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<?php
declare(strict_types=1);
namespace Dotenv\Parser;
use Dotenv\Util\Regex;
use Dotenv\Util\Str;
final class Lines
{
/**
* This class is a singleton.
*
* @codeCoverageIgnore
*
* @return void
*/
private function __construct()
{
//
}
/**
* Process the array of lines of environment variables.
*
* This will produce an array of raw entries, one per variable.
*
* @param string[] $lines
*
* @return string[]
*/
public static function process(array $lines)
{
$output = [];
$multiline = false;
$multilineBuffer = [];
foreach ($lines as $line) {
[$multiline, $line, $multilineBuffer] = self::multilineProcess($multiline, $line, $multilineBuffer);
if (!$multiline && !self::isCommentOrWhitespace($line)) {
$output[] = $line;
}
}
return $output;
}
/**
* Used to make all multiline variable process.
*
* @param bool $multiline
* @param string $line
* @param string[] $buffer
*
* @return array{bool,string,string[]}
*/
private static function multilineProcess(bool $multiline, string $line, array $buffer)
{
$startsOnCurrentLine = $multiline ? false : self::looksLikeMultilineStart($line);
// check if $line can be multiline variable
if ($startsOnCurrentLine) {
$multiline = true;
}
if ($multiline) {
\array_push($buffer, $line);
if (self::looksLikeMultilineStop($line, $startsOnCurrentLine)) {
$multiline = false;
$line = \implode("\n", $buffer);
$buffer = [];
}
}
return [$multiline, $line, $buffer];
}
/**
* Determine if the given line can be the start of a multiline variable.
*
* @param string $line
*
* @return bool
*/
private static function looksLikeMultilineStart(string $line)
{
return Str::pos($line, '="')->map(static function () use ($line) {
return self::looksLikeMultilineStop($line, true) === false;
})->getOrElse(false);
}
/**
* Determine if the given line can be the start of a multiline variable.
*
* @param string $line
* @param bool $started
*
* @return bool
*/
private static function looksLikeMultilineStop(string $line, bool $started)
{
if ($line === '"') {
return true;
}
return Regex::occurrences('/(?=([^\\\\]"))/', \str_replace('\\\\', '', $line))->map(static function (int $count) use ($started) {
return $started ? $count > 1 : $count >= 1;
})->success()->getOrElse(false);
}
/**
* Determine if the line in the file is a comment or whitespace.
*
* @param string $line
*
* @return bool
*/
private static function isCommentOrWhitespace(string $line)
{
$line = \trim($line);
return $line === '' || (isset($line[0]) && $line[0] === '#');
}
}