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Using Xtext reserved wording withing DSL [message #1792933]

Thu, 26 July 2018 07:22

Christoff Erasmus

Messages: 32
Registered: December 2016

Member

Hello.

Hoping for some advice please.

Currently I am trying to write rules to deal with "Compiler Directives" as defined here.

The basic layout is:
Quote:

'/' directive (directive_options)?

My one of my initial attempts:
>>Insert Screenshot of Grammar Snippet<<<
Quote:

CompilerDirectiveTITLE:
'/TITLE' name=ID
;
CompilerDirectiveEJECT:
{CompilerDirectiveEJECT}
'/EJECT'
;
CompilerDirectiveDEFINE:
'/DEFINE' name=ID
;
CompilerDirectiveUNDEFINE:
'/UNDEFINE' name=ID
;
CompilerDirectiveEOF:
{CompilerDirectiveEOF}
'/EOF'
;

The issue::
When trying to specify the "EOF" directive, the grammer does not compile.
>>>Insert Screenshot of EOF directive<<<

CompilerDirectiveEOF:
	{CompilerDirectiveEOF}
	'/EOF'
;

>>>Insert Screenshot of MWE2 Error<<<

Parser.g:104:3: The following alternatives can never be matched: 2

Request:
Is it possible to have '/EOF' in the DSL?

EDIT:
Seems that Images are not being uploaded. Replaced with code snippet.

Attachment: CompilerDirectiveGrammerSnipet.PNG
(Size: 11.28KB, Downloaded 68 times)

[Updated on: Thu, 26 July 2018 07:32]

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Re: Using Xtext reserved wording withing DSL [message #1792935 is a reply to message #1792933]

Thu, 26 July 2018 07:27

Christian Dietrich

Messages: 14590
Registered: July 2009

Senior Member

hi, please provide a minimal grammar and testmodel showing your problem

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

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Re: Using Xtext reserved wording withing DSL [message #1792936 is a reply to message #1792935]

Thu, 26 July 2018 07:34

Christoff Erasmus

Messages: 32
Registered: December 2016

Member

Christian Dietrich wrote on Thu, 26 July 2018 07:27

hi, please provide a minimal grammar and testmodel showing your problem

Done, please refer to the first post.
Edits made, as screenshots did not upload during initial post.

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Re: Using Xtext reserved wording withing DSL [message #1792938 is a reply to message #1792936]

Thu, 26 July 2018 07:43

Christian Dietrich

Messages: 14590
Registered: July 2009

Senior Member

i want i minimal grammar i can simply c&p & run.

the grammar

CompilerDirectiveEOF:
	{CompilerDirectiveEOF}
	'/EOF'
;

works fine

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

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Re: Using Xtext reserved wording withing DSL [message #1792946 is a reply to message #1792938]

Thu, 26 July 2018 09:28

Uli Merkel

Messages: 250
Registered: June 2013

Senior Member

isn't it just that (according to the PNG: "CompilerDirectiveEOF hidden():")

there is a hidden() which is not mentioned in this conversation so far?

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Re: Using Xtext reserved wording withing DSL [message #1792958 is a reply to message #1792946]

Thu, 26 July 2018 13:46

Christoff Erasmus

Messages: 32
Registered: December 2016

Member

Thanks for the responses.

It seems that the problem is related to making the DSL case insensitive. By adding the "ignoreCase = true" to the parseGenerator.

		language = StandardLanguage {
			name = "org.xtext.example.directivedsl.DirectiveDSL"
			fileExtensions = "dirdsl"

			serializer = {
				generateStub = false
			}
			validator = {
				// composedCheck = "org.eclipse.xtext.validation.NamesAreUniqueValidator"
			}
			junitSupport = {
				junitVersion = "5"
			}
			parserGenerator = {
//				debugGrammar = true
				options = {
					ignoreCase = true
				}
			}
//			scopeProvider = {
//				ignoreCase = true
//			}
		}

I created a temp GitHub repo for the language.
To for easier C&C (or Clone) and running.
Quote: