%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
namespace Sabberworm\CSS;
use Sabberworm\CSS\CSSList\CSSList;
use Sabberworm\CSS\CSSList\Document;
use Sabberworm\CSS\CSSList\KeyFrame;
use Sabberworm\CSS\Parsing\SourceException;
use Sabberworm\CSS\Property\AtRule;
use Sabberworm\CSS\Property\Import;
use Sabberworm\CSS\Property\Charset;
use Sabberworm\CSS\Property\CSSNamespace;
use Sabberworm\CSS\RuleSet\AtRuleSet;
use Sabberworm\CSS\CSSList\AtRuleBlockList;
use Sabberworm\CSS\RuleSet\DeclarationBlock;
use Sabberworm\CSS\Value\CSSFunction;
use Sabberworm\CSS\Value\RuleValueList;
use Sabberworm\CSS\Value\Size;
use Sabberworm\CSS\Value\Color;
use Sabberworm\CSS\Value\URL;
use Sabberworm\CSS\Value\CSSString;
use Sabberworm\CSS\Rule\Rule;
use Sabberworm\CSS\Parsing\UnexpectedTokenException;
use Sabberworm\CSS\Comment\Comment;
/**
* Parser class parses CSS from text into a data structure.
*/
class Parser {
private $sText;
private $aText;
private $iCurrentPosition;
private $oParserSettings;
private $sCharset;
private $iLength;
private $blockRules;
private $aSizeUnits;
private $iLineNo;
/**
* Parser constructor.
* Note that that iLineNo starts from 1 and not 0
*
* @param $sText
* @param Settings|null $oParserSettings
* @param int $iLineNo
*/
public function __construct($sText, Settings $oParserSettings = null, $iLineNo = 1) {
$this->sText = $sText;
$this->iCurrentPosition = 0;
$this->iLineNo = $iLineNo;
if ($oParserSettings === null) {
$oParserSettings = Settings::create();
}
$this->oParserSettings = $oParserSettings;
$this->blockRules = explode('/', AtRule::BLOCK_RULES);
foreach (explode('/', Size::ABSOLUTE_SIZE_UNITS.'/'.Size::RELATIVE_SIZE_UNITS.'/'.Size::NON_SIZE_UNITS) as $val) {
$iSize = strlen($val);
if(!isset($this->aSizeUnits[$iSize])) {
$this->aSizeUnits[$iSize] = array();
}
$this->aSizeUnits[$iSize][strtolower($val)] = $val;
}
ksort($this->aSizeUnits, SORT_NUMERIC);
}
public function setCharset($sCharset) {
$this->sCharset = $sCharset;
$this->aText = $this->strsplit($this->sText);
$this->iLength = count($this->aText);
}
public function getCharset() {
return $this->sCharset;
}
public function parse() {
$this->setCharset($this->oParserSettings->sDefaultCharset);
$oResult = new Document($this->iLineNo);
$this->parseDocument($oResult);
return $oResult;
}
private function parseDocument(Document $oDocument) {
$this->parseList($oDocument, true);
}
private function parseList(CSSList $oList, $bIsRoot = false) {
while (!$this->isEnd()) {
$comments = $this->consumeWhiteSpace();
$oListItem = null;
if($this->oParserSettings->bLenientParsing) {
try {
$oListItem = $this->parseListItem($oList, $bIsRoot);
} catch (UnexpectedTokenException $e) {
$oListItem = false;
}
} else {
$oListItem = $this->parseListItem($oList, $bIsRoot);
}
if($oListItem === null) {
// List parsing finished
return;
}
if($oListItem) {
$oListItem->setComments($comments);
$oList->append($oListItem);
}
}
if (!$bIsRoot) {
throw new SourceException("Unexpected end of document", $this->iLineNo);
}
}
private function parseListItem(CSSList $oList, $bIsRoot = false) {
if ($this->comes('@')) {
$oAtRule = $this->parseAtRule();
if($oAtRule instanceof Charset) {
if(!$bIsRoot) {
throw new UnexpectedTokenException('@charset may only occur in root document', '', 'custom', $this->iLineNo);
}
if(count($oList->getContents()) > 0) {
