src/utility/option_parser.cpp

   1 /*
   2  * Copyright (c) 2014-2016, Andrzej Rybczak <electricityispower@gmail.com>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of the copyright holder nor the names of its
  17  * contributors may be used to endorse or promote products derived from
  18  * this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  26  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <boost/regex.hpp>
  34 #include <iostream>
  35
  36 #include "utility/option_parser.h"
  37
  38 bool yes_no(const std::string &v)
  39 {
  40         if (v == "yes")
  41                 return true;
  42         else if (v == "no")
  43                 return false;
  44         else
  45                 invalid_value(v);
  46 }
  47
  48 ////////////////////////////////////////////////////////////////////////////////
  49
  50 bool option_parser::run(std::istream &is, bool ignore_errors)
  51 {
  52         // quoted value. leftmost and rightmost quotation marks are the delimiters.
  53         boost::regex quoted("(\\w+)\\h*=\\h*\"(.*)\"[^\"]*");
  54         // unquoted value. whitespaces get trimmed.
  55         boost::regex unquoted("(\\w+)\\h*=\\h*(.*?)\\h*");
  56         boost::smatch match;
  57         std::string line;
  58         while (std::getline(is, line))
  59         {
  60                 if (boost::regex_match(line, match, quoted)
  61                 ||  boost::regex_match(line, match, unquoted))
  62                 {
  63                         std::string option = match[1];
  64                         auto it = m_parsers.find(option);
  65                         if (it != m_parsers.end())
  66                         {
  67                                 try
  68                                 {
  69                                         it->second.parse(match[2]);
  70                                 }
  71                                 catch (std::exception &e)
  72                                 {
  73                                         std::cerr << "Error while processing option \"" << option
  74                                                   << "\": " << e.what() << "\n";
  75                                         if (!ignore_errors)
  76                                                 return false;
  77                                 }
  78                         }
  79                         else
  80                         {
  81                                 std::cerr << "Unknown option: " << option << "\n";
  82                                 if (!ignore_errors)
  83                                         return false;
  84                         }
  85                 }
  86         }
  87         return true;
  88 }
  89
  90 bool option_parser::initialize_undefined(bool ignore_errors)
  91 {
  92         for (auto &pp : m_parsers)
  93         {
  94                 auto &p = pp.second;
  95                 if (!p.used())
  96                 {
  97                         try
  98                         {
  99                                 p.parse_default();
 100                         }
 101                         catch (std::exception &e)
 102                         {
 103                                 std::cerr << "Error while initializing option \"" << pp.first
 104                                           << "\": " << e.what() << "\n";
 105                                 if (ignore_errors)
 106                                         return false;
 107                         }
 108                 }
 109         }
 110         return true;
 111 }