Cursor::advance() - Code Metrics - Inspection of "Merge branch '1.4'" - thephpleague/commonmark - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 9eb60a...7a0a03 )

by Colin

created 2020-04-24 13:50 UTC

Cursor::advance() A

↳ Parent: Cursor

Complexity

Conditions	1
Paths	1

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes

Metric	Value
dl	0
loc	4
ccs	3
cts	3
cp	1
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	0
crap	1

<?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);
        $this->lineContainsTabs = false !== \strpos($line, "\t");
    }

    /**
     * Returns the position of the next character which is not a space (or tab)
     *
     * @return int
     */
    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)
     *
     * @return string
     */
    public function getNextNonSpaceCharacter(): ?string
    {
        return $this->getCharacter($this->getNextNonSpacePosition());
    }

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

        return $this->indent;
    }

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

    /**
     * @param int|null $index
     *
     * @return string|null
     */
    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
     *
     * @param int $offset
     *
     * @return string|null
     */
    public function peek(int $offset = 1): ?string
    {
        return $this->getCharacter($this->currentPosition + $offset);
    }

    /**
     * Whether the remainder is blank
     *
     * @return bool
     */
    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
     *
     * @return void
     */
    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 || false === \strpos(
            $nextFewChars = $this->isMultibyte ?
                \mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
                \substr($this->line, $this->currentPosition, $characters),
            "\t"
        )) {
            $length = \min($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
     *
     * @return bool
     */
    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
     *
     * @param string $regex
     *
     * @return string|null
     */
    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.
     *
     * @return array<mixed>
     */
    public function saveState()
    {
        return [
            $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().
     *
     * @param array<mixed> $state
     *
     * @return void
     */
    public function restoreState($state): void
    {
        list(
            $this->currentPosition,
            $this->previousPosition,
            $this->nextNonSpaceCache,
            $this->indent,
            $this->column,
            $this->partiallyConsumedTab,
          ) = $state;
    }

