80 lines
2.0 KiB
Factor
80 lines
2.0 KiB
Factor
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! :sidekick.parser=none:
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IN: oop
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USE: combinators
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USE: errors
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USE: hashtables
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USE: kernel
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USE: lists
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USE: namespaces
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USE: parser
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USE: stack
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USE: strings
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USE: words
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SYMBOL: traits
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: traits-map ( word -- hash )
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#! The method map word property maps selector words to
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#! definitions.
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"traits-map" word-property ;
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: object-map ( obj -- hash )
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dup has-namespace? [ traits swap get* ] [ drop f ] ifte ;
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: init-traits-map ( word -- )
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<namespace> "traits-map" set-word-property ;
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: no-method
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"No applicable method." throw ;
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: method ( traits selector -- quot )
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#! Execute the method with the traits object on the stack.
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over object-map hash* [ cdr ] [ [ no-method ] ] ifte* ;
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: constructor-word ( word -- word )
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word-name "<" swap ">" cat3 "in" get create ;
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: define-constructor ( word -- )
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#! <foo> where foo is a traits type creates a new instance
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#! of foo.
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[ constructor-word [ <namespace> ] ] keep
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traits-map [ traits pick set* ] cons append
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define-compound ;
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: predicate-word ( word -- word )
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word-name "?" cat2 "in" get create ;
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: define-predicate ( word -- )
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#! foo? where foo is a traits type tests if the top of stack
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#! is of this type.
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dup predicate-word swap
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[ object-map ] swap traits-map [ eq? ] cons append
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define-compound ;
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: TRAITS:
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#! TRAITS: foo creates a new traits type. Instances can be
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#! created with <foo>, and tested with foo?.
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CREATE
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dup define-symbol
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dup init-traits-map
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dup define-constructor
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define-predicate ; parsing
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: GENERIC:
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#! GENERIC: bar creates a generic word bar that calls the
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#! bar method on the traits object, with the traits object
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#! on the stack.
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CREATE
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dup unit [ car method call ] cons
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define-compound ; parsing
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: M:
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#! M: foo bar begins a definition of the bar generic word
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#! specialized to the foo type.
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scan-word scan-word f ; parsing
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: ;M
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#! ;M ends a method definition.
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reverse transp traits-map set* ; parsing
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