<?php
declare(strict_types=1);
namespace ParagonIE\Iaso;
use ParagonIE\ConstantTime\Binary;
use ParagonIE\Iaso\Contract\Blank;
/**
* Class ParseState
* @package ParagonIE\Iaso
*/
class ParseState
{
/**
* @var Contract
*/
public $contract;
/**
* @var string
*/
public $data = '';
/**
* @var int
*/
public $length = 0;
/**
* @var int
*/
public $pos = 0;
/**
* @var ResultSet
*/
public $result;
/**
* @var array<mixed, array<mixed, mixed>>
*/
public $stack = [];
/**
* @var int
*/
public $start = 0;
/**
* ParseState constructor.
* @param string $data
* @param Contract|null $contract
* @param int $start
* @param int $len
*/
public function __construct(
string $data = '',
Contract $contract = null,
int $start = 0,
int $len = 0
) {
$this->data = $data;
if (\is_null($contract)) {
$contract = new Blank();
}
$this->contract = $contract;
$this->start = $start;
$this->length = $len;
}
/**
* Get the current character.
*
* @return string
*/
public function getChar(): string
{
if ($this->pos >= Binary::safeStrlen($this->data)) {
return '';
}
return $this->data[$this->pos];
}
/**
* @return bool
*/
public function moreToRead(): bool
{
return $this->pos < $this->length;
}
/**
* @return int
*/
public function getLastIndex(): int
{
$keys = \array_keys($this->stack);
return (int) \array_pop($keys);
}
/**
* @param ResultSet $pop
* @return ParseState
* @throws JSONError
*/
public function passToParent(ResultSet $pop): ParseState
{
if (empty($this->stack)) {
// We're done parsing!
$this->result = $pop;
return $this;
}
$idx = $this->getLastIndex();
if ($this->stack[$idx]['type'] === '[') {
// Just append
$this->stack[$idx]['obj'][] = clone $pop;
} elseif ($this->stack[$idx]['type'] === '{') {
// Specify its key value.
if (empty($this->stack[$idx]['pending'])) {
throw new JSONError('Unexpected value (no key)');
}
$key = $this->stack[$idx]['pending'];
$this->stack[$idx]['obj'][$key] = clone $pop;
unset($this->stack[$idx]['pending']);
}
return $this;
}
/**
* Return the latest element of the array without removing it.
*
* @return array
*/
public function softPop(): array
{
return $this->stack[$this->getLastIndex()];
}
}
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