Json5Decoder::inlineComment() - Code Metrics - Inspection of "Fixed escaped characters" - colinodell/json5 - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 4bd364...82b0e0 )

by Colin

created 2017-11-11 14:52 UTC

Json5Decoder::inlineComment() A

↳ Parent: Json5Decoder

Complexity

Conditions	4
Paths	2

Size

Total Lines	11
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	4

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	4
eloc	7
nc	2
nop	0
dl	0
loc	11
ccs	7
cts	7
cp	1
crap	4
rs	9.2
c	1
b	0
f	0

<?php

/*
 * This file is part of the colinodell/json5 package.
 *
 * (c) Colin O'Dell <[email protected]>
 *
 * Based on the official JSON5 implementation for JavaScript (https://github.com/json5/json5)
 *  - (c) 2012-2016 Aseem Kishore and others (https://github.com/json5/json5/contributors)
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ColinODell\Json5;

final class Json5Decoder
{
    const REGEX_WHITESPACE = '/[ \t\r\n\v\f\xA0\x{FEFF}]/u';

    private $json;

    private $at = 0;

    private $lineNumber = 1;

    private $columnNumber = 1;

    private $ch;

    private $associative = false;

    private $maxDepth = 512;

    private $castBigIntToString = false;

    private $depth = 1;

    private $length;

    private $lineCache;

    /**
     * Private constructor.
     *
     * @param string $json
     * @param bool   $associative
     * @param int    $depth
     * @param bool   $castBigIntToString
     */
    private function __construct($json, $associative = false, $depth = 512, $castBigIntToString = false)
    {
        $this->json = $json;
        $this->associative = $associative;
        $this->maxDepth = $depth;
        $this->castBigIntToString = $castBigIntToString;

        $this->length = mb_strlen($json, 'utf-8');

        $this->ch = $this->charAt(0);
    }

    /**
     * Takes a JSON encoded string and converts it into a PHP variable.
     *
     * The parameters exactly match PHP's json_decode() function - see
     * http://php.net/manual/en/function.json-decode.php for more information.
     *
     * @param string $source      The JSON string being decoded.
     * @param bool   $associative When TRUE, returned objects will be converted into associative arrays.
     * @param int    $depth       User specified recursion depth.
     * @param int    $options     Bitmask of JSON decode options.
     *
     * @return mixed
     */
    public static function decode($source, $associative = false, $depth = 512, $options = 0)
    {
        $associative = $associative || ($options & JSON_OBJECT_AS_ARRAY);
        $castBigIntToString = $options & JSON_BIGINT_AS_STRING;

        $decoder = new self((string)$source, $associative, $depth, $castBigIntToString);
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);

        $result = $decoder->value();
        $decoder->white();
        if ($decoder->ch) {
            $decoder->throwSyntaxError('Syntax error');
        }

        return $result;
    }

    /**
     * @param int $at
     *
     * @return string|null
     */
    private function charAt($at)
    {
        if ($at < 0 || $at >= $this->length) {
            return null;
        }

        return mb_substr($this->json, $at, 1, 'utf-8');
    }

    /**
     * Parse the next character.
     *
     * If $c is given, the next char will only be parsed if the current
     * one matches $c.
     *
     * @param string|null $c
     *
     * @return null|string
     */
    private function next($c = null)
    {
        // If a c parameter is provided, verify that it matches the current character.
        if ($c !== null && $c !== $this->ch) {
            $this->throwSyntaxError(sprintf(
                'Expected %s instead of %s',
                self::renderChar($c),
                self::renderChar($this->ch)
            ));
        }

        // Get the next character. When there are no more characters,
        // return the empty string.
        if ($this->ch === "\n" || ($this->ch === "\r" && $this->peek() !== "\n")) {
            $this->at++;
            $this->lineNumber++;
            $this->columnNumber = 1;
        } else {
            $this->at++;
            $this->columnNumber++;
        }

        $this->ch = $this->charAt($this->at);

        return $this->ch;
    }

    /**
     * Get the next character without consuming it or
     * assigning it to the ch variable.
     *
     * @return mixed
     */
    private function peek()
    {
        return $this->charAt($this->at + 1);
    }

    /**
     * @return string
     */
    private function getLineRemainder()
    {
        // Line are separated by "\n" or "\r" without an "\n" next
        if ($this->lineCache === null) {
            $this->lineCache = preg_split('/\n|\r\n?/u', $this->json);
        }

        $line = $this->lineCache[$this->lineNumber - 1];

        return mb_substr($line, $this->columnNumber - 1);
    }

    /**
     * Attempt to match a regular expression at the current position on the current line.
     *
     * This function will not match across multiple lines.
     *
     * @param string $regex
     *
     * @return string|null
     */
    private function match($regex)
    {
        $subject = $this->getLineRemainder();

        $matches = [];
        if (!preg_match($regex, $subject, $matches, PREG_OFFSET_CAPTURE)) {
            return null;
        }

        // PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
        $offset = mb_strlen(mb_strcut($subject, 0, $matches[0][1], 'utf-8'), 'utf-8');

        // [0][0] contains the matched text

        // [0][1] contains the index of that match
        $advanceBy = $offset + mb_strlen($matches[0][0], 'utf-8');

        $this->at += $advanceBy;
        $this->columnNumber += $advanceBy;
        $this->ch = $this->charAt($this->at);

        return $matches[0][0];
    }

    /**
     * Parse an identifier.
     *
     * Normally, reserved words are disallowed here, but we
     * only use this for unquoted object keys, where reserved words are allowed,
     * so we don't check for those here. References:
     * - http://es5.github.com/#x7.6
     * - https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Core_Language_Features#Variables
     * - http://docstore.mik.ua/orelly/webprog/jscript/ch02_07.htm
     */
    private function identifier()
    {
        // @codingStandardsIgnoreStart
        // Be careful when editing this regex, there are a couple Unicode characters in between here -------------vv
        $match = $this->match('/^(?:[\$_\p{L}\p{Nl}]|\\\\u[0-9A-Fa-f]{4})(?:[\$_\p{L}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}‌‍]|\\\\u[0-9A-Fa-f]{4})*/u');
        // @codingStandardsIgnoreEnd

        if ($match === null) {
            $this->throwSyntaxError('Bad identifier as unquoted key');
        }

        // Un-escape escaped Unicode chars
        $unescaped = preg_replace_callback('/\\\\u([0-9A-Fa-f]{4})/', function ($m) {
            return self::fromCharCode($m[1]);
        }, $match);

        return $unescaped;
    }

    private function number()
    {
        $number = null;
        $sign = '';
        $string = '';
        $base = 10;

        if ($this->ch === '-' || $this->ch === '+') {
            $sign = $this->ch;
            $this->next($this->ch);
        }

        // support for Infinity
        if ($this->ch === 'I') {
            $number = $this->word();
            if ($number === null) {
                $this->throwSyntaxError('Unexpected word for number');
            }

            return ($sign === '-') ? -INF : INF;
        }

        // support for NaN
        if ($this->ch === 'N') {
            $number = $this->word();
            if ($number !== NAN) {
                $this->throwSyntaxError('expected word to be NaN');
            }

            // ignore sign as -NaN also is NaN
            return $number;
        }

        if ($this->ch === '0') {
            $string .= $this->ch;
            $this->next();
            if ($this->ch === 'x' || $this->ch === 'X') {
                $string .= $this->ch;
                $this->next();
                $base = 16;
            } elseif (is_numeric($this->ch)) {
                $this->throwSyntaxError('Octal literal');
            }
        }

        switch ($base) {
            case 10:
                if (($match = $this->match('/^\d*\.?\d*/')) !== null) {
                    $string .= $match;
                }
                if (($match = $this->match('/^[Ee][-+]?\d*/')) !== null) {
                    $string .= $match;
                }
                $number = $string;
                break;
            case 16:
                if (($match = $this->match('/^[A-Fa-f0-9]+/')) !== null) {
                    $string .= $match;
                    $number = hexdec($string);
                    break;
                }
                $this->throwSyntaxError('Bad hex number');
        }

        if ($sign === '-') {
            $number = -$number;
        }

        if (!is_numeric($number) || !is_finite($number)) {
            $this->throwSyntaxError('Bad number');
        }

        if ($this->castBigIntToString) {
            return $number;
        }

        // Adding 0 will automatically cast this to an int or float
        return $number + 0;
    }

    private function string()
    {
        if (!($this->ch === '"' || $this->ch === "'")) {
            $this->throwSyntaxError('Bad string');
        }

        $string = '';

