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PACKET purge DEFINES purge :
TEXT VAR task name, record, file name, dummy ;
FILE VAR permit ;
PROC purge :
IF exists ("permitted tasks")
THEN access catalogue ;
permit := sequential file (input, "permitted tasks") ;
say (""10""13"TASKS :"10""10""13"") ;
IF myself < supervisor
THEN purge son tasks (brother (supervisor))
ELSE purge son tasks (myself)
FI
FI ;
IF exists ("permitted files")
THEN permit := sequential file (input, "permitted files") ;
say (""10""13"DATEIEN :"10""10""13"") ;
purge files
FI
ENDPROC purge ;
PROC purge son tasks (TASK CONST father task) :
TASK VAR actual task := son (father task) ;
WHILE NOT is niltask (actual task) REP
purge son tasks (actual task) ;
IF NOT actual task permitted
THEN erase actual task
FI ;
actual task := brother (actual task)
END REP .
erase actual task :
say ("""") ; say (task name) ; say ("""") ;
IF yes (" loeschen")
THEN end (actual task)
FI .
actual task permitted :
task name := name (actual task) ;
reset (permit) ;
WHILE NOT eof (permit) REP
getline (permit, record) ;
IF task name = record
THEN LEAVE actual task permitted WITH TRUE
FI
END REP ;
FALSE .
ENDPROC purge son tasks ;
PROC purge files :
begin list ;
get list entry (file name, dummy) ;
WHILE file name <> "" REP
IF NOT file permitted
THEN forget (file name)
FI ;
get list entry (file name, dummy)
END REP .
file permitted :
IF file name = "permitted tasks" OR file name = "permitted files"
THEN LEAVE file permitted WITH TRUE
FI ;
reset (permit) ;
WHILE NOT eof (permit) REP
getline (permit, record) ;
IF file name = record
THEN LEAVE file permitted WITH TRUE
FI
END REP ;
FALSE .
ENDPROC purge files ;
ENDPACKET purge ;
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