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<?php
namespace Sabberworm\CSS\Value;
use Sabberworm\CSS\Parsing\ParserState;
use Sabberworm\CSS\Parsing\SourceException;
use Sabberworm\CSS\Parsing\UnexpectedEOFException;
use Sabberworm\CSS\Parsing\UnexpectedTokenException;
use Sabberworm\CSS\Renderable;
/**
* Abstract base class for specific classes of CSS values: `Size`, `Color`, `CSSString` and `URL`, and another
* abstract subclass `ValueList`.
*/
abstract class Value implements Renderable
{
/**
* @var int
*/
protected $iLineNo;
/**
* @param int $iLineNo
*/
public function __construct($iLineNo = 0)
{
$this->iLineNo = $iLineNo;
}
/**
* @param array<array-key, string> $aListDelimiters
*
* @return RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string
*
* @throws UnexpectedTokenException
* @throws UnexpectedEOFException
*/
public static function parseValue(ParserState $oParserState, array $aListDelimiters = [])
{
/** @var array<int, RuleValueList|CSSFunction|CSSString|LineName|Size|URL|string> $aStack */
$aStack = [];
$oParserState->consumeWhiteSpace();
//Build a list of delimiters and parsed values
while (
!($oParserState->comes('}') || $oParserState->comes(';') || $oParserState->comes('!')
|| $oParserState->comes(')')
|| $oParserState->comes('\\')
|| $oParserState->isEnd())
) {
if (count($aStack) > 0) {
$bFoundDelimiter = false;
foreach ($aListDelimiters as $sDelimiter) {
if ($oParserState->comes($sDelimiter)) {
array_push($aStack, $oParserState->consume($sDelimiter));
$oParserState->consumeWhiteSpace();
$bFoundDelimiter = true;
break;
}
}
if (!$bFoundDelimiter) {
//Whitespace was the list delimiter
array_push($aStack, ' ');
}
}
array_push($aStack, self::parsePrimitiveValue($oParserState));
$oParserState->consumeWhiteSpace();
}
// Convert the list to list objects
foreach ($aListDelimiters as $sDelimiter) {
$iStackLength = count($aStack);
if ($iStackLength === 1) {
return $aStack[0];
}
$aNewStack = [];
for ($iStartPosition = 0; $iStartPosition < $iStackLength; ++$iStartPosition) {
if ($iStartPosition === ($iStackLength - 1) || $sDelimiter !== $aStack[$iStartPosition + 1]) {
$aNewStack[] = $aStack[$iStartPosition];
continue;
}
$iLength = 2; //Number of elements to be joined
for ($i = $iStartPosition + 3; $i < $iStackLength; $i += 2, ++$iLength) {
if ($sDelimiter !== $aStack[$i]) {
break;
}
}
$oList = new RuleValueList($sDelimiter, $oParserState->currentLine());
for ($i = $iStartPosition; $i - $iStartPosition < $iLength * 2; $i += 2) {
$oList->addListComponent($aStack[$i]);
}
$aNewStack[] = $oList;
$iStartPosition += $iLength * 2 - 2;
}
$aStack = $aNewStack;
}
if (!isset($aStack[0])) {
throw new UnexpectedTokenException(
" {$oParserState->peek()} ",
$oParserState->peek(1, -1) . $oParserState->peek(2),
'literal',
$oParserState->currentLine()
);
}
return $aStack[0];
}
/**
* @param bool $bIgnoreCase
*
* @return CSSFunction|string
*
* @throws UnexpectedEOFException
* @throws UnexpectedTokenException
*/
public static function parseIdentifierOrFunction(ParserState $oParserState, $bIgnoreCase = false)
{
$oAnchor = $oParserState->anchor();
$mResult = $oParserState->parseIdentifier($bIgnoreCase);
if ($oParserState->comes('(')) {
$oAnchor->backtrack();
if ($oParserState->streql('url', $mResult)) {
$mResult = URL::parse($oParserState);
} elseif (
$oParserState->streql('calc', $mResult)
|| $oParserState->streql('-webkit-calc', $mResult)
|| $oParserState->streql('-moz-calc', $mResult)
) {
$mResult = CalcFunction::parse($oParserState);
} else {
$mResult = CSSFunction::parse($oParserState, $bIgnoreCase);
}
}
return $mResult;
}
/**
* @return CSSFunction|CSSString|LineName|Size|URL|string
*
* @throws UnexpectedEOFException
* @throws UnexpectedTokenException
* @throws SourceException
*/
public static function parsePrimitiveValue(ParserState $oParserState)
{
$oValue = null;
$oParserState->consumeWhiteSpace();
if (
is_numeric($oParserState->peek())
|| ($oParserState->comes('-.')
&& is_numeric($oParserState->peek(1, 2)))
|| (($oParserState->comes('-') || $oParserState->comes('.')) && is_numeric($oParserState->peek(1, 1)))
) {
$oValue = Size::parse($oParserState);
} elseif ($oParserState->comes('#') || $oParserState->comes('rgb', true) || $oParserState->comes('hsl', true)) {
$oValue = Color::parse($oParserState);
} elseif ($oParserState->comes("'") || $oParserState->comes('"')) {
$oValue = CSSString::parse($oParserState);
} elseif ($oParserState->comes("progid:") && $oParserState->getSettings()->bLenientParsing) {
$oValue = self::parseMicrosoftFilter($oParserState);
} elseif ($oParserState->comes("[")) {
$oValue = LineName::parse($oParserState);
} elseif ($oParserState->comes("U+")) {
$oValue = self::parseUnicodeRangeValue($oParserState);
} else {
$sNextChar = $oParserState->peek(1);
try {
$oValue = self::parseIdentifierOrFunction($oParserState);
} catch (UnexpectedTokenException $e) {
if (\in_array($sNextChar, ['+', '-', '*', '/'], true)) {
$oValue = $oParserState->consume(1);
} else {
throw $e;
}
}
}
$oParserState->consumeWhiteSpace();
return $oValue;
}
/**
* @return CSSFunction
*
* @throws UnexpectedEOFException
* @throws UnexpectedTokenException
*/
private static function parseMicrosoftFilter(ParserState $oParserState)
{
$sFunction = $oParserState->consumeUntil('(', false, true);
$aArguments = Value::parseValue($oParserState, [',', '=']);
return new CSSFunction($sFunction, $aArguments, ',', $oParserState->currentLine());
}
/**
* @return string
*
* @throws UnexpectedEOFException
* @throws UnexpectedTokenException
*/
private static function parseUnicodeRangeValue(ParserState $oParserState)
{
$iCodepointMaxLength = 6; // Code points outside BMP can use up to six digits
$sRange = "";
$oParserState->consume("U+");
do {
if ($oParserState->comes('-')) {
$iCodepointMaxLength = 13; // Max length is 2 six digit code points + the dash(-) between them
}
$sRange .= $oParserState->consume(1);
} while (strlen($sRange) < $iCodepointMaxLength && preg_match("/[A-Fa-f0-9\?-]/", $oParserState->peek()));
return "U+{$sRange}";
}
/**
* @return int
*/
public function getLineNo()
{
return $this->iLineNo;
}
}
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