mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
db886fe18b
This commit moves the implementation of getopt into AK, and converts its API to understand and use StringView instead of char*. Everything else is caught in the crossfire of making Option::accept_value() take a StringView instead of a char const*. With this, we must now pass a Span<StringView> to ArgsParser::parse(), applications using LibMain are unaffected, but anything not using that or taking its own argc/argv has to construct a Vector<StringView> for this method.
283 lines
9.2 KiB
C++
283 lines
9.2 KiB
C++
/*
|
|
* Copyright (c) 2023, Ali Mohammad Pur <mpfard@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/OptionParser.h>
|
|
|
|
namespace AK {
|
|
|
|
void OptionParser::reset_state()
|
|
{
|
|
m_arg_index = 0;
|
|
m_consumed_args = 0;
|
|
m_index_into_multioption_argument = 0;
|
|
m_stop_on_first_non_option = false;
|
|
}
|
|
|
|
OptionParser::GetOptResult OptionParser::getopt(Span<StringView> args, StringView short_options, Span<Option const> long_options, Optional<int&> out_long_option_index)
|
|
{
|
|
m_args = args;
|
|
m_short_options = short_options;
|
|
m_long_options = long_options;
|
|
m_out_long_option_index = out_long_option_index;
|
|
|
|
// In the following case:
|
|
// $ foo bar -o baz
|
|
// we want to parse the option (-o baz) first, and leave the argument (bar)
|
|
// in argv after we return -1 when invoked the second time. So we reorder
|
|
// argv to put options first and positional arguments next. To turn this
|
|
// behavior off, start the short options spec with a "+". This is a GNU
|
|
// extension that we support.
|
|
m_stop_on_first_non_option = short_options.starts_with('+');
|
|
|
|
bool should_reorder_argv = !m_stop_on_first_non_option;
|
|
int res = -1;
|
|
|
|
bool found_an_option = find_next_option();
|
|
auto arg = current_arg();
|
|
|
|
if (!found_an_option) {
|
|
res = -1;
|
|
if (arg == "--")
|
|
m_consumed_args = 1;
|
|
else
|
|
m_consumed_args = 0;
|
|
} else {
|
|
// Alright, so we have an option on our hands!
|
|
bool is_long_option = arg.starts_with("--"sv);
|
|
if (is_long_option)
|
|
res = handle_long_option();
|
|
else
|
|
res = handle_short_option();
|
|
|
|
// If we encountered an error, return immediately.
|
|
if (res == '?') {
|
|
return {
|
|
.result = '?',
|
|
.optopt_value = m_optopt_value,
|
|
.optarg_value = m_optarg_value,
|
|
.consumed_args = 0,
|
|
};
|
|
}
|
|
}
|
|
|
|
if (should_reorder_argv)
|
|
shift_argv();
|
|
|
|
m_arg_index += m_consumed_args;
|
|
|
|
return {
|
|
.result = res,
|
|
.optopt_value = m_optopt_value,
|
|
.optarg_value = m_optarg_value,
|
|
.consumed_args = m_consumed_args,
|
|
};
|
|
}
|
|
|
|
Optional<OptionParser::ArgumentRequirement> OptionParser::lookup_short_option_requirement(char option) const
|
|
{
|
|
Vector<StringView> parts = m_short_options.split_view(option, SplitBehavior::KeepEmpty);
|
|
|
|
VERIFY(parts.size() <= 2);
|
|
if (parts.size() < 2) {
|
|
// Haven't found the option in the spec.
|
|
return {};
|
|
}
|
|
|
|
if (parts[1].starts_with("::"sv)) {
|
|
// If an option is followed by two colons, it optionally accepts an
|
|
// argument.
|
|
return ArgumentRequirement::HasOptionalArgument;
|
|
}
|
|
if (parts[1].starts_with(':')) {
|
|
// If it's followed by one colon, it requires an argument.
|
|
return ArgumentRequirement::HasRequiredArgument;
|
|
}
|
|
// Otherwise, it doesn't accept arguments.
|
|
return ArgumentRequirement::NoArgument;
|
|
}
|
|
|
|
int OptionParser::handle_short_option()
|
|
{
|
|
StringView arg = current_arg();
|
|
VERIFY(arg.starts_with('-'));
|
|
|
|
if (m_index_into_multioption_argument == 0) {
|
|
// Just starting to parse this argument, skip the "-".
|
|
m_index_into_multioption_argument = 1;
|
|
}
|
|
char option = arg[m_index_into_multioption_argument];
|
|
m_index_into_multioption_argument++;
|
|
|
|
auto maybe_requirement = lookup_short_option_requirement(option);
|
|
if (!maybe_requirement.has_value()) {
|
|
m_optopt_value = option;
|
|
reportln("Unrecognized option \x1b[1m-{:c}\x1b[22m", option);
|
|
return '?';
|
|
}
|
|
|
|
auto argument_requirement = *maybe_requirement;
|
|
|
|
// Let's see if we're at the end of this argument already.
|
|
if (m_index_into_multioption_argument < arg.length()) {
|
|
// This not yet the end.
|
|
if (argument_requirement == ArgumentRequirement::NoArgument) {
|
|
m_optarg_value = {};
|
|
m_consumed_args = 0;
|
|
} else {
|
|
// Treat the rest of the argument as the value, the "-ovalue"
|
|
// syntax.
|
|
m_optarg_value = m_args[m_arg_index].substring_view(m_index_into_multioption_argument);
|
|
// Next time, process the next argument.
