source: trunk/lib/Parser.cc @ 519

// $Id: Parser.cc 519 2007-12-23 20:14:50Z jari $

/*
  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson

  This file is part of svndigest, http://trac.thep.lu.se/svndigest

  svndigest 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; either version 2 of the License, or
  (at your option) any later version.

  svndigest 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., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "Parser.h"
#include "Configuration.h"
#include "utility.h"

#include <algorithm>
#include <cassert>
#include <functional>
#include <fstream>
#include <iostream>
#include <string>
#include <utility>
#include <vector>

namespace theplu{
namespace svndigest{


  Parser::Parser(std::string path)
  {
    std::ifstream is(path.c_str());
    assert(is.good());
    const std::vector<std::pair<std::string, std::string> >* codon = 
      Configuration::instance().codon(path); 
    if (codon)
      parse(is, *codon);
    else
      text_mode(is);
    is.close();
  }


  void Parser::parse(std::istream& is,
                     const std::vector<std::pair<std::string, std::string> >& 
                     codon)
  {
    // mode zero means we are currently not in a comment
    // if mode!=0 comment is closed by codon[mode-1].second -> mode=0
    // if codon[x-1].start is found and x >= mode -> mode=x 
    size_t mode = 0;
    std::string str;
    while(getline(is,str)) {
      line_type lt=empty;
      for (std::string::iterator iter=str.begin(); iter!=str.end(); ++iter){
        for (size_t i=mode; i<codon.size(); ++i) {
          if ( iter==str.begin() && codon[i].first[0] == '\n' && 
               match_begin(iter, str.end(), codon[i].first.substr(1)) ) {
            iter += codon[i].first.size()-1;
            mode = i+1;
            break;
          }
          if (match_begin(iter, str.end(), codon[i].first)) {
            iter += codon[i].first.size();
            mode = i+1;
            break;
          }
        }
        if (iter==str.end())
          break;
        assert(mode==0 || mode-1<codon.size());
        if (mode && match_begin(iter,str.end(), codon[mode-1].second)){
          iter += codon[mode-1].second.size();
          mode=0;
          if (iter==str.end())
            break;
        }
        else if (!mode && isgraph(*iter))
          lt=code;
        else if (mode && lt!=code && isalnum(*iter))
          lt=comment;
      }
      if (mode && codon[mode-1].second==std::string("\n"))
        mode=0;
      type_.push_back(lt);
    }
  }


  void Parser::text_mode(std::istream& is)
  {
    std::string str;
    while(getline(is,str)) {
      line_type lt=empty;
      for (std::string::iterator iter=str.begin(); iter!=str.end(); ++iter){
        if (lt==empty && isalnum(*iter))
          lt = comment;
      }
      type_.push_back(lt);
    }
  }


}} // end of namespace svndigest and namespace theplu