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Diffstat (limited to 'src/apps/cam/options.cpp')
| -rw-r--r-- | src/apps/cam/options.cpp | 1141 |
1 files changed, 0 insertions, 1141 deletions
diff --git a/src/apps/cam/options.cpp b/src/apps/cam/options.cpp deleted file mode 100644 index 4f7e8691..00000000 --- a/src/apps/cam/options.cpp +++ /dev/null @@ -1,1141 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * Copyright (C) 2019, Google Inc. - * - * options.cpp - cam - Options parsing - */ - -#include <assert.h> -#include <getopt.h> -#include <iomanip> -#include <iostream> -#include <string.h> - -#include "options.h" - -/** - * \enum OptionArgument - * \brief Indicate if an option takes an argument - * - * \var OptionArgument::ArgumentNone - * \brief The option doesn't accept any argument - * - * \var OptionArgument::ArgumentRequired - * \brief The option requires an argument - * - * \var OptionArgument::ArgumentOptional - * \brief The option accepts an optional argument - */ - -/** - * \enum OptionType - * \brief The type of argument for an option - * - * \var OptionType::OptionNone - * \brief No argument type, used for options that take no argument - * - * \var OptionType::OptionInteger - * \brief Integer argument type, with an optional base prefix (`0` for base 8, - * `0x` for base 16, none for base 10) - * - * \var OptionType::OptionString - * \brief String argument - * - * \var OptionType::OptionKeyValue - * \brief key=value list argument - */ - -/* ----------------------------------------------------------------------------- - * Option - */ - -/** - * \struct Option - * \brief Store metadata about an option - * - * \var Option::opt - * \brief The option identifier - * - * \var Option::type - * \brief The type of the option argument - * - * \var Option::name - * \brief The option name - * - * \var Option::argument - * \brief Whether the option accepts an optional argument, a mandatory - * argument, or no argument at all - * - * \var Option::argumentName - * \brief The argument name used in the help text - * - * \var Option::help - * \brief The help text (may be a multi-line string) - * - * \var Option::keyValueParser - * \brief For options of type OptionType::OptionKeyValue, the key-value parser - * to parse the argument - * - * \var Option::isArray - * \brief Whether the option can appear once or multiple times - * - * \var Option::parent - * \brief The parent option - * - * \var Option::children - * \brief List of child options, storing all options whose parent is this option - * - * \fn Option::hasShortOption() - * \brief Tell if the option has a short option specifier (e.g. `-f`) - * \return True if the option has a short option specifier, false otherwise - * - * \fn Option::hasLongOption() - * \brief Tell if the option has a long option specifier (e.g. `--foo`) - * \return True if the option has a long option specifier, false otherwise - */ -struct Option { - int opt; - OptionType type; - const char *name; - OptionArgument argument; - const char *argumentName; - const char *help; - KeyValueParser *keyValueParser; - bool isArray; - Option *parent; - std::list<Option> children; - - bool hasShortOption() const { return isalnum(opt); } - bool hasLongOption() const { return name != nullptr; } - const char *typeName() const; - std::string optionName() const; -}; - -/** - * \brief Retrieve a string describing the option type - * \return A string describing the option type - */ -const char *Option::typeName() const -{ - switch (type) { - case OptionNone: - return "none"; - - case OptionInteger: - return "integer"; - - case OptionString: - return "string"; - - case OptionKeyValue: - return "key=value"; - } - - return "unknown"; -} - -/** - * \brief Retrieve a string describing the option name, with leading dashes - * \return A string describing the option name, as a long option identifier - * (double dash) if the option has a name, or a short option identifier (single - * dash) otherwise - */ -std::string Option::optionName() const -{ - if (name) - return "--" + std::string(name); - else - return "-" + std::string(1, opt); -} - -/* ----------------------------------------------------------------------------- - * OptionBase<T> - */ - -/** - * \class template<typename T> OptionBase - * \brief Container to store the values of parsed options - * \tparam T The type through which options are identified - * - * The OptionsBase class is generated by a parser (either OptionsParser or - * KeyValueParser) when parsing options. It stores values for all the options - * found, and exposes accessor functions to retrieve them. The options are - * accessed through an identifier to type \a T, which is an int referencing an - * Option::opt for OptionsParser, or