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LibCore: Rewrite CArgsParser
This is a complete reimplementation of CArgsParser with a different API. Now, CArgsParser properly supports and distinguishes between: * Positional arguments (required or not) * Options Options can be short and/or long. The API allows you to add custom option and argument types. A few types are pre-implemented for convenience: * Boolean options (take no value) * String and integer options (take a required value) * String and integer arguments * Vector-of-string arguments This commit doesn't include changes for all the users of CArgsParser (see next commit for that).
This commit is contained in:
Sergey Bugaev
Andreas Kling
parent
e7512ae2d1
commit
9276582535
2 changed files with 303 additions and 257 deletions
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -27,239 +27,295 @@
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#include "CArgsParser.h"
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#include <AK/StringBuilder.h>
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#include <getopt.h>
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#include <stdio.h>
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bool CArgsParserResult::is_present(const String& arg_name) const
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CArgsParser::CArgsParser()
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{
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return m_args.contains(arg_name);
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add_option(m_show_help, "Display this message", "help", 0);
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}
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String CArgsParserResult::get(const String& arg_name) const
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void CArgsParser::parse(int argc, char** argv)
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{
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return m_args.get(arg_name).value_or({});
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}
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auto print_usage_and_exit = [this, argv] {
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print_usage(stderr, argv[0]);
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exit(1);
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};
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Vector<option> long_options;
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StringBuilder short_options_builder;
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const Vector<String>& CArgsParserResult::get_single_values() const
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{
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return m_single_values;
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}
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int index_of_found_long_option = -1;
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CArgsParser::Arg::Arg(const String& name, const String& description, bool required)
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: name(name)
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, description(description)
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, required(required)
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{
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}
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for (int i = 0; i < m_options.size(); i++) {
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auto& opt = m_options[i];
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if (opt.long_name) {
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option long_opt {
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opt.long_name,
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opt.requires_argument ? required_argument : no_argument,
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&index_of_found_long_option,
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i
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};
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long_options.append(long_opt);
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}
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if (opt.short_name) {
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short_options_builder.append(opt.short_name);
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if (opt.requires_argument)
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short_options_builder.append(':');
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}
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}
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long_options.append({ 0, 0, 0, 0 });
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CArgsParser::Arg::Arg(const String& name, const String& value_name, const String& description, bool required)
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: name(name)
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, description(description)
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, value_name(value_name)
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, required(required)
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{
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}
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String short_options = short_options_builder.build();
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CArgsParser::CArgsParser(const String& program_name)
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: m_program_name(program_name)
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, m_prefix("-")
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{
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}
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CArgsParserResult CArgsParser::parse(int argc, char** argv)
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{
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CArgsParserResult res;
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// We should have at least one parameter
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if (argc < 2)
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return {};
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// We parse the first parameter at the index 1
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if (parse_next_param(1, argv, argc - 1, res) != 0)
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return {};
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if (!check_required_args(res))
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return {};
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return res;
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}
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int CArgsParser::parse_next_param(int index, char** argv, const int params_left, CArgsParserResult& res)
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{
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ASSERT(params_left >= 0);
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if (params_left == 0)
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return 0;
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String param = argv[index];
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// We check if the prefix is found at the beginning of the param name
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if (is_param_valid(param)) {
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auto prefix_length = m_prefix.length();
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String param_name = param.substring(prefix_length, param.length() - prefix_length);
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auto arg = m_args.find(param_name);
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if (arg == m_args.end()) {
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printf("Unknown arg \"");
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if (!param_name.is_null())
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printf("%s", param_name.characters());
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printf("\"\n");
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return -1;
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while (true) {
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int c = getopt_long(argc, argv, short_options.characters(), long_options.data(), nullptr);
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if (c == -1) {
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// We have reached the end.
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break;
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} else if (c == '?') {
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// There was an error, and getopt() has already
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// printed its error message.
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print_usage_and_exit();
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}
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// If this parameter must be followed by a value, we look for it
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if (!arg->value.value_name.is_null()) {
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if (params_left < 2) {
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printf("Missing value for argument %s\n", arg->value.name.characters());
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return -1;
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// Let's see what option we just found.
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Option* found_option = nullptr;
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if (c == 0) {
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// It was a long option.
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ASSERT(index_of_found_long_option >= 0);
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found_option = &m_options[index_of_found_long_option];
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index_of_found_long_option = -1;
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} else {
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// It was a short option, look it up.
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auto it = m_options.find([c](auto& opt) { return c == opt.short_name; });
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ASSERT(!it.is_end());
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found_option = &*it;
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}
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ASSERT(found_option);
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const char* arg = found_option->requires_argument ? optarg : nullptr;
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if (!found_option->accept_value(arg)) {
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fprintf(stderr, "Invalid value for option %s\n", found_option->name_for_display().characters());
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print_usage_and_exit();
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}
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}
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// We're done processing options, now let's parse positional arguments.
