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psalm/src/Psalm/FileManipulation.php

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<?php
namespace Psalm;
use function sha1;
use function strlen;
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use function strrpos;
use function substr;
use function trim;
class FileManipulation
{
/** @var int */
public $start;
/** @var int */
public $end;
/** @var string */
public $insertion_text;
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/** @var bool */
public $preserve_indentation;
/**
* @param int $start
* @param int $end
* @param string $insertion_text
*/
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public function __construct(int $start, int $end, string $insertion_text, bool $preserve_indentation = false)
{
$this->start = $start;
$this->end = $end;
$this->insertion_text = $insertion_text;
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$this->preserve_indentation = $preserve_indentation;
}
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public function getKey() : string
{
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return $this->start === $this->end
? ($this->start . ':' . sha1($this->insertion_text))
: ($this->start . ':' . $this->end);
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}
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public function transform(string $existing_contents) : string
{
if ($this->preserve_indentation) {
$newline_pos = strrpos($existing_contents, "\n", $this->start - strlen($existing_contents));
$newline_pos = $newline_pos !== false ? $newline_pos + 1 : 0;
$indentation = substr($existing_contents, $newline_pos, $this->start - $newline_pos);
if (trim($indentation) === '') {
$this->insertion_text = $this->insertion_text . $indentation;
}
}
return substr($existing_contents, 0, $this->start)
. $this->insertion_text
. substr($existing_contents, $this->end);
}
}