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517 lines
13 KiB
PHP
517 lines
13 KiB
PHP
<?php
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namespace Sabberworm\CSS\Parsing;
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use Sabberworm\CSS\Comment\Comment;
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use Sabberworm\CSS\Settings;
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class ParserState
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{
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/**
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* @var null
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*/
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const EOF = null;
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/**
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* @var Settings
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*/
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private $oParserSettings;
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/**
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* @var string
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*/
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private $sText;
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/**
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* @var array<int, string>
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*/
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private $aText;
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/**
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* @var int
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*/
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private $iCurrentPosition;
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/**
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* @var string
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*/
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private $sCharset;
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/**
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* @var int
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*/
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private $iLength;
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/**
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* @var int
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*/
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private $iLineNo;
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/**
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* @param string $sText
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* @param int $iLineNo
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*/
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public function __construct($sText, Settings $oParserSettings, $iLineNo = 1)
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{
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$this->oParserSettings = $oParserSettings;
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$this->sText = $sText;
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$this->iCurrentPosition = 0;
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$this->iLineNo = $iLineNo;
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$this->setCharset($this->oParserSettings->sDefaultCharset);
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}
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/**
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* @param string $sCharset
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*
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* @return void
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*/
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public function setCharset($sCharset)
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{
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$this->sCharset = $sCharset;
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$this->aText = $this->strsplit($this->sText);
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if (is_array($this->aText)) {
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$this->iLength = count($this->aText);
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}
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}
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/**
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* @return string
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*/
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public function getCharset()
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{
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return $this->sCharset;
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}
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/**
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* @return int
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*/
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public function currentLine()
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{
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return $this->iLineNo;
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}
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/**
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* @return int
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*/
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public function currentColumn()
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{
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return $this->iCurrentPosition;
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}
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/**
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* @return Settings
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*/
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public function getSettings()
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{
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return $this->oParserSettings;
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}
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/**
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* @param bool $bIgnoreCase
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*
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* @return string
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*
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* @throws UnexpectedTokenException
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*/
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public function parseIdentifier($bIgnoreCase = true)
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{
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$sResult = $this->parseCharacter(true);
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if ($sResult === null) {
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throw new UnexpectedTokenException($sResult, $this->peek(5), 'identifier', $this->iLineNo);
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}
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$sCharacter = null;
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while (($sCharacter = $this->parseCharacter(true)) !== null) {
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if (preg_match('/[a-zA-Z0-9\x{00A0}-\x{FFFF}_-]/Sux', $sCharacter)) {
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$sResult .= $sCharacter;
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} else {
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$sResult .= '\\' . $sCharacter;
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}
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}
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if ($bIgnoreCase) {
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$sResult = $this->strtolower($sResult);
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}
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return $sResult;
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}
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/**
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* @param bool $bIsForIdentifier
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*
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* @return string|null
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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public function parseCharacter($bIsForIdentifier)
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{
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if ($this->peek() === '\\') {
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if (
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$bIsForIdentifier && $this->oParserSettings->bLenientParsing
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&& ($this->comes('\0') || $this->comes('\9'))
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) {
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// Non-strings can contain \0 or \9 which is an IE hack supported in lenient parsing.
