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qgsexpression.cpp
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qgsexpression.cpp
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/***************************************************************************
qgsexpression.cpp
-------------------
begin : August 2011
copyright : (C) 2011 Martin Dobias
email : wonder.sk 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 "qgsexpression.h"
#include <QtDebug>
#include <QDomDocument>
#include <QSettings>
#include <QDate>
#include <QRegExp>
#include <QColor>
#include <QUuid>
#include <math.h>
#include <limits>
#include "qgsdistancearea.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmaplayerregistry.h"
#include "qgsogcutils.h"
#include "qgsvectorlayer.h"
#include "qgssymbollayerv2utils.h"
#include "qgsvectorcolorrampv2.h"
#include "qgsstylev2.h"
// from parser
extern QgsExpression::Node* parseExpression( const QString& str, QString& parserErrorMsg );
QgsExpression::Interval::~Interval() {}
QgsExpression::Interval QgsExpression::Interval::invalidInterVal()
{
QgsExpression::Interval inter = QgsExpression::Interval();
inter.setValid( false );
return inter;
}
QgsExpression::Interval QgsExpression::Interval::fromString( QString string )
{
int seconds = 0;
QRegExp rx( "([-+]?\\d?\\.?\\d+\\s+\\S+)", Qt::CaseInsensitive );
QStringList list;
int pos = 0;
while (( pos = rx.indexIn( string, pos ) ) != -1 )
{
list << rx.cap( 1 );
pos += rx.matchedLength();
}
QMap<int, QStringList> map;
map.insert( 1, QStringList() << "second" << "seconds" << QObject::tr( "second|seconds", "list of words separated by | which reference years" ).split( "|" ) );
map.insert( 0 + MINUTE, QStringList() << "minute" << "minutes" << QObject::tr( "minute|minutes", "list of words separated by | which reference minutes" ).split( "|" ) );
map.insert( 0 + HOUR, QStringList() << "hour" << "hours" << QObject::tr( "hour|hours", "list of words separated by | which reference minutes hours" ).split( "|" ) );
map.insert( 0 + DAY, QStringList() << "day" << "days" << QObject::tr( "day|days", "list of words separated by | which reference days" ).split( "|" ) );
map.insert( 0 + WEEKS, QStringList() << "week" << "weeks" << QObject::tr( "week|weeks", "wordlist separated by | which reference weeks" ).split( "|" ) );
map.insert( 0 + MONTHS, QStringList() << "month" << "months" << QObject::tr( "month|months", "list of words separated by | which reference months" ).split( "|" ) );
map.insert( 0 + YEARS, QStringList() << "year" << "years" << QObject::tr( "year|years", "list of words separated by | which reference years" ).split( "|" ) );
foreach ( QString match, list )
{
QStringList split = match.split( QRegExp( "\\s+" ) );
bool ok;
double value = split.at( 0 ).toDouble( &ok );
if ( !ok )
{
continue;
}
bool matched = false;
foreach ( int duration, map.keys() )
{
foreach ( QString name, map[duration] )
{
if ( match.contains( name, Qt::CaseInsensitive ) )
{
matched = true;
break;
}
}
if ( matched )
{
seconds += value * duration;
break;
}
}
}
// If we can't parse the string at all then we just return invalid
if ( seconds == 0 )
return QgsExpression::Interval::invalidInterVal();
return QgsExpression::Interval( seconds );
}
bool QgsExpression::Interval::operator==( const QgsExpression::Interval& other ) const
{
return ( mSeconds == other.mSeconds );
}
///////////////////////////////////////////////
// three-value logic
enum TVL
{
False,
True,
Unknown
};
static TVL AND[3][3] =
{
// false true unknown
{ False, False, False }, // false
{ False, True, Unknown }, // true
{ False, Unknown, Unknown } // unknown
};
static TVL OR[3][3] =
{
{ False, True, Unknown }, // false
{ True, True, True }, // true
{ Unknown, True, Unknown } // unknown
};
