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calIcsParser.js
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/* -*- Mode: javascript; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Calendar code.
*
* The Initial Developer of the Original Code is
* Michiel van Leeuwen <mvl@exedo.nl>.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
function calIcsParser() {
this.wrappedJSObject = this;
this.mItems = new Array();
this.mParentlessItems = new Array();
this.mComponents = new Array();
this.mProperties = new Array();
}
calIcsParser.prototype.QueryInterface =
function QueryInterface(aIID) {
if (!aIID.equals(Components.interfaces.nsISupports) &&
!aIID.equals(Components.interfaces.calIIcsParser)) {
throw Components.results.NS_ERROR_NO_INTERFACE;
}
return this;
};
calIcsParser.prototype.parseString =
function ip_parseString(aICSString, aTzProvider) {
var rootComp = getIcsService().parseICS(aICSString, aTzProvider);
var calComp;
// libical returns the vcalendar component if there is just one vcalendar.
// If there are multiple vcalendars, it returns an xroot component, with
// those vcalendar children. We need to handle both.
if (rootComp.componentType == 'VCALENDAR') {
calComp = rootComp;
} else {
calComp = rootComp.getFirstSubcomponent('VCALENDAR');
}
var unexpandedItems = [];
var uid2parent = {};
var excItems = [];
while (calComp) {
// Get unknown properties
var prop = calComp.getFirstProperty("ANY");
while (prop) {
if (prop.propertyName != "VERSION" &&
prop.propertyName != "PRODID") {
this.mProperties.push(prop);
}
prop = calComp.getNextProperty("ANY");
}
var prodId = calComp.getFirstProperty("PRODID");
var isFromOldSunbird;
if (prodId) {
isFromOldSunbird = prodId.value == "-//Mozilla.org/NONSGML Mozilla Calendar V1.0//EN";
}
var subComp = calComp.getFirstSubcomponent("ANY");
while (subComp) {
var item = null;
switch (subComp.componentType) {
case "VEVENT":
item = Components.classes["@mozilla.org/calendar/event;1"]
.createInstance(Components.interfaces.calIEvent);
break;
case "VTODO":
item = Components.classes["@mozilla.org/calendar/todo;1"]
.createInstance(Components.interfaces.calITodo);
break;
case "VTIMEZONE":
// this should already be attached to the relevant
// events in the calendar, so there's no need to
// do anything with it here.
break;
default:
this.mComponents.push(subComp);
}
if (item) {
item.icalComponent = subComp;
// Only try to fix ICS from Sunbird 0.2 (and earlier) if it
// has an EXDATE.
hasExdate = subComp.getFirstProperty("EXDATE");
if (isFromOldSunbird && hasExdate) {
item = fixOldSunbirdExceptions(item);
}
var rid = item.recurrenceId;
if (!rid) {
unexpandedItems.push(item);
if (item.recurrenceInfo) {
uid2parent[item.id] = item;
}
} else {
// force no recurrence info:
item.recurrenceInfo = null;
excItems.push(item);
}
}
subComp = calComp.getNextSubcomponent("ANY");
}
calComp = rootComp.getNextSubcomponent("VCALENDAR");
}
// tag "exceptions", i.e. items with rid:
for each (var item in excItems) {
var parent = uid2parent[item.id];
if (parent) {
item.parentItem = parent;
parent.recurrenceInfo.modifyException(item);
} else { // a parentless one
this.mParentlessItems.push(item);
}
}
for each (var item in unexpandedItems) {
this.mItems.push(item);
}
};
calIcsParser.prototype.parseFromStream =
function ip_parseFromStream(aStream, aTzProvider) {
// Read in the string. Note that it isn't a real string at this point,
// because likely, the file is utf8. The multibyte chars show up as multiple
// 'chars' in this string. So call it an array of octets for now.
var octetArray = [];
var binaryIS = Components.classes["@mozilla.org/binaryinputstream;1"]
.createInstance(Components.interfaces.nsIBinaryInputStream);
binaryIS.setInputStream(aStream);
octetArray = binaryIS.readByteArray(binaryIS.available());
// Some other apps (most notably, sunbird 0.2) happily splits an UTF8
// character between the octets, and adds a newline and space between them,
// for ICS folding. Unfold manually before parsing the file as utf8.This is
// UTF8 safe, because octets with the first bit 0 are always one-octet
// characters. So the space or the newline never can be part of a multi-byte
// char.
for (var i = octetArray.length - 2; i >= 0; i--) {
if (octetArray[i] == "\n" && octetArray[i+1] == " ") {
octetArray = octetArray.splice(i, 2);
}
}
// Interpret the byte-array as a UTF8-string, and convert into a
// javascript string.
var unicodeConverter = Components.classes["@mozilla.org/intl/scriptableunicodeconverter"]
.createInstance(Components.interfaces.nsIScriptableUnicodeConverter);
// ICS files are always UTF8
unicodeConverter.charset = "UTF-8";
var str = unicodeConverter.convertFromByteArray(octetArray, octetArray.length);
return this.parseString(str, aTzProvider);
}
calIcsParser.prototype.getItems =
function ip_getItems(aCount) {
aCount.value = this.mItems.length;
return this.mItems.concat([]); //clone
}
calIcsParser.prototype.getParentlessItems =
function ip_getParentlessItems(aCount) {
aCount.value = this.mParentlessItems.length;
return this.mParentlessItems.concat([]); //clone
}
calIcsParser.prototype.getProperties =
function ip_getProperties(aCount) {
aCount.value = this.mProperties.length;
return this.mProperties.concat([]); //clone
}
calIcsParser.prototype.getComponents =
function ip_getComponents(aCount) {
aCount.value = this.mComponents.length;
return this.mComponents.concat([]); //clone
}
// Helper function to deal with the busted exdates from Sunbird 0.2
// When Sunbird 0.2 (and earlier) creates EXDATEs, they are set to
// 00:00:00 floating rather than to the item's DTSTART. This fixes that.
// (bug 354073)
function fixOldSunbirdExceptions(aItem) {
const kCalIRecurrenceDate = Components.interfaces.calIRecurrenceDate;
var item = aItem;
var ritems = aItem.recurrenceInfo.getRecurrenceItems({});
for each (var ritem in ritems) {
// EXDATEs are represented as calIRecurrenceDates, which are
// negative and finite.
if (ritem instanceof kCalIRecurrenceDate &&
ritem.isNegative &&
ritem.isFinite) {
// Only mess with the exception if its time is wrong.
var oldDate = aItem.startDate || aItem.entryDate;
if (ritem.date.compare(oldDate) != 0) {
var newRitem = ritem.clone();
// All we want from aItem is the time and timezone.
newRitem.date.timezone = oldDate.timezone;
newRitem.date.hour = oldDate.hour;
newRitem.date.minute = oldDate.minute;
newRitem.date.second = oldDate.second;
item.recurrenceInfo.appendRecurrenceItem(newRitem);
item.recurrenceInfo.deleteRecurrenceItem(ritem);
}
}
}
return item;
}