28{
33
34 for ( ; ; )
35 {
36 double x = 1.0;
37 double y = 2.0;
38 double z = 3.0;
39 double w = 4.0;
40 double u = 5.0;
41 double v = 6.0;
42
43 symbol_table_t symbol_table;
44 symbol_table.add_variable("x",x);
45 symbol_table.add_variable("y",y);
46 symbol_table.add_variable("z",z);
47 symbol_table.add_variable("w",w);
48 symbol_table.add_variable("u",u);
49 symbol_table.add_variable("v",v);
50 symbol_table.add_constants();
51
52 expression_t expression;
53 expression.register_symbol_table(symbol_table);
54
55 std::string expression_str;
56
57 printf(">> ");
58 std::getline(std::cin,expression_str);
59
60 if (expression_str.empty())
61 continue;
62 else if ("exit" == expression_str)
63 break;
64 else if ("quit" == expression_str)
65 break;
66
67 parser_t parser;
68
69 if (!parser.compile(expression_str,expression))
70 {
71 printf("Error: %s\tExpression: %s\n",
72 parser.error().c_str(),
73 expression_str.c_str());
74
75 for (std::size_t i = 0; i < parser.error_count(); ++i)
76 {
77 err_t error = parser.get_error(i);
78 printf("Error: %02d Pos: %02d Type: [%14s] Message: %s\tExpression: %s\n",
79 static_cast<unsigned int>(i),
80 static_cast<unsigned int>(error.token.position),
82 error.diagnostic.c_str(),
83 expression_str.c_str());
84 }
85
86 continue;
87 }
88
89 double result = expression.value();
90
91 printf("result: %20.10f\n",result);
92 }
93
94 return 0;
95}
std::string to_str(error_mode mode)