        $delim = $this->ch;
        $this->next();
        while ($this->ch !== null) {
            if ($this->ch === $delim) {
                $this->next();

                return $string;
            } elseif ($this->ch === '\\') {
                $this->next();
                if ($this->ch === 'u') {
                    $this->next();
                    $hex = $this->match('/^[A-Fa-f0-9]{4}/');
                    if ($hex === null) {
                        break;
                    }
                    $string .= self::fromCharCode($hex);
                    continue;
                } elseif ($this->ch === "\r") {
                    if ($this->peek() === "\n") {
                        $this->next();
                    }
                } elseif (($escapee = self::getEscapee($this->ch)) !== null) {
                    $string .= $escapee;
                } else {
                    break;
                }
            } elseif ($this->ch === "\n") {
                // unescaped newlines are invalid; see:
                // https://github.com/json5/json5/issues/24
                // @todo this feels special-cased; are there other invalid unescaped chars?
                break;
            } else {
                $string .= $this->ch;
            }

            $this->next();
        }

        $this->throwSyntaxError('Bad string');
    }

    /**
     * Skip an inline comment, assuming this is one.
     *
     * The current character should be the second / character in the // pair that begins this inline comment.
     * To finish the inline comment, we look for a newline or the end of the text.
     */
    private function inlineComment()
    {
        do {
            $this->next();
            if ($this->ch === "\n" || $this->ch === "\r") {
                $this->next();

                return;
            }
        } while ($this->ch !== null);
    }

    /**
     * Skip a block comment, assuming this is one.
     *
     * The current character should be the * character in the /* pair that begins this block comment.
     * To finish the block comment, we look for an ending *​/ pair of characters,
     * but we also watch for the end of text before the comment is terminated.
     */
    private function blockComment()
    {
        do {
            $this->next();
            while ($this->ch === '*') {
                $this->next('*');
                if ($this->ch === '/') {
                    $this->next('/');

                    return;
                }
            }
        } while ($this->ch !== null);

        $this->throwSyntaxError('Unterminated block comment');
    }

    /**
     * Skip a comment, whether inline or block-level, assuming this is one.
     */
    private function comment()
    {
        // Comments always begin with a / character.
        if ($this->ch !== '/') {
            $this->throwSyntaxError('Not a comment');
        }

        $this->next('/');

        if ($this->ch === '/') {
            $this->inlineComment();
        } elseif ($this->ch === '*') {
            $this->blockComment();
        } else {
            $this->throwSyntaxError('Unrecognized comment');
        }
    }

    /**
     * Skip whitespace and comments.
     *
     * Note that we're detecting comments by only a single / character.
     * This works since regular expressions are not valid JSON(5), but this will
     * break if there are other valid values that begin with a / character!
     */
    private function white()
    {
        while ($this->ch !== null) {
            if ($this->ch === '/') {
                $this->comment();
            } elseif (preg_match(self::REGEX_WHITESPACE, $this->ch) === 1) {
                $this->next();
            } else {
                return;
            }
        }
    }

    /**
     * Matches true, false, null, etc
     */
    private function word()
    {
        switch ($this->ch) {
            case 't':
                $this->next('t');
                $this->next('r');
                $this->next('u');
                $this->next('e');
                return true;
            case 'f':
                $this->next('f');
                $this->next('a');
                $this->next('l');
                $this->next('s');
                $this->next('e');
                return false;
            case 'n':
                $this->next('n');
                $this->next('u');
                $this->next('l');
                $this->next('l');
                return null;
            case 'I':
                $this->next('I');
                $this->next('n');
                $this->next('f');
                $this->next('i');
                $this->next('n');
                $this->next('i');
                $this->next('t');
                $this->next('y');
                return INF;
            case 'N':
                $this->next('N');
                $this->next('a');
                $this->next('N');
                return NAN;
        }

        $this->throwSyntaxError('Unexpected ' . self::renderChar($this->ch));
    }

    private function arr()
    {
        $arr = [];

        if ($this->ch === '[') {
            if (++$this->depth > $this->maxDepth) {
                $this->throwSyntaxError('Maximum stack depth exceeded');
            }

            $this->next('[');
            $this->white();
            while ($this->ch !== null) {
                if ($this->ch === ']') {
                    $this->next(']');
                    $this->depth--;
                    return $arr; // Potentially empty array
                }
                // ES5 allows omitting elements in arrays, e.g. [,] and
                // [,null]. We don't allow this in JSON5.
                if ($this->ch === ',') {
                    $this->throwSyntaxError('Missing array element');
                } else {
                    $arr[] = $this->value();
                }
                $this->white();
                // If there's no comma after this value, this needs to
                // be the end of the array.
                if ($this->ch !== ',') {
                    $this->next(']');
                    $this->depth--;
                    return $arr;
                }
                $this->next(',');
                $this->white();
            }
        }

