DIRECTORY
BasicTime USING [GMT, nullGMT, Period],
DFInternal USING [AbortDF, CheckAbort, Client, ClientDescriptor, DefaultInteractionProc, DoAbort, GetFileInfo, LocalFileInfo, RemoteFileInfo, ReportFSError, ShortName, SimpleInteraction, YesOrNo],
DFOperations USING [AbortInteraction, DFInfoInteraction, FileAction, FileInteraction, InfoInteraction, InteractionProc, SModelAction],
DFUtilities USING [Date, DateFormat, DateToRope, DirectoryItem, FileItem, Filter, GetVersionNumber, ImportsItem, IncludeItem, ParseFromStream, ProcessItemProc, RemoveVersionNumber, SyntaxError, WriteItemToStream],
FS USING [Copy, Create, Delete, Error, ExpandName, FileInfo, GetInfo, GetName, OpenFile, OpenFileFromStream, Rename, StreamFromOpenFile, StreamOpen],
FSPseudoServers USING [TranslateForWrite],
IO USING [Close, GetIndex, PutFR, PutFR1, STREAM],
Rope USING [Concat, Equal, Length, Match, Replace, ROPE, Run, SkipTo, Substr];
SModelImpl: CEDAR MONITOR
IMPORTS BasicTime, DFInternal, DFUtilities, FS, FSPseudoServers, IO, Rope
EXPORTS DFOperations = BEGIN

ROPE: TYPE = Rope.ROPE;
STREAM: TYPE = IO.STREAM;
nSModels: NAT _ 0;


SModel: PUBLIC PROC [dfFile: ROPE, action: DFOperations.SModelAction _ [], interact: DFOperations.InteractionProc _ NIL, clientData: REF ANY _ NIL, log: STREAM _ NIL] RETURNS [errors, warnings, filesActedUpon: INT _ 0] = {
client: DFInternal.Client = NEW[DFInternal.ClientDescriptor _ [
(interact _ IF interact = NIL THEN DFInternal.DefaultInteractionProc ELSE interact),
clientData,
log
]];
tempDF: ROPE = "SModelTemporaryDF$";
NewTemporaryDF: ENTRY PROC [pages: INT] RETURNS [out: STREAM] = {
outFile: FS.OpenFile;
nSModels _ nSModels.SUCC;
outFile _ 
FS.Create[
name: tempDF, pages: pages,
setKeep: TRUE, keep: IF nSModels = 1 THEN 1 ELSE CARDINAL.LAST
! FS.Error => {
localInfo: REF DFInternal.LocalFileInfo _ NEW[DFInternal.LocalFileInfo _ [name: tempDF]];
DFInternal.ReportFSError[error, localInfo, client, $abort];
}
];
RETURN[FS.StreamFromOpenFile[outFile, $write]]
};
CloseTemporaryDF: PROC [out: STREAM] RETURNS [tempName: ROPE] = {
outFile: FS.OpenFile = FS.OpenFileFromStream[out];
tempName _ outFile.GetName[].fullFName;  -- includes version number
out.Close[];
};
FinishWithTemporaryDF: ENTRY PROC [
tempName: ROPE, localName: ROPE, commit: BOOL _ TRUE] = {
IF commit THEN FS.Rename[from: tempName, to: localName]
ELSE FS.Delete[tempName];
nSModels _ nSModels.PRED;
};
UserConfirms: PROC [localInfo: REF DFInternal.LocalFileInfo, remoteInfo: REF DFInternal.RemoteFileInfo] RETURNS [BOOL] = {
RETURN[DFInternal.YesOrNo[
client: client,
message: 
IO.PutFR[
"%g {%g} to %g ?",
[rope[localInfo.name]],
[rope[DFUtilities.DateToRope[localInfo.date]]],
[rope[DFUtilities.RemoveVersionNumber[remoteInfo.name]]],
],
default: TRUE
]]
};
SModelInner: PROC [dfFile: ROPE, date: DFUtilities.Date] RETURNS [REF DFInternal.RemoteFileInfo] = {
directoryPath: ROPE _ NIL;
writeDirectoryPath: ROPE _ NIL;
directoryLen: INT _ 0;
somethingChanged: BOOL _ FALSE;
dfRemoteInfo: REF DFInternal.RemoteFileInfo = NEW[DFInternal.RemoteFileInfo _ [name: dfFile, date: date]];
dfLocalInfo: REF DFInternal.LocalFileInfo = NEW[DFInternal.LocalFileInfo _ [name: DFInternal.ShortName[dfFile]]];
DoOneItem: DFUtilities.ProcessItemProc = {
StoreThisFile: PROC [ localInfo: REF DFInternal.LocalFileInfo, remoteInfo: REF DFInternal.RemoteFileInfo, formatFromDF: DFUtilities.DateFormat] RETURNS [store: BOOL] = {
lGMT: BasicTime.GMT = localInfo.date.gmt;  -- can't be nullGMT
