Decoder::getEncoding() - Code Metrics - Inspection of "Code optimization" - crossjoin/Json - Measure and Improve Code Quality continuously with Scrutinizer

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created 2016-11-10 17:34 UTC

Decoder::getEncoding() B

↳ Parent: Decoder

Complexity

Conditions	6
Paths	4

Size

Total Lines	26
Code Lines	11

Duplication

Lines	0
Ratio	0 %

Importance

Changes	3
Bugs	0	Features	0

Metric	Value
cc	6
eloc	11
c	3
b	0
f	0
nc	4
nop	1
dl	0
loc	26
rs	8.439

<?php
namespace Crossjoin\Json;

use Crossjoin\Json\Exception\EncodingNotSupportedException;
use Crossjoin\Json\Exception\InvalidArgumentException;
use Crossjoin\Json\Exception\JsonException;

/**
 * Class Decoder
 *
 * @package Crossjoin\Json
 * @author Christoph Ziegenberg <[email protected]>
 */
class Decoder extends Converter
{
    /**
     * @var bool
     */
    private $ignoreByteOrderMark = true;

    /**
     * Decoder constructor.
     *
     * @param bool $ignoreByteOrderMark
     *
     * @throws \Crossjoin\Json\Exception\InvalidArgumentException
     */
    public function __construct($ignoreByteOrderMark = true)
    {
        $this->setIgnoreByteOrderMark($ignoreByteOrderMark);
    }

    /**
     * @return boolean
     */
    public function getIgnoreByteOrderMark()
    {
        return $this->ignoreByteOrderMark;
    }

    /**
     * @param boolean $ignoreByteOrderMark
     *
     * @throws \Crossjoin\Json\Exception\InvalidArgumentException
     */
    public function setIgnoreByteOrderMark($ignoreByteOrderMark)
    {
        // Check arguments
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_BOOLEAN, 'ignoreByteOrderMark', $ignoreByteOrderMark, 1478195542);

        $this->ignoreByteOrderMark = $ignoreByteOrderMark;
    }

    /**
     * Gets the encoding of the JSON text.
     *
     * @param string $json
     *
     * @return string
     * @throws \Crossjoin\Json\Exception\InvalidArgumentException
     * @throws \Crossjoin\Json\Exception\EncodingNotSupportedException
     */
    public function getEncoding($json)
    {
        // Check arguments
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_STRING, 'json', $json, 1478195652);

        // Get the first bytes
        $bytes = $this->getEncodingBytes($json);

        // Check encoding
        foreach ($this->getEncodingPatterns() as $encoding => $regExp) {
            if (preg_match($regExp, $bytes)) {
                // Additional check, because the UTF-8 pattern also matches UTF-8 ByteOrderMarks (if ByteOrderMarks
                //have not already been removed before).
                if ($encoding !== self::UTF8 || $this->ignoreByteOrderMark || !preg_match('/^\xEF\xBB\xBF/', $bytes)) {
                    return $encoding;
                }
                break;
            }
        }

        // No encoding found
        throw new EncodingNotSupportedException(
            'The JSON text is encoded with an unsupported encoding.',
            1478092834
        );
    }

    /**
     * @return array
     */
    private function getEncodingPatterns()
    {
        return array(
            // It's UTF-8 encoded JSON if you have...
            // - 1 byte and it's not NUL ("xx")
            // - 2 bytes and none of them are NUL ("xx xx")
            // - 3 bytes and they are not NUL ("xx xx xx")
            // - 4 or more bytes and the first 4 bytes are not NUL ("xx xx xx xx")
            self::UTF8    => '/^(?:[^\x00]{1,3}$|[^\x00]{4})/',
            // It's UTF-16BE encoded JSON if you have...
            // - 2 bytes and only the first is NUL ("00 xx")
            // - 4 or more bytes and only the first byte of the first 2 bytes is NUL ("00 xx")
            self::UTF16BE => '/^(?:\x00[^\x00]{1}$|\x00[^\x00]{1}.{2})/s',
            // It's UTF-16LE encoded JSON if you have...
            // - 2 bytes and only the second is NUL ("xx 00")
            // - 4 or more bytes and only the second of the first 3 bytes is NUL ("xx 00 xx")
            self::UTF16LE => '/^(?:[^\x00]{1}\x00$|[^\x00]{1}\x00[^\x00]{1}.{1})/s',
            // It's UTF-32BE encoded JSON if you have...
            // - 4 or more bytes and only the first to third byte of the first 4 bytes are NUL ("00 00 00 xx")
            self::UTF32BE => '/^[\x00]{3}[^\x00]{1}/',
            // It's UTF-32LE encoded JSON if you have...
            // - 4 or more bytes and only the second to fourth byte of the first 4 bytes are NUL ("xx 00 00 00")
            self::UTF32LE => '/^[^\x00]{1}[\x00]{3}/',
        );
    }

    /** @noinspection MoreThanThreeArgumentsInspection */
    /**
     * Parses a valid JSON text that is encoded as UTF-8, UTF-16BE, UTF-16LE, UTF-32BE or UTF-32LE
     * and returns the data as UTF-8.
     *
     * @param string $json
     * @param bool $assoc
     * @param int $depth
     * @param int $options
     *
     * @return mixed
     * @throws \Crossjoin\Json\Exception\NativeJsonErrorException
     * @throws \Crossjoin\Json\Exception\ConversionFailedException
     * @throws \Crossjoin\Json\Exception\InvalidArgumentException
     * @throws \Crossjoin\Json\Exception\EncodingNotSupportedException
     * @throws \Crossjoin\Json\Exception\ExtensionRequiredException
     */
    public function decode($json, $assoc = false, $depth = 512, $options = 0)
    {
        // Check arguments
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_STRING, 'json', $json, 1478418105);
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_BOOLEAN, 'assoc', $assoc, 1478418106);
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_INTEGER, 'depth', $depth, 1478418107);
        InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_INTEGER, 'options', $options, 1478418108);

        // Prepare JSON data (remove BOMs and convert encoding)
        $json = $this->prepareJson($json);

        // Try to decode the json text
        // @codeCoverageIgnoreStart
        if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
            $data = \json_decode($json, $assoc, $depth, $options);
        } else {
            $data = \json_decode($json, $assoc, $depth);
        }
        // @codeCoverageIgnoreEnd

        // Check if the native JSON decoder created an error
        $this->checkForNativeJsonError();

        return $data;
    }

    /**
     * @param string $json
     *
     * @return string
     * @throws \Crossjoin\Json\Exception\InvalidArgumentException
     */
    private function getEncodingBytes($json)
    {
        // Do not use str_* function here because of possible mb_str_* overloading
        preg_match('/^(.{0,8})/s', $json, $matches);
        $bytes = array_key_exists(1, $matches) ? $matches[1] : '';

        // Remove byte order marks
        if ($this->ignoreByteOrderMark && $bytes !== '') {
            $bytes = $this->removeByteOrderMark($bytes);
        }

        return $bytes;
    }

    /**
     * @param string $json
     *
     * @return string
     */
    private function prepareJson($json)
    {
        try {
            // Ignore empty string
            // (will cause a parsing error in the native json_decode function)
            if ($json !== '') {
                // Remove byte order marks
                if ($this->ignoreByteOrderMark) {
                    $json = $this->removeByteOrderMark($json);
                }

                // Convert encoding to UTF-8
                $json = $this->convertEncoding($json, $this->getEncoding($json), self::UTF8);
            }
        } catch (JsonException $e) {
            // Ignore exception here, so that the native json_decode function
            // is called by the decode() method and we get the native error message.
        }

        return $json;
    }

    /**
     * @throws \Crossjoin\Json\Exception\NativeJsonErrorException
     */
    private function checkForNativeJsonError()
    {
        if (\json_last_error() !== \JSON_ERROR_NONE) {
            throw $this->getNativeJsonErrorException();
        }
    }
}


