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<?php
namespace Coast;
use Coast\Transformer\Rule;
use Iterator;
class Transformer extends Rule implements Iterator
{
const STEP_BREAK = 'break';
protected $_steps = [];
protected $_rules = [];
public function step($step, $index = null)
{
$index = !isset($index)
? count($this->_steps)
: $index;
array_splice($this->_steps, $index, 0, [$step]);
if ($step instanceof Rule) {
$this->_rules[$step->name()][] = $step;
}
return $this;
}
public function steps($steps = null, $index = null)
{
if (func_num_args() > 0) {
foreach ($steps as $i => $step) {
$this->step($step, isset($index) ? $index + $i : $index);
}
return $this;
}
return $this->_steps;
}
public function rule($name)
{
return isset($this->_rules[$name])
? $this->_rules[$name]
: null;
}
public function rules()
{
return $this->_rules;
}
public function __call($name, $args)
{
if ($name == self::STEP_BREAK) {
$step = $name;
} else {
$map = [
'boolean' => 'booleanType',
'integer' => 'integerType',
'null' => 'nullType',
];
if (isset($map[$name])) {
$name = $map[$name];
}
$class = get_class() . '\\Rule\\' . ucfirst($name);
$reflec = new \ReflectionClass($class);
$step = $reflec->newInstanceArgs($args);
}
return $this->step($step);
}
public function _transform($value, $context = null)
{
foreach ($this->_steps as $step) {
if ($step == self::STEP_BREAK && $value === null) {
break;
} else if ($step instanceof Rule) {
$value = $step($value, $context);
}
}
return $value;
}
public function __clone()
{
$steps = $this->_steps;
$this->_steps = [];
$this->_rules = [];
foreach ($steps as $step) {
if ($step instanceof Rule) {
$step = clone $step;
}
$this->step($step);
}
}
public function rewind()
{
reset($this->_steps);
}
public function current()
{
return current($this->_steps);
}
public function key()
{
return key($this->_steps);
}
public function next()
{
next($this->_steps);
}
public function valid()
{
return key($this->_steps) !== null;
}
}