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<?php
/*
* This file is part of the JSON Lint package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Seld\JsonLint;
use stdClass;
/**
* Parser class
*
* Example:
*
* $parser = new JsonParser();
* // returns null if it's valid json, or an error object
* $parser->lint($json);
* // returns parsed json, like json_decode does, but slower, throws exceptions on failure.
* $parser->parse($json);
*
* Ported from https://github.com/zaach/jsonlint
*/
class JsonParser
{
const DETECT_KEY_CONFLICTS = 1;
const ALLOW_DUPLICATE_KEYS = 2;
const PARSE_TO_ASSOC = 4;
private $lexer;
private $flags;
private $stack;
private $vstack; // semantic value stack
private $lstack; // location stack
/**
* @phpstan-var array<string, int>
*/
private $symbols = array(
'error' => 2,
'JSONString' => 3,
'STRING' => 4,
'JSONNumber' => 5,
'NUMBER' => 6,
'JSONNullLiteral' => 7,
'NULL' => 8,
'JSONBooleanLiteral' => 9,
'TRUE' => 10,
'FALSE' => 11,
'JSONText' => 12,
'JSONValue' => 13,
'EOF' => 14,
'JSONObject' => 15,
'JSONArray' => 16,
'{' => 17,
'}' => 18,
'JSONMemberList' => 19,
'JSONMember' => 20,
':' => 21,
',' => 22,
'[' => 23,
']' => 24,
'JSONElementList' => 25,
'$accept' => 0,
'$end' => 1,
);
/**
* @phpstan-var array<int, string>
*/
private $terminals_ = array(
2 => "error",
4 => "STRING",
6 => "NUMBER",
8 => "NULL",
10 => "TRUE",
11 => "FALSE",
14 => "EOF",
17 => "{",
18 => "}",
21 => ":",
22 => ",",
23 => "[",
24 => "]",
);
private $productions_ = array(
0,
array(3, 1),
array(5, 1),
array(7, 1),
array(9, 1),
array(9, 1),
array(12, 2),
array(13, 1),
array(13, 1),
array(13, 1),
array(13, 1),
array(13, 1),
array(13, 1),
array(15, 2),
array(15, 3),
array(20, 3),
array(19, 1),
array(19, 3),
array(16, 2),
array(16, 3),
array(25, 1),
array(25, 3)
);
private $table = array(array(3 => 5, 4 => array(1,12), 5 => 6, 6 => array(1,13), 7 => 3, 8 => array(1,9), 9 => 4, 10 => array(1,10), 11 => array(1,11), 12 => 1, 13 => 2, 15 => 7, 16 => 8, 17 => array(1,14), 23 => array(1,15)), array( 1 => array(3)), array( 14 => array(1,16)), array( 14 => array(2,7), 18 => array(2,7), 22 => array(2,7), 24 => array(2,7)), array( 14 => array(2,8), 18 => array(2,8), 22 => array(2,8), 24 => array(2,8)), array( 14 => array(2,9), 18 => array(2,9), 22 => array(2,9), 24 => array(2,9)), array( 14 => array(2,10), 18 => array(2,10), 22 => array(2,10), 24 => array(2,10)), array( 14 => array(2,11), 18 => array(2,11), 22 => array(2,11), 24 => array(2,11)), array( 14 => array(2,12), 18 => array(2,12), 22 => array(2,12), 24 => array(2,12)), array( 14 => array(2,3), 18 => array(2,3), 22 => array(2,3), 24 => array(2,3)), array( 14 => array(2,4), 18 => array(2,4), 22 => array(2,4), 24 => array(2,4)), array( 14 => array(2,5), 18 => array(2,5), 22 => array(2,5), 24 => array(2,5)), array( 14 => array(2,1), 18 => array(2,1), 21 => array(2,1), 22 => array(2,1), 24 => array(2,1)), array( 14 => array(2,2), 18 => array(2,2), 22 => array(2,2), 24 => array(2,2)), array( 3 => 20, 4 => array(1,12), 18 => array(1,17), 19 => 18, 20 => 19 ), array( 3 => 5, 4 => array(1,12), 5 => 6, 6 => array(1,13), 7 => 3, 8 => array(1,9), 9 => 4, 10 => array(1,10), 11 => array(1,11), 13 => 23, 15 => 7, 16 => 8, 17 => array(1,14), 23 => array(1,15), 24 => array(1,21), 25 => 22 ), array( 1 => array(2,6)), array( 14 => array(2,13), 18 => array(2,13), 22 => array(2,13), 24 => array(2,13)), array( 18 => array(1,24), 22 => array(1,25)), array( 18 => array(2,16), 22 => array(2,16)), array( 21 => array(1,26)), array( 14 => array(2,18), 