mirror of
https://github.com/silverstripe/silverstripe-docsviewer
synced 2024-10-22 11:05:56 +02:00
448 lines
14 KiB
PHP
Executable File
448 lines
14 KiB
PHP
Executable File
<?php
|
|
/**
|
|
* Zend Framework
|
|
*
|
|
* LICENSE
|
|
*
|
|
* This source file is subject to the new BSD license that is bundled
|
|
* with this package in the file LICENSE.txt.
|
|
* It is also available through the world-wide-web at this URL:
|
|
* http://framework.zend.com/license/new-bsd
|
|
* If you did not receive a copy of the license and are unable to
|
|
* obtain it through the world-wide-web, please send an email
|
|
* to license@zend.com so we can send you a copy immediately.
|
|
*
|
|
* @category Zend
|
|
* @package Zend_Search_Lucene
|
|
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
|
|
* @license http://framework.zend.com/license/new-bsd New BSD License
|
|
* @version $Id: FSM.php 20096 2010-01-06 02:05:09Z bkarwin $
|
|
*/
|
|
|
|
/**
|
|
* Zend_Search_Lucene_FSMAction
|
|
*/
|
|
require_once 'Zend/Search/Lucene/FSMAction.php';
|
|
|
|
/**
|
|
* Abstract Finite State Machine
|
|
*
|
|
* Take a look on Wikipedia state machine description: http://en.wikipedia.org/wiki/Finite_state_machine
|
|
*
|
|
* Any type of Transducers (Moore machine or Mealy machine) also may be implemented by using this abstract FSM.
|
|
* process() methods invokes a specified actions which may construct FSM output.
|
|
* Actions may be also used to signal, that we have reached Accept State
|
|
*
|
|
* @category Zend
|
|
* @package Zend_Search_Lucene
|
|
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
|
|
* @license http://framework.zend.com/license/new-bsd New BSD License
|
|
*/
|
|
abstract class Zend_Search_Lucene_FSM
|
|
{
|
|
/**
|
|
* Machine States alphabet
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_states = array();
|
|
|
|
/**
|
|
* Current state
|
|
*
|
|
* @var integer|string
|
|
*/
|
|
private $_currentState = null;
|
|
|
|
/**
|
|
* Input alphabet
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_inputAphabet = array();
|
|
|
|
/**
|
|
* State transition table
|
|
*
|
|
* [sourceState][input] => targetState
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_rules = array();
|
|
|
|
/**
|
|
* List of entry actions
|
|
* Each action executes when entering the state
|
|
*
|
|
* [state] => action
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_entryActions = array();
|
|
|
|
/**
|
|
* List of exit actions
|
|
* Each action executes when exiting the state
|
|
*
|
|
* [state] => action
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_exitActions = array();
|
|
|
|
/**
|
|
* List of input actions
|
|
* Each action executes when entering the state
|
|
*
|
|
* [state][input] => action
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_inputActions = array();
|
|
|
|
/**
|
|
* List of input actions
|
|
* Each action executes when entering the state
|
|
*
|
|
* [state1][state2] => action
|
|
*
|
|
* @var array
|
|
*/
|
|
private $_transitionActions = array();
|
|
|
|
/**
|
|
* Finite State machine constructor
|
|
*
|
|
* $states is an array of integers or strings with a list of possible machine states
|
|
* constructor treats fist list element as a sturt state (assignes it to $_current state).
|
|
* It may be reassigned by setState() call.
|
|
* States list may be empty and can be extended later by addState() or addStates() calls.
|
|
*
|
|
* $inputAphabet is the same as $states, but represents input alphabet
|
|
* it also may be extended later by addInputSymbols() or addInputSymbol() calls.
|
|
*
|
|
* $rules parameter describes FSM transitions and has a structure:
|
|
* array( array(sourseState, input, targetState[, inputAction]),
|
|
* array(sourseState, input, targetState[, inputAction]),
|
|
* array(sourseState, input, targetState[, inputAction]),
|
|
* ...
|
|
* )
|
|
* Rules also can be added later by addRules() and addRule() calls.
|
|
*
|
|
* FSM actions are very flexible and may be defined by addEntryAction(), addExitAction(),
|
|
* addInputAction() and addTransitionAction() calls.
|
|
*
|
|
* @param array $states
|
|
* @param array $inputAphabet
|
|
* @param array $rules
|
|
*/
|
|
public function __construct($states = array(), $inputAphabet = array(), $rules = array())
|
|
{
|
|
$this->addStates($states);
|
|
$this->addInputSymbols($inputAphabet);
|
|
$this->addRules($rules);
|
|
}
|
|
|
|
/**
|
|
* Add states to the state machine
|
|
*
|
|
* @param array $states
|
|
*/
|
|
public function addStates($states)
|
|
{
|
|
foreach ($states as $state) {
|
|
$this->addState($state);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add state to the state machine
|
|
*
|
|
* @param integer|string $state
|
|
*/
|
|
public function addState($state)
|
|
{
|
|
$this->_states[$state] = $state;
|
|
|
|
if ($this->_currentState === null) {
|
|
$this->_currentState = $state;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set FSM state.
