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#include <cstdlib>
#include <iostream>
#include <vector>
#include "fast_float/fast_float.h"
int main_readme() {
std::string const input = "+.1"; // not valid
double result;
fast_float::parse_options options{
fast_float::chars_format::json |
fast_float::chars_format::allow_leading_plus}; // should be ignored
auto answer = fast_float::from_chars_advanced(
input.data(), input.data() + input.size(), result, options);
if (answer.ec == std::errc()) {
std::cerr << "should have failed\n";
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int main_readme2() {
std::string const input = "inf"; // not valid in JSON
double result;
fast_float::parse_options options{
fast_float::chars_format::json |
fast_float::chars_format::allow_leading_plus}; // should be ignored
auto answer = fast_float::from_chars_advanced(
input.data(), input.data() + input.size(), result, options);
if (answer.ec == std::errc()) {
std::cerr << "should have failed\n";
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int main_readme3() {
std::string const input =
"inf"; // not valid in JSON but we allow it with json_or_infnan
double result;
fast_float::parse_options options{
fast_float::chars_format::json_or_infnan |
fast_float::chars_format::allow_leading_plus}; // should be ignored
auto answer = fast_float::from_chars_advanced(
input.data(), input.data() + input.size(), result, options);
if (answer.ec != std::errc() || (!std::isinf(result))) {
std::cerr << "should have parsed infinity\n";
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
struct ExpectedResult {
double value;
std::string junk_chars;
};
struct AcceptedValue {
std::string input;
ExpectedResult expected;
};
struct RejectReason {
fast_float::parse_error error;
intptr_t location_offset;
};
struct RejectedValue {
std::string input;
RejectReason reason;
};
int main() {
std::vector<AcceptedValue> const accept{
{"-0.2", {-0.2, ""}},
{"0.02", {0.02, ""}},
{"0.002", {0.002, ""}},
{"1e+0000", {1., ""}},
{"0e-2", {0., ""}},
{"1e", {1., "e"}},
{"1e+", {1., "e+"}},
{"inf", {std::numeric_limits<double>::infinity(), ""}}};
std::vector<RejectedValue> const reject{
{"-.2", {fast_float::parse_error::missing_integer_after_sign, 1}},
{"00.02", {fast_float::parse_error::leading_zeros_in_integer_part, 0}},
{"0.e+1", {fast_float::parse_error::no_digits_in_fractional_part, 2}},
{"00.e+1", {fast_float::parse_error::leading_zeros_in_integer_part, 0}},
{".25", {fast_float::parse_error::no_digits_in_integer_part, 0}},
// The following cases already start as invalid JSON, so they are
// handled as trailing junk and the error is for not having digits in the
// empty string before the invalid token.
{"+0.25", {fast_float::parse_error::no_digits_in_integer_part, 0}},
{"inf", {fast_float::parse_error::no_digits_in_integer_part, 0}},
{"nan(snan)", {fast_float::parse_error::no_digits_in_integer_part, 0}}};
for (std::size_t i = 0; i < accept.size(); ++i) {
auto const &s = accept[i].input;
auto const &expected = accept[i].expected;
double result;
auto answer =
fast_float::from_chars(s.data(), s.data() + s.size(), result,
fast_float::chars_format::json_or_infnan);
if (answer.ec != std::errc()) {
std::cerr << "json fmt rejected valid json " << s << std::endl;
return EXIT_FAILURE;
}
if (result != expected.value) {
std::cerr << "json fmt gave wrong result " << s << " (expected "
<< expected.value << " got " << result << ")" << std::endl;
return EXIT_FAILURE;
}
if (std::string(answer.ptr) != expected.junk_chars) {
std::cerr << "json fmt has wrong trailing characters " << s
<< " (expected " << expected.junk_chars << " got " << answer.ptr
<< ")" << std::endl;
return EXIT_FAILURE;
}
}
for (std::size_t i = 0; i < reject.size(); ++i) {
auto const &s = reject[i].input;
double result;
auto answer = fast_float::from_chars(s.data(), s.data() + s.size(), result,
fast_float::chars_format::json);
if (answer.ec == std::errc()) {
std::cerr << "json fmt accepted invalid json " << s << std::endl;
return EXIT_FAILURE;
}
}
for (std::size_t i = 0; i < reject.size(); ++i) {
auto const &f = reject[i].input;
auto const &expected_reason = reject[i].reason;
auto answer = fast_float::parse_number_string<true>(
f.data(), f.data() + f.size(),
fast_float::parse_options(
fast_float::chars_format::json |
fast_float::chars_format::allow_leading_plus)); // should be ignored
if (answer.valid) {
std::cerr << "json parse accepted invalid json " << f << std::endl;
return EXIT_FAILURE;
}
if (answer.error != expected_reason.error) {
std::cerr << "json parse failure had invalid error reason " << f
<< std::endl;
return EXIT_FAILURE;
}
intptr_t error_location = answer.lastmatch - f.data();
if (error_location != expected_reason.location_offset) {
std::cerr << "json parse failure had invalid error location " << f
<< " (expected " << expected_reason.location_offset << " got "
<< error_location << ")" << std::endl;
return EXIT_FAILURE;
}
}
if (main_readme() != EXIT_SUCCESS) {
return EXIT_FAILURE;
}
if (main_readme2() != EXIT_SUCCESS) {
return EXIT_FAILURE;
}
#ifndef __FAST_MATH__
if (main_readme3() != EXIT_SUCCESS) {
return EXIT_FAILURE;
}
#endif
return EXIT_SUCCESS;
}
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