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RPGLE - String Literal Parsing [message #1791986]

Mon, 09 July 2018 11:01

Christoff Erasmus

Messages: 32
Registered: December 2016

Member

I would like to be able to correctly parse strings as defined for the RPGLE language.

Attached are some example strings that I would like to be able to parse.

Request:
Please help me, work out the logic to correctly parse the example strings attached.

This issues I am encountering relates to the following:

Issue 1 - Escape Characters:

Strings Literals are contained in single quotes, 'I am a Simple String'
Strings with nested quotes are escaped with another single quote. 'I have a nested '' in me'
No other escape characters allowed

Issue 2 - String Literal Continuation:

For character, date, time, and timestamp literals :

A hyphen (-) indicates continuation is in the first available position in the continued field (=> Aka Blanks Honored)
A plus (+) indicates continuation with the first non-blank character in or past the first position in the continued field (=> Aka Blanks NOT Honored)

References
IBM Knowledge Center - Continuation Rules for RPGLE

Attachment: StringExamples.PNG
(Size: 30.31KB, Downloaded 104 times)
Attachment: StringExamples.txt
(Size: 0.78KB, Downloaded 96 times)

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Re: RPGLE - String Literal Parsing [message #1791988 is a reply to message #1791986]

Mon, 09 July 2018 11:20

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

for (1) since you share nothing with us i am not sure what you expect what did you try? e.g. the most naive thing

terminal STRING:
	"'" (!"'"|"''")* "'"
;

is (2) not a value converter thingy (so should not be treated in the parser itself

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

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Re: RPGLE - String Literal Parsing [message #1792002 is a reply to message #1791988]

Mon, 09 July 2018 15:53

Christoff Erasmus

Messages: 32
Registered: December 2016

Member

Thanks for the help.

For my future self:
https://www.eclipse.org/forums/index.php?t=msg&th=1078680&goto=1736332&#msg_1736332
https://www.eclipse.org/forums/index.php?t=msg&th=170689&goto=542524&#msg_542524
http://pettergraff.blogspot.com/2009/11/xtext-valueconverter.html

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