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implementation module history
// $Id$
import rule
import graph
import pfun
import basic
from general import Optional,Yes,No
import StdEnv
// A history relates node-ids in the subject graph to patterns
:: History sym var
:== [HistoryAssociation sym var]
// An association between a node-id in the subject graph and a history pattern
:: HistoryAssociation sym var
:== ( var // Attachment point in the subject graph where the history pattern is "housed"
, [HistoryPattern sym var] // The pattern in the history
)
// A pattern in the history, specifying the most general subject graph (footprint) for a reduction sequence
:: HistoryPattern sym var
:== Rgraph sym var
// A link in a graph, indicated by its source node-id and the argument number
// The root of a graph can be indicated by the No constructor
:: Link var
:== Optional (var,Int)
/************************************************
* Verifying a subject graph against the history *
************************************************/
matchhistory
:: (History sym var) // Complete history against which to check
[var] // Node-ids for which to include history patterns
(Graph sym var) // Current subject graph
var // Current application point of strategy
-> [HistoryPattern sym var] // Matching history patterns
| == sym
& == var
matchhistory hist spinenodes sgraph snode
= foldr (checkassoc spinenodes sgraph snode) [] hist
checkassoc spinenodes sgraph snode (var,pats) rest
= if (isMember var spinenodes) (foldr checkpat rest pats) rest
where checkpat pat rest
= if (isinstance (hgraph,hroot) (sgraph,snode)) [pat:rest] rest
where hgraph = rgraphgraph pat; hroot = rgraphroot pat
/*
instantiate ::
(HistoryPattern sym pvar)
(Graph sym var)
var
([(pvar,var)],[(pvar,var)],[(pvar,var)])
-> ([(pvar,var)],[(pvar,var)],[(pvar,var)])
*/
(writeHistory) infixl :: *File (History sym var) -> .File | toString sym & toString,== var
(writeHistory) file history = sfoldl (writeHistoryAssociation) file history
(writeHistoryAssociation) infixl :: *File (HistoryAssociation sym var) -> .File | toString sym & toString,== var
(writeHistoryAssociation) file ha = file <<< showpair toString (showlist toString) ha <<< nl
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