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<?php

/**

 * ConsoleOptionParser file

 *

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @since         CakePHP(tm) v 2.0

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('TaskCollection', 'Console');

App::uses('ConsoleOutput', 'Console');

App::uses('ConsoleInput', 'Console');

App::uses('ConsoleInputSubcommand', 'Console');

App::uses('ConsoleInputOption', 'Console');

App::uses('ConsoleInputArgument', 'Console');

App::uses('ConsoleOptionParser', 'Console');

App::uses('HelpFormatter', 'Console');

/**

 * Handles parsing the ARGV in the command line and provides support

 * for GetOpt compatible option definition. Provides a builder pattern implementation

 * for creating shell option parsers.

 *

 * ### Options

 *

 * Named arguments come in two forms, long and short. Long arguments are preceded

 * by two - and give a more verbose option name. i.e. `--version`. Short arguments are

 * preceded by one - and are only one character long. They usually match with a long option,

 * and provide a more terse alternative.

 *

 * ### Using Options

 *

 * Options can be defined with both long and short forms. By using `$parser->addOption()`

 * you can define new options. The name of the option is used as its long form, and you

 * can supply an additional short form, with the `short` option. Short options should

 * only be one letter long. Using more than one letter for a short option will raise an exception.

 *

 * Calling options can be done using syntax similar to most *nix command line tools. Long options

 * cane either include an `=` or leave it out.

 *

 * `cake myshell command --connection default --name=something`

 *

 * Short options can be defined signally or in groups.

 *

 * `cake myshell command -cn`

 *

 * Short options can be combined into groups as seen above. Each letter in a group

 * will be treated as a separate option. The previous example is equivalent to:

 *

 * `cake myshell command -c -n`

 *

 * Short options can also accept values:

 *

 * `cake myshell command -c default`

 *

 * ### Positional arguments

 *

 * If no positional arguments are defined, all of them will be parsed. If you define positional

 * arguments any arguments greater than those defined will cause exceptions. Additionally you can

 * declare arguments as optional, by setting the required param to false.

 *

 * `$parser->addArgument('model', array('required' => false));`

 *

 * ### Providing Help text

 *

 * By providing help text for your positional arguments and named arguments, the ConsoleOptionParser

 * can generate a help display for you. You can view the help for shells by using the `--help` or `-h` switch.

 *

 * @package       Cake.Console

 */

class ConsoleOptionParser {

/**

 * Description text - displays before options when help is generated

 *

 * @see ConsoleOptionParser::description()

 * @var string

 */

	protected $_description = null;

/**

 * Epilog text - displays after options when help is generated

 *

 * @see ConsoleOptionParser::epilog()

 * @var string

 */

	protected $_epilog = null;

/**

 * Option definitions.

 *

 * @see ConsoleOptionParser::addOption()

 * @var array

 */

	protected $_options = array();

/**

 * Map of short -> long options, generated when using addOption()

 *

 * @var string

 */

	protected $_shortOptions = array();

/**

 * Positional argument definitions.

 *

 * @see ConsoleOptionParser::addArgument()

 * @var array

 */

	protected $_args = array();

/**

 * Subcommands for this Shell.

 *

 * @see ConsoleOptionParser::addSubcommand()

 * @var array

 */

	protected $_subcommands = array();

/**

 * Command name.

 *

 * @var string

 */

	protected $_command = '';

/**

 * Construct an OptionParser so you can define its behavior

 *

 * @param string $command The command name this parser is for. The command name is used for generating help.

 * @param bool $defaultOptions Whether you want the verbose and quiet options set. Setting

 *  this to false will prevent the addition of `--verbose` & `--quiet` options.

 */

	public function __construct($command = null, $defaultOptions = true) {

		$this->command($command);

		$this->addOption('help', array(

			'short' => 'h',

			'help' => __d('cake_console', 'Display this help.'),

			'boolean' => true

		));

		if ($defaultOptions) {

			$this->addOption('verbose', array(

				'short' => 'v',

				'help' => __d('cake_console', 'Enable verbose output.'),

				'boolean' => true

			))->addOption('quiet', array(

				'short' => 'q',

				'help' => __d('cake_console', 'Enable quiet output.'),

				'boolean' => true

			));

		}

	}

/**

 * Static factory method for creating new OptionParsers so you can chain methods off of them.

 *

 * @param string $command The command name this parser is for. The command name is used for generating help.

 * @param bool $defaultOptions Whether you want the verbose and quiet options set.

 * @return ConsoleOptionParser

 */

	public static function create($command, $defaultOptions = true) {

		return new ConsoleOptionParser($command, $defaultOptions);

	}

/**

 * Build a parser from an array. Uses an array like

 *

 * ```

 * $spec = array(

 *		'description' => 'text',

 *		'epilog' => 'text',

 *		'arguments' => array(

 *			// list of arguments compatible with addArguments.

 *		),

 *		'options' => array(

 *			// list of options compatible with addOptions

 *		),

 *		'subcommands' => array(

 *			// list of subcommands to add.

 *		)

 * );

 * ```

 *

 * @param array $spec The spec to build the OptionParser with.

