Sergey,
As I understand, this does means nothing for the QVTo project. I
understand that Ed is trying to obtain LPG grammars from the Xtext
one (which are used for the pivot-based implementation's parser,
which is not exploited by QVTo, AFAIK). To do that, it looks like he
is using a serie of QVTo transformations.
As long as QVTo parser extends the classic OCL LPG grammars (from
org.eclipse.ocl.ecore plugin) QVTo project won't have to worry about
these activities
Cheers,
Adolfo.
El 01/03/2012 16:51, Sergey Boyko escribió:
Hi Ed,
Could you please describe in more details what is "Xtext to LPG"
means for QVTo. Could you please point me where QVTo *.xtex is
persisted?
About QVTo statndalone execution; look at http://wiki.eclipse.org/M2M/QVTO/New_and_Noteworthy/Helios#Milestone_5
Regards,
Sergey
On Wed, Feb 29, 2012 at 11:56 AM, Ed
Willink <ed@xxxxxxxxxxxxx>
wrote:
Hi
I made a relatively small Xtext grammar change and suddenly
got stupid syntax errors, probably because a magic
backtracking precedence flipped. I therefore started updating
the 'equivalent' LPG grammar to look for a conflict and
realized that the time had come to look at automated Xtext to
LPG conversion; it's relatively easy.
I've therefore developed/am developing a Tx cascade
QVTo: *.xtext -> *.xtext.XBNF to get a fully referential
EBNF model from the Xtext CST
QVTo: *.xtext.XBNF -> *.xtext.normal.XBNF to convert to a
disjunct of conjuncts BNF
QVTo: *.normal.XBNF -> *.inline.XBNF to re-inline
non-recursive references that were originally from a single
rule
Acceleo: *.inline.XBNF -> *.g, *.gi
(XBNF is Xtext BNF, i.e BNF with model annotations)
Currently plausible KWLexer and Parser grammars are generated,
Lexer still todo; the Xtext and LPG styles are very different.
Action code still to do; should be easy with all the model
annotations.
Unfortunately there is no QVTo standalone support so I also
had to develop that and the corresponding MWE integration.
The build scripts are in the build plugin. The transformations
in the examples.xtext2lpg plugin.
Since only the build plugin has QVTo dependencies and neither
of the above plugins are in the Tools build, I don';t think
that there is any releng impact.
Regards
Ed Willink
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