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Using until operator without consuming the last token [message #1635382]

Wed, 25 February 2015 19:27

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi guys,

I am using the until token but I would like to get a different behaviour , my terminal is the following

terminal UNQUOTED_STRING:
!('$'|'&'|'*'|'#'|'{'|'}'|'['|']'|'%'|'^'|'='|'('|')'|'`'|'@'|' '|'\t') -> ('.'|'@('|')'|':'|','|'\r'|'\n'|']'|'}');

The idea is to consume unquoted string with spaces however the until operator consume the last token and I want to avoid that.

Do you know a way of doing this or any idea about how to solve this?

Regards,
Luis

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Re: Using until operator without consuming the last token [message #1636421 is a reply to message #1635382]

Thu, 26 February 2015 07:16

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

HI,

i cannot answer this question but did you ever consider to use a "handmade" custom / external lexer?

Regards
Christian

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

[Updated on: Thu, 26 February 2015 07:17]

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Re: Using until operator without consuming the last token [message #1636848 is a reply to message #1636421]

Thu, 26 February 2015 12:03

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi Christian,

Currently I am using Xtext to generate the lexer and parser and then I am doing some "hacks" in order to achieve the grammar that I want, anyway I always try to use text before customise my lexer.

Reards,
Luis

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Re: Using until operator without consuming the last token [message #1636944 is a reply to message #1636848]

Thu, 26 February 2015 13:05

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

another question: does it have to be a terminal? maybe a Dataype Rule + A rule for alpabetic chars that are not in ID may help as well

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

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Re: Using until operator without consuming the last token [message #1647600 is a reply to message #1636944]

Tue, 03 March 2015 14:12

Luis De Bello

Messages: 95
Registered: January 2015

Member

Hi Christian,

I was able to solve my problem changing my terminal

Original version:
terminal UNQUOTED_STRING:
!('$'|'&'|'*'|'#'|'{'|'}'|'['|']'|'%'|'^'|'='|'('|')'|'`'|'@'|' '|'\t') -> ('.'|'@('|')'|':'|','|'\r'|'\n'|']'|'}');

New version:
terminal UNQUOTED_STRING:
!('$'|'&'|'*'|'#'|'{'|'}'|'['|']'|'%'|'^'|'='|'('|')'|'`'|'@'|' '|'\t') !('.'|'@('|')'|':'|','|'\r'|'\n'|']'|'}')*;

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