a std::string referencing an Option::name - * for KeyValueParser. - */ - -/** - * \fn OptionsBase::OptionsBase() - * \brief Construct an OptionsBase instance - * - * The constructed instance is initially invalid, and will be populated by the - * options parser. - */ - -/** - * \brief Tell if the stored options list is empty - * \return True if the container is empty, false otherwise - */ -template<typename T> -bool OptionsBase<T>::empty() const -{ - return values_.empty(); -} - -/** - * \brief Tell if the options parsing completed successfully - * \return True if the container is returned after successfully parsing - * options, false if it is returned after an error was detected during parsing - */ -template<typename T> -bool OptionsBase<T>::valid() const -{ - return valid_; -} - -/** - * \brief Tell if the option \a opt is specified - * \param[in] opt The option to search for - * \return True if the \a opt option is set, false otherwise - */ -template<typename T> -bool OptionsBase<T>::isSet(const T &opt) const -{ - return values_.find(opt) != values_.end(); -} - -/** - * \brief Retrieve the value of option \a opt - * \param[in] opt The option to retrieve - * \return The value of option \a opt if found, an empty OptionValue otherwise - */ -template<typename T> -const OptionValue &OptionsBase<T>::operator[](const T &opt) const -{ - static const OptionValue empty; - - auto it = values_.find(opt); - if (it != values_.end()) - return it->second; - return empty; -} - -/** - * \brief Mark the container as invalid - * - * This function can be used in a key-value parser's override of the - * KeyValueParser::parse() function to mark the returned options as invalid if - * a validation error occurs. - */ -template<typename T> -void OptionsBase<T>::invalidate() -{ - valid_ = false; -} - -template<typename T> -bool OptionsBase<T>::parseValue(const T &opt, const Option &option, - const char *arg) -{ - OptionValue value; - - switch (option.type) { - case OptionNone: - break; - - case OptionInteger: - unsigned int integer; - - if (arg) { - char *endptr; - integer = strtoul(arg, &endptr, 0); - if (*endptr != '\0') - return false; - } else { - integer = 0; - } - - value = OptionValue(integer); - break; - - case OptionString: - value = OptionValue(arg ? arg : ""); - break; - - case OptionKeyValue: - KeyValueParser *kvParser = option.keyValueParser; - KeyValueParser::Options keyValues = kvParser->parse(arg); - if (!keyValues.valid()) - return false; - - value = OptionValue(keyValues); - break; - } - - if (option.isArray) - values_[opt].addValue(value); - else - values_[opt] = value; - - return true; -} - -template class OptionsBase<int>; -template class OptionsBase<std::string>; - -/* ----------------------------------------------------------------------------- - * KeyValueParser - */ - -/** - * \class KeyValueParser - * \brief A specialized parser for list of key-value pairs - * - * The KeyValueParser is an options parser for comma-separated lists of - * `key=value` pairs. The supported keys are added to the parser with - * addOption(). A given key can only appear once in the parsed list. - * - * Instances of this class can be passed to the OptionsParser::addOption() - * function to create options that take key-value pairs as an option argument. - * Specialized versions of the key-value parser can be created by inheriting - * from this class, to pre-build the options list in the constructor, and to add - * custom validation by overriding the parse() function. - */ - -/** - * \class KeyValueParser::Options - * \brief An option list generated by the key-value parser - * - * This is a specialization of OptionsBase with the option reference type set to - * std::string. - */ - -KeyValueParser::KeyValueParser() = default; -KeyValueParser::~KeyValueParser() = default; - -/** - * \brief Add a supported option to the parser - * \param[in] name The option name, corresponding to the key name in the - * key=value pair. The name shall be unique. - * \param[in] type The type of the value in the key=value pair - * \param[in] help The help text - * \param[in] argument Whether the value is optional, mandatory or not allowed. - * Shall be ArgumentNone if \a type is OptionNone. - * - * \sa OptionsParser - * - * \return True if the option was added successfully, false if an error - * occurred. - */ -bool KeyValueParser::addOption(const char *name, OptionType type, - const char *help, OptionArgument argument) -{ - if (!name) - return false; - if (!help || help[0] == '\0') - return false; - if (argument != ArgumentNone && type == OptionNone) - return false; - - /* Reject duplicate options. */ - if (optionsMap_.find(name) != optionsMap_.end()) - return false; - - optionsMap_[name] = Option({ 