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ec40199862
The file qgsexpressions.h has grown to one monolithic piece over the years. This makes it hard to maintain and slows down compilation because even small changes at one end will result in recompiling big parts of the source tree. It also requires the compiler to keep track of all these implementation details for said big parts of the source tree. This splits this implementation into smaller pieces. There are soe API changes connected to this, but since these can be considered implementation details, on which not many plugins rely, this shouldn't have a big impact on the ecosystem outside the source tree.
115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
/***************************************************************************
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qgssqliteexpressioncompiler.cpp
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-----------------------------------
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begin : November 2015
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copyright : (C) 2015 Nyall Dawson
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email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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///@cond PRIVATE
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#include "qgssqliteexpressioncompiler.h"
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#include "qgssqlexpressioncompiler.h"
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#include "qgsexpressionnodeimpl.h"
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QgsSQLiteExpressionCompiler::QgsSQLiteExpressionCompiler( const QgsFields &fields )
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: QgsSqlExpressionCompiler( fields, QgsSqlExpressionCompiler::LikeIsCaseInsensitive | QgsSqlExpressionCompiler::IntegerDivisionResultsInInteger )
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{
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}
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QgsSqlExpressionCompiler::Result QgsSQLiteExpressionCompiler::compileNode( const QgsExpressionNode *node, QString &result )
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{
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switch ( node->nodeType() )
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{
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case QgsExpressionNode::ntBinaryOperator:
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{
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switch ( static_cast<const QgsExpressionNodeBinaryOperator *>( node )->op() )
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{
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case QgsExpressionNodeBinaryOperator::boPow:
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case QgsExpressionNodeBinaryOperator::boRegexp:
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return Fail; //not supported by SQLite
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default:
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//fallback to default handling
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return QgsSqlExpressionCompiler::compileNode( node, result );
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}
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}
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default:
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break;
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}
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return QgsSqlExpressionCompiler::compileNode( node, result );
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}
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QString QgsSQLiteExpressionCompiler::quotedIdentifier( const QString &identifier )
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{
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QString id( identifier );
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id.replace( '\"', QLatin1String( "\"\"" ) );
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return id.prepend( '\"' ).append( '\"' );
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}
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QString QgsSQLiteExpressionCompiler::quotedValue( const QVariant &value, bool &ok )
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{
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ok = true;
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if ( value.isNull() )
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return QStringLiteral( "NULL" );
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switch ( value.type() )
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{
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case QVariant::Int:
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case QVariant::LongLong:
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case QVariant::Double:
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return value.toString();
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case QVariant::Bool:
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//SQLite has no boolean literals
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return value.toBool() ? "1" : "0";
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default:
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case QVariant::String:
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QString v = value.toString();
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// https://www.sqlite.org/lang_expr.html :
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// """A string constant is formed by enclosing the string in single quotes (').
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// A single quote within the string can be encoded by putting two single quotes
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// in a row - as in Pascal. C-style escapes using the backslash character are not supported because they are not standard SQL. """
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return v.replace( '\'', QLatin1String( "''" ) ).prepend( '\'' ).append( '\'' );
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}
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}
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QString QgsSQLiteExpressionCompiler::sqlFunctionFromFunctionName( const QString &fnName ) const
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{
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static const QMap<QString, QString> FN_NAMES
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{
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{ "abs", "abs" },
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{ "char", "char" },
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{ "coalesce", "coalesce" },
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{ "lower", "lower" },
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{ "round", "round" },
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{ "trim", "trim" },
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{ "upper", "upper" },
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};
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return FN_NAMES.value( fnName, QString() );
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}
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QString QgsSQLiteExpressionCompiler::castToReal( const QString &value ) const
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{
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return QStringLiteral( "CAST((%1) AS REAL)" ).arg( value );
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}
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QString QgsSQLiteExpressionCompiler::castToInt( const QString &value ) const
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{
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return QStringLiteral( "CAST((%1) AS INTEGER)" ).arg( value );
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}
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///@endcond
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