Well I got the Exceptions, with regard to the comments in my grammar, to
disappear.
I changed my comment grammar from
LINE_COMMENT
: (';' | '!') ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
to
LINE_COMMENT
: (';' | '!') ~('\n'|'\r')* '\r'? '\n' {skip();}
;
Exceptions gone. I guess that'll work for now.
- Darin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Mikesell, Darin B.
Sent: Wednesday, June 30, 2010 2:31 PM
To: [email protected]
Subject: [antlr-interest] Bug or Error
I have an interesting error/bug that just started coming up.
First here's a description of the bug. If I enter a Line Comment, then the
next keyword that is encountered (however many lines below that comment) will
seem to have its first letter incorrectly 'read'. If I enter a 2nd or 3rd line
of comments after that 1st comment, then the 2nd and 3rd letter of that same
keyword will not be 'read'. When I say 'read', I mean to say that the word
will have its 1st-3rd letter grayed out, almost like it was considered still
part of the comment(s) from the line above.
The weird part is that everything seems to run fine (i.e. the parse tree builds
correctly), other than the Exception below being thrown if enough comments are
read as to gray out the entire keyword. Here's the other kicker, I only get
the Exception being thrown if I debug from an input file... if I copy/paste the
data from the file into the Text window and debug, the Exception never gets
thrown.
The interesting part is that I never received this Exception being thrown
before, it just started coming up. I've been testing this grammar for about a
week and then just yesterday this Exception starting popping up. The only
thing that I can recall doing that may have caused it was that I clicked on the
Refactor, Remove All Left Recursion.
I wish I was using versioning software, so I can just revert, but I don't think
that would help anyway because the Exception is still being thrown even when I
run the example grammars (the comments in the example grammars are having the
same effect).
I'm using ANTLRWorks 1.4 I've tried deleting and reinstalling (including
deleting the registry keys) to no avail.
I've tried using Java 1.5 and Java 1.6 and it doesn't matter, the Exception
still gets thrown.
Here is a subset of my language, I've broken it down to its smallest possible
pieces for the debugging purposes I was performing, and have determined (as
stated above) that the Exceptions seem to be caused by the comments section.
grammar myLang;
my_program
: 'begin'
statement+
'end'
;
// S t a t e m e n t s
statement
: print_statement
;
print_statement
: 'print' STRING_LITERAL
;
STRING_LITERAL
: '"' ( ~('\\'|'"') )* '"'
;
WS
: (' '|'\t'|'\u000C'|'\r'|'\n') {$channel=HIDDEN;}
;
LINE_COMMENT
: (';' | '!') ~('\n'|'\r')* '\r'? '\n' {$channel=HIDDEN;}
;
Here is the input program that I'm using:
begin
; Comment Line 1
; Comment Line 2
; Comment Line 3
; Comment Line 4
; Comment Line 5
; Comment Line 6
print "This is a test print statement"
end
Here is the exception that is being thrown:
[14:19:10] javax.swing.text.BadLocationException: Position not represented by
view
at javax.swing.text.CompositeView.modelToView(Unknown Source)
at javax.swing.text.BoxView.modelToView(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI$RootView.modelToView(Unknown
Source)
at javax.swing.plaf.basic.BasicTextUI.modelToView(Unknown Source)
at javax.swing.plaf.basic.BasicTextUI.modelToView(Unknown Source)
at javax.swing.text.JTextComponent.modelToView(Unknown Source)
at
org.antlr.works.debugger.input.DBInputProcessorToken$1.run(DBInputProcessorToken.java:304)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Any advice would be greatly appreciated.
- Darin
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