|
|
* No any action is invoked
|
|
*
|
|
* @param integer|string $state
|
|
* @throws Zend_Search_Exception
|
|
*/
|
|
public function setState($state)
|
|
{
|
|
if (!isset($this->_states[$state])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('State \'' . $state . '\' is not on of the possible FSM states.');
|
|
}
|
|
|
|
$this->_currentState = $state;
|
|
}
|
|
|
|
/**
|
|
* Get FSM state.
|
|
*
|
|
* @return integer|string $state|null
|
|
*/
|
|
public function getState()
|
|
{
|
|
return $this->_currentState;
|
|
}
|
|
|
|
/**
|
|
* Add symbols to the input alphabet
|
|
*
|
|
* @param array $inputAphabet
|
|
*/
|
|
public function addInputSymbols($inputAphabet)
|
|
{
|
|
foreach ($inputAphabet as $inputSymbol) {
|
|
$this->addInputSymbol($inputSymbol);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add symbol to the input alphabet
|
|
*
|
|
* @param integer|string $inputSymbol
|
|
*/
|
|
public function addInputSymbol($inputSymbol)
|
|
{
|
|
$this->_inputAphabet[$inputSymbol] = $inputSymbol;
|
|
}
|
|
|
|
|
|
/**
|
|
* Add transition rules
|
|
*
|
|
* array structure:
|
|
* array( array(sourseState, input, targetState[, inputAction]),
|
|
* array(sourseState, input, targetState[, inputAction]),
|
|
* array(sourseState, input, targetState[, inputAction]),
|
|
* ...
|
|
* )
|
|
*
|
|
* @param array $rules
|
|
*/
|
|
public function addRules($rules)
|
|
{
|
|
foreach ($rules as $rule) {
|
|
$this->addrule($rule[0], $rule[1], $rule[2], isset($rule[3])?$rule[3]:null);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add symbol to the input alphabet
|
|
*
|
|
* @param integer|string $sourceState
|
|
* @param integer|string $input
|
|
* @param integer|string $targetState
|
|
* @param Zend_Search_Lucene_FSMAction|null $inputAction
|
|
* @throws Zend_Search_Exception
|
|
*/
|
|
public function addRule($sourceState, $input, $targetState, $inputAction = null)
|
|
{
|
|
if (!isset($this->_states[$sourceState])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined source state (' . $sourceState . ').');
|
|
}
|
|
if (!isset($this->_states[$targetState])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined target state (' . $targetState . ').');
|
|
}
|
|
if (!isset($this->_inputAphabet[$input])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined input symbol (' . $input . ').');
|
|
}
|
|
|
|
if (!isset($this->_rules[$sourceState])) {
|
|
$this->_rules[$sourceState] = array();
|
|
}
|
|
if (isset($this->_rules[$sourceState][$input])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Rule for {state,input} pair (' . $sourceState . ', '. $input . ') is already defined.');
|
|
}
|
|
|
|
$this->_rules[$sourceState][$input] = $targetState;
|
|
|
|
|
|
if ($inputAction !== null) {
|
|
$this->addInputAction($sourceState, $input, $inputAction);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Add state entry action.
|
|
* Several entry actions are allowed.
|
|
* Action execution order is defined by addEntryAction() calls
|
|
*
|
|
* @param integer|string $state
|
|
* @param Zend_Search_Lucene_FSMAction $action
|
|
*/
|
|
public function addEntryAction($state, Zend_Search_Lucene_FSMAction $action)
|
|
{
|
|
if (!isset($this->_states[$state])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined state (' . $state. ').');
|
|
}
|
|
|
|
if (!isset($this->_entryActions[$state])) {
|
|
$this->_entryActions[$state] = array();
|
|
}
|
|
|
|
$this->_entryActions[$state][] = $action;
|
|
}
|
|
|
|
/**
|
|
* Add state exit action.
|
|
* Several exit actions are allowed.
|
|
* Action execution order is defined by addEntryAction() calls
|
|
*
|
|
* @param integer|string $state
|
|
* @param Zend_Search_Lucene_FSMAction $action
|
|
*/
|
|
public function addExitAction($state, Zend_Search_Lucene_FSMAction $action)
|
|
{
|
|
if (!isset($this->_states[$state])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined state (' . $state. ').');
|
|
}
|
|
|
|
if (!isset($this->_exitActions[$state])) {
|
|
$this->_exitActions[$state] = array();
|
|
}
|
|
|
|
$this->_exitActions[$state][] = $action;
|
|
}
|
|
|
|
/**
|
|
* Add input action (defined by {state, input} pair).
