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<?php
declare(strict_types=1);
namespace GraphQL\Utils;
use function array_pop;
use function array_shift;
use function count;
use function implode;
use function mb_strlen;
use function mb_substr;
use function preg_split;
use function trim;
class BlockString
{
/**
* Produces the value of a block string from its parsed raw value, similar to
* Coffeescript's block string, Python's docstring trim or Ruby's strip_heredoc.
*
* This implements the GraphQL spec's BlockStringValue() static algorithm.
*/
public static function value($rawString)
{
// Expand a block string's raw value into independent lines.
$lines = preg_split("/\\r\\n|[\\n\\r]/", $rawString);
// Remove common indentation from all lines but first.
$commonIndent = null;
$linesLength = count($lines);
for ($i = 1; $i < $linesLength; $i++) {
$line = $lines[$i];
$indent = self::leadingWhitespace($line);
if ($indent >= mb_strlen($line) ||
($commonIndent !== null && $indent >= $commonIndent)
) {
continue;
}
$commonIndent = $indent;
if ($commonIndent === 0) {
break;
}
}
if ($commonIndent) {
for ($i = 1; $i < $linesLength; $i++) {
$line = $lines[$i];
$lines[$i] = mb_substr($line, $commonIndent);
}
}
// Remove leading and trailing blank lines.
while (count($lines) > 0 && trim($lines[0], " \t") === '') {
array_shift($lines);
}
while (count($lines) > 0 && trim($lines[count($lines) - 1], " \t") === '') {
array_pop($lines);
}
// Return a string of the lines joined with U+000A.
return implode("\n", $lines);
}
private static function leadingWhitespace($str)
{
$i = 0;
while ($i < mb_strlen($str) && ($str[$i] === ' ' || $str[$i] === '\t')) {
$i++;
}
return $i;
}
}