[FEATURE] add a char() function to the expression engine (#3137)

qgis · May 29, 2016 · 36ff0ba333ef13cdc8eeed37e16d5b4bcbff2812 · 36ff0ba
1 parent 78bcd4b
commit 36ff0ba333ef13cdc8eeed37e16d5b4bcbff2812
Unified Split

Showing with 8 additions and 0 deletions.

+7 −0 src/core/qgsexpression.cpp

+1 −0 tests/src/core/testqgsexpression.cpp
diff --git a/src/core/qgsexpression.cpp b/src/core/qgsexpression.cpp
@@ -1077,6 +1077,12 @@ static QVariant fcnSoundex( const QVariantList& values, const QgsExpressionConte
   return QVariant( QgsStringUtils::soundex( string ) );
 }
 
+static QVariant fcnChar( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
+{
+  QChar character = QChar( getIntValue( values.at( 0 ), parent ) );
+  return QVariant( QString( character ) );
+}
+
 static QVariant fcnWordwrap( const QVariantList& values, const QgsExpressionContext*, QgsExpression* parent )
 {
   if ( values.length() == 2 || values.length() == 3 )
@@ -3281,6 +3287,7 @@ const QList<QgsExpression::Function*>& QgsExpression::Functions()
     << new StaticFunction( "longest_common_substring", 2, fcnLCS, "Fuzzy Matching" )
     << new StaticFunction( "hamming_distance", 2, fcnHamming, "Fuzzy Matching" )
     << new StaticFunction( "soundex", 1, fcnSoundex, "Fuzzy Matching" )
+    << new StaticFunction( "char", 1, fcnChar, "String" )
     << new StaticFunction( "wordwrap", ParameterList() << Parameter( "text" ) << Parameter( "length" ) << Parameter( "delimiter", true, " " ), fcnWordwrap, "String" )
     << new StaticFunction( "length", 1, fcnLength, "String" )
     << new StaticFunction( "replace", 3, fcnReplace, "String" )

diff --git a/tests/src/core/testqgsexpression.cpp b/tests/src/core/testqgsexpression.cpp
@@ -754,6 +754,7 @@ class TestQgsExpression: public QObject
       QTest::newRow( "title" ) << "title(' HeLlO   WORLD ')" << false << QVariant( " Hello   World " );
       QTest::newRow( "trim" ) << "trim('   Test String ')" << false << QVariant( "Test String" );
       QTest::newRow( "trim empty string" ) << "trim('')" << false << QVariant( "" );
+      QTest::newRow( "char" ) << "char(81)" << false << QVariant( "Q" );
       QTest::newRow( "wordwrap" ) << "wordwrap('university of qgis',13)" << false << QVariant( "university of\nqgis" );
       QTest::newRow( "wordwrap" ) << "wordwrap('university of qgis',13,' ')" << false << QVariant( "university of\nqgis" );
       QTest::newRow( "wordwrap" ) << "wordwrap('university of qgis',-3)" << false << QVariant( "university\nof qgis" );