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Xtend, rich strings and SEPARATOR option [message #876315]

Thu, 24 May 2012 11:05

Aran A

Messages: 30
Registered: January 2011

Member

Hello,

In a previous post I have seen this code with rich strings

toString(Entity e) '''
«e.name»
«FOR member: e.members BEFORE "(" SEPARATOR "," AFTER ")"»
«member.toString»
«ENDFOR»
'''

The result will be the members separated by commas, in parentheses. If there
are no members, there won't be parentheses.

OK, but how can I do if I have a conditional inside the FOR?, as in the example:

toString(Entity e) '''
«e.name»
«FOR member: e.members BEFORE "(" SEPARATOR "," AFTER ")"»
«IF (a condition...)»«member.toString»«ENDIF»
«ENDFOR»
'''

Then, the result could be something like: m1, , , , m5, m6, m7, , , , , , m13,
How can I do if I want a result will be m1, m5, m6, m7, m3 ? Do I have to work it by hand?

Thanks in advance,

Aran

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Re: Xtend, rich strings and SEPARATOR option [message #876379 is a reply to message #876315]

Thu, 24 May 2012 13:36

Christian Dietrich

Messages: 13493
Registered: July 2009

Senior Member

What about wrapping it into an extra extension using map and filter?

e.g.

toString(Entity e) '''
«e.name»
«FOR member: e.members.filter(m|a condition) BEFORE "(" SEPARATOR "," AFTER ")"»
«member.toString»
«ENDFOR»
'''

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Thu, 24 May 2012 18:08]

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