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carve the tough, gamey steak of stack-checker.polymorphism into chewable morsels

db4
Joe Groff 2010-03-11 00:53:40 -08:00
parent f24a74f66c
commit 26ff757de4
1 changed files with 30 additions and 31 deletions
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61
basis/stack-checker/row-polymorphism/row-polymorphism.factor
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@ -10,27 +10,21 @@ stack-checker.values
stack-checker.visitor ;
IN: stack-checker.row-polymorphism
:: with-inner-d ( quot -- inner-d )
inner-d-index get :> old-inner-d-index
meta-d length inner-d-index set
quot call
inner-d-index get :> new-inner-d-index
old-inner-d-index new-inner-d-index min inner-d-index set
new-inner-d-index ; inline
: with-inner-d ( quot -- inner-d )
inner-d-index get
[ meta-d length inner-d-index set call ] dip
inner-d-index get [ min inner-d-index set ] keep ; inline
:: with-effect-here ( quot -- effect )
input-count get :> old-input-count
meta-d length :> old-meta-d-length
:: (effect-here) ( inner-d old-meta-d-length old-input-count -- effect )
old-meta-d-length inner-d - input-count get old-input-count - +
meta-d length inner-d -
[ "x" <array> ] bi@ terminated? get <terminated-effect> ; inline
quot with-inner-d :> inner-d
: with-effect-here ( quot -- effect )
meta-d length input-count get
[ with-inner-d ] 2dip (effect-here) ; inline
input-count get :> new-input-count
old-meta-d-length inner-d -
new-input-count old-input-count - + :> in
meta-d length inner-d - :> out
in "x" <array> out "x" <array> terminated? get <terminated-effect> ; inline
:: check-variable ( actual-count declared-count variable vars -- difference ? )
:: (check-variable) ( actual-count declared-count variable vars -- difference ? )
actual-count declared-count -
variable [
variable vars at* nip
@ -44,20 +38,25 @@ IN: stack-checker.row-polymorphism
[ at+ ]
[ 3drop ] if ; inline
:: check-variables ( vars declared actual -- ? )
actual terminated?>> [ t ] [
actual declared [ in>> length ] bi@ declared in-var>>
[ vars check-variable ] keep :> ( in-diff in-ok? in-var )
actual declared [ out>> length ] bi@ declared out-var>>
[ vars check-variable ] keep :> ( out-diff out-ok? out-var )
{ [ in-ok? ] [ out-ok? ] [ in-diff out-diff = ] } 0&&
dup [
in-var [ in-diff swap vars adjust-variable ] when*
out-var [ out-diff swap vars adjust-variable ] when*
] when
:: check-variable ( vars declared actual slot var-slot -- diff ok? var )
actual declared [ slot call length ] bi@ declared var-slot call
[ vars (check-variable) ] keep ; inline
:: unify-variables ( in-diff in-ok? in-var out-diff out-ok? out-var vars -- ? )
{ [ in-ok? ] [ out-ok? ] [ in-diff out-diff = ] } 0&&
dup [
in-var [ in-diff swap vars adjust-variable ] when*
out-var [ out-diff swap vars adjust-variable ] when*
] when ;
: check-variables ( vars declared actual -- ? )
dup terminated?>> [ 3drop t ] [
[ [ in>> ] [ in-var>> ] check-variable ]
[ [ out>> ] [ out-var>> ] check-variable ]
[ 2drop ] 3tri unify-variables
] if ;
: complex-unbalanced-branches-error ( known -- * )
: combinator-unbalanced-branches-error ( known -- * )
[ word>> ] [
branches>> <reversed>
[ [ known>callable ] { } map-as ]
@ -68,5 +67,5 @@ IN: stack-checker.row-polymorphism
: check-declared-effect ( known effect -- )
[ >>actual ] keep
2dup [ [ variables>> ] [ effect>> ] bi ] dip check-variables
[ 2drop ] [ drop complex-unbalanced-branches-error ] if ;
[ 2drop ] [ drop combinator-unbalanced-branches-error ] if ;