|
|
m_index_into_multioption_argument = 0;
|
|
m_consumed_args = 1;
|
|
}
|
|
} else {
|
|
m_index_into_multioption_argument = 0;
|
|
if (argument_requirement != ArgumentRequirement::HasRequiredArgument) {
|
|
m_optarg_value = StringView();
|
|
m_consumed_args = 1;
|
|
} else if (m_arg_index + 1 < m_args.size()) {
|
|
// Treat the next argument as a value, the "-o value" syntax.
|
|
m_optarg_value = m_args[m_arg_index + 1];
|
|
m_consumed_args = 2;
|
|
} else {
|
|
reportln("Missing value for option \x1b[1m-{:c}\x1b[22m", option);
|
|
return '?';
|
|
}
|
|
}
|
|
|
|
return option;
|
|
}
|
|
|
|
Optional<OptionParser::Option const&> OptionParser::lookup_long_option(StringView arg) const
|
|
{
|
|
for (size_t index = 0; index < m_long_options.size(); index++) {
|
|
auto& option = m_long_options[index];
|
|
|
|
if (!arg.starts_with(option.name))
|
|
continue;
|
|
|
|
// It would be better to not write out the index at all unless we're
|
|
// sure we've found the right option, but whatever.
|
|
if (m_out_long_option_index.has_value())
|
|
*m_out_long_option_index = index;
|
|
|
|
// Can either be "--option" or "--option=value".
|
|
if (arg.length() == option.name.length()) {
|
|
m_optarg_value = {};
|
|
return option;
|
|
}
|
|
|
|
if (arg[option.name.length()] == '=') {
|
|
m_optarg_value = arg.substring_view(option.name.length() + 1);
|
|
return option;
|
|
}
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
int OptionParser::handle_long_option()
|
|
{
|
|
VERIFY(current_arg().starts_with("--"sv));
|
|
|
|
// We cannot set optopt to anything sensible for long options, so set it to 0.
|
|
m_optopt_value = 0;
|
|
|
|
auto option = lookup_long_option(m_args[m_arg_index].substring_view(2));
|
|
if (!option.has_value()) {
|
|
reportln("Unrecognized option \x1b[1m{}\x1b[22m", m_args[m_arg_index]);
|
|
return '?';
|
|
}
|
|
// lookup_long_option() will also set an override for optarg if the value of the option is
|
|
// specified using "--option=value" syntax.
|
|
|
|
// Figure out whether this option needs and/or has a value (also called "an
|
|
// argument", but let's not call it that to distinguish it from argv
|
|
// elements).
|
|
switch (option->requirement) {
|
|
case ArgumentRequirement::NoArgument:
|
|
if (m_optarg_value.has_value()) {
|
|
reportln("Option \x1b[1m--{}\x1b[22m doesn't accept an argument", option->name);
|
|
return '?';
|
|
}
|
|
m_consumed_args = 1;
|
|
break;
|
|
case ArgumentRequirement::HasOptionalArgument:
|
|
m_consumed_args = 1;
|
|
break;
|
|
case ArgumentRequirement::HasRequiredArgument:
|
|
if (m_optarg_value.has_value()) {
|
|
// Value specified using "--option=value" syntax.
|
|
m_consumed_args = 1;
|
|
} else if (m_arg_index + 1 < m_args.size()) {
|
|
// Treat the next argument as a value in "--option value" syntax.
|
|
m_optarg_value = m_args[m_arg_index + 1];
|
|
m_consumed_args = 2;
|
|
} else {
|
|
reportln("Missing value for option \x1b[1m--{}\x1b[22m", option->name);
|
|
return '?';
|
|
}
|
|
break;
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
|
|
// Now that we've figured the value out, see about reporting this option to
|
|
// our caller.
|
|
if (option->flag != nullptr) {
|
|
*option->flag = option->val;
|
|
return 0;
|
|
}
|
|
return option->val;
|
|
}
|
|
|
|
void OptionParser::shift_argv()
|
|
{
|
|
// We've just parsed an option (which perhaps has a value).
|
|
// Put the option (along with its value, if any) in front of other arguments.
|
|
if (m_consumed_args == 0 || m_skipped_arguments == 0) {
|
|
// Nothing to do!
|
|
return;
|
|
}
|
|
// x -a b c d
|
|
// ---- consumed
|
|
// ->
|
|
// -a b x c d
|
|
|
|
StringView buffer[2]; // We consume at most 2 arguments in one call.
|
|
Span<StringView> buffer_bytes { buffer, array_size(buffer) };
|
|
m_args.slice(m_arg_index, m_consumed_args).copy_to(buffer_bytes);
|
|
m_args.slice(m_arg_index - m_skipped_arguments, m_skipped_arguments).copy_to(m_args.slice(m_arg_index + m_consumed_args - m_skipped_arguments));
|
|
buffer_bytes.slice(0, m_consumed_args).copy_to(m_args.slice(m_arg_index - m_skipped_arguments, m_consumed_args));
|
|
}
|
|
|
|
bool OptionParser::find_next_option()
|
|
{
|
|
for (m_skipped_arguments = 0; m_arg_index < m_args.size(); m_skipped_arguments++, m_arg_index++) {
|
|
StringView arg = current_arg();
|
|
// Anything that doesn't start with a "-" is not an option.
|
|
// As a special case, a single "-" is not an option either.
|
|
// (It's typically used by programs to refer to stdin).
|
|
if (!arg.starts_with('-') || arg == "-") {
|
|
if (m_stop_on_first_non_option)
|
|
return false;
|
|
continue;
|
|
}
|
|
|
|
// As another special case, a "--" is not an option either, and we stop
|
|
// looking for further options if we encounter it.
|
|
if (arg == "--")
|
|
return false;
|
|
// Otherwise, we have found an option!
|
|
return true;
|
|
}
|
|
|
|
// Reached the end and still found no options.
|
|
return false;
|
|
}
|
|
|
|
}
|