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int values_left = argc - optind;
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int num_values_for_arg[m_positional_args.size()];
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int total_values_required = 0;
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for (int i = 0; i < m_positional_args.size(); i++) {
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auto& arg = m_positional_args[i];
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num_values_for_arg[i] = arg.min_values;
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total_values_required += arg.min_values;
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}
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if (total_values_required > values_left)
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print_usage_and_exit();
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int extra_values_to_distribute = values_left - total_values_required;
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for (int i = 0; i < m_positional_args.size(); i++) {
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auto& arg = m_positional_args[i];
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int extra_values_to_this_arg = min(arg.max_values - arg.min_values, extra_values_to_distribute);
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num_values_for_arg[i] += extra_values_to_this_arg;
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extra_values_to_distribute -= extra_values_to_this_arg;
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if (extra_values_to_distribute == 0)
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break;
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}
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if (extra_values_to_distribute > 0) {
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// We still have too many values :(
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print_usage_and_exit();
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}
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for (int i = 0; i < m_positional_args.size(); i++) {
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auto& arg = m_positional_args[i];
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for (int j = 0; j < num_values_for_arg[i]; j++) {
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const char* value = argv[optind++];
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if (!arg.accept_value(value)) {
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fprintf(stderr, "Invalid value for argument %s\n", arg.name);
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print_usage_and_exit();
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}
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}
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}
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String next = String(argv[index + 1]);
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// We're done parsing! :)
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// Now let's show help if requested.
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if (m_show_help) {
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print_usage(stdout, argv[0]);
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exit(0);
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}
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}
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if (is_param_valid(next)) {
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printf("Missing value for argument %s\n", arg->value.name.characters());
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return -1;
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void CArgsParser::print_usage(FILE* file, const char* argv0)
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{
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fprintf(file, "Usage:\n\t%s", argv0);
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for (auto& opt : m_options) {
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if (opt.long_name && !strcmp(opt.long_name, "help"))
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continue;
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if (opt.requires_argument)
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fprintf(file, " [%s %s]", opt.name_for_display().characters(), opt.value_name);
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else
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fprintf(file, " [%s]", opt.name_for_display().characters());
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}
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for (auto& arg : m_positional_args) {
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bool required = arg.min_values > 0;
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bool repeated = arg.max_values > 1;
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if (required && repeated)
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fprintf(file, " <%s...>", arg.name);
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else if (required && !repeated)
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fprintf(file, " <%s>", arg.name);
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else if (!required && repeated)
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fprintf(file, " [%s...]", arg.name);
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else if (!required && !repeated)
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fprintf(file, " [%s]", arg.name);
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}
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if (!m_options.is_empty())
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fprintf(file, "\nOptions:\n");
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for (auto& opt : m_options) {
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auto print_argument = [&]() {
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if (opt.value_name) {
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if (opt.requires_argument)
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fprintf(file, " %s", opt.value_name);
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else
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fprintf(file, " [%s]", opt.value_name);
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}
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res.m_args.set(arg->value.name, next);
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return parse_next_param(index + 2, argv, params_left - 2, res);
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};
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fprintf(file, "\t");
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if (opt.short_name) {
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fprintf(file, "-%c", opt.short_name);
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print_argument();
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}
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if (opt.short_name && opt.long_name)
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fprintf(file, ", ");
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if (opt.long_name) {
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fprintf(file, "--%s", opt.long_name);
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print_argument();
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}
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// Single argument, not followed by a value
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res.m_args.set(arg->value.name, "");
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return parse_next_param(index + 1, argv, params_left - 1, res);
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if (opt.help_string)
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fprintf(file, "\t%s", opt.help_string);
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fprintf(file, "\n");
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}
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// Else, it's a value alone, a file name parameter for example
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res.m_single_values.append(param);
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return parse_next_param(index + 1, argv, params_left - 1, res);
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if (!m_positional_args.is_empty())
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fprintf(file, "\nArguments:\n");
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for (auto& arg : m_positional_args) {
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fprintf(file, "\t%s", arg.name);
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if (arg.help_string)
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fprintf(file, "\t%s", arg.help_string);
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fprintf(file, "\n");
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}
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}
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bool CArgsParser::is_param_valid(const String& param_name)
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void CArgsParser::add_option(Option&& option)
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{
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return param_name.length() >= m_prefix.length() &&
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param_name.substring(0, m_prefix.length()) == m_prefix;
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m_options.append(move(option));
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}
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bool CArgsParser::check_required_args(const CArgsParserResult& res)
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void CArgsParser::add_option(bool& value, const char* help_string, const char* long_name, char short_name)
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{
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for (auto& it : m_args) {
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if (it.value.required) {
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if (!res.is_present(it.value.name))
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return false;
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Option option {
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false,
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help_string,
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long_name,
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short_name,
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nullptr,
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[&value](const char* s) {
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ASSERT(s == nullptr);
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value = true;
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return true;
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}
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}
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};
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add_option(move(option));
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}
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int required_arguments = 0;
