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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_CONNECTIVITY_SOURCE_INC_ROWFUNCTIONPARSER_HXX
+#define INCLUDED_CONNECTIVITY_SOURCE_INC_ROWFUNCTIONPARSER_HXX
+
+#include <sal/config.h>
+#include "FDatabaseMetaDataResultSet.hxx"
+#include <connectivity/dbtoolsdllapi.hxx>
+#include <memory>
+
+namespace connectivity
+{
+
+enum class ExpressionFunct
+{
+ Equation,
+ And,
+ Or
+};
+
+#define EXPRESSION_FLAG_SUMANGLE_MODE 1
+
+class OOO_DLLPUBLIC_DBTOOLS SAL_NO_VTABLE ExpressionNode
+{
+public:
+ virtual ~ExpressionNode(){}
+
+ /** Operator to calculate function value.
+
+ This method calculates the function value.
+ */
+ virtual ORowSetValueDecoratorRef evaluate(const ODatabaseMetaDataResultSet::ORow& _aRow ) const = 0;
+
+ virtual void fill(const ODatabaseMetaDataResultSet::ORow& _aRow ) const = 0;
+};
+
+/** This exception is thrown, when the arithmetic expression
+ parser failed to parse a string.
+ */
+struct OOO_DLLPUBLIC_DBTOOLS ParseError
+{
+ ParseError( const char* ) {}
+};
+
+class FunctionParser
+{
+public:
+
+ /** Parse a string
+
+ The following grammar is accepted by this method:
+ <code>
+
+ number_digit = '0'|'1'|'2'|'3'|'4'|'5'|'6'|'7'|'8'|'9'
+
+ number = number number_digit | number_digit
+
+ equal_function = '='
+ ternary_function = 'if'
+
+ string_reference = 'a-z,A-Z,0-9' ' '
+ modifier_reference = '$' '0-9' ' '
+
+ basic_expression =
+ number |
+ string_reference |
+ additive_expression equal_function additive_expression |
+ unary_function '(' number_digit ')'
+ ternary_function '(' additive_expression ',' additive_expression ',
+ ' additive_expression ')' | '(' additive_expression ')'
+
+ </code>
+
+ @param rFunction
+ The string to parse
+
+ @throws ParseError if an invalid expression is given.
+
+ @return the generated function object.
+ */
+
+ static std::shared_ptr<ExpressionNode> const & parseFunction( const OUString& _sFunction);
+
+private:
+ // disabled constructor/destructor, since this is
+ // supposed to be a singleton
+ FunctionParser() = delete;
+ FunctionParser(const FunctionParser&) = delete;
+ FunctionParser& operator=( const FunctionParser& ) = delete;
+};
+
+
+} // namespace connectivity
+
+#endif // INCLUDED_CONNECTIVITY_SOURCE_INC_ROWFUNCTIONPARSER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */