Parser::events() - Code Metrics - klkvsk/json-decode-stream - Measure and Improve Code Quality continuously with Scrutinizer

Parser::events() F
last analyzed 2021-10-31 05:51 UTC

↳ Parent: Parser

Complexity

Conditions	43
Paths	163

Size

Total Lines	183
Code Lines	133

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	95
CRAP Score	45.6046

Importance

Changes	2
Bugs	1	Features	0

Metric	Value
cc	43
eloc	133
c	2
b	1
f	0
nc	163
nop	0
dl	0
loc	183
ccs	95
cts	107
cp	0.8879
crap	45.6046
rs	2.9133

How to fix Long Method Complexity

<?php
declare(strict_types=1);

namespace JsonDecodeStream;

use Generator;
use JsonDecodeStream\Collector\Collector;
use JsonDecodeStream\Collector\CollectorInterface;
use JsonDecodeStream\Exception\ParserException;
use JsonDecodeStream\Internal\SourceBuffer;
use JsonDecodeStream\Internal\Stack;
use JsonDecodeStream\Internal\StackFrame;
use JsonDecodeStream\Source\FileSource;
use JsonDecodeStream\Source\Psr7Source;
use JsonDecodeStream\Source\SourceInterface;
use JsonDecodeStream\Source\StreamSource;
use JsonDecodeStream\Source\StringSource;
use Psr\Http\Message\StreamInterface;

class Parser
{
    /** @var SourceBuffer */
    protected $buffer;

    /** @var Stack */
    protected $stack;

    public function __construct(SourceInterface $source)
    {
        $this->buffer = new SourceBuffer($source);
    }

    public static function fromString(string $string)
    {
        return new static(new StringSource($string));
    }

    public static function fromFile(string $path)
    {
        return new static(new FileSource($path));
    }

    public static function fromStream($stream)
    {
        return new static(new StreamSource($stream));
    }

    public static function fromPsr7(StreamInterface $stream)
    {
        return new static(new Psr7Source($stream));
    }

    /**
     * @param null|string|string[]|CollectorInterface|CollectorInterface[] $selectors
     * single or coma-separated selector string
     * or custom CollectorInterface implementation
     * or array of any of both
     * or null to collect whole documents
     * @param bool                                  $objectsAsAssoc
     * @return iterable|Generator
     * @throws Exception\CollectorException
     * @throws Exception\SelectorException
     * @throws Exception\TokenizerException
     * @throws ParserException
     */
    public function items($selectors = null, bool $objectsAsAssoc = false)
    {
        if (is_string($selectors)) {
            $selectorsArray = explode(',', $selectors);
        } else if (is_array($selectors)) {
            $selectorsArray = $selectors;
        } else if ($selectors instanceof CollectorInterface) {
            $selectorsArray = [ $selectors ];
        } else if ($selectors === null) {

            $selectorsArray = [ null ];
        } else {
            throw new ParserException('Unexpected selectors are provided', ParserException::CODE_INVALID_ARGUMENT);
        }
        $collectors = [];
        foreach ($selectorsArray as $selector) {
            if (is_string($selector) || is_null($selector)) {
                $collectors[] = new Collector($selector, $objectsAsAssoc);
            } elseif ($selector instanceof CollectorInterface) {
                $collectors[] = $selector;
            } else {
                throw new ParserException(
                    'Invalid collector: '
                    . is_object($selector) ? get_class($selector) : gettype($selector),
                    ParserException::CODE_INVALID_ARGUMENT
                );
            }
        }

        foreach ($this->events() as $event) {
            foreach ($collectors as $collector) {
                $yielded = $collector->processEvent($event);
                if (is_array($yielded)) {
                    if (count($yielded) != 2) {
                        throw ParserException::unexpectedCollectorReturn($yielded, $event);
                    }
                    [ $key, $value ] = $yielded;
                    yield $key => $value;
                } else if ($yielded instanceof Generator) {
                    foreach ($yielded as $yieldedSingle) {
                        if (!is_array($yieldedSingle) || count($yieldedSingle) != 2) {
                            throw ParserException::unexpectedCollectorReturn($yielded, $event);
                        }
                        [ $key, $value ] = $yieldedSingle;
                        yield $key => $value;
                    }
                } else if ($yielded === null) {
                    continue;
                } else {
                    throw ParserException::unexpectedCollectorReturn($yielded, $event);
                }
            }
        }
    }

