Xotcl March 2002

xotcl@alice.wu.ac.at

7 participants
7 discussions

results of the poll
by Gustaf Neumann 22 Apr '02

22 Apr '02

Dear XOTcl community, the results of the poll can be summarized as follows: - most people favored "names" instead of "symbols" for "selfDispatch" - the hottest favorite is "my". One can write now ... my instvar a b c my log ... instead of ... [self] instvar a b c [self] log ... the variant with [self] will continue to work forever.. If someone is not happy with "my", please react soon. From the "volatile" front: we have now more-or-less Zoran suggestion implemented in C. Actually there is no need in general for using tcl-variables to implement volatile objects (we could handle this on a pop of stack frames), but at least for pure tcl-procs, var traces are the simplest implementation. The current implementation (purely in C) works as part of the "new" method: a) Object new ... b) Object new -childof ... c) Object new -volatile ... d) Object new -volatile -childof ... (a) creates "global" objects, not in the global namespace anymore, but in xotcl. (b) can be used to create objects as child of other objects (e.g. [self], the objects are deleted, when the specified object is deleted), (c) are "global" objects as in (a), but they are deleted, when the current tcl-proc/object-proc/instproc is left, and (d) is a combination of b and c. Needless to say, a-d works for classes as well as e.g. Class new -volatile in order to create "anonymoes" classes. The implementation of new is slightly faster than before, since i changed the nameing schema to be the same for all kind new ("__#122", ...), such that e.g. [Class new -volatile] new -volatile works as well. the disadvantage is that the neat classname derived names as in earlier versions have to be done by hand now... that was it for now best regrads -gustaf

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xotcl 0.9 for linux debian
by Catherine Letondal 28 Mar '02

28 Mar '02

Dear XOtcl list, I have some problems to install the latest xotcl version on a linux debian platform. The current debian package is 0.85 and I would really like to install 0.9. So I have tried to install the full source distribution (http://media.wu-wien.ac.at/download/xotcl-full-0.9.3.tar.gz), but, as tcl/tk debian include installation is in the same directory (/usr/include/tcl8.3), it's difficult to tell configure how to deal with it. 1) I have tried: ./configure but the tcl configuration directory is not found: checking for Tcl configuration... configure: warning: Can't find Tcl configuration definitions 2) Then I have tried: ./configure --with-tcl=/usr/lib/tcl8.3 --with-tk=/usr/lib/tk8.3 but, when running make: cc -DVERSION=\"0.9\" -DXOTCL_LIBRARY=\"/usr/local/lib/xotcl0.9/library\" -I/usr/include/tcl8.3/tcl-private/generic -I/usr/include/tcl8.3/tcl-private/unix -I"./../generic" -I"./../unix" -I"/usr/include" -g -O -D__NO_STRING_INLINES -D__NO_MATH_INLINES -fPIC -g -DXOLIBPKG=\"/usr/local/lib/xotcl0.9\" -DXOTCLVERSION=\"0.9\" -DXOTCLPATCHLEVEL=\".3\" -c `echo ../unix/xotkAppInit.c` -o o/xotkAppInit.o ../unix/xotkAppInit.c:19: tk.h: No such file or directory ../unix/xotkAppInit.c:31: #error Tk distribution TOO OLD 3) And I get the same error when telling configure where to actually find tk.h (in /usr/include/tcl8.3) : ./configure --with-tcl=/usr/lib/tcl8.3 --with-tk=/usr/include/tcl8.3 cc -DVERSION=\"0.9\" -DXOTCL_LIBRARY=\"/usr/local/lib/xotcl0.9/library\" -I/usr/include/tcl8.3/tcl-private/generic -I/usr/include/tcl8.3/tcl-private/unix -I"./../generic" -I"./../unix" -I"/usr/include" -g -O -D__NO_STRING_INLINES -D__NO_MATH_INLINES -fPIC -g -DXOLIBPKG=\"/usr/local/lib/xotcl0.9\" -DXOTCLVERSION=\"0.9\" -DXOTCLPATCHLEVEL=\".3\" -c `echo ../unix/xotkAppInit.c` -o o/xotkAppInit.o ../unix/xotkAppInit.c:19: tk.h: No such file or directory ../unix/xotkAppInit.c:31: #error Tk distribution TOO OLD make[1]: *** [o/xotkAppInit.o] Error 1 4) I have also tried to specify both include and library, as told by configure --help: ./configure --with-tcl=/usr/lib/tcl8.3 --with-tk=/usr/include/tcl8.3,/usr/lib/tk8.3 but the syntax is not recognized? So my question is: is there a debian package going to be distributed for the 0.9 version? Does this ditribution contain the necessary .h, or is there a xotcl-dev distribution? Or, could someone help? Thanks a lot in advance, -- Catherine Letondal -- Pasteur Institute Computing Center

