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xowish - Graphical shell containing object-oriented scripting language XOTcl


xowish ?fileName arg arg ...?


xowish is a shell-like application that reads XOTcl commands from its standard input or
from a file and evaluates them. In addition to xotclsh it provides graphical user
interface 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 for OTcl.

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

The basic object system of XOTcl is adopted from OTcl. The object system enables us 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 relationships in XOTcl, including class and
superclass relationships, are completely dynamic and can be introspected. Through method
chaining without explicit naming of the intended method, ambiguities in name resolution of
methods are avoided. This way a shadowed method can be ``mixed into'' the execution of the
current method.

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 functionalities that
help building and managing complex systems. We added the following support:

Dynamic Object Aggregations, to provide dynamic aggregations through nested namespaces

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 improve flexibility of mixin methods by giving an object
access to several different supplemental classes, which may be changed dynamically.

Per-class mixins, as a means to improve flexibility of mixin methods to a class, all
instances of the class have access to the mixed in methods like for multiple inheritance,
but without the need of intersection classes.

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

Dynamic Component Loading XOTcl integrates the Tcl package loading with architectrual
support for integration with object-oriented constructs. Moreover, it provides
tracking/tracing of component loading.


argument, interpreter, prompt, script file, shell

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