Библиотека для cis, online, cms1
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Фёдор Подлеснов
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477
PHPTAL/RepeatController.php
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477
PHPTAL/RepeatController.php
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4: */
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//
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// Copyright (c) 2004-2005 Laurent Bedubourg
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Authors: Laurent Bedubourg <lbedubourg@motion-twin.com>
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//
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/**
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* Stores tal:repeat information during template execution.
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*
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* An instance of this class is created and stored into PHPTAL context on each
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* tal:repeat usage.
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*
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* repeat/item/index
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* repeat/item/number
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* ...
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* are provided by this instance.
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*
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* 'repeat' is an StdClass instance created to handle RepeatControllers,
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* 'item' is an instance of this class.
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*
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* @package phptal
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* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
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*/
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class PHPTAL_RepeatController implements Iterator
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{
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private $key;
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private $current;
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private $valid;
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private $validOnNext;
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protected $iterator;
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protected $index;
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protected $end;
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protected $length;
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/**
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* Construct a new RepeatController.
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*
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* @param $source array, string, iterator, iterable.
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*/
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public function __construct($source)
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{
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if ( is_string($source) ) {
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$this->iterator = new ArrayIterator( str_split($source) ); // FIXME: invalid for UTF-8 encoding, use preg_match_all('/./u') trick
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} else if ( is_array($source) ) {
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$this->iterator = new ArrayIterator($source);
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} else if ( $source instanceof IteratorAggregate ) {
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$this->iterator = $source->getIterator();
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} else if ( $source instanceof Iterator ) {
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$this->iterator = $source;
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} else if ( $source instanceof SimpleXMLElement) { // has non-unique keys!
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$array = array();
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foreach ( $source as $v ) {
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$array[] = $v;
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}
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$this->iterator = new ArrayIterator($array);
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} else if ( $source instanceof Traversable || $source instanceof DOMNodeList ) {
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// PDO Statements for example implement the engine internal Traversable
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// interface. To make it fully iterable we traverse the set to populate
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// an array which will be actually used for iteration.
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$array = array();
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foreach ( $source as $k=>$v ) {
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$array[$k] = $v;
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}
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$this->iterator = new ArrayIterator($array);
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} else {
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$this->iterator = new ArrayIterator( array() );
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}
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// Try to find the set length
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$this->length = 0;
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if ( $this->iterator instanceof Countable ) {
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$this->length = count($this->iterator);
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} else if ( is_object($this->iterator) ) {
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// This should be removed since there is already the Countable interface in PHP5
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if ( method_exists( $this->iterator, 'size' ) ) {
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$this->length = $this->iterator->size();
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} else if ( method_exists( $this->iterator, 'length' ) ) {
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$this->length = $this->iterator->length();
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}
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}
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$this->groups = new PHPTAL_RepeatController_Groups();
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$this->rewind();
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}
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/**
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* Returns the current element value in the iteration
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*
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* @return Mixed The current element value
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*/
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public function current()
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{
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return $this->current;
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}
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/**
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* Returns the current element key in the iteration
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*
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* @return String/Int The current element key
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*/
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public function key()
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{
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return $this->key;
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}
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/**
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* Tells if the iteration is over
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*
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* @return bool True if the iteration is not finished yet
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*/
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public function valid()
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{
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$valid = $this->valid || $this->validOnNext;
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$this->validOnNext = $this->valid;
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return $valid;
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}
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/**
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* Restarts the iteration process going back to the first element
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*
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*/
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public function rewind()
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{
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$this->index = 0;
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$this->end = false;
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$this->iterator->rewind();
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// Prefetch the next element
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if ( $this->iterator->valid() ) {
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$this->validOnNext = true;
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$this->prefetch();
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} else {
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$this->validOnNext = false;
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}
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// Notify the grouping helper of the change
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$this->groups->reset();
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}
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/**
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* Fetches the next element in the iteration and advances the pointer
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*
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*/
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public function next()
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{
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$this->index++;
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// Prefetch the next element
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$this->prefetch();
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// Notify the grouping helper of the change
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$this->groups->reset();
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}
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/**
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* Gets an object property
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*
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* @return $var Mixed The variable value
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*/
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public function __get( $var )
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{
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switch ( $var ) {
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case 'index':
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case 'end':
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case 'length':
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return $this->$var;
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case 'number':
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return $this->index + 1;
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case 'start':
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return $this->index === 0;
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case 'even':
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return ($this->index % 2) === 0;
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case 'odd':
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return ($this->index % 2) === 1;
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case 'key':
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return $this->key();
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case 'letter':
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return strtolower( $this->int2letter($this->index+1) );
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case 'Letter':
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return strtoupper( $this->int2letter($this->index+1) );
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case 'roman':
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return strtolower( $this->int2roman($this->index+1) );
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case 'Roman':
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return strtoupper( $this->int2roman($this->index+1) );
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case 'first':
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// Compare the current one with the previous in the dictionary
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$res = $this->groups->first( $this->current );
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return is_bool($res) ? $res : $this->groups;
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case 'last':
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// Compare the next one with the dictionary
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$res = $this->groups->last( $this->iterator->current() );
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return is_bool($res) ? $res : $this->groups;
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default:
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throw new PHPTAL_Exception( "Unable to find part '$var' in repeater controller" );
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}
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}
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/**
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* Fetches the next element from the source data store and
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* updates the end flag if needed.
