Inflector.php

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<?php
#require_once 'Zend/Filter.php';

#require_once 'Zend/Loader/PluginLoader.php';

class Zend_Filter_Inflector implements Zend_Filter_Interface
{
    protected $_pluginLoader = null;

    protected $_target = null;

    protected $_throwTargetExceptionsOn = true;

    protected $_targetReplacementIdentifier = ':';

    protected $_rules = array();

    public function __construct($options = null)
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        } else if (!is_array($options)) {
            $options = func_get_args();
            $temp    = array();

            if (!empty($options)) {
                $temp['target'] = array_shift($options);
            }

            if (!empty($options)) {
                $temp['rules'] = array_shift($options);
            }

            if (!empty($options)) {
                $temp['throwTargetExceptionsOn'] = array_shift($options);
            }

            if (!empty($options)) {
                $temp['targetReplacementIdentifier'] = array_shift($options);
            }

            $options = $temp;
        }

        $this->setOptions($options);
    }

    public function getPluginLoader()
    {
        if (!$this->_pluginLoader instanceof Zend_Loader_PluginLoader_Interface) {
            $this->_pluginLoader = new Zend_Loader_PluginLoader(array('Zend_Filter_' => 'Zend/Filter/'), __CLASS__);
        }

        return $this->_pluginLoader;
    }

    public function setPluginLoader(Zend_Loader_PluginLoader_Interface $pluginLoader)
    {
        $this->_pluginLoader = $pluginLoader;
        return $this;
    }

    public function setConfig(Zend_Config $config)
    {
        return $this->setOptions($config);
    }

    public function setOptions($options) {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        }

        // Set Präfix Path
        if (array_key_exists('filterPrefixPath', $options)) {
            if (!is_scalar($options['filterPrefixPath'])) {
                foreach ($options['filterPrefixPath'] as $prefix => $path) {
                    $this->addFilterPrefixPath($prefix, $path);
                }
            }
        }

        if (array_key_exists('throwTargetExceptionsOn', $options)) {
            $this->setThrowTargetExceptionsOn($options['throwTargetExceptionsOn']);
        }

        if (array_key_exists('targetReplacementIdentifier', $options)) {
            $this->setTargetReplacementIdentifier($options['targetReplacementIdentifier']);
        }

        if (array_key_exists('target', $options)) {
            $this->setTarget($options['target']);
        }

        if (array_key_exists('rules', $options)) {
            $this->addRules($options['rules']);
        }

        return $this;
    }

    public function addFilterPrefixPath($prefix, $path)
    {
        $this->getPluginLoader()->addPrefixPath($prefix, $path);
        return $this;
    }

    public function setThrowTargetExceptionsOn($throwTargetExceptionsOn)
    {
        $this->_throwTargetExceptionsOn = ($throwTargetExceptionsOn == true) ? true : false;
        return $this;
    }

    public function isThrowTargetExceptionsOn()
    {
        return $this->_throwTargetExceptionsOn;
    }

    public function setTargetReplacementIdentifier($targetReplacementIdentifier)
    {
        if ($targetReplacementIdentifier) {
            $this->_targetReplacementIdentifier = (string) $targetReplacementIdentifier;
        }

        return $this;
    }

    public function getTargetReplacementIdentifier()
    {
        return $this->_targetReplacementIdentifier;
    }

    public function setTarget($target)
    {
        $this->_target = (string) $target;
        return $this;
    }

    public function getTarget()
    {
        return $this->_target;
    }

    public function setTargetReference(&$target)
    {
        $this->_target =& $target;
        return $this;
    }

    public function setRules(Array $rules)
    {
        $this->clearRules();
        $this->addRules($rules);
        return $this;
    }

    public function addRules(Array $rules)
    {
        $keys = array_keys($rules);
        foreach ($keys as $spec) {
            if ($spec[0] == ':') {
                $this->addFilterRule($spec, $rules[$spec]);
            } else {
                $this->setStaticRule($spec, $rules[$spec]);
            }
        }

        return $this;
    }

    public function getRules($spec = null)
    {
        if (null !== $spec) {
            $spec = $this->_normalizeSpec($spec);
            if (isset($this->_rules[$spec])) {
                return $this->_rules[$spec];
            }
            return false;
        }

