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// Copyright (c) 2017-2024, University of Cincinnati, developed by Henry Schreiner
// under NSF AWARD 1414736 and by the respective contributors.
// All rights reserved.
//
// SPDX-License-Identifier: BSD-3-Clause
#include "app_helper.hpp"
#include <complex>
#include <cstdint>
using cx = std::complex<double>;
CLI::Option *
add_option(CLI::App &app, std::string name, cx &variable, std::string description = "", bool defaulted = false) {
CLI::callback_t fun = [&variable](CLI::results_t res) {
double x = 0, y = 0;
bool worked = CLI::detail::lexical_cast(res[0], x) && CLI::detail::lexical_cast(res[1], y);
if(worked)
variable = cx(x, y);
return worked;
};
CLI::Option *opt = app.add_option(name, fun, description, defaulted);
opt->type_name("COMPLEX")->type_size(2);
if(defaulted) {
std::stringstream out;
out << variable;
opt->default_str(out.str());
}
return opt;
}
TEST_CASE_METHOD(TApp, "AddingComplexParser", "[complex]") {
cx comp{0, 0};
add_option(app, "-c,--complex", comp);
args = {"-c", "1.5", "2.5"};
run();
CHECK(comp.real() == Approx(1.5));
CHECK(comp.imag() == Approx(2.5));
}
TEST_CASE_METHOD(TApp, "DefaultedComplex", "[complex]") {
cx comp{1, 2};
add_option(app, "-c,--complex", comp, "", true);
args = {"-c", "4", "3"};
std::string help = app.help();
CHECK_THAT(help, Contains("1"));
CHECK_THAT(help, Contains("2"));
CHECK(comp.real() == Approx(1));
CHECK(comp.imag() == Approx(2));
run();
CHECK(comp.real() == Approx(4));
CHECK(comp.imag() == Approx(3));
}
// an example of custom complex number converter that can be used to add new parsing options
#if defined(__has_include)
#if __has_include(<regex>)
// an example of custom converter that can be used to add new parsing options
#define HAS_REGEX_INCLUDE
#endif
#endif
#ifdef HAS_REGEX_INCLUDE
// Gcc 4.8 and older and the corresponding standard libraries have a broken <regex> so this would
// fail. And if a clang compiler is using libstd++ then this will generate an error as well so this is just a check to
// simplify compilation and prevent a much more complicated #if expression
#include <regex>
namespace CLI {
namespace detail {
// On MSVC and possibly some other new compilers this can be a free standing function without the template
// specialization but this is compiler dependent
template <> bool lexical_cast<std::complex<double>>(const std::string &input, std::complex<double> &output) {
// regular expression to handle complex numbers of various formats
static const std::regex creg(
R"(([+-]?(\d+(\.\d+)?|\.\d+)([eE][+-]?\d+)?)\s*([+-]\s*(\d+(\.\d+)?|\.\d+)([eE][+-]?\d+)?)[ji]*)");
std::smatch m;
double x{0.0}, y{0.0};
bool worked = false;
std::regex_search(input, m, creg);
if(m.size() == 9) {
worked = CLI::detail::lexical_cast(m[1], x) && CLI::detail::lexical_cast(m[6], y);
if(worked) {
if(*m[5].first == '-') {
y = -y;
}
}
} else {
if((input.back() == 'j') || (input.back() == 'i')) {
auto strval = input.substr(0, input.size() - 1);
CLI::detail::trim(strval);
worked = CLI::detail::lexical_cast(strval, y);
} else {
std::string ival = input;
CLI::detail::trim(ival);
worked = CLI::detail::lexical_cast(ival, x);
}
}
if(worked) {
output = cx{x, y};
}
return worked;
}
} // namespace detail
} // namespace CLI
TEST_CASE_METHOD(TApp, "AddingComplexParserDetail", "[complex]") {
bool skip_tests = false;
try { // check if the library actually supports regex, it is possible to link against a non working regex in the
// standard library
std::smatch m;
std::string input = "1.5+2.5j";
static const std::regex creg(
R"(([+-]?(\d+(\.\d+)?|\.\d+)([eE][+-]?\d+)?)\s*([+-]\s*(\d+(\.\d+)?|\.\d+)([eE][+-]?\d+)?)[ji]*)");
auto rsearch = std::regex_search(input, m, creg);
if(!rsearch) {
skip_tests = true;
} else {
CHECK(9u == m.size());
}
} catch(...) {
skip_tests = true;
}
static_assert(CLI::detail::is_complex<cx>::value, "complex should register as complex in this situation");
if(!skip_tests) {
cx comp{0, 0};
app.add_option("-c,--complex", comp, "add a complex number option");
args = {"-c", "1.5+2.5j"};
run();
CHECK(comp.real() == Approx(1.5));
CHECK(comp.imag() == Approx(2.5));
args = {"-c", "1.5-2.5j"};
run();
CHECK(comp.real() == Approx(1.5));
CHECK(comp.imag() == Approx(-2.5));
}
}
#endif
// defining a new complex class
class complex_new {
public:
complex_new() = default;
complex_new(double v1, double v2) : val1_{v1}, val2_{v2} {};
CLI11_NODISCARD double real() const { return val1_; }
CLI11_NODISCARD double imag() const { return val2_; }
private:
double val1_{0.0};
double val2_{0.0};
};
TEST_CASE_METHOD(TApp, "newComplex", "[complex]") {
complex_new cval;
static_assert(CLI::detail::is_complex<complex_new>::value, "complex new does not register as a complex type");
static_assert(CLI::detail::classify_object<complex_new>::value == CLI::detail::object_category::complex_number,
"complex new does not result in complex number categorization");
app.add_option("-c,--complex", cval, "add a complex number option");
args = {"-c", "1.5+2.5j"};
run();
CHECK(cval.real() == Approx(1.5));
CHECK(cval.imag() == Approx(2.5));
args = {"-c", "1.5-2.5j"};
run();
CHECK(cval.real() == Approx(1.5));
CHECK(cval.imag() == Approx(-2.5));
}
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