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Backslash in string [message #876959]

Fri, 25 May 2012 15:43

Bryce Brinkley

Messages: 8
Registered: October 2011

Junior Member

Hello Xtext community!

I'm trying to define a terminal rule which allows strings to contain single backslashes, but with no success so far...
Example token: "c:\some\windows\path\file.txt"

This seems to be a logical solution for me

terminal STRING returns ecore::EString:
	'"' (!'"')* '"';

or also this

terminal STRING returns ecore::EString:
	'"' -> '"';

However when parsing an example file I'm getting the following error:

Error at line 7 at '"D:\myFolder123\ELMN.ed"': Illegal escape character \m

Could anybody give me a hint how to handle the \ character?
Your help is greatly appreciated!

Bryce

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Re: Backslash in string [message #876976 is a reply to message #876959]

Fri, 25 May 2012 16:05

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi you need a custom value converter (or simply use double back
slashes as usual in java)

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

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Re: Backslash in string [message #876980 is a reply to message #876959]

Fri, 25 May 2012 16:08

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Hi Bryce,

you have to register a value converter for your variant of STRING.
Please refer to the docs for details on value conversion.

Regards,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com

Am 25.05.12 17:43, schrieb Bryce Brinkley:
> Hello Xtext community!
>
> I'm trying to define a terminal rule which allows strings to contain
> single backslashes, but with no success so far...
> Example token: "c:\some\windows\path\file.txt"
>
> This seems to be a logical solution for me
> terminal STRING returns ecore::EString:
> '"' (!'"')* '"';
> or also this
> terminal STRING returns ecore::EString:
> '"' -> '"';
> However when parsing an example file I'm getting the following error:
> Error at line 7 at '"D:\myFolder123\ELMN.ed"': Illegal escape character \m
>
> Could anybody give me a hint how to handle the \ character?
> Your help is greatly appreciated!
>
> Bryce

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Re: Backslash in string [message #1736205 is a reply to message #876980]

Mon, 27 June 2016 13:26

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

class CustomTerminalConverters extends DefaultTerminalConverters {
@Inject
private STRINGValueConverter stringValueConverter;

@ValueConverter(rule = "STRING")
override IValueConverter<String> STRING() {
return stringValueConverter;
}
}
class STRINGValueConverter extends AbstractLexerBasedConverter<String> {

override toValue(String string, INode node) throws ValueConverterException {
println("String value converter is called::::::::::::::::::"+node+" :::: "+string)
return string.replaceAll("[a-z]", "");
}

}

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Re: Backslash in string [message #1736209 is a reply to message #1736205]

Mon, 27 June 2016 13:45

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

simply subclass STRINGValueConverter and add a binding for STRINGValueConverter to your subclass should be enhough

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

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