0, type, name, argument, nullptr, - help, nullptr, false, nullptr, {} }); - return true; -} - -/** - * \brief Parse a string containing a list of key-value pairs - * \param[in] arguments The key-value pairs string to parse - * - * If a parsing error occurs, the parsing stops and the function returns an - * invalid container. The container is populated with the options successfully - * parsed so far. - * - * \return A valid container with the list of parsed options on success, or an - * invalid container otherwise - */ -KeyValueParser::Options KeyValueParser::parse(const char *arguments) -{ - Options options; - - for (const char *pair = arguments; *arguments != '\0'; pair = arguments) { - const char *comma = strchrnul(arguments, ','); - size_t len = comma - pair; - - /* Skip over the comma. */ - arguments = *comma == ',' ? comma + 1 : comma; - - /* Skip to the next pair if the pair is empty. */ - if (!len) - continue; - - std::string key; - std::string value; - - const char *separator = static_cast<const char *>(memchr(pair, '=', len)); - if (!separator) { - key = std::string(pair, len); - value = ""; - } else { - key = std::string(pair, separator - pair); - value = std::string(separator + 1, comma - separator - 1); - } - - /* The key is mandatory, the value might be optional. */ - if (key.empty()) - continue; - - if (optionsMap_.find(key) == optionsMap_.end()) { - std::cerr << "Invalid option " << key << std::endl; - return options; - } - - OptionArgument arg = optionsMap_[key].argument; - if (value.empty() && arg == ArgumentRequired) { - std::cerr << "Option " << key << " requires an argument" - << std::endl; - return options; - } else if (!value.empty() && arg == ArgumentNone) { - std::cerr << "Option " << key << " takes no argument" - << std::endl; - return options; - } - - const Option &option = optionsMap_[key]; - if (!options.parseValue(key, option, value.c_str())) { - std::cerr << "Failed to parse '" << value << "' as " - << option.typeName() << " for option " << key - << std::endl; - return options; - } - } - - options.valid_ = true; - return options; -} - -unsigned int KeyValueParser::maxOptionLength() const -{ - unsigned int maxLength = 0; - - for (auto const &iter : optionsMap_) { - const Option &option = iter.second; - unsigned int length = 10 + strlen(option.name); - if (option.argument != ArgumentNone) - length += 1 + strlen(option.typeName()); - if (option.argument == ArgumentOptional) - length += 2; - - if (length > maxLength) - maxLength = length; - } - - return maxLength; -} - -void KeyValueParser::usage(int indent) -{ - for (auto const &iter : optionsMap_) { - const Option &option = iter.second; - std::string argument = std::string(" ") + option.name; - - if (option.argument != ArgumentNone) { - if (option.argument == ArgumentOptional) - argument += "[="; - else - argument += "="; - argument += option.typeName(); - if (option.argument == ArgumentOptional) - argument += "]"; - } - - std::cerr << std::setw(indent) << argument; - - for (const char *help = option.help, *end = help; end;) { - end = strchr(help, '\n'); - if (end) { - std::cerr << std::string(help, end - help + 1); - std::cerr << std::setw(indent) << " "; - help = end + 1; - } else { - std::cerr << help << std::endl; - } - } - } -} - -/* ----------------------------------------------------------------------------- - * OptionValue - */ - -/** - * \class OptionValue - * \brief Container to store the value of an option - * - * The OptionValue class is a variant-type container to store the value of an - * option. It supports empty values, integers, strings, key-value lists, as well - * as arrays of those types. For array values, all array elements shall have the - * same type. - * - * OptionValue instances are organized in a tree-based structure that matches - * the parent-child relationship of the options added to the parser. Children - * are retrieved with the children() function, and are stored as an - * OptionsBase<int>. - */ - -/** - * \enum OptionValue::ValueType - * \brief The option value type - * - * \var OptionValue::ValueType::ValueNone - * \brief Empty value - * - * \var OptionValue::ValueType::ValueInteger - * \brief Integer value (int) - * - * \var OptionValue::ValueType::ValueString - * \brief String value (std::string) - * - * \var OptionValue::ValueType::ValueKeyValue - * \brief Key-value list value (KeyValueParser::Options) - * - * \var OptionValue::ValueType::ValueArray - * \brief Array value - */ - -/** - * \brief Construct an empty OptionValue instance - * - * The value type is set to ValueType::ValueNone. - */ -OptionValue::OptionValue() - : type_(ValueNone), integer_(0) -{ -} - -/** - * \brief Construct an integer OptionValue instance - * \param[in] value The integer value - * - * The value type is set to ValueType::ValueInteger. - */ -OptionValue::OptionValue(int value) - : type_(ValueInteger), integer_(value) -{ -} - -/** - * \brief Construct a string OptionValue instance - * \param[in] value The string value - * - * The value type is set to ValueType::ValueString. - */ -OptionValue::OptionValue(const char *value) - : type_(ValueString), integer_(0), string_(value) -{ -} - -/** - * \brief Construct a string OptionValue instance - * \param[in] value The string value - * - * The value type is set to ValueType::ValueString. - */ -OptionValue::OptionValue(const std::string &value) - : type_(ValueString), integer_(0), string_(value) -{ -} - -/** - * \brief Construct a key-value OptionValue instance - * \param[in] value The key-value list - * - * The value type is set to ValueType::ValueKeyValue. - */ -OptionValue::OptionValue(const KeyValueParser::Options &value) - : type_(ValueKeyValue), integer_(0), keyValues_(value) -{ -} - -/** - * \brief Add an entry to an array value - * \param[in] value The entry value - * - * This function can only be called if the OptionValue type is - * ValueType::ValueNone or ValueType::ValueArray. Upon return, the type will be - * set to ValueType::ValueArray. - */ -void OptionValue::addValue(const OptionValue &value) -{ - assert(type_ == ValueNone || type_ == ValueArray); - - type_ = ValueArray; - array_.push_back(value); -} - -/** - * \fn OptionValue::type() - * \brief Retrieve the value type - * \return The value type - */ - -/** - * \fn OptionValue::empty() - * \brief Check if the value is empty - * \return True if the value is empty (type set to ValueType::ValueNone), or - * false otherwise - */ - -/** - * \brief Cast the value to an int - * \return The option value as an int, or 0 if the value type isn't - * ValueType::ValueInteger - */ -OptionValue::operator int() const -{ - return toInteger(); -} - -/** - * \brief Cast the value to a std::string - * \return The option value as an std::string, or an empty string if the value - * type isn't ValueType::ValueString - */ -OptionValue::operator std::string() const -{ - return toString(); -} - -/** - * \brief Retrieve the value as an int - * \return The option value as an int, or 0 if the value type isn't - * ValueType::ValueInteger - */ -int OptionValue::toInteger() const -{ - if (type_ != ValueInteger) - return 0; - - return integer_; -} - -/** - * \brief Retrieve the value as a std::string - * \return The option value as a std::string, or an empty string if the value - * type isn't ValueType::ValueString - */ -std::string OptionValue::toString() const -{ - if (type_ != ValueString) - return std::string(); - - return string_; -} - -/** - * \brief Retrieve the value as a key-value list - * - * The behaviour is undefined if the value type isn't ValueType::ValueKeyValue. - * - * \return The option value as a KeyValueParser::Options - */ -const KeyValueParser::Options &OptionValue::toKeyValues() const -{ - assert(type_ == ValueKeyValue); - return keyValues_; -} - -/** - * \brief Retrieve the value as an array - * - * The behaviour is undefined if the value type isn't ValueType::ValueArray. - * - * \return The option value as a std::vector of OptionValue - */ -const std::vector<OptionValue> &OptionValue::toArray() const -{ - assert(type_ == ValueArray); - return array_; -} - -/** - * \brief Retrieve the list of child values - * \return The list of child values - */ -const OptionsParser::Options &OptionValue::children() const -{ - return children_; -} - -/* ----------------------------------------------------------------------------- - * OptionsParser - */ - -/** - * \class OptionsParser - * \brief A command line options parser - * - * The OptionsParser class is an easy to use options parser for POSIX-style - * command line options. Supports short (e.g. `-f`) and long (e.g. `--foo`) - * options, optional and mandatory arguments, automatic parsing arguments for - * integer types and comma-separated list of key=value pairs, and multi-value - * arguments. It handles help text generation automatically. - * - * An OptionsParser instance is initialized by adding supported options with - * addOption(). Options are specified by an identifier and a name. If the - * identifier is an alphanumeric character, it will be used by the parser as a - * short option identifier (e.g. `-f`). The name, if specified, will be used as - * a long option identifier (e.g. `--foo`). It should not include the double - * dashes. The name is optional if the option identifier is an alphanumeric - * character and mandatory otherwise. - * - * An option has a mandatory help text, which is used to print the full options - * list with the