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disable mandatory whitespaces at certain positions [message #1734332]

Tue, 07 June 2016 09:02

Jonathan L.

Messages: 24
Registered: May 2016

Junior Member

Hi,

I got the following rule in a grammar

WCLOCKK:
	'await' (INT 'h')? (INT 'min')? (INT 's')? (INT 'ms')? (INT 'us')?
;

which allows code like this:

await 1h 23min 5s 42ms 2us

If I delete the whitespaces between the elements errors occur.
Is it possible to make the whitespaces unnecessary without losing functionality?

Thanks in advance

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Re: disable mandatory whitespaces at certain positions [message #1734334 is a reply to message #1734332]

Tue, 07 June 2016 09:10

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

hi this is a lexer problem.
thus without solving the lexer problem - no

to solve it

(a) reduce id and introduce a datatype rule

WCLOCKK:
	'await' (INT 'h')? (INT 'min')? (INT 's')? (INT 'ms')? (INT 'us')?
;

terminal ID  		: '^'?('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_')*;

MyID : ID (INT|ID)*;

(b) use a custom lexer

(c) backtrack the lexer

parserGenerator = {
options = {
backtrackLexer = true
}
}

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

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