+/// @file parser_a_b.cpp Check for some silly bugs in the parser.
+#include "ginac.h"
+#include <string>
+#include <iostream>
+#include <stdexcept>
+#include <sstream>
+using namespace GiNaC;
+
+// - 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;
+}
+
+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);
+ if (errors) {
+ std::cout << "Yes, unfortunately:" << std::endl;
+ std::cout << err_str.str();
+ } else {
+ std::cout << "Not found. ";
+ }
+ return errors;
+}
+