Comments on: Scala Goodness: RichString

By: stephan

stephan — Mon, 01 Feb 2010 16:15:13 +0000

I still don’t get it :-)

By: Peter

Peter — Mon, 01 Feb 2010 15:01:54 +0000

Thanks Erik. So the only overhead is a leading “” and a trailing “.text”. I can live with that.

scala> val n = “stephan”
n: java.lang.String = stephan

scala> val s = hello {n}.text
s: String = hello stephan

scala> println(s)
hello stephan

By: stephan

stephan — Thu, 21 Jan 2010 13:40:46 +0000

@Erik: Could you paste to pastebin or something? Would really learn this, I’m to stupid to follow you :-)

By: Tyro

Tyro — Wed, 20 Jan 2010 18:33:37 +0000

Erik – that trick is kind of neat. Right now it feels too “clever” but I’ll try it out on a couple friends and see what they think. If it flies, it comes close to giving me a real GString which would be wonderful.

By: Erik van Oosten

Erik van Oosten — Wed, 20 Jan 2010 14:33:34 +0000

Stephan, no no. The “<[[CDATA" is completely non-valid XML (valid XML requires a closing "]]>”), it is just a string. I put it in there to emphasize that it is not valid XML.

By: stephan

stephan — Wed, 20 Jan 2010 13:22:07 +0000

Hmm. “any String works” => “any String works which escapes everything with a CDATA command to make it XML” ?

Would be like GStrings if this would work:

scala> val n = “stephan”
n: java.lang.String = stephan

scala> val s = “hello {n}”
s: java.lang.String = hello {n}

(But nice to know the CDATA trick, although it is ugly it might come in handy sometimes)

By: Erik van Oosten

Erik van Oosten — Wed, 20 Jan 2010 12:55:36 +0000

Stephan, any string works. It does /not/ have to be valid XML:

scala> val n = “<[[CDATA My name is invalid XML & n: java.lang.String = <[[CDATA My name is invalid XML &

scala> ~~Hello { n }!~~.text
res3: String = Hello <[[CDATA My name is invalid XML &

scala>

(This is my last attempt to find out the right escaping.)

By: Erik van Oosten

Erik van Oosten — Wed, 20 Jan 2010 12:52:35 +0000

Stephan, any string works. It does /not/ have to be valid XML:

scala> val n = “<[[CDATA My name is invalid XML & ~~Hello { n }!~~.text
res3: String = Hello <[[CDATA My name is invalid XML &

By: Erik van Oosten

Erik van Oosten — Wed, 20 Jan 2010 12:50:48 +0000

Stephan, any string works. It does /not/ have to be valid XML:

scala> val n = “<[[CDATA My name is invalid XML & n: java.lang.String = My name is invalid XML & Hello { n }!.text
res1: String = Hello <[[CDATA My name is invalid XML &

~~scala>~~

By: stephan

stephan — Wed, 20 Jan 2010 12:41:09 +0000

@Erik: Agreed, when the content is valid XML one can use XML literals for “GStrings”, would be nice to have real ones though, not everything I do is HTML ;-)

By: Erik van Oosten

Erik van Oosten — Wed, 20 Jan 2010 12:36:56 +0000

Scala has GStrings! Well, almost. Here we go:

scala> val n = “name”
n: java.lang.String = name

scala> ~~Hello { n }!~~.text
res0: String = Hello name!

scala>