    /**
     * @return Generator|Event[]
     * @psalm-return \Generator<Event>
     * @throws ParserException
     * @noinspection PhpStatementHasEmptyBodyInspection
     */
    public function events(): Generator
    {
        $stack = new Stack();
        $tokens = $this->tokens();

        // shortcut to event factory
        $createEvent = function (string $eventId, $value = null) use ($stack, &$token): Event {
            return $this->createEvent($eventId, $value, $stack, $token->getLineNumber(), $token->getCharNumber());
        };

        foreach ($tokens as $token) {
            if ($token->getId() == Token::WHITESPACE) {
                // ignore whitespaces
                continue;
            }

            if ($stack->isEmpty()) {
                switch ($token->getId()) {
                    case Token::OBJECT_START:
                        yield $createEvent(Event::DOCUMENT_START);
                        yield $createEvent(Event::OBJECT_START);

                        $stack->push(StackFrame::object());
                        break;

                    case Token::ARRAY_START:
                        yield $createEvent(Event::DOCUMENT_START);
                        yield $createEvent(Event::ARRAY_START);

                        $stack->push(StackFrame::array());
                        break;

                    case Token::WHITESPACE:
                    case Token::COMA:
                        // this is ignored at top-level to parse json sequences
                        break;

                    default:
                        throw ParserException::unexpectedToken($token);
                }
                continue;
            }
            if ($stack->current()->isAwaitsComa()) {
                if ($token->getId() == Token::COMA) {
                    $stack->current()->setAwaitsComa(false);
                    if ($stack->current()->isObject()) {
                        $stack->current()->setLastKey(null);
                        $stack->current()->setAwaitsKey(true);
                    }
                    continue;
                } elseif ($stack->current()->isObject() && $token->getId() == Token::OBJECT_END) {
                    // pass
                } elseif ($stack->current()->isArray() && $token->getId() == Token::ARRAY_END) {
                    // pass
                } else {
                    throw ParserException::expectedButGot('","', $token);
                }
            }
            if ($stack->current()->isAwaitsKeyDelimiter()) {
                if ($token->getId() == Token::KEY_DELIMITER) {
                    $stack->current()->setAwaitsKeyDelimiter(false);
                    continue;
                } else {
                    throw ParserException::expectedButGot('":"', $token);
                }
            }
            if ($stack->current()->isAwaitsKey()) {
                if ($token->getId() != Token::STRING && $token->getId() != Token::OBJECT_END) {
                    throw ParserException::expectedButGot('object key', $token);
                }
            }

            if ($stack->current()->isArray()) {
                switch ($token->getId()) {
                    case Token::STRING:
                    case Token::NUMBER:
                    case Token::NULL:
                    case Token::TRUE:
                    case Token::FALSE:
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->setLastKey(
                            $stack->current()->getElementCount()
                        );
                        $stack->current()->incrementElementCount();
                        yield $createEvent(Event::VALUE, $token->getValue());
                        break;

                    case Token::ARRAY_START:
                        yield $createEvent(Event::ARRAY_START);
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->setLastKey(
                            $stack->current()->getElementCount()
                        );
                        $stack->current()->incrementElementCount();
                        $stack->push(StackFrame::array());
                        break;

                    case Token::ARRAY_END:
                        $stack->pop();
                        yield $createEvent(Event::ARRAY_END);
                        if ($stack->isEmpty()) {
                            yield $createEvent(Event::DOCUMENT_END);
                        }
                        break;

                    case Token::OBJECT_START:
                        $stack->current()->setLastKey(
                            $stack->current()->getElementCount()
                        );
                        yield $createEvent(Event::OBJECT_START);
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->incrementElementCount();
                        $stack->push(StackFrame::object());
                        break;

                    case Token::OBJECT_END:
                        $stack->pop();
                        yield $createEvent(Event::OBJECT_END);
                        break;

                    default:
                        throw ParserException::unexpectedToken($token);
                }

                continue;
            }

            if ($stack->current()->isObject()) {
                switch ($token->getId()) {
                    case Token::STRING:
                        if ($stack->current()->isAwaitsKey()) {
                            yield $createEvent(Event::KEY, $token->getValue());
                            $stack->current()->setLastKey($token->getValue());
                            $stack->current()->setAwaitsKeyDelimiter(true);
                            $stack->current()->setAwaitsKey(false);
                        } else {
                            yield $createEvent(Event::VALUE, $token->getValue());
                            $stack->current()->setAwaitsComa(true);
                            $stack->current()->incrementElementCount();
                        }
                        break;

