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/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
function makeChangesetTracker(scheduler, apool, aceCallbacksProvider) {
// latest official text from server
var baseAText = Changeset.makeAText("\n");
// changes applied to baseText that have been submitted
var submittedChangeset = null;
// changes applied to submittedChangeset since it was prepared
var userChangeset = Changeset.identity(1);
// is the changesetTracker enabled
var tracking = false;
// stack state flag so that when we change the rep we don't
// handle the notification recursively. When setting, always
// unset in a "finally" block. When set to true, the setter
// takes change of userChangeset.
var applyingNonUserChanges = false;
var changeCallback = null;
var changeCallbackTimeout = null;
function setChangeCallbackTimeout() {
// can call this multiple times per call-stack, because
// we only schedule a call to changeCallback if it exists
// and if there isn't a timeout already scheduled.
if (changeCallback && changeCallbackTimeout === null) {
changeCallbackTimeout = scheduler.setTimeout(function() {
try {
changeCallback();
}
finally {
changeCallbackTimeout = null;
}
}, 0);
}
}
var self;
return self = {
isTracking: function() { return tracking; },
setBaseText: function(text) {
self.setBaseAttributedText(Changeset.makeAText(text), null);
},
setBaseAttributedText: function(atext, apoolJsonObj) {
aceCallbacksProvider.withCallbacks("setBaseText", function(callbacks) {
tracking = true;
baseAText = Changeset.cloneAText(atext);
if (apoolJsonObj) {
var wireApool = (new AttribPool()).fromJsonable(apoolJsonObj);
baseAText.attribs = Changeset.moveOpsToNewPool(baseAText.attribs, wireApool, apool);
}
submittedChangeset = null;
userChangeset = Changeset.identity(atext.text.length);
applyingNonUserChanges = true;
try {
callbacks.setDocumentAttributedText(atext);
}
finally {
applyingNonUserChanges = false;
}
});
},
composeUserChangeset: function(c) {
if (! tracking) return;
if (applyingNonUserChanges) return;
if (Changeset.isIdentity(c)) return;
userChangeset = Changeset.compose(userChangeset, c, apool);
setChangeCallbackTimeout();
},
applyChangesToBase: function (c, optAuthor, apoolJsonObj) {
if (! tracking) return;
aceCallbacksProvider.withCallbacks("applyChangesToBase", function(callbacks) {
if (apoolJsonObj) {
var wireApool = (new AttribPool()).fromJsonable(apoolJsonObj);
c = Changeset.moveOpsToNewPool(c, wireApool, apool);
}
baseAText = Changeset.applyToAText(c, baseAText, apool);
var c2 = c;
if (submittedChangeset) {
var oldSubmittedChangeset = submittedChangeset;
submittedChangeset = Changeset.follow(c, oldSubmittedChangeset, false, apool);
c2 = Changeset.follow(oldSubmittedChangeset, c, true, apool);
}
var preferInsertingAfterUserChanges = true;
var oldUserChangeset = userChangeset;
userChangeset = Changeset.follow(c2, oldUserChangeset, preferInsertingAfterUserChanges, apool);
var postChange =
Changeset.follow(oldUserChangeset, c2, ! preferInsertingAfterUserChanges, apool);
var preferInsertionAfterCaret = true; //(optAuthor && optAuthor > thisAuthor);
applyingNonUserChanges = true;
try {
callbacks.applyChangesetToDocument(postChange, preferInsertionAfterCaret);
}
finally {
applyingNonUserChanges = false;
}
});
},
prepareUserChangeset: function() {
// If there are user changes to submit, 'changeset' will be the
// changeset, else it will be null.
var toSubmit;
if (submittedChangeset) {
// submission must have been canceled, prepare new changeset
// that includes old submittedChangeset
toSubmit = Changeset.compose(submittedChangeset, userChangeset, apool);
}
else {
if (Changeset.isIdentity(userChangeset)) toSubmit = null;
else toSubmit = userChangeset;
}
var cs = null;
if (toSubmit) {
submittedChangeset = toSubmit;
userChangeset = Changeset.identity(Changeset.newLen(toSubmit));
cs = toSubmit;
}
var wireApool = null;
if (cs) {
var forWire = Changeset.prepareForWire(cs, apool);
wireApool = forWire.pool.toJsonable();
cs = forWire.translated;
}
var data = { changeset: cs, apool: wireApool };
return data;
},
applyPreparedChangesetToBase: function() {
if (! submittedChangeset) {
// violation of protocol; use prepareUserChangeset first
throw new Error("applySubmittedChangesToBase: no submitted changes to apply");
}
//bumpDebug("applying committed changeset: "+submittedChangeset.encodeToString(false));
baseAText = Changeset.applyToAText(submittedChangeset, baseAText, apool);
submittedChangeset = null;
},
setUserChangeNotificationCallback: function (callback) {
changeCallback = callback;
},
hasUncommittedChanges: function() {
return !!(submittedChangeset || (! Changeset.isIdentity(userChangeset)));
}
};
}
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