factor/core/kernel/kernel.factor

204 lines
4.4 KiB
Factor

! Copyright (C) 2004, 2008 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: kernel.private slots.private classes.tuple.private ;
IN: kernel
! Stack stuff
: spin ( x y z -- z y x ) swap rot ; inline
: roll ( x y z t -- y z t x ) >r rot r> swap ; inline
: -roll ( x y z t -- t x y z ) swap >r -rot r> ; inline
: 2over ( x y z -- x y z x y ) pick pick ; inline
: clear ( -- ) { } set-datastack ;
! Combinators
GENERIC: call ( callable -- )
DEFER: if
: ? ( ? true false -- true/false )
#! 'if' and '?' can be defined in terms of each other
#! because the JIT special-cases an 'if' preceeded by
#! two literal quotations.
rot [ drop ] [ nip ] if ; inline
: if ( ? true false -- ) ? call ;
! Single branch
: unless ( ? false -- )
swap [ drop ] [ call ] if ; inline
: when ( ? true -- )
swap [ call ] [ drop ] if ; inline
! Anaphoric
: if* ( ? true false -- )
pick [ drop call ] [ 2nip call ] if ; inline
: when* ( ? true -- )
over [ call ] [ 2drop ] if ; inline
: unless* ( ? false -- )
over [ drop ] [ nip call ] if ; inline
! Default
: ?if ( default cond true false -- )
pick [ roll 2drop call ] [ 2nip call ] if ; inline
! Slippers
: slip ( quot x -- x ) >r call r> ; inline
: 2slip ( quot x y -- x y ) >r >r call r> r> ; inline
: 3slip ( quot x y z -- x y z ) >r >r >r call r> r> r> ; inline
: dip ( obj quot -- obj ) swap slip ; inline
: 2dip ( obj1 obj2 quot -- obj1 obj2 ) -rot 2slip ; inline
: 3dip ( obj1 obj2 obj3 quot -- obj1 obj2 obj3 ) -roll 3slip ; inline
! Keepers
: keep ( x quot -- x ) over slip ; inline
: 2keep ( x y quot -- x y ) 2over 2slip ; inline
: 3keep ( x y z quot -- x y z ) >r 3dup r> -roll 3slip ; inline
! Cleavers
: bi ( x p q -- )
>r keep r> call ; inline
: tri ( x p q r -- )
>r >r keep r> keep r> call ; inline
! Double cleavers
: 2bi ( x y p q -- )
>r 2keep r> call ; inline
: 2tri ( x y p q r -- )
>r >r 2keep r> 2keep r> call ; inline
! Triple cleavers
: 3bi ( x y z p q -- )
>r 3keep r> call ; inline
: 3tri ( x y z p q r -- )
>r >r 3keep r> 3keep r> call ; inline
! Spreaders
: bi* ( x y p q -- )
>r dip r> call ; inline
: tri* ( x y z p q r -- )
>r >r 2dip r> dip r> call ; inline
! Double spreaders
: 2bi* ( w x y z p q -- )
>r 2dip r> call ; inline
! Appliers
: bi@ ( x y quot -- )
dup bi* ; inline
: tri@ ( x y z quot -- )
dup dup tri* ; inline
! Double appliers
: 2bi@ ( w x y z quot -- )
dup 2bi* ; inline
: loop ( pred: ( -- ? ) -- )
dup slip swap [ loop ] [ drop ] if ; inline recursive
: while ( pred: ( -- ? ) body: ( -- ) tail: ( -- ) -- )
>r >r dup slip r> r> roll
[ >r tuck 2slip r> while ]
[ 2nip call ] if ; inline recursive
! Object protocol
GENERIC: hashcode* ( depth obj -- code )
M: object hashcode* 2drop 0 ;
M: f hashcode* 2drop 31337 ;
: hashcode ( obj -- code ) 3 swap hashcode* ; inline
GENERIC: equal? ( obj1 obj2 -- ? )
M: object equal? 2drop f ;
TUPLE: identity-tuple ;
M: identity-tuple equal? 2drop f ;
: = ( obj1 obj2 -- ? )
2dup eq? [ 2drop t ] [ equal? ] if ; inline
GENERIC: clone ( obj -- cloned )
M: object clone ;
M: callstack clone (clone) ;
! Tuple construction
GENERIC: new ( class -- tuple )
GENERIC: boa ( ... class -- tuple )
! Quotation building
: 2curry ( obj1 obj2 quot -- curry )
curry curry ; inline
: 3curry ( obj1 obj2 obj3 quot -- curry )
curry curry curry ; inline
: with ( param obj quot -- obj curry )
swapd [ swapd call ] 2curry ; inline
: prepose ( quot1 quot2 -- compose )
swap compose ; inline
: 3compose ( quot1 quot2 quot3 -- compose )
compose compose ; inline
! Booleans
: not ( obj -- ? ) [ f ] [ t ] if ; inline
: and ( obj1 obj2 -- ? ) over ? ; inline
: >boolean ( obj -- ? ) [ t ] [ f ] if ; inline
: or ( obj1 obj2 -- ? ) dupd ? ; inline
: xor ( obj1 obj2 -- ? ) [ f swap ? ] when* ; inline
: both? ( x y quot -- ? ) bi@ and ; inline
: either? ( x y quot -- ? ) bi@ or ; inline
: most ( x y quot -- z )
>r 2dup r> call [ drop ] [ nip ] if ; inline
! Error handling -- defined early so that other files can
! throw errors before continuations are loaded
: throw ( error -- * ) 5 getenv [ die ] or 1 (throw) ;
ERROR: assert got expect ;
: assert= ( a b -- ) 2dup = [ 2drop ] [ assert ] if ;
<PRIVATE
: declare ( spec -- ) drop ;
: hi-tag ( obj -- n ) { hi-tag } declare 0 slot ; inline
: do-primitive ( number -- ) "Improper primitive call" throw ;
PRIVATE>