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/*
** Copyright (C) 2017 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public License
** as published by the Free Software Foundation; either version 2.1
** of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free
** Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*/
#ifndef __PARSER_HH__
#define __PARSER_HH__
#include <string>
#include <vector>
#include <memory>
#include <parser/data.hh>
#include <parser/tree.hh>
#include <parser/proc-iface.hh>
// A simple recursive-descent parser for queries. Follows the Xapian syntax,
// but better handles non-alphanum; also implements regexp
namespace Mux {
/**
* A parser warning
*
*/
struct Warning {
size_t pos; /**< pos in string */
const std::string msg; /**< warning message */
/**
* operator==
*
* @param rhs right-hand side
*
* @return true if rhs is equal to this; false otherwise
*/
bool operator==(const Warning& rhs) const {
return pos == rhs.pos && msg == rhs.msg;
}
};
/**
* operator<<
*
* @param os an output stream
* @param w a warning
*
* @return the updated output stream
*/
inline std::ostream&
operator<< (std::ostream& os, const Warning& w)
{
os << w.pos << ":" << w.msg;
return os;
}
/**
* Parse a query string
*
* @param query a query string
* @param warnings vec to receive warnings
* @param proc a Processor object
*
* @return a parse-tree
*/
using WarningVec=std::vector<Warning>;
using ProcPtr = const std::unique_ptr<ProcIface>&;
Tree parse (const std::string& query, WarningVec& warnings,
ProcPtr proc = std::make_unique<DummyProc>());
} // namespace Mux
#endif /* __PARSER_HH__ */
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