Proyectos de Subversion Moodle

<?php

namespace Sabberworm\CSS\Parsing;

use Sabberworm\CSS\Comment\Comment;

use Sabberworm\CSS\Settings;

/**

 * @internal since 8.7.0

 */

class ParserState

{

    /**

     * @var null

     *

     * @internal since 8.5.2

     */

    const EOF = null;

    /**

     * @var Settings

     */

    private $oParserSettings;

    /**

     * @var string

     */

    private $sText;

    /**

     * @var array<int, string>

     */

    private $aText;

    /**

     * @var int

     */

    private $iCurrentPosition;

    /**

     * will only be used if the CSS does not contain an `@charset` declaration

     *

     * @var string

     */

    private $sCharset;

    /**

     * @var int

     */

    private $iLength;

    /**

     * @var int

     */

    private $iLineNo;

    /**

     * @param string $sText the complete CSS as text (i.e., usually the contents of a CSS file)

     * @param int $iLineNo

     */

    public function __construct($sText, Settings $oParserSettings, $iLineNo = 1)

    {

        $this->oParserSettings = $oParserSettings;

        $this->sText = $sText;

        $this->iCurrentPosition = 0;

        $this->iLineNo = $iLineNo;

        $this->setCharset($this->oParserSettings->sDefaultCharset);

    }

    /**

     * Sets the charset to be used if the CSS does not contain an `@charset` declaration.

     *

     * @param string $sCharset

     *

     * @return void

     */

    public function setCharset($sCharset)

    {

        $this->sCharset = $sCharset;

        $this->aText = $this->strsplit($this->sText);

        if (is_array($this->aText)) {

            $this->iLength = count($this->aText);

        }

    }

    /**

     * Returns the charset that is used if the CSS does not contain an `@charset` declaration.

     *

     * @return string

     */

    public function getCharset()

    {

        return $this->sCharset;

    }

    /**

     * @return int

     */

    public function currentLine()

    {

        return $this->iLineNo;

    }

    /**

     * @return int

     */

    public function currentColumn()

    {

        return $this->iCurrentPosition;

    }

    /**

     * @return Settings

     */

    public function getSettings()

    {

        return $this->oParserSettings;

    }

    /**

     * @return \Sabberworm\CSS\Parsing\Anchor

     */

    public function anchor()

    {

        return new Anchor($this->iCurrentPosition, $this);

    }

    /**

     * @param int $iPosition

     *

     * @return void

     */

    public function setPosition($iPosition)

    {

        $this->iCurrentPosition = $iPosition;

    }

    /**

     * @param bool $bIgnoreCase

     *

     * @return string

     *

     * @throws UnexpectedTokenException

     */

    public function parseIdentifier($bIgnoreCase = true)

    {

        if ($this->isEnd()) {

            throw new UnexpectedEOFException('', '', 'identifier', $this->iLineNo);

        }

        $sResult = $this->parseCharacter(true);

        if ($sResult === null) {

            throw new UnexpectedTokenException($sResult, $this->peek(5), 'identifier', $this->iLineNo);

        }

        $sCharacter = null;

        while (!$this->isEnd() && ($sCharacter = $this->parseCharacter(true)) !== null) {

            if (preg_match('/[a-zA-Z0-9\x{00A0}-\x{FFFF}_-]/Sux', $sCharacter)) {

                $sResult .= $sCharacter;

            } else {

                $sResult .= '\\' . $sCharacter;

            }

        }

        if ($bIgnoreCase) {

            $sResult = $this->strtolower($sResult);

        }

        return $sResult;

    }

    /**

     * @param bool $bIsForIdentifier

     *

     * @return string|null

     *

     * @throws UnexpectedEOFException

     * @throws UnexpectedTokenException

     */

    public function parseCharacter($bIsForIdentifier)

    {

        if ($this->peek() === '\\') {

            if (

                $bIsForIdentifier && $this->oParserSettings->bLenientParsing

                && ($this->comes('\0') || $this->comes('\9'))

            ) {

                // Non-strings can contain \0 or \9 which is an IE hack supported in lenient parsing.

                return null;

            }

            $this->consume('\\');

            if ($this->comes('\n') || $this->comes('\r')) {

                return '';

            }

            if (preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {

                return $this->consume(1);

            }

            $sUnicode = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u', 6);

            if ($this->strlen($sUnicode) < 6) {

                // Consume whitespace after incomplete unicode escape

                if (preg_match('/\\s/isSu', $this->peek())) {

                    if ($this->comes('\r\n')) {

                        $this->consume(2);

