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<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
final class Header
{
/**
* Parse an array of header values containing ";" separated data into an
* array of associative arrays representing the header key value pair data
* of the header. When a parameter does not contain a value, but just
* contains a key, this function will inject a key with a '' string value.
*
* @param string|array $header Header to parse into components.
*/
public static function parse($header): array
{
static $trimmed = "\"' \n\t\r";
$params = $matches = [];
foreach ((array) $header as $value) {
foreach (self::splitList($value) as $val) {
$part = [];
foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
$m = $matches[0];
if (isset($m[1])) {
$part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);
} else {
$part[] = trim($m[0], $trimmed);
}
}
}
if ($part) {
$params[] = $part;
}
}
}
return $params;
}
/**
* Converts an array of header values that may contain comma separated
* headers into an array of headers with no comma separated values.
*
* @param string|array $header Header to normalize.
*
* @deprecated Use self::splitList() instead.
*/
public static function normalize($header): array
{
$result = [];
foreach ((array) $header as $value) {
foreach (self::splitList($value) as $parsed) {
$result[] = $parsed;
}
}
return $result;
}
/**
* Splits a HTTP header defined to contain a comma-separated list into
* each individual value. Empty values will be removed.
*
* Example headers include 'accept', 'cache-control' and 'if-none-match'.
*
* This method must not be used to parse headers that are not defined as
* a list, such as 'user-agent' or 'set-cookie'.
*
* @param string|string[] $values Header value as returned by MessageInterface::getHeader()
*
* @return string[]
*/
public static function splitList($values): array
{
if (!\is_array($values)) {
$values = [$values];
}
$result = [];
foreach ($values as $value) {
if (!\is_string($value)) {
throw new \TypeError('$header must either be a string or an array containing strings.');
}
$v = '';
$isQuoted = false;
$isEscaped = false;
for ($i = 0, $max = \strlen($value); $i < $max; ++$i) {
if ($isEscaped) {
$v .= $value[$i];
$isEscaped = false;
continue;
}
if (!$isQuoted && $value[$i] === ',') {
$v = \trim($v);
if ($v !== '') {
$result[] = $v;
}
$v = '';
continue;
}
if ($isQuoted && $value[$i] === '\\') {
$isEscaped = true;
$v .= $value[$i];
continue;
}
if ($value[$i] === '"') {
$isQuoted = !$isQuoted;
$v .= $value[$i];
continue;
}
$v .= $value[$i];
}
$v = \trim($v);
if ($v !== '') {
$result[] = $v;
}
}
return $result;
}
}
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