static TVL NOT[3] = { True, False, Unknown };
static QVariant tvl2variant( TVL v )
{
switch ( v )
{
case False: return 0;
case True: return 1;
case Unknown:
default:
return QVariant();
}
}
#define TVL_True QVariant(1)
#define TVL_False QVariant(0)
#define TVL_Unknown QVariant()
///////////////////////////////////////////////
// QVariant checks and conversions
inline bool isIntSafe( const QVariant& v )
{
if ( v.type() == QVariant::Int ) return true;
if ( v.type() == QVariant::Double ) return false;
if ( v.type() == QVariant::String ) { bool ok; v.toString().toInt( &ok ); return ok; }
return false;
}
inline bool isDoubleSafe( const QVariant& v )
{
if ( v.type() == QVariant::Double || v.type() == QVariant::Int ) return true;
if ( v.type() == QVariant::String ) { bool ok; v.toString().toDouble( &ok ); return ok; }
return false;
}
inline bool isDateTimeSafe( const QVariant& v )
{
return v.type() == QVariant::DateTime || v.type() == QVariant::Date ||
v.type() == QVariant::Time;
}
inline bool isIntervalSafe( const QVariant& v )
{
if ( v.canConvert<QgsExpression::Interval>() )
{
return true;
}
if ( v.type() == QVariant::String )
{
return QgsExpression::Interval::fromString( v.toString() ).isValid();
}
return false;
}
inline bool isNull( const QVariant& v ) { return v.isNull(); }
///////////////////////////////////////////////
// evaluation error macros
#define ENSURE_NO_EVAL_ERROR { if (parent->hasEvalError()) return QVariant(); }
#define SET_EVAL_ERROR(x) { parent->setEvalErrorString(x); return QVariant(); }
///////////////////////////////////////////////
// operators
const char* QgsExpression::BinaryOperatorText[] =
{
"OR", "AND",
"=", "<>", "<=", ">=", "<", ">", "~", "LIKE", "NOT LIKE", "ILIKE", "NOT ILIKE", "IS", "IS NOT",
"+", "-", "*", "/", "%", "^",
"||"
};
const char* QgsExpression::UnaryOperatorText[] =
{
"NOT", "-"
};
///////////////////////////////////////////////
// functions
// implicit conversion to string
static QString getStringValue( const QVariant& value, QgsExpression* )
{
return value.toString();
}
static double getDoubleValue( const QVariant& value, QgsExpression* parent )
{
bool ok;
double x = value.toDouble( &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to double" ).arg( value.toString() ) );
return 0;
}
return x;
}
static int getIntValue( const QVariant& value, QgsExpression* parent )
{
bool ok;
qint64 x = value.toLongLong( &ok );
if ( ok && x >= std::numeric_limits<int>::min() && x <= std::numeric_limits<int>::max() )
{
return x;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to int" ).arg( value.toString() ) );
return 0;
}
}
static QDateTime getDateTimeValue( const QVariant& value, QgsExpression* parent )
{
QDateTime d = value.toDateTime();
if ( d.isValid() )
{
return d;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to DateTime" ).arg( value.toString() ) );
return QDateTime();
}
}
static QDate getDateValue( const QVariant& value, QgsExpression* parent )
{
QDate d = value.toDate();
if ( d.isValid() )
{
return d;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Date" ).arg( value.toString() ) );
return QDate();
}
}
static QTime getTimeValue( const QVariant& value, QgsExpression* parent )
{
QTime t = value.toTime();
if ( t.isValid() )
{
return t;
}
else
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Time" ).arg( value.toString() ) );
return QTime();
}
}
static QgsExpression::Interval getInterval( const QVariant& value, QgsExpression* parent, bool report_error = false )
{
if ( value.canConvert<QgsExpression::Interval>() )
return value.value<QgsExpression::Interval>();
QgsExpression::Interval inter = QgsExpression::Interval::fromString( value.toString() );
if ( inter.isValid() )
{
return inter;
}
// If we get here then we can't convert so we just error and return invalid.