|
|
* Several input actions are allowed.
|
|
* Action execution order is defined by addInputAction() calls
|
|
*
|
|
* @param integer|string $state
|
|
* @param integer|string $input
|
|
* @param Zend_Search_Lucene_FSMAction $action
|
|
*/
|
|
public function addInputAction($state, $inputSymbol, Zend_Search_Lucene_FSMAction $action)
|
|
{
|
|
if (!isset($this->_states[$state])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined state (' . $state. ').');
|
|
}
|
|
if (!isset($this->_inputAphabet[$inputSymbol])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined input symbol (' . $inputSymbol. ').');
|
|
}
|
|
|
|
if (!isset($this->_inputActions[$state])) {
|
|
$this->_inputActions[$state] = array();
|
|
}
|
|
if (!isset($this->_inputActions[$state][$inputSymbol])) {
|
|
$this->_inputActions[$state][$inputSymbol] = array();
|
|
}
|
|
|
|
$this->_inputActions[$state][$inputSymbol][] = $action;
|
|
}
|
|
|
|
/**
|
|
* Add transition action (defined by {state, input} pair).
|
|
* Several transition actions are allowed.
|
|
* Action execution order is defined by addTransitionAction() calls
|
|
*
|
|
* @param integer|string $sourceState
|
|
* @param integer|string $targetState
|
|
* @param Zend_Search_Lucene_FSMAction $action
|
|
*/
|
|
public function addTransitionAction($sourceState, $targetState, Zend_Search_Lucene_FSMAction $action)
|
|
{
|
|
if (!isset($this->_states[$sourceState])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined source state (' . $sourceState. ').');
|
|
}
|
|
if (!isset($this->_states[$targetState])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('Undefined source state (' . $targetState. ').');
|
|
}
|
|
|
|
if (!isset($this->_transitionActions[$sourceState])) {
|
|
$this->_transitionActions[$sourceState] = array();
|
|
}
|
|
if (!isset($this->_transitionActions[$sourceState][$targetState])) {
|
|
$this->_transitionActions[$sourceState][$targetState] = array();
|
|
}
|
|
|
|
$this->_transitionActions[$sourceState][$targetState][] = $action;
|
|
}
|
|
|
|
|
|
/**
|
|
* Process an input
|
|
*
|
|
* @param mixed $input
|
|
* @throws Zend_Search_Exception
|
|
*/
|
|
public function process($input)
|
|
{
|
|
if (!isset($this->_rules[$this->_currentState])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('There is no any rule for current state (' . $this->_currentState . ').');
|
|
}
|
|
if (!isset($this->_rules[$this->_currentState][$input])) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('There is no any rule for {current state, input} pair (' . $this->_currentState . ', ' . $input . ').');
|
|
}
|
|
|
|
$sourceState = $this->_currentState;
|
|
$targetState = $this->_rules[$this->_currentState][$input];
|
|
|
|
if ($sourceState != $targetState && isset($this->_exitActions[$sourceState])) {
|
|
foreach ($this->_exitActions[$sourceState] as $action) {
|
|
$action->doAction();
|
|
}
|
|
}
|
|
if (isset($this->_inputActions[$sourceState])
|
|
&& isset($this->_inputActions[$sourceState][$input])
|
|
) {
|
|
foreach ($this->_inputActions[$sourceState][$input] as $action) {
|
|
$action->doAction();
|
|
}
|
|
}
|
|
|
|
|
|
$this->_currentState = $targetState;
|
|
|
|
if (isset($this->_transitionActions[$sourceState])
|
|
&& isset($this->_transitionActions[$sourceState][$targetState])
|
|
) {
|
|
foreach ($this->_transitionActions[$sourceState][$targetState] as $action) {
|
|
$action->doAction();
|
|
}
|
|
}
|
|
if ($sourceState != $targetState && isset($this->_entryActions[$targetState])) {
|
|
foreach ($this->_entryActions[$targetState] as $action) {
|
|
$action->doAction();
|
|
}
|
|
}
|
|
}
|
|
|
|
public function reset()
|
|
{
|
|
if (count($this->_states) == 0) {
|
|
include_once 'Zend/Search/Exception.php';
|
|
throw new Zend_Search_Exception('There is no any state defined for FSM.');
|
|
}
|
|
|
|
$this->_currentState = $this->_states[0];
|
|
}
|
|
}
|
|
|