pjs/extensions/xforms/nsXFormsUtilityService.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 XForms support.
*
* The Initial Developer of the Original Code is
* IBM Corporation.
* Portions created by the Initial Developer are Copyright (C) 2004
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Aaron Reed <aaronr@us.ibm.com>
*
* 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 ***** */
#include "nsIServiceManager.h"
#include "nsXFormsUtilityService.h"
#include "nsXFormsUtils.h"
#include "nsIXTFElement.h"
#include "nsIDOMNode.h"
#include "nsIDOMElement.h"
#include "nsString.h"
#include "nsIDOMDocument.h"
#include "nsIXFormsModelElement.h"
#include "nsIDOMNodeList.h"
#include "nsIInstanceElementPrivate.h"
#include "nsIXFormsRepeatElement.h"
#include "nsISchemaValidator.h"
#include "nsISchemaDuration.h"
#include "nsXFormsSchemaValidator.h"
#include "prdtoa.h"
NS_IMPL_ISUPPORTS1(nsXFormsUtilityService, nsIXFormsUtilityService)
/* I don't know why Doron didn't put this in the .idl so that it could be added
* to the generated .h file. Put it here for now
*/
#define NS_SCHEMAVALIDATOR_CONTRACTID "@mozilla.org/schemavalidator;1"
NS_IMETHODIMP
nsXFormsUtilityService::GetModelFromNode(nsIDOMNode *aNode,
nsIDOMNode **aModel)
{
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aNode);
NS_ASSERTION(aModel, "no return buffer, we'll crash soon");
*aModel = nsnull;
nsAutoString namespaceURI;
aNode->GetNamespaceURI(namespaceURI);
// If the node is in the XForms namespace and XTF based, then it should
// be able to be handled by GetModel. Otherwise it is probably an instance
// node in a instance document.
if (!namespaceURI.EqualsLiteral(NS_NAMESPACE_XFORMS)) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIModelElementPrivate> modelPriv = nsXFormsUtils::GetModel(element);
nsCOMPtr<nsIDOMNode> modelElement = do_QueryInterface(modelPriv);
if( modelElement ) {
NS_IF_ADDREF(*aModel = modelElement);
}
// No model found
NS_ENSURE_TRUE(*aModel, NS_ERROR_FAILURE);
return NS_OK;
}
/**
* Function to see if the given node is associated with the given model.
* Right now this function is only called by XPath in the case of the
* instance() function.
* The provided node can be an instance node from an instance
* document and thus be associated to the model in that way (model elements
* contain instance elements). Otherwise the node will be an XForms element
* that was used as the context node of the XPath expression (i.e the
* XForms control has an attribute that contains an XPath expression).
* Form controls are associated with model elements either explicitly through
* single-node binding or implicitly (if model cannot by calculated, it
* will use the first model element encountered in the document). The model
* can also be inherited from a containing element like xforms:group or
* xforms:repeat.
*/
NS_IMETHODIMP
nsXFormsUtilityService::IsNodeAssocWithModel( nsIDOMNode *aNode,
nsIDOMNode *aModel,
PRBool *aModelAssocWithNode)
{
nsCOMPtr<nsIDOMNode> modelNode;
nsAutoString namespaceURI;
aNode->GetNamespaceURI(namespaceURI);
// If the node is in the XForms namespace and XTF based, then it should
// be able to be handled by GetModel. Otherwise it is probably an instance
// node in a instance document.
if (namespaceURI.EqualsLiteral(NS_NAMESPACE_XFORMS)) {
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(aNode);
nsCOMPtr<nsIModelElementPrivate> modelPriv = nsXFormsUtils::GetModel(element);
modelNode = do_QueryInterface(modelPriv);
} else {
// We are assuming that if the node coming in isn't a proper XForms element,
// then it is an instance element in an instance doc. Now we just have
// to determine if the given model contains this instance document.