rGMT: BasicTime.GMT = remoteInfo.date.gmt;  -- may be nullGMT
IF localInfo.attachedTo.Length[] = 0 THEN RETURN[TRUE];
IF ~Rope.Equal[
DFUtilities.RemoveVersionNumber[remoteInfo.name],
DFUtilities.RemoveVersionNumber[localInfo.attachedTo],
FALSE] THEN {
IF remoteInfo.date = localInfo.date AND Rope.Equal[
DFInternal.ShortName[remoteInfo.name],
DFInternal.ShortName[localInfo.attachedTo],
FALSE] THEN {
[] _ FS.Copy[
to: DFUtilities.RemoveVersionNumber[localInfo.name],
from: remoteInfo.name,
wantedCreatedTime: remoteInfo.date.gmt,
remoteCheck: action.remoteCheck,
attach: TRUE
! FS.Error => GO TO storeAnyway
];
localInfo.date.format _ $omitted;
DFInternal.GetFileInfo[info: localInfo, remoteCheck: FALSE
! FS.Error => DFInternal.ReportFSError[error, localInfo, client, $abort]
];
RETURN[FALSE];
EXITS
storeAnyway => NULL;
};
RETURN[TRUE]
};
SELECT formatFromDF FROM
$explicit, $omitted => RETURN[lGMT ~= rGMT];
$notEqual => RETURN[action.remoteCheck AND lGMT ~= rGMT];
$greaterThan =>
SELECT TRUE FROM
~action.remoteCheck => RETURN[FALSE];
remoteInfo.date.format ~= $explicit => RETURN[TRUE];  -- no extant remote file
ENDCASE =>
SELECT BasicTime.Period[from: lGMT, to: rGMT] FROM
< 0 => RETURN[TRUE];
= 0 => RETURN[FALSE];
> 0 => {
warnings _ warnings.SUCC;
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.InfoInteraction _ [
class: $warning,
message: IO.PutFR["%g {%g} is referenced with '>' in the DF file but is older than the remote version %g {%g}.",
[rope[localInfo.name]],
[rope[DFUtilities.DateToRope[localInfo.date]]],
[rope[remoteInfo.name]],
[rope[DFUtilities.DateToRope[remoteInfo.date]]]
]
]]
];
RETURN[FALSE]
};
ENDCASE;
ENDCASE;
};
ReportMissing: PROC [localInfo: REF DFInternal.LocalFileInfo] = {
warnings _ warnings.SUCC;
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.InfoInteraction _ [
class: $warning,
message: IO.PutFR1["'%g' doesn't exist.", [rope[localInfo.name]]]
]]
];
};
SelfReference: PROC [shortName: ROPE] RETURNS [BOOL] = {
RETURN[shortName.Equal[dfLocalInfo.name, FALSE]] 
};
DFInternal.CheckAbort[client];
WITH item SELECT FROM 
directory: REF DFUtilities.DirectoryItem => {
directoryPath _ directory.path1 _ FS.ExpandName[directory.path1].fullFName;
directoryLen _ Rope.Length[directoryPath];
writeDirectoryPath _ TranslateHost[directoryPath];
};
file: REF DFUtilities.FileItem => {
shortName: ROPE = DFUtilities.RemoveVersionNumber[file.name];
localInfo: REF DFInternal.LocalFileInfo _ NEW[DFInternal.LocalFileInfo _ [shortName]];
remoteInfo: REF DFInternal.RemoteFileInfo _
NEW[DFInternal.RemoteFileInfo _ [
name: directoryPath.Concat[file.name],
date: file.date
]];
DFInternal.GetFileInfo[info: localInfo, remoteCheck: FALSE
! FS.Error =>
IF error.group = $user THEN {ReportMissing[localInfo]; GO TO skip}
ELSE DFInternal.ReportFSError[error, localInfo, client, $abort]
];
IF action.remoteCheck THEN {
CheckWriteInfo[Rope.Concat[writeDirectoryPath, file.name], localInfo, remoteInfo
! FS.Error => DFInternal.ReportFSError[error, remoteInfo, client, $abort];
];
};
remoteInfo.name _ DFUtilities.RemoveVersionNumber[remoteInfo.name];
SELECT TRUE FROM
SelfReference[shortName] => {
remoteDFInfo: REF DFInternal.RemoteFileInfo =
NEW[DFInternal.RemoteFileInfo _ [name: remoteInfo.name]];
CheckWriteInfo[TranslateHost[remoteDFInfo.name], localInfo, remoteDFInfo
! FS.Error => DFInternal.ReportFSError[error, remoteDFInfo, client, $abort];
];
IF remoteDFInfo.date.gmt ~= BasicTime.nullGMT AND
