DocParser::parse() - Code Metrics - Inspection of "Allow event listeners to manipulate Markdown input..." - thephpleague/commonmark - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 40e537...652fd3 )

by Colin

created 2020-04-18 20:19 UTC

DocParser::parse() A

↳ Parent: DocParser

Complexity

Conditions	3
Paths	4

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	15
CRAP Score	3

Importance

Changes

Metric	Value
dl	0
loc	26
ccs	15
cts	15
cp	1
rs	9.504
c	0
b	0
f	0
cc	3
nc	4
nop	1
crap	3

<?php

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <[email protected]>
 *
 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\CommonMark;

use League\CommonMark\Block\Element\AbstractBlock;
use League\CommonMark\Block\Element\AbstractStringContainerBlock;
use League\CommonMark\Block\Element\Document;
use League\CommonMark\Block\Element\Paragraph;
use League\CommonMark\Block\Element\StringContainerInterface;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Event\DocumentPreParsedEvent;
use League\CommonMark\Input\MarkdownInput;

final class DocParser implements DocParserInterface
{
    /**
     * @var EnvironmentInterface
     */
    private $environment;

    /**
     * @var InlineParserEngine
     */
    private $inlineParserEngine;

    /**
     * @var int|float
     */
    private $maxNestingLevel;

    /**
     * @param EnvironmentInterface $environment
     */
    public function __construct(EnvironmentInterface $environment)
    {
        $this->environment = $environment;
        $this->inlineParserEngine = new InlineParserEngine($environment);
        $this->maxNestingLevel = $environment->getConfig('max_nesting_level', \INF);
    }

    /**
     * @param string $input
     *
     * @throws \RuntimeException
     *
     * @return Document
     */
    public function parse(string $input): Document
    {
        $document = new Document();

        $preParsedEvent = new DocumentPreParsedEvent($document, new MarkdownInput($input));
        $this->environment->dispatch($preParsedEvent);
        $markdown = $preParsedEvent->getMarkdown();

        $context = new Context($document, $this->environment);

        foreach ($markdown->getLines() as $line) {
            $context->setNextLine($line);
            $this->incorporateLine($context);
        }

        $lineCount = $markdown->getLineCount();
        while ($tip = $context->getTip()) {
            $tip->finalize($context, $lineCount);
        }

        $this->processInlines($context);

        $this->environment->dispatch(new DocumentParsedEvent($document));

        return $document;
    }

    private function incorporateLine(ContextInterface $context): void
    {
        $context->getBlockCloser()->resetTip();
        $context->setBlocksParsed(false);

        $cursor = new Cursor($context->getLine());

        $this->resetContainer($context, $cursor);
        $context->getBlockCloser()->setLastMatchedContainer($context->getContainer());

        $this->parseBlocks($context, $cursor);

        // What remains at the offset is a text line.  Add the text to the appropriate container.
        // First check for a lazy paragraph continuation:
        if ($this->handleLazyParagraphContinuation($context, $cursor)) {
            return;
        }

        // not a lazy continuation
        // finalize any blocks not matched
        $context->getBlockCloser()->closeUnmatchedBlocks();

        // Determine whether the last line is blank, updating parents as needed
        $this->setAndPropagateLastLineBlank($context, $cursor);

        // Handle any remaining cursor contents
        if ($context->getContainer() instanceof StringContainerInterface) {
            $context->getContainer()->handleRemainingContents($context, $cursor);
        } elseif (!$cursor->isBlank()) {
            // Create paragraph container for line
            $p = new Paragraph();
            $context->addBlock($p);
            $cursor->advanceToNextNonSpaceOrTab();
            $p->addLine($cursor->getRemainder());
        }
    }

    private function processInlines(ContextInterface $context): void
    {
        $walker = $context->getDocument()->walker();

        while ($event = $walker->next()) {
            if (!$event->isEntering()) {
                continue;
            }

            $node = $event->getNode();
            if ($node instanceof AbstractStringContainerBlock) {
                $this->inlineParserEngine->parse($node, $context->getDocument()->getReferenceMap());
            }
        }
    }

    /**
     * Sets the container to the last open child (or its parent)
     *
     * @param ContextInterface $context
     * @param Cursor           $cursor
     */
    private function resetContainer(ContextInterface $context, Cursor $cursor): void
    {
        $container = $context->getDocument();

        while ($lastChild = $container->lastChild()) {
            if (!($lastChild instanceof AbstractBlock)) {
                break;
            }

            if (!$lastChild->isOpen()) {
                break;
            }

            $container = $lastChild;
            if (!$container->matchesNextLine($cursor)) {
                $container = $container->parent(); // back up to the last matching block
                break;
            }
        }