                    case Token::NUMBER:
                    case Token::NULL:
                    case Token::TRUE:
                    case Token::FALSE:
                        yield $createEvent(Event::VALUE, $token->getValue());
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->incrementElementCount();
                        break;

                    case Token::ARRAY_START:
                        yield $createEvent(Event::ARRAY_START);
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->incrementElementCount();
                        $stack->push(StackFrame::array());
                        break;

                    case Token::ARRAY_END:
                        yield $createEvent(Event::ARRAY_END);
                        $stack->pop();
                        break;

                    case Token::OBJECT_START:
                        yield $createEvent(Event::OBJECT_START);
                        $stack->current()->setAwaitsComa(true);
                        $stack->current()->incrementElementCount();
                        $stack->push(StackFrame::object());
                        break;

                    case Token::OBJECT_END:
                        $stack->pop();
                        yield $createEvent(Event::OBJECT_END);
                        if ($stack->isEmpty()) {
                            yield $createEvent(Event::DOCUMENT_END);
                        }
                        break;

                    default:
                        throw ParserException::unexpectedToken($token);
                }

                continue;
            }
        }
    }

    /**
     * @return iterable|Tokenizer|Token[]
     */
    public function tokens(): iterable
    {
        return new Tokenizer($this->buffer);
    }

    /**
     * @param string $eventId
     * @param        $value
     * @param Stack  $stack
     * @param int    $lineNumber
     * @param int    $charNumber
     * @return Event
     */
    protected function createEvent(string $eventId, $value, Stack $stack, int $lineNumber, int $charNumber): Event
    {
        return new Event($eventId, $value, $stack, $lineNumber, $charNumber);
    }
}


