100 lines
2.8 KiB
Factor
100 lines
2.8 KiB
Factor
! Copyright (C) 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: generic
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USING: errors hashtables kernel kernel-internals lists math
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namespaces parser sequences sequences-internals strings vectors
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words ;
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! Tuples are really arrays in the runtime, but with a different
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! type number. The layout is as follows:
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! slot 0 - object header with type number (as usual)
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! slot 1 - length, including class/delegate slots
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! slot 2 - the class, a word
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! slot 3 - the delegate tuple, or f
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: class ( object -- class )
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dup tuple? [ 2 slot ] [ type type>class ] ifte ; inline
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: class-tuple ( object -- class )
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dup tuple? [ 2 slot ] [ drop f ] ifte ; inline
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: tuple-predicate ( word -- )
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#! Make a foo? word for testing the tuple class at the top
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#! of the stack.
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dup predicate-word
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[ \ class-tuple , over literalize , \ eq? , ] [ ] make
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define-predicate ;
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: forget-tuple ( class -- )
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dup forget "predicate" word-prop car [ forget ] when* ;
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: check-shape ( word slots -- )
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#! If the new list of slots is different from the previous,
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#! forget the old definition.
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>r "in" get lookup dup [
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dup "tuple-size" word-prop r> length 2 + =
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[ drop ] [ forget-tuple ] ifte
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] [
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r> 2drop
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] ifte ;
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: delegate-slots @{ @{ 3 delegate set-delegate }@ }@ ;
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: tuple-slots ( tuple slots -- )
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2dup "slot-names" set-word-prop
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2dup length 2 + "tuple-size" set-word-prop
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dupd 4 simple-slots
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2dup delegate-slots swap append "slots" set-word-prop
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define-slots ;
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: tuple-constructor ( class -- word )
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word-name "in" get constructor-word dup save-location ;
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: define-constructor ( word class def -- )
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>r [
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dup literalize , "tuple-size" word-prop , \ make-tuple ,
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] [ ] make r> append define-compound ;
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: default-constructor ( tuple -- )
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[ tuple-constructor ] keep dup [
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"slots" word-prop 1 swap tail-slice reverse-slice
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[ peek unit , \ keep , ] each
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] [ ] make define-constructor ;
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: define-tuple ( tuple slots -- )
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2dup check-shape
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>r create-in
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dup intern-symbol
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dup tuple-predicate
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dup \ tuple reintern "superclass" set-word-prop
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dup define-class
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dup r> tuple-slots
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default-constructor ;
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M: tuple clone ( tuple -- tuple )
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#! Clone a tuple and its delegate.
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(clone) dup delegate clone over set-delegate ;
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M: tuple hashcode ( vec -- n )
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#! Poor.
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array-capacity ;
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M: tuple = ( obj tuple -- ? )
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2dup eq? [
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2drop t
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] [
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over tuple? [ array= ] [ 2drop f ] ifte
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] ifte ;
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PREDICATE: word tuple-class "tuple-size" word-prop ;
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: is? ( obj pred -- ? | pred: obj -- ? )
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#! Tests if the object satisfies the predicate, or if
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#! it delegates to an object satisfying it.
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[ call ] 2keep rot [
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2drop t
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] [
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over [ >r delegate r> is? ] [ 2drop f ] ifte
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] ifte ; inline
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