if ( report_error )
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to Interval" ).arg( value.toString() ) );
return QgsExpression::Interval::invalidInterVal();
}
static QgsGeometry getGeometry( const QVariant& value, QgsExpression* parent )
{
if ( value.canConvert<QgsGeometry>() )
return value.value<QgsGeometry>();
parent->setEvalErrorString( "Cannot convert to QgsGeometry" );
return QgsGeometry();
}
static QgsFeature getFeature( const QVariant& value, QgsExpression* parent )
{
if ( value.canConvert<QgsFeature>() )
return value.value<QgsFeature>();
parent->setEvalErrorString( "Cannot convert to QgsFeature" );
return 0;
}
// this handles also NULL values
static TVL getTVLValue( const QVariant& value, QgsExpression* parent )
{
// we need to convert to TVL
if ( value.isNull() )
return Unknown;
if ( value.type() == QVariant::Int )
return value.toInt() != 0 ? True : False;
bool ok;
double x = value.toDouble( &ok );
if ( !ok )
{
parent->setEvalErrorString( QObject::tr( "Cannot convert '%1' to boolean" ).arg( value.toString() ) );
return Unknown;
}
return x != 0 ? True : False;
}
//////
static QVariant fcnSqrt( const QVariantList& values, const QgsFeature* /*f*/, QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( sqrt( x ) );
}
static QVariant fcnAbs( const QVariantList& values, const QgsFeature*, QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
return QVariant( fabs( val ) );
}
static QVariant fcnSin( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( sin( x ) );
}
static QVariant fcnCos( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( cos( x ) );
}
static QVariant fcnTan( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( tan( x ) );
}
static QVariant fcnAsin( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( asin( x ) );
}
static QVariant fcnAcos( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( acos( x ) );
}
static QVariant fcnAtan( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( atan( x ) );
}
static QVariant fcnAtan2( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double y = getDoubleValue( values.at( 0 ), parent );
double x = getDoubleValue( values.at( 1 ), parent );
return QVariant( atan2( y, x ) );
}
static QVariant fcnExp( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( exp( x ) );
}
static QVariant fcnLn( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
if ( x <= 0 )
return QVariant();
return QVariant( log( x ) );
}
static QVariant fcnLog10( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
if ( x <= 0 )
return QVariant();
return QVariant( log10( x ) );
}
static QVariant fcnLog( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double b = getDoubleValue( values.at( 0 ), parent );
double x = getDoubleValue( values.at( 1 ), parent );
if ( x <= 0 || b <= 0 )
return QVariant();
return QVariant( log( x ) / log( b ) );
}
static QVariant fcnRndF( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double min = getDoubleValue( values.at( 0 ), parent );
double max = getDoubleValue( values.at( 1 ), parent );
if ( max < min )
return QVariant();
// Return a random double in the range [min, max] (inclusive)
double f = ( double )rand() / RAND_MAX;
return QVariant( min + f * ( max - min ) ) ;
}
static QVariant fcnRnd( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
int min = getIntValue( values.at( 0 ), parent );
int max = getIntValue( values.at( 1 ), parent );
if ( max < min )
return QVariant();
// Return a random integer in the range [min, max] (inclusive)
return QVariant( min + ( rand() % ( int )( max - min + 1 ) ) );
}
static QVariant fcnLinearScale( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
double domainMin = getDoubleValue( values.at( 1 ), parent );
double domainMax = getDoubleValue( values.at( 2 ), parent );
double rangeMin = getDoubleValue( values.at( 3 ), parent );
double rangeMax = getDoubleValue( values.at( 4 ), parent );
if ( domainMin >= domainMax )
{
parent->setEvalErrorString( QObject::tr( "Domain max must be greater than domain min" ) );
return QVariant();
}
// outside of domain?
