src/properties.cpp

   1 /*  Copyright (C) 2006-2008  Joris Mooij  [j dot mooij at science dot ru dot nl]
   2     Radboud University Nijmegen, The Netherlands
   3
   4     This file is part of libDAI.
   5
   6     libDAI is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     libDAI is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with libDAI; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 */
  20
  21
  22 #include <iostream>
  23 #include <dai/properties.h>
  24 #include <dai/exceptions.h>
  25
  26
  27 namespace dai {
  28
  29
  30 /// Sends a single Property object to an output stream
  31 std::ostream& operator<< (std::ostream & os, const Property & p) {
  32     os << p.first << "=";
  33     if( p.second.type() == typeid(size_t) )
  34         os << boost::any_cast<size_t>(p.second);
  35     else if( p.second.type() == typeid(std::string) )
  36         os << boost::any_cast<std::string>(p.second);
  37     else if( p.second.type() == typeid(double) )
  38         os << boost::any_cast<double>(p.second);
  39     else if( p.second.type() == typeid(bool) )
  40         os << boost::any_cast<bool>(p.second);
  41     else if( p.second.type() == typeid(PropertySet) )
  42         os << boost::any_cast<PropertySet>(p.second);
  43     else
  44         DAI_THROW(UNKNOWN_PROPERTY_TYPE);
  45     return( os );
  46 }
  47
  48
  49 /// Sends a PropertySet object to an output stream
  50 std::ostream& operator<< (std::ostream & os, const PropertySet & ps) {
  51     os << "[";
  52     for( PropertySet::const_iterator p = ps.begin(); p != ps.end(); p++ ) {
  53         if( p != ps.begin() )
  54             os << ",";
  55         os << (Property)*p;
  56     }
  57     os << "]";
  58     return os;
  59 }
  60
  61
  62 /// Reads a PropertySet object from an input stream, storing values as strings
  63 std::istream& operator >> (std::istream& is, PropertySet & ps) {
  64     ps = PropertySet();
  65
  66     std::string s;
  67     is >> s;
  68
  69     // Check whether s is of the form "[.*]"
  70     if( (s.length() < 2) || (s.at(0) != '[') || (s.at(s.length()-1)) != ']' )
  71         DAI_THROW(MALFORMED_PROPERTY);
  72
  73     size_t N = s.length() - 1;
  74     for( size_t token_start = 1; token_start < N; ) {
  75         size_t token_end;
  76
  77         // scan until '=' is found
  78         for( token_end = token_start + 1; token_end < N; token_end++ )
  79             if( s[token_end] == '=' )
  80                 break;
  81         if( token_end == N )
  82             DAI_THROW(MALFORMED_PROPERTY);
  83         // we found a key
  84         std::string key = s.substr(token_start, token_end - token_start);
  85
  86         token_start = token_end + 1;
  87         // scan until matching ',' is found
  88         int level = 0;
  89         for( token_end = token_start; token_end < N; token_end++ ) {
  90             if( s[token_end] == '[' )
  91                 level++;
  92             else if( s[token_end] == ']' )
  93                 level--;
  94             else if( (s[token_end] == ',') && (level == 0) )
  95                 break;
  96         }
  97         if( !(level == 0) )
  98             DAI_THROW(MALFORMED_PROPERTY);
  99         // we found a vlue
 100         std::string value = s.substr(token_start, token_end - token_start);
 101
 102         // store the key,value pair
 103         ps.Set(key,value);
 104
 105         // go on with the next one
 106         token_start = token_end + 1;
 107     }
 108
 109     return is;
 110 }
 111
 112
 113 } // end of namespace dai