usage() function. The help text may be a multi-line string. - * Correct indentation of the help text is handled automatically. - * - * Options accept arguments when created with OptionArgument::ArgumentRequired - * or OptionArgument::ArgumentOptional. If the argument is required, it can be - * specified as a positional argument after the option (e.g. `-f bar`, - * `--foo bar`), collated with the short option (e.g. `-fbar`) or separated from - * the long option by an equal sign (e.g. `--foo=bar`'). When the argument is - * optional, it must be collated with the short option or separated from the - * long option by an equal sign. - * - * If an option has a required or optional argument, an argument name must be - * set when adding the option. The argument name is used in the help text as a - * place holder for an argument value. For instance, a `--write` option that - * takes a file name as an argument could set the argument name to `filename`, - * and the help text would display `--write filename`. This is only used to - * clarify the help text and has no effect on option parsing. - * - * The option type tells the parser how to process the argument. Arguments for - * string options (OptionType::OptionString) are stored as-is without any - * processing. Arguments for integer options (OptionType::OptionInteger) are - * converted to an integer value, using an optional base prefix (`0` for base 8, - * `0x` for base 16, none for base 10). Arguments for key-value options are - * parsed by a KeyValueParser given to addOption(). - * - * By default, a given option can appear once only in the parsed command line. - * If the option is created as an array option, the parser will accept multiple - * instances of the option. The order in which identical options are specified - * is preserved in the values of an array option. - * - * After preparing the parser, it can be used any number of times to parse - * command line options with the parse() function. The function returns an - * Options instance that stores the values for the parsed options. The - * Options::isSet() function can be used to test if an option has been found, - * and is the only way to access options that take no argument (specified by - * OptionType::OptionNone and OptionArgument::ArgumentNone). For options that - * accept an argument, the option value can be access by Options::operator[]() - * using the option identifier as the key. The order in which different options - * are specified on the command line isn't preserved. - * - * Options can be created with parent-child relationships to organize them as a - * tree instead of a flat list. When parsing a command line, the child options - * are considered related to the parent option that precedes them. This is - * useful when the parent is an array option. The Options values list generated - * by the parser then turns into a tree, which each parent value storing the - * values of child options that follow that instance of the parent option. - * For instance, with a `capture` option specified as a child of a `camera` - * array option, parsing the command line - * - * `--camera 1 --capture=10 --camera 2 --capture=20` - * - * will return an Options instance containing a single OptionValue instance of - * array type, for the `camera` option. The OptionValue will contain two - * entries, with the first entry containing the integer value 1 and the second - * entry the integer value 2. Each of those entries will in turn store an - * Options instance that contains the respective children. The first entry will - * store in its children a `capture` option of value 10, and the second entry a - * `capture` option of value 20. - * - * The command line - * - * `--capture=10 --camera 1` - * - * would result in a parsing error, as the `capture` option has no preceding - * `camera` option on the command line. - */ - -/** - * \class OptionsParser::Options - * \brief An option list generated by the options parser - * - * This is a specialization of OptionsBase with the option reference type set to - * int. - */ - -OptionsParser::OptionsParser() = default; -OptionsParser::~OptionsParser() = default; - -/** - * \brief Add an option to the parser - * \param[in] opt The option identifier - * \param[in] type The type of the option argument - * \param[in] help The help text (may be a multi-line string) - * \param[in] name The option name - * \param[in] argument Whether the option accepts an optional argument, a - * mandatory argument, or no argument at all - * \param[in] argumentName The argument name used in the help text - * \param[in] array Whether the option can appear once or multiple times - * \param[in] parent The identifier of the parent option (optional) - * - * \return