throw new UnexpectedTokenException('@charset must be the first parseable token in a document', '', 'custom', $this->iLineNo);
}
$this->setCharset($oAtRule->getCharset()->getString());
}
return $oAtRule;
} else if ($this->comes('}')) {
$this->consume('}');
if ($bIsRoot) {
throw new SourceException("Unopened {", $this->iLineNo);
} else {
return null;
}
} else {
return $this->parseSelector();
}
}
private function parseAtRule() {
$this->consume('@');
$sIdentifier = $this->parseIdentifier(false);
$iIdentifierLineNum = $this->iLineNo;
$this->consumeWhiteSpace();
if ($sIdentifier === 'import') {
$oLocation = $this->parseURLValue();
$this->consumeWhiteSpace();
$sMediaQuery = null;
if (!$this->comes(';')) {
$sMediaQuery = $this->consumeUntil(';');
}
$this->consume(';');
return new Import($oLocation, $sMediaQuery, $iIdentifierLineNum);
} else if ($sIdentifier === 'charset') {
$sCharset = $this->parseStringValue();
$this->consumeWhiteSpace();
$this->consume(';');
return new Charset($sCharset, $iIdentifierLineNum);
} else if ($this->identifierIs($sIdentifier, 'keyframes')) {
$oResult = new KeyFrame($iIdentifierLineNum);
$oResult->setVendorKeyFrame($sIdentifier);
$oResult->setAnimationName(trim($this->consumeUntil('{', false, true)));
$this->parseList($oResult);
return $oResult;
} else if ($sIdentifier === 'namespace') {
$sPrefix = null;
$mUrl = $this->parsePrimitiveValue();
if (!$this->comes(';')) {
$sPrefix = $mUrl;
$mUrl = $this->parsePrimitiveValue();
}
$this->consume(';');
if ($sPrefix !== null && !is_string($sPrefix)) {
throw new UnexpectedTokenException('Wrong namespace prefix', $sPrefix, 'custom', $iIdentifierLineNum);
}
if (!($mUrl instanceof CSSString || $mUrl instanceof URL)) {
throw new UnexpectedTokenException('Wrong namespace url of invalid type', $mUrl, 'custom', $iIdentifierLineNum);
}
return new CSSNamespace($mUrl, $sPrefix, $iIdentifierLineNum);
} else {
//Unknown other at rule (font-face or such)
$sArgs = trim($this->consumeUntil('{', false, true));
$bUseRuleSet = true;
foreach($this->blockRules as $sBlockRuleName) {
if($this->identifierIs($sIdentifier, $sBlockRuleName)) {
$bUseRuleSet = false;
break;
}
}
if($bUseRuleSet) {
$oAtRule = new AtRuleSet($sIdentifier, $sArgs, $iIdentifierLineNum);
$this->parseRuleSet($oAtRule);
} else {
$oAtRule = new AtRuleBlockList($sIdentifier, $sArgs, $iIdentifierLineNum);
$this->parseList($oAtRule);
}
return $oAtRule;
}
}
private function parseIdentifier($bAllowFunctions = true, $bIgnoreCase = true) {
$sResult = $this->parseCharacter(true);
if ($sResult === null) {
throw new UnexpectedTokenException($sResult, $this->peek(5), 'identifier', $this->iLineNo);
}
$sCharacter = null;
while (($sCharacter = $this->parseCharacter(true)) !== null) {
$sResult .= $sCharacter;
}
if ($bIgnoreCase) {
$sResult = $this->strtolower($sResult);
}
if ($bAllowFunctions && $this->comes('(')) {
$this->consume('(');
$aArguments = $this->parseValue(array('=', ' ', ','));
$sResult = new CSSFunction($sResult, $aArguments, ',', $this->iLineNo);
$this->consume(')');
}
return $sResult;
}
private function parseStringValue() {
$sBegin = $this->peek();
$sQuote = null;
if ($sBegin === "'") {
$sQuote = "'";
} else if ($sBegin === '"') {
$sQuote = '"';
}
if ($sQuote !== null) {
$this->consume($sQuote);
}
$sResult = "";
$sContent = null;
if ($sQuote === null) {