1		<?php
2		declare(strict_types=1);
3
4		namespace JsonDecodeStream;
5
6		use Generator;
7		use JsonDecodeStream\Collector\Collector;
8		use JsonDecodeStream\Collector\CollectorInterface;
9		use JsonDecodeStream\Exception\ParserException;
10		use JsonDecodeStream\Internal\SourceBuffer;
11		use JsonDecodeStream\Internal\Stack;
12		use JsonDecodeStream\Internal\StackFrame;
13		use JsonDecodeStream\Source\FileSource;
14		use JsonDecodeStream\Source\Psr7Source;
15		use JsonDecodeStream\Source\SourceInterface;
16		use JsonDecodeStream\Source\StreamSource;
17		use JsonDecodeStream\Source\StringSource;
18		use Psr\Http\Message\StreamInterface;
19
20		class Parser
21		{
22		/** @var SourceBuffer */
23		protected $buffer;
24
25		/** @var Stack */
26		protected $stack;
27
28	52	public function __construct(SourceInterface $source)
29		{
30	52	$this->buffer = new SourceBuffer($source);
31	52	}
32
33	25	public static function fromString(string $string)
34		{
35	25	return new static(new StringSource($string));
36		}
37
38	35	public static function fromFile(string $path)
39		{
40	35	return new static(new FileSource($path));
41		}
42
43		public static function fromStream($stream)
44		{
45		return new static(new StreamSource($stream));
46		}
47
48		public static function fromPsr7(StreamInterface $stream)
49		{
50		return new static(new Psr7Source($stream));
51		}
52
53		/**
54		* @param null\|string\|string[]\|CollectorInterface\|CollectorInterface[] $selectors
55		* single or coma-separated selector string
56		* or custom CollectorInterface implementation
57		* or array of any of both
58		* or null to collect whole documents
59		* @param bool $objectsAsAssoc
60		* @return iterable\|Generator
61		* @throws Exception\CollectorException
62		* @throws Exception\SelectorException
63		* @throws Exception\TokenizerException
64		* @throws ParserException
65		*/
66	15	public function items($selectors = null, bool $objectsAsAssoc = false)
67		{
68	15	if (is_string($selectors)) {
69	9	$selectorsArray = explode(',', $selectors);
70	6	} else if (is_array($selectors)) {
71		$selectorsArray = $selectors;
72	6	} else if ($selectors instanceof CollectorInterface) {
73	2	$selectorsArray = [ $selectors ];
74	4	} else if ($selectors === null) {
		0 ignored issues – show introduced 2020-12-15 09:36 UTC by Report Bug Copy Issue Report The condition `$selectors === null` is always `true`. Loading history...
75	4	$selectorsArray = [ null ];
76		} else {
77		throw new ParserException('Unexpected selectors are provided', ParserException::CODE_INVALID_ARGUMENT);
78		}
79	15	$collectors = [];
80	15	foreach ($selectorsArray as $selector) {
81	15	if (is_string($selector) \|\| is_null($selector)) {
82	13	$collectors[] = new Collector($selector, $objectsAsAssoc);
83	2	} elseif ($selector instanceof CollectorInterface) {
84	2	$collectors[] = $selector;
85		} else {
86		throw new ParserException(
87		'Invalid collector: '
88		. is_object($selector) ? get_class($selector) : gettype($selector),
89		ParserException::CODE_INVALID_ARGUMENT
90		);
91		}
92		}
93
94	15	foreach ($this->events() as $event) {
95	15	foreach ($collectors as $collector) {
96	15	$yielded = $collector->processEvent($event);
97	15	if (is_array($yielded)) {
98	14	if (count($yielded) != 2) {
99		throw ParserException::unexpectedCollectorReturn($yielded, $event);
100		}
101	14	[ $key, $value ] = $yielded;
102	14	yield $key => $value;
103	15	} else if ($yielded instanceof Generator) {
104	1	foreach ($yielded as $yieldedSingle) {
105	1	if (!is_array($yieldedSingle) \|\| count($yieldedSingle) != 2) {
106		throw ParserException::unexpectedCollectorReturn($yielded, $event);
107		}
108	1	[ $key, $value ] = $yieldedSingle;
109	1	yield $key => $value;
110		}
111	14	} else if ($yielded === null) {
112	14	continue;
113		} else {
114		throw ParserException::unexpectedCollectorReturn($yielded, $event);
115		}
116		}
117		}
118	15	}
119
120		/**
121		* @return Generator\|Event[]
122		* @psalm-return \Generator<Event>
123		* @throws ParserException
124		* @noinspection PhpStatementHasEmptyBodyInspection
125		*/
126	52	public function events(): Generator
127		{
128	52	$stack = new Stack();
129	52	$tokens = $this->tokens();
130
131		// shortcut to event factory
132	52	$createEvent = function (string $eventId, $value = null) use ($stack, &$token): Event {
133	52	return $this->createEvent($eventId, $value, $stack, $token->getLineNumber(), $token->getCharNumber());
134	52	};
135
136	52	foreach ($tokens as $token) {
137	52	if ($token->getId() == Token::WHITESPACE) {
138		// ignore whitespaces
139	50	continue;
140		}
141
142	52	if ($stack->isEmpty()) {
143	52	switch ($token->getId()) {
144		case Token::OBJECT_START:
145	37	yield $createEvent(Event::DOCUMENT_START);
146	37	yield $createEvent(Event::OBJECT_START);
147
148	37	$stack->push(StackFrame::object());
149	37	break;
150
151		case Token::ARRAY_START:
152	15	yield $createEvent(Event::DOCUMENT_START);
153	15	yield $createEvent(Event::ARRAY_START);
154
155	15	$stack->push(StackFrame::array());
156	15	break;
157
158		case Token::WHITESPACE:
159		case Token::COMA:
160		// this is ignored at top-level to parse json sequences
161	2	break;
162