nsCOMPtr<nsIDOMNode> instNode;
nsresult rv =
nsXFormsUtils::GetInstanceNodeForData(aNode, getter_AddRefs(instNode));
if (NS_SUCCEEDED(rv) && instNode) {
instNode->GetParentNode(getter_AddRefs(modelNode));
}
}
if (modelNode && (modelNode == aModel)) {
*aModelAssocWithNode = PR_TRUE;
} else {
*aModelAssocWithNode = PR_FALSE;
}
return NS_OK;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetInstanceDocumentRoot(const nsAString& aID,
nsIDOMNode *aModelNode,
nsIDOMNode **aInstanceRoot)
{
nsresult rv = NS_ERROR_FAILURE;
NS_ASSERTION(aInstanceRoot, "no return buffer, we'll crash soon");
*aInstanceRoot = nsnull;
if (aID.IsEmpty()) {
return rv;
}
nsCOMPtr<nsIXFormsModelElement> modelElement = do_QueryInterface(aModelNode);
nsCOMPtr<nsIDOMDocument> doc;
rv = modelElement->GetInstanceDocument(aID, getter_AddRefs(doc));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMElement> element;
rv = doc->GetDocumentElement(getter_AddRefs(element));
NS_ENSURE_SUCCESS(rv, rv);
if (element) {
NS_IF_ADDREF(*aInstanceRoot = element);
}
return rv;
}
/* Gotta do this via the service since we don't want transformiix to require
* any of the new extensions, like schema-validation
*/
NS_IMETHODIMP
nsXFormsUtilityService::ValidateString(const nsAString & aValue,
const nsAString & aType,
const nsAString & aNamespace,
PRBool *aResult)
{
NS_ASSERTION(aResult, "no return buffer for result so we'll crash soon");
*aResult = PR_FALSE;
nsXFormsSchemaValidator *validator = new nsXFormsSchemaValidator();
if (validator) {
*aResult = validator->ValidateString(aValue, aType, aNamespace);
delete validator;
}
return *aResult ? NS_OK : NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetRepeatIndex(nsIDOMNode *aRepeat, PRUint32 *aIndex)
{
NS_ASSERTION(aIndex, "no return buffer for index, we'll crash soon");
*aIndex = 0;
nsCOMPtr<nsIXFormsRepeatElement> repeatEle = do_QueryInterface(aRepeat);
///
/// @bug This should somehow end up in a NaN per the XForms 1.0 Errata (XXX)
return repeatEle ? repeatEle->GetIndex(aIndex) : NS_OK;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetMonths(const nsAString & aValue,
PRInt32 * aMonths)
{
NS_ASSERTION(aMonths, "no return buffer for months, we'll crash soon");
*aMonths = 0;
nsCOMPtr<nsISchemaDuration> duration;
nsCOMPtr<nsISchemaValidator> schemaValidator =
do_GetService(NS_SCHEMAVALIDATOR_CONTRACTID);
NS_ENSURE_TRUE(schemaValidator, NS_ERROR_FAILURE);
nsresult rv = schemaValidator->ValidateBuiltinTypeDuration(aValue,
getter_AddRefs(duration));
NS_ENSURE_SUCCESS(rv, rv);
PRInt32 sumMonths;
PRUint32 years;
PRUint32 months;
duration->GetYears(&years);
duration->GetMonths(&months);
sumMonths = months + years*12;
PRBool negative;
duration->GetNegative(&negative);
if (negative) {
// according to the spec, "the sign of the result will match the sign
// of the duration"
sumMonths *= -1;
}
*aMonths = sumMonths;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetSeconds(const nsAString & aValue,
double * aSeconds)
{
nsCOMPtr<nsISchemaDuration> duration;
nsCOMPtr<nsISchemaValidator> schemaValidator =
do_GetService(NS_SCHEMAVALIDATOR_CONTRACTID);
NS_ENSURE_TRUE(schemaValidator, NS_ERROR_FAILURE);
nsresult rv = schemaValidator->ValidateBuiltinTypeDuration(aValue,
getter_AddRefs(duration));
NS_ENSURE_SUCCESS(rv, rv);
double sumSeconds;
PRUint32 days;
PRUint32 hours;
PRUint32 minutes;
PRUint32 seconds;
double fractSecs;
duration->GetDays(&days);
duration->GetHours(&hours);
duration->GetMinutes(&minutes);
duration->GetSeconds(&seconds);
duration->GetFractionSeconds(&fractSecs);
sumSeconds = seconds + minutes*60 + hours*3600 + days*24*3600 + fractSecs;
PRBool negative;
duration->GetNegative(&negative);
if (negative) {
// according to the spec, "the sign of the result will match the sign
// of the duration"
sumSeconds *= -1;
}
*aSeconds = sumSeconds;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetSecondsFromDateTime(const nsAString & aValue,
double * aSeconds)
{
PRTime dateTime;
nsCOMPtr<nsISchemaValidator> schemaValidator =
do_GetService(NS_SCHEMAVALIDATOR_CONTRACTID);
NS_ENSURE_TRUE(schemaValidator, NS_ERROR_FAILURE);
nsresult rv = schemaValidator->ValidateBuiltinTypeDateTime(aValue, &dateTime);
NS_ENSURE_SUCCESS(rv, rv);
PRTime secs64 = dateTime, remain64;
PRInt64 usecPerSec;
PRInt32 secs32, remain32;
// convert from PRTime (microseconds from epoch) to seconds.