        $this->throwSyntaxError('Bad array');
    }

    /**
     * Parse an object value
     */
    private function obj()
    {
        $object = $this->associative ? [] : new \stdClass;

        if ($this->ch === '{') {
            if (++$this->depth > $this->maxDepth) {
                $this->throwSyntaxError('Maximum stack depth exceeded');
            }

            $this->next('{');
            $this->white();
            while ($this->ch) {
                if ($this->ch === '}') {
                    $this->next('}');
                    $this->depth--;
                    return $object; // Potentially empty object
                }

                // Keys can be unquoted. If they are, they need to be
                // valid JS identifiers.
                if ($this->ch === '"' || $this->ch === "'") {
                    $key = $this->string();
                } else {
                    $key = $this->identifier();
                }

                $this->white();
                $this->next(':');
                if ($this->associative) {
                    $object[$key] = $this->value();
                } else {
                    $object->{$key} = $this->value();
                }
                $this->white();
                // If there's no comma after this pair, this needs to be
                // the end of the object.
                if ($this->ch !== ',') {
                    $this->next('}');
                    $this->depth--;
                    return $object;
                }
                $this->next(',');
                $this->white();
            }
        }

        $this->throwSyntaxError('Bad object');
    }

    /**
     * Parse a JSON value.
     *
     * It could be an object, an array, a string, a number,
     * or a word.
     */
    private function value()
    {
        $this->white();
        switch ($this->ch) {
            case '{':
                return $this->obj();
            case '[':
                return $this->arr();
            case '"':
            case "'":
                return $this->string();
            case '-':
            case '+':
            case '.':
                return $this->number();
            default:
                return is_numeric($this->ch) ? $this->number() : $this->word();
        }
    }

    private function throwSyntaxError($message)
    {
        throw new SyntaxError($message, $this->lineNumber, $this->columnNumber);
    }

    private static function renderChar($chr)
    {
        return $chr === null ? 'EOF' : "'" . $chr . "'";
    }

    /**
     * @param string $hex Hex code
     *
     * @return string Unicode character
     */
    private static function fromCharCode($hex)
    {
        return mb_convert_encoding('&#' . hexdec($hex) . ';', 'UTF-8', 'HTML-ENTITIES');
    }

    /**
     * @param string $ch
     *
     * @return string|null
     */
    private static function getEscapee($ch)
    {
        switch ($ch) {
            // @codingStandardsIgnoreStart
            case "'":  return "'";
            case '"':  return '"';
            case '\\': return '\\';
            case '/':  return '/';
            case "\n": return '';
            case 'b':  return chr(8);
            case 'f':  return "\f";
            case 'n':  return "\n";
            case 'r':  return "\r";
            case 't':  return "\t";
            default:   return null;
            // @codingStandardsIgnoreEnd
        }
    }
}


