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<?php
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namespace Sabberworm\CSS\Value;
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use Sabberworm\CSS\Parsing\ParserState;
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use Sabberworm\CSS\Parsing\SourceException;
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use Sabberworm\CSS\Parsing\UnexpectedEOFException;
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use Sabberworm\CSS\Parsing\UnexpectedTokenException;
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use Sabberworm\CSS\Renderable;
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abstract class Value implements Renderable
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{
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/**
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* @var int
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*/
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protected $iLineNo;
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/**
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* @param int $iLineNo
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*/
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public function __construct($iLineNo = 0)
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{
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$this->iLineNo = $iLineNo;
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}
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/**
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* @param array<array-key, string> $aListDelimiters
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*
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* @return RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string
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*
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* @throws UnexpectedTokenException
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* @throws UnexpectedEOFException
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*/
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public static function parseValue(ParserState $oParserState, array $aListDelimiters = [])
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{
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/** @var array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aStack */
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$aStack = [];
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$oParserState->consumeWhiteSpace();
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//Build a list of delimiters and parsed values
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while (
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!($oParserState->comes('}') || $oParserState->comes(';') || $oParserState->comes('!')
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|| $oParserState->comes(')')
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|| $oParserState->comes('\\'))
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) {
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if (count($aStack) > 0) {
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$bFoundDelimiter = false;
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foreach ($aListDelimiters as $sDelimiter) {
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if ($oParserState->comes($sDelimiter)) {
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array_push($aStack, $oParserState->consume($sDelimiter));
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$oParserState->consumeWhiteSpace();
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$bFoundDelimiter = true;
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break;
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}
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}
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if (!$bFoundDelimiter) {
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//Whitespace was the list delimiter
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array_push($aStack, ' ');
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}
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}
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array_push($aStack, self::parsePrimitiveValue($oParserState));
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$oParserState->consumeWhiteSpace();
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}
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// Convert the list to list objects
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foreach ($aListDelimiters as $sDelimiter) {
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if (count($aStack) === 1) {
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return $aStack[0];
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}
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$iStartPosition = null;
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while (($iStartPosition = array_search($sDelimiter, $aStack, true)) !== false) {
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$iLength = 2; //Number of elements to be joined
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for ($i = $iStartPosition + 2; $i < count($aStack); $i += 2, ++$iLength) {
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if ($sDelimiter !== $aStack[$i]) {
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break;
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}
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}
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$oList = new RuleValueList($sDelimiter, $oParserState->currentLine());
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for ($i = $iStartPosition - 1; $i - $iStartPosition + 1 < $iLength * 2; $i += 2) {
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$oList->addListComponent($aStack[$i]);
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}
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array_splice($aStack, $iStartPosition - 1, $iLength * 2 - 1, [$oList]);
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}
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}
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if (!isset($aStack[0])) {
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throw new UnexpectedTokenException(
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" {$oParserState->peek()} ",
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$oParserState->peek(1, -1) . $oParserState->peek(2),
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'literal',
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$oParserState->currentLine()
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);
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}
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return $aStack[0];
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}
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/**
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* @param bool $bIgnoreCase
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*
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* @return CSSFunction|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 static function parseIdentifierOrFunction(ParserState $oParserState, $bIgnoreCase = false)
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{
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$sResult = $oParserState->parseIdentifier($bIgnoreCase);
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if ($oParserState->comes('(')) {
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$oParserState->consume('(');
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$aArguments = Value::parseValue($oParserState, ['=', ' ', ',']);
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$sResult = new CSSFunction($sResult, $aArguments, ',', $oParserState->currentLine());
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$oParserState->consume(')');
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}
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return $sResult;
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}
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/**
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* @return CSSFunction|CSSString|LineName|Size|URL|string
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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* @throws SourceException
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*/
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public static function parsePrimitiveValue(ParserState $oParserState)
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{
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$oValue = null;
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$oParserState->consumeWhiteSpace();
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if (
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is_numeric($oParserState->peek())
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|| ($oParserState->comes('-.')
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&& is_numeric($oParserState->peek(1, 2)))
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|| (($oParserState->comes('-') || $oParserState->comes('.')) && is_numeric($oParserState->peek(1, 1)))
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) {
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$oValue = Size::parse($oParserState);
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} elseif ($oParserState->comes('#') || $oParserState->comes('rgb', true) || $oParserState->comes('hsl', true)) {
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$oValue = Color::parse($oParserState);
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} elseif ($oParserState->comes('url', true)) {
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$oValue = URL::parse($oParserState);
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} elseif (
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$oParserState->comes('calc', true) || $oParserState->comes('-webkit-calc', true)
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|| $oParserState->comes('-moz-calc', true)
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) {
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$oValue = CalcFunction::parse($oParserState);
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} elseif ($oParserState->comes("'") || $oParserState->comes('"')) {
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$oValue = CSSString::parse($oParserState);
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} elseif ($oParserState->comes("progid:") && $oParserState->getSettings()->bLenientParsing) {
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$oValue = self::parseMicrosoftFilter($oParserState);
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} elseif ($oParserState->comes("[")) {
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$oValue = LineName::parse($oParserState);
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} elseif ($oParserState->comes("U+")) {
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$oValue = self::parseUnicodeRangeValue($oParserState);
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} else {
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$oValue = self::parseIdentifierOrFunction($oParserState);
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}
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$oParserState->consumeWhiteSpace();
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return $oValue;
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}
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/**
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* @return CSSFunction
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*
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* @throws UnexpectedEOFException
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* @throws UnexpectedTokenException
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*/
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private static function parseMicrosoftFilter(ParserState $oParserState)
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{
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$sFunction = $oParserState->consumeUntil('(', false, true);
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$aArguments = Value::parseValue($oParserState, [',', '=']);
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return new CSSFunction($sFunction, $aArguments, ',', $oParserState->currentLine());
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}
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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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private static function parseUnicodeRangeValue(ParserState $oParserState)
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{
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$iCodepointMaxLength = 6; // Code points outside BMP can use up to six digits
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$sRange = "";
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$oParserState->consume("U+");
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do {
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if ($oParserState->comes('-')) {
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$iCodepointMaxLength = 13; // Max length is 2 six digit code points + the dash(-) between them
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}
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$sRange .= $oParserState->consume(1);
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} while (strlen($sRange) < $iCodepointMaxLength && preg_match("/[A-Fa-f0-9\?-]/", $oParserState->peek()));
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return "U+{$sRange}";
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}
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/**
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* @return int
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*/
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public function getLineNo()
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{
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return $this->iLineNo;
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}
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}
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