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return null;
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}
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$this->consume('\\');
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if ($this->comes('\n') || $this->comes('\r')) {
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return '';
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}
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if (preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {
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return $this->consume(1);
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}
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$sUnicode = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u', 6);
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if ($this->strlen($sUnicode) < 6) {
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// Consume whitespace after incomplete unicode escape
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if (preg_match('/\\s/isSu', $this->peek())) {
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if ($this->comes('\r\n')) {
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$this->consume(2);
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} else {
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$this->consume(1);
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}
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}
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}
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$iUnicode = intval($sUnicode, 16);
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$sUtf32 = "";
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for ($i = 0; $i < 4; ++$i) {
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$sUtf32 .= chr($iUnicode & 0xff);
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$iUnicode = $iUnicode >> 8;
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}
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return iconv('utf-32le', $this->sCharset, $sUtf32);
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}
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if ($bIsForIdentifier) {
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$peek = ord($this->peek());
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// Ranges: a-z A-Z 0-9 - _
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if (
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($peek >= 97 && $peek <= 122)
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|| ($peek >= 65 && $peek <= 90)
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|| ($peek >= 48 && $peek <= 57)
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|| ($peek === 45)
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|| ($peek === 95)
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|| ($peek > 0xa1)
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) {
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return $this->consume(1);
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}
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} else {
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return $this->consume(1);
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}
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return null;
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}
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/**
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* @return array<int, Comment>|void
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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public function consumeWhiteSpace()
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{
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$comments = [];
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do {
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while (preg_match('/\\s/isSu', $this->peek()) === 1) {
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$this->consume(1);
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}
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if ($this->oParserSettings->bLenientParsing) {
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try {
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$oComment = $this->consumeComment();
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} catch (UnexpectedEOFException $e) {
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$this->iCurrentPosition = $this->iLength;
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return;
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}
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} else {
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$oComment = $this->consumeComment();
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}
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if ($oComment !== false) {
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$comments[] = $oComment;
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}
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} while ($oComment !== false);
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return $comments;
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}
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/**
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* @param string $sString
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* @param bool $bCaseInsensitive
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*
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* @return bool
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*/
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public function comes($sString, $bCaseInsensitive = false)
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{
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$sPeek = $this->peek(strlen($sString));
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return ($sPeek == '')
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? false
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: $this->streql($sPeek, $sString, $bCaseInsensitive);
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}
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/**
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* @param int $iLength
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* @param int $iOffset
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*
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* @return string
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*/
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public function peek($iLength = 1, $iOffset = 0)
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{
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$iOffset += $this->iCurrentPosition;
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if ($iOffset >= $this->iLength) {
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return '';
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}
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return $this->substr($iOffset, $iLength);
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}
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/**
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* @param int $mValue
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*
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* @return string
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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public function consume($mValue = 1)
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{
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if (is_string($mValue)) {
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$iLineCount = substr_count($mValue, "\n");
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$iLength = $this->strlen($mValue);
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if (!$this->streql($this->substr($this->iCurrentPosition, $iLength), $mValue)) {
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throw new UnexpectedTokenException($mValue, $this->peek(max($iLength, 5)), $this->iLineNo);
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}
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$this->iLineNo += $iLineCount;
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$this->iCurrentPosition += $this->strlen($mValue);
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return $mValue;
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} else {
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if ($this->iCurrentPosition + $mValue > $this->iLength) {
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throw new UnexpectedEOFException($mValue, $this->peek(5), 'count', $this->iLineNo);
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}
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$sResult = $this->substr($this->iCurrentPosition, $mValue);
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$iLineCount = substr_count($sResult, "\n");
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$this->iLineNo += $iLineCount;
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$this->iCurrentPosition += $mValue;
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return $sResult;
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}
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}
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/**
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* @param string $mExpression
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* @param int|null $iMaxLength
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*
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* @return string
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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public function consumeExpression($mExpression, $iMaxLength = null)
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{
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$aMatches = null;
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$sInput = $iMaxLength !== null ? $this->peek($iMaxLength) : $this->inputLeft();
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if (preg_match($mExpression, $sInput, $aMatches, PREG_OFFSET_CAPTURE) === 1) {
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return $this->consume($aMatches[0][0]);
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}
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throw new UnexpectedTokenException($mExpression, $this->peek(5), 'expression', $this->iLineNo);
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}
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/**
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* @return Comment|false
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*/
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public function consumeComment()
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{
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$mComment = false;
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if ($this->comes('/*')) {
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$iLineNo = $this->iLineNo;
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$this->consume(1);
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$mComment = '';
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while (($char = $this->consume(1)) !== '') {
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$mComment .= $char;
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if ($this->comes('*/')) {
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$this->consume(2);
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break;
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}
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}
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}
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if ($mComment !== false) {
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// We skip the * which was included in the comment.