file.date.format = $explicit AND
BasicTime.Period[from: file.date.gmt, to: remoteDFInfo.date.gmt] > 0 AND
~DFInternal.YesOrNo[
client: client,
message: 
IO.PutFR[
"%g may be obsolete, since the remote version from which it is derived {%g} is older than %g {%g} (the present newest remote one); continue anyway?",
[rope[shortName]],
[rope[DFUtilities.DateToRope[file.date]]],
[rope[remoteDFInfo.name]],
[rope[DFUtilities.DateToRope[remoteDFInfo.date]]]
],
default: FALSE,
blunder: TRUE
] THEN DFInternal.DoAbort[client.log, "Obsolete self-reference; remote version is older than date in DF file."];
IF StoreThisFile[localInfo, remoteInfo, file.date.format] THEN
somethingChanged _ TRUE;  -- we'll actually store it later, if user approves.
dfRemoteInfo.name _ remoteInfo.name;  -- redundant unless top-level DF
file.name _ shortName;  -- ensure no version number
SELECT file.date.format FROM
$explicit, $omitted => file.date _ [$explicit, outFile.GetInfo[].created];
ENDCASE;
};
StoreThisFile[localInfo, remoteInfo, file.date.format]
AND UserConfirms[localInfo, remoteInfo] => {
somethingChanged _ TRUE;
IF action.storeChanged THEN {
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.FileInteraction _ [
localFile: localInfo.name,
remoteFile: remoteInfo.name,
dateFormat:
SELECT file.date.format FROM
$explicit => $explicit,
$greaterThan => $greaterThan,
ENDCASE => $notEqual,
date: localInfo.date.gmt,
action: store
]]
];
file.name _ FS.Copy[
to: remoteInfo.name, from: localInfo.name, attach: TRUE
! FS.Error => DFInternal.ReportFSError[error, remoteInfo, client, $abort]];
IF Rope.Run[file.name, 0, directoryPath, 0, FALSE] = directoryLen
THEN {
file.name _ Rope.Substr[file.name, directoryLen];
}
ELSE {
DFInternal.DoAbort[client.log, IO.PutFR1["Bogus file name (%g).", [rope[file.name]] ]];
};
};
filesActedUpon _ filesActedUpon.SUCC;
SELECT file.date.format FROM
$explicit, $omitted => file.date _ localInfo.date;
ENDCASE => file.name _ shortName;
};
ENDCASE =>
IF localInfo.attachedTo.Length ~= 0 THEN {
remoteVersion: ROPE = DFUtilities.GetVersionNumber[localInfo.attachedTo];
IF ~remoteVersion.Equal[DFUtilities.GetVersionNumber[file.name]] THEN {
file.name _ shortName.Concat[remoteVersion];
somethingChanged _ TRUE;
};
SELECT file.date.format FROM
$omitted => {
file.date _ localInfo.date;
somethingChanged _ TRUE;
};
$explicit =>
IF file.date ~= localInfo.date THEN {
file.date _ localInfo.date;
somethingChanged _ TRUE;
};
ENDCASE;
};
EXITS
skip => NULL;
};
include: REF DFUtilities.IncludeItem => {
path: ROPE _ include.path1 _ FS.ExpandName[include.path1].fullFName;
remoteInfo: REF DFInternal.RemoteFileInfo = SModelInner[path, include.date];
IF ~Rope.Equal[remoteInfo.name, path, FALSE] THEN {
include.path1 _ remoteInfo.name;
somethingChanged _ TRUE};
SELECT include.date.format FROM
$explicit, $omitted => {
include.date _ remoteInfo.date;
somethingChanged _ TRUE};
ENDCASE => include.path1 _ DFUtilities.RemoveVersionNumber[include.path1];
};
imports: REF DFUtilities.ImportsItem => {
localInfo: REF DFInternal.LocalFileInfo =
NEW[DFInternal.LocalFileInfo _ [name: DFInternal.ShortName[imports.path1]]];
remoteInfo: REF DFInternal.RemoteFileInfo =
NEW[DFInternal.RemoteFileInfo _ [name: imports.path1, date: imports.date]];
DFInternal.GetFileInfo[info: localInfo, remoteCheck: FALSE
! FS.Error =>
IF error.group = $user THEN {ReportMissing[localInfo]; GO TO skip}
ELSE DFInternal.ReportFSError[error, localInfo, client, $abort]
];
SELECT TRUE FROM
