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<?php
namespace ipl\Web\Filter;
use ipl\Stdlib\Filter;
class Renderer
{
/** @var Filter\Rule */
protected $filter;
/** @var string */
protected $string;
/** @var bool Whether strict mode is enabled */
protected $strict = false;
/**
* Create a new filter Renderer
*
* @param Filter\Rule $filter
*/
public function __construct(Filter\Rule $filter)
{
$this->filter = $filter;
}
/**
* Set whether strict mode is enabled
*
* @param bool $strict
*
* @return $this
*/
public function setStrict($strict = true)
{
$this->strict = (bool) $strict;
return $this;
}
/**
* Assemble and return the filter as query string
*
* @return string
*/
public function render()
{
if ($this->string !== null) {
return $this->string;
}
$this->string = '';
$filter = $this->filter;
if ($filter instanceof Filter\Chain) {
$this->renderChain($filter, $this->strict);
} else {
/** @var Filter\Condition $filter */
$this->renderCondition($filter);
}
return $this->string;
}
/**
* Assemble the given filter Chain
*
* @param Filter\Chain $chain
* @param bool $wrap
*
* @return void
*/
protected function renderChain(Filter\Chain $chain, $wrap = false)
{
if (! $this->strict && $chain->isEmpty()) {
return;
}
$chainOperator = null;
switch (true) {
case $chain instanceof Filter\All:
$chainOperator = '&';
break;
case $chain instanceof Filter\None:
$this->string .= '!';
// Force wrap, it may be the root node
if (! $wrap) {
if ($chain->count() > 1) {
$wrap = true;
} else {
$iterator = $chain->getIterator();
$wrap = $iterator->current() instanceof Filter\None;
}
}
// None shares the operator with Any
case $chain instanceof Filter\Any:
$chainOperator = '|';
break;
}
if ($wrap) {
$this->string .= '(';
}
foreach ($chain as $rule) {
if ($rule instanceof Filter\Chain) {
$this->renderChain($rule, $this->strict || $rule->count() > 1);
} else {
/** @var Filter\Condition $rule */
$this->renderCondition($rule);
}
$this->string .= $chainOperator;
}
if (! $chain->isEmpty() && (! $this->strict || ! ($chain instanceof Filter\Any && $chain->count() === 1))) {
// Remove redundant chain operator added last
$this->string = substr($this->string, 0, -1);
} elseif ($chain->isEmpty() && $chain instanceof Filter\Any) {
// If the chain is empty and strict mode is on, we need a
// chain operator to designate it's an OR, not an AND
$this->string .= $chainOperator;
}
if ($wrap) {
$this->string .= ')';
}
}
/**
* Assemble the given filter Condition
*
* @param Filter\Condition $condition
*
* @return void
*/
protected function renderCondition(Filter\Condition $condition)
{
$value = $condition->getValue();
if (is_bool($value) && ! $value) {
$this->string .= '!';
}
$this->string .= rawurlencode($condition->getColumn());
if (is_bool($value)) {
return;
}
switch (true) {
case $condition instanceof Filter\Unlike:
$this->string .= '!~';
break;
case $condition instanceof Filter\Unequal:
$this->string .= '!=';
break;
case $condition instanceof Filter\Like:
$this->string .= '~';
break;
case $condition instanceof Filter\Equal:
$this->string .= '=';
break;
case $condition instanceof Filter\GreaterThan:
$this->string .= rawurlencode('>');
break;
case $condition instanceof Filter\LessThan:
$this->string .= rawurlencode('<');
break;
case $condition instanceof Filter\GreaterThanOrEqual:
$this->string .= rawurlencode('>') . '=';
break;
case $condition instanceof Filter\LessThanOrEqual:
$this->string .= rawurlencode('<') . '=';
break;
}
if (is_array($value)) {
$this->string .= '(' . join('|', array_map('rawurlencode', $value)) . ')';
} elseif ($value !== null) {
$this->string .= rawurlencode($value);
}
}
}
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