1		<?php
2
3		/*
4		* This file is part of the colinodell/json5 package.
5		*
6		* (c) Colin O'Dell <[email protected]>
7		*
8		* Based on the official JSON5 implementation for JavaScript (https://github.com/json5/json5)
9		* - (c) 2012-2016 Aseem Kishore and others (https://github.com/json5/json5/contributors)
10		*
11		* For the full copyright and license information, please view the LICENSE
12		* file that was distributed with this source code.
13		*/
14
15		namespace ColinODell\Json5;
16
17		final class Json5Decoder
18		{
19		const REGEX_WHITESPACE = '/[ \t\r\n\v\f\xA0\x{FEFF}]/u';
20
21		private $json;
22
23		private $at = 0;
24
25		private $lineNumber = 1;
26
27		private $columnNumber = 1;
28
29		private $ch;
30
31		private $associative = false;
32
33		private $maxDepth = 512;
34
35		private $castBigIntToString = false;
36
37		private $depth = 1;
38
39		private $length;
40
41		private $lineCache;
42
43		/**
44		* Private constructor.
45		*
46		* @param string $json
47		* @param bool $associative
48		* @param int $depth
49		* @param bool $castBigIntToString
50		*/
51	378	private function __construct($json, $associative = false, $depth = 512, $castBigIntToString = false)
52		{
53	378	$this->json = $json;
54	378	$this->associative = $associative;
55	378	$this->maxDepth = $depth;
56	378	$this->castBigIntToString = $castBigIntToString;
57
58	378	$this->length = mb_strlen($json, 'utf-8');
59
60	378	$this->ch = $this->charAt(0);
61	378	}
62
63		/**
64		* Takes a JSON encoded string and converts it into a PHP variable.
65		*
66		* The parameters exactly match PHP's json_decode() function - see
67		* http://php.net/manual/en/function.json-decode.php for more information.
68		*
69		* @param string $source The JSON string being decoded.
70		* @param bool $associative When TRUE, returned objects will be converted into associative arrays.
71		* @param int $depth User specified recursion depth.
72		* @param int $options Bitmask of JSON decode options.
73		*
74		* @return mixed
75		*/
76	378	public static function decode($source, $associative = false, $depth = 512, $options = 0)
77		{
78	378	$associative = $associative \|\| ($options & JSON_OBJECT_AS_ARRAY);
79	378	$castBigIntToString = $options & JSON_BIGINT_AS_STRING;
80
81	378	$decoder = new self((string)$source, $associative, $depth, $castBigIntToString);
		0 ignored issues – show Documentation introduced 2017-11-11 13:06 UTC by Report Bug Copy Issue Report `$castBigIntToString` is of type `integer`, but the function expects a `boolean`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
82
83	378	$result = $decoder->value();
84	291	$decoder->white();
85	288	if ($decoder->ch) {
86	18	$decoder->throwSyntaxError('Syntax error');
87		}
88
89	270	return $result;
90		}
91
92		/**
93		* @param int $at
94		*
95		* @return string\|null
96		*/
97	378	private function charAt($at)
98		{
99	378	if ($at < 0 \|\| $at >= $this->length) {
100	282	return null;
101		}
102
103	375	return mb_substr($this->json, $at, 1, 'utf-8');
104		}
105
106		/**
107		* Parse the next character.
108		*
109		* If $c is given, the next char will only be parsed if the current
110		* one matches $c.
111		*
112		* @param string\|null $c
113		*
114		* @return null\|string
115		*/
116	348	private function next($c = null)
117		{
118		// If a c parameter is provided, verify that it matches the current character.
119	348	if ($c !== null && $c !== $this->ch) {
120	15	$this->throwSyntaxError(sprintf(
121	15	'Expected %s instead of %s',
122	15	self::renderChar($c),
123	15	self::renderChar($this->ch)
124	10	));
125		}
126
127		// Get the next character. When there are no more characters,
128		// return the empty string.
129	348	if ($this->ch === "\n" \|\| ($this->ch === "\r" && $this->peek() !== "\n")) {
130	270	$this->at++;
131	270	$this->lineNumber++;
132	270	$this->columnNumber = 1;
133	180	} else {
134	309	$this->at++;
135	309	$this->columnNumber++;
136		}
137
138	348	$this->ch = $this->charAt($this->at);
139
140	348	return $this->ch;
141		}
142
143		/**
144		* Get the next character without consuming it or
145		* assigning it to the ch variable.
146		*
147		* @return mixed
148		*/
149	12	private function peek()
150		{
151	12	return $this->charAt($this->at + 1);
152		}
153
154		/**
155		* @return string
156		*/
157	216	private function getLineRemainder()
158		{
159		// Line are separated by "\n" or "\r" without an "\n" next
160	216	if ($this->lineCache === null) {
161	216	$this->lineCache = preg_split('/\n\|\r\n?/u', $this->json);
