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need to accept backslashes in the language [message #872000]

Tue, 15 May 2012 09:20

Tim Student

Messages: 12
Registered: May 2012

Junior Member

Hi guys,

first, here comes my little excerpt of code:

Input hidden():	'input' (WS '-s' WS VARIABLE)? WS value+=STRING+

This will support things like

input 		 "String0" "String1" "String2"

input -s $var 	 "String0" "String1" "String2"

In my given language, we support things like:

input 		 "String0" \
		 "String1" \
		 "String2"

input -s $var 	 "String0" \
		 "String1" \
		 "String2"

to make the code better readable. The backslash sign is the marker, to tell my compiler, to continue reading in the next line (physically it escapes the <newline> character for my private parser).
How can I support this to be recognized by my Xtext grammar? I tried to define a Terminal Rule and try to hide that within the rule like this:

terminal BS   : '\\';

Input hidden(BS):	'input' (WS '-s' WS VARIABLE)? WS value+=STRING+

but it does not work....
Does anybody have an Idea?

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Re: need to accept backslashes in the language [message #872009 is a reply to message #872000]

Tue, 15 May 2012 09:43

Phil R

Messages: 99
Registered: September 2011

Member

HI,

try with a unicode:

Input hidden(): 'input' (WS '-s' WS VARIABLE)? WS value+=STRING ('\u005C' EOL value+=STRING)*

-Phil

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Re: need to accept backslashes in the language [message #872128 is a reply to message #872009]

Tue, 15 May 2012 14:06

Tim Student

Messages: 12
Registered: May 2012

Junior Member

Thanks, that fixed it!
/tim

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