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Reader.php
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Reader.php
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<?php
namespace Rakdar\React\Csv;
use Evenement\EventEmitterInterface;
use Evenement\EventEmitterTrait;
use React\Stream\ReadableStreamInterface;
use React\Stream\Util;
/**
* Object to parse a csv-stream into its separate elements
*
* @package Rakdar\React\Csv
*/
class Reader implements EventEmitterInterface
{
use EventEmitterTrait;
const EVENT_HEADER = 'header';
const EVENT_DATA = 'data';
/** @var ReadableStreamInterface $stream */
protected $stream;
/** @var resource $buffer */
protected $buffer;
protected $paused = false;
/** @var null|array $header */
protected $header;
protected $parseHeader = true;
protected $headerParsed = false;
protected $delimiter = ",";
protected $enclosure = "\"";
protected $escape = "\\";
protected $rowsParsed = 0;
/**
* Reader constructor.
* @param ReadableStreamInterface $stream
*/
public function __construct(ReadableStreamInterface $stream)
{
$this->stream = $stream;
$this->buffer = fopen("php://memory", "c+");
$this->stream->on("data", [$this, "handleData"]);
Util::forwardEvents($this->stream, $this, ["end", "error", "close"]);
}
/**
* Handles the data emitted from the receiving stream.
*
* @param $data
* @return void
*/
public function handleData($data)
{
fputs($this->buffer, $data);
$this->parseBuffer();
}
/**
* Tries to parse the buffer and emits header- or data-events.
*
* @return void
*/
public function parseBuffer()
{
rewind($this->buffer);
$start = 0;
while (
$this->isPaused() === false &&
$field = fgetcsv($this->buffer, 0, $this->delimiter, $this->enclosure, $this->escape)
) {
if (
feof($this->buffer) === false ||
$this->stream->isReadable() === false
) {
$start = ftell($this->buffer);
++$this->rowsParsed;
if (
$this->headerParsed === false &&
$this->parseHeader === true
) {
$this->header = $field;
$this->headerParsed = true;
$this->emit("header", [$field]);
} else {
$this->emit("data", [$field]);
}
}
}
fseek($this->buffer, $start);
$dataRemainig = stream_get_contents($this->buffer);
ftruncate($this->buffer, 0);
fputs($this->buffer, $dataRemainig);
}
/**
* Defines if the first row shold be handled separately as header.
*
* @param $parseHeader bool
* @return void
*/
public function setParseHeader($parseHeader)
{
$this->parseHeader = (bool)$parseHeader;
}
/**
* Checks if parsing is paused.
*
* @return bool
*/
public function isPaused()
{
return $this->paused;
}
/**
* Pauses the underlying stream and pauses emitting data-events.
*
* @return void
*/
public function pause()
{
$this->stream->pause();
$this->paused = true;
}
/**
* Resumes the underlying stream and starts parsing the buffer.
*
* @return void
*/
public function resume()
{
$this->paused = false;
rewind($this->buffer);
if (feof($this->buffer) === false) {
$this->parseBuffer();
}
if ($this->isPaused() === false) {
$this->stream->resume();
}
}
/**
* Stops emitting events and closes the underlying stream.
*
* @return void
*/
public function close()
{
rewind($this->buffer);
ftruncate($this->buffer, 0);
$this->stream->close();
}
/**
* Returns the header-field in case {@see setParseHeader} is set to true.
*
* @return array|null
*/
public function getHeader()
{
return $this->header;
}
/**
* Returns the number of rows parsed, including the optional header-row.
*
* @return int
*/
public function getRowsParsed()
{
return $this->rowsParsed;
}
/**
* Sets the delimiter character.
*
* @param $delimiter string
*/
public function setDelimiter($delimiter)
{
$this->delimiter = mb_substr($delimiter, 0, 1);
}
/**
* Sets the enclosure character.
*
* @param $enclosure string
*/
public function setEnclosure($enclosure)
{
$this->enclosure = mb_substr($enclosure, 0, 1);
}
/**
* Sets the escape character.
*
* @param $escape string
*/
public function setEscape($escape)
{
$this->escape = mb_substr($escape, 0, 1);
}
}