Stratego Release 063
Stratego -- Strategies for Program Transformation
Available from
StrategoDownload
New features
Release Announcement
Version 0.6.3
released: November 26, 2001
SUMMARY OF CHANGES
(with respect to release 0.6)
* BuildSplit syntax generalizes split
* MatchProject syntax generalizes projection
* New library strategies
* Tracing of evaluation
* Several bug repairs
* Anonymous CVS checkout is possible again
* Website runs new twiki
INSTALLATION NOTE
* Configuration with the default prefix flag does not work properly.
If installing at /usr/local, configure explicitly as follows:
configure --prefix=/usr/local
CONTRIBUTIONS
* Bug reports by Otto Skrove Bagge, Robert Feldt (configuration),
Merijn de Jonge (strings & #), Hedzer Westra
* Bug repairs by Merijn de Jonge (strings & #)
* Library contributions by Otto Skrove Bagge (insert)
* CVS support: Henk van Lingen
* Web hosting: Henk Penning
LANGUAGE
* Term patterns can contain strategy applications <s>.
* Build-Split patterns simplify wrapping some complex constructor pattern
around a term. For instance, split(f,g) can now be written as
!(<f>,<g>), and this generalizes to arbitrary build patterns.
* Match-Project patterns simplify projection of sub-terms. A strategy
application <s> inside a match pattern selects the corresponding sub-term
and applies s to it. For example, instead of writing
\ Typed(Var(x),_) -> x \ it is now possible to write ?Typed(Var(<id>),_)
This feature can also be used to perform tests on subterm in a
match pattern, e.g., the pattern ?[x | <not([])>] binds the head of a list
to x, checks that the tail is not empty and produces the tail as
result.
COMPILER
* Added compile time option to generate code to trace strategies
- --trace-all: trace all strategies
- -t f: trace strategy f
- Note: -t option does not work properly yet.
* Optimization is set to O2 by default (used to be O4). The higher
optimization level (which comes down to inlining functions in addition
to the O2 optimizations) seems to produce faulty code on some
machine/compiler combinations. Optimization can be increased by
passing the option -CI "O3" to SC. However, it seems appropriate to
leave inlining decisions to SC.
* Repair in implementation of dynamic rules; added rule stamp in order
to record to which rule the information belongs.
* Repair of compilation of overlays
LIBRARY
* Repair of term explosion for strings (Merijn de Jonge). Quoted
identifiers (strings) can now be used as constructor symbols.
Not yet supported in signatures.
* Type annotations added to strategy operators with higher-order
arguments.
* Numerous small refactorings.
* Some new tests
* New
- occurrences(s): all occurrence for which s succeeds
- om-occurrences(s): outermost occurrences only
- collect-all(s): collect all occurrences
- collect-om(s): collect outermost occurrences only
* Obsolete:
- collect-kids/1 -> crush/3
DISTRIBUTION
* The Stratego CVS repository is accessible again. To check out the contents
of the repository type:
cvs -d :pserver:anonymous@cvs.cs.uu.nl:/data/cvs-rep checkout Stratego
Thanks to Henk van Lingen for setting up the cvs server.
* If you would like to get involved in development of the compiler or library,
it is also possible to obtain write access to the repository. Contact me
if you're interested.
WEBSITE
* The twiki running the website has moved from losser to the production server
of the Utrecht University CS department. Thanks to Henk Penning for making
this possible. Individual pages are now bookmarkable under the
stratego-language.org URL. Access control has been improved. Users need to
re-register to enter a password.