    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, $length, 'UTF-8');
        } elseif ($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		/**
21		* @var string
22		*/
23		private $line;
24
25		/**
26		* @var int
27		*/
28		private $length;
29
30		/**
31		* @var int
32		*
33		* It's possible for this to be 1 char past the end, meaning we've parsed all chars and have
34		* reached the end. In this state, any character-returning method MUST return null.
35		*/
36		private $currentPosition = 0;
37
38		/**
39		* @var int
40		*/
41		private $column = 0;
42
43		/**
44		* @var int
45		*/
46		private $indent = 0;
47
48		/**
49		* @var int
50		*/
51		private $previousPosition = 0;
52
53		/**
54		* @var int\|null
55		*/
56		private $nextNonSpaceCache;
57
58		/**
59		* @var bool
60		*/
61		private $partiallyConsumedTab = false;
62
63		/**
64		* @var bool
65		*/
66		private $lineContainsTabs;
67
68		/**
69		* @var bool
70		*/
71		private $isMultibyte;
72
73		/**
74		* @var array<int, string>
75		*/
76		private $charCache = [];
77
78		/**
79		* @param string $line The line being parsed (ASCII or UTF-8)
80		*/
81	510	public function __construct(string $line)
82		{
83	510	$this->line = $line;
84	510	$this->length = \mb_strlen($line, 'UTF-8') ?: 0;
85	510	$this->isMultibyte = $this->length !== \strlen($line);
86	510	$this->lineContainsTabs = false !== \strpos($line, "\t");
87	510	}
88
89		/**
90		* Returns the position of the next character which is not a space (or tab)
91		*
92		* @return int
93		*/
94	204	public function getNextNonSpacePosition(): int
95		{
96	204	if ($this->nextNonSpaceCache !== null) {
97	24	return $this->nextNonSpaceCache;
98		}
99
100	204	$i = $this->currentPosition;
101	204	$cols = $this->column;
102
103	204	while (($c = $this->getCharacter($i)) !== null) {
104	180	if ($c === ' ') {
105	93	$i++;
106	93	$cols++;
107	138	} elseif ($c === "\t") {
108	6	$i++;
109	6	$cols += (4 - ($cols % 4));
110		} else {
111	138	break;
112		}
113		}
114
115	204	$nextNonSpace = ($c === null) ? $this->length : $i;
116	204	$this->indent = $cols - $this->column;
117
118	204	return $this->nextNonSpaceCache = $nextNonSpace;
119		}
120
121		/**
122		* Returns the next character which isn't a space (or tab)
123		*
124		* @return string
125		*/
126	24	public function getNextNonSpaceCharacter(): ?string
127		{
128	24	return $this->getCharacter($this->getNextNonSpacePosition());
129		}
130
131		/**
132		* Calculates the current indent (number of spaces after current position)
133		*
134		* @return int
135		*/
136	84	public function getIndent(): int
137		{
138	84	if ($this->nextNonSpaceCache === null) {
139	84	$this->getNextNonSpacePosition();
140		}
141
142	84	return $this->indent;
143		}
144
145		/**
146		* Whether the cursor is indented to INDENT_LEVEL
147		*
148		* @return bool
149		*/
150	24	public function isIndented(): bool
151		{
152	24	return $this->getIndent() >= self::INDENT_LEVEL;
153		}
154
155		/**
156		* @param int\|null $index
157		*
158		* @return string\|null
159		*/
160	264	public function getCharacter(?int $index = null): ?string
161		{
162	264	if ($index === null) {
163	30	$index = $this->currentPosition;
164		}
165
166		// Index out-of-bounds, or we're at the end
167	264	if ($index < 0 \|\| $index >= $this->length) {
168	90	return null;
169		}
170
171	222	if ($this->isMultibyte) {
172	57	if (isset($this->charCache[$index])) {
173	6	return $this->charCache[$index];
174		}
175
176	57	return $this->charCache[$index] = \mb_substr($this->line, $index, 1, 'UTF-8');
177		}
178
179	165	return $this->line[$index];
180		}
181
182		/**
183		* Returns the next character (or null, if none) without advancing forwards
184		*
185		* @param int $offset
186		*
187		* @return string\|null
188		*/
189	39	public function peek(int $offset = 1): ?string
190		{
191	39	return $this->getCharacter($this->currentPosition + $offset);
192		}
193
194		/**
195		* Whether the remainder is blank
196		*
197		* @return bool
198		*/
199	18	public function isBlank(): bool
200		{
201	18	return $this->nextNonSpaceCache === $this->length \|\| $this->getNextNonSpacePosition() === $this->length;
202		}
203
204		/**
205		* Move the cursor forwards
206		*/
207	39	public function advance(): void
208		{
209	39	$this->advanceBy(1);
210	39	}
211
212		/**
213		* Move the cursor forwards
214		*
215		* @param int $characters Number of characters to advance by
216		* @param bool $advanceByColumns Whether to advance by columns instead of spaces
217		*
218		* @return void
219		*/
220	372	public function advanceBy(int $characters, bool $advanceByColumns = false): void
221		{
222	372	if ($characters === 0) {
223	144	$this->previousPosition = $this->currentPosition;
224
225	144	return;
226		}
227
228	291	$this->previousPosition = $this->currentPosition;
229	291	$this->nextNonSpaceCache = null;
230
231		// Optimization to avoid tab handling logic if we have no tabs
232	291	if (!$this->lineContainsTabs \|\| false === \strpos(
233	9	$nextFewChars = $this->isMultibyte ?
234		\mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
235	9	\substr($this->line, $this->currentPosition, $characters),
236	291	"\t"
237		)) {
238	285	$length = \min($characters, $this->length - $this->currentPosition);
239	285	$this->partiallyConsumedTab = false;
240	285	$this->currentPosition += $length;
241	285	$this->column += $length;
242
243	285	return;
244		}
245
246	9	if ($characters === 1 && !empty($nextFewChars)) {
247	3	$asArray = [$nextFewChars];
248	6	} elseif ($this->isMultibyte) {
249		/** @var string[] $asArray */
250		$asArray = \preg_split('//u', $nextFewChars, -1, \PREG_SPLIT_NO_EMPTY);
251		} else {
252	6	$asArray = \str_split($nextFewChars);
253		}
254
255	9	foreach ($asArray as $relPos => $c) {
256	9	if ($c === "\t") {
257	9	$charsToTab = 4 - ($this->column % 4);
258	9	if ($advanceByColumns) {
259	3	$this->partiallyConsumedTab = $charsToTab > $characters;
260	3	$charsToAdvance = $charsToTab > $characters ? $characters : $charsToTab;
261	3	$this->column += $charsToAdvance;
262	3	$this->currentPosition += $this->partiallyConsumedTab ? 0 : 1;
263	3	$characters -= $charsToAdvance;
264		} else {
265	6	$this->partiallyConsumedTab = false;
