Cursor::isBlank() - Code Metrics - Inspection of "Apply stricter coding standard (#435)" - thephpleague/commonmark - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( d4d1b7...0de0ea )

by Colin

created 2020-05-09 22:53 UTC

Cursor::isBlank() A

↳ Parent: Cursor

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	4
ccs	2
cts	2
cp	1
rs	10
c	0
b	0
f	0
cc	2
nc	2
nop	0
crap	2

<?php

declare(strict_types=1);

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\CommonMark\Parser;

class Cursor
{
    public const INDENT_LEVEL = 4;

    /** @var string */
    private $line;

    /** @var int */
    private $length;

    /**
     * @var int
     *
     * It's possible for this to be 1 char past the end, meaning we've parsed all chars and have
     * reached the end.  In this state, any character-returning method MUST return null.
     */
    private $currentPosition = 0;

    /** @var int */
    private $column = 0;

    /** @var int */
    private $indent = 0;

    /** @var int */
    private $previousPosition = 0;

    /** @var int|null */
    private $nextNonSpaceCache;

    /** @var bool */
    private $partiallyConsumedTab = false;

    /** @var bool */
    private $lineContainsTabs;

    /** @var bool */
    private $isMultibyte;

    /** @var array<int, string> */
    private $charCache = [];

    /**
     * @param string $line The line being parsed (ASCII or UTF-8)
     */
    public function __construct(string $line)
    {
        $this->line             = $line;
        $this->length           = \mb_strlen($line, 'UTF-8') ?: 0;
        $this->isMultibyte      = $this->length !== \strlen($line);
        $this->lineContainsTabs = \strpos($line, "\t") !== false;
    }

    /**
     * Returns the position of the next character which is not a space (or tab)
     */
    public function getNextNonSpacePosition(): int
    {
        if ($this->nextNonSpaceCache !== null) {
            return $this->nextNonSpaceCache;
        }

        $i    = $this->currentPosition;
        $cols = $this->column;

        while (($c = $this->getCharacter($i)) !== null) {
            if ($c === ' ') {
                $i++;
                $cols++;
            } elseif ($c === "\t") {
                $i++;
                $cols += 4 - ($cols % 4);
            } else {
                break;
            }
        }

        $nextNonSpace = $c === null ? $this->length : $i;
        $this->indent = $cols - $this->column;

        return $this->nextNonSpaceCache = $nextNonSpace;
    }

    /**
     * Returns the next character which isn't a space (or tab)
     */
    public function getNextNonSpaceCharacter(): ?string
    {
        return $this->getCharacter($this->getNextNonSpacePosition());
    }

    /**
     * Calculates the current indent (number of spaces after current position)
     */
    public function getIndent(): int
    {
        if ($this->nextNonSpaceCache === null) {
            $this->getNextNonSpacePosition();
        }

        return $this->indent;
    }

    /**
     * Whether the cursor is indented to INDENT_LEVEL
     */
    public function isIndented(): bool
    {
        return $this->getIndent() >= self::INDENT_LEVEL;
    }

    public function getCharacter(?int $index = null): ?string
    {
        if ($index === null) {
            $index = $this->currentPosition;
        }

        // Index out-of-bounds, or we're at the end
        if ($index < 0 || $index >= $this->length) {
            return null;
        }

        if ($this->isMultibyte) {
            if (isset($this->charCache[$index])) {
                return $this->charCache[$index];
            }

            return $this->charCache[$index] = \mb_substr($this->line, $index, 1, 'UTF-8');
        }

        return $this->line[$index];
    }

    /**
     * Returns the next character (or null, if none) without advancing forwards
     */
    public function peek(int $offset = 1): ?string
    {
        return $this->getCharacter($this->currentPosition + $offset);
    }

    /**
     * Whether the remainder is blank
     */
    public function isBlank(): bool
    {
        return $this->nextNonSpaceCache === $this->length || $this->getNextNonSpacePosition() === $this->length;
    }

    /**
     * Move the cursor forwards
     */
    public function advance(): void
    {
        $this->advanceBy(1);
    }