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for (const auto& a : m_single_args) {
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if (a.required) {
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required_arguments++;
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void CArgsParser::add_option(const char*& value, const char* help_string, const char* long_name, char short_name, const char* value_name)
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{
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Option option {
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true,
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help_string,
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long_name,
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short_name,
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value_name,
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[&value](const char* s) {
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value = s;
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return true;
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}
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}
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if (required_arguments != 0) {
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if (res.m_single_values.size() < required_arguments)
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return false;
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}
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return true;
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};
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add_option(move(option));
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}
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void CArgsParser::add_required_arg(const String& name, const String& description)
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void CArgsParser::add_option(int& value, const char* help_string, const char* long_name, char short_name, const char* value_name)
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{
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m_args.set(name, Arg(name, description, true));
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}
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void CArgsParser::add_required_arg(const String& name, const String& value_name, const String& description)
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{
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m_args.set(name, Arg(name, value_name, description, true));
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}
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void CArgsParser::add_arg(const String& name, const String& description)
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{
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m_args.set(name, Arg(name, description, false));
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}
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void CArgsParser::add_arg(const String& name, const String& value_name, const String& description)
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{
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m_args.set(name, Arg(name, value_name, description, false));
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}
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void CArgsParser::add_single_value(const String& name)
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{
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m_single_args.append(SingleArg { name, false });
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}
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void CArgsParser::add_required_single_value(const String& name)
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{
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if (m_single_args.size() != 0) {
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// adding required arguments after non-required arguments would be nonsensical
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ASSERT(m_single_args.last().required);
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}
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m_single_args.append(SingleArg { name, true });
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}
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String CArgsParser::get_usage() const
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{
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StringBuilder sb;
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sb.append("usage : ");
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sb.append(m_program_name);
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sb.append(" ");
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for (auto& it : m_args) {
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if (it.value.required)
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sb.append("<");
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else
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sb.append("[");
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sb.append(m_prefix);
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sb.append(it.value.name);
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if (!it.value.value_name.is_null()) {
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sb.append(" ");
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sb.append(it.value.value_name);
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Option option {
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true,
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help_string,
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long_name,
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short_name,
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value_name,
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[&value](const char* s) {
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bool ok;
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value = StringView(s).to_int(ok);
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return ok;
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}
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if (it.value.required)
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sb.append("> ");
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else
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sb.append("] ");
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}
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for (auto& arg : m_single_args) {
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if (arg.required)
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sb.append("<");
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else
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sb.append("[");
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sb.append(arg.name);
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if (arg.required)
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sb.append("> ");
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else
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sb.append("] ");
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}
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sb.append("\n");
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for (auto& it : m_args) {
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sb.append(" ");
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sb.append(m_prefix);
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sb.append(it.value.name);
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if (!it.value.value_name.is_null()) {
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sb.append(" ");
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sb.append(it.value.value_name);
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}
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sb.append(" : ");
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sb.append(it.value.description);
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sb.append("\n");
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}
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return sb.to_string();
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};
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add_option(move(option));
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}
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void CArgsParser::print_usage() const
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void CArgsParser::add_positional_argument(Arg&& arg)
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{
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printf("%s\n", get_usage().characters());
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m_positional_args.append(move(arg));
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}
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void CArgsParser::add_positional_argument(const char*& value, const char* help_string, const char* name, Required required)
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{
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Arg arg {
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help_string,
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name,
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required == Required::Yes ? 1 : 0,
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1,
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[&value](const char* s) {
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value = s;
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return true;
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}
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};
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add_positional_argument(move(arg));
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}
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void CArgsParser::add_positional_argument(int& value, const char* help_string, const char* name, Required required)
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{
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Arg arg {
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help_string,
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name,
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required == Required::Yes ? 1 : 0,
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1,
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[&value](const char* s) {
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bool ok;
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value = StringView(s).to_int(ok);
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return ok;
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}
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};
|
||||
add_positional_argument(move(arg));
|
||||
}
|
||||
|
||||
void CArgsParser::add_positional_argument(Vector<const char*>& values, const char* help_string, const char* name, Required required)
|
||||
{
|
||||
Arg arg {
|
||||
help_string,
|
||||
name,
|
||||
required == Required::Yes ? 1 : 0,
|
||||
INT_MAX,
|
||||
[&values](const char* s) {
|
||||
values.append(s);
|
||||
return true;
|
||||
}
|
||||
};
|
||||
add_positional_argument(move(arg));
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue