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How can I override STRING? [message #1831536]

Sat, 22 August 2020 06:13

David Sun

Messages: 12
Registered: July 2020

Junior Member

In my project,I need override STRING. I'm going to replace double quotes with single quotes.(eg: 'helloworld')
I tried to write a rule, but I failed!
index.php/fa/38803/0/

Can anyone help me ??

Thanks a lot!

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Re: How can I override STRING? [message #1831539 is a reply to message #1831536]

Sat, 22 August 2020 08:15

Christian Dietrich

Messages: 13721
Registered: July 2009

Senior Member

the .? makes no sense. its just one char.
is there any reason you don use -> as in the comment rule or just copy the one half of the overriden STRING rule from terminals?

"'" ( '\\' . /* 'b'|'t'|'n'|'f'|'r'|'u'|'"'|"'"|'\\' */ | !('\\'|"'") )* "'

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Re: How can I override STRING? [message #1831543 is a reply to message #1831539]

Sat, 22 August 2020 10:29

Ed Willink

Messages: 6993
Registered: July 2009

Senior Member

Hi

You partially override builtins by deleting the grammar 'inheritance' from org.eclipse.xtext.common.Terminals.

You can then duplicate as much of org.eclipse.xtext.common.Terminals as you want in your own grammar with whatever changes you feel appropriate.

However this is only a partial override since beware that certain terminal such as ID have built-in functionality.

Regards

Ed Willink

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