    /**
     * Move the cursor forwards
     *
     * @param int  $characters       Number of characters to advance by
     * @param bool $advanceByColumns Whether to advance by columns instead of spaces
     */
    public function advanceBy(int $characters, bool $advanceByColumns = false): void
    {
        if ($characters === 0) {
            $this->previousPosition = $this->currentPosition;

            return;
        }

        $this->previousPosition  = $this->currentPosition;
        $this->nextNonSpaceCache = null;

        // Optimization to avoid tab handling logic if we have no tabs
        if (
            ! $this->lineContainsTabs || \strpos(
                $nextFewChars = $this->isMultibyte ?
                \mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
                \substr($this->line, $this->currentPosition, $characters),
                "\t"
            ) === false
        ) {
            $length                     = \min($characters, $this->length - $this->currentPosition);
            $this->partiallyConsumedTab = false;
            $this->currentPosition     += $length;
            $this->column              += $length;

            return;
        }

        if ($characters === 1 && ! empty($nextFewChars)) {
            $asArray = [$nextFewChars];
        } elseif ($this->isMultibyte) {
            /** @var string[] $asArray */
            $asArray = \preg_split('//u', $nextFewChars, -1, \PREG_SPLIT_NO_EMPTY);
        } else {
            $asArray = \str_split($nextFewChars);
        }

        foreach ($asArray as $relPos => $c) {
            if ($c === "\t") {
                $charsToTab = 4 - ($this->column % 4);
                if ($advanceByColumns) {
                    $this->partiallyConsumedTab = $charsToTab > $characters;
                    $charsToAdvance             = $charsToTab > $characters ? $characters : $charsToTab;
                    $this->column              += $charsToAdvance;
                    $this->currentPosition     += $this->partiallyConsumedTab ? 0 : 1;
                    $characters                -= $charsToAdvance;
                } else {
                    $this->partiallyConsumedTab = false;
                    $this->column              += $charsToTab;
                    $this->currentPosition++;
                    $characters--;
                }
            } else {
                $this->partiallyConsumedTab = false;
                $this->currentPosition++;
                $this->column++;
                $characters--;
            }

            if ($characters <= 0) {
                break;
            }
        }
    }

    /**
     * Advances the cursor by a single space or tab, if present
     */
    public function advanceBySpaceOrTab(): bool
    {
        $character = $this->getCharacter();

        if ($character === ' ' || $character === "\t") {
            $this->advanceBy(1, true);

            return true;
        }

        return false;
    }

    /**
     * Parse zero or more space/tab characters
     *
     * @return int Number of positions moved
     */
    public function advanceToNextNonSpaceOrTab(): int
    {
        $newPosition = $this->getNextNonSpacePosition();
        $this->advanceBy($newPosition - $this->currentPosition);
        $this->partiallyConsumedTab = false;

        return $this->currentPosition - $this->previousPosition;
    }

    /**
     * Parse zero or more space characters, including at most one newline.
     *
     * Tab characters are not parsed with this function.
     *
     * @return int Number of positions moved
     */
    public function advanceToNextNonSpaceOrNewline(): int
    {
        $remainder = $this->getRemainder();

        // Optimization: Avoid the regex if we know there are no spaces or newlines
        if (empty($remainder) || ($remainder[0] !== ' ' && $remainder[0] !== "\n")) {
            $this->previousPosition = $this->currentPosition;

            return 0;
        }

        $matches = [];
        \preg_match('/^ *(?:\n *)?/', $remainder, $matches, \PREG_OFFSET_CAPTURE);

        // [0][0] contains the matched text
        // [0][1] contains the index of that match
        $increment = $matches[0][1] + \strlen($matches[0][0]);

        $this->advanceBy($increment);

        return $this->currentPosition - $this->previousPosition;
    }

    /**
     * Move the position to the very end of the line
     *
     * @return int The number of characters moved
     */
    public function advanceToEnd(): int
    {
        $this->previousPosition  = $this->currentPosition;
        $this->nextNonSpaceCache = null;

