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<?php
/**
* Helper class to keep track of options when mixing links and form elements.
*
* Copyright © 2008, Niklas Laxström
* Copyright © 2011, Antoine Musso
* Copyright © 2013, Bartosz Dziewoński
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Niklas Laxström
* @author Antoine Musso
*/
/**
* Helper class to keep track of options when mixing links and form elements.
*
* @todo This badly needs some examples and tests :) The usage in SpecialRecentchanges class is a
* good ersatz in the meantime.
*/
class FormOptions implements ArrayAccess {
/** @name Type constants
* Used internally to map an option value to a WebRequest accessor
*/
/* @{ */
/** Mark value for automatic detection (for simple data types only) */
const AUTO = -1;
/** String type, maps guessType() to WebRequest::getText() */
const STRING = 0;
/** Integer type, maps guessType() to WebRequest::getInt() */
const INT = 1;
/** Float type, maps guessType() to WebRequest::getFloat()
* @since 1.23 */
const FLOAT = 4;
/** Boolean type, maps guessType() to WebRequest::getBool() */
const BOOL = 2;
/** Integer type or null, maps to WebRequest::getIntOrNull()
* This is useful for the namespace selector.
*/
const INTNULL = 3;
/* @} */
/**
* Map of known option names to information about them.
*
* Each value is an array with the following keys:
* - 'default' - the default value as passed to add()
* - 'value' - current value, start with null, can be set by various functions
* - 'consumed' - true/false, whether the option was consumed using
* consumeValue() or consumeValues()
* - 'type' - one of the type constants (but never AUTO)
*/
protected $options = [];
# Setting up
/**
* Add an option to be handled by this FormOptions instance.
*
* @param string $name Request parameter name
* @param mixed $default Default value when the request parameter is not present
* @param int $type One of the type constants (optional, defaults to AUTO)
*/
public function add( $name, $default, $type = self::AUTO ) {
$option = [];
$option['default'] = $default;
$option['value'] = null;
$option['consumed'] = false;
if ( $type !== self::AUTO ) {
$option['type'] = $type;
} else {
$option['type'] = self::guessType( $default );
}
$this->options[$name] = $option;
}
/**
* Remove an option being handled by this FormOptions instance. This is the inverse of add().
*
* @param string $name Request parameter name
*/
public function delete( $name ) {
$this->validateName( $name, true );
unset( $this->options[$name] );
}
/**
* Used to find out which type the data is. All types are defined in the 'Type constants' section
* of this class.
*
* Detection of the INTNULL type is not supported; INT will be assumed if the data is an integer,
* MWException will be thrown if it's null.
*
* @param mixed $data Value to guess the type for
* @throws MWException If unable to guess the type
* @return int Type constant
*/
public static function guessType( $data ) {
if ( is_bool( $data ) ) {
return self::BOOL;
} elseif ( is_int( $data ) ) {
return self::INT;
} elseif ( is_float( $data ) ) {
return self::FLOAT;
} elseif ( is_string( $data ) ) {
return self::STRING;
} else {
throw new MWException( 'Unsupported datatype' );
}
}
# Handling values
/**
* Verify that the given option name exists.
*
* @param string $name Option name
* @param bool $strict Throw an exception when the option doesn't exist instead of returning false
* @throws MWException
* @return bool True if the option exists, false otherwise
*/
public function validateName( $name, $strict = false ) {
if ( !isset( $this->options[$name] ) ) {
if ( $strict ) {
throw new MWException( "Invalid option $name" );
} else {
return false;
}
}
return true;
}
/**
* Use to set the value of an option.
*
* @param string $name Option name
* @param mixed $value Value for the option
* @param bool $force Whether to set the value when it is equivalent to the default value for this
* option (default false).
*/
public function setValue( $name, $value, $force = false ) {
$this->validateName( $name, true );
if ( !$force && $value === $this->options[$name]['default'] ) {
// null default values as unchanged
$this->options[$name]['value'] = null;
} else {
$this->options[$name]['value'] = $value;
}
}
/**
* Get the value for the given option name. Uses getValueReal() internally.
*
* @param string $name Option name
* @return mixed
*/
public function getValue( $name ) {
$this->validateName( $name, true );
return $this->getValueReal( $this->options[$name] );
}
/**
* Return current option value, based on a structure taken from $options.
*
* @param array $option Array structure describing the option
* @return mixed Value, or the default value if it is null
*/
protected function getValueReal( $option ) {
if ( $option['value'] !== null ) {
return $option['value'];
} else {
return $option['default'];
}
}
/**
* Delete the option value.
* This will make future calls to getValue() return the default value.
* @param string $name Option name
*/
public function reset( $name ) {
$this->validateName( $name, true );
$this->options[$name]['value'] = null;
}
/**
* Get the value of given option and mark it as 'consumed'. Consumed options are not returned
* by getUnconsumedValues().
