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parser.cpp
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parser.cpp
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/*
* CS475/CS675 - Computer Graphics
* ToyLOGO Assignment Base Code
*
* Copyright 2011, Parag Chaudhuri, Department of CSE, IIT Bombay
*
* 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 3 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 "parser.hpp"
std::string parser_t::parse_token(std::istream &_inp, turtle_com_list_t &list)
{
std::string token;
_inp>>token;
if (token == "PAUSE")
{
std::cerr << "Paused for";
turtle_slp_t* com = new turtle_slp_t;
_inp >> com->sec;
std::cerr << com->sec << std::endl;
list.push_back(com);
}
if (token == "F")
{
std::cerr<<"Forward: ";
turtle_fwd_t* com = new turtle_fwd_t;
_inp>>com->dist;
std::cerr<<com->dist<<std::endl;
list.push_back(com);
}
else if (token == "B")
{
std::cerr<<"Back: ";
turtle_bck_t* com = new turtle_bck_t;
_inp>>com->dist;
std::cerr<<com->dist<<std::endl;
list.push_back(com);
}
else if (token == "L")
{
std::cerr<<"Left: ";
turtle_lft_t* com = new turtle_lft_t;
_inp>>com->angl;
std::cerr<<com->angl<<std::endl;
list.push_back(com);
}
else if (token == "R")
{
std::cerr<<"Right: ";
turtle_rht_t* com = new turtle_rht_t;
_inp>>com->angl;
std::cerr<<com->angl<<std::endl;
list.push_back(com);
}
else if (token == "MF")
{
std::cerr<<"Move Forward: ";
turtle_mfwd_t* com = new turtle_mfwd_t;
_inp>>com->dist;
std::cerr<<com->dist<<std::endl;
list.push_back(com);
}
else if (token == "MB")
{
std::cerr<<"Move Backward: ";
turtle_mbck_t* com = new turtle_mbck_t;
_inp>>com->dist;
std::cerr<<com->dist<<std::endl;
list.push_back(com);
}
else if (token == "RESET")
{
std::cerr<<"Reset Turtle"<<std::endl;
turtle_rst_t* com = new turtle_rst_t;
list.push_back(com);
}
else if (token == "CLS")
{
std::cerr<<"Clear Screen"<<std::endl;
turtle_cls_t* com = new turtle_cls_t;
list.push_back(com);
}
else if (token == "REPEAT")
{
std::cerr<<"Repeat ";
turtle_rep_t* com = new turtle_rep_t;
_inp>>com->times;
std::cerr<<com->times<<" times"<<std::endl;
list.push_back(com);
while (token != "ENDREP")
{
token = parse_token(_inp, com->replist);
}
token="";
}
else if (token == "ENDREP")
{
std::cerr<<"End Repeat "<<std::endl;
turtle_erep_t* com = new turtle_erep_t;
list.push_back(com);
}
else if (token == "COL")
{
std::cerr<<"Color: ";
turtle_col_t* com = new turtle_col_t;
_inp>>com->r>>com->g>>com->b;
std::cerr<<"("<<com->r<<", "<<com->g<<", "<<com->b<<")"<<std::endl;
list.push_back(com);
}
else if (token == "BGCOL")
{
std::cerr<<"Background Color: ";
turtle_bgcol_t* com = new turtle_bgcol_t;
_inp>>com->r>>com->g>>com->b;
std::cerr<<"("<<com->r<<", "<<com->g<<", "<<com->b<<")"<<std::endl;
list.push_back(com);
}
else if (token == "SCALE")
{
std::cerr<<"Scale: ";
turtle_scale_t* com = new turtle_scale_t;
_inp>>com->s;
std::cerr<<com->s<<std::endl;
list.push_back(com);
}
else if (token == "END")
{
std::cerr<<"End"<<std::endl;
turtle_end_t* com = new turtle_end_t;
list.push_back(com);
_inp>>token;
if (!_inp.eof())
{
std::cerr<<"Error: Reading beyond END tag."<<std::endl;
exit(-1);
}
}
return token;
}
void parser_t::parse(std::istream &_inp, turtle_com_list_t &list)
{
list.empty();
if (_inp == NULL)
{
std::cerr<<"Error: Unable to read input stream."<<std::endl;
exit(-1);
}
std::string token;
_inp>>token;
if (token != "BEGIN")
{
std::cerr<<"Error: Missing BEGIN."<<std::endl;
exit(-1);
}
else
{
std::cerr<<"Begin"<<std::endl;
turtle_beg_t* com = new turtle_beg_t;
list.push_back(com);
}
while (!_inp.eof())
{
token=parse_token(_inp, list);
}
if (token != "END")
{
std::cerr<<"Error: No END tag."<<std::endl;
exit(-1);
}
}