        $this->currentPosition = $this->length;

        return $this->currentPosition - $this->previousPosition;
    }

    public function getRemainder(): string
    {
        if ($this->currentPosition >= $this->length) {
            return '';
        }

        $prefix   = '';
        $position = $this->currentPosition;
        if ($this->partiallyConsumedTab) {
            $position++;
            $charsToTab = 4 - ($this->column % 4);
            $prefix     = \str_repeat(' ', $charsToTab);
        }

        $subString = $this->isMultibyte ?
            \mb_substr($this->line, $position, null, 'UTF-8') :
            \substr($this->line, $position);

        return $prefix . $subString;
    }

    public function getLine(): string
    {
        return $this->line;
    }

    public function isAtEnd(): bool
    {
        return $this->currentPosition >= $this->length;
    }

    /**
     * Try to match a regular expression
     *
     * Returns the matching text and advances to the end of that match
     */
    public function match(string $regex): ?string
    {
        $subject = $this->getRemainder();

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

        // $matches[0][0] contains the matched text
        // $matches[0][1] contains the index of that match

        if ($this->isMultibyte) {
            // PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
            $offset      = \mb_strlen(\substr($subject, 0, $matches[0][1]), 'UTF-8');
            $matchLength = \mb_strlen($matches[0][0], 'UTF-8');
        } else {
            $offset      = $matches[0][1];
            $matchLength = \strlen($matches[0][0]);
        }

        // [0][0] contains the matched text
        // [0][1] contains the index of that match
        $this->advanceBy($offset + $matchLength);

        return $matches[0][0];
    }

    /**
     * Encapsulates the current state of this cursor in case you need to rollback later.
     *
     * WARNING: Do not parse or use the return value for ANYTHING except for
     * passing it back into restoreState(), as the number of values and their
     * contents may change in any future release without warning.
     */
    public function saveState(): CursorState
    {
        return new CursorState([
            $this->currentPosition,
            $this->previousPosition,
            $this->nextNonSpaceCache,
            $this->indent,
            $this->column,
            $this->partiallyConsumedTab,
        ]);
    }

    /**
     * Restore the cursor to a previous state.
     *
     * Pass in the value previously obtained by calling saveState().
     */
    public function restoreState(CursorState $state): void
    {
        [
            $this->currentPosition,
            $this->previousPosition,
            $this->nextNonSpaceCache,
            $this->indent,
            $this->column,
            $this->partiallyConsumedTab,
        ] = $state->toArray();
    }

    public function getPosition(): int
    {
        return $this->currentPosition;
    }

    public function getPreviousText(): string
    {
        return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, 'UTF-8');
    }

    public function getSubstring(int $start, ?int $length = null): string
    {
        if ($this->isMultibyte) {
            return \mb_substr($this->line, $start, $length, 'UTF-8');
        }

        if ($length !== null) {
            return \substr($this->line, $start, $length);
        }