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*
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* @access protected
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*/
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protected function prefetch()
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{
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$this->valid = true;
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$this->key = $this->iterator->key();
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$this->current = $this->iterator->current();
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$this->iterator->next();
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if ( !$this->iterator->valid() ) {
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$this->valid = false;
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$this->end = true;
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}
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}
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/**
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* Converts an integer number (1 based) to a sequence of letters
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*
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* @param $int Int The number to convert
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* @return String The letters equivalent as a, b, c-z ... aa, ab, ac-zz ...
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* @access protected
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*/
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protected function int2letter( $int )
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{
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$lookup = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$size = strlen($lookup);
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$letters = '';
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while ( $int > 0 ) {
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$int--;
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$letters = $lookup[$int % $size] . $letters;
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$int = floor($int / $size);
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}
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return $letters;
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}
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/**
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* Converts an integer number (1 based) to a roman numeral
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*
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* @param $int Int The number to convert
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* @return String The roman numeral
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* @access protected
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*/
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protected function int2roman( $int )
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{
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$lookup = array(
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'1000' => 'M',
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'900' => 'CM',
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'500' => 'D',
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'400' => 'CD',
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'100' => 'C',
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'90' => 'XC',
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'50' => 'L',
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'40' => 'XL',
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'10' => 'X',
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'9' => 'IX',
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'5' => 'V',
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'4' => 'IV',
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'1' => 'I',
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);
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$roman = '';
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foreach ( $lookup as $max => $letters ) {
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while ( $int >= $max ) {
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$roman .= $letters;
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$int -= $max;
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}
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}
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return $roman;
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}
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}
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/**
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* Keeps track of variable contents when using grouping in a path (first/ and last/)
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*
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* @package phptal
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* @author Iván Montes <drslump@pollinimini.net>
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*/
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class PHPTAL_RepeatController_Groups {
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protected $dict = array();
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protected $cache = array();
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protected $data = null;
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protected $vars = array();
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protected $branch;
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public function __construct()
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{
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$this->dict = array();
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$this->reset();
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}
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/**
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* Resets the result caches. Use it to signal an iteration in the loop
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*
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*/
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public function reset()
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{
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$this->cache = array();
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}
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/**
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* Checks if the data passed is the first one in a group
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*
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* @param $data Mixed The data to evaluate
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* @return Mixed True if the first item in the group, false if not and
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* this same object if the path is not finished
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*/
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public function first( $data )
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{
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if ( !is_array($data) && !is_object($data) && !is_null($data) ) {
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if ( !isset($this->cache['F']) ) {
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$hash = md5($data);
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if ( !isset($this->dict['F']) || $this->dict['F'] !== $hash ) {
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$this->dict['F'] = $hash;
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$res = true;
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} else {
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$res = false;
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}
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$this->cache['F'] = $res;
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}
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return $this->cache['F'];
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}
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$this->data = $data;
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$this->branch = 'F';
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$this->vars = array();
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return $this;
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}
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/**
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* Checks if the data passed is the last one in a group
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*
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* @param $data Mixed The data to evaluate
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* @return Mixed True if the last item in the group, false if not and
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* this same object if the path is not finished
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*/
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public function last( $data )
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{
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if ( !is_array($data) && !is_object($data) && !is_null($data) ) {
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if ( !isset($this->cache['L']) ) {
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$hash = md5($data);
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if (empty($this->dict['L'])) {
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$this->dict['L'] = $hash;
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$res = false;
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} else if ( $this->dict['L'] !== $hash ) {
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$this->dict['L'] = $hash;
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$res = true;
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} else {
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$res = false;
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}
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$this->cache['L'] = $res;
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}
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return $this->cache['L'];
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}
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$this->data = $data;
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$this->branch = 'L';
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$this->vars = array();
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return $this;
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}
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/**
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* Handles variable accesses for the tal path resolver
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*
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* @param $var String The variable name to check
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* @return Mixed An object/array if the path is not over or a boolean
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*
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* @todo replace the phptal_path() with custom code
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*/
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public function __get( $var )
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{
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// When the iterator item is empty we just let the tal
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// expression consume by continuously returning this
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// same object which should evaluate to true for 'last'
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if ( is_null($this->data) ) {
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return $this;
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}
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// Find the requested variable
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$value = @phptal_path( $this->data, $var, true );
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// Check if it's an object or an array
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if ( is_array($value) || is_object($value) ) {
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// Move the context to the requested variable and return
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$this->data = $value;
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$this->addVarName( $var );
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return $this;
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}
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// get a hash of the variable contents
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$hash = md5( $value );
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// compute a path for the variable to use as dictionary key
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$path = $this->branch . $this->getVarPath() . $var;
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// If we don't know about this var store in the dictionary
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if ( !isset($this->cache[$path]) ) {
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if ( !isset($this->dict[$path]) ) {
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$this->dict[$path] = $hash;
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$res = $this->branch === 'F';
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} else {
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// Check if the value has changed
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if ( $this->dict[$path] !== $hash ) {
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$this->dict[$path] = $hash;
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$res = true;
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} else {
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$res = false;
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}
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}
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$this->cache[$path] = $res;
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}
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return $this->cache[$path];
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}
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/**
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* Adds a variable name to the current path of variables
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*
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* @param $varname String The variable name to store as a path part
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* @access protected
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*/
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protected function addVarName( $varname )
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{
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$this->vars[] = $varname;
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}
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/**
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* Returns the current variable path separated by a slash
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*
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* @return String The current variable path
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* @access protected
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*/
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protected function getVarPath()
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{
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return implode('/', $this->vars) . '/';
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}
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}
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