        return $this->_rules;
    }

    public function getRule($spec, $index)
    {
        $spec = $this->_normalizeSpec($spec);
        if (isset($this->_rules[$spec]) && is_array($this->_rules[$spec])) {
            if (isset($this->_rules[$spec][$index])) {
                return $this->_rules[$spec][$index];
            }
        }
        return false;
    }

    public function clearRules()
    {
        $this->_rules = array();
        return $this;
    }

    public function setFilterRule($spec, $ruleSet)
    {
        $spec = $this->_normalizeSpec($spec);
        $this->_rules[$spec] = array();
        return $this->addFilterRule($spec, $ruleSet);
    }

    public function addFilterRule($spec, $ruleSet)
    {
        $spec = $this->_normalizeSpec($spec);
        if (!isset($this->_rules[$spec])) {
            $this->_rules[$spec] = array();
        }

        if (!is_array($ruleSet)) {
            $ruleSet = array($ruleSet);
        }

        if (is_string($this->_rules[$spec])) {
            $temp = $this->_rules[$spec];
            $this->_rules[$spec] = array();
            $this->_rules[$spec][] = $temp;
        }

        foreach ($ruleSet as $rule) {
            $this->_rules[$spec][] = $this->_getRule($rule);
        }

        return $this;
    }

    public function setStaticRule($name, $value)
    {
        $name = $this->_normalizeSpec($name);
        $this->_rules[$name] = (string) $value;
        return $this;
    }

    public function setStaticRuleReference($name, &$reference)
    {
        $name = $this->_normalizeSpec($name);
        $this->_rules[$name] =& $reference;
        return $this;
    }

    public function filter($source)
    {
        // clean source
        foreach ( (array) $source as $sourceName => $sourceValue) {
            $source[ltrim($sourceName, ':')] = $sourceValue;
        }

        $pregQuotedTargetReplacementIdentifier = preg_quote($this->_targetReplacementIdentifier, '#');
        $processedParts = array();

        foreach ($this->_rules as $ruleName => $ruleValue) {
            if (isset($source[$ruleName])) {
                if (is_string($ruleValue)) {
                    // overriding the set rule
                    $processedParts['#'.$pregQuotedTargetReplacementIdentifier.$ruleName.'#'] = str_replace('\\', '\\\\', $source[$ruleName]);
                } elseif (is_array($ruleValue)) {
                    $processedPart = $source[$ruleName];
                    foreach ($ruleValue as $ruleFilter) {
                        $processedPart = $ruleFilter->filter($processedPart);
                    }
                    $processedParts['#'.$pregQuotedTargetReplacementIdentifier.$ruleName.'#'] = str_replace('\\', '\\\\', $processedPart);
                }
            } elseif (is_string($ruleValue)) {
                $processedParts['#'.$pregQuotedTargetReplacementIdentifier.$ruleName.'#'] = str_replace('\\', '\\\\', $ruleValue);
            }
        }

        // all of the values of processedParts would have been str_replace('\\', '\\\\', ..)'d to disable preg_replace backreferences
        $inflectedTarget = preg_replace(array_keys($processedParts), array_values($processedParts), $this->_target);

        if ($this->_throwTargetExceptionsOn && (preg_match('#(?='.$pregQuotedTargetReplacementIdentifier.'[A-Za-z]{1})#', $inflectedTarget) == true)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('A replacement identifier ' . $this->_targetReplacementIdentifier . ' was found inside the inflected target, perhaps a rule was not satisfied with a target source?  Unsatisfied inflected target: ' . $inflectedTarget);
        }

        return $inflectedTarget;
    }

    protected function _normalizeSpec($spec)
    {
        return ltrim((string) $spec, ':&');
    }

    protected function _getRule($rule)
    {
        if ($rule instanceof Zend_Filter_Interface) {
            return $rule;
        }

        $rule = (string) $rule;

        $className  = $this->getPluginLoader()->load($rule);
        $ruleObject = new $className();
        if (!$ruleObject instanceof Zend_Filter_Interface) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception('No class named ' . $rule . ' implementing Zend_Filter_Interface could be found');
        }

        return $ruleObject;
    }
}