                    } else {

                        $this->consume(1);

                    }

                }

            }

            $iUnicode = intval($sUnicode, 16);

            $sUtf32 = "";

            for ($i = 0; $i < 4; ++$i) {

                $sUtf32 .= chr($iUnicode & 0xff);

                $iUnicode = $iUnicode >> 8;

            }

            return iconv('utf-32le', $this->sCharset, $sUtf32);

        }

        if ($bIsForIdentifier) {

            $peek = ord($this->peek());

            // Ranges: a-z A-Z 0-9 - _

            if (

                ($peek >= 97 && $peek <= 122)

                || ($peek >= 65 && $peek <= 90)

                || ($peek >= 48 && $peek <= 57)

                || ($peek === 45)

                || ($peek === 95)

                || ($peek > 0xa1)

            ) {

                return $this->consume(1);

            }

        } else {

            return $this->consume(1);

        }

        return null;

    }

    /**

     * @return array<int, Comment>|void

     *

     * @throws UnexpectedEOFException

     * @throws UnexpectedTokenException

     */

    public function consumeWhiteSpace()

    {

        $aComments = [];

        do {

            while (preg_match('/\\s/isSu', $this->peek()) === 1) {

                $this->consume(1);

            }

            if ($this->oParserSettings->bLenientParsing) {

                try {

                    $oComment = $this->consumeComment();

                } catch (UnexpectedEOFException $e) {

                    $this->iCurrentPosition = $this->iLength;

                    return $aComments;

                }

            } else {

                $oComment = $this->consumeComment();

            }

            if ($oComment !== false) {

                $aComments[] = $oComment;

            }

        } while ($oComment !== false);

        return $aComments;

    }

    /**

     * @param string $sString

     * @param bool $bCaseInsensitive

     *

     * @return bool

     */

    public function comes($sString, $bCaseInsensitive = false)

    {

        $sPeek = $this->peek(strlen($sString));

        return ($sPeek == '')

            ? false

            : $this->streql($sPeek, $sString, $bCaseInsensitive);

    }

    /**

     * @param int $iLength

     * @param int $iOffset

     *

     * @return string

     */

    public function peek($iLength = 1, $iOffset = 0)

    {

        $iOffset += $this->iCurrentPosition;

        if ($iOffset >= $this->iLength) {

            return '';

        }

        return $this->substr($iOffset, $iLength);

    }

    /**

     * @param int $mValue

     *

     * @return string

     *

     * @throws UnexpectedEOFException

     * @throws UnexpectedTokenException

     */

    public function consume($mValue = 1)

    {

        if (is_string($mValue)) {

            $iLineCount = substr_count($mValue, "\n");

            $iLength = $this->strlen($mValue);

            if (!$this->streql($this->substr($this->iCurrentPosition, $iLength), $mValue)) {

                throw new UnexpectedTokenException($mValue, $this->peek(max($iLength, 5)), $this->iLineNo);

            }

            $this->iLineNo += $iLineCount;

            $this->iCurrentPosition += $this->strlen($mValue);

            return $mValue;

        } else {

            if ($this->iCurrentPosition + $mValue > $this->iLength) {

                throw new UnexpectedEOFException($mValue, $this->peek(5), 'count', $this->iLineNo);

            }

            $sResult = $this->substr($this->iCurrentPosition, $mValue);

            $iLineCount = substr_count($sResult, "\n");

            $this->iLineNo += $iLineCount;

            $this->iCurrentPosition += $mValue;

            return $sResult;

        }

    }

    /**

     * @param string $mExpression

     * @param int|null $iMaxLength

     *

     * @return string

     *

     * @throws UnexpectedEOFException

     * @throws UnexpectedTokenException

     */

    public function consumeExpression($mExpression, $iMaxLength = null)

    {

        $aMatches = null;

        $sInput = $iMaxLength !== null ? $this->peek($iMaxLength) : $this->inputLeft();

        if (preg_match($mExpression, $sInput, $aMatches, PREG_OFFSET_CAPTURE) === 1) {

            return $this->consume($aMatches[0][0]);

        }

        throw new UnexpectedTokenException($mExpression, $this->peek(5), 'expression', $this->iLineNo);

    }

    /**

     * @return Comment|false

     */

    public function consumeComment()

    {

        $mComment = false;

        if ($this->comes('/*')) {

            $iLineNo = $this->iLineNo;

            $this->consume(1);

            $mComment = '';

            while (($char = $this->consume(1)) !== '') {

                $mComment .= $char;

                if ($this->comes('*/')) {

                    $this->consume(2);

                    break;

