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|
definition module rewr
// $Id$
from rule import Rule
from graph import Graph
from pfun import Pfun
from StdOverloaded import ==
// Unfold a rewrite rule
xunfold
:: var
(Rule sym pvar)
!( [var]
, var
, Graph sym var
, Pfun pvar var
)
-> ( [var]
, var
, Graph sym var
, Pfun pvar var
) | == var & == pvar
foldfn
:: (Pfun pvar var) // Matching of replacement
sym // Symbol at root of pattern
[pvar] // Arguments of pattern
pvar // Root of replacement
(Graph sym var) // Subject graph
-> Graph sym var // Folded subject
| == pvar
getmapping
:: tsym
(Graph sym pvar)
(Graph sym var)
!(pvar,var)
((Pfun pvar var) -> tsym)
!(Pfun pvar var)
-> tsym
| == sym
& == var
& == pvar
instantiate
:: .(Graph sym pvar) // Pattern to instantiate with
pvar // Root of the pattern
var // Open node to instantiate
(.[var],.Graph sym var) // Heap,graph
-> .([var],Graph sym var) // New heap,graph
| == var
& == pvar
|
