Xotcl April 2019

xotcl@alice.wu.ac.at

1 participants
2 discussions

Announcement: Next Scripting Framework 2.0.0 available
by Gustaf Neumann 09 May '19

09 May '19

Dear Community, Since releasing the Next Scripting Framework (NSF) 2.0b5, we have received more feedback from early adopters. Many thanks for the helpful and the constructive comments! Since the release of 2.0b5, there have been more than 450 commits to our code repository. The implementation is very stable and has been used for more than two years in production of our large-scale, multi-threaded web environment inside NaviServer. Most of the changes happened in NX and, therefore, on the NSF scripting level, without the need to modify the NSF C layer. The implementation of XOTcl 2 has changed very little. The Next Scripting Framework was tested with Tcl 8.5.17 and Tcl 8.6.2 on Linux, Mac OS X, and in Windows enviroments (MinGW, VC12). Below are the most notable differences in NSF/NX 2.0 final relative to 2.0b5: a) Pluralism reform: Use plural names for structural features of objects and classes, whenever potentially multiple elements are provided or returned. This rule applies now consistently throughout NX. Here are examples from the introspection interface: /cls/ info superclasses /cls/ info subclasses /cls/ info mixins /obj/ info object mixins /cls/ info filters /obj/ info object filters Similarly, there the plural is used for configure options, e.g.: nx:create create Foo -superclasses {C D} Note that abbreviations are allowed as well: nx:create create Foo -superclass {C D} b) Dispatch by arity is gone in NX. XOTcl and earlier versions of NX supported a dispatch-by-arity mechanism for relation slots: o mixin; # arity 1: get value o mixin M1; # arity 2: set value o mixin add M1; # arity 3: use arg 2 for slot methods The problem with this approach is that it is not straight forward to provide meaningful error messages. In addition, one might be irritated about the result of e.g. "o mixin add" (leaving out a class to be added). In the final release, we removed the entailed complexity by relying on a fixed arity of 3 (last form above) for the default slot methods: add, clear, delete, get, guard, set c) Support for querying computed parameters of methods. Earlier versions of NX had several methods to query the parameters for configuring objects of different classes. The configure parameters are determined by the inheritance order in the class hierarchy and are relevant during object creation (e.g. methods "create" or "new"). Now, these configure parameter can be queried using the standard parameter introspection interface for e.g. "new", "create", or "configure", such as in: nx::Object info lookup parameters create The above command call returns the parameters which can be provided to an "nx::Object create ..." invocation. Furthermore, these computed parameters are returned in error messages. d) Support abbreviations of non-positional parameter names (for plain methods, nsf::proc, or "... configure..."). To avoid surprises, especially for computed argument lists, the minimal number of optional trailing characters is set to 4. e) Updated MongoDB interface: The interface was extended in various ways and is now based on mongo-c-driver 1.0.2 and was tested with MongoDB 2.6.5. The driver can be used nicely with e.g. Naviserver by using the c-driver supported connection pool. f) API changes: nx::Object info lookup parameters create /cls/ mixins ... /obj/ object mixins ... /cls/ filters ... /obj/ object filters ... Simplified info methods for interceptors: /cls/ info mixin classes -> /cls/ info mixins /cls/ info filter methods -> /cls/ info filters /obj/ info object mixin classes -> /obj/ info object mixins Dropped methods: /cls/ info mixin guard /obj/ info object mixin guard /cls/ info filter guard /obj/ info object filter guard Instead, use the "-guards" option of "... info ?object? mixins|filters ...". Added methods: /cls/ mixins classes /cls/ filters methods /obj/ object filters methods /obj/ object mixins classes g) Added API documentation: Using tcllib's doctools markup and dtplite, we now provide manpages for: nx::Object nx::Class nx::current nx::next nx::configure The Next Scripting Framework 2.0.0 (containing NX and XOTcl 2.0.0) can be obtained from https://next-scripting.org/ The detailed ChangeLog can be downloaded from https://next-scripting.org/xowiki/download/file/ChangeLog-2.0b5-2.0.0 Best regards - Gustaf Neumann - Stefan Sobernig

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1st Call For Papers - 26th Annual Tcl/Tk Conference (Tcl'2019)
by conference＠tclcommunityassociation.org 23 Apr '19