 * @return ConsoleOptionParser

 */

	public static function buildFromArray($spec) {

		$parser = new ConsoleOptionParser($spec['command']);

		if (!empty($spec['arguments'])) {

			$parser->addArguments($spec['arguments']);

		}

		if (!empty($spec['options'])) {

			$parser->addOptions($spec['options']);

		}

		if (!empty($spec['subcommands'])) {

			$parser->addSubcommands($spec['subcommands']);

		}

		if (!empty($spec['description'])) {

			$parser->description($spec['description']);

		}

		if (!empty($spec['epilog'])) {

			$parser->epilog($spec['epilog']);

		}

		return $parser;

	}

/**

 * Get or set the command name for shell/task.

 *

 * @param string $text The text to set, or null if you want to read

 * @return string|$this If reading, the value of the command. If setting $this will be returned.

 */

	public function command($text = null) {

		if ($text !== null) {

			$this->_command = Inflector::underscore($text);

			return $this;

		}

		return $this->_command;

	}

/**

 * Get or set the description text for shell/task.

 *

 * @param string|array $text The text to set, or null if you want to read. If an array the

 *   text will be imploded with "\n"

 * @return string|$this If reading, the value of the description. If setting $this will be returned.

 */

	public function description($text = null) {

		if ($text !== null) {

			if (is_array($text)) {

				$text = implode("\n", $text);

			}

			$this->_description = $text;

			return $this;

		}

		return $this->_description;

	}

/**

 * Get or set an epilog to the parser. The epilog is added to the end of

 * the options and arguments listing when help is generated.

 *

 * @param string|array $text Text when setting or null when reading. If an array the text will be imploded with "\n"

 * @return string|$this If reading, the value of the epilog. If setting $this will be returned.

 */

	public function epilog($text = null) {

		if ($text !== null) {

			if (is_array($text)) {

				$text = implode("\n", $text);

			}

			$this->_epilog = $text;

			return $this;

		}

		return $this->_epilog;

	}

/**

 * Add an option to the option parser. Options allow you to define optional or required

 * parameters for your console application. Options are defined by the parameters they use.

 *

 * ### Options

 *

 * - `short` - The single letter variant for this option, leave undefined for none.

 * - `help` - Help text for this option. Used when generating help for the option.

 * - `default` - The default value for this option. Defaults are added into the parsed params when the

 *    attached option is not provided or has no value. Using default and boolean together will not work.

 *    are added into the parsed parameters when the option is undefined. Defaults to null.

 * - `boolean` - The option uses no value, its just a boolean switch. Defaults to false.

 *    If an option is defined as boolean, it will always be added to the parsed params. If no present

 *    it will be false, if present it will be true.

 * - `choices` A list of valid choices for this option. If left empty all values are valid..

 *   An exception will be raised when parse() encounters an invalid value.

 *

 * @param ConsoleInputOption|string $name The long name you want to the value to be parsed out as when options are parsed.

 *   Will also accept an instance of ConsoleInputOption

 * @param array $options An array of parameters that define the behavior of the option

 * @return $this

 */

	public function addOption($name, $options = array()) {

		if (is_object($name) && $name instanceof ConsoleInputOption) {

			$option = $name;

			$name = $option->name();

		} else {

			$defaults = array(

				'name' => $name,

				'short' => null,

				'help' => '',

				'default' => null,

				'boolean' => false,

				'choices' => array()

			);

			$options += $defaults;

			$option = new ConsoleInputOption($options);

		}

		$this->_options[$name] = $option;

		if ($option->short() !== null) {

			$this->_shortOptions[$option->short()] = $name;

		}

		return $this;

	}

/**

 * Add a positional argument to the option parser.

 *

 * ### Params

 *

 * - `help` The help text to display for this argument.

 * - `required` Whether this parameter is required.

 * - `index` The index for the arg, if left undefined the argument will be put

 *   onto the end of the arguments. If you define the same index twice the first

 *   option will be overwritten.

 * - `choices` A list of valid choices for this argument. If left empty all values are valid..

 *   An exception will be raised when parse() encounters an invalid value.

 *

 * @param ConsoleInputArgument|string $name The name of the argument. Will also accept an instance of ConsoleInputArgument

 * @param array $params Parameters for the argument, see above.