*
* @see consumeValues()
* @throws MWException If the option does not exist
* @param string $name Option name
* @return mixed Value, or the default value if it is null
*/
public function consumeValue( $name ) {
$this->validateName( $name, true );
$this->options[$name]['consumed'] = true;
return $this->getValueReal( $this->options[$name] );
}
/**
* Get the values of given options and mark them as 'consumed'. Consumed options are not returned
* by getUnconsumedValues().
*
* @see consumeValue()
* @throws MWException If any option does not exist
* @param array $names Array of option names as strings
* @return array Array of option values, or the default values if they are null
*/
public function consumeValues( $names ) {
$out = [];
foreach ( $names as $name ) {
$this->validateName( $name, true );
$this->options[$name]['consumed'] = true;
$out[] = $this->getValueReal( $this->options[$name] );
}
return $out;
}
/**
* @see validateBounds()
*/
public function validateIntBounds( $name, $min, $max ) {
$this->validateBounds( $name, $min, $max );
}
/**
* Constrain a numeric value for a given option to a given range. The value will be altered to fit
* in the range.
*
* @since 1.23
*
* @param string $name Option name
* @param int|float $min Minimum value
* @param int|float $max Maximum value
* @throws MWException If option is not of type INT
*/
public function validateBounds( $name, $min, $max ) {
$this->validateName( $name, true );
$type = $this->options[$name]['type'];
if ( $type !== self::INT && $type !== self::FLOAT ) {
throw new MWException( "Option $name is not of type INT or FLOAT" );
}
$value = $this->getValueReal( $this->options[$name] );
$value = max( $min, min( $max, $value ) );
$this->setValue( $name, $value );
}
/**
* Get all remaining values which have not been consumed by consumeValue() or consumeValues().
*
* @param bool $all Whether to include unchanged options (default: false)
* @return array
*/
public function getUnconsumedValues( $all = false ) {
$values = [];
foreach ( $this->options as $name => $data ) {
if ( !$data['consumed'] ) {
if ( $all || $data['value'] !== null ) {
$values[$name] = $this->getValueReal( $data );
}
}
}
return $values;
}
/**
* Return options modified as an array ( name => value )
* @return array
*/
public function getChangedValues() {
$values = [];
foreach ( $this->options as $name => $data ) {
if ( $data['value'] !== null ) {
$values[$name] = $data['value'];
}
}
return $values;
}
/**
* Format options to an array ( name => value )
* @return array
*/
public function getAllValues() {
$values = [];
foreach ( $this->options as $name => $data ) {
$values[$name] = $this->getValueReal( $data );
}
return $values;
}
# Reading values
/**
* Fetch values for all options (or selected options) from the given WebRequest, making them
* available for accessing with getValue() or consumeValue() etc.
*
* @param WebRequest $r The request to fetch values from
* @param array $optionKeys Which options to fetch the values for (default:
* all of them). Note that passing an empty array will also result in
* values for all keys being fetched.
* @throws MWException If the type of any option is invalid
*/
public function fetchValuesFromRequest( WebRequest $r, $optionKeys = null ) {
if ( !$optionKeys ) {
$optionKeys = array_keys( $this->options );
}
foreach ( $optionKeys as $name ) {
$default = $this->options[$name]['default'];
$type = $this->options[$name]['type'];
switch ( $type ) {
case self::BOOL:
$value = $r->getBool( $name, $default );
break;
case self::INT:
$value = $r->getInt( $name, $default );
break;
case self::FLOAT:
$value = $r->getFloat( $name, $default );
break;
case self::STRING:
$value = $r->getText( $name, $default );
break;
case self::INTNULL:
$value = $r->getIntOrNull( $name );
break;
default:
throw new MWException( 'Unsupported datatype' );
}
if ( $value !== null ) {
$this->options[$name]['value'] = $value === $default ? null : $value;
}
}
}
/** @name ArrayAccess functions
* These functions implement the ArrayAccess PHP interface.
* @see http://php.net/manual/en/class.arrayaccess.php
*/
/* @{ */
/**
* Whether the option exists.
* @param string $name
* @return bool
*/
public function offsetExists( $name ) {
return isset( $this->options[$name] );
}
/**
* Retrieve an option value.
* @param string $name
* @return mixed
*/
public function offsetGet( $name ) {
return $this->getValue( $name );
}
/**
* Set an option to given value.
* @param string $name
* @param mixed $value
*/
public function offsetSet( $name, $value ) {
$this->setValue( $name, $value );
}
/**
* Delete the option.
* @param string $name
*/
public function offsetUnset( $name ) {
$this->delete( $name );
}
/* @} */
}