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