//Unquoted strings end in whitespace or with braces, brackets, parentheses
while (!preg_match('/[\\s{}()<>\\[\\]]/isu', $this->peek())) {
$sResult .= $this->parseCharacter(false);
}
} else {
while (!$this->comes($sQuote)) {
$sContent = $this->parseCharacter(false);
if ($sContent === null) {
throw new SourceException("Non-well-formed quoted string {$this->peek(3)}", $this->iLineNo);
}
$sResult .= $sContent;
}
$this->consume($sQuote);
}
return new CSSString($sResult, $this->iLineNo);
}
private function parseCharacter($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 = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u');
if ($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;
}
private function parseSelector() {
$aComments = array();
$oResult = new DeclarationBlock($this->iLineNo);
$oResult->setSelector($this->consumeUntil('{', false, true, $aComments));
$oResult->setComments($aComments);
$this->parseRuleSet($oResult);
return $oResult;
}
private function parseRuleSet($oRuleSet) {
while ($this->comes(';')) {
$this->consume(';');
}
while (!$this->comes('}')) {
$oRule = null;
if($this->oParserSettings->bLenientParsing) {
try {
$oRule = $this->parseRule();
} catch (UnexpectedTokenException $e) {
try {
$sConsume = $this->consumeUntil(array("\n", ";", '}'), true);
// We need to “unfind” the matches to the end of the ruleSet as this will be matched later
if($this->streql(substr($sConsume, -1), '}')) {
--$this->iCurrentPosition;
} else {
while ($this->comes(';')) {
$this->consume(';');
}
}
} catch (UnexpectedTokenException $e) {
// We’ve reached the end of the document. Just close the RuleSet.
return;
}
}
} else {
$oRule = $this->parseRule();
}
if($oRule) {
$oRuleSet->addRule($oRule);
}
}
$this->consume('}');
}
private function parseRule() {
$aComments = $this->consumeWhiteSpace();
$oRule = new Rule($this->parseIdentifier(), $this->iLineNo);
$oRule->setComments($aComments);
$oRule->addComments($this->consumeWhiteSpace());
$this->consume(':');
$oValue = $this->parseValue(self::listDelimiterForRule($oRule->getRule()));
$oRule->setValue($oValue);
if ($this->oParserSettings->bLenientParsing) {
while ($this->comes('\\')) {
$this->consume('\\');
$oRule->addIeHack($this->consume());
$this->consumeWhiteSpace();
}
}
if ($this->comes('!')) {
$this->consume('!');
$this->consumeWhiteSpace();
$this->consume('important');
$oRule->setIsImportant(true);
}
while ($this->comes(';')) {
$this->consume(';');
}
return $oRule;
}
private function parseValue($aListDelimiters) {
$aStack = array();
$this->consumeWhiteSpace();
//Build a list of delimiters and parsed values
while (!($this->comes('}') || $this->comes(';') || $this->comes('!') || $this->comes(')') || $this->comes('\\'))) {
if (count($aStack) > 0) {
$bFoundDelimiter = false;
foreach ($aListDelimiters as $sDelimiter) {
if ($this->comes($sDelimiter)) {
array_push($aStack, $this->consume($sDelimiter));
$this->consumeWhiteSpace();
$bFoundDelimiter = true;
break;
}
}
if (!$bFoundDelimiter) {
//Whitespace was the list delimiter
array_push($aStack, ' ');
}
}
array_push($aStack, $this->parsePrimitiveValue());
$this->consumeWhiteSpace();
}
//Convert the list to list objects
foreach ($aListDelimiters as $sDelimiter) {
if (count($aStack) === 1) {
return $aStack[0];
}
$iStartPosition = null;
while (($iStartPosition = array_search($sDelimiter, $aStack, true)) !== false) {