localInfo.date.gmt = BasicTime.nullGMT => {
warnings _ warnings.SUCC;
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.InfoInteraction _ [
class: $warning,
message: IO.PutFR1["Local import %g not found.",
[rope[localInfo.name]]
]
]]
];
};
imports.date.format = $explicit AND imports.date.gmt # localInfo.date.gmt => {
warnings _ warnings.SUCC;
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.InfoInteraction _ [
class: $warning,
message: IO.PutFR["Local import %g does not have requested date.",
[rope[localInfo.name]], [rope[DFUtilities.DateToRope[localInfo.date]]]
]
]]
];
};
ENDCASE;
IF action.remoteCheck THEN {
CheckWriteInfo[remoteInfo.name, localInfo, remoteInfo
! FS.Error => DFInternal.ReportFSError[error, remoteInfo, client, $abort];
];
IF localInfo.date.gmt # remoteInfo.date.gmt THEN {
warnings _ warnings.SUCC;
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.InfoInteraction _ [
class: $warning,
message: IO.PutFR["%g {%g} doesn't correspond to %g {%g}.",
[rope[localInfo.name]], [rope[DFUtilities.DateToRope[localInfo.date]]],
[rope[remoteInfo.name]], [rope[DFUtilities.DateToRope[remoteInfo.date]]]
]
]]
];
};
imports.path1 _ remoteInfo.name;
};
SELECT imports.date.format FROM
$explicit => NULL;
$omitted => {imports.date _ localInfo.date; somethingChanged _ TRUE};
ENDCASE => imports.path1 _ DFUtilities.RemoveVersionNumber[imports.path1];
EXITS
skip => NULL;
};
ENDCASE;
DFUtilities.WriteItemToStream[out, item];
};
in: STREAM = FS.StreamOpen[dfLocalInfo.name, $read
! FS.Error => DFInternal.ReportFSError[error, dfLocalInfo, client, $abort]
];
inFile: FS.OpenFile = FS.OpenFileFromStream[in];
out: STREAM = NewTemporaryDF[inFile.GetInfo[].pages];
outFile: FS.OpenFile = FS.OpenFileFromStream[out];
dfLocalInfo.date _ [$explicit, inFile.GetInfo[].created];
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.DFInfoInteraction _ [action: start, dfFile: dfLocalInfo.name]]
];
DFUtilities.ParseFromStream[in, DoOneItem, DFUtilities.Filter[comments: TRUE] !
DFUtilities.SyntaxError -- [reason: ROPE]-- =>
DFInternal.DoAbort[
log,
IO.PutFR["Syntax error in '%g'[%d]: %g",
[rope[dfLocalInfo.name]], [cardinal[in.GetIndex[]]], [rope[reason]]
],
interact,
clientData
];
DFInternal.AbortDF => {
in.Close[];
FinishWithTemporaryDF[CloseTemporaryDF[out], NIL, FALSE];
};
];
in.Close[];
dfLocalInfo.date.gmt _ outFile.GetInfo[].created;
IF somethingChanged AND UserConfirms[dfLocalInfo, dfRemoteInfo]
THEN {
tempName: ROPE = CloseTemporaryDF[out];
dfRemoteDateFormat: DFUtilities.DateFormat = dfRemoteInfo.date.format;
dfRemoteInfo.date _ dfLocalInfo.date;
IF action.storeChanged THEN {
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.FileInteraction _ [
localFile: dfLocalInfo.name,
remoteFile: dfRemoteInfo.name,
dateFormat:
SELECT dfRemoteDateFormat FROM
$explicit => $explicit,
$greaterThan => $greaterThan,
ENDCASE => $notEqual,
date: dfLocalInfo.date.gmt,
action: $store
]]
];
[] _ FS.Copy[to: dfRemoteInfo.name, from: tempName, attach: TRUE
! FS.Error => DFInternal.ReportFSError[error, dfRemoteInfo, client, $abort]];
FinishWithTemporaryDF[tempName, dfLocalInfo.name];
};
filesActedUpon _ filesActedUpon.SUCC;
}
ELSE FinishWithTemporaryDF[CloseTemporaryDF[out], NIL, FALSE];
DFInternal.SimpleInteraction[
client,
NEW[DFOperations.DFInfoInteraction _ [
action: end,
dfFile: dfLocalInfo.name,
message: IF somethingChanged THEN NIL ELSE "DF file is unchanged"
]]
];
RETURN[dfRemoteInfo]
};
[] _ SModelInner[dfFile, [] !