266	6	$this->column += $charsToTab;
267	6	$this->currentPosition++;
268	9	$characters--;
269		}
270		} else {
271	3	$this->partiallyConsumedTab = false;
272	3	$this->currentPosition++;
273	3	$this->column++;
274	3	$characters--;
275		}
276
277	9	if ($characters <= 0) {
278	9	break;
279		}
280		}
281	9	}
282
283		/**
284		* Advances the cursor by a single space or tab, if present
285		*
286		* @return bool
287		*/
288	18	public function advanceBySpaceOrTab(): bool
289		{
290	18	$character = $this->getCharacter();
291
292	18	if ($character === ' ' \|\| $character === "\t") {
293	18	$this->advanceBy(1, true);
294
295	18	return true;
296		}
297
298	18	return false;
299		}
300
301		/**
302		* Parse zero or more space/tab characters
303		*
304		* @return int Number of positions moved
305		*/
306	78	public function advanceToNextNonSpaceOrTab(): int
307		{
308	78	$newPosition = $this->getNextNonSpacePosition();
309	78	$this->advanceBy($newPosition - $this->currentPosition);
310	78	$this->partiallyConsumedTab = false;
311
312	78	return $this->currentPosition - $this->previousPosition;
313		}
314
315		/**
316		* Parse zero or more space characters, including at most one newline.
317		*
318		* Tab characters are not parsed with this function.
319		*
320		* @return int Number of positions moved
321		*/
322	54	public function advanceToNextNonSpaceOrNewline(): int
323		{
324	54	$remainder = $this->getRemainder();
325
326		// Optimization: Avoid the regex if we know there are no spaces or newlines
327	54	if (empty($remainder) \|\| ($remainder[0] !== ' ' && $remainder[0] !== "\n")) {
328	24	$this->previousPosition = $this->currentPosition;
329
330	24	return 0;
331		}
332
333	30	$matches = [];
334	30	\preg_match('/^ (?:\n )?/', $remainder, $matches, \PREG_OFFSET_CAPTURE);
335
336		// [0][0] contains the matched text
337		// [0][1] contains the index of that match
338	30	$increment = $matches[0][1] + \strlen($matches[0][0]);
339
340	30	$this->advanceBy($increment);
341
342	30	return $this->currentPosition - $this->previousPosition;
343		}
344
345		/**
346		* Move the position to the very end of the line
347		*
348		* @return int The number of characters moved
349		*/
350		public function advanceToEnd(): int
351		{
352		$this->previousPosition = $this->currentPosition;
353		$this->nextNonSpaceCache = null;
354
355		$this->currentPosition = $this->length;
356
357		return $this->currentPosition - $this->previousPosition;
358		}
359
360	144	public function getRemainder(): string
361		{
362	144	if ($this->currentPosition >= $this->length) {
363	9	return '';
364		}
365
366	135	$prefix = '';
367	135	$position = $this->currentPosition;
368	135	if ($this->partiallyConsumedTab) {
369		$position++;
370		$charsToTab = 4 - ($this->column % 4);
371		$prefix = \str_repeat(' ', $charsToTab);
372		}
373
374	135	$subString = $this->isMultibyte ?
375	27	\mb_substr($this->line, $position, null, 'UTF-8') :
376	135	\substr($this->line, $position);
377
378	135	return $prefix . $subString;
379		}
380
381	3	public function getLine(): string
382		{
383	3	return $this->line;
384		}
385
386	21	public function isAtEnd(): bool
387		{
388	21	return $this->currentPosition >= $this->length;
389		}
390
391		/**
392		* Try to match a regular expression
393		*
394		* Returns the matching text and advances to the end of that match
395		*
396		* @param string $regex
397		*
398		* @return string\|null
399		*/
400	48	public function match(string $regex): ?string
401		{
402	48	$subject = $this->getRemainder();
403
404	48	if (!\preg_match($regex, $subject, $matches, \PREG_OFFSET_CAPTURE)) {
405	9	return null;
406		}
407
408		// $matches[0][0] contains the matched text
409		// $matches[0][1] contains the index of that match
410
411	39	if ($this->isMultibyte) {
412		// PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
413	15	$offset = \mb_strlen(\substr($subject, 0, $matches[0][1]), 'UTF-8');
414	15	$matchLength = \mb_strlen($matches[0][0], 'UTF-8');
415		} else {
416	24	$offset = $matches[0][1];
417	24	$matchLength = \strlen($matches[0][0]);
418		}
419
420		// [0][0] contains the matched text
421		// [0][1] contains the index of that match
422	39	$this->advanceBy($offset + $matchLength);
423
424	39	return $matches[0][0];
425		}
426
427		/**
428		* Encapsulates the current state of this cursor in case you need to rollback later.
429		*
430		* WARNING: Do not parse or use the return value for ANYTHING except for
431		* passing it back into restoreState(), as the number of values and their
432		* contents may change in any future release without warning.
433		*
434		* @return array<mixed>
435		*/
436	33	public function saveState()
437		{
438		return [
439	33	$this->currentPosition,
440	33	$this->previousPosition,
441	33	$this->nextNonSpaceCache,
442	33	$this->indent,
443	33	$this->column,
444	33	$this->partiallyConsumedTab,
445		];
446		}
447
448		/**
449		* Restore the cursor to a previous state.
450		*
451		* Pass in the value previously obtained by calling saveState().
452		*
453		* @param array<mixed> $state
454		*
455		* @return void
456		*/
457	6	public function restoreState($state): void
458		{
459		list(
460	6	$this->currentPosition,
461	6	$this->previousPosition,
462	6	$this->nextNonSpaceCache,
463	6	$this->indent,
464	6	$this->column,
465	6	$this->partiallyConsumedTab,
466	4	) = $state;
467	6	}
468
469	129	public function getPosition(): int
470		{
471	129	return $this->currentPosition;
472		}
473
474	6	public function getPreviousText(): string
475		{
476	6	return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, 'UTF-8');
477		}
478
479	21	public function getSubstring(int $start, ?int $length = null): string
480		{
481	21	if ($this->isMultibyte) {
482	9	return \mb_substr($this->line, $start, $length, 'UTF-8');
483	12	} elseif ($length !== null) {
484	9	return \substr($this->line, $start, $length);
485		}
486
487	3	return \substr($this->line, $start);
488		}
489
490	21	public function getColumn(): int
491		{
492	21	return $this->column;
493		}
494		}
495

thephpleague / commonmark

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Cursor::advance() A

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