if ( val >= domainMax )
{
return rangeMax;
}
else if ( val <= domainMin )
{
return rangeMin;
}
// calculate linear scale
double m = ( rangeMax - rangeMin ) / ( domainMax - domainMin );
double c = rangeMin - ( domainMin * m );
// Return linearly scaled value
return QVariant( m * val + c );
}
static QVariant fcnExpScale( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double val = getDoubleValue( values.at( 0 ), parent );
double domainMin = getDoubleValue( values.at( 1 ), parent );
double domainMax = getDoubleValue( values.at( 2 ), parent );
double rangeMin = getDoubleValue( values.at( 3 ), parent );
double rangeMax = getDoubleValue( values.at( 4 ), parent );
double exponent = getDoubleValue( values.at( 5 ), parent );
if ( domainMin >= domainMax )
{
parent->setEvalErrorString( QObject::tr( "Domain max must be greater than domain min" ) );
return QVariant();
}
if ( exponent <= 0 )
{
parent->setEvalErrorString( QObject::tr( "Exponent must be greater than 0" ) );
return QVariant();
}
// outside of domain?
if ( val >= domainMax )
{
return rangeMax;
}
else if ( val <= domainMin )
{
return rangeMin;
}
// Return exponentially scaled value
return QVariant((( rangeMax - rangeMin ) / pow( domainMax - domainMin, exponent ) ) * pow( val - domainMin, exponent ) + rangeMin );
}
static QVariant fcnMax( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
//initially set max as first value
double maxVal = getDoubleValue( values.at( 0 ), parent );
//check against all other values
for ( int i = 1; i < values.length(); ++i )
{
double testVal = getDoubleValue( values[i], parent );
if ( testVal > maxVal )
{
maxVal = testVal;
}
}
return QVariant( maxVal );
}
static QVariant fcnMin( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
//initially set min as first value
double minVal = getDoubleValue( values.at( 0 ), parent );
//check against all other values
for ( int i = 1; i < values.length(); ++i )
{
double testVal = getDoubleValue( values[i], parent );
if ( testVal < minVal )
{
minVal = testVal;
}
}
return QVariant( minVal );
}
static QVariant fcnClamp( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double minValue = getDoubleValue( values.at( 0 ), parent );
double testValue = getDoubleValue( values.at( 1 ), parent );
double maxValue = getDoubleValue( values.at( 2 ), parent );
// force testValue to sit inside the range specified by the min and max value
if ( testValue <= minValue )
{
return QVariant( minValue );
}
else if ( testValue >= maxValue )
{
return QVariant( maxValue );
}
else
{
return QVariant( testValue );
}
}
static QVariant fcnFloor( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( floor( x ) );
}
static QVariant fcnCeil( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
double x = getDoubleValue( values.at( 0 ), parent );
return QVariant( ceil( x ) );
}
static QVariant fcnToInt( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
return QVariant( getIntValue( values.at( 0 ), parent ) );
}
static QVariant fcnToReal( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
return QVariant( getDoubleValue( values.at( 0 ), parent ) );
}
static QVariant fcnToString( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
return QVariant( getStringValue( values.at( 0 ), parent ) );
}
static QVariant fcnToDateTime( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
return QVariant( getDateTimeValue( values.at( 0 ), parent ) );
}
static QVariant fcnCoalesce( const QVariantList& values, const QgsFeature* , QgsExpression* )
{
foreach ( const QVariant &value, values )
{
if ( value.isNull() )
continue;
return value;
}
return QVariant();
}
static QVariant fcnLower( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
return QVariant( str.toLower() );
}
static QVariant fcnUpper( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
return QVariant( str.toUpper() );
}
static QVariant fcnTitle( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
QStringList elems = str.split( " " );
for ( int i = 0; i < elems.size(); i++ )
{
if ( elems[i].size() > 1 )
elems[i] = elems[i].left( 1 ).toUpper() + elems[i].mid( 1 ).toLower();
}
return QVariant( elems.join( " " ) );