        return \substr($this->line, $start);
    }

    public function getColumn(): int
    {
        return $this->column;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		/*
6		* This file is part of the league/commonmark package.
7		*
8		* (c) Colin O'Dell <[email protected]>
9		*
10		* For the full copyright and license information, please view the LICENSE
11		* file that was distributed with this source code.
12		*/
13
14		namespace League\CommonMark\Parser;
15
16		class Cursor
17		{
18		public const INDENT_LEVEL = 4;
19
20		/** @var string */
21		private $line;
22
23		/** @var int */
24		private $length;
25
26		/**
27		* @var int
28		*
29		* It's possible for this to be 1 char past the end, meaning we've parsed all chars and have
30		* reached the end. In this state, any character-returning method MUST return null.
31		*/
32		private $currentPosition = 0;
33
34		/** @var int */
35		private $column = 0;
36
37		/** @var int */
38		private $indent = 0;
39
40		/** @var int */
41		private $previousPosition = 0;
42
43		/** @var int\|null */
44		private $nextNonSpaceCache;
45
46		/** @var bool */
47		private $partiallyConsumedTab = false;
48
49		/** @var bool */
50		private $lineContainsTabs;
51
52		/** @var bool */
53		private $isMultibyte;
54
55		/** @var array<int, string> */
56		private $charCache = [];
57
58		/**
59		* @param string $line The line being parsed (ASCII or UTF-8)
60		*/
61	3000	public function __construct(string $line)
62		{
63	3000	$this->line = $line;
64	3000	$this->length = \mb_strlen($line, 'UTF-8') ?: 0;
65	3000	$this->isMultibyte = $this->length !== \strlen($line);
66	3000	$this->lineContainsTabs = \strpos($line, "\t") !== false;
67	3000	}
68
69		/**
70		* Returns the position of the next character which is not a space (or tab)
71		*/
72	2700	public function getNextNonSpacePosition(): int
73		{
74	2700	if ($this->nextNonSpaceCache !== null) {
75	2520	return $this->nextNonSpaceCache;
76		}
77
78	2700	$i = $this->currentPosition;
79	2700	$cols = $this->column;
80
81	2700	while (($c = $this->getCharacter($i)) !== null) {
82	2676	if ($c === ' ') {
83	813	$i++;
84	813	$cols++;
85	2634	} elseif ($c === "\t") {
86	36	$i++;
87	36	$cols += 4 - ($cols % 4);
88		} else {
89	2634	break;
90		}
91		}
92
93	2700	$nextNonSpace = $c === null ? $this->length : $i;
94	2700	$this->indent = $cols - $this->column;
95
96	2700	return $this->nextNonSpaceCache = $nextNonSpace;
97		}
98
99		/**
100		* Returns the next character which isn't a space (or tab)
101		*/
102	2466	public function getNextNonSpaceCharacter(): ?string
103		{
104	2466	return $this->getCharacter($this->getNextNonSpacePosition());
105		}
106
107		/**
108		* Calculates the current indent (number of spaces after current position)
109		*/
110	2580	public function getIndent(): int
111		{
112	2580	if ($this->nextNonSpaceCache === null) {
113	360	$this->getNextNonSpacePosition();
114		}
115
116	2580	return $this->indent;
117		}
118
119		/**
120		* Whether the cursor is indented to INDENT_LEVEL
121		*/
122	2520	public function isIndented(): bool
123		{
124	2520	return $this->getIndent() >= self::INDENT_LEVEL;
125		}
126
127	2760	public function getCharacter(?int $index = null): ?string
128		{
129	2760	if ($index === null) {
130	2472	$index = $this->currentPosition;
131		}
132
133		// Index out-of-bounds, or we're at the end
134	2760	if ($index < 0 \|\| $index >= $this->length) {
135	2370	return null;
136		}
137
138	2718	if ($this->isMultibyte) {
139	102	if (isset($this->charCache[$index])) {
140	48	return $this->charCache[$index];
141		}
142
143	102	return $this->charCache[$index] = \mb_substr($this->line, $index, 1, 'UTF-8');
144		}
145
146	2622	return $this->line[$index];
147		}
148
149		/**
150		* Returns the next character (or null, if none) without advancing forwards
151		*/
152	1332	public function peek(int $offset = 1): ?string
153		{
154	1332	return $this->getCharacter($this->currentPosition + $offset);
155		}
156
157		/**
158		* Whether the remainder is blank
159		*/
160	2514	public function isBlank(): bool
161		{
162	2514	return $this->nextNonSpaceCache === $this->length \|\| $this->getNextNonSpacePosition() === $this->length;
