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LinesOfALargeFile.php
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Wed, Jun 25, 14:35

LinesOfALargeFile.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Read the lines of a large file. Experimental and probably buggy.
*
* @group filesystem
*/
final class LinesOfALargeFile implements Iterator {
private $file;
private $handle;
private $pos;
private $buf;
private $num;
private $line;
private $valid;
public function __construct($file) {
$this->file = $file;
}
public function __destruct() {
$this->closeHandle();
}
private function closeHandle() {
if ($this->handle) {
fclose($this->handle);
$this->handle = null;
}
}
public function rewind() {
$this->closeHandle();
$this->handle = @fopen($this->file, 'r');
if (!$this->handle) {
throw new FilesystemException(
$this->file,
"Failed to open file!");
}
$this->buf = '';
$this->pos = 0;
$this->num = 0;
$this->valid = true;
$this->next();
}
public function key() {
return $this->num;
}
public function current() {
return $this->line;
}
public function valid() {
return $this->valid;
}
public function next() {
if (strlen($this->buf)) {
$endl = strpos($this->buf, "\n", $this->pos);
if ($endl !== false) {
$this->num++;
$this->line = substr($this->buf, $this->pos, ($endl - $this->pos));
$this->pos = $endl + 1;
return;
}
$this->buf = substr($this->buf, $this->pos);
$this->pos = 0;
}
$more = fread($this->handle, 2048);
if (strlen($more)) {
$this->buf .= $more;
$this->next();
} else {
if (strlen($this->buf)) {
$this->num++;
$this->line = $this->buf;
$this->buf = null;
} else {
$this->valid = false;
}
}
}
}

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