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xotclsh(1) XOTcl Applications xotclsh(1) 





NAME


xotclsh - Tcl Shell containing object-oriented scripting language
    XOTcl






SYNOPSIS


xotclsh ?filename arg arg ...?








DESCRIPTION


xotclsh is a shell-like application that reads XOTcl
    commands from its standard input or from a file and evaluates them.
    Similarly as the relation between tclsh and wish,
    xowish provides all functionality of xotclsh and provides as well
    predefined support for TK widgets.


XOTcl (XOTcl, pronounced exotickle) is an object-oriented
    scripting language based on MIT's OTcl. It is intended as a value added
    replacement of OTcl.


Scripting languages, such as Tcl, are designed for glueing
    components together, provide features such as dynamic extensibility and
    dynamic typing with automatic conversion, that make them well suited for
    rapid application development.


The object system of XOTcl enables a user to to define objects,
    classes, and meta-classes. Classes are special objects with the purpose of
    managing other objects. ``Managing'' means that a class controls the
    creation and destruction of its instances and that it contains a repository
    of methods accessible for the instances. Every object may be enhanced with
    object-specific methods. XOTcl supports single and multiple inheritance. All
    object-class and class-class relationships in XOTcl are introspectable and
    can be dynamically changed at arbitrary times. Ambiguities in name
    resolution of methods are avoided through method chaining through
    "next", which does not require explicit method naming.


XOTcl combines the ideas of scripting and object-orientation in a
    way that preserves the benefits of both of them. It is equipped with several
    new language constructs that help building and managing complex systems. We
    added the following support:




Dynamic Object Aggregations, to provide dynamic
    aggregations through nested namespaces (objects).


Nested Classes, to reduce the interference of independently
    developed program structures.


Assertions, to reduce the interface and the reliability
    problems caused by dynamic typing and, therefore, to ease the combination of
    many components.


Meta-data, to enhance self-documentation of objects and
    classes.


Per-object mixins, as a means to give an object dynamically
    access to the methods of one or several supplemental classes.


Per-class mixins, as a means to give all instances of an
    class dynamically access to the methods of one or several supplemental
    classes.


Filters as a means of abstractions over method invocations
    to implement large program structures, like design patterns.


XOTcl provides a value-added replacement of Tcl package loading
    providing integration with object-oriented constructs and tracking/tracing
    of component loading.






VARIABLES


xotclsh sets all variables that tclsh sets, and
    additionally the following variables:





  
::xotcl::version XOTcl version number.

  

  
::xotcl::confdir Directory for XOTcl configuration.

  

  
::xotcl::logdir Directory where logfiles are placed.

  

    

  








KEYWORDS


argument, interpreter, prompt, script file, shell









  

    
    XOTcl