47 lines
2.6 KiB
Factor
47 lines
2.6 KiB
Factor
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USING: help.markup help.syntax strings alien hashtables ;
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IN: cocoa.subclassing
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HELP: define-objc-class
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{ $values { "hash" hashtable } { "imeth" "a sequence of instance method definitions" } }
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{ $description "Defines a new Objective C class. The hashtable can contain the following keys:"
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{ $list
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{ { $link +name+ } " - a string naming the new class. Required." }
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{ { $link +superclass+ } " - a string naming the superclass. Required." }
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{ { $link +protocols+ } " - an array of strings naming protocols implemented by the superclass. Optional." }
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}
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"Every element of " { $snippet "imeth" } " defines an instance method, and is an array having the shape "
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{ $snippet "{ name return args quot }" }
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".:"
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{ $table
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{ "name" { "a selector name" } }
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{ "name" { "a C type name; see " { $link "c-data" } } }
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{ "args" { "a sequence of C type names; see " { $link "c-data" } } }
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{ "quot" { "a quotation to be run as a callback when the method is invoked; see " { $link alien-callback } } }
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}
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"The quotation is run with the following values on the stack:"
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{ $list
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{ "the receiver of the message; an " { $link alien } " pointing to an instance of this class" }
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{ "the selector naming the message; in most cases this value can be ignored" }
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"arguments passed to the message, if any"
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}
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"There is no way to define instance variables or class methods using this mechanism. However, instance variables can be simulated by using the receiver to key into a hashtable." } ;
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HELP: CLASS:
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{ $syntax "CLASS: spec imeth... ;" }
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{ $values { "spec" "an array of pairs" } { "name" "a new class name" } { "imeth" "instance method definitions" } }
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{ $description "A sugared form of the following:"
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{ $code "{ imeth... } \"spec\" define-objc-class" }
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"This word is preferred to calling " { $link define-objc-class } ", because it creates a class word in the " { $vocab-link "cocoa.classes" } " vocabulary at parse time, allowing code to refer to the class word in the same source file where the class is defined." } ;
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{ define-objc-class POSTPONE: CLASS: } related-words
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ARTICLE: "objc-subclassing" "Subclassing Objective C classes"
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"Objective C classes can be subclassed, with new methods defined in Factor, using a parsing word:"
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{ $subsection POSTPONE: CLASS: }
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"This word is actually syntax sugar for an ordinary word:"
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{ $subsection define-objc-class }
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"Objective C class definitions are saved in the image. If the image is saved and Factor is restarted with the saved image, custom class definitions are made available to the Objective C runtime when they are first accessed from within Factor." ;
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IN: cocoa.subclassing
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ABOUT: "objc-subclassing"
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