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Escaping Strings in Xpand [message #531597]

Wed, 05 May 2010 13:52

Ralf Ebert

Messages: 168
Registered: July 2009

Senior Member

What's the best approach for escaping Strings in Xpand templates? (for example for
generating XML you have to quote <, >, & characters). Defining a Xtend function to include
a JAVA function that does the job? If so, is there maybe a set of common String escaping
functions available somewhere or does everybody write these themself?

- Ralf | http://www.ralfebert.de/

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Re: Escaping Strings in Xpand [message #531604 is a reply to message #531597]

Wed, 05 May 2010 14:15

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hello Ralf,

don't know of any built-in support in xpand. But StringEscapeUtils from Apache Commons Lang Supports such stuff.

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Escaping Strings in Xpand [message #531636 is a reply to message #531597]

Wed, 05 May 2010 16:10

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

Hi Ralf!

In Xpand you don't need to escape these characters. The only characters that need to be escaped are the guillemot brackets. Target XML code can be written as-is to the template.

~Karsten

Need professional support for Xtext, EMF, Eclipse IDE?
Go to: http://devhub.karakun.com
Twitter : @kthoms
Blog : www.karsten-thoms.de

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Re: Escaping Strings in Xpand [message #531639 is a reply to message #531604]

Wed, 05 May 2010 16:08

Ralf Ebert

Messages: 168
Registered: July 2009

Senior Member

> don't know of any built-in support in xpand. But StringEscapeUtils from
> Apache Commons Lang Supports such stuff.

Thanks,

String xml(String xml) : JAVA
org.apache.commons.lang.StringEscapeUtils.escapeXml(java.lan g.String);

does the trick. I guess there isn't a way to tell xpand to apply such a function for every
value that goes into the output document? (writing «somevalue.xml()» for each and every
value is redundant and errorprone as it might be forgotten failing only one day where you
have a '&' char in the model data)

- Ralf | http://www.ralfebert.de/

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Re: Escaping Strings in Xpand [message #531641 is a reply to message #531636]

Wed, 05 May 2010 16:19

Ralf Ebert

Messages: 168
Registered: July 2009

Senior Member

Hi Karsten,

> In Xpand you don't need to escape these characters. The only characters
> that need to be escaped are the guillemot brackets. Target XML code can
> be written as-is to the template.

but if the model data contains a '&' character, this needs to be escaped to & because
otherwise the XML document will be invalid, right?

- Ralf | http://www.ralfebert.de/

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