xotclsh - Online in the Cloud

PROGRAM:

NAME

xotclsh - Tcl Shell containing object-oriented scripting language XOTcl

SYNOPSIS

xotclsh ?filename arg arg ...?
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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

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