//
// Automated Testing Framework (atf)
//
// Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
// CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
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// IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

#if !defined(_ATF_CXX_EXPAND_HPP_)
#define _ATF_CXX_EXPAND_HPP_

#include <stdexcept>
#include <string>
#include <vector>

#include <atf-c++/utils.hpp>

namespace atf {
namespace expand {

// ------------------------------------------------------------------------
// The "pattern_error" class.
// ------------------------------------------------------------------------

//!
//! \brief An error class to hold information about bad patterns.
//!
//! The pattern_error class is used to represent an error when parsing
//! or comparing a pattern against a string.
//!
class pattern_error : public std::runtime_error {
    struct shared_data {
        //!
        //! \brief Number of live references to this shared_data.
        //!
        size_t m_refs;

        //!
        //! \brief A pointer to the error message.
        //!
        //! This variable holds a pointer to the error message describing
        //! why the pattern failed.  This is a pointer to dynamic memory
        //! allocated by the code that constructed this class.
        //!
        char *m_what;
    };
    mutable shared_data* m_sd;

    //!
    //! \brief Assignment operator for pattern_error.
    //!
    //! This assignment operator is made private to prevent its usage.
    //! We cannot modify the parent's message once constructed, so we
    //! cannot safely implement this method.
    //!
    pattern_error& operator=(const pattern_error&);

public:
    //!
    //! \brief Constructs a new pattern_error.
    //!
    //! Constructs a new pattern error, to be thrown as an exception,
    //! with the given error message.  The error message must be a
    //! pointer to dynamically allocated memory, obtained by using the
    //! 'new char[...]' construction.
    //!
    pattern_error(atf::utils::auto_array< char >&);

    //!
    //! \brief Copy-constructor for pattern_error.
    //!
    pattern_error(const pattern_error&);

    //!
    //! \brief Destroys the pattern_error.
    //!
    //! Destroys the object and releases the memory that was held by the
    //! error message given during construction.
    //!
    ~pattern_error(void) throw();
};

// ------------------------------------------------------------------------
// Free functions.
// ------------------------------------------------------------------------

//!
//! \brief Expands a glob pattern among multiple candidates.
//!
//! Given a glob pattern and a set of candidate strings, checks which of
//! those strings match the glob pattern and returns them.
//!
template< class T >
std::vector< std::string > expand_glob(const std::string& glob,
                                       const T& candidates)
{
    std::vector< std::string > exps;

    for (typename T::const_iterator iter = candidates.begin();
         iter != candidates.end(); iter++)
        if (matches_glob(glob, *iter))
            exps.push_back(*iter);

    return exps;
}

//!
//! \brief Checks if the given string is a glob pattern.
//!
//! Returns true if the given string is a glob pattern; i.e. if it contains
//! any character that will be expanded by expand_glob.
//!
bool is_glob(const std::string&);

//!
//! \brief Checks if a given string matches a glob pattern.
//!
//! Given a glob pattern and a string, checks whether the former matches
//! the latter.  Returns a boolean indicating this condition.
//!
bool matches_glob(const std::string&, const std::string&);

} // namespace expand
} // namespace atf

#endif // !defined(_ATF_CXX_EXPAND_HPP_)