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qgsexpressioncontext.cpp
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qgsexpressioncontext.cpp
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/***************************************************************************
qgsexpressioncontext.cpp
------------------------
Date : April 2015
Copyright : (C) 2015 by Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsexpressioncontext.h"
#include "qgslogger.h"
#include "qgsexpression.h"
#include "qgsfield.h"
#include "qgsvectorlayer.h"
#include "qgsproject.h"
#include "qgssymbollayerv2utils.h"
#include "qgsgeometry.h"
#include <QSettings>
#include <QDir>
const QString QgsExpressionContext::EXPR_FIELDS( "_fields_" );
const QString QgsExpressionContext::EXPR_FEATURE( "_feature_" );
//
// QgsExpressionContextScope
//
QgsExpressionContextScope::QgsExpressionContextScope( const QString& name )
: mName( name )
{
}
QgsExpressionContextScope::QgsExpressionContextScope( const QgsExpressionContextScope& other )
: mName( other.mName )
, mVariables( other.mVariables )
{
Q_FOREACH ( QString key, other.mFunctions.keys() )
{
mFunctions.insert( key, other.mFunctions.value( key )->clone() );
}
}
QgsExpressionContextScope& QgsExpressionContextScope::operator=( const QgsExpressionContextScope & other )
{
mName = other.mName;
mVariables = other.mVariables;
qDeleteAll( mFunctions );
mFunctions.clear();
Q_FOREACH ( QString key, other.mFunctions.keys() )
{
mFunctions.insert( key, other.mFunctions.value( key )->clone() );
}
return *this;
}
QgsExpressionContextScope::~QgsExpressionContextScope()
{
qDeleteAll( mFunctions );
}
void QgsExpressionContextScope::setVariable( const QString &name, const QVariant &value )
{
if ( mVariables.contains( name ) )
{
StaticVariable existing = mVariables.value( name );
existing.value = value;
addVariable( existing );
}
else
{
addVariable( QgsExpressionContextScope::StaticVariable( name, value ) );
}
}
void QgsExpressionContextScope::addVariable( const QgsExpressionContextScope::StaticVariable &variable )
{
mVariables.insert( variable.name, variable );
}
bool QgsExpressionContextScope::removeVariable( const QString &name )
{
return mVariables.remove( name ) > 0;
}
bool QgsExpressionContextScope::hasVariable( const QString &name ) const
{
return mVariables.contains( name );
}
QVariant QgsExpressionContextScope::variable( const QString &name ) const
{
return hasVariable( name ) ? mVariables.value( name ).value : QVariant();
}
QStringList QgsExpressionContextScope::variableNames() const
{
QStringList names = mVariables.keys();
return names;
}
bool QgsExpressionContextScope::isReadOnly( const QString &name ) const
{
return hasVariable( name ) ? mVariables.value( name ).readOnly : false;
}
bool QgsExpressionContextScope::hasFunction( const QString& name ) const
{
return mFunctions.contains( name );
}
QgsExpression::Function* QgsExpressionContextScope::function( const QString& name ) const
{
return mFunctions.contains( name ) ? mFunctions.value( name ) : 0;
}
void QgsExpressionContextScope::addFunction( const QString& name, QgsScopedExpressionFunction* function )
{
mFunctions.insert( name, function );
}
void QgsExpressionContextScope::setFeature( const QgsFeature &feature )
{
setVariable( QgsExpressionContext::EXPR_FEATURE, QVariant::fromValue( feature ) );
}
void QgsExpressionContextScope::setFields( const QgsFields &fields )
{
setVariable( QgsExpressionContext::EXPR_FIELDS, QVariant::fromValue( fields ) );
}
//
// QgsExpressionContext
//
QgsExpressionContext::QgsExpressionContext( const QgsExpressionContext& other )
{
Q_FOREACH ( const QgsExpressionContextScope* scope, other.mStack )
{
mStack << new QgsExpressionContextScope( *scope );
}
}
QgsExpressionContext& QgsExpressionContext::operator=( const QgsExpressionContext & other )
{
qDeleteAll( mStack );
mStack.clear();
Q_FOREACH ( const QgsExpressionContextScope* scope, other.mStack )
{
mStack << new QgsExpressionContextScope( *scope );
}
return *this;
}
QgsExpressionContext::~QgsExpressionContext()
{
qDeleteAll( mStack );
mStack.clear();
}
bool QgsExpressionContext::hasVariable( const QString& name ) const
{
Q_FOREACH ( const QgsExpressionContextScope* scope, mStack )
{
if ( scope->hasVariable( name ) )
return true;
}
return false;
}