18 => array(2,18), 22 => array(2,18), 24 => array(2,18)), array( 22 => array(1,28), 24 => array(1,27)), array( 22 => array(2,20), 24 => array(2,20)), array( 14 => array(2,14), 18 => array(2,14), 22 => array(2,14), 24 => array(2,14)), array( 3 => 20, 4 => array(1,12), 20 => 29 ), array( 3 => 5, 4 => array(1,12), 5 => 6, 6 => array(1,13), 7 => 3, 8 => array(1,9), 9 => 4, 10 => array(1,10), 11 => array(1,11), 13 => 30, 15 => 7, 16 => 8, 17 => array(1,14), 23 => array(1,15)), array( 14 => array(2,19), 18 => array(2,19), 22 => array(2,19), 24 => array(2,19)), array( 3 => 5, 4 => array(1,12), 5 => 6, 6 => array(1,13), 7 => 3, 8 => array(1,9), 9 => 4, 10 => array(1,10), 11 => array(1,11), 13 => 31, 15 => 7, 16 => 8, 17 => array(1,14), 23 => array(1,15)), array( 18 => array(2,17), 22 => array(2,17)), array( 18 => array(2,15), 22 => array(2,15)), array( 22 => array(2,21), 24 => array(2,21)),
);
private $defaultActions = array(
16 => array(2, 6)
);
/**
* @param string $input JSON string
* @param int $flags Bitmask of parse/lint options (see constants of this class)
* @return null|ParsingException null if no error is found, a ParsingException containing all details otherwise
*/
public function lint($input, $flags = 0)
{
try {
$this->parse($input, $flags);
} catch (ParsingException $e) {
return $e;
}
return null;
}
/**
* @param string $input JSON string
* @param int $flags Bitmask of parse/lint options (see constants of this class)
* @return mixed
* @throws ParsingException
*/
public function parse($input, $flags = 0)
{
$this->failOnBOM($input);
$this->flags = $flags;
$this->stack = array(0);
$this->vstack = array(null);
$this->lstack = array();
$yytext = '';
$yylineno = 0;
$yyleng = 0;
$recovering = 0;
$TERROR = 2;
$EOF = 1;
$this->lexer = new Lexer();
$this->lexer->setInput($input);
$yyloc = $this->lexer->yylloc;
$this->lstack[] = $yyloc;
$symbol = null;
$preErrorSymbol = null;
$state = null;
$action = null;
$a = null;
$r = null;
$yyval = new stdClass;
$p = null;
$len = null;
$newState = null;
$expected = null;
$errStr = null;
while (true) {
// retrieve state number from top of stack
$state = $this->stack[\count($this->stack)-1];
// use default actions if available
if (isset($this->defaultActions[$state])) {
$action = $this->defaultActions[$state];
} else {
if ($symbol == null) {
$symbol = $this->lex();
}
// read action for current state and first input
$action = isset($this->table[$state][$symbol]) ? $this->table[$state][$symbol] : false;
}
// handle parse error
if (!$action || !$action[0]) {
if (!$recovering) {
// Report error
$expected = array();
foreach ($this->table[$state] as $p => $ignore) {
if (isset($this->terminals_[$p]) && $p > 2) {
$expected[] = "'" . $this->terminals_[$p] . "'";
}
}
$message = null;
if (\in_array("'STRING'", $expected) && \in_array(substr($this->lexer->match, 0, 1), array('"', "'"))) {
$message = "Invalid string";
if ("'" === substr($this->lexer->match, 0, 1)) {
$message .= ", it appears you used single quotes instead of double quotes";
} elseif (preg_match('{".+?(\\\\[^"bfnrt/\\\\u](...)?)}', $this->lexer->getFullUpcomingInput(), $match)) {
$message .= ", it appears you have an unescaped backslash at: ".$match[1];
} elseif (preg_match('{"(?:[^"]+|\\\\")*$}m', $this->lexer->getFullUpcomingInput())) {
$message .= ", it appears you forgot to terminate a string, or attempted to write a multiline string which is invalid";
}
}
$errStr = 'Parse error on line ' . ($yylineno+1) . ":\n";
$errStr .= $this->lexer->showPosition() . "\n";
if ($message) {
