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#include <Warp/Expression.hpp> | |
using NaturalNumberConstantExpression = ConstantExpression< | |
to_size_t, | |
size_t | |
>; | |
/*constexpr static auto plus_term = ctpg::char_term{ | |
'+', | |
1, | |
ctpg::associativity::ltor | |
}; | |
*/ | |
constexpr static auto factor_parser = ctpg::parser{ | |
NaturalNumberConstantExpression::factor, | |
// ctpg::terms(plus_term), | |
NaturalNumberConstantExpression::terms, | |
// ctpg::nterms(NaturalNumberConstantExpression::factor), | |
NaturalNumberConstantExpression::nterms, | |
// ctpg::rules()// | |
// NaturalNumberConstantExpression::rules | |
ctpg::rules( | |
NaturalNumberConstantExpression::factor(NaturalNumberConstantExpression::plus_term ) >= [](auto){ return 1; }, | |
NaturalNumberConstantExpression::factor(NaturalNumberConstantExpression::literal_term, NaturalNumberConstantExpression::plus_term ) >= [](auto ,auto){ return 2; } | |
) | |
}; | |
int main( int argc, char** args ) | |
{ | |
std::cout << "Hello world! Please enter your expression: "; | |
for( std::string input = "4*10+2"; input != "thanks :)"; std::getline( std::cin, input ) ) | |
{ | |
std::cout << "Got: " << input << "\n"; | |
if( auto parse_result = factor_parser.parse( | |
//ctpg::parse_options{}.set_verbose(), | |
ctpg::buffers::string_buffer( input.c_str() ), std::cerr | |
); | |
parse_result.has_value() == true | |
) | |
std::cout << "Result: " << parse_result.value() << "\n"; | |
else | |
std::cerr << "Error failed to parse!\n"; | |
std::cout << "Enter prompt please: "; | |
} | |
return 0; | |
} |
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