162	144	}
163
164	216	$line = $this->lineCache[$this->lineNumber - 1];
165
166	216	return mb_substr($line, $this->columnNumber - 1);
167		}
168
169		/**
170		* Attempt to match a regular expression at the current position on the current line.
171		*
172		* This function will not match across multiple lines.
173		*
174		* @param string $regex
175		*
176		* @return string\|null
177		*/
178	216	private function match($regex)
179		{
180	216	$subject = $this->getLineRemainder();
181
182	216	$matches = [];
183	216	if (!preg_match($regex, $subject, $matches, PREG_OFFSET_CAPTURE)) {
184	114	return null;
185		}
186
187		// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
188	201	$offset = mb_strlen(mb_strcut($subject, 0, $matches[0][1], 'utf-8'), 'utf-8');
189
190		// [0][0] contains the matched text
		0 ignored issues – show Unused Code Comprehensibility introduced 2017-11-10 22:03 UTC by Report Bug Copy Issue Report `40%` of this comment could be valid code. Did you maybe forget this after debugging? Sometimes obsolete code just ends up commented out instead of removed. In this case it is better to remove the code once you have checked you do not need it. The code might also have been commented out for debugging purposes. In this case it is vital that someone uncomments it again or your project may behave in very unexpected ways in production. This check looks for comments that seem to be mostly valid code and reports them. Loading history...
191		// [0][1] contains the index of that match
192	201	$advanceBy = $offset + mb_strlen($matches[0][0], 'utf-8');
193
194	201	$this->at += $advanceBy;
195	201	$this->columnNumber += $advanceBy;
196	201	$this->ch = $this->charAt($this->at);
197
198	201	return $matches[0][0];
199		}
200
201		/**
202		* Parse an identifier.
203		*
204		* Normally, reserved words are disallowed here, but we
205		* only use this for unquoted object keys, where reserved words are allowed,
206		* so we don't check for those here. References:
207		* - http://es5.github.com/#x7.6
208		* - https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Core_Language_Features#Variables
209		* - http://docstore.mik.ua/orelly/webprog/jscript/ch02_07.htm
210		*/
211	39	private function identifier()
212		{
213		// @codingStandardsIgnoreStart
214		// Be careful when editing this regex, there are a couple Unicode characters in between here -------------vv
215	39	$match = $this->match('/^(?:[\$_\p{L}\p{Nl}]\|\\\\u[0-9A-Fa-f]{4})(?:[\$_\p{L}\p{Nl}\p{Mn}\p{Mc}\p{Nd}\p{Pc}‌‍]\|\\\\u[0-9A-Fa-f]{4})*/u');
216		// @codingStandardsIgnoreEnd
217
218	39	if ($match === null) {
219	9	$this->throwSyntaxError('Bad identifier as unquoted key');
220		}
221
222		// Un-escape escaped Unicode chars
223	30	$unescaped = preg_replace_callback('/\\\\u([0-9A-Fa-f]{4})/', function ($m) {
224	3	return self::fromCharCode($m[1]);
225	30	}, $match);
226
227	30	return $unescaped;
228		}
229
230	210	private function number()
231		{
232	210	$number = null;
233	210	$sign = '';
234	210	$string = '';
235	210	$base = 10;
236
237	210	if ($this->ch === '-' \|\| $this->ch === '+') {
238	93	$sign = $this->ch;
239	93	$this->next($this->ch);
240	62	}
241
242		// support for Infinity
243	210	if ($this->ch === 'I') {
244	6	$number = $this->word();
245	6	if ($number === null) {
246		$this->throwSyntaxError('Unexpected word for number');
247		}
248
249	6	return ($sign === '-') ? -INF : INF;
250		}
251
252		// support for NaN
253	204	if ($this->ch === 'N') {
254		$number = $this->word();
255		if ($number !== NAN) {
256		$this->throwSyntaxError('expected word to be NaN');
257		}
258
259		// ignore sign as -NaN also is NaN
260		return $number;
261		}
262
263	204	if ($this->ch === '0') {
264	105	$string .= $this->ch;
265	105	$this->next();
266	105	if ($this->ch === 'x' \|\| $this->ch === 'X') {
267	33	$string .= $this->ch;
268	33	$this->next();
269	33	$base = 16;
270	94	} elseif (is_numeric($this->ch)) {
271	30	$this->throwSyntaxError('Octal literal');
272		}
273	50	}
274
275		switch ($base) {
276	174	case 10:
277	144	if (($match = $this->match('/^\d\.?\d/')) !== null) {
278	144	$string .= $match;
279	96	}
280	144	if (($match = $this->match('/^[Ee][-+]?\d*/')) !== null) {
281	45	$string .= $match;
282	30	}
283	144	$number = $string;
284	144	break;
285	33	case 16:
286	33	if (($match = $this->match('/^[A-Fa-f0-9]+/')) !== null) {
287	30	$string .= $match;
288	30	$number = hexdec($string);
289	30	break;
290		}
291	3	$this->throwSyntaxError('Bad hex number');
292		}
293
