moos_string.h

// Copyright 2009-2018 Toby Schneider (http://gobysoft.org/index.wt/people/toby)
//                     GobySoft, LLC (2013-)
//                     Massachusetts Institute of Technology (2007-2014)
//                     Community contributors (see AUTHORS file)
//
//
// This file is part of the Goby Underwater Autonomy Project Libraries
// ("The Goby Libraries").
//
// The Goby Libraries are free software: you can redistribute them and/or modify
// them 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.
//
// The Goby Libraries are distributed in the hope that they 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 Goby.  If not, see <http://www.gnu.org/licenses/>.

#ifndef MOOSSTRING20110527H
#define MOOSSTRING20110527H

#include "goby/moos/moos_header.h"

#include "goby/common/time.h"
#include "goby/util/as.h"

namespace goby
{
namespace moos
{
inline std::ostream& operator<<(std::ostream& os, const CMOOSMsg& msg)
{
    os << "[[CMOOSMsg]]"
       << " Key: " << msg.GetKey() << " Type: " << (msg.IsDouble() ? "double" : "string")
       << " Value: "
       << (msg.IsDouble() ? goby::util::as<std::string>(msg.GetDouble()) : msg.GetString())
       << " Time: " << goby::util::as<boost::posix_time::ptime>(msg.GetTime())
       << " Community: " << msg.GetCommunity()
       << " Source: " << msg.m_sSrc // no getter in CMOOSMsg!!!
       << " Source Aux: " << msg.GetSourceAux();
    return os;
}

inline bool val_from_string(std::string& out, const std::string& str, const std::string& key)
{
    // str:  foo=1,bar={2,3,4,5},pig=3,cow=yes
    // two cases:
    // key:  bar
    // key:  pig

    out.erase();

    // deal with foo=bar,o=bar problem when looking for "o=" since
    // o is contained in foo

    // ok: beginning of string, end of string, comma right before start_pos
    int match = 0;
    std::string::size_type start_pos = 0;
    while (match == 0 ||
           !(start_pos == 0 || start_pos == std::string::npos || str[start_pos - 1] == ','))
    {
        // str:  foo=1,bar={2,3,4,5},pig=3,cow=yes
        //  start_pos  ^             ^
        boost::iterator_range<std::string::const_iterator> result =
            boost::ifind_nth(str, std::string(key + "="), match);
        start_pos = (result) ? result.begin() - str.begin() : std::string::npos;
        ++match;
    }

    if (start_pos != std::string::npos)
    {
        // chopped:   bar={2,3,4,5},pig=3,cow=yes
        // chopped:   pig=3,cow=yes
        std::string chopped = str.substr(start_pos);

        // chopped:  bar={2,3,4,5},pig=3,cow=yes
        // equal_pos    ^
        // chopped:  pig=3,cow=yes
        // equal_pos    ^
        std::string::size_type equal_pos = chopped.find("=");

        // check for array
        bool is_array = (equal_pos + 1 < chopped.length() && chopped[equal_pos + 1] == '{');

        if (equal_pos != std::string::npos)
        {
            // chopped_twice:  ={2,3,4,5},pig=3,cow=yes
            // chopped_twice:  =pig=3,cow=yes
            std::string chopped_twice = chopped.substr(equal_pos);

            // chopped_twice:  ={2,3,4,5},pig=3,cow=yes
            // end_pos                  ^
            // chopped_twice:  =pig=3,cow=yes
            // end_pos               ^
            std::string::size_type end_pos =
                (is_array) ? chopped_twice.find("}") : chopped_twice.find(",");

            // out:  2,3,4,5
            // out:  3
            out = (is_array) ? chopped_twice.substr(2, end_pos - 2)
                             : chopped_twice.substr(1, end_pos - 1);

            return true;
        }
    }

    return false;
}

template <typename T>
inline bool val_from_string(T& out, const std::string& str, const std::string& key)
{
    std::string s;
    if (!val_from_string(s, str, key))
        return false;

    try
    {
        out = boost::lexical_cast<T>(s);
    }
    catch (boost::bad_lexical_cast&)
    {
        return false;
    }

    return true;
}

inline bool val_from_string(bool& out, const std::string& str, const std::string& key)
{
    std::string s;
    if (!val_from_string(s, str, key))
        return false;

    out = goby::util::as<bool>(s);
    return true;
}

inline void stripblanks(std::string& s)
{
    for (std::string::iterator it = s.end() - 1; it != s.begin() - 1; --it)
    {
        if (isspace(*it))
            s.erase(it);
    }
}
} // namespace moos
} // namespace goby

#endif