LL_I2L(usecPerSec, PR_USEC_PER_SEC);
LL_MOD(remain64, secs64, usecPerSec); /* remainder after conversion */
LL_DIV(secs64, secs64, usecPerSec); /* Conversion in whole seconds */
// convert whole seconds and remainder to PRInt32
LL_L2I(secs32, secs64);
LL_L2I(remain32, remain64);
// ready the result to send back to transformiix land now in case there are
// no fractional seconds or we end up having a problem parsing them out. If
// we do, we'll just ignore the fractional seconds.
double totalSeconds = secs32;
*aSeconds = totalSeconds;
// We're not getting fractional seconds back in the PRTime we get from
// the schemaValidator. We'll have to figure out the fractions from
// the original value. Since ValidateBuiltinTypeDateTime returned
// successful for us to get this far, we know that the value is in
// the proper format.
int findFractionalSeconds = aValue.FindChar('.');
if (findFractionalSeconds < 0) {
// no fractions of seconds, so we are good to go as we are
return NS_OK;
}
const nsAString& fraction = Substring(aValue, findFractionalSeconds+1,
aValue.Length());
PRBool done = PR_FALSE;
PRUnichar currentChar;
nsCAutoString fractionResult;
nsAString::const_iterator start, end, buffStart;
fraction.BeginReading(start);
fraction.BeginReading(buffStart);
fraction.EndReading(end);
while ((start != end) && !done) {
currentChar = *start++;
// Time is usually terminated with Z or followed by a time zone
// (i.e. -05:00). Time can also be terminated by the end of the string, so
// test for that as well. All of this specified at:
// http://www.w3.org/TR/xmlschema-2/#dateTime
if ((currentChar == 'Z') || (currentChar == '+') || (currentChar == '-') ||
(start == end)) {
fractionResult.AssignLiteral("0.");
AppendUTF16toUTF8(Substring(buffStart.get(), start.get()-1),
fractionResult);
} else if ((currentChar > '9') || (currentChar < '0')) {
// has to be a numerical character or else abort. This should have been
// caught by the schemavalidator, but it is worth double checking.
done = PR_TRUE;
}
}
if (fractionResult.IsEmpty()) {
// couldn't successfully parse the fractional seconds, so we'll just return
// without them.
return NS_OK;
}
// convert the result string that we have to a double and add it to the total
totalSeconds += PR_strtod(fractionResult.get(), nsnull);
*aSeconds = totalSeconds;
return NS_OK;
}
NS_IMETHODIMP
nsXFormsUtilityService::GetDaysFromDateTime(const nsAString & aValue,
PRInt32 * aDays)
{
NS_ASSERTION(aDays, "no return buffer for days, we'll crash soon");
*aDays = 0;
PRTime date;
nsCOMPtr<nsISchemaValidator> schemaValidator =
do_GetService(NS_SCHEMAVALIDATOR_CONTRACTID);
NS_ENSURE_TRUE(schemaValidator, NS_ERROR_FAILURE);
// aValue could be a xsd:date or a xsd:dateTime. If it is a dateTime, we
// should ignore the hours, minutes, and seconds according to 7.10.2 in
// the spec. So search for such things now. If they are there, strip 'em.
int findTime = aValue.FindChar('T');
nsAutoString dateString;
dateString.Assign(aValue);
if (findTime >= 0) {
dateString.Assign(Substring(dateString, 0, findTime));
}
nsresult rv = schemaValidator->ValidateBuiltinTypeDate(dateString, &date);
NS_ENSURE_SUCCESS(rv, rv);
PRTime secs64 = date;
PRInt64 usecPerSec;
PRInt32 secs32;
// convert from PRTime (microseconds from epoch) to seconds. Shouldn't
// have to worry about remainders since input is a date. Smallest value
// is in whole days.
LL_I2L(usecPerSec, PR_USEC_PER_SEC);
LL_DIV(secs64, secs64, usecPerSec);
// convert whole seconds to PRInt32
LL_L2I(secs32, secs64);
// convert whole seconds to days. 86400 seconds in a day.
*aDays = secs32/86400;
return NS_OK;
}