QVariant QgsExpressionContext::variable( const QString& name ) const
{
const QgsExpressionContextScope* scope = activeScopeForVariable( name );
return scope ? scope->variable( name ) : QVariant();
}
const QgsExpressionContextScope* QgsExpressionContext::activeScopeForVariable( const QString& name ) const
{
//iterate through stack backwards, so that higher priority variables take precedence
QList< QgsExpressionContextScope* >::const_iterator it = mStack.constEnd();
while ( it != mStack.constBegin() )
{
--it;
if (( *it )->hasVariable( name ) )
return ( *it );
}
return 0;
}
QgsExpressionContextScope* QgsExpressionContext::activeScopeForVariable( const QString& name )
{
//iterate through stack backwards, so that higher priority variables take precedence
QList< QgsExpressionContextScope* >::iterator it = mStack.end();
while ( it != mStack.begin() )
{
--it;
if (( *it )->hasVariable( name ) )
return ( *it );
}
return 0;
}
QgsExpressionContextScope* QgsExpressionContext::scope( int index )
{
if ( index < 0 || index >= mStack.count() )
return 0;
return mStack[index];
}
QgsExpressionContextScope *QgsExpressionContext::lastScope()
{
if ( mStack.count() < 1 )
return 0;
return mStack.last();
}
int QgsExpressionContext::indexOfScope( QgsExpressionContextScope* scope ) const
{
if ( !scope )
return -1;
return mStack.indexOf( scope );
}
QStringList QgsExpressionContext::variableNames() const
{
QStringList names;
Q_FOREACH ( const QgsExpressionContextScope* scope, mStack )
{
names << scope->variableNames();
}
return names.toSet().toList();
}
bool QgsExpressionContext::isReadOnly( const QString& name ) const { Q_UNUSED( name ); return true; }
bool QgsExpressionContext::hasFunction( const QString &name ) const
{
Q_FOREACH ( const QgsExpressionContextScope* scope, mStack )
{
if ( scope->hasFunction( name ) )
return true;
}
return false;
}
QgsExpression::Function *QgsExpressionContext::function( const QString &name ) const
{
//iterate through stack backwards, so that higher priority variables take precedence
QList< QgsExpressionContextScope* >::const_iterator it = mStack.constEnd();
while ( it != mStack.constBegin() )
{
--it;
if (( *it )->hasFunction( name ) )
return ( *it )->function( name );
}
return 0;
}
int QgsExpressionContext::scopeCount() const
{
return mStack.count();
}
void QgsExpressionContext::appendScope( QgsExpressionContextScope* scope )
{
mStack.append( scope );
}
QgsExpressionContext& QgsExpressionContext::operator<<( QgsExpressionContextScope* scope )
{
mStack.append( scope );
return *this;
}
void QgsExpressionContext::setFeature( const QgsFeature &feature )
{
if ( mStack.isEmpty() )
mStack.append( new QgsExpressionContextScope() );
mStack.last()->setFeature( feature );
}
void QgsExpressionContext::setFields( const QgsFields &fields )
{
if ( mStack.isEmpty() )
mStack.append( new QgsExpressionContextScope() );
mStack.last()->setFields( fields );
}
//
// QgsExpressionContextUtils
//
QgsExpressionContextScope* QgsExpressionContextUtils::globalScope()
{
QgsExpressionContextScope* scope = new QgsExpressionContextScope( QObject::tr( "Global" ) );
//read values from QSettings
QSettings settings;
//check if settings contains any variables
if ( settings.contains( QString( "/variables/values" ) ) )
{
QList< QVariant > customVariableVariants = settings.value( QString( "/variables/values" ) ).toList();
QList< QVariant > customVariableNames = settings.value( QString( "/variables/names" ) ).toList();
int variableIndex = 0;
for ( QList< QVariant >::const_iterator it = customVariableVariants.constBegin();
it != customVariableVariants.constEnd(); ++it )
{
if ( variableIndex >= customVariableNames.length() )
{
break;
}
QVariant value = ( *it );
QString name = customVariableNames.at( variableIndex ).toString();
scope->setVariable( name, value );
variableIndex++;
}
}
//add some extra global variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( "qgis_version", QGis::QGIS_VERSION, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "qgis_version_no", QGis::QGIS_VERSION_INT, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "qgis_release_name", QGis::QGIS_RELEASE_NAME, true ) );
return scope;
}
void QgsExpressionContextUtils::setGlobalVariable( const QString& name, const QVariant& value )
{
// save variable to settings
