Home » Modeling » TMF (Xtext) » formatting - help with issue
| formatting - help with issue [message #648394] |
Wed, 12 January 2011 17:20  |
 Henrik Lindberg
Messages: 2509
Registered: July 2009 |
Senior Member |
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This is a multi-part message in MIME format.
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Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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Hi,
I have a problem with formatting, that looks like formatter bug(s) to
me. The problem is that no formatting is applied.
This is the basic root rule of my grammar:
Manifest returns pp::Manifest
: {pp::Manifest}
statements += Expression*
;
(Expression is the top of a set of expression rules like
AdditiveExpression, MultiplicativeExpression etc. down to
PrimaryExpressions).
I have configured the formatter with a single rule and looked at the
debug graviz output. I tried two alternatives:
1. Using the statements assignment
c.setLinewrap().after(ga.getManifestAccess().getStatementsAs signment_2());
super.saveDebugGraphvizDiagram("debugDiagram.dot");
(this .dot output is attached)
2. Using the statements assignment's rule call
c.setLinewrap().after(ga.getManifestAccess().getStatementsEx pressionParserRuleCall_2_0());
super.saveDebugGraphvizDiagram("debugDiagram.dot");
In case 2, the diagram shows no signs of any formatting rules what so
ever (there is no {\n} marker by neither the "statements+=*"-node nor
the "=>Expression"-node's repeat arrow.
In case 1, the diagram shows a {\n} marker on the "=>Expression"-node's
repeat arrow.
The wanted linewrap is not inserted in either case.
I have debugged what is happening given the input:
$a = 1 $b = 2
Looking at the calls to collectLocators in the
FormattingConfigBasedStream I think that the linewrap rule should be
found when asking the matcher for matchNext when the element for the
variable "$b" is processed. Is this correct?
Greatful for any hints how to pinpoint what is wrong. I currently don't
understand what the cause is:
- is the rule recorded ok
- does it get the right tokens in the stream
- is the matching logic wrong
- etc.
I had a suspicion that the problem has to do with my handling of
whitespace (the grammar does not have hidden WS, instead it has a data
type rule called OWS (optional whitespace) that eats ws and comments.
If I try the input:
1 2
It parses ok (two literal integers).
The primary expression rule is something like
Literal : value = LITERAL_CHAR_SEQUENCE OWS
Both LITERAL_CHAR_SEQUENCE and OWS are data type rules.
And I can observe that writeSemantic is called with
LITERAL_CHAR_SEQUENCE RuleCall twice. Depending on if I use my
workaround to handle OWS as whitespace or not, there are calls to
writeSemantic with OWS (or not) after both literals. In both cases,
there is no matching taking place.
Hope someone has some hints...
Regards
- henrik
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Content-Type: text/plain; x-mac-type="0"; x-mac-creator="0";
name="debugDiagram.dot"
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filename="debugDiagram.dot"
## This is a Graphviz .dot file (http://www.graphviz.org/)
## You can use the command 'dot -Tpdf this.dot > out.pdf' to render it.
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| Re: formatting - help with issue [message #648455 is a reply to message #648394] |
Wed, 12 January 2011 23:07  |
Sebastian Zarnekow
Messages: 3118
Registered: July 2009 |
Senior Member |
|
|
Hi Henrik,
could you please file a ticket with a small language + formatter
attached to reproduce the problem. That would be helpful.
Thanks,
Sebastian
--
Need professional support for Eclipse Modeling?
Go visit: http://xtext.itemis.com
Am 12.01.11 18:20, schrieb Henrik Lindberg:
> Hi,
> I have a problem with formatting, that looks like formatter bug(s) to
> me. The problem is that no formatting is applied.
>
> This is the basic root rule of my grammar:
>
> Manifest returns pp::Manifest
> : {pp::Manifest}
> statements += Expression*
> ;
>
> (Expression is the top of a set of expression rules like
> AdditiveExpression, MultiplicativeExpression etc. down to
> PrimaryExpressions).
>
> I have configured the formatter with a single rule and looked at the
> debug graviz output. I tried two alternatives:
>
> 1. Using the statements assignment
> c.setLinewrap().after(ga.getManifestAccess().getStatementsAs signment_2());
> super.saveDebugGraphvizDiagram("debugDiagram.dot");
> (this .dot output is attached)
>
> 2. Using the statements assignment's rule call
> c.setLinewrap().after(ga.getManifestAccess().getStatementsEx pressionParserRuleCall_2_0());
>
> super.saveDebugGraphvizDiagram("debugDiagram.dot");
>
> In case 2, the diagram shows no signs of any formatting rules what so
> ever (there is no {\n} marker by neither the "statements+=*"-node nor
> the "=>Expression"-node's repeat arrow.
>
> In case 1, the diagram shows a {\n} marker on the "=>Expression"-node's
> repeat arrow.
>
> The wanted linewrap is not inserted in either case.
>
> I have debugged what is happening given the input:
> $a = 1 $b = 2
>
> Looking at the calls to collectLocators in the
> FormattingConfigBasedStream I think that the linewrap rule should be
> found when asking the matcher for matchNext when the element for the
> variable "$b" is processed. Is this correct?
>
> Greatful for any hints how to pinpoint what is wrong. I currently don't
> understand what the cause is:
> - is the rule recorded ok
> - does it get the right tokens in the stream
> - is the matching logic wrong
> - etc.
>
> I had a suspicion that the problem has to do with my handling of
> whitespace (the grammar does not have hidden WS, instead it has a data
> type rule called OWS (optional whitespace) that eats ws and comments.
>
> If I try the input:
> 1 2
> It parses ok (two literal integers).
>
> The primary expression rule is something like
> Literal : value = LITERAL_CHAR_SEQUENCE OWS
>
> Both LITERAL_CHAR_SEQUENCE and OWS are data type rules.
>
> And I can observe that writeSemantic is called with
> LITERAL_CHAR_SEQUENCE RuleCall twice. Depending on if I use my
> workaround to handle OWS as whitespace or not, there are calls to
> writeSemantic with OWS (or not) after both literals. In both cases,
> there is no matching taking place.
>
> Hope someone has some hints...
>
> Regards
> - henrik
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