}
static QVariant fcnTrim( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
return QVariant( str.trimmed() );
}
static QVariant fcnWordwrap( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
if ( values.length() == 2 || values.length() == 3 )
{
QString str = getStringValue( values.at( 0 ), parent );
int wrap = getIntValue( values.at( 1 ), parent );
if ( !str.isEmpty() && wrap != 0 )
{
QString newstr;
QString delimiterstr;
if ( values.length() == 3 ) delimiterstr = getStringValue( values.at( 2 ), parent );
if ( delimiterstr.isEmpty() ) delimiterstr = " ";
int delimiterlength = delimiterstr.length();
QStringList lines = str.split( "\n" );
int strlength, strcurrent, strhit, lasthit;
for ( int i = 0; i < lines.size(); i++ )
{
strlength = lines[i].length();
strcurrent = 0;
strhit = 0;
lasthit = 0;
while ( strcurrent < strlength )
{
// positive wrap value = desired maximum line width to wrap
// negative wrap value = desired minimum line width before wrap
if ( wrap > 0 )
{
//first try to locate delimiter backwards
strhit = lines[i].lastIndexOf( delimiterstr, strcurrent + wrap );
if ( strhit == lasthit || strhit == -1 )
{
//if no new backward delimiter found, try to locate forward
strhit = lines[i].indexOf( delimiterstr, strcurrent + qAbs( wrap ) );
}
lasthit = strhit;
}
else
{
strhit = lines[i].indexOf( delimiterstr, strcurrent + qAbs( wrap ) );
}
if ( strhit > -1 )
{
newstr.append( lines[i].midRef( strcurrent , strhit - strcurrent ) );
newstr.append( "\n" );
strcurrent = strhit + delimiterlength;
}
else
{
newstr.append( lines[i].midRef( strcurrent ) );
strcurrent = strlength;
}
}
if ( i < lines.size() - 1 ) newstr.append( "\n" );
}
return QVariant( newstr );
}
}
return QVariant();
}
static QVariant fcnLength( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
return QVariant( str.length() );
}
static QVariant fcnReplace( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
QString before = getStringValue( values.at( 1 ), parent );
QString after = getStringValue( values.at( 2 ), parent );
return QVariant( str.replace( before, after ) );
}
static QVariant fcnRegexpReplace( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
QString regexp = getStringValue( values.at( 1 ), parent );
QString after = getStringValue( values.at( 2 ), parent );
QRegExp re( regexp );
if ( !re.isValid() )
{
parent->setEvalErrorString( QObject::tr( "Invalid regular expression '%1': %2" ).arg( regexp ).arg( re.errorString() ) );
return QVariant();
}
return QVariant( str.replace( re, after ) );
}
static QVariant fcnRegexpMatch( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
QString regexp = getStringValue( values.at( 1 ), parent );
QRegExp re( regexp );
if ( !re.isValid() )
{
parent->setEvalErrorString( QObject::tr( "Invalid regular expression '%1': %2" ).arg( regexp ).arg( re.errorString() ) );
return QVariant();
}
return QVariant( str.contains( re ) ? 1 : 0 );
}
static QVariant fcnRegexpSubstr( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
QString regexp = getStringValue( values.at( 1 ), parent );
QRegExp re( regexp );
if ( !re.isValid() )
{
parent->setEvalErrorString( QObject::tr( "Invalid regular expression '%1': %2" ).arg( regexp ).arg( re.errorString() ) );
return QVariant();
}
// extract substring
re.indexIn( str );
if ( re.captureCount() > 0 )
{
// return first capture
return QVariant( re.capturedTexts()[1] );
}
else
{
return QVariant( "" );
}
}
static QVariant fcnUuid( const QVariantList&, const QgsFeature* , QgsExpression* )
{
return QUuid::createUuid().toString();
}
static QVariant fcnSubstr( const QVariantList& values, const QgsFeature* , QgsExpression* parent )
{
QString str = getStringValue( values.at( 0 ), parent );
int from = getIntValue( values.at( 1 ), parent );
int len = getIntValue( values.at( 2 ), parent );
return QVariant( str.mid( from -1, len ) );
}
static QVariant fcnRowNumber( const QVariantList& , const QgsFeature* , QgsExpression* parent )
{
return QVariant( parent->currentRowNumber() );
}
static QVariant fcnFeatureId( const QVariantList& , const QgsFeature* f, QgsExpression* )
{
// TODO: handling of 64-bit feature ids?
