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// $Id: parser.cpp 1025 2007-04-30 14:48:32Z hiker $
//
// TuxKart - a fun racing game with go-kart
// Copyright (C) 2004 Matthias Braun <matze@braunis.de>
// code in this file based on lispreader from Mark Probst
//
// 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, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <sstream>
#include <stdexcept>
#include <fstream>
#include <cassert>
#include "parser.hpp"
#include "lisp.hpp"
#include "translation.hpp"
#if defined(WIN32) && !defined(__CYGWIN__)
# define snprintf _snprintf
#endif
namespace lisp
{
Parser::Parser()
: m_lexer(0)
{}
//-----------------------------------------------------------------------------
Parser::~Parser()
{
delete m_lexer;
}
//-----------------------------------------------------------------------------
Lisp*
Parser::parse(const std::string& filename)
{
std::ifstream in(filename.c_str());
if(!in.good())
{
char msg[MAX_ERROR_MESSAGE_LENGTH];
snprintf(msg, sizeof(msg),
_("Couldn't open file '%s'."),
filename.c_str());
throw std::runtime_error(msg);
}
return parse(in);
}
//-----------------------------------------------------------------------------
Lisp*
Parser::parse(std::istream& m_stream)
{
delete m_lexer;
m_lexer = new Lexer(m_stream);
m_token = m_lexer->getNextToken();
Lisp* result = new Lisp(Lisp::TYPE_CONS);
result->m_v.m_cons.m_car = 0;
result->m_v.m_cons.m_cdr = readList();
delete m_lexer;
m_lexer = 0;
return result;
}
//-----------------------------------------------------------------------------
Lisp*
Parser::read()
{
Lisp* result;
switch(m_token)
{
case Lexer::TOKEN_EOF:
{
char msg[MAX_ERROR_MESSAGE_LENGTH];
snprintf(msg, sizeof(msg),
"Parse Error at line %d: Unexpected EOF.",
m_lexer->getLineNumber());
throw std::runtime_error(msg);
}
case Lexer::TOKEN_CLOSE_PAREN:
{
char msg[MAX_ERROR_MESSAGE_LENGTH];
snprintf(msg, sizeof(msg),
"Parse Error at line %d: Unexpected ')'.",
m_lexer->getLineNumber());
throw std::runtime_error(msg);
}
case Lexer::TOKEN_OPEN_PAREN:
result = new Lisp(Lisp::TYPE_CONS);
m_token = m_lexer->getNextToken();
result->m_v.m_cons.m_car = read();
result->m_v.m_cons.m_cdr = readList();
if(m_token != Lexer::TOKEN_CLOSE_PAREN)
{
char msg[MAX_ERROR_MESSAGE_LENGTH];
snprintf(msg, sizeof(msg),
"Parse Error at line %d: Expected ')'.",
m_lexer->getLineNumber());
throw std::runtime_error(msg);
}
break;
case Lexer::TOKEN_SYMBOL:
{
result = new Lisp(Lisp::TYPE_SYMBOL);
const size_t LEN = strlen(m_lexer->getString()) + 1;
result->m_v.m_string = new char[LEN];
memcpy(result->m_v.m_string, m_lexer->getString(), LEN);
break;
}
case Lexer::TOKEN_STRING:
{
result = new Lisp(Lisp::TYPE_STRING);
const size_t LEN = strlen(m_lexer->getString()) + 1;
result->m_v.m_string = new char[LEN];
memcpy(result->m_v.m_string, m_lexer->getString(), LEN);
break;
}
case Lexer::TOKEN_INTEGER:
result = new Lisp(Lisp::TYPE_INTEGER);
sscanf(m_lexer->getString(), "%d", &result->m_v.m_integer);
break;
case Lexer::TOKEN_REAL:
result = new Lisp(Lisp::TYPE_REAL);
sscanf(m_lexer->getString(), "%f", &result->m_v.m_real);
break;
case Lexer::TOKEN_TRUE:
result = new Lisp(Lisp::TYPE_BOOLEAN);
result->m_v.m_boolean = true;
break;
case Lexer::TOKEN_FALSE:
result = new Lisp(Lisp::TYPE_BOOLEAN);
result->m_v.m_boolean = false;
break;
default:
// this should never happen
assert(false);
}
m_token = m_lexer->getNextToken();
return result;
}
//-----------------------------------------------------------------------------
Lisp*
Parser::readList()
{
Lisp* result = 0;
while(m_token != Lexer::TOKEN_CLOSE_PAREN && m_token != Lexer::TOKEN_EOF)
{
Lisp* newlisp = new Lisp(Lisp::TYPE_CONS);
newlisp->m_v.m_cons.m_car = read();
newlisp->m_v.m_cons.m_cdr = result;
result = newlisp;
}
return result;
}
} // end of namespace lisp
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