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Bug 347896 - FileNotFound exception during generation
Summary: FileNotFound exception during generation
Status: RESOLVED WORKSFORME
Alias: None
Product: TMF
Classification: Modeling
Component: Xtext Backlog (show other bugs)
Version: unspecified   Edit
Hardware: PC Windows XP
: P3 normal (vote)
Target Milestone: ---   Edit
Assignee: Project Inbox CLA
QA Contact:
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2011-06-01 05:32 EDT by Cedric Moonen CLA
Modified: 2016-08-17 06:59 EDT (History)
4 users (show)

See Also:

Attachments
Errors and exception call stack (4.12 KB, text/plain)
2011-06-01 05:34 EDT, Cedric Moonen CLA 		no flags Details
Complete grammar (1.66 KB, text/plain)
2011-06-01 06:14 EDT, Cedric Moonen CLA 		no flags Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description Cedric Moonen CLA 2011-06-01 05:32:47 EDT 
Build Identifier: I20110512-2000

I am currently trying Xtext 2 (nightly builds:   2.0.0.v201105310915).

I have the following grammar element (not complete):

Module_Impl returns Module:
	'package' package=EString
	'Module' name=ID
	'{'
		(commands+=Command)*
	'}'
	((exposedInterfaces+=EventInterface)* &
	(errors+=Error)* &
	(dataTypes+=DataType)*);

When I run the workflow to generate the code for this grammar, the following error occurs in the console (see attachment 1 [details])

If I remove the parentheses in my grammar:
Module_Impl returns Module:
	'package' package=EString
	'Module' name=ID
	'{'
		(commands+=Command)*
	'}'
	(exposedInterfaces+=EventInterface)* &
	(errors+=Error)* &
	(dataTypes+=DataType)*;

Then no exception occurs but I still have those errors:
warning(200): ../be.picanol.moduleDSL.xtext.pm.ui/src-gen/be/picanol/moduleDSL/xtext/pm/ui/contentassist/antlr/internal/InternalModule.g:2893:45: Decision can match input such as "'error' RULE_ID" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
Semantic predicates were present but were hidden by actions.
warning(200): ../be.picanol.moduleDSL.xtext.pm.ui/src-gen/be/picanol/moduleDSL/xtext/pm/ui/contentassist/antlr/internal/InternalModule.g:2915:48: Decision can match input such as "'dataType' RULE_ID" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
Semantic predicates were present but were hidden by actions.

Removing the '&' characters solves all errors. This grammar was producing no errors with Xtext 1.0.1


Reproducible: Always
Comment 1 Cedric Moonen CLA 2011-06-01 05:34:08 EDT 
Created attachment 197073 [details]
Errors and exception call stack
Comment 2 Moritz Eysholdt CLA 2011-06-01 05:37:55 EDT 
sounds like your grammar is ambiguous. Could you attach the complete grammar?
Comment 3 Cedric Moonen CLA 2011-06-01 06:14:36 EDT 
Created attachment 197078 [details]
Complete grammar
Comment 4 Cedric Moonen CLA 2011-06-01 06:16:15 EDT 
(In reply to comment #2)
> sounds like your grammar is ambiguous. Could you attach the complete grammar?

This grammar was working fine with Xtext 1.0 (it's still work in progress but no errors were generated and I had an editor for it).
Comment 5 Sebastian Zarnekow CLA 2011-06-01 08:56:08 EDT 
I cannot reproduce the problem with your grammar (modified it to use a generated metamodel instead of an imported metamodel).
Comment 6 Sebastian Zarnekow CLA 2011-06-01 08:57:47 EDT 
I did not recognize that the attached grammar does not use unordered groups. Will try again ...
Comment 7 Sebastian Zarnekow CLA 2011-06-01 09:16:57 EDT 
I can reproduce the issue with a simplified version of the grammar:

grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals

generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"

Model:
	(
		(a+=A)* &
		(b+=B)* &
		(c+=C)*
	);

A:
  'a' name=ID;

B:
  'b' name=ID;
  
C:
  'c' name=ID;
Comment 8 Sebastian Zarnekow CLA 2011-06-01 09:23:56 EDT 
Note that the simplified example leads to warnings instead of errors thus the FileNotFoundException does not occur. However, it should not lead to warnings in the generated parsers.
Comment 9 Sven Efftinge CLA 2011-09-26 09:14:23 EDT 
not 2.1
Comment 10 Christian Dietrich CLA 2016-08-17 06:59:13 EDT 
can no be reproduced with xtext 2.8.4 (old workflow) and xtext 2.10 (new workflow)