23 Apr '19

Hello XOTcl Developers, fyi ... 26th Annual Tcl/Tk Conference (Tcl'2019) https://www.tcl-lang.org/community/tcl2019/ November 04 - 08, 2019 Crowne Plaza Houston River Oaks 2712 Southwest Freeway, 77098 Houston, Texas, USA [ NEWS * [Submission is open](https://www.tcl-lang.org/community/tcl2019/cfp.html) ] Important Dates: Abstracts and proposals due September 09, 2019 Notification to authors September 16, 2019 WIP and BOF reservations open August 12, 2019 ** may change ** Registration opens September 09, 2019 ** may change ** Author materials due October 14, 2019 Tutorials Start November 04, 2019 Conference starts November 06, 2019 Email Contact: tclconference(a)googlegroups.com Submission of Summaries Tcl/Tk 2019 will be held in Houston, Texas, USA from November 04, 2019 to November 08, 2019. The program committee is asking for papers and presentation proposals from anyone using or developing with Tcl/Tk (and extensions). Past conferences (Proceedings: https://www.tcl-lang.org/community/conferences.html) have seen submissions covering a wide variety of topics including: * Scientific and engineering applications * Industrial controls * Distributed applications and Network Managment * Object oriented extensions to Tcl/Tk * New widgets for Tk * Simulation and application steering with Tcl/Tk * Tcl/Tk-centric operating environments * Tcl/Tk on small and embedded devices * Medical applications and visualization * Use of different programming paradigms in Tcl/Tk and proposals for new directions. * New areas of exploration for the Tcl/Tk language Submissions should consist of an abstract of about 100 words and a summary of not more than two pages, and should be sent as plain text to tclconference(a)googlegroups.com no later than September 09, 2019. Authors of accepted abstracts will have until October 14, 2019 to submit their final paper for the inclusion in the conference proceedings. The proceedings will be made available on digital media, so extra materials such as presentation slides, code examples, code for extensions etc. are encouraged. Printed proceedings will be produced as an on-demand book at lulu.com Online proceedings will appear via https://www.tcl-lang.org/community/conferences.html The authors will have 30 minutes to present their paper at the conference. The program committee will review and evaluate papers according to the following criteria: * Quantity and quality of novel content * Relevance and interest to the Tcl/Tk community * Suitability of content for presentation at the conference Proposals may report on commercial or non-commercial systems, but those with only blatant marketing content will not be accepted. Application and experience papers need to strike a balance between background on the application domain and the relevance of Tcl/Tk to the application. Application and experience papers should clearly explain how the application or experience illustrates a novel use of Tcl/Tk, and what lessons the Tcl/Tk community can derive from the application or experience to apply to their own development efforts. Papers accompanied by non-disclosure agreements will be returned to the author(s) unread. All submissions are held in the highest confidentiality prior to publication in the Proceedings, both as a matter of policy and in accord with the U. S. Copyright Act of 1976. The primary author for each accepted paper will receive registration to the Technical Sessions portion of the conference at a reduced rate. Other Forms of Participation The program committee also welcomes proposals for panel discussions of up to 90 minutes. Proposals should include a list of confirmed panelists, a title and format, and a panel description with position statements from each panelist. Panels should have no more than four speakers, including the panel moderator, and should allow time for substantial interaction with attendees. Panels are not presentations of related research papers. Slots for Works-in-Progress (WIP) presentations and Birds-of-a-Feather sessions (BOFs) are available on a first-come, first-served basis starting in August 12, 2019. Specific instructions for reserving WIP and BOF time slots will be provided in the registration information available in August 12, 2019. Some WIP and BOF time slots will be held open for on-site reservation. All attendees with an interesting work in progress should consider reserving a WIP slot. Registration Information More information on the conference is available the conference Web site (https://www.tcl-lang.org/community/tcl2019/) and will be published on various Tcl/Tk-related information channels. To keep in touch with news regarding the conference, subscribe to the tclconference(a)googlegroups.com list. See: https://groups.google.com/forum/#!forum/tclconference for list information, archive, and subscription. To keep in touch with Tcl events in general, subscribe to the tcl-announce list. See: https://code.activestate.com/lists/tcl-announce for list information, archive, and subscription. Conference Committee * Andreas Kupries * Arjen Markus Deltares * Brian Griffin Mentor - A Siemens Business * Gerald Lester KnG Consulting LLC * Joe Mistachkin Mistachkin Systems * Ronald Fox CAEN Technologies NSCL @ Michigan State University Contact Information tclconference(a)googlegroups.com Tcl'2019 would like to thank those who are sponsoring the conference: * FlightAware * Mentor - A Siemens Business * Noumena Corp

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Xotcl April 2019