tool - TclOO Library (TOOL) Framework
This module implements the Tcl Object Oriented Library framework, or TOOL. It is intended to be a general purpose framework that is useable in its own right, and easily extensible.
TOOL defines a metaclass with provides several additional keywords to the TclOO description langauge, default behaviors for its consituent objects, and top-down integration with the capabilities provided by the oo::meta package.
The TOOL metaclass was build with the oo::dialect package, and thus can be used as the basis for additional metaclasses. As a metaclass, TOOL has it's own "class" class, "object" class, and define namespace.
package require tool
# tool::class workds just like oo::class
tool::class create myclass {
}
# tool::define works just like oo::define
tool::define myclass method noop {} {}
# tool::define and tool::class understand additional keywords
tool::define myclass array_ensemble mysettings mysettings {}
# And tool interoperates with oo::define
oo::define myclass method do_something {} { return something }
# TOOL and TclOO objects are interchangeable
oo::class create myooclass {
superclass myclass
}
Several manual pages go into more detail about specific keywords and methods.
TOOL adds new (or modifies) keywords used in the definitions of classes. However, the new keywords are only available via calls to tool::class create or tool::define
Defines a method for the class object itself. This method will be passed on to descendents of the class, unlike self method.
Declares a variable name which will be initialized as an array, populated with contents for objects of this class, as well as any objects for classes which are descendents of this class.
Declares a method ensemble methodname which will control access to variable varname. Cases are a key/value list of method names and bodies which will be overlaid on top of the standard template. See tool::array_ensemble.
One method name is reserved: initialize. initialize Declares the initial values to be populated in the array, as a key/value list, and will not be expressed as a method for the ensemble.
Declares a method ensemble methodname which will control access to variable varname. Cases are a key/value list of method names and bodies which will be overlaid on top of the standard template. See tool::dict_ensemble.
One method name is reserved: initialize. initialize Declares the initial values to be populated in the array, as a key/value list, and will not be expressed as a method for the ensemble.
If methodname contains ::, the method is considered to be part of a method ensemble. See tool::method_ensembles. Otherwise this command behaves exactly like the standard oo::define method command.
Declares an option. dictopts is a key/value list defining parameters for the option. See tool::option_handling.
tool::class create myclass {
option color {
post-command: {puts [list %self%'s %field% is now %value%]}
default: green
}
}
myclass create foo
foo configure color purple
> foo's color is now purple
Defines a new leaf in the class metadata tree. With no branch, the leaf will appear in the const section, accessible by either the object's property method, or via oo::meta::info class get const field:
Declares a variable name which will be initialized with the value value for objects of this class, as well as any objects for classes which are descendents of this class.
The TOOL object mother of all classes defines several methods to enforces consistent behavior throughout the framework.
Return the value of this object's option option. If the property options_strict is true for this class, calling an option which was not declared by the option keyword will throw an error. In all other cases if the value is present in the object's options array that value is returned. If it does not exist, the object will attempt to retrieve a property of the same name.
This command will inject new values into the objects options array, according to the rules as set forth by the option descriptions. See tool::option_handling for details. configure will strip leading -'s off of field names, allowing it to behave in a quasi-backward compatible manner to tk options.
This command will inject new values into the objects options array, according to the rules as set forth by the option descriptions. This command will perform validation and alternate storage rules. It will not invoke trigger rules. See tool::option_handling for details.
A passthrough to oo:objdefine [self] forward
Delegates the <stub> method to the object or command designated by forward
tool::object create A tool::object create B A graft buddy B A configure color red B configure color blue A cget color > red A <buddy> cget color > blue
Consults the metadata for the class to ensure every array, option, and variable which has been declared but not initialized is initialized with the default value. This method is called by the constructor and the morph method. It is safe to invoke multiple times.
Executes a block of text within the namespace of the object. Lines that begin with a # are ignored as comments. Commands that begin with :: are interpreted as calling a global command. All other Tcl commands that lack a "my" prefix are given one, to allow the script to exercise internal methods. This method is intended for configuration scripts, where the object's methods are intepreting a domain specific language.
tool::class myclass {
constructor script {
my Eval_Script $script
}
method node {nodename info} {
my variable node
dict set node $nodename $info
}
method get {args} {
my variable node
return [dict get $node $args]
}
}
myclass create movies {
# This block of code is executed by the object
node {The Day the Earth Stood Still} {
date: 1952
characters: {GORT Klatoo}
}
}
movies get {The Day the Earth Stood Still} date:
> 1952
Computes the default value for an option. See tool::option_handling.
Sean Woods
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category tcloo of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.
When proposing code changes, please provide unified diffs, i.e the output of diff -u.
Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.
TclOO
Copyright © 2015 Sean Woods <yoda@etoyoc.com>