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<?php
namespace Laminas\Json;
use Laminas\Json\Exception\InvalidArgumentException;
use Laminas\Json\Exception\RuntimeException;
use stdClass;
use function chr;
use function floatval;
use function function_exists;
use function hexdec;
use function in_array;
use function intval;
use function is_numeric;
use function is_string;
use function mb_convert_encoding;
use function ord;
use function preg_match;
use function sprintf;
use function str_replace;
use function strlen;
use function strpos;
use function substr;
use const PREG_OFFSET_CAPTURE;
/**
* Decode JSON encoded string to PHP variable constructs
*/
class Decoder
{
/**
* Parse tokens used to decode the JSON object. These are not
* for public consumption, they are just used internally to the
* class.
*/
public const EOF = 0;
public const DATUM = 1;
public const LBRACE = 2;
public const LBRACKET = 3;
public const RBRACE = 4;
public const RBRACKET = 5;
public const COMMA = 6;
public const COLON = 7;
/**
* Use to maintain a "pointer" to the source being decoded
*
* @var string
*/
protected $source;
/**
* Caches the source length
*
* @var int
*/
protected $sourceLength;
/**
* The offset within the source being decoded
*
* @var int
*/
protected $offset;
/**
* The current token being considered in the parser cycle
*
* @var int
*/
protected $token;
/**
* Flag indicating how objects should be decoded
*
* @var int
* @access protected
*/
protected $decodeType;
/** @var mixed */
protected $tokenValue;
/**
* Decode Unicode Characters from \u0000 ASCII syntax.
*
* This algorithm was originally developed for the
* Solar Framework by Paul M. Jones
*
* @link http://solarphp.com/
* @link https://github.com/solarphp/core/blob/master/Solar/Json.php
*
* @param string $chrs
* @return string
*/
public static function decodeUnicodeString($chrs)
{
$chrs = (string) $chrs;
$utf8 = '';
$strlenChrs = strlen($chrs);
for ($i = 0; $i < $strlenChrs; $i++) {
$ordChrsC = ord($chrs[$i]);
switch (true) {
case preg_match('/\\\u[0-9A-F]{4}/i', substr($chrs, $i, 6)):
// single, escaped unicode character
$utf16 = chr(hexdec(substr($chrs, $i + 2, 2)))
. chr(hexdec(substr($chrs, $i + 4, 2)));
$utf8char = self::utf162utf8($utf16);
$search = ['\\', "\n", "\t", "\r", chr(0x08), chr(0x0C), '"', '\'', '/'];
if (in_array($utf8char, $search)) {
$replace = ['\\\\', '\\n', '\\t', '\\r', '\\b', '\\f', '\\"', '\\\'', '\\/'];
$utf8char = str_replace($search, $replace, $utf8char);
}
$utf8 .= $utf8char;
$i += 5;
break;
case ($ordChrsC >= 0x20) && ($ordChrsC <= 0x7F):
$utf8 .= $chrs[$i];
break;
case ($ordChrsC & 0xE0) === 0xC0:
// characters U-00000080 - U-000007FF, mask 110XXXXX
//see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $i, 2);
++$i;
break;
case ($ordChrsC & 0xF0) === 0xE0:
// characters U-00000800 - U-0000FFFF, mask 1110XXXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $i, 3);
$i += 2;
break;
case ($ordChrsC & 0xF8) === 0xF0:
// characters U-00010000 - U-001FFFFF, mask 11110XXX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $i, 4);
$i += 3;
break;
case ($ordChrsC & 0xFC) === 0xF8:
// characters U-00200000 - U-03FFFFFF, mask 111110XX
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $i, 5);
$i += 4;
break;
case ($ordChrsC & 0xFE) === 0xFC:
// characters U-04000000 - U-7FFFFFFF, mask 1111110X
// see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
$utf8 .= substr($chrs, $i, 6);
$i += 5;
break;
}
}
return $utf8;
}
/**
* Constructor
*
* @param string $source String source to decode
* @param int $decodeType How objects should be decoded -- see
* {@link Json::TYPE_ARRAY} and {@link Json::TYPE_OBJECT} for * valid
* values
* @throws InvalidArgumentException
*/
protected function __construct($source, $decodeType)
{
// Set defaults
$this->source = self::decodeUnicodeString($source);
$this->sourceLength = strlen($this->source);
$this->token = self::EOF;
$this->offset = 0;
$this->decodeType = match ($decodeType) {
Json::TYPE_ARRAY, Json::TYPE_OBJECT => $decodeType,
default => throw new InvalidArgumentException(sprintf(
'Unknown decode type "%s", please use one of the Json::TYPE_* constants',
$decodeType
)),
};
// Set pointer at first token
$this->getNextToken();
}
/**
* Decode a JSON source string.