        $context->setContainer($container);
    }

    /**
     * Parse blocks
     *
     * @param ContextInterface $context
     * @param Cursor           $cursor
     */
    private function parseBlocks(ContextInterface $context, Cursor $cursor): void
    {
        while (!$context->getContainer()->isCode() && !$context->getBlocksParsed()) {
            $parsed = false;
            foreach ($this->environment->getBlockParsers() as $parser) {
                if ($parser->parse($context, $cursor)) {
                    $parsed = true;
                    break;
                }
            }

            if (!$parsed || $context->getContainer() instanceof StringContainerInterface || (($tip = $context->getTip()) && $tip->getDepth() >= $this->maxNestingLevel)) {
                $context->setBlocksParsed(true);
                break;
            }
        }
    }

    private function handleLazyParagraphContinuation(ContextInterface $context, Cursor $cursor): bool
    {
        $tip = $context->getTip();

        if ($tip instanceof Paragraph &&
            !$context->getBlockCloser()->areAllClosed() &&
            !$cursor->isBlank() &&
            \count($tip->getStrings()) > 0) {

            // lazy paragraph continuation
            $tip->addLine($cursor->getRemainder());

            return true;
        }

        return false;
    }

    private function setAndPropagateLastLineBlank(ContextInterface $context, Cursor $cursor): void
    {
        $container = $context->getContainer();

        if ($cursor->isBlank() && $lastChild = $container->lastChild()) {
            if ($lastChild instanceof AbstractBlock) {
                $lastChild->setLastLineBlank(true);
            }
        }

        $lastLineBlank = $container->shouldLastLineBeBlank($cursor, $context->getLineNumber());

        // Propagate lastLineBlank up through parents:
        while ($container instanceof AbstractBlock && $container->endsWithBlankLine() !== $lastLineBlank) {
            $container->setLastLineBlank($lastLineBlank);
            $container = $container->parent();
        }
    }
}