$iLength = 2; //Number of elements to be joined
for ($i = $iStartPosition + 2; $i < count($aStack); $i+=2, ++$iLength) {
if ($sDelimiter !== $aStack[$i]) {
break;
}
}
$oList = new RuleValueList($sDelimiter, $this->iLineNo);
for ($i = $iStartPosition - 1; $i - $iStartPosition + 1 < $iLength * 2; $i+=2) {
$oList->addListComponent($aStack[$i]);
}
array_splice($aStack, $iStartPosition - 1, $iLength * 2 - 1, array($oList));
}
}
return $aStack[0];
}
private static function listDelimiterForRule($sRule) {
if (preg_match('/^font($|-)/', $sRule)) {
return array(',', '/', ' ');
}
return array(',', ' ', '/');
}
private function parsePrimitiveValue() {
$oValue = null;
$this->consumeWhiteSpace();
if (is_numeric($this->peek()) || ($this->comes('-.') && is_numeric($this->peek(1, 2))) || (($this->comes('-') || $this->comes('.')) && is_numeric($this->peek(1, 1)))) {
$oValue = $this->parseNumericValue();
} else if ($this->comes('#') || $this->comes('rgb', true) || $this->comes('hsl', true)) {
$oValue = $this->parseColorValue();
} else if ($this->comes('url', true)) {
$oValue = $this->parseURLValue();
} else if ($this->comes("'") || $this->comes('"')) {
$oValue = $this->parseStringValue();
} else {
$oValue = $this->parseIdentifier(true, false);
}
$this->consumeWhiteSpace();
return $oValue;
}
private function parseNumericValue($bForColor = false) {
$sSize = '';
if ($this->comes('-')) {
$sSize .= $this->consume('-');
}
while (is_numeric($this->peek()) || $this->comes('.')) {
if ($this->comes('.')) {
$sSize .= $this->consume('.');
} else {
$sSize .= $this->consume(1);
}
}
$sUnit = null;
foreach ($this->aSizeUnits as $iLength => &$aValues) {
$sKey = strtolower($this->peek($iLength));
if(array_key_exists($sKey, $aValues)) {
if (($sUnit = $aValues[$sKey]) !== null) {
$this->consume($iLength);
break;
}
}
}
return new Size(floatval($sSize), $sUnit, $bForColor, $this->iLineNo);
}
private function parseColorValue() {
$aColor = array();
if ($this->comes('#')) {
$this->consume('#');
$sValue = $this->parseIdentifier(false);
if ($this->strlen($sValue) === 3) {
$sValue = $sValue[0] . $sValue[0] . $sValue[1] . $sValue[1] . $sValue[2] . $sValue[2];
}
$aColor = array('r' => new Size(intval($sValue[0] . $sValue[1], 16), null, true, $this->iLineNo), 'g' => new Size(intval($sValue[2] . $sValue[3], 16), null, true, $this->iLineNo), 'b' => new Size(intval($sValue[4] . $sValue[5], 16), null, true, $this->iLineNo));
} else {
$sColorMode = $this->parseIdentifier(false);
$this->consumeWhiteSpace();
$this->consume('(');
$iLength = $this->strlen($sColorMode);
for ($i = 0; $i < $iLength; ++$i) {
$this->consumeWhiteSpace();
$aColor[$sColorMode[$i]] = $this->parseNumericValue(true);
$this->consumeWhiteSpace();
if ($i < ($iLength - 1)) {
$this->consume(',');
}
}
$this->consume(')');
}
return new Color($aColor, $this->iLineNo);
}
private function parseURLValue() {
$bUseUrl = $this->comes('url', true);
if ($bUseUrl) {
$this->consume('url');
$this->consumeWhiteSpace();
$this->consume('(');
}
$this->consumeWhiteSpace();
$oResult = new URL($this->parseStringValue(), $this->iLineNo);
if ($bUseUrl) {
$this->consumeWhiteSpace();
$this->consume(')');
}
return $oResult;
}
/**
* Tests an identifier for a given value. Since identifiers are all keywords, they can be vendor-prefixed. We need to check for these versions too.