1			<?php
2			namespace Crossjoin\Json;
3
4			use Crossjoin\Json\Exception\EncodingNotSupportedException;
5			use Crossjoin\Json\Exception\InvalidArgumentException;
6			use Crossjoin\Json\Exception\JsonException;
7
8			/**
9			* Class Decoder
10			*
11			* @package Crossjoin\Json
12			* @author Christoph Ziegenberg <[email protected]>
13			*/
14			class Decoder extends Converter
15			{
16			/**
17			* @var bool
18			*/
19			private $ignoreByteOrderMark = true;
20
21			/**
22			* Decoder constructor.
23			*
24			* @param bool $ignoreByteOrderMark
25			*
26			* @throws \Crossjoin\Json\Exception\InvalidArgumentException
27			*/
28			public function __construct($ignoreByteOrderMark = true)
29			{
30			$this->setIgnoreByteOrderMark($ignoreByteOrderMark);
31			}
32
33			/**
34			* @return boolean
35			*/
36			public function getIgnoreByteOrderMark()
37			{
38			return $this->ignoreByteOrderMark;
39			}
40
41			/**
42			* @param boolean $ignoreByteOrderMark
43			*
44			* @throws \Crossjoin\Json\Exception\InvalidArgumentException
45			*/
46			public function setIgnoreByteOrderMark($ignoreByteOrderMark)
47			{
48			// Check arguments
49			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_BOOLEAN, 'ignoreByteOrderMark', $ignoreByteOrderMark, 1478195542);
50
51			$this->ignoreByteOrderMark = $ignoreByteOrderMark;
52			}
53
54			/**
55			* Gets the encoding of the JSON text.
56			*
57			* @param string $json
58			*
59			* @return string
60			* @throws \Crossjoin\Json\Exception\InvalidArgumentException
61			* @throws \Crossjoin\Json\Exception\EncodingNotSupportedException
62			*/
63			public function getEncoding($json)
64			{
65			// Check arguments
66			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_STRING, 'json', $json, 1478195652);
67
68			// Get the first bytes
69			$bytes = $this->getEncodingBytes($json);
70
71			// Check encoding
72			foreach ($this->getEncodingPatterns() as $encoding => $regExp) {
73			if (preg_match($regExp, $bytes)) {
74			// Additional check, because the UTF-8 pattern also matches UTF-8 ByteOrderMarks (if ByteOrderMarks
75			//have not already been removed before).
76			if ($encoding !== self::UTF8 \|\| $this->ignoreByteOrderMark \|\| !preg_match('/^\xEF\xBB\xBF/', $bytes)) {
77			return $encoding;
78			}
79			break;
80			}
81			}
82
83			// No encoding found
84			throw new EncodingNotSupportedException(
85			'The JSON text is encoded with an unsupported encoding.',
86			1478092834
87			);
88			}
89
90			/**
91			* @return array
92			*/
93			private function getEncodingPatterns()
94			{
95			return array(
96			// It's UTF-8 encoded JSON if you have...
97			// - 1 byte and it's not NUL ("xx")
98			// - 2 bytes and none of them are NUL ("xx xx")
99			// - 3 bytes and they are not NUL ("xx xx xx")
100			// - 4 or more bytes and the first 4 bytes are not NUL ("xx xx xx xx")
101			self::UTF8 => '/^(?:[^\x00]{1,3}$\|[^\x00]{4})/',
102			// It's UTF-16BE encoded JSON if you have...
103			// - 2 bytes and only the first is NUL ("00 xx")
104			// - 4 or more bytes and only the first byte of the first 2 bytes is NUL ("00 xx")
105			self::UTF16BE => '/^(?:\x00[^\x00]{1}$\|\x00[^\x00]{1}.{2})/s',
106			// It's UTF-16LE encoded JSON if you have...
107			// - 2 bytes and only the second is NUL ("xx 00")
108			// - 4 or more bytes and only the second of the first 3 bytes is NUL ("xx 00 xx")
109			self::UTF16LE => '/^(?:[^\x00]{1}\x00$\|[^\x00]{1}\x00[^\x00]{1}.{1})/s',
110			// It's UTF-32BE encoded JSON if you have...
111			// - 4 or more bytes and only the first to third byte of the first 4 bytes are NUL ("00 00 00 xx")
112			self::UTF32BE => '/^[\x00]{3}[^\x00]{1}/',
113			// It's UTF-32LE encoded JSON if you have...
