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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdynamiccontextstore_p.h"
#include "qpatternistlocale_p.h"
#include "qtemplate_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
const SourceLocationReflection* Template::actualReflection() const
{
return this;
}
DynamicContext::TemplateParameterHash Template::parametersAsHash() const
{
DynamicContext::TemplateParameterHash retval;
const int len = templateParameters.count();
for(int i = 0; i < len; ++i)
{
const VariableDeclaration::Ptr &at = templateParameters.at(i);
retval.insert(at->name, at->expression());
}
return retval;
}
void Template::raiseXTSE0680(const ReportContext::Ptr &context,
const QXmlName &name,
const SourceLocationReflection *const reflection)
{
context->error(QtXmlPatterns::tr("The parameter %1 is passed, but no corresponding %2 exists.")
.arg(formatKeyword(context->namePool(), name),
formatKeyword(QLatin1String("xsl:param"))),
ReportContext::XTSE0680,
reflection);
}
DynamicContext::Ptr Template::createContext(const TemplateInvoker *const invoker,
const DynamicContext::Ptr &context,
const bool isCallTemplate) const
{
Q_ASSERT(invoker);
Q_ASSERT(context);
/* We have:
* - xsl:params in the target template (if any) which may provide
* default values.
* - xsl:with-params in the caller (if any) which provides values.
*
* We need to, for each parameter:
* - If the called template provides no default value and the caller
* has no value, it's an error
* - If the called template has a default value and the caller provides
* none, it should be used
* - In any case the caller provides a value, it needs to be used.
*
* Problems to look out for:
*
* - Each xsl:param is in scope for the subsequent xsl:params. Hence,
* the evaluation of one xsl:param can depend on another xsl:param,
* and so on
* - The focus for xsl:params is different from the focus for
* the xsl:with-params
* - The xsl:with-params are not in scope for the xsl:params.
*/
WithParam::Hash withParams(invoker->withParams());
/**
* Parameters or not, we must in any case create a new stack frame
* for the template invocation since otherwise we will trash our existing
* variables. Hence it's as with calling user functions.
*
* This is especially reproducible with recursive functions.
*/
DynamicContext::Ptr newStack(context->createStack());
/* We have no parameters, and we have no further error checking to
* do in the case of not being xsl:apply-templates, so we need to do nothing. */
if(templateParameters.isEmpty() && (!isCallTemplate || withParams.isEmpty()))
return newStack;
const DynamicContext::TemplateParameterHash hashedParams(parametersAsHash());
DynamicContext::TemplateParameterHash sewnTogether(hashedParams);
const DynamicContext::TemplateParameterHash::iterator end(sewnTogether.end());
for(DynamicContext::TemplateParameterHash::iterator it(sewnTogether.begin());
it != end;
++it)
{
Expression::Ptr ¶m = it.value();
WithParam::Ptr &withParam = withParams[it.key()];
if(withParam)
param = Expression::Ptr(new DynamicContextStore(withParam->sourceExpression(), context));
else if(!param)
{
/* Ops, no xsl:with-param and no default value to cover up for it.
*/
context->error(QtXmlPatterns::tr("The parameter %1 is required, but no corresponding %2 is supplied.")
.arg(formatKeyword(context->namePool(), it.key()),
formatKeyword(QLatin1String("xsl:with-param"))),
ReportContext::XTSE0690,
this);
}
}
if(isCallTemplate)
{
/* Find xsl:with-param that has no corresponding xsl:param. */
/* Optimization: candidate for threading? */
const WithParam::Hash::const_iterator end(withParams.constEnd());
for(WithParam::Hash::const_iterator it(withParams.constBegin()); it != end; ++it)
{
if(!hashedParams.contains(it.key()))
raiseXTSE0680(context, it.key(), this);
}
}
newStack->templateParameterStore() = sewnTogether;
return newStack;
}
void Template::compileParameters(const StaticContext::Ptr &context)
{
Q_ASSERT(context);
const int len = templateParameters.count();
for(int i = 0; i < len; ++i)
{
const VariableDeclaration::Ptr &at = templateParameters.at(i);
/* If our value is required, we don't have a default value. */
if(at->expression())
{
// TODO why do we pass in its own type here?
at->setExpression(at->expression()->typeCheck(context, at->expression()->staticType()));
at->setExpression(at->expression()->compress(context));
}
}
}
Expression::Properties Template::properties() const
{
return Expression::DisableElimination; /* We're having issues with recursion detection, so this path currently loops infintely. */
Expression::Properties collect(body->properties());
VariableDeclaration::List::const_iterator end(templateParameters.constEnd());
for(VariableDeclaration::List::const_iterator it(templateParameters.constBegin());
it != end;
++it)
{
if((*it)->expression())
collect |= (*it)->expression()->properties();
}
// TODO simplify.
return collect & (Expression::RequiresFocus | Expression::IsEvaluated | Expression::DisableElimination);
}
Expression::Properties Template::dependencies() const
{
return Expression::DisableElimination; /* We're having issues with recursion detection, so this path currently loops infintely. */
Expression::Properties collect(body->dependencies());
VariableDeclaration::List::const_iterator end(templateParameters.constEnd());
for(VariableDeclaration::List::const_iterator it(templateParameters.constBegin());
it != end;
++it)
{
if((*it)->expression())
collect |= (*it)->expression()->dependencies();
}
return collect & (Expression::RequiresFocus | Expression::IsEvaluated | Expression::DisableElimination);
}
QT_END_NAMESPACE
|