163		default:
164		throw ParserException::unexpectedToken($token);
165		}
166	52	continue;
167		}
168	52	if ($stack->current()->isAwaitsComa()) {
169	50	if ($token->getId() == Token::COMA) {
170	42	$stack->current()->setAwaitsComa(false);
171	42	if ($stack->current()->isObject()) {
172	29	$stack->current()->setLastKey(null);
173	29	$stack->current()->setAwaitsKey(true);
174		}
175	42	continue;
176	50	} elseif ($stack->current()->isObject() && $token->getId() == Token::OBJECT_END) {
177		// pass
178	36	} elseif ($stack->current()->isArray() && $token->getId() == Token::ARRAY_END) {
179		// pass
180		} else {
181		throw ParserException::expectedButGot('","', $token);
182		}
183		}
184	52	if ($stack->current()->isAwaitsKeyDelimiter()) {
185	42	if ($token->getId() == Token::KEY_DELIMITER) {
186	42	$stack->current()->setAwaitsKeyDelimiter(false);
187	42	continue;
188		} else {
189		throw ParserException::expectedButGot('":"', $token);
190		}
191		}
192	52	if ($stack->current()->isAwaitsKey()) {
193	43	if ($token->getId() != Token::STRING && $token->getId() != Token::OBJECT_END) {
194		throw ParserException::expectedButGot('object key', $token);
195		}
196		}
197
198	52	if ($stack->current()->isArray()) {
199	37	switch ($token->getId()) {
200		case Token::STRING:
201		case Token::NUMBER:
202		case Token::NULL:
203		case Token::TRUE:
204		case Token::FALSE:
205	35	$stack->current()->setAwaitsComa(true);
206	35	$stack->current()->setLastKey(
207	35	$stack->current()->getElementCount()
208		);
209	35	$stack->current()->incrementElementCount();
210	35	yield $createEvent(Event::VALUE, $token->getValue());
211	35	break;
212
213		case Token::ARRAY_START:
214	7	yield $createEvent(Event::ARRAY_START);
215	7	$stack->current()->setAwaitsComa(true);
216	7	$stack->current()->setLastKey(
217	7	$stack->current()->getElementCount()
218		);
219	7	$stack->current()->incrementElementCount();
220	7	$stack->push(StackFrame::array());
221	7	break;
222
223		case Token::ARRAY_END:
224	37	$stack->pop();
225	37	yield $createEvent(Event::ARRAY_END);
226	37	if ($stack->isEmpty()) {
227	15	yield $createEvent(Event::DOCUMENT_END);
228		}
229	37	break;
230
231		case Token::OBJECT_START:
232	27	$stack->current()->setLastKey(
233	27	$stack->current()->getElementCount()
234		);
235	27	yield $createEvent(Event::OBJECT_START);
236	27	$stack->current()->setAwaitsComa(true);
237	27	$stack->current()->incrementElementCount();
238	27	$stack->push(StackFrame::object());
239	27	break;
240
241		case Token::OBJECT_END:
242		$stack->pop();
243		yield $createEvent(Event::OBJECT_END);
244		break;
245
246		default:
247		throw ParserException::unexpectedToken($token);
248		}
249
250	37	continue;
251		}
252
253	43	if ($stack->current()->isObject()) {
254	43	switch ($token->getId()) {
255		case Token::STRING:
256	42	if ($stack->current()->isAwaitsKey()) {
257	42	yield $createEvent(Event::KEY, $token->getValue());
258	42	$stack->current()->setLastKey($token->getValue());
259	42	$stack->current()->setAwaitsKeyDelimiter(true);
260	42	$stack->current()->setAwaitsKey(false);
261		} else {
262	25	yield $createEvent(Event::VALUE, $token->getValue());
263	25	$stack->current()->setAwaitsComa(true);
264	25	$stack->current()->incrementElementCount();
265		}
266	42	break;
267
268		case Token::NUMBER:
269		case Token::NULL:
270		case Token::TRUE:
271		case Token::FALSE:
272	36	yield $createEvent(Event::VALUE, $token->getValue());
273	36	$stack->current()->setAwaitsComa(true);
274	36	$stack->current()->incrementElementCount();
275	36	break;
276
277		case Token::ARRAY_START:
278	28	yield $createEvent(Event::ARRAY_START);
279	28	$stack->current()->setAwaitsComa(true);
280	28	$stack->current()->incrementElementCount();
281	28	$stack->push(StackFrame::array());
282	28	break;
283
284		case Token::ARRAY_END:
285		yield $createEvent(Event::ARRAY_END);
286		$stack->pop();
287		break;
288
289		case Token::OBJECT_START:
290	27	yield $createEvent(Event::OBJECT_START);
291	27	$stack->current()->setAwaitsComa(true);
292	27	$stack->current()->incrementElementCount();
293	27	$stack->push(StackFrame::object());
294	27	break;
295
296		case Token::OBJECT_END:
297	43	$stack->pop();
298	43	yield $createEvent(Event::OBJECT_END);
299	43	if ($stack->isEmpty()) {
300	37	yield $createEvent(Event::DOCUMENT_END);
301		}
302	43	break;
303
304		default:
305		throw ParserException::unexpectedToken($token);
306		}
307
308	43	continue;
309		}
310		}
311	52	}
312
313		/**
314		* @return iterable\|Tokenizer\|Token[]
315		*/
316	52	public function tokens(): iterable
317		{
318	52	return new Tokenizer($this->buffer);
319		}
320
321		/**
322		* @param string $eventId
323		* @param $value
324		* @param Stack $stack
325		* @param int $lineNumber
326		* @param int $charNumber
327		* @return Event
328		*/
329	52	protected function createEvent(string $eventId, $value, Stack $stack, int $lineNumber, int $charNumber): Event
330		{
331	52	return new Event($eventId, $value, $stack, $lineNumber, $charNumber);
332		}
333		}
334

klkvsk / json-decode-stream

Parser::events() F last analyzed 2021-10-31 05:51 UTC

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Parser::events() F
last analyzed 2021-10-31 05:51 UTC