Search/Lucene/FSM.php

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Category
Zend  
Copyright
Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  
Package
Zend_Search_Lucene  
Version
$Id$  

\Zend_Search_Lucene_FSM
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Package: Zend_Search_Lucene
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
Children
\Zend_Search_Lucene_Search_QueryLexer
\Zend_Search_Lucene_Search_BooleanExpressionRecognizer
\Zend_Search_Lucene_Search_QueryParser
Category
Zend  
Copyright
Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)  
License
New BSD License  

Properties

>VPropertyprivateinteger|string $_currentState = null
Current state
Default valuenullDetails
Type
integer | string
>VPropertyprivatearray $_entryActions = array()
List of entry actions Each action executes when entering the state
[state] => action
Default valuearray()Details
Type
array
>VPropertyprivatearray $_exitActions = array()
List of exit actions Each action executes when exiting the state
[state] => action
Default valuearray()Details
Type
array
>VPropertyprivatearray $_inputActions = array()
List of input actions Each action executes when entering the state
[state][input] => action
Default valuearray()Details
Type
array
>VPropertyprivatearray $_inputAphabet = array()
Input alphabet
Default valuearray()Details
Type
array
>VPropertyprivatearray $_rules = array()
State transition table
[sourceState][input] => targetState
Default valuearray()Details
Type
array
>VPropertyprivatearray $_states = array()
Machine States alphabet
Default valuearray()Details
Type
array
>VPropertyprivatearray $_transitionActions = array()
List of input actions Each action executes when entering the state
[state1][state2] => action
Default valuearray()Details
Type
array

Methods

methodpublic__construct(array $states = array(), array $inputAphabet = array(), array $rules = array()) : void

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.
Parameters
NameTypeDescription
$statesarray
$inputAphabetarray
$rulesarray
methodpublicaddEntryAction(integer | string $state, \Zend_Search_Lucene_FSMAction $action) : void

Add state entry action.

Several entry actions are allowed. Action execution order is defined by addEntryAction() calls
Parameters
NameTypeDescription
$stateinteger | string
$action\Zend_Search_Lucene_FSMAction
methodpublicaddExitAction(integer | string $state, \Zend_Search_Lucene_FSMAction $action) : void

Add state exit action.

Several exit actions are allowed. Action execution order is defined by addEntryAction() calls
Parameters
NameTypeDescription
$stateinteger | string
$action\Zend_Search_Lucene_FSMAction
methodpublicaddInputAction(integer | string $state,  $inputSymbol, \Zend_Search_Lucene_FSMAction $action) : void

Add input action (defined by {state, input} pair).

Several input actions are allowed. Action execution order is defined by addInputAction() calls
Parameters
NameTypeDescription
$stateinteger | string
$inputSymbol
$action\Zend_Search_Lucene_FSMAction
methodpublicaddInputSymbol(integer | string $inputSymbol) : void

Add symbol to the input alphabet

Parameters
NameTypeDescription
$inputSymbolinteger | string
methodpublicaddInputSymbols(array $inputAphabet) : void

Add symbols to the input alphabet

Parameters
NameTypeDescription
$inputAphabetarray
methodpublicaddRule(integer | string $sourceState, integer | string $input, integer | string $targetState, \Zend_Search_Lucene_FSMAction | null $inputAction = null) : void

Add symbol to the input alphabet

Parameters
NameTypeDescription
$sourceStateinteger | string
$inputinteger | string
$targetStateinteger | string
$inputAction\Zend_Search_Lucene_FSMAction | null
Throws
ExceptionDescription
\Zend_Search_Exception
methodpublicaddRules(array $rules) : void

Add transition rules

array structure: array( array(sourseState, input, targetState[, inputAction]), array(sourseState, input, targetState[, inputAction]), array(sourseState, input, targetState[, inputAction]), ... )
Parameters
NameTypeDescription
$rulesarray
methodpublicaddState(integer | string $state) : void

Add state to the state machine

Parameters
NameTypeDescription
$stateinteger | string
methodpublicaddStates(array $states) : void

Add states to the state machine

Parameters
NameTypeDescription
$statesarray
methodpublicaddTransitionAction(integer | string $sourceState, integer | string $targetState, \Zend_Search_Lucene_FSMAction $action) : void

Add transition action (defined by {state, input} pair).

Several transition actions are allowed. Action execution order is defined by addTransitionAction() calls
Parameters
NameTypeDescription
$sourceStateinteger | string
$targetStateinteger | string
$action\Zend_Search_Lucene_FSMAction
methodpublicgetState() : integer | string

Get FSM state.

Returns
TypeDescription
integer | string$state|null
methodpublicprocess(mixed $input) : void

Process an input

Parameters
NameTypeDescription
$inputmixed
Throws
ExceptionDescription
\Zend_Search_Exception
methodpublicreset() : void

methodpublicsetState(integer | string $state) : void

Set FSM state.

No any action is invoked
Parameters
NameTypeDescription
$stateinteger | string
Throws
ExceptionDescription
\Zend_Search_Exception
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