How to camelCase a String in Pharo?
Question
I'm trying to get from:
'hello how are you today'
to
'helloHowAreYouToday'
And I thought asCapitalizedPhrase asLegalSelector
would do the trick, but it doesn't.
What's the proper way to do this?
EDIT:
I think I should clarify my question; I already have a way to transform a string into a camelCase selector:
|aString aCamelCaseString|
aString := aString findTokens: $ .
aCamelCaseString := aString first.
aString allButFirst do: [:each | aCamelCaseString := aCamelCaseString , each capitalized].
I was just wondering whether Pharo has a standard system method to achieve the same :)
Solution
You don't say which version of Pharo you're using, but in the stable 5.0,
'hello world this is a selector' asCamelCase asValidSelector
yields
helloWorldThisIsASelector
To get what I'm using run:
curl get.pharo.org/50+vm | bash
OTHER TIPS
How about this?
| tokens |
tokens := 'this is a selector' findTokens: Character space.
tokens allButFirst
inject: tokens first
into: [:selector :token | selector, token capitalized]
I don't think there's an existing method doing this.
Here's an implementation that solves your problem:
input := 'hello how are you today'.
output := String streamContents: [ :stream |
| capitalize |
capitalize := false.
input do: [ :char |
char = Character space
ifTrue: [ capitalize := true ]
ifFalse: [
stream nextPut: (capitalize
ifTrue: [ char asUppercase ]
ifFalse: [ char ]).
capitalize := false ] ] ].
Edit: note, in comparison to Frank's solution this one is longer but it does not break for empty input and it does not create a new string instance for each step since it streams over the input, which is more efficient (in case you have large strings).
I know this is old but Squeak has a useful implementation (String>>asCamelCase) which basically does this:
(String
streamContents: [:stream | 'hello world' substrings
do: [:sub | stream nextPutAll: sub capitalized]]) asLegalSelector