mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-11 17:00:37 +00:00
e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
/*
|
|
* Copyright (c) 2020, Nico Weber <thakis@chromium.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Format.h>
|
|
#include <AK/StdLibExtras.h>
|
|
#include <AK/Vector.h>
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <LibCore/System.h>
|
|
#include <LibMain/Main.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
char const* const g_usage = R"(Usage:
|
|
seq [-h|--help]
|
|
seq LAST
|
|
seq FIRST LAST
|
|
seq FIRST INCREMENT LAST
|
|
)";
|
|
|
|
static void print_usage(FILE* stream)
|
|
{
|
|
fputs(g_usage, stream);
|
|
}
|
|
|
|
static double get_double(char const* name, StringView d_string, size_t* number_of_decimals)
|
|
{
|
|
auto d = d_string.to_number<double>();
|
|
if (!d.has_value()) {
|
|
warnln("{}: invalid argument \"{}\"", name, d_string);
|
|
print_usage(stderr);
|
|
exit(1);
|
|
}
|
|
|
|
if (auto dot = d_string.find('.'); dot.has_value())
|
|
*number_of_decimals = d_string.length() - *dot - 1;
|
|
else
|
|
*number_of_decimals = 0;
|
|
|
|
return *d;
|
|
}
|
|
|
|
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
|
{
|
|
TRY(Core::System::pledge("stdio"));
|
|
TRY(Core::System::unveil(nullptr, nullptr));
|
|
|
|
StringView separator = "\n"sv;
|
|
StringView terminator = ""sv;
|
|
Vector<StringView> parameters;
|
|
|
|
Core::ArgsParser args_parser;
|
|
args_parser.add_option(separator, "Characters to print after each number (default: \\n)", "separator", 's', "separator");
|
|
args_parser.add_option(terminator, "Characters to print at the end of the sequence", "terminator", 't', "terminator");
|
|
args_parser.add_positional_argument(parameters, "1 to 3 parameters, interpreted as LAST, FIRST LAST, or FIRST INCREMENT LAST", "parameters");
|
|
args_parser.parse(arguments);
|
|
|
|
double start = 1;
|
|
double step = 1;
|
|
double end = 1;
|
|
size_t number_of_start_decimals = 0;
|
|
size_t number_of_step_decimals = 0;
|
|
size_t number_of_end_decimals = 0;
|
|
switch (parameters.size()) {
|
|
case 1:
|
|
end = get_double(arguments.argv[0], parameters[0], &number_of_end_decimals);
|
|
break;
|
|
case 2:
|
|
start = get_double(arguments.argv[0], parameters[0], &number_of_start_decimals);
|
|
end = get_double(arguments.argv[0], parameters[1], &number_of_end_decimals);
|
|
break;
|
|
case 3:
|
|
start = get_double(arguments.argv[0], parameters[0], &number_of_start_decimals);
|
|
step = get_double(arguments.argv[0], parameters[1], &number_of_step_decimals);
|
|
end = get_double(arguments.argv[0], parameters[2], &number_of_end_decimals);
|
|
break;
|
|
default:
|
|
warnln("{}: unexpected number of arguments", arguments.argv[0]);
|
|
print_usage(stderr);
|
|
return 1;
|
|
}
|
|
|
|
if (step == 0) {
|
|
warnln("{}: increment must not be 0", arguments.argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
if (__builtin_isnan(start) || __builtin_isnan(step) || __builtin_isnan(end)) {
|
|
warnln("{}: start, step, and end must not be NaN", arguments.argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
size_t number_of_decimals = max(number_of_start_decimals, max(number_of_step_decimals, number_of_end_decimals));
|
|
|
|
int n = static_cast<int>((end - start) / step);
|
|
double d = start;
|
|
for (int i = 0; i <= n; ++i) {
|
|
char buf[40];
|
|
snprintf(buf, sizeof(buf), "%f", d);
|
|
if (char* dot = strchr(buf, '.')) {
|
|
if (number_of_decimals == 0)
|
|
*dot = '\0';
|
|
else if ((dot - buf) + 1 + number_of_decimals < (int)sizeof(buf))
|
|
dot[1 + number_of_decimals] = '\0';
|
|
}
|
|
out("{}{}", buf, separator);
|
|
d += step;
|
|
}
|
|
|
|
if (!terminator.is_empty())
|
|
out(terminator);
|
|
|
|
return 0;
|
|
}
|