SKICombinators UTΒΆ

computation.spad line 1632

parse result includes term returned and new index

=: (%, %) -> Boolean
return true if equal (deep search) that is: all terms at all levels in tree must be equal to return true all terms must be exactly equal, not just equivalent, that is SKK=I will return false even though ‘SKK’ and ‘I’ have the same effect
~=: (%, %) -> Boolean
from BasicType
atom?: % -> Boolean
returns true if this is an atom, that is a leaf node otherwise return false if this is a compound term
coerce: % -> OutputForm
from CoercibleTo OutputForm
freeVariable?: (%, UT) -> Boolean
the variable indicated by 's' is free if it does not appear in node 'n' or any of its subnodes.
getChildren: % -> List %
returns child nodes if this is a compound term otherwise returns []
getVariable: % -> UT
returns the variable, if this is not a variable then return I
hash: % -> SingleInteger
from SetCategory
hashUpdate!: (HashState, %) -> HashState
from SetCategory
I: () -> %
Constructs a I combinator
isI?: % -> Boolean
returns true if this is an I combinator node
isK?: % -> Boolean
returns true if this is a K combinator node
isS?: % -> Boolean
returns true if this is a S combinator node
K: () -> %
Constructs a K combinator
latex: % -> String
from SetCategory
parseSki: String -> %
Constructs combinators from a string
parseTerm: (String, NonNegativeInteger) -> Record(rft: %, pout: NonNegativeInteger)
parseTerm is used by parseSki. It would rarely be called externally but it is here to allow it to call parseSki that is to allow circular calls
redux: % -> %
weak reduction - apply this combinator to rearrange its subnodes then apply recursively to its subnodes.
S: () -> %
Constructs a S combinator
ski: (%, %) -> %
Constructs a node combinator over combinators
ski: UT -> %
Constructs variable combinator
toString: % -> String
output
variable?: % -> Boolean
returns true if this is an variable

BasicType

CoercibleTo OutputForm

SetCategory