src/cam/options.h


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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * options.h - cam - Options parsing
 */
#ifndef __CAM_OPTIONS_H__
#define __CAM_OPTIONS_H__

#include <ctype.h>
#include <list>
#include <map>
#include <vector>

class KeyValueParser;
class OptionValue;
struct Option;

enum OptionArgument {
	ArgumentNone,
	ArgumentRequired,
	ArgumentOptional,
};

enum OptionType {
	OptionNone,
	OptionInteger,
	OptionString,
	OptionKeyValue,
};

template<typename T>
class OptionsBase
{
public:
	OptionsBase() : valid_(false) {}

	bool empty() const;
	bool valid() const;
	bool isSet(const T &opt) const;
	const OptionValue &operator[](const T &opt) const;

	void invalidate();

private:
	friend class KeyValueParser;
	friend class OptionsParser;

	bool parseValue(const T &opt, const Option &option, const char *value);

	std::map<T, OptionValue> values_;
	bool valid_;
};

class KeyValueParser
{
public:
	class Options : public OptionsBase<std::string>
	{
	};

	KeyValueParser();
	virtual ~KeyValueParser();

	bool addOption(const char *name, OptionType type, const char *help,
		       OptionArgument argument = ArgumentNone);

	virtual Options parse(const char *arguments);

private:
	KeyValueParser(const KeyValueParser &) = delete;
	KeyValueParser &operator=(const KeyValueParser &) = delete;

	friend class OptionsParser;
	void usage(int indent);

	std::map<std::string, Option> optionsMap_;
};