$errStr .= $message;
} else {
$errStr .= (\count($expected) > 1) ? "Expected one of: " : "Expected: ";
$errStr .= implode(', ', $expected);
}
if (',' === substr(trim($this->lexer->getPastInput()), -1)) {
$errStr .= " - It appears you have an extra trailing comma";
}
$this->parseError($errStr, array(
'text' => $this->lexer->match,
'token' => !empty($this->terminals_[$symbol]) ? $this->terminals_[$symbol] : $symbol,
'line' => $this->lexer->yylineno,
'loc' => $yyloc,
'expected' => $expected,
));
}
// just recovered from another error
if ($recovering == 3) {
if ($symbol == $EOF) {
throw new ParsingException($errStr ?: 'Parsing halted.');
}
// discard current lookahead and grab another
$yyleng = $this->lexer->yyleng;
$yytext = $this->lexer->yytext;
$yylineno = $this->lexer->yylineno;
$yyloc = $this->lexer->yylloc;
$symbol = $this->lex();
}
// try to recover from error
while (true) {
// check for error recovery rule in this state
if (\array_key_exists($TERROR, $this->table[$state])) {
break;
}
if ($state == 0) {
throw new ParsingException($errStr ?: 'Parsing halted.');
}
$this->popStack(1);
$state = $this->stack[\count($this->stack)-1];
}
$preErrorSymbol = $symbol; // save the lookahead token
$symbol = $TERROR; // insert generic error symbol as new lookahead
$state = $this->stack[\count($this->stack)-1];
$action = isset($this->table[$state][$TERROR]) ? $this->table[$state][$TERROR] : false;
$recovering = 3; // allow 3 real symbols to be shifted before reporting a new error
}
// this shouldn't happen, unless resolve defaults are off
if (\is_array($action[0]) && \count($action) > 1) {
throw new ParsingException('Parse Error: multiple actions possible at state: ' . $state . ', token: ' . $symbol);
}
switch ($action[0]) {
case 1: // shift
$this->stack[] = $symbol;
$this->vstack[] = $this->lexer->yytext;
$this->lstack[] = $this->lexer->yylloc;
$this->stack[] = $action[1]; // push state
$symbol = null;
if (!$preErrorSymbol) { // normal execution/no error
$yyleng = $this->lexer->yyleng;
$yytext = $this->lexer->yytext;
$yylineno = $this->lexer->yylineno;
$yyloc = $this->lexer->yylloc;
if ($recovering > 0) {
$recovering--;
}
} else { // error just occurred, resume old lookahead f/ before error
$symbol = $preErrorSymbol;
$preErrorSymbol = null;
}
break;
case 2: // reduce
$len = $this->productions_[$action[1]][1];
// perform semantic action
$yyval->token = $this->vstack[\count($this->vstack) - $len]; // default to $$ = $1
// default location, uses first token for firsts, last for lasts
$yyval->store = array( // _$ = store
'first_line' => $this->lstack[\count($this->lstack) - ($len ?: 1)]['first_line'],
'last_line' => $this->lstack[\count($this->lstack) - 1]['last_line'],
'first_column' => $this->lstack[\count($this->lstack) - ($len ?: 1)]['first_column'],
'last_column' => $this->lstack[\count($this->lstack) - 1]['last_column'],
);
$r = $this->performAction($yyval, $yytext, $yyleng, $yylineno, $action[1], $this->vstack);
if (!$r instanceof Undefined) {
return $r;
}
if ($len) {
$this->popStack($len);
}
$this->stack[] = $this->productions_[$action[1]][0]; // push nonterminal (reduce)
$this->vstack[] = $yyval->token;
$this->lstack[] = $yyval->store;
$newState = $this->table[$this->stack[\count($this->stack)-2]][$this->stack[\count($this->stack)-1]];
$this->stack[] = $newState;
break;
case 3: // accept
return true;
}
}
}
protected function parseError($str, $hash)
{
throw new ParsingException($str, $hash);
}
// $$ = $tokens // needs to be passed by ref?
// $ = $token
// _$ removed, useless?