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26 Mar '02

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introspective tools for documentation?
by Catherine Letondal 19 Mar '02

19 Mar '02

Hi, I believe the only way to document code is now through the @ object and the makeDoc.xotcl script, which uses several utilities from the library/system directory (the old one was the metadata mechanism). Am I right? My question is about the introspective aspect of this feature: how do you get the documentation for a class, method, ...? By parsing its file? Thanks a lot for any help, -- Catherine Letondal -- Pasteur Institute Computing Center

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by webmaster＠alice.wu-wien.ac.at 07 Mar '02

07 Mar '02

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poll for opinions
by Gustaf Neumann 04 Mar '02

04 Mar '02

Dear XOTcl community, we are working currently on various issues which we think are important for our 1.0 release: - speedup through byte-code support - better components with introspection facilities - easy to use rel-db interface ... concerning the first item: i was performing some experiments for providing extension-specific byte-code support, e.g. to allow to register byte-code instructions for the most-used commands in XOTcl (such as [self], next, etc.). through these xotcl-specific bytre-codes we get nice improvements (e.g. [self] is more than 10 times faster, some benchmarks improve by 40%). This improvements require a patch for tcl, which is therefore not acceptable for most people now. We talked to the Tcl implementors to include such a patch, but currently some of them think about a substantial redesign of the bytecode which has much more constraints once extension writers depend on the current design, so i don't expect that a patch with this functionality will be intergrated in tcl in the new future. however, there is already some influence for XOTcl: In Tcl, compilation is command based: this means, for every call of a command literally available in the the body of a proc, a bytecode sequence can be provided by the command. This means that it is possible to compile the body of method m1 in Object o o proc m1 {} { o set x 123 } o proc m2 {} { [self] set x 234 } to something clever, but not the body of m2, since the command in the body of m2 depends on the results of [self] which the compiler does not know. Since m2 is the much better style, we should address this principal problem, since this will ease future improvements for xotcl. An easy soultion is to provide a tcl-command selfInvoke, which can be byte-compiled. selfInvoke has the following sematics proc selfInvoke args { eval [self] $args } and if implemented in C, it leads already to some speedup (without bytecode support), since the call of the tcl command "self" is replaced internally by a call to a c-function. Another advantage is that the number of [self] in an xotcl script is reduced, an programs might become easier to type ()since less shilft/alt/.. keys have to be pressed) and hopefully less "cluttered" to read. yet another advantage is that this change makes in a program more visible when a delegation is used (call to a different object) instead of the call of the current object. since "selfInvoke" is not something i would like to type often either, and this is rather a language primitive, we are considering some syntactical alternatives, and want some input from the "community". Certainly, the explicit call of [self] or to another object will be supported in the future as well. what do you think about the following variants: o proc m1 {} { [self] set x 123 } o proc m2 {} { .. set x 123 } o proc m3 {} { = set x 123 } o proc m4 {} { => set x 123 } o proc m5 {} { - set x 123 } other ideas? note, that the used symbol cannot be used as an (global) object name (same as with next, self, set, and other global tcl commands) what do you think? best regards -gustaf neumann

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Xotck and Vignette
by Lucio Travagnin 01 Mar '02

01 Mar '02

Hi, I'm new to Tcl, XoTcl and Vignette, but I have to use these in a Project. XoTcl extensions can be used with vignette? Could I write some classes and then use them in Vignette Templates? Thank you Lucio ___________________________________________________________________ Lucio Travagnin Java & Perl Senior Developer - Interwoven Technical Manager ltravagnin(a)e-tree.com (ICQ 84914112) E-TREE - Internet Soul / Via Fonderia 43 - 31100 Treviso (Italy) phone +39.0422.3107 fax +39.0422.310888 http://www.e-tree.com http://www.webanana.com ___________________________________________________________________

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Xotcl March 2002