294	171	if ($sign === '-') {
295	33	$number = -$number;
296	22	}
297
298	171	if (!is_numeric($number) \|\| !is_finite($number)) {
299	3	$this->throwSyntaxError('Bad number');
300		}
301
302	168	if ($this->castBigIntToString) {
303	3	return $number;
304		}
305
306		// Adding 0 will automatically cast this to an int or float
307	165	return $number + 0;
308		}
309
310	75	private function string()
311		{
312	75	if (!($this->ch === '"' \|\| $this->ch === "'")) {
313		$this->throwSyntaxError('Bad string');
314		}
315
316	75	$string = '';
317
318	75	$delim = $this->ch;
319	75	$this->next();
320	75	while ($this->ch !== null) {
321	75	if ($this->ch === $delim) {
322	69	$this->next();
323
324	69	return $string;
325	75	} elseif ($this->ch === '\\') {
326	27	$this->next();
327	27	if ($this->ch === 'u') {
328	6	$this->next();
329	6	$hex = $this->match('/^[A-Fa-f0-9]{4}/');
330	6	if ($hex === null) {
331	3	break;
332		}
333	3	$string .= self::fromCharCode($hex);
334	3	continue;
335	21	} elseif ($this->ch === "\r") {
336	6	if ($this->peek() === "\n") {
337	4	$this->next();
338	2	}
339	19	} elseif (($escapee = self::getEscapee($this->ch)) !== null) {
340	15	$string .= $escapee;
341	10	} else {
342	7	break;
343		}
344	75	} elseif ($this->ch === "\n") {
345		// unescaped newlines are invalid; see:
346		// https://github.com/json5/json5/issues/24
347		// @todo this feels special-cased; are there other invalid unescaped chars?
348	3	break;
349		} else {
350	75	$string .= $this->ch;
351		}
352
353	75	$this->next();
354	50	}
355
356	6	$this->throwSyntaxError('Bad string');
357		}
358
359		/**
360		* Skip an inline comment, assuming this is one.
361		*
362		* The current character should be the second / character in the // pair that begins this inline comment.
363		* To finish the inline comment, we look for a newline or the end of the text.
364		*/
365	36	private function inlineComment()
366		{
367		do {
368	36	$this->next();
369	36	if ($this->ch === "\n" \|\| $this->ch === "\r") {
370	33	$this->next();
371
372	33	return;
373		}
374	36	} while ($this->ch !== null);
375	3	}
376
377		/**
378		* Skip a block comment, assuming this is one.
379		*
380		* The current character should be the * character in the /* pair that begins this block comment.
381		* To finish the block comment, we look for an ending */ pair of characters,
382		* but we also watch for the end of text before the comment is terminated.
383		*/
384	21	private function blockComment()
385		{
386		do {
387	21	$this->next();
388	21	while ($this->ch === '*') {
389	18	$this->next('*');
390	18	if ($this->ch === '/') {
391	18	$this->next('/');
392
393	18	return;
394		}
395	2	}
396	21	} while ($this->ch !== null);
397
398	3	$this->throwSyntaxError('Unterminated block comment');
399		}
400
401		/**
402		* Skip a comment, whether inline or block-level, assuming this is one.
403		*/
404	57	private function comment()
405		{
406		// Comments always begin with a / character.
407	57	if ($this->ch !== '/') {
408		$this->throwSyntaxError('Not a comment');
409		}
410
411	57	$this->next('/');
412
413	57	if ($this->ch === '/') {
414	36	$this->inlineComment();
415	46	} elseif ($this->ch === '*') {
416	21	$this->blockComment();
417	12	} else {
418	3	$this->throwSyntaxError('Unrecognized comment');
419		}
420	51	}
421
422		/**
423		* Skip whitespace and comments.
424		*
425		* Note that we're detecting comments by only a single / character.
426		* This works since regular expressions are not valid JSON(5), but this will
427		* break if there are other valid values that begin with a / character!
428		*/
429	378	private function white()
430		{
431	378	while ($this->ch !== null) {
432	375	if ($this->ch === '/') {
433	57	$this->comment();
434	370	} elseif (preg_match(self::REGEX_WHITESPACE, $this->ch) === 1) {
435	273	$this->next();
436	182	} else {
437	366	return;
438		}
439	186	}
440	279	}
441
442		/**
443		* Matches true, false, null, etc
444		*/
445	84	private function word()
446		{
447	84	switch ($this->ch) {
448	84	case 't':
449	36	$this->next('t');
450	36	$this->next('r');
451	36	$this->next('u');
452	36	$this->next('e');
453	36	return true;
454	63	case 'f':
455	18	$this->next('f');
456	18	$this->next('a');
457	18	$this->next('l');
458	18	$this->next('s');
459	18	$this->next('e');
460	18	return false;
461	48	case 'n':
462	18	$this->next('n');
463	18	$this->next('u');
464	18	$this->next('l');
465	18	$this->next('l');
466	18	return null;
467	30	case 'I':
468	15	$this->next('I');
469	15	$this->next('n');