private function performAction(stdClass $yyval, $yytext, $yyleng, $yylineno, $yystate, &$tokens)
{
// $0 = $len
$len = \count($tokens) - 1;
switch ($yystate) {
case 1:
$yytext = preg_replace_callback('{(?:\\\\["bfnrt/\\\\]|\\\\u[a-fA-F0-9]{4})}', array($this, 'stringInterpolation'), $yytext);
$yyval->token = $yytext;
break;
case 2:
if (strpos($yytext, 'e') !== false || strpos($yytext, 'E') !== false) {
$yyval->token = \floatval($yytext);
} else {
$yyval->token = strpos($yytext, '.') === false ? \intval($yytext) : \floatval($yytext);
}
break;
case 3:
$yyval->token = null;
break;
case 4:
$yyval->token = true;
break;
case 5:
$yyval->token = false;
break;
case 6:
return $yyval->token = $tokens[$len-1];
case 13:
if ($this->flags & self::PARSE_TO_ASSOC) {
$yyval->token = array();
} else {
$yyval->token = new stdClass;
}
break;
case 14:
$yyval->token = $tokens[$len-1];
break;
case 15:
$yyval->token = array($tokens[$len-2], $tokens[$len]);
break;
case 16:
if (PHP_VERSION_ID < 70100) {
$property = $tokens[$len][0] === '' ? '_empty_' : $tokens[$len][0];
} else {
$property = $tokens[$len][0];
}
if ($this->flags & self::PARSE_TO_ASSOC) {
$yyval->token = array();
$yyval->token[$property] = $tokens[$len][1];
} else {
$yyval->token = new stdClass;
$yyval->token->$property = $tokens[$len][1];
}
break;
case 17:
if ($this->flags & self::PARSE_TO_ASSOC) {
$yyval->token =& $tokens[$len-2];
$key = $tokens[$len][0];
if (($this->flags & self::DETECT_KEY_CONFLICTS) && isset($tokens[$len-2][$key])) {
$errStr = 'Parse error on line ' . ($yylineno+1) . ":\n";
$errStr .= $this->lexer->showPosition() . "\n";
$errStr .= "Duplicate key: ".$tokens[$len][0];
throw new DuplicateKeyException($errStr, $tokens[$len][0], array('line' => $yylineno+1));
} elseif (($this->flags & self::ALLOW_DUPLICATE_KEYS) && isset($tokens[$len-2][$key])) {
$duplicateCount = 1;
do {
$duplicateKey = $key . '.' . $duplicateCount++;
} while (isset($tokens[$len-2][$duplicateKey]));
$key = $duplicateKey;
}
$tokens[$len-2][$key] = $tokens[$len][1];
} else {
$yyval->token = $tokens[$len-2];
if (PHP_VERSION_ID < 70100) {
$key = $tokens[$len][0] === '' ? '_empty_' : $tokens[$len][0];
} else {
$key = $tokens[$len][0];
}
if (($this->flags & self::DETECT_KEY_CONFLICTS) && isset($tokens[$len-2]->{$key})) {
$errStr = 'Parse error on line ' . ($yylineno+1) . ":\n";
$errStr .= $this->lexer->showPosition() . "\n";
$errStr .= "Duplicate key: ".$tokens[$len][0];
throw new DuplicateKeyException($errStr, $tokens[$len][0], array('line' => $yylineno+1));
} elseif (($this->flags & self::ALLOW_DUPLICATE_KEYS) && isset($tokens[$len-2]->{$key})) {
$duplicateCount = 1;
do {
$duplicateKey = $key . '.' . $duplicateCount++;
} while (isset($tokens[$len-2]->$duplicateKey));
$key = $duplicateKey;
}
$tokens[$len-2]->$key = $tokens[$len][1];
}
break;
case 18:
$yyval->token = array();
break;
case 19:
$yyval->token = $tokens[$len-1];
break;
case 20:
$yyval->token = array($tokens[$len]);
break;
case 21:
$tokens[$len-2][] = $tokens[$len];
$yyval->token = $tokens[$len-2];
break;
}
return new Undefined();
}
private function stringInterpolation($match)
{
switch ($match[0]) {
case '\\\\':
return '\\';
case '\"':
return '"';
case '\b':
return \chr(8);
case '\f':
return \chr(12);
case '\n':
return "\n";
case '\r':
return "\r";
case '\t':
return "\t";
case '\/':
return "/";
default:
return html_entity_decode('&#x'.ltrim(substr($match[0], 2), '0').';', ENT_QUOTES, 'UTF-8');
}
}
private function popStack($n)
{
$this->stack = \array_slice($this->stack, 0, - (2 * $n));
$this->vstack = \array_slice($this->vstack, 0, - $n);
$this->lstack = \array_slice($this->lstack, 0, - $n);
}
private function lex()
{
$token = $this->lexer->lex() ?: 1; // $end = 1
// if token isn't its numeric value, convert
if (!is_numeric($token)) {
$token = isset($this->symbols[$token]) ? $this->symbols[$token] : $token;
}
return $token;
}
private function failOnBOM($input)
{
// UTF-8 ByteOrderMark sequence
$bom = "\xEF\xBB\xBF";
if (substr($input, 0, 3) === $bom) {
$this->parseError("BOM detected, make sure your input does not include a Unicode Byte-Order-Mark", array());
}
}
}
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