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Xtext grammar [message #1735919]

Thu, 23 June 2016 15:52

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

Hi,

Can anyone tell me how to write terminal String to satisfy below declaration for string

"\9\9\9\9\9\9\9\9\9"

My terminal rule is:

terminal STRING : '"' ( '\\'('"'|('\r'? '\n')) | !('\n'|'"') )* '"' |
"'" ( '\\'("'"|('\r'? '\n')) | !('\n'|"'") )* "'";

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Re: Xtext grammar [message #1735923 is a reply to message #1735919]

Thu, 23 June 2016 16:09

Christian Dietrich

Messages: 13724
Registered: July 2009

Senior Member

are you sure this is a parsing problem and not a missing subclassing STRINGValueConverter problem?

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Re: Xtext grammar [message #1735924 is a reply to message #1735923]

Thu, 23 June 2016 16:15

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

This is parsing problem because if I write string like "\\9\\9\\9\\9\\9\\9\\9" it is parsing without error.

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Re: Xtext grammar [message #1735925 is a reply to message #1735924]

Thu, 23 June 2016 16:17

Christian Dietrich

Messages: 13724
Registered: July 2009

Senior Member

STRING value converters says \9 is an invalid escape sequence.
please debug org.eclipse.xtext.conversion.impl.STRINGValueConverter.convertFromString(String, INode)

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Re: Xtext grammar [message #1735926 is a reply to message #1735925]

Thu, 23 June 2016 16:21

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

Thanks

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Re: Xtext grammar [message #1736206 is a reply to message #1735926]

Mon, 27 June 2016 13:29

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

Hi,
I have written the below code back slash problem solved. But how replace all with [a-z] solved my problem? I just threw a stone for replace its working

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: Xtext grammar [message #1736210 is a reply to message #1736206]

Mon, 27 June 2016 13:46

Christian Dietrich

Messages: 13724
Registered: July 2009

Senior Member

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

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Re: Xtext grammar [message #1736326 is a reply to message #1736210]

Tue, 28 June 2016 12:40

Sachin Samaram

Messages: 271
Registered: April 2016

Senior Member

Sir could you please tell me how it is working?

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Re: Xtext grammar [message #1736332 is a reply to message #1736326]

Tue, 28 June 2016 13:08

Christian Dietrich

Messages: 13724
Registered: July 2009

Senior Member

i dont get your point

Xtext will call the STRINGValueConverter that is injected into DefaultValueConverterService thus you can subclass STRINGValueConverter

public class MySTRINGValueConverter extends STRINGValueConverter {
	
	@Override
	protected String convertFromString(String literal, INode node) throws ValueConverterWithValueException {
		// FIX impl here e.g. by copy paste adapt super impl
		return super.convertFromString(literal, node);
	}
	
	@Override
	protected String toEscapedString(String value) {
		// FIX impl here e.g. by copy paste adapt super impl
		return super.toEscapedString(value);
	}

}

and simply add a binding as you do it for 10000 stuff as well

    def Class<? extends STRINGValueConverter> bindSTRINGValueConverter() {
    	return MySTRINGValueConverter;
    }

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