ABORTED => {
DFInternal.SimpleInteraction[client, NEW[DFOperations.AbortInteraction _ [TRUE]]];
};
DFInternal.AbortDF => {
errors _ errors.SUCC;
DFInternal.SimpleInteraction[client, NEW[DFOperations.DFInfoInteraction _ [action: $abort, dfFile: dfFile]]];
CONTINUE
};
];
};

CheckWriteInfo: PROC [path: ROPE, localInfo: REF DFInternal.LocalFileInfo, remoteInfo: REF DFInternal.RemoteFileInfo] = {
remoteInfo.date.gmt _ FS.FileInfo[
name: path,
wantedCreatedTime: localInfo.date.gmt
! FS.Error =>
SELECT error.code FROM
$unknownCreatedTime, $unknownFile => {
remoteInfo.date.gmt _ BasicTime.nullGMT;
remoteInfo.date.format _ $omitted;
CONTINUE;
};
ENDCASE;
].created;
};

TranslateHost: PROC [path: ROPE] RETURNS [ROPE] = {
IF Rope.Match["[*]*", path] THEN {
rPos: INT _ Rope.SkipTo[path, 1, "]"];
host: ROPE _ Rope.Substr[path, 1, rPos-1];
writeHost: ROPE _ FSPseudoServers.TranslateForWrite[host];
IF NOT Rope.Equal[host, writeHost, FALSE] THEN
RETURN [Rope.Replace[path, 1, rPos-1, writeHost]];
};
RETURN [path];
};

END.
.SModelImpl.mesa
Copyright c 1984, 1985 by Xerox Corporation.  All rights reserved.
Bob Hagmann on May 18, 1984 9:04:25 am PDT
Russ Atkinson (RRA) October 28, 1985 9:39:27 pm PST

Global (monitored) variables

Exported to DFOperations
This procedure returns TRUE if, in principle, the file should be stored.  It does not alter either 'localInfo' or 'remoteInfo' and does not let the user influence its decision.
If the local file is not attached, we store it anyway, so that the attachment will be made.
If the local file is attached to a remote file whose name differs from the one specified in the DF, we store it even if the dates match, so that the proper attachment will be made.
If the short names of the two files are the same and they have the same date, we assume that the remote file is good enough.  We need to make an attachment "the other way", however, and prevent the main loop from doing anything.
force GetFileInfo to get the highest number version (that we just wrote)
update attachedTo
The following tests need to be done delicately, since we may not know the actual truth about the remote file, but only what the DF file claims is true.  In particular, it is quite possible that remoteDate.gmt = nullGMT when a remote file actually exists.  (This case arises if formatFromDF ~= $explicit and ~action.remoteCheck.)
Get the directory in angle-bracket format
The local file is known to exist.  Any remote file with whose date matches will be satisfactory.  Note that remoteInfo.name will typically have a version (hint).  We do the checking with the name suitably translated for the write server, since that gets around extra checking on the read servers, which are allowed to lag the write server anyway.
At this point, remoteInfo.date.format will be $explicit if we are supposed to believe that there is a remote file with create date remoteInfo.date.gmt, and remoteInfo.date.format will be $omitted if we are supposed to believe no such file exists.  Furthermore, remoteInfo.name has no version number.
This file item is a reference to the DF file we are updating.  We check to see if the !H version on the remote server is newer than the input version of the DF file.  If so, the user is warned, since he is probably using an obsolete DF file.
Factor out the directory path
If the file's date and/or (remote) version number is missing or incorrect, we may wish to update them/it.  Because of the logic on the earlier call of GetFileInfo, the local file is known to exist.  However, it may or may not be attached to a remote file, since the user may have explicitly prohibited a Copy in the preceding arm of the SELECT.  If it isn't attached, we don't want to disturb the DF file entry.
We would like to RESUME at this point, but until ABORTED is redeclared as a SIGNAL, it won't work.
File not found, so just continue with updated info
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