114			// - 4 or more bytes and only the second to fourth byte of the first 4 bytes are NUL ("xx 00 00 00")
115			self::UTF32LE => '/^[^\x00]{1}[\x00]{3}/',
116			);
117			}
118
119			/** @noinspection MoreThanThreeArgumentsInspection */
120			/**
121			* Parses a valid JSON text that is encoded as UTF-8, UTF-16BE, UTF-16LE, UTF-32BE or UTF-32LE
122			* and returns the data as UTF-8.
123			*
124			* @param string $json
125			* @param bool $assoc
126			* @param int $depth
127			* @param int $options
128			*
129			* @return mixed
130			* @throws \Crossjoin\Json\Exception\NativeJsonErrorException
131			* @throws \Crossjoin\Json\Exception\ConversionFailedException
132			* @throws \Crossjoin\Json\Exception\InvalidArgumentException
133			* @throws \Crossjoin\Json\Exception\EncodingNotSupportedException
134			* @throws \Crossjoin\Json\Exception\ExtensionRequiredException
135			*/
136			public function decode($json, $assoc = false, $depth = 512, $options = 0)
137			{
138			// Check arguments
139			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_STRING, 'json', $json, 1478418105);
140			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_BOOLEAN, 'assoc', $assoc, 1478418106);
141			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_INTEGER, 'depth', $depth, 1478418107);
142			InvalidArgumentException::validateArgument(InvalidArgumentException::TYPE_INTEGER, 'options', $options, 1478418108);
143
144			// Prepare JSON data (remove BOMs and convert encoding)
145			$json = $this->prepareJson($json);
146
147			// Try to decode the json text
148			// @codeCoverageIgnoreStart
149			if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
150			$data = \json_decode($json, $assoc, $depth, $options);
151			} else {
152			$data = \json_decode($json, $assoc, $depth);
153			}
154			// @codeCoverageIgnoreEnd
155
156			// Check if the native JSON decoder created an error
157			$this->checkForNativeJsonError();
158
159			return $data;
160			}
161
162			/**
163			* @param string $json
164			*
165			* @return string
166			* @throws \Crossjoin\Json\Exception\InvalidArgumentException
167			*/
168			private function getEncodingBytes($json)
169			{
170			// Do not use str_* function here because of possible mb_str_* overloading
171			preg_match('/^(.{0,8})/s', $json, $matches);
172			$bytes = array_key_exists(1, $matches) ? $matches[1] : '';
173
174			// Remove byte order marks
175			if ($this->ignoreByteOrderMark && $bytes !== '') {
176			$bytes = $this->removeByteOrderMark($bytes);
177			}
178
179			return $bytes;
180			}
181
182			/**
183			* @param string $json
184			*
185			* @return string
186			*/
187			private function prepareJson($json)
188			{
189			try {
190			// Ignore empty string
191			// (will cause a parsing error in the native json_decode function)
192			if ($json !== '') {
193			// Remove byte order marks
194			if ($this->ignoreByteOrderMark) {
195			$json = $this->removeByteOrderMark($json);
196			}
197
198			// Convert encoding to UTF-8
199			$json = $this->convertEncoding($json, $this->getEncoding($json), self::UTF8);
200			}
201			} catch (JsonException $e) {
202			// Ignore exception here, so that the native json_decode function
203			// is called by the decode() method and we get the native error message.
204			}
205
206			return $json;
207			}
208
209			/**
210			* @throws \Crossjoin\Json\Exception\NativeJsonErrorException
211			*/
212			private function checkForNativeJsonError()
213			{
214			if (\json_last_error() !== \JSON_ERROR_NONE) {
215			throw $this->getNativeJsonErrorException();
216			}
217			}
218			}
219

crossjoin / Json

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Decoder::getEncoding() B

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