*/
private function identifierIs($sIdentifier, $sMatch) {
return (strcasecmp($sIdentifier, $sMatch) === 0)
?: preg_match("/^(-\\w+-)?$sMatch$/i", $sIdentifier) === 1;
}
private function comes($sString, $bCaseInsensitive = false) {
$sPeek = $this->peek(strlen($sString));
return ($sPeek == '')
? false
: $this->streql($sPeek, $sString, $bCaseInsensitive);
}
private function peek($iLength = 1, $iOffset = 0) {
$iOffset += $this->iCurrentPosition;
if ($iOffset >= $this->iLength) {
return '';
}
return $this->substr($iOffset, $iLength);
}
private function consume($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 > $this->iLength) {
throw new UnexpectedTokenException($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 $sResult;
}
}
private function consumeExpression($mExpression) {
$aMatches = null;
if (preg_match($mExpression, $this->inputLeft(), $aMatches, PREG_OFFSET_CAPTURE) === 1) {
return $this->consume($aMatches[0][0]);
}
throw new UnexpectedTokenException($mExpression, $this->peek(5), 'expression', $this->iLineNo);
}
private function consumeWhiteSpace() {
$comments = array();
do {
while (preg_match('/\\s/isSu', $this->peek()) === 1) {
$this->consume(1);
}
if($this->oParserSettings->bLenientParsing) {
try {
$oComment = $this->consumeComment();
} catch(UnexpectedTokenException $e) {
// When we can’t find the end of a comment, we assume the document is finished.
$this->iCurrentPosition = $this->iLength;
return;
}
} else {
$oComment = $this->consumeComment();
}
if ($oComment !== false) {
$comments[] = $oComment;
}
} while($oComment !== false);
return $comments;
}
/**
* @return false|Comment
*/
private 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;
}
private function isEnd() {
return $this->iCurrentPosition >= $this->iLength;
}
private function consumeUntil($aEnd, $bIncludeEnd = false, $consumeEnd = false, array &$comments = array()) {
$aEnd = is_array($aEnd) ? $aEnd : array($aEnd);
$out = '';
$start = $this->iCurrentPosition;
while (($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;
}
}
$this->iCurrentPosition = $start;
throw new UnexpectedTokenException('One of ("'.implode('","', $aEnd).'")', $this->peek(5), 'search', $this->iLineNo);
}
private function inputLeft() {
return $this->substr($this->iCurrentPosition, -1);
}
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 $sResult;
}
private function strlen($sString) {
if ($this->oParserSettings->bMultibyteSupport) {
return mb_strlen($sString, $this->sCharset);
} else {
return strlen($sString);
}
}
private function streql($sString1, $sString2, $bCaseInsensitive = true) {
if($bCaseInsensitive) {
return $this->strtolower($sString1) === $this->strtolower($sString2);
} else {
return $sString1 === $sString2;
}
}
private function strtolower($sString) {
if ($this->oParserSettings->bMultibyteSupport) {
return mb_strtolower($sString, $this->sCharset);
} else {
return strtolower($sString);
}
}
private function strsplit($sString) {
if ($this->oParserSettings->bMultibyteSupport) {
if ($this->streql($this->sCharset, 'utf-8')) {
return preg_split('//u', $sString, null, PREG_SPLIT_NO_EMPTY);
} else {
$iLength = mb_strlen($sString, $this->sCharset);
$aResult = array();
for ($i = 0; $i < $iLength; ++$i) {
$aResult[] = mb_substr($sString, $i, 1, $this->sCharset);
}
return $aResult;
}
} else {
if($sString === '') {
return array();
} else {
return str_split($sString);
}
}
}
private function strpos($sString, $sNeedle, $iOffset) {
if ($this->oParserSettings->bMultibyteSupport) {
return mb_strpos($sString, $sNeedle, $iOffset, $this->sCharset);
} else {
return strpos($sString, $sNeedle, $iOffset);
}
}
}
Zerion Mini Shell 1.0