*
* Decodes a JSON encoded string; the value returned will be one of the
* following:
*
* - integer
* - float
* - boolean
* - null
* - stdClass
* - array
* - array of one or more of the above types
*
* By default, decoded objects will be returned as a stdClass object;
* to return associative arrays instead, pass {@link Json::TYPE_ARRAY}
* to the $objectDecodeType parameter.
*
* @param string $source String to be decoded.
* @param int $objectDecodeType How objects should be decoded; should be
* either or {@link Json::TYPE_ARRAY} or {@link Json::TYPE_OBJECT};
* defaults to Json::TYPE_OBJECT.
* @return mixed
*/
public static function decode($source, $objectDecodeType = Json::TYPE_OBJECT)
{
$decoder = new static($source, $objectDecodeType);
return $decoder->decodeValue();
}
/**
* Recursive routine for supported toplevel types.
*
* @return mixed
*/
protected function decodeValue()
{
switch ($this->token) {
case self::DATUM:
$result = $this->tokenValue;
$this->getNextToken();
return $result;
case self::LBRACE:
return $this->decodeObject();
case self::LBRACKET:
return $this->decodeArray();
default:
return;
}
}
/**
* Decodes an object of the form { "attribute: value, "attribute2" : value, ... }
*
* If Laminas\Json\Encoder was used to encode the original object, then
* a special attribute called __className will specify a class
* name with which to wrap the data contained within the encoded source.
*
* Decodes to either an array or stdClass object, based on the value of
* {@link $decodeType}. If invalid $decodeType present, returns as an
* array.
*
* @return array|stdClass
* @throws RuntimeException
*/
protected function decodeObject()
{
$members = [];
$tok = $this->getNextToken();
while ($tok && $tok !== self::RBRACE) {
if ($tok !== self::DATUM || ! is_string($this->tokenValue)) {
throw new RuntimeException(sprintf('Missing key in object encoding: %s', $this->source));
}
$key = $this->tokenValue;
$tok = $this->getNextToken();
if ($tok !== self::COLON) {
throw new RuntimeException(sprintf('Missing ":" in object encoding: %s', $this->source));
}
$this->getNextToken();
$members[$key] = $this->decodeValue();
$tok = $this->token;
if ($tok === self::RBRACE) {
break;
}
if ($tok !== self::COMMA) {
throw new RuntimeException(sprintf('Missing "," in object encoding: %s', $this->source));
}
$tok = $this->getNextToken();
}
switch ($this->decodeType) {
case Json::TYPE_OBJECT:
// Create new stdClass and populate with $members
$result = new stdClass();
foreach ($members as $key => $value) {
if ($key === '') {
$key = '_empty_';
}
$result->$key = $value;
}
break;
case Json::TYPE_ARRAY:
// intentionally fall-through
default:
$result = $members;
break;
}
$this->getNextToken();
return $result;
}
/**
* Decodes the JSON array format [element, element2, ..., elementN]
*
* @return array
* @throws RuntimeException
*/
protected function decodeArray()
{
$result = [];
$tok = $this->getNextToken(); // Move past the '['
$index = 0;
while ($tok && $tok !== self::RBRACKET) {
$result[$index++] = $this->decodeValue();
$tok = $this->token;
if ($tok === self::RBRACKET || ! $tok) {
break;
}
if ($tok !== self::COMMA) {
throw new RuntimeException(sprintf('Missing "," in array encoding: %s', $this->source));
}
$tok = $this->getNextToken();
}
$this->getNextToken();
return $result;
}
/**
* Removes whitespace characters from the source input.
*/
protected function eatWhitespace()
{
if (
preg_match('/([\t\b\f\n\r ])*/s', $this->source, $matches, PREG_OFFSET_CAPTURE, $this->offset)
&& $matches[0][1] === $this->offset
) {
$this->offset += strlen($matches[0][0]);
}
}
/**
* Retrieves the next token from the source stream.
*
* @return int Token constant value specified in class definition.