QSettings settings;
QList< QVariant > customVariableVariants = settings.value( QString( "/variables/values" ) ).toList();
QList< QVariant > customVariableNames = settings.value( QString( "/variables/names" ) ).toList();
customVariableVariants << value;
customVariableNames << name;
settings.setValue( QString( "/variables/names" ), customVariableNames );
settings.setValue( QString( "/variables/values" ), customVariableVariants );
}
void QgsExpressionContextUtils::setGlobalVariables( const QgsStringMap &variables )
{
QSettings settings;
QList< QVariant > customVariableVariants;
QList< QVariant > customVariableNames;
Q_FOREACH ( QString variable, variables.keys() )
{
customVariableNames << variable;
customVariableVariants << variables.value( variable );
}
settings.setValue( QString( "/variables/names" ), customVariableNames );
settings.setValue( QString( "/variables/values" ), customVariableVariants );
}
class GetNamedProjectColor : public QgsScopedExpressionFunction
{
public:
GetNamedProjectColor()
: QgsScopedExpressionFunction( "project_color", 1, "Colors" )
{
//build up color list from project. Do this in advance for speed
QStringList colorStrings = QgsProject::instance()->readListEntry( "Palette", "/Colors" );
QStringList colorLabels = QgsProject::instance()->readListEntry( "Palette", "/Labels" );
//generate list from custom colors
int colorIndex = 0;
for ( QStringList::iterator it = colorStrings.begin();
it != colorStrings.end(); ++it )
{
QColor color = QgsSymbolLayerV2Utils::decodeColor( *it );
QString label;
if ( colorLabels.length() > colorIndex )
{
label = colorLabels.at( colorIndex );
}
mColors.insert( label.toLower(), color );
colorIndex++;
}
}
virtual QVariant func( const QVariantList& values, const QgsExpressionContext*, QgsExpression* ) override
{
QString colorName = values.at( 0 ).toString().toLower();
if ( mColors.contains( colorName ) )
{
return QString( "%1,%2,%3" ).arg( mColors.value( colorName ).red() ).arg( mColors.value( colorName ).green() ).arg( mColors.value( colorName ).blue() );
}
else
return QVariant();
}
QgsScopedExpressionFunction* clone() const override
{
return new GetNamedProjectColor();
}
private:
QHash< QString, QColor > mColors;
};
QgsExpressionContextScope* QgsExpressionContextUtils::projectScope()
{
QgsProject* project = QgsProject::instance();
QgsExpressionContextScope* scope = new QgsExpressionContextScope( QObject::tr( "Project" ) );
//add variables defined in project file
QStringList variableNames = project->readListEntry( "Variables", "/variableNames" );
QStringList variableValues = project->readListEntry( "Variables", "/variableValues" );
int varIndex = 0;
foreach ( QString variableName, variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
QString varValueString = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValueString );
}
//add other known project variables
scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_title", project->title(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_path", project->fileInfo().filePath(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_folder", project->fileInfo().dir().path(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "project_filename", project->fileInfo().fileName(), true ) );
scope->addFunction( "project_color", new GetNamedProjectColor() );
return scope;
}
void QgsExpressionContextUtils::setProjectVariable( const QString& name, const QVariant& value )
{
QgsProject* project = QgsProject::instance();
//write variable to project
QStringList variableNames = project->readListEntry( "Variables", "/variableNames" );
QStringList variableValues = project->readListEntry( "Variables", "/variableValues" );
variableNames << name;
variableValues << value.toString();
project->writeEntry( "Variables", "/variableNames", variableNames );
project->writeEntry( "Variables", "/variableValues", variableValues );
}
void QgsExpressionContextUtils::setProjectVariables( const QgsStringMap &variables )
{
QgsProject* project = QgsProject::instance();
//write variable to project
QStringList variableNames;
QStringList variableValues;
Q_FOREACH ( QString variable, variables.keys() )
{
variableNames << variable;
variableValues << variables.value( variable );
}
project->writeEntry( "Variables", "/variableNames", variableNames );
