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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.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qdynamiccontextstore_p.h"
#include "qevaluationcache_p.h"
#include "quserfunctioncallsite_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
UserFunctionCallsite::UserFunctionCallsite(const QXmlName nameP,
const FunctionSignature::Arity ar) : CallSite(nameP)
, m_arity(ar)
, m_expressionSlotOffset(-2)
{
}
Item::Iterator::Ptr UserFunctionCallsite::evaluateSequence(const DynamicContext::Ptr &context) const
{
return m_body->evaluateSequence(bindVariables(context));
}
Item UserFunctionCallsite::evaluateSingleton(const DynamicContext::Ptr &context) const
{
return m_body->evaluateSingleton(bindVariables(context));
}
bool UserFunctionCallsite::evaluateEBV(const DynamicContext::Ptr &context) const
{
return m_body->evaluateEBV(bindVariables(context));
}
void UserFunctionCallsite::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
{
m_body->evaluateToSequenceReceiver(bindVariables(context));
}
DynamicContext::Ptr UserFunctionCallsite::bindVariables(const DynamicContext::Ptr &context) const
{
const DynamicContext::Ptr stackContext(context->createStack());
Q_ASSERT(stackContext);
const Expression::List::const_iterator end(m_operands.constEnd());
Expression::List::const_iterator it(m_operands.constBegin());
VariableSlotID slot = m_expressionSlotOffset;
for(; it != end; ++it)
{
stackContext->setExpressionVariable(slot,
Expression::Ptr(new DynamicContextStore(*it, context)));
++slot;
}
return stackContext;
}
SequenceType::List UserFunctionCallsite::expectedOperandTypes() const
{
SequenceType::List result;
if(m_functionDeclaration)
{
const FunctionArgument::List args(m_functionDeclaration->signature()->arguments());
const FunctionArgument::List::const_iterator end(args.constEnd());
FunctionArgument::List::const_iterator it(args.constBegin());
for(; it != end; ++it)
result.append((*it)->type());
}
else
result.append(CommonSequenceTypes::ZeroOrMoreItems);
return result;
}
Expression::Ptr UserFunctionCallsite::typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType)
{
/* The parser calls TypeChecker::applyFunctionConversion() on user function
* bodies, possibly indirectly, before all function call sites have been
* resolved. Hence it's possible that we're called before before the usual
* typeCheck() pass, and hence before we have been resolved/checked and
* subsequently m_functionDeclaration set. Therefore, encounter for that below.
*
* UnresolvedVariableReference::typeCheck() has the same dilemma.
*/
/* Ensure that the return value of the function is properly
* converted/does match from where it is called(which is here). */
if(isRecursive() || !m_functionDeclaration)
return CallSite::typeCheck(context, reqType);
else
{
/* Update, such that we use a recent version of the body that has typeCheck()
* and compress() rewrites included. */
m_body = m_functionDeclaration->body();
/* Note, we can't assign to m_functionDeclaration->body() because UserFunction can apply
* to several different callsites. Hence we need our own version. */
m_body = m_body->typeCheck(context, reqType);
/* We just act as a pipe for m_body, so we don't have to typecheck ourselves. However,
* the arguments must match the function declaration. */
typeCheckOperands(context);
return Expression::Ptr(this);
}
}
Expression::Ptr UserFunctionCallsite::compress(const StaticContext::Ptr &context)
{
if(!isRecursive())
rewrite(m_body, m_body->compress(context), context);
return CallSite::compress(context);
}
Expression::Properties UserFunctionCallsite::properties() const
{
return DisableElimination;
}
SequenceType::Ptr UserFunctionCallsite::staticType() const
{
/* Our return type, is the static type of the function body. We could have also used
* m_functionDeclaration->signature()->returnType(), but it doesn't get updated
* when function conversion is applied.
* We can't use m_body's type if we're recursive, because m_body computes its type
* from its children, and we're at least one of the children. Hence, we would
* recurse infinitely if we did.
*
* m_body can be null here if we're called before setSource().
*/
if(isRecursive() || !m_body)
return CommonSequenceTypes::ZeroOrMoreItems; // TODO use the declaration, it can have a type explicitly.
else
return m_body->staticType();
}
ExpressionVisitorResult::Ptr UserFunctionCallsite::accept(const ExpressionVisitor::Ptr &visitor) const
{
return visitor->visit(this);
}
Expression::ID UserFunctionCallsite::id() const
{
return IDUserFunctionCallsite;
}
bool UserFunctionCallsite::isSignatureValid(const FunctionSignature::Ptr &sign) const
{
Q_ASSERT(sign);
return sign->name() == name()
&&
sign->isArityValid(m_arity);
}
bool UserFunctionCallsite::configureRecursion(const CallTargetDescription::Ptr &sign)
{
Q_ASSERT(sign);
setIsRecursive(isSignatureValid(sign));
return isRecursive();
}
void UserFunctionCallsite::setSource(const UserFunction::Ptr &userFunction,
const VariableSlotID cacheSlotOffset)
{
m_functionDeclaration = userFunction;
m_body = userFunction->body();
m_expressionSlotOffset = userFunction->expressionSlotOffset();
const int len = m_operands.size();
const VariableDeclaration::List varDecls(userFunction->argumentDeclarations());
for(int i = 0; i < len; ++i)
{
/* We don't want evaluation caches for range variables, it's not necessary since
* the item is already cached in DynamicContext::rangeVariable(). */
if(m_operands.at(i)->is(IDRangeVariableReference))
continue;
/* Note that we pass in cacheSlotOffset + i here instead of varDecls.at(i)->slot since
* we want independent caches for each callsite. */
m_operands[i] = Expression::Ptr(new EvaluationCache<false>(m_operands.at(i),
varDecls.at(i),
cacheSlotOffset + i));
}
}
FunctionSignature::Arity UserFunctionCallsite::arity() const
{
return m_arity;
}
CallTargetDescription::Ptr UserFunctionCallsite::callTargetDescription() const
{
return m_functionDeclaration->signature();
}
QT_END_NAMESPACE
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