                }

            }

        }

        if ($mComment !== false) {

            // We skip the * which was included in the comment.

            return new Comment(substr($mComment, 1), $iLineNo);

        }

        return $mComment;

    }

    /**

     * @return bool

     */

    public function isEnd()

    {

        return $this->iCurrentPosition >= $this->iLength;

    }

    /**

     * @param array<array-key, string>|string $aEnd

     * @param string $bIncludeEnd

     * @param string $consumeEnd

     * @param array<int, Comment> $comments

     *

     * @return string

     *

     * @throws UnexpectedEOFException

     * @throws UnexpectedTokenException

     */

    public function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = [])

    {

        $aEnd = is_array($aEnd) ? $aEnd : [$aEnd];

        $out = '';

        $start = $this->iCurrentPosition;

        while (!$this->isEnd()) {

            $char = $this->consume(1);

            if (in_array($char, $aEnd)) {

                if ($bIncludeEnd) {

                    $out .= $char;

                } elseif (!$consumeEnd) {

                    $this->iCurrentPosition -= $this->strlen($char);

                }

                return $out;

            }

            $out .= $char;

            if ($comment = $this->consumeComment()) {

                $comments[] = $comment;

            }

        }

        if (in_array(self::EOF, $aEnd)) {

            return $out;

        }

        $this->iCurrentPosition = $start;

        throw new UnexpectedEOFException(

            'One of ("' . implode('","', $aEnd) . '")',

            $this->peek(5),

            'search',

            $this->iLineNo

        );

    }

    /**

     * @return string

     */

    private function inputLeft()

    {

        return $this->substr($this->iCurrentPosition, -1);

    }

    /**

     * @param string $sString1

     * @param string $sString2

     * @param bool $bCaseInsensitive

     *

     * @return bool

     */

    public function streql($sString1, $sString2, $bCaseInsensitive = true)

    {

        if ($bCaseInsensitive) {

            return $this->strtolower($sString1) === $this->strtolower($sString2);

        } else {

            return $sString1 === $sString2;

        }

    }

    /**

     * @param int $iAmount

     *

     * @return void

     */

    public function backtrack($iAmount)

    {

        $this->iCurrentPosition -= $iAmount;

    }

    /**

     * @param string $sString

     *

     * @return int

     */

    public function strlen($sString)

    {

        if ($this->oParserSettings->bMultibyteSupport) {

            return mb_strlen($sString, $this->sCharset);

        } else {

            return strlen($sString);

        }

    }

    /**

     * @param int $iStart

     * @param int $iLength

     *

     * @return string

     */

    private function substr($iStart, $iLength)

    {

        if ($iLength < 0) {

            $iLength = $this->iLength - $iStart + $iLength;

        }

        if ($iStart + $iLength > $this->iLength) {

            $iLength = $this->iLength - $iStart;

        }

        $sResult = '';

        while ($iLength > 0) {

            $sResult .= $this->aText[$iStart];

            $iStart++;

            $iLength--;

        }

        return $sResult;

    }

    /**

     * @param string $sString

     *

     * @return string

     */

    private function strtolower($sString)

    {

        if ($this->oParserSettings->bMultibyteSupport) {

            return mb_strtolower($sString, $this->sCharset);

        } else {

            return strtolower($sString);

        }

    }

    /**

     * @param string $sString

     *

     * @return array<int, string>

     */

    private function strsplit($sString)

    {

        if ($this->oParserSettings->bMultibyteSupport) {

            if ($this->streql($this->sCharset, 'utf-8')) {

                return preg_split('//u', $sString, -1, PREG_SPLIT_NO_EMPTY);

            } else {

                $iLength = mb_strlen($sString, $this->sCharset);

                $aResult = [];

                for ($i = 0; $i < $iLength; ++$i) {

                    $aResult[] = mb_substr($sString, $i, 1, $this->sCharset);

                }

                return $aResult;

            }

        } else {

            if ($sString === '') {

                return [];

            } else {

                return str_split($sString);

            }

        }

    }

    /**

     * @param string $sString

     * @param string $sNeedle

     * @param int $iOffset

     *

     * @return int|false

     */

    private function strpos($sString, $sNeedle, $iOffset)

    {

        if ($this->oParserSettings->bMultibyteSupport) {

            return mb_strpos($sString, $sNeedle, $iOffset, $this->sCharset);

        } else {

            return strpos($sString, $sNeedle, $iOffset);

        }

    }

}