470	12	$this->next('f');
471	12	$this->next('i');
472	12	$this->next('n');
473	12	$this->next('i');
474	12	$this->next('t');
475	12	$this->next('y');
476	12	return INF;
477	15	case 'N':
478	6	$this->next('N');
479	6	$this->next('a');
480	3	$this->next('N');
481	3	return NAN;
482	6	}
483
484	9	$this->throwSyntaxError('Unexpected ' . self::renderChar($this->ch));
485		}
486
487	42	private function arr()
488		{
489	42	$arr = [];
490
491	42	if ($this->ch === '[') {
492	42	if (++$this->depth > $this->maxDepth) {
493	3	$this->throwSyntaxError('Maximum stack depth exceeded');
494		}
495
496	42	$this->next('[');
497	42	$this->white();
498	42	while ($this->ch !== null) {
499	42	if ($this->ch === ']') {
500	12	$this->next(']');
501	12	$this->depth--;
502	12	return $arr; // Potentially empty array
503		}
504		// ES5 allows omitting elements in arrays, e.g. [,] and
505		// [,null]. We don't allow this in JSON5.
506	39	if ($this->ch === ',') {
507	6	$this->throwSyntaxError('Missing array element');
508		} else {
509	33	$arr[] = $this->value();
510		}
511	30	$this->white();
512		// If there's no comma after this value, this needs to
513		// be the end of the array.
514	30	if ($this->ch !== ',') {
515	21	$this->next(']');
516	18	$this->depth--;
517	18	return $arr;
518		}
519	15	$this->next(',');
520	15	$this->white();
521	10	}
522		}
523
524		$this->throwSyntaxError('Bad array');
525		}
526
527		/**
528		* Parse an object value
529		*/
530	78	private function obj()
531		{
532	78	$object = $this->associative ? [] : new \stdClass;
533
534	78	if ($this->ch === '{') {
535	78	if (++$this->depth > $this->maxDepth) {
536		$this->throwSyntaxError('Maximum stack depth exceeded');
537		}
538
539	78	$this->next('{');
540	78	$this->white();
541	78	while ($this->ch) {
542	78	if ($this->ch === '}') {
543	21	$this->next('}');
544	21	$this->depth--;
545	21	return $object; // Potentially empty object
546		}
547
548		// Keys can be unquoted. If they are, they need to be
549		// valid JS identifiers.
550	66	if ($this->ch === '"' \|\| $this->ch === "'") {
551	30	$key = $this->string();
552	20	} else {
553	39	$key = $this->identifier();
554		}
555
556	57	$this->white();
557	57	$this->next(':');
558	54	if ($this->associative) {
559	45	$object[$key] = $this->value();
560	30	} else {
561	51	$object->{$key} = $this->value();
562		}
563	54	$this->white();
564		// If there's no comma after this pair, this needs to be
565		// the end of the object.
566	54	if ($this->ch !== ',') {
567	45	$this->next('}');
568	42	$this->depth--;
569	42	return $object;
570		}
571	21	$this->next(',');
572	21	$this->white();
573	14	}
574		}
575
576		$this->throwSyntaxError('Bad object');
577		}
578
579		/**
580		* Parse a JSON value.
581		*
582		* It could be an object, an array, a string, a number,
583		* or a word.
584		*/
585	378	private function value()
586		{
587	378	$this->white();
588	375	switch ($this->ch) {
589	375	case '{':
590	78	return $this->obj();
591	351	case '[':
592	42	return $this->arr();
593	339	case '"':
594	328	case "'":
595	63	return $this->string();
596	285	case '-':
597	270	case '+':
598	255	case '.':
599	102	return $this->number();
600	124	default:
601	186	return is_numeric($this->ch) ? $this->number() : $this->word();
602	124	}
603		}
604
605	108	private function throwSyntaxError($message)
606		{
607	108	throw new SyntaxError($message, $this->lineNumber, $this->columnNumber);
608		}
609
610	24	private static function renderChar($chr)
611		{
612	24	return $chr === null ? 'EOF' : "'" . $chr . "'";
613		}
614
615		/**
616		* @param string $hex Hex code
617		*
618		* @return string Unicode character
619		*/
620	6	private static function fromCharCode($hex)
621		{
622	6	return mb_convert_encoding('&#' . hexdec($hex) . ';', 'UTF-8', 'HTML-ENTITIES');
623		}
624
625		/**
626		* @param string $ch
627		*
628		* @return string\|null
629		*/
630	15	private static function getEscapee($ch)
631		{
632		switch ($ch) {
633		// @codingStandardsIgnoreStart
634	15	case "'": return "'";
635	12	case '"': return '"';
636	12	case '\\': return '\\';
637	12	case '/': return '/';
638	12	case "\n": return '';
639	3	case 'b': return chr(8);
640	3	case 'f': return "\f";
641	3	case 'n': return "\n";
642	3	case 'r': return "\r";
643	3	case 't': return "\t";
644		default: return null;
645		// @codingStandardsIgnoreEnd
646		}
647		}
648		}
649

colinodell / json5

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Json5Decoder::inlineComment() A

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