 * @return $this

 */

	public function addArgument($name, $params = array()) {

		if (is_object($name) && $name instanceof ConsoleInputArgument) {

			$arg = $name;

			$index = count($this->_args);

		} else {

			$defaults = array(

				'name' => $name,

				'help' => '',

				'index' => count($this->_args),

				'required' => false,

				'choices' => array()

			);

			$options = $params + $defaults;

			$index = $options['index'];

			unset($options['index']);

			$arg = new ConsoleInputArgument($options);

		}

		$this->_args[$index] = $arg;

		ksort($this->_args);

		return $this;

	}

/**

 * Add multiple arguments at once. Take an array of argument definitions.

 * The keys are used as the argument names, and the values as params for the argument.

 *

 * @param array $args Array of arguments to add.

 * @see ConsoleOptionParser::addArgument()

 * @return $this

 */

	public function addArguments(array $args) {

		foreach ($args as $name => $params) {

			$this->addArgument($name, $params);

		}

		return $this;

	}

/**

 * Add multiple options at once. Takes an array of option definitions.

 * The keys are used as option names, and the values as params for the option.

 *

 * @param array $options Array of options to add.

 * @see ConsoleOptionParser::addOption()

 * @return $this

 */

	public function addOptions(array $options) {

		foreach ($options as $name => $params) {

			$this->addOption($name, $params);

		}

		return $this;

	}

/**

 * Append a subcommand to the subcommand list.

 * Subcommands are usually methods on your Shell, but can also be used to document Tasks.

 *

 * ### Options

 *

 * - `help` - Help text for the subcommand.

 * - `parser` - A ConsoleOptionParser for the subcommand. This allows you to create method

 *    specific option parsers. When help is generated for a subcommand, if a parser is present

 *    it will be used.

 *

 * @param ConsoleInputSubcommand|string $name Name of the subcommand. Will also accept an instance of ConsoleInputSubcommand

 * @param array $options Array of params, see above.

 * @return $this

 */

	public function addSubcommand($name, $options = array()) {

		if (is_object($name) && $name instanceof ConsoleInputSubcommand) {

			$command = $name;

			$name = $command->name();

		} else {

			$defaults = array(

				'name' => $name,

				'help' => '',

				'parser' => null

			);

			$options += $defaults;

			$command = new ConsoleInputSubcommand($options);

		}

		$this->_subcommands[$name] = $command;

		return $this;

	}

/**

 * Remove a subcommand from the option parser.

 *

 * @param string $name The subcommand name to remove.

 * @return $this

 */

	public function removeSubcommand($name) {

		unset($this->_subcommands[$name]);

		return $this;

	}

/**

 * Add multiple subcommands at once.

 *

 * @param array $commands Array of subcommands.

 * @return $this

 */

	public function addSubcommands(array $commands) {

		foreach ($commands as $name => $params) {

			$this->addSubcommand($name, $params);

		}

		return $this;

	}

/**

 * Gets the arguments defined in the parser.

 *

 * @return array Array of argument descriptions

 */

	public function arguments() {

		return $this->_args;

	}

/**

 * Get the defined options in the parser.

 *

 * @return array

 */

	public function options() {

		return $this->_options;

	}

/**

 * Get the array of defined subcommands

 *

 * @return array

 */

	public function subcommands() {

		return $this->_subcommands;

	}

/**

 * Parse the argv array into a set of params and args. If $command is not null

 * and $command is equal to a subcommand that has a parser, that parser will be used

 * to parse the $argv

 *

 * @param array $argv Array of args (argv) to parse.

 * @param string $command The subcommand to use. If this parameter is a subcommand, that has a parser,

 *    That parser will be used to parse $argv instead.

 * @return Array array($params, $args)

 * @throws ConsoleException When an invalid parameter is encountered.

 */

	public function parse($argv, $command = null) {

		if (isset($this->_subcommands[$command]) && $this->_subcommands[$command]->parser()) {

			return $this->_subcommands[$command]->parser()->parse($argv);

		}

		$params = $args = array();

		$this->_tokens = $argv;

		while (($token = array_shift($this->_tokens)) !== null) {

			if (substr($token, 0, 2) === '--') {

				$params = $this->_parseLongOption($token, $params);

			} elseif (substr($token, 0, 1) === '-') {

				$params = $this->_parseShortOption($token, $params);

			} else {

				$args = $this->_parseArg($token, $args);

			}

		}

		foreach ($this->_args as $i => $arg) {

			if ($arg->isRequired() && !isset($args[$i]) && empty($params['help'])) {

				throw new ConsoleException(

					__d('cake_console', 'Missing required arguments. %s is required.', $arg->name())

				);

			}

		}

		foreach ($this->_options as $option) {

			$name = $option->name();

			$isBoolean = $option->isBoolean();

			$default = $option->defaultValue();

			if ($default !== null && !isset($params[$name]) && !$isBoolean) {

				$params[$name] = $default;

			}

			if ($isBoolean && !isset($params[$name])) {

				$params[$name] = false;

			}

		}

		return array($params, $args);

	}

/**

 * Gets formatted help for this parser object.