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return new Comment(substr($mComment, 1), $iLineNo);
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}
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return $mComment;
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}
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/**
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* @return bool
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*/
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public function isEnd()
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{
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return $this->iCurrentPosition >= $this->iLength;
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}
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/**
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* @param array<array-key, string>|string $aEnd
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* @param string $bIncludeEnd
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* @param string $consumeEnd
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* @param array<int, Comment> $comments
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*
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* @return string
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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public function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = [])
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{
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$aEnd = is_array($aEnd) ? $aEnd : [$aEnd];
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$out = '';
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$start = $this->iCurrentPosition;
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while (!$this->isEnd()) {
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$char = $this->consume(1);
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if (in_array($char, $aEnd)) {
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if ($bIncludeEnd) {
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$out .= $char;
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} elseif (!$consumeEnd) {
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$this->iCurrentPosition -= $this->strlen($char);
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}
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return $out;
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}
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$out .= $char;
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if ($comment = $this->consumeComment()) {
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$comments[] = $comment;
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}
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}
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if (in_array(self::EOF, $aEnd)) {
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return $out;
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}
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$this->iCurrentPosition = $start;
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throw new UnexpectedEOFException(
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'One of ("' . implode('","', $aEnd) . '")',
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$this->peek(5),
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'search',
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$this->iLineNo
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);
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}
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/**
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* @return string
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*/
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private function inputLeft()
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{
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return $this->substr($this->iCurrentPosition, -1);
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}
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/**
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* @param string $sString1
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* @param string $sString2
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* @param bool $bCaseInsensitive
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*
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* @return bool
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*/
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public function streql($sString1, $sString2, $bCaseInsensitive = true)
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{
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if ($bCaseInsensitive) {
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return $this->strtolower($sString1) === $this->strtolower($sString2);
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} else {
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return $sString1 === $sString2;
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}
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}
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/**
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* @param int $iAmount
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*
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* @return void
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*/
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public function backtrack($iAmount)
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{
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$this->iCurrentPosition -= $iAmount;
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}
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/**
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* @param string $sString
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*
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* @return int
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*/
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public function strlen($sString)
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{
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if ($this->oParserSettings->bMultibyteSupport) {
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return mb_strlen($sString, $this->sCharset);
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} else {
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return strlen($sString);
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}
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}
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/**
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* @param int $iStart
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* @param int $iLength
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*
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* @return string
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*/
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private function substr($iStart, $iLength)
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{
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if ($iLength < 0) {
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$iLength = $this->iLength - $iStart + $iLength;
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}
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if ($iStart + $iLength > $this->iLength) {
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$iLength = $this->iLength - $iStart;
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}
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$sResult = '';
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while ($iLength > 0) {
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$sResult .= $this->aText[$iStart];
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$iStart++;
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$iLength--;
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}
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return $sResult;
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}
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/**
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* @param string $sString
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*
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* @return string
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*/
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private function strtolower($sString)
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{
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if ($this->oParserSettings->bMultibyteSupport) {
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return mb_strtolower($sString, $this->sCharset);
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} else {
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return strtolower($sString);
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}
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}
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/**
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* @param string $sString
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*
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* @return array<int, string>
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*/
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private function strsplit($sString)
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{
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if ($this->oParserSettings->bMultibyteSupport) {
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if ($this->streql($this->sCharset, 'utf-8')) {
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return preg_split('//u', $sString, -1, PREG_SPLIT_NO_EMPTY);
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} else {
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$iLength = mb_strlen($sString, $this->sCharset);
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$aResult = [];
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for ($i = 0; $i < $iLength; ++$i) {
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$aResult[] = mb_substr($sString, $i, 1, $this->sCharset);
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}
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return $aResult;
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}
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} else {
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if ($sString === '') {
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return [];
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} else {
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return str_split($sString);
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}
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}
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}
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/**
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* @param string $sString
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* @param string $sNeedle
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* @param int $iOffset
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*
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* @return int|false
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*/
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private function strpos($sString, $sNeedle, $iOffset)
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{
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if ($this->oParserSettings->bMultibyteSupport) {
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return mb_strpos($sString, $sNeedle, $iOffset, $this->sCharset);
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} else {
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return strpos($sString, $sNeedle, $iOffset);
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}
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}
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}
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