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|
<?php
namespace Clue\React\Utf8;
use Evenement\EventEmitter;
use React\Stream\ReadableStreamInterface;
use React\Stream\WritableStreamInterface;
use React\Stream\Util;
/**
* forwards only complete UTF-8 sequences
*/
class Sequencer extends EventEmitter implements ReadableStreamInterface
{
private $input;
private $invalid;
private $buffer = '';
private $closed = false;
public function __construct(ReadableStreamInterface $input, $replacementCharacter = '?')
{
$this->input = $input;
$this->invalid = $replacementCharacter;
if (!$input->isReadable()) {
return $this->close();
}
$this->input->on('data', array($this, 'handleData'));
$this->input->on('end', array($this, 'handleEnd'));
$this->input->on('error', array($this, 'handleError'));
$this->input->on('close', array($this, 'close'));
}
/** @internal */
public function handleData($data)
{
$this->buffer .= $data;
$len = strlen($this->buffer);
$sequence = '';
$expect = 0;
$out = '';
for ($i = 0; $i < $len; ++$i) {
$char = $this->buffer[$i];
$code = ord($char);
if ($code & 128) {
// multi-byte sequence
if ($code & 64) {
// this is the start of a sequence
// unexpected start of sequence because already within sequence
if ($expect !== 0) {
$out .= str_repeat($this->invalid, strlen($sequence));
$sequence = '';
}
$sequence = $char;
$expect = 2;
if ($code & 32) {
++$expect;
if ($code & 16) {
++$expect;
if ($code & 8) {
// invalid sequence start length
$out .= $this->invalid;
$sequence = '';
$expect = 0;
}
}
}
} else {
// this is a follow-up byte in a sequence
if ($expect === 0) {
// we're not within a sequence in first place
$out .= $this->invalid;
} else {
// valid following byte in sequence
$sequence .= $char;
// sequence reached expected length => add to output
if (strlen($sequence) === $expect) {
$out .= $sequence;
$sequence = '';
$expect = 0;
}
}
}
} else {
// simple ASCII character found
// unexpected because already within sequence
if ($expect !== 0) {
$out .= str_repeat($this->invalid, strlen($sequence));
$sequence = '';
$expect = 0;
}
$out .= $char;
}
}
if ($out !== '') {
$this->buffer = substr($this->buffer, strlen($out));
$this->emit('data', array($out));
}
}
/** @internal */
public function handleEnd()
{
if ($this->buffer !== '' && $this->invalid !== '') {
$data = str_repeat($this->invalid, strlen($this->buffer));
$this->buffer = '';
$this->emit('data', array($data));
}
if (!$this->closed) {
$this->emit('end');
$this->close();
}
}
/** @internal */
public function handleError(\Exception $error)
{
$this->emit('error', array($error));
$this->close();
}
public function isReadable()
{
return !$this->closed && $this->input->isReadable();
}
public function close()
{
if ($this->closed) {
return;
}
$this->closed = true;
$this->buffer = '';
$this->input->close();
$this->emit('close');
$this->removeAllListeners();
}
public function pause()
{
$this->input->pause();
}
public function resume()
{
$this->input->resume();
}
public function pipe(WritableStreamInterface $dest, array $options = array())
{
Util::pipe($this, $dest, $options);
return $dest;
}
}
|
