CasperSecurity
<?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 $bIgnoreCase
*
* @return string
*
* @throws UnexpectedTokenException
*
* @internal since V8.8.0
*/
public function parseIdentifier($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 $bIsForIdentifier
*
* @return string|null
*
* @throws UnexpectedEOFException
* @throws UnexpectedTokenException
*
* @internal since V8.8.0
*/
public function parseCharacter($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);
}
}
}