project->writeEntry( "Variables", "/variableValues", variableValues );
}
QgsExpressionContextScope* QgsExpressionContextUtils::layerScope( QgsMapLayer* layer )
{
QgsExpressionContextScope* scope = new QgsExpressionContextScope( QObject::tr( "Layer" ) );
if ( !layer )
return scope;
//add variables defined in layer properties
QStringList variableNames = layer->customProperty( "variableNames" ).toStringList();
QStringList variableValues = layer->customProperty( "variableValues" ).toStringList();
int varIndex = 0;
foreach ( QString variableName, variableNames )
{
if ( varIndex >= variableValues.length() )
{
break;
}
QVariant varValue = variableValues.at( varIndex );
varIndex++;
scope->setVariable( variableName, varValue );
}
//TODO - add tests for all of these:
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_name", layer->name(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_id", layer->id(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_title", layer->title(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_abstract", layer->abstract(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_keywords", layer->keywordList(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_dataurl", layer->dataUrl(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_attribution", layer->attribution(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_attributionurl", layer->attributionUrl(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_source", layer->publicSource(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_minscale", layer->minimumScale(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_maxscale", layer->maximumScale(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_crs", layer->crs().authid(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_crsdefinition", layer->crs().toProj4(), true ) );
QgsGeometry* extentGeom = QgsGeometry::fromRect( layer->extent() );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_extent", QVariant::fromValue( *extentGeom ), true ) );
delete extentGeom;
QgsVectorLayer* vLayer = dynamic_cast< QgsVectorLayer* >( layer );
if ( vLayer )
{
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_geometrytype", vLayer->type(), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_storagetype", vLayer->storageType(), true ) );
QString typeString( QGis::vectorGeometryType( vLayer->geometryType() ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_geometrytype", typeString, true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "layer_featurecount", QVariant::fromValue( vLayer->featureCount() ), true ) );
scope->addVariable( QgsExpressionContextScope::StaticVariable( "_fields_", QVariant::fromValue( vLayer->fields() ), true ) );
}
//TODO - add functions. Possibilities include:
//is_selected
//field summary stats
return scope;
}
void QgsExpressionContextUtils::setLayerVariable( QgsMapLayer* layer, const QString& name, const QVariant& value )
{
if ( !layer )
return;
//write variable to layer
QStringList variableNames = layer->customProperty( "variableNames" ).toStringList();
QStringList variableValues = layer->customProperty( "variableValues" ).toStringList();
variableNames << name;
variableValues << value.toString();
layer->setCustomProperty( "variableNames", variableNames );
layer->setCustomProperty( "variableValues", variableValues );
}
void QgsExpressionContextUtils::setLayerVariables( QgsMapLayer* layer, const QgsStringMap variables )
{
if ( !layer )
return;
QStringList variableNames;
QStringList variableValues;
Q_FOREACH ( QString variable, variables.keys() )
{
variableNames << variable;
variableValues << variables.value( variable );
}
layer->setCustomProperty( "variableNames", variableNames );
layer->setCustomProperty( "variableValues", variableValues );
}
QgsExpressionContext QgsExpressionContextUtils::createFeatureBasedContext( const QgsFeature &feature, const QgsFields &fields )
{
QgsExpressionContextScope* scope = new QgsExpressionContextScope();
scope->setVariable( QString( "_feature_" ), QVariant::fromValue( feature ) );
scope->setVariable( QString( "_fields_" ), QVariant::fromValue( fields ) );
return QgsExpressionContext() << scope;
}
void QgsExpressionContextUtils::registerContextFunctions()
{
QgsExpression::registerFunction( new GetNamedProjectColor() );
}