True if the option was added successfully, false if an error - * occurred. - */ -bool OptionsParser::addOption(int opt, OptionType type, const char *help, - const char *name, OptionArgument argument, - const char *argumentName, bool array, int parent) -{ - /* - * Options must have at least a short or long name, and a text message. - * If an argument is accepted, it must be described by argumentName. - */ - if (!isalnum(opt) && !name) - return false; - if (!help || help[0] == '\0') - return false; - if (argument != ArgumentNone && !argumentName) - return false; - - /* Reject duplicate options. */ - if (optionsMap_.find(opt) != optionsMap_.end()) - return false; - - /* - * If a parent is specified, create the option as a child of its parent. - * Otherwise, create it in the parser's options list. - */ - Option *option; - - if (parent) { - auto iter = optionsMap_.find(parent); - if (iter == optionsMap_.end()) - return false; - - Option *parentOpt = iter->second; - parentOpt->children.push_back({ - opt, type, name, argument, argumentName, help, nullptr, - array, parentOpt, {} - }); - option = &parentOpt->children.back(); - } else { - options_.push_back({ opt, type, name, argument, argumentName, - help, nullptr, array, nullptr, {} }); - option = &options_.back(); - } - - optionsMap_[opt] = option; - - return true; -} - -/** - * \brief Add a key-value pair option to the parser - * \param[in] opt The option identifier - * \param[in] parser The KeyValueParser for the option value - * \param[in] help The help text (may be a multi-line string) - * \param[in] name The option name - * \param[in] array Whether the option can appear once or multiple times - * - * \sa Option - * - * \return True if the option was added successfully, false if an error - * occurred. - */ -bool OptionsParser::addOption(int opt, KeyValueParser *parser, const char *help, - const char *name, bool array, int parent) -{ - if (!addOption(opt, OptionKeyValue, help, name, ArgumentRequired, - "key=value[,key=value,...]", array, parent)) - return false; - - optionsMap_[opt]->keyValueParser = parser; - return true; -} - -/** - * \brief Parse command line arguments - * \param[in] argc The number of arguments in the \a argv array - * \param[in] argv The array of arguments - * - * If a parsing error occurs, the parsing stops, the function prints an error - * message that identifies the invalid argument, prints usage information with - * usage(), and returns an invalid container. The container is populated with - * the options successfully parsed so far. - * - * \return A valid container with the list of parsed options on success, or an - * invalid container otherwise - */ -OptionsParser::Options OptionsParser::parse(int argc, char **argv) -{ - OptionsParser::Options options; - - /* - * Allocate short and long options arrays large enough to contain all - * options. - */ - char shortOptions[optionsMap_.size() * 3 + 2]; - struct option longOptions[optionsMap_.size() + 1]; - unsigned int ids = 0; - unsigned int idl = 0; - - shortOptions[ids++] = ':'; - - for (const auto [opt, option] : optionsMap_) { - if (option->hasShortOption()) { - shortOptions[ids++] = opt; - if (option->argument != ArgumentNone) - shortOptions[ids++] = ':'; - if (option->argument == ArgumentOptional) - shortOptions[ids++] = ':'; - } - - if (option->hasLongOption()) { - longOptions[idl].name = option->name; - - switch (option->argument) { - case ArgumentNone: - longOptions[idl].has_arg = no_argument; - break; - case ArgumentRequired: - longOptions[idl].has_arg = required_argument; - break; - case ArgumentOptional: - longOptions[idl].has_arg = optional_argument; - break; - } - - longOptions[idl].flag = 0; - longOptions[idl].val = option->opt; - idl++; - } - } - - shortOptions[ids] = '\0'; - memset(&longOptions[idl], 0, sizeof(longOptions[idl])); - - opterr = 0; - - while (true) { - int c = getopt_long(argc, argv, shortOptions, longOptions, nullptr); - - if (c == -1) - break; - - if (c == '?' || c == ':') { - if (c == '?') - std::cerr << "Invalid option "; - else - std::cerr << "Missing argument for option "; - std::cerr << argv[optind - 1] << std::endl; - - usage(); - return options; - } - - const Option &option = *optionsMap_[c]; - if (!parseValue(option, optarg, &options)) { - usage(); - return options; - } - } - - if (optind < argc) { - std::cerr << "Invalid non-option argument '" << argv[optind] - << "'" << std::endl; - usage(); - return options; - } - - options.valid_ = true; - return options; -} - -/** - * \brief Print usage text to std::cerr - * - * The usage text list all the supported option with their arguments. It is - * generated automatically from the options added to the parser. Caller of this - * function may