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File Content: `Cursor.php`

<?php

declare(strict_types=1);

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

namespace League\CommonMark\Parser;

use League\CommonMark\Exception\UnexpectedEncodingException;

class Cursor
{
    public const INDENT_LEVEL = 4;

    /** @psalm-readonly */
    private string $line;

    /** @psalm-readonly */
    private int $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 int $currentPosition = 0;

    private int $column = 0;

    private int $indent = 0;

    private int $previousPosition = 0;

    private ?int $nextNonSpaceCache = null;

    private bool $partiallyConsumedTab = false;

    /**
     * @var int|false
     *
     * @psalm-readonly
     */
    private $lastTabPosition;

    /** @psalm-readonly */
    private bool $isMultibyte;

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

    /**
     * @param string $line The line being parsed (ASCII or UTF-8)
     */
    public function __construct(string $line)
    {
        if (! \mb_check_encoding($line, 'UTF-8')) {
            throw new UnexpectedEncodingException('Unexpected encoding - UTF-8 or ASCII was expected');
        }

        $this->line            = $line;
        $this->length          = \mb_strlen($line, 'UTF-8') ?: 0;
        $this->isMultibyte     = $this->length !== \strlen($line);
        $this->lastTabPosition = $this->isMultibyte ? \mb_strrpos($line, "\t", 0, 'UTF-8') : \strrpos($line, "\t");
    }

    /**
     * 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;
        }

        if ($this->currentPosition >= $this->length) {
            return $this->length;
        }

        $cols = $this->column;

        for ($i = $this->currentPosition; $i < $this->length; $i++) {
            // This if-else was copied out of getCharacter() for performance reasons
            if ($this->isMultibyte) {
                $c = $this->charCache[$i] ??= \mb_substr($this->line, $i, 1, 'UTF-8');
            } else {
                $c = $this->line[$i];
            }

            if ($c === ' ') {
                $cols++;
            } elseif ($c === "\t") {
                $cols += 4 - ($cols % 4);
            } else {
                break;
            }
        }

        $this->indent = $cols - $this->column;

        return $this->nextNonSpaceCache = $i;
    }

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

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

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

    /**
     * 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
    {
        if ($this->nextNonSpaceCache === null) {
            $this->getNextNonSpacePosition();
        }

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

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

    /**
     * Slightly-optimized version of getCurrent(null)
     */
    public function getCurrentCharacter(): ?string
    {
        if ($this->currentPosition >= $this->length) {
            return null;
        }

        if ($this->isMultibyte) {
            return $this->charCache[$this->currentPosition] ??= \mb_substr($this->line, $this->currentPosition, 1, 'UTF-8');
        }

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

    /**
     * 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
    {
        $this->previousPosition  = $this->currentPosition;
        $this->nextNonSpaceCache = null;

        if ($this->currentPosition >= $this->length || $characters === 0) {
            return;
        }

        // Optimization to avoid tab handling logic if we have no tabs
        if ($this->lastTabPosition === false || $this->currentPosition > $this->lastTabPosition) {
            $length                     = \min($characters, $this->length - $this->currentPosition);
            $this->partiallyConsumedTab = false;
            $this->currentPosition     += $length;
            $this->column              += $length;

            return;
        }

        $nextFewChars = $this->isMultibyte ?
            \mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
            \substr($this->line, $this->currentPosition, $characters);

        if ($characters === 1) {
            $asArray = [$nextFewChars];
        } elseif ($this->isMultibyte) {
            /** @var string[] $asArray */
            $asArray = \mb_str_split($nextFewChars, 1, 'UTF-8');
        } else {
            $asArray = \str_split($nextFewChars);
        }

        foreach ($asArray as $c) {
            if ($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->getCurrentCharacter();

        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->nextNonSpaceCache ?? $this->getNextNonSpacePosition();
        if ($newPosition === $this->currentPosition) {
            return 0;
        }

        $this->advanceBy($newPosition - $this->currentPosition);
        $this->partiallyConsumedTab = false;

        // We've just advanced to where that non-space is,
        // so any subsequent calls to find the next one will
        // always return the current position.
        $this->nextNonSpaceCache = $this->currentPosition;
        $this->indent            = 0;

        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 ($remainder === '' || ($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
     *
     * @psalm-param non-empty-string $regex
     */
    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
    {
        if ($this->isMultibyte) {
            return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, 'UTF-8');
        }

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

    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;
    }
}
Name	Size	Permission
Block	---	0755
Inline	---	0755
Cursor.php	14267 bytes	0644
CursorState.php	1128 bytes	0644
InlineParserContext.php	2870 bytes	0644
InlineParserEngine.php	6661 bytes	0644
InlineParserEngineInterface.php	643 bytes	0644
MarkdownParser.php	12157 bytes	0644
MarkdownParserInterface.php	547 bytes	0644
MarkdownParserState.php	1632 bytes	0644
MarkdownParserStateInterface.php	1076 bytes	0644
ParserLogicException.php	449 bytes	0644
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File Content: `Cursor.php`
