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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 .
*/
#pragma once
#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
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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