 * Generates help text based on the description, options, arguments, subcommands and epilog

 * in the parser.

 *

 * @param string $subcommand If present and a valid subcommand that has a linked parser.

 *    That subcommands help will be shown instead.

 * @param string $format Define the output format, can be text or xml

 * @param int $width The width to format user content to. Defaults to 72

 * @return string Generated help.

 */

	public function help($subcommand = null, $format = 'text', $width = 72) {

		if (isset($this->_subcommands[$subcommand]) &&

			$this->_subcommands[$subcommand]->parser() instanceof self

		) {

			$subparser = $this->_subcommands[$subcommand]->parser();

			$subparser->command($this->command() . ' ' . $subparser->command());

			return $subparser->help(null, $format, $width);

		}

		$formatter = new HelpFormatter($this);

		if ($format === 'text' || $format === true) {

			return $formatter->text($width);

		} elseif ($format === 'xml') {

			return $formatter->xml();

		}

	}

/**

 * Parse the value for a long option out of $this->_tokens. Will handle

 * options with an `=` in them.

 *

 * @param string $option The option to parse.

 * @param array $params The params to append the parsed value into

 * @return array Params with $option added in.

 */

	protected function _parseLongOption($option, $params) {

		$name = substr($option, 2);

		if (strpos($name, '=') !== false) {

			list($name, $value) = explode('=', $name, 2);

			array_unshift($this->_tokens, $value);

		}

		return $this->_parseOption($name, $params);

	}

/**

 * Parse the value for a short option out of $this->_tokens

 * If the $option is a combination of multiple shortcuts like -otf

 * they will be shifted onto the token stack and parsed individually.

 *

 * @param string $option The option to parse.

 * @param array $params The params to append the parsed value into

 * @return array Params with $option added in.

 * @throws ConsoleException When unknown short options are encountered.

 */

	protected function _parseShortOption($option, $params) {

		$key = substr($option, 1);

		if (strlen($key) > 1) {

			$flags = str_split($key);

			$key = $flags[0];

			for ($i = 1, $len = count($flags); $i < $len; $i++) {

				array_unshift($this->_tokens, '-' . $flags[$i]);

			}

		}

		if (!isset($this->_shortOptions[$key])) {

			throw new ConsoleException(__d('cake_console', 'Unknown short option `%s`', $key));

		}

		$name = $this->_shortOptions[$key];

		return $this->_parseOption($name, $params);

	}

/**

 * Parse an option by its name index.

 *

 * @param string $name The name to parse.

 * @param array $params The params to append the parsed value into

 * @return array Params with $option added in.

 * @throws ConsoleException

 */

	protected function _parseOption($name, $params) {

		if (!isset($this->_options[$name])) {

			throw new ConsoleException(__d('cake_console', 'Unknown option `%s`', $name));

		}

		$option = $this->_options[$name];

		$isBoolean = $option->isBoolean();

		$nextValue = $this->_nextToken();

		$emptyNextValue = (empty($nextValue) && $nextValue !== '0');

		if (!$isBoolean && !$emptyNextValue && !$this->_optionExists($nextValue)) {

			array_shift($this->_tokens);

			$value = $nextValue;

		} elseif ($isBoolean) {

			$value = true;

		} else {

			$value = $option->defaultValue();

		}

		if ($option->validChoice($value)) {

			$params[$name] = $value;

			return $params;

		}

		return array();

	}

/**

 * Check to see if $name has an option (short/long) defined for it.

 *

 * @param string $name The name of the option.

 * @return bool

 */

	protected function _optionExists($name) {

		if (substr($name, 0, 2) === '--') {

			return isset($this->_options[substr($name, 2)]);

		}

		if ($name{0} === '-' && $name{1} !== '-') {

			return isset($this->_shortOptions[$name{1}]);

		}

		return false;

	}

/**

 * Parse an argument, and ensure that the argument doesn't exceed the number of arguments

 * and that the argument is a valid choice.

 *

 * @param string $argument The argument to append

 * @param array $args The array of parsed args to append to.

 * @return array Args

 * @throws ConsoleException

 */

	protected function _parseArg($argument, $args) {

		if (empty($this->_args)) {

			$args[] = $argument;

			return $args;

		}

		$next = count($args);

		if (!isset($this->_args[$next])) {

			throw new ConsoleException(__d('cake_console', 'Too many arguments.'));

		}

		if ($this->_args[$next]->validChoice($argument)) {

			$args[] = $argument;

			return $args;

		}

	}

/**

 * Find the next token in the argv set.

 *

 * @return string next token or ''

 */

	protected function _nextToken() {

		return isset($this->_tokens[0]) ? $this->_tokens[0] : '';

	}

}