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/** @file parser_bugs.cpp
*
* Check for some silly bugs in the parser. */
/*
* GiNaC Copyright (C) 1999-2010 Johannes Gutenberg University Mainz, Germany
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ginac.h"
using namespace GiNaC;
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
// - a - b was misparsed as -a + b due to a bug in parser::parse_unary_expr()
static int check1(std::ostream& err_str)
{
const std::string srep("-a-b");
parser reader;
ex e = reader(srep);
ex a = reader.get_syms()["a"];
ex b = reader.get_syms()["b"];
ex g = - a - b;
ex d = (e - g).expand();
if (!d.is_zero()) {
err_str << "\"" << srep << "\" was misparsed as \""
<< e << "\"" << std::endl;
return 1;
}
return 0;
}
/// Parser was rejecting the valid expression '5 - (3*x)/10'.
static int check2(std::ostream& err_str)
{
const std::string srep("5-(3*x)/10");
parser reader;
ex e = reader(srep);
ex x = reader.get_syms()["x"];
ex g = 5 - (3*x)/10;
ex d = (e - g).expand();
if (!d.is_zero()) {
err_str << "\"" << srep << "\" was misparsed as \""
<< e << "\"" << std::endl;
return 1;
}
return 0;
}
/// parse_literal_expr forget to consume the token, so parser get
/// very confused.
static int check3(std::ostream& err_str)
{
const std::string srep("5-(2*I)/3");
parser reader;
ex e = reader(srep);
ex g = numeric(5) - (numeric(2)*I)/3;
ex d = (e - g).expand();
if (!d.is_zero()) {
err_str << "\"" << srep << "\" was misparsed as \""
<< e << "\"" << std::endl;
return 1;
}
return 0;
}
/// parser happily accepted various junk like 'x^2()+1'
static int check4(std::ostream& err_str)
{
const std::string junk("x^2()+1");
parser reader;
ex e;
try {
e = reader(junk);
err_str << "parser accepts junk: \"" << junk << "\"" << std::endl;
return 1;
} catch (parse_error& err) {
// Ok, parser rejects the nonsense.
return 0;
}
}
int main(int argc, char** argv)
{
std::cout << "checking for parser bugs. " << std::flush;
std::ostringstream err_str;
int errors = 0;
errors += check1(err_str);
errors += check2(err_str);
errors += check3(err_str);
errors += check4(err_str);
if (errors) {
std::cout << "Yes, unfortunately:" << std::endl;
std::cout << err_str.str();
} else {
std::cout << "Not found. ";
}
return errors;
}
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