print additional usage information for the application before - * the list of options. - */ -void OptionsParser::usage() -{ - unsigned int indent = 0; - - for (const auto &opt : optionsMap_) { - const Option *option = opt.second; - unsigned int length = 14; - if (option->hasLongOption()) - length += 2 + strlen(option->name); - if (option->argument != ArgumentNone) - length += 1 + strlen(option->argumentName); - if (option->argument == ArgumentOptional) - length += 2; - if (option->isArray) - length += 4; - - if (length > indent) - indent = length; - - if (option->keyValueParser) { - length = option->keyValueParser->maxOptionLength(); - if (length > indent) - indent = length; - } - } - - indent = (indent + 7) / 8 * 8; - - std::cerr << "Options:" << std::endl; - - std::ios_base::fmtflags f(std::cerr.flags()); - std::cerr << std::left; - - usageOptions(options_, indent); - - std::cerr.flags(f); -} - -void OptionsParser::usageOptions(const std::list<Option> &options, - unsigned int indent) -{ - std::vector<const Option *> parentOptions; - - for (const Option &option : options) { - std::string argument; - if (option.hasShortOption()) - argument = std::string(" -") - + static_cast<char>(option.opt); - else - argument = " "; - - if (option.hasLongOption()) { - if (option.hasShortOption()) - argument += ", "; - else - argument += " "; - argument += std::string("--") + option.name; - } - - if (option.argument != ArgumentNone) { - if (option.argument == ArgumentOptional) - argument += "[="; - else - argument += " "; - argument += option.argumentName; - if (option.argument == ArgumentOptional) - argument += "]"; - } - - if (option.isArray) - argument += " ..."; - - std::cerr << std::setw(indent) << argument; - - for (const char *help = option.help, *end = help; end; ) { - end = strchr(help, '\n'); - if (end) { - std::cerr << std::string(help, end - help + 1); - std::cerr << std::setw(indent) << " "; - help = end + 1; - } else { - std::cerr << help << std::endl; - } - } - - if (option.keyValueParser) - option.keyValueParser->usage(indent); - - if (!option.children.empty()) - parentOptions.push_back(&option); - } - - if (parentOptions.empty()) - return; - - for (const Option *option : parentOptions) { - std::cerr << std::endl << "Options valid in the context of " - << option->optionName() << ":" << std::endl; - usageOptions(option->children, indent); - } -} - -std::tuple<OptionsParser::Options *, const Option *> -OptionsParser::childOption(const Option *parent, Options *options) -{ - /* - * The parent argument points to the parent of the leaf node Option, - * and the options argument to the root node of the Options tree. Use - * recursive calls to traverse the Option tree up to the root node while - * traversing the Options tree down to the leaf node: - */ - - /* - * - If we have no parent, we've reached the root node of the Option - * tree, the options argument is what we need. - */ - if (!parent) - return { options, nullptr }; - - /* - * - If the parent has a parent, use recursion to move one level up the - * Option tree. This returns the Options corresponding to parent, or - * nullptr if a suitable Options child isn't found. - */ - if (parent->parent) { - const Option *error; - std::tie(options, error) = childOption(parent->parent, options); - - /* Propagate the error all the way back up the call stack. */ - if (!error) - return { options, error }; - } - - /* - * - The parent has no parent, we're now one level down the root. - * Return the Options child corresponding to the parent. The child may - * not exist if options are specified in an incorrect order. - */ - if (!options->isSet(parent->opt)) - return { nullptr, parent }; - - /* - * If the child value is of array type, children are not stored in the - * value .children() list, but in the .children() of the value's array - * elements. Use the last array element in that case, as a child option - * relates to the last instance of its parent option. - */ - const OptionValue *value = &(*options)[parent->opt]; - if (value->type() == OptionValue::ValueArray) - value = &value->toArray().back(); - - return { const_cast<Options *>(&value->children()), nullptr }; -} - -bool OptionsParser::parseValue(const Option &option, const char *arg, - Options *options) -{ - const Option *error; - - std::tie(options, error) = childOption(option.parent, options); - if (error) { - std::cerr << "Option " << option.optionName() << " requires a " - << error->optionName() << " context" << std::endl; - return false; - } - - if (!options->parseValue(option.opt, option, arg)) { - std::cerr << "Can't parse " << option.typeName() - << " argument for option " << option.optionName() - << std::endl; - return false; - } - - return true; -} |