* @throws RuntimeException
*/
protected function getNextToken()
{
$this->token = self::EOF;
$this->tokenValue = null;
$this->eatWhitespace();
if ($this->offset >= $this->sourceLength) {
return self::EOF;
}
$str = $this->source;
$strLength = $this->sourceLength;
$i = $this->offset;
$start = $i;
switch ($str[$i]) {
case '{':
$this->token = self::LBRACE;
break;
case '}':
$this->token = self::RBRACE;
break;
case '[':
$this->token = self::LBRACKET;
break;
case ']':
$this->token = self::RBRACKET;
break;
case ',':
$this->token = self::COMMA;
break;
case ':':
$this->token = self::COLON;
break;
case '"':
$result = '';
do {
$i++;
if ($i >= $strLength) {
break;
}
$chr = $str[$i];
if ($chr === '"') {
break;
}
if ($chr !== '\\') {
$result .= $chr;
continue;
}
$i++;
if ($i >= $strLength) {
break;
}
$chr = $str[$i];
match ($chr) {
'"' => $result .= '"',
'\\' => $result .= '\\',
'/' => $result .= '/',
'b' => $result .= "\x08",
'f' => $result .= "\x0c",
'n' => $result .= "\x0a",
'r' => $result .= "\x0d",
't' => $result .= "\x09",
'\'' => $result .= '\'',
default => throw new RuntimeException(sprintf('Illegal escape sequence "%s"', $chr)),
};
} while ($i < $strLength);
$this->token = self::DATUM;
$this->tokenValue = $result;
break;
case 't':
if (($i + 3) < $strLength && $start === strpos($str, "true", $start)) {
$this->token = self::DATUM;
}
$this->tokenValue = true;
$i += 3;
break;
case 'f':
if (($i + 4) < $strLength && $start === strpos($str, "false", $start)) {
$this->token = self::DATUM;
}
$this->tokenValue = false;
$i += 4;
break;
case 'n':
if (($i + 3) < $strLength && $start === strpos($str, "null", $start)) {
$this->token = self::DATUM;
}
$this->tokenValue = null;
$i += 3;
break;
}
if ($this->token !== self::EOF) {
$this->offset = $i + 1; // Consume the last token character
return $this->token;
}
$chr = $str[$i];
if ($chr !== '-' && $chr !== '.' && ($chr < '0' || $chr > '9')) {
throw new RuntimeException('Illegal Token');
}
if (
preg_match('/-?([0-9])*(\.[0-9]*)?((e|E)((-|\+)?)[0-9]+)?/s', $str, $matches, PREG_OFFSET_CAPTURE, $start)
&& $matches[0][1] === $start
) {
$datum = $matches[0][0];
if (! is_numeric($datum)) {
throw new RuntimeException(sprintf('Illegal number format: %s', $datum));
}
if (preg_match('/^0\d+$/', $datum)) {
throw new RuntimeException(sprintf('Octal notation not supported by JSON (value: %o)', $datum));
}
$val = intval($datum);
$fVal = floatval($datum);
// phpcs:ignore SlevomatCodingStandard.Operators.DisallowEqualOperators.DisallowedEqualOperator
$this->tokenValue = $val == $fVal ? $val : $fVal;
$this->token = self::DATUM;
$this->offset = $start + strlen($datum);
}
return $this->token;
}
/**
* Convert a string from one UTF-16 char to one UTF-8 char.
*
* Normally should be handled by mb_convert_encoding, but provides a slower
* PHP-only method for installations that lack the multibyte string
* extension.
*
* This method is from the Solar Framework by Paul M. Jones.
*
* @link http://solarphp.com
*
* @param string $utf16 UTF-16 character
* @return string UTF-8 character
*/
protected static function utf162utf8($utf16)
{
// Check for mb extension otherwise do by hand.
if (function_exists('mb_convert_encoding')) {
return mb_convert_encoding($utf16, 'UTF-8', 'UTF-16');
}
$bytes = (ord($utf16[0]) << 8) | ord($utf16[1]);
return match (true) {
// This case should never be reached, because we are in ASCII range;
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
(0x7F & $bytes) === $bytes => chr(0x7F & $bytes),
// Return a 2-byte UTF-8 character;
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
(0x07FF & $bytes) === $bytes => chr(0xC0 | (($bytes >> 6) & 0x1F))
. chr(0x80 | ($bytes & 0x3F)),
// Return a 3-byte UTF-8 character;
// see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
(0xFFFF & $bytes) === $bytes => chr(0xE0 | (($bytes >> 12) & 0x0F))
. chr(0x80 | (($bytes >> 6) & 0x3F))
. chr(0x80 | ($bytes & 0x3F)),
// ignoring UTF-32 for now, sorry
default => '',
};
}
}