a_dxf_group.cxx

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/*
Copyright 2011 Pierre SMARS (smars@yuntech.edu.tw)
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, either version 2 of the License, or
(at your option) any later version.
 
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, see <http://www.gnu.org/licenses/>.
*/
#include "a_dxf_group.h"
#include <sstream>
#include <string.h>
std::string     a_dxf_group::eof_ = "EOF";
//---------------------------------------------------------------------------
bool a_dxf_group::read()
{
        const int buffer_size = 254;
        if (file_->eof()) throw file_error();
        char buf[buffer_size]; char c; //the size of the buffer is critical, check if problem
        file_->getline(buf,buffer_size,'\n');  //gives problems when there's an empty line
        int n = strlen(buf)-1;
        if (buf[n]=='\r') //possibly eliminate the extra CR if file was created in windows and read in *nix
                buf[n] = '\0';
        std::istringstream ss(buf);
        ss >> code_;
        if (ss.fail()) 
        {
                std::cerr << "a_dxf_group::read() invalid code line" << std::endl;
                throw file_error();    //not an integer
        }
        if (file_->eof()) throw file_error(); //file not properly finished
        file_->getline(buf,buffer_size,'\n');  //gives problems when there's an empty line
        n = strlen(buf)-1;
        if (buf[n]=='\r') //possibly eliminate the extra CR if file was created in windows and read in *nix
                buf[n] = '\0';
        if (file_->fail()) {file_->clear();} //line is empty
        data_ = std::string(buf);
        if (data_ != "")
        {
                if (data_.length() == buffer_size-1) //long data line
                {
                        while (c != '\n') 
                        {
                                data_ = data_ + c;
                                file_->get(c);
                        }
                }
                std::string::size_type ii=data_.find_first_not_of(" ");
                std::string::size_type ie=data_.find_last_not_of(" ");
                data_ = data_.substr(ii,++ie); //suppress the spacies around
        }
        if (data_ == eof_) return false;
        return true;
}
//---------------------------------------------------------------------------
void a_dxf_group::write()
{
        std::cout << code_ << std::endl;
        std::cout << data_ << std::endl;
}
//---------------------------------------------------------------------------
void a_dxf_group::putback()
{
        file_->putback('\n');
        for (int i=data_.length()-1;i>=0; i--)
                file_->putback(data_[i]);
        std::ostringstream o;
        o << code_;
        std::string code(o.str());
        file_->putback('\n');
        for (int i=code.length()-1;i>=0; i--)
                file_->putback(code[i]);
}
//---------------------------------------------------------------------------
int a_dxf_group::data_int()
{
        int result;
        std::istringstream ss(data_);
        ss >> result;
        if (ss.fail()) throw file_error();
        return result;
}
//---------------------------------------------------------------------------
double a_dxf_group::data_double()
{
        double result;
        std::istringstream ss(data_);
        ss >> result;
        if (ss.fail()) throw file_error();
        return result;
}