases                          # => [ :snake_case, :camel_case, :dash_case, :word_case ]

Installation

Add this line to your application's Gemfile:

gem 'lucky_case'

And then execute:

$ bundle install

Or install it yourself by:

$ gem install lucky_case

Documentation

Check out the doc at RubyDoc https://www.rubydoc.info/gems/lucky_case

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/magynhard/lucky_case. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.