163		}
164
165		/**
166		* Move the cursor forwards
167		*/
168	513	public function advance(): void
169		{
170	513	$this->advanceBy(1);
171	513	}
172
173		/**
174		* Move the cursor forwards
175		*
176		* @param int $characters Number of characters to advance by
177		* @param bool $advanceByColumns Whether to advance by columns instead of spaces
178		*/
179	2868	public function advanceBy(int $characters, bool $advanceByColumns = false): void
180		{
181	2868	if ($characters === 0) {
182	2577	$this->previousPosition = $this->currentPosition;
183
184	2577	return;
185		}
186
187	2679	$this->previousPosition = $this->currentPosition;
188	2679	$this->nextNonSpaceCache = null;
189
190		// Optimization to avoid tab handling logic if we have no tabs
191		if (
192	2679	! $this->lineContainsTabs \|\| \strpos(
193	51	$nextFewChars = $this->isMultibyte ?
194	6	\mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
195	51	\substr($this->line, $this->currentPosition, $characters),
196	51	"\t"
197	2679	) === false
198		) {
199	2667	$length = \min($characters, $this->length - $this->currentPosition);
200	2667	$this->partiallyConsumedTab = false;
201	2667	$this->currentPosition += $length;
202	2667	$this->column += $length;
203
204	2667	return;
205		}
206
207	45	if ($characters === 1 && ! empty($nextFewChars)) {
208	18	$asArray = [$nextFewChars];
209	39	} elseif ($this->isMultibyte) {
210		/** @var string[] $asArray */
211		$asArray = \preg_split('//u', $nextFewChars, -1, \PREG_SPLIT_NO_EMPTY);
212		} else {
213	39	$asArray = \str_split($nextFewChars);
214		}
215
216	45	foreach ($asArray as $relPos => $c) {
217	45	if ($c === "\t") {
218	45	$charsToTab = 4 - ($this->column % 4);
219	45	if ($advanceByColumns) {
220	33	$this->partiallyConsumedTab = $charsToTab > $characters;
221	33	$charsToAdvance = $charsToTab > $characters ? $characters : $charsToTab;
222	33	$this->column += $charsToAdvance;
223	33	$this->currentPosition += $this->partiallyConsumedTab ? 0 : 1;
224	33	$characters -= $charsToAdvance;
225		} else {
226	18	$this->partiallyConsumedTab = false;
227	18	$this->column += $charsToTab;
228	18	$this->currentPosition++;
229	45	$characters--;
230		}
231		} else {
232	12	$this->partiallyConsumedTab = false;
233	12	$this->currentPosition++;
234	12	$this->column++;
235	12	$characters--;
236		}
237
238	45	if ($characters <= 0) {
239	45	break;
240		}
241		}
242	45	}
243
244		/**
245		* Advances the cursor by a single space or tab, if present
246		*/
247	390	public function advanceBySpaceOrTab(): bool
248		{
249	390	$character = $this->getCharacter();
250
251	390	if ($character === ' ' \|\| $character === "\t") {
252	378	$this->advanceBy(1, true);
253
254	378	return true;
255		}
256
257	294	return false;
258		}
259
260		/**
261		* Parse zero or more space/tab characters
262		*
263		* @return int Number of positions moved
264		*/
265	2532	public function advanceToNextNonSpaceOrTab(): int
266		{
267	2532	$newPosition = $this->getNextNonSpacePosition();
268	2532	$this->advanceBy($newPosition - $this->currentPosition);
269	2532	$this->partiallyConsumedTab = false;
270
271	2532	return $this->currentPosition - $this->previousPosition;
272		}
273
274		/**
275		* Parse zero or more space characters, including at most one newline.
276		*
277		* Tab characters are not parsed with this function.
278		*
279		* @return int Number of positions moved
280		*/
281	249	public function advanceToNextNonSpaceOrNewline(): int
282		{
283	249	$remainder = $this->getRemainder();
284
285		// Optimization: Avoid the regex if we know there are no spaces or newlines
286	249	if (empty($remainder) \|\| ($remainder[0] !== ' ' && $remainder[0] !== "\n")) {
287	216	$this->previousPosition = $this->currentPosition;
288
289	216	return 0;
290		}
291
292	84	$matches = [];
293	84	\preg_match('/^ (?:\n )?/', $remainder, $matches, \PREG_OFFSET_CAPTURE);
294
295		// [0][0] contains the matched text
296		// [0][1] contains the index of that match
297	84	$increment = $matches[0][1] + \strlen($matches[0][0]);
298
299	84	$this->advanceBy($increment);
300
