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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
| Eq sym
& Eq var
matchhistory hist spinenodes sgraph snode
= foldr ((checkassoc--->"history.checkassoc begins from history.matchhistory") spinenodes sgraph snode) [] hist <--- "history.matchhistory ends"
checkassoc spinenodes sgraph snode (var,pats) rest
= ((if (isMember var spinenodes) (foldr (checkpat--->"history.checkassoc.checkpat begins from history.checkassoc") rest pats) (rest--->"history.checkassoc history attachment node is not part of the spine nodes")) <--- "history.checkassoc ends") ---> ("history.checkassoc number of history patterns for node is "+++toString (length pats))
where checkpat pat rest
= (if ((isinstance--->"graph.isinstance begins from history.checkassoc.checkpat") (hgraph,hroot) (sgraph,snode)) [pat:rest] rest) <--- "history.checkassoc.checkpat ends"
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)])
*/
historyToString ::
(History sym var)
-> String
| toString sym
& toString var
& Eq var
historyToString history
= showlist (showpair toString (showlist toString)) history
(writeHistory) infixl :: *File (History sym var) -> .File | toString sym & toString,== var
(writeHistory) file history = file <<< "<history>" // sfoldl (writeHistoryAssociation) file history
(writeHistoryAssociation) infixl :: *File (HistoryAssociation sym var) -> .File | toString sym & toString,== var
(writeHistoryAssociation) file ha = file <<< "<historyassociation>" // showpair toString (showlist toString) ha <<< nl
printhistory ::
(sym->String)
(var->String)
String
(History sym var)
*File
-> .File
| == var
printhistory showsym showvar indent history file
= foldl (flip (printhistoryassociation showsym showvar indent)) file history
printhistoryassociation showsym showvar indent vargraphs file
= printlist (myshowrgraph showsym showvar) (indent+++" ") rgraphs (file <<< indent <<< showvar var <<< " <=" <<< nl)
//= file <<< indent <<< showvar var <<< " <=" <<< showlist (showrgraph showsym showvar) rgraphs <<< nl
//= file <<< indent <<< showpair showvar (showlist toString) vargraphs <<< nl
//= file <<< "<history>" <<< nl
where (var,rgraphs) = vargraphs
myshowrgraph showsym showvar rgraph
= hd (printgraphBy showsym showvar (rgraphgraph rgraph) [rgraphroot rgraph])
|
