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Code dedup

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This commit is contained in:
Matthias Kuhn 2017-07-08 08:50:37 +02:00
parent 66d562a336
commit eb8eb59680
2 changed files with 39 additions and 20 deletions
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46
src/core/expression/qgsexpressionfunction.cpp
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@ -4302,20 +4302,17 @@ bool QgsWithVariableExpressionFunction::isStatic( const QgsExpressionNodeFunctio
if ( args->count() < 3 )
return false;
// We only need to check if the node evaluation is static, if both - name and value - are static.
if ( args->at( 0 )->isStatic( parent, context ) && args->at( 1 )->isStatic( parent, context ) )
{
QVariant name = args->at( 0 )->eval( parent, context );
QVariant value = args->at( 1 )->eval( parent, context );
QgsExpressionContextScope *scope = new QgsExpressionContextScope();
scope->setVariable( name.toString(), value );
QgsExpressionContext *updatedContext = const_cast<QgsExpressionContext *>( context );
updatedContext->appendScope( scope );
if ( args->at( 2 )->isStatic( parent, updatedContext ) )
// Temporarily append a new scope to provide the variable
appendTemporaryVariable( context, name.toString(), value );
if ( args->at( 2 )->isStatic( parent, context ) )
isStatic = true;
delete updatedContext->popScope();
popTemporaryVariable( context );
}
return false;
@ -4332,15 +4329,13 @@ QVariant QgsWithVariableExpressionFunction::run( QgsExpressionNode::NodeList *ar
QVariant name = args->at( 0 )->eval( parent, context );
QVariant value = args->at( 1 )->eval( parent, context );
QgsExpressionContextScope *scope = new QgsExpressionContextScope();
scope->setVariable( name.toString(), value );
QgsExpressionContext *updatedContext = const_cast<QgsExpressionContext *>( context );
if ( !context )
updatedContext = new QgsExpressionContext();
updatedContext->appendScope( scope );
appendTemporaryVariable( updatedContext, name.toString(), value );
result = args->at( 2 )->eval( parent, updatedContext );
delete updatedContext->popScope();
popTemporaryVariable( updatedContext );
if ( !context )
delete updatedContext;
@ -4369,13 +4364,24 @@ bool QgsWithVariableExpressionFunction::prepare( const QgsExpressionNodeFunction
QVariant name = args->at( 0 )->prepare( parent, context );
QVariant value = args->at( 1 )->prepare( parent, context );
QgsExpressionContextScope *scope = new QgsExpressionContextScope();
scope->setVariable( name.toString(), value );
QgsExpressionContext *updatedContext = const_cast<QgsExpressionContext *>( context );
updatedContext->appendScope( scope );
args->at( 2 )->prepare( parent, updatedContext );
delete updatedContext->popScope();
appendTemporaryVariable( context, name.toString(), value );
args->at( 2 )->prepare( parent, context );
popTemporaryVariable( context );
return true;
}
void QgsWithVariableExpressionFunction::popTemporaryVariable( const QgsExpressionContext *context ) const
{
QgsExpressionContext *updatedContext = const_cast<QgsExpressionContext *>( context );
delete updatedContext->popScope();
}
void QgsWithVariableExpressionFunction::appendTemporaryVariable( const QgsExpressionContext *context, const QString &name, const QVariant &value ) const
{
QgsExpressionContextScope *scope = new QgsExpressionContextScope();
scope->setVariable( name, value );
QgsExpressionContext *updatedContext = const_cast<QgsExpressionContext *>( context );
updatedContext->appendScope( scope );
}

13
src/core/expression/qgsexpressionfunction.h
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@ -29,6 +29,7 @@
class QgsExpressionNodeFunction;
class QgsExpression;
class QgsExpressionContext;
class QgsExpressionContextScope;
/** \ingroup core
* A abstract base class for defining QgsExpression functions.
@ -475,6 +476,18 @@ class QgsWithVariableExpressionFunction : public QgsExpressionFunction
QVariant func( const QVariantList &values, const QgsExpressionContext *context, QgsExpression *parent ) override;
bool prepare( const QgsExpressionNodeFunction *node, QgsExpression *parent, const QgsExpressionContext *context ) const override;
private:
/**
* Append a scope with a single variable definition (``name``=``value``)
*/
void appendTemporaryVariable( const QgsExpressionContext *context, const QString &name, const QVariant &value ) const;
/**
* Pop the temporary scope again
*/
void popTemporaryVariable( const QgsExpressionContext *context ) const;
};
#endif