301	84	return $this->currentPosition - $this->previousPosition;
302		}
303
304		/**
305		* Move the position to the very end of the line
306		*
307		* @return int The number of characters moved
308		*/
309	798	public function advanceToEnd(): int
310		{
311	798	$this->previousPosition = $this->currentPosition;
312	798	$this->nextNonSpaceCache = null;
313
314	798	$this->currentPosition = $this->length;
315
316	798	return $this->currentPosition - $this->previousPosition;
317		}
318
319	2634	public function getRemainder(): string
320		{
321	2634	if ($this->currentPosition >= $this->length) {
322	555	return '';
323		}
324
325	2607	$prefix = '';
326	2607	$position = $this->currentPosition;
327	2607	if ($this->partiallyConsumedTab) {
328	12	$position++;
329	12	$charsToTab = 4 - ($this->column % 4);
330	12	$prefix = \str_repeat(' ', $charsToTab);
331		}
332
333	2607	$subString = $this->isMultibyte ?
334	72	\mb_substr($this->line, $position, null, 'UTF-8') :
335	2607	\substr($this->line, $position);
336
337	2607	return $prefix . $subString;
338		}
339
340	1965	public function getLine(): string
341		{
342	1965	return $this->line;
343		}
344
345	2154	public function isAtEnd(): bool
346		{
347	2154	return $this->currentPosition >= $this->length;
348		}
349
350		/**
351		* Try to match a regular expression
352		*
353		* Returns the matching text and advances to the end of that match
354		*/
355	2352	public function match(string $regex): ?string
356		{
357	2352	$subject = $this->getRemainder();
358
359	2352	if (! \preg_match($regex, $subject, $matches, \PREG_OFFSET_CAPTURE)) {
360	909	return null;
361		}
362
363		// $matches[0][0] contains the matched text
364		// $matches[0][1] contains the index of that match
365
366	2319	if ($this->isMultibyte) {
367		// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
368	57	$offset = \mb_strlen(\substr($subject, 0, $matches[0][1]), 'UTF-8');
369	57	$matchLength = \mb_strlen($matches[0][0], 'UTF-8');
370		} else {
371	2262	$offset = $matches[0][1];
372	2262	$matchLength = \strlen($matches[0][0]);
373		}
374
375		// [0][0] contains the matched text
376		// [0][1] contains the index of that match
377	2319	$this->advanceBy($offset + $matchLength);
378
379	2319	return $matches[0][0];
380		}
381
382		/**
383		* Encapsulates the current state of this cursor in case you need to rollback later.
384		*
385		* WARNING: Do not parse or use the return value for ANYTHING except for
386		* passing it back into restoreState(), as the number of values and their
387		* contents may change in any future release without warning.
388		*/
389	1689	public function saveState(): CursorState
390		{
391	1689	return new CursorState([
392	1689	$this->currentPosition,
393	1689	$this->previousPosition,
394	1689	$this->nextNonSpaceCache,
395	1689	$this->indent,
396	1689	$this->column,
397	1689	$this->partiallyConsumedTab,
398		]);
399		}
400
401		/**
402		* Restore the cursor to a previous state.
403		*
404		* Pass in the value previously obtained by calling saveState().
405		*/
406	1596	public function restoreState(CursorState $state): void
407		{
408		[
409	1596	$this->currentPosition,
410	1596	$this->previousPosition,
411	1596	$this->nextNonSpaceCache,
412	1596	$this->indent,
413	1596	$this->column,
414	1596	$this->partiallyConsumedTab,
415	1596	] = $state->toArray();
416	1596	}
417
418	735	public function getPosition(): int
419		{
420	735	return $this->currentPosition;
421		}
422
423	399	public function getPreviousText(): string
424		{
425	399	return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, 'UTF-8');
426		}
427
428	426	public function getSubstring(int $start, ?int $length = null): string
429		{
430	426	if ($this->isMultibyte) {
431	21	return \mb_substr($this->line, $start, $length, 'UTF-8');
432		}
433
434	405	if ($length !== null) {
435	402	return \substr($this->line, $start, $length);
436		}
437
438	3	return \substr($this->line, $start);
439		}
440
441	285	public function getColumn(): int
442		{
443	285	return $this->column;
444		}
445		}
446

thephpleague / commonmark

Push — master ( d4d1b7...0de0ea )

Cursor::isBlank() A

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