return f ? QVariant(( int )f->id() ) : QVariant();
}
static QVariant fcnFeature( const QVariantList& , const QgsFeature* f, QgsExpression* )
{
return f ? QVariant::fromValue( *f ) : QVariant();
}
static QVariant fcnAttribute( const QVariantList& values, const QgsFeature*, QgsExpression* parent )
{
QgsFeature feat = getFeature( values.at( 0 ), parent );
QString attr = getStringValue( values.at( 1 ), parent );
return feat.attribute( attr );
}
static QVariant fcnConcat( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString concat;
foreach ( const QVariant &value, values )
{
concat += getStringValue( value, parent );
}
return concat;
}
static QVariant fcnStrpos( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
return string.indexOf( QRegExp( getStringValue( values.at( 1 ), parent ) ) );
}
static QVariant fcnRight( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
int pos = getIntValue( values.at( 1 ), parent );
return string.right( pos );
}
static QVariant fcnLeft( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
int pos = getIntValue( values.at( 1 ), parent );
return string.left( pos );
}
static QVariant fcnRPad( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
int length = getIntValue( values.at( 1 ), parent );
QString fill = getStringValue( values.at( 2 ), parent );
return string.leftJustified( length, fill.at( 0 ), true );
}
static QVariant fcnLPad( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
int length = getIntValue( values.at( 1 ), parent );
QString fill = getStringValue( values.at( 2 ), parent );
return string.rightJustified( length, fill.at( 0 ), true );
}
static QVariant fcnFormatString( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QString string = getStringValue( values.at( 0 ), parent );
for ( int n = 1; n < values.length(); n++ )
{
string = string.arg( getStringValue( values.at( n ), parent ) );
}
return string;
}
static QVariant fcnNow( const QVariantList&, const QgsFeature* , QgsExpression * )
{
return QVariant( QDateTime::currentDateTime() );
}
static QVariant fcnToDate( const QVariantList& values, const QgsFeature* , QgsExpression * parent )
{
return QVariant( getDateValue( values.at( 0 ), parent ) );
}
static QVariant fcnToTime( const QVariantList& values, const QgsFeature* , QgsExpression * parent )
{
return QVariant( getTimeValue( values.at( 0 ), parent ) );
}
static QVariant fcnToInterval( const QVariantList& values, const QgsFeature* , QgsExpression * parent )
{
return QVariant::fromValue( getInterval( values.at( 0 ), parent ) );
}
static QVariant fcnAge( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QDateTime d1 = getDateTimeValue( values.at( 0 ), parent );
QDateTime d2 = getDateTimeValue( values.at( 1 ), parent );
int seconds = d2.secsTo( d1 );
return QVariant::fromValue( QgsExpression::Interval( seconds ) );
}
static QVariant fcnDay( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.days() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.date().day() );
}
}
static QVariant fcnYear( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.years() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.date().year() );
}
}
static QVariant fcnMonth( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.months() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.date().month() );
}
}
static QVariant fcnWeek( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.weeks() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.date().weekNumber() );
}
}
static QVariant fcnHour( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.hours() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.time().hour() );
}
}
static QVariant fcnMinute( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.minutes() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.time().minute() );
}
}
static QVariant fcnSeconds( const QVariantList& values, const QgsFeature* , QgsExpression *parent )
{
QVariant value = values.at( 0 );
QgsExpression::Interval inter = getInterval( value, parent, false );
if ( inter.isValid() )
{
return QVariant( inter.seconds() );
}
else
{
QDateTime d1 = getDateTimeValue( value, parent );
return QVariant( d1.time().second() );
}
}