string_helpers.hpp

/*
   Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

/*
 * string_helpers.hpp
 *
 */

#ifndef string_helpers_hpp
#define string_helpers_hpp

//#include <cstdio>
#include <iostream>
#include <sstream>
#include <string>
#include <set>

namespace utils {
    
//using namespace std;
//using std::cout;
//using std::endl;
//using std::flush;
using std::string;
using std::wstring;
using std::ostream;
using std::wistringstream;
using std::set;

/************************************************************
 * String Helper Functions
 ************************************************************/

inline bool
toBool(const wstring& ws, bool vdefault)
{
    // can't get manipulators to compile
    //bool r;
    //wistringstream(ws) >> ios_base::boolalpha >> r;
    //wistringstream(ws) >> setiosflags(ios_base::boolalpha) >> r;
    // but even if compiling, this seems to return true for empty strings:
    //wistringstream wss(ws);
    //wss.flags(ios_base::boolalpha);
    //wss >> r;

    // this works but isn't worth the overhead:
    //#include <cctype>
    //wstring t;
    //std::transform(ws.begin(), ws.end(), t.begin(),
    //               static_cast< int (*)(int) >(std::tolower));

    bool val;
    if (ws.length() == 0) {
        val = vdefault;
    } else {
        // short & simple
        val = ((ws.length() == 4)
               && (ws[0] == L'T' || ws[0] == L't')
               && (ws[1] == L'R' || ws[1] == L'r')
               && (ws[2] == L'U' || ws[2] == L'u')
               && (ws[3] == L'E' || ws[3] == L'e'));
    }
    return val;
}

template< typename I >
inline I
toI(const wstring& ws, I vdefault, I verror)
{
    I val;
    if (ws.length() == 0) {
        val = vdefault;
    } else {
        wistringstream wiss(ws);
        wiss >> val;
        if (wiss.fail() || !wiss.eof()) {
            val = verror;
        }
    }
    return val;
}

inline int
toInt(const wstring& ws, int vdefault, int verror)
{
    return toI< int >(ws, vdefault, verror);
}

inline string
toString(int i)
{
    // JNI crashes with gcc & operator<<(ostream &, long/int)
    //std::ostringstream o;
    //o << i;
    //return o.str();
    char s[256];
    snprintf(s, 256, "%d", i);
    return string(s);
}

inline string
toString(const wstring& ws) 
{
    //sprintf(charptr,"%ls",wsdtring.c_str()); 
    string s(ws.begin(), ws.end());
    return s;
}

inline string
toString(const set< string >& s)
{
    string r;
    r += "[";
    set< string >::iterator i = s.begin();
    if (i != s.end()) {
        r += "\"";
        r += *i;
        r += "\"";
        while (++i != s.end()) {
            r += ", \"";
            r += *i;
            r += "\"";
        }
    }
    r += "]";
    return r;
}    

} // utils

#endif // string_helpers_hpp