1		<?php
2
3		/*
4		* This file is part of the league/commonmark package.
5		*
6		* (c) Colin O'Dell <[email protected]>
7		*
8		* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
9		* - (c) John MacFarlane
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 League\CommonMark;
16
17		use League\CommonMark\Block\Element\AbstractBlock;
18		use League\CommonMark\Block\Element\AbstractStringContainerBlock;
19		use League\CommonMark\Block\Element\Document;
20		use League\CommonMark\Block\Element\Paragraph;
21		use League\CommonMark\Block\Element\StringContainerInterface;
22		use League\CommonMark\Event\DocumentParsedEvent;
23		use League\CommonMark\Event\DocumentPreParsedEvent;
24		use League\CommonMark\Input\MarkdownInput;
25
26		final class DocParser implements DocParserInterface
27		{
28		/**
29		* @var EnvironmentInterface
30		*/
31		private $environment;
32
33		/**
34		* @var InlineParserEngine
35		*/
36		private $inlineParserEngine;
37
38		/**
39		* @var int\|float
40		*/
41		private $maxNestingLevel;
42
43		/**
44		* @param EnvironmentInterface $environment
45		*/
46	2505	public function __construct(EnvironmentInterface $environment)
47		{
48	2505	$this->environment = $environment;
49	2505	$this->inlineParserEngine = new InlineParserEngine($environment);
50	2505	$this->maxNestingLevel = $environment->getConfig('max_nesting_level', \INF);
51	2505	}
52
53		/**
54		* @param string $input
55		*
56		* @throws \RuntimeException
57		*
58		* @return Document
59		*/
60	2496	public function parse(string $input): Document
61		{
62	2496	$document = new Document();
63
64	2496	$preParsedEvent = new DocumentPreParsedEvent($document, new MarkdownInput($input));
65	2490	$this->environment->dispatch($preParsedEvent);
66	2490	$markdown = $preParsedEvent->getMarkdown();
67
68	2490	$context = new Context($document, $this->environment);
69
70	2490	foreach ($markdown->getLines() as $line) {
71	2490	$context->setNextLine($line);
72	2490	$this->incorporateLine($context);
73		}
74
75	2490	$lineCount = $markdown->getLineCount();
76	2490	while ($tip = $context->getTip()) {
77	2490	$tip->finalize($context, $lineCount);
78		}
79
80	2490	$this->processInlines($context);
81
82	2490	$this->environment->dispatch(new DocumentParsedEvent($document));
83
84	2487	return $document;
85		}
86
87	2490	private function incorporateLine(ContextInterface $context): void
88		{
89	2490	$context->getBlockCloser()->resetTip();
90	2490	$context->setBlocksParsed(false);
91
92	2490	$cursor = new Cursor($context->getLine());
93
94	2490	$this->resetContainer($context, $cursor);
95	2490	$context->getBlockCloser()->setLastMatchedContainer($context->getContainer());
96
97	2490	$this->parseBlocks($context, $cursor);
98
99		// What remains at the offset is a text line. Add the text to the appropriate container.
100		// First check for a lazy paragraph continuation:
101	2490	if ($this->handleLazyParagraphContinuation($context, $cursor)) {
102	36	return;
103		}
104
105		// not a lazy continuation
106		// finalize any blocks not matched
107	2490	$context->getBlockCloser()->closeUnmatchedBlocks();
108
109		// Determine whether the last line is blank, updating parents as needed
110	2490	$this->setAndPropagateLastLineBlank($context, $cursor);
111
112		// Handle any remaining cursor contents
113	2490	if ($context->getContainer() instanceof StringContainerInterface) {
114	918	$context->getContainer()->handleRemainingContents($context, $cursor);
115	2214	} elseif (!$cursor->isBlank()) {
116		// Create paragraph container for line
117	2130	$p = new Paragraph();
118	2130	$context->addBlock($p);
119	2130	$cursor->advanceToNextNonSpaceOrTab();
120	2130	$p->addLine($cursor->getRemainder());
121		}
122	2490	}
123
124	2490	private function processInlines(ContextInterface $context): void
125		{
126	2490	$walker = $context->getDocument()->walker();
127
128	2490	while ($event = $walker->next()) {
129	2490	if (!$event->isEntering()) {
130	2490	continue;
131		}
132
133	2490	$node = $event->getNode();
134	2490	if ($node instanceof AbstractStringContainerBlock) {
135	2448	$this->inlineParserEngine->parse($node, $context->getDocument()->getReferenceMap());
136		}
137		}
138	2490	}
139
140		/**
141		* Sets the container to the last open child (or its parent)
142		*
143		* @param ContextInterface $context
144		* @param Cursor $cursor
145		*/
146	2490	private function resetContainer(ContextInterface $context, Cursor $cursor): void
147		{
148	2490	$container = $context->getDocument();
149
150	2490	while ($lastChild = $container->lastChild()) {
151	1299	if (!($lastChild instanceof AbstractBlock)) {
152		break;
153		}
154
155	1299	if (!$lastChild->isOpen()) {
156	537	break;
157		}
158
159	1290	$container = $lastChild;
160	1290	if (!$container->matchesNextLine($cursor)) {
161	852	$container = $container->parent(); // back up to the last matching block
162	852	break;
163		}
164		}
165
166	2490	$context->setContainer($container);
167	2490	}
168
169		/**
170		* Parse blocks
171		*
172		* @param ContextInterface $context
173		* @param Cursor $cursor
174		*/
175	2490	private function parseBlocks(ContextInterface $context, Cursor $cursor): void
176		{
177	2490	while (!$context->getContainer()->isCode() && !$context->getBlocksParsed()) {
178	2490	$parsed = false;
179	2490	foreach ($this->environment->getBlockParsers() as $parser) {
180	2490	if ($parser->parse($context, $cursor)) {
181	972	$parsed = true;
182	972	break;
183		}
184		}
185
186	2490	if (!$parsed \|\| $context->getContainer() instanceof StringContainerInterface \|\| (($tip = $context->getTip()) && $tip->getDepth() >= $this->maxNestingLevel)) {
187	2463	$context->setBlocksParsed(true);
188	2463	break;
189		}
190		}
191	2490	}
192
193	2490	private function handleLazyParagraphContinuation(ContextInterface $context, Cursor $cursor): bool
194		{
195	2490	$tip = $context->getTip();
196
197	2490	if ($tip instanceof Paragraph &&
198	2490	!$context->getBlockCloser()->areAllClosed() &&
199	2490	!$cursor->isBlank() &&
200	2490	\count($tip->getStrings()) > 0) {
201
202		// lazy paragraph continuation
203	36	$tip->addLine($cursor->getRemainder());
204
205	36	return true;
206		}
207
208	2490	return false;
209		}
210
211	2490	private function setAndPropagateLastLineBlank(ContextInterface $context, Cursor $cursor): void
212		{
213	2490	$container = $context->getContainer();
214
215	2490	if ($cursor->isBlank() && $lastChild = $container->lastChild()) {
216	603	if ($lastChild instanceof AbstractBlock) {
217	603	$lastChild->setLastLineBlank(true);
218		}
219		}
220
221	2490	$lastLineBlank = $container->shouldLastLineBeBlank($cursor, $context->getLineNumber());
222
223		// Propagate lastLineBlank up through parents:
224	2490	while ($container instanceof AbstractBlock && $container->endsWithBlankLine() !== $lastLineBlank) {
225	753	$container->setLastLineBlank($lastLineBlank);
226	753	$container = $container->parent();
227		}
228	2490	}
229		}
230

thephpleague / commonmark

Push — master ( 40e537...652fd3 )

DocParser::parse() A

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