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<?php
namespace Dotenv\Loader;
class Lines
{
/**
* Process the array of lines of environment variables.
*
* This will produce an array of entries, one per variable.
*
* @param string[] $lines
*
* @return string[]
*/
public static function process(array $lines)
{
$output = [];
$multiline = false;
$multilineBuffer = [];
foreach ($lines as $line) {
list($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[] $buffer
*
* @return array{bool,string,string[]}
*/
private static function multilineProcess($multiline, $line, array $buffer)
{
// check if $line can be multiline variable
if ($started = self::looksLikeMultilineStart($line)) {
$multiline = true;
}
if ($multiline) {
array_push($buffer, $line);
if (self::looksLikeMultilineStop($line, $started)) {
$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 $line
*
* @return bool
*/
private static function looksLikeMultilineStart($line)
{
if (strpos($line, '="') === false) {
return false;
}
return self::looksLikeMultilineStop($line, true) === false;
}
/**
* Determine if the given line can be the start of a multiline variable.
*
* @param string $line
* @param bool $started
*
* @return bool
*/
private static function looksLikeMultilineStop($line, $started)
{
if ($line === '"') {
return true;
}
$seen = $started ? 0 : 1;
foreach (self::getCharPairs(str_replace('\\\\', '', $line)) as $pair) {
if ($pair[0] !== '\\' && $pair[1] === '"') {
$seen++;
}
}
return $seen > 1;
}
/**
* Get all pairs of adjacent characters within the line.
*
* @param string $line
*
* @return array{array{string,string|null}}
*/
private static function getCharPairs($line)
{
$chars = str_split($line);
/** @var array{array{string,string|null}} */
return array_map(null, $chars, array_slice($chars, 1));
}
/**
* Determine if the line in the file is a comment or whitespace.
*
* @param string $line
*
* @return bool
*/
private static function isCommentOrWhitespace($line)
{
if (trim($line) === '') {
return true;
}
$line = ltrim($line);
return isset($line[0]) && $line[0] === '#';
}
}