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<?php |
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declare(strict_types=1); |
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namespace Spiral\Stempler\Lexer\Grammar; |
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use Spiral\Stempler\Lexer\Buffer; |
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use Spiral\Stempler\Lexer\Byte; |
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use Spiral\Stempler\Lexer\Grammar\Traits\TokenTrait; |
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use Spiral\Stempler\Lexer\GrammarInterface; |
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use Spiral\Stempler\Lexer\Token; |
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/** |
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* @see https://html.spec.whatwg.org/multipage/syntax.htm |
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*/ |
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final class HTMLGrammar implements GrammarInterface |
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{ |
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use TokenTrait; |
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// HTML grammar tokens |
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public const TYPE_RAW = 0; |
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public const TYPE_KEYWORD = 1; |
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public const TYPE_OPEN = 2; |
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public const TYPE_OPEN_SHORT = 3; |
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public const TYPE_CLOSE = 4; |
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public const TYPE_CLOSE_SHORT = 5; |
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public const TYPE_EQUAL = 6; |
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public const TYPE_ATTRIBUTE = 7; |
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public const TYPE_WHITESPACE = 9; |
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public const TYPE_VERBATIM = 10; |
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// Content within given tags must not be parsed |
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private const VERBATIM_TAGS = ['script', 'canvas', 'style']; |
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// whitespace |
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private const REGEXP_WHITESPACE = '/\\s/'; |
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// Allowed keyword characters. |
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private const REGEXP_KEYWORD = '/[a-z0-9_\\-:\\.]/ui'; |
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private array $whitespace = []; |
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/** |
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* @var array<array-key, Byte|Token>|array{0: Byte} |
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*/ |
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private array $attribute = []; |
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private array $keyword = []; |
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public function parse(Buffer $src): \Generator |
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{ |
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while ($n = $src->next()) { |
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if (!$n instanceof Byte || $n->char !== '<') { |
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yield $n; |
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continue; |
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} |
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// work with isolated token stream! |
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$tag = (clone $this)->parseGrammar($src); |
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if ($tag === null) { |
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yield $n; |
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$src->replay($n->offset); |
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continue; |
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} |
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$tagName = $this->tagName($tag); |
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// todo: add support for custom tag list |
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if (\in_array($tagName, self::VERBATIM_TAGS)) { |
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yield from $tag; |
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yield from $this->parseVerbatim($src, $tagName); |
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continue; |
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} |
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yield from $tag; |
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} |
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} |
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/** |
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* @codeCoverageIgnore |
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*/ |
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public static function tokenName(int $token): string |
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{ |
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return match ($token) { |
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self::TYPE_RAW => 'HTML:RAW', |
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self::TYPE_KEYWORD => 'HTML:KEYWORD', |
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self::TYPE_OPEN => 'HTML:OPEN_TAG', |
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self::TYPE_OPEN_SHORT => 'HTML:OPEN_SHORT_TAG', |
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self::TYPE_CLOSE => 'HTML:CLOSE_TAG', |
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self::TYPE_CLOSE_SHORT => 'HTML:CLOSE_SHORT_TAG', |
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self::TYPE_EQUAL => 'HTML:EQUAL', |
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self::TYPE_ATTRIBUTE => 'HTML:ATTRIBUTE', |
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self::TYPE_WHITESPACE => 'HTML:WHITESPACE', |
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self::TYPE_VERBATIM => 'HTML:VERBATIM', |
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default => 'HTML:UNDEFINED', |
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}; |
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} |
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private function parseVerbatim(Buffer $src, string $verbatim): \Generator |
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{ |
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$chunks = []; |
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while ($n = $src->next()) { |
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if ($n instanceof Token) { |
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$chunks[] = $n; |
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continue; |
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} |
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switch ($n->char) { |
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case '"': |
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case "'": |
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case '`': |
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$chunks[] = $n; |
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// language inclusions allow nested strings |
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while ($nc = $src->next()) { |
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$chunks[] = $nc; |
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if ($nc instanceof Token) { |
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continue; |
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} |
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if ($nc->char === $n->char) { |
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break; |
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} |
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} |
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break; |
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case '/': |
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$chunks[] = $n; |
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$multiline = false; |
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if ($src->lookaheadByte(1) === '/' || $src->lookaheadByte(1) === '*') { |
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if ($src->lookaheadByte(1) === '*') { |
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$multiline = true; |
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} |
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$chunks[] = $src->next(); |
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// language inclusions allow nested strings |
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while ($nc = $src->next()) { |
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if ($nc instanceof Token) { |
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continue; |
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} |
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if ($nc->char === '<') { |
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$tag = (clone $this)->parseGrammar($src); |
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if ($tag === null || $this->tagName($tag) !== $verbatim) { |
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$src->replay($n->offset); |
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break; |
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} |
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// back to primary loop |
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$src->replay($nc->offset - 1); |
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break 2; |
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} |
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$chunks[] = $nc; |
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if ($multiline) { |
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if ($nc->char === '*' && $src->lookaheadByte(1) === '/') { |
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$chunks[] = $src->next(); |
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break; |
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} |
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} elseif ($nc->char === "\n") { |
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break; |
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} |
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} |
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} |
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break; |
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case '<': |
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// tag beginning? |
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$tag = (clone $this)->parseGrammar($src); |
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if ($tag === null || $this->tagName($tag) !== $verbatim) { |
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$chunks[] = $n; |
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$src->replay($n->offset); |
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break; |
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} |
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// found closing verbatim tag |
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yield $this->packToken($chunks, self::TYPE_VERBATIM); |
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yield from $tag; |
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break 2; |
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default: |
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$chunks[] = $n; |
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} |
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} |
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} |
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private function tagName(array $tag): string |
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{ |
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foreach ($tag as $token) { |
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if ($token->type === self::TYPE_KEYWORD) { |
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return \strtolower($token->content); |
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} |
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} |
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return ''; |
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} |
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/** |
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* TODO issue #767 |
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* @link https://github.com/spiral/framework/issues/767 |
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* @psalm-suppress UndefinedPropertyFetch |
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*/ |
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private function parseGrammar(Buffer $src): ?array |
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{ |
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$this->tokens = [ |
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new Token(self::TYPE_OPEN, $src->getOffset(), '<'), |
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]; |
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if ($src->lookaheadByte() === '/') { |
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$this->tokens[0]->type = self::TYPE_OPEN_SHORT; |
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$this->tokens[0]->content .= $src->next()->char; |
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} |
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while ($n = $src->next()) { |
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if ($this->attribute !== []) { |
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$this->attribute[] = $n; |
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if ($n instanceof Byte && $n->char === $this->attribute[0]->char) { |
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$this->flushAttribute(); |
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} |
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continue; |
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} |
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if ($n instanceof Token) { |
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$this->keyword[] = $n; |
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continue; |
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} |
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137 |
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switch ($n->char) { |
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case '"': |
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case "'": |
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case '`': |
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$this->flush(); |
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$this->attribute[] = $n; |
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break; |
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case '=': |
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$this->flush(); |
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$this->tokens[] = new Token( |
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self::TYPE_EQUAL, |
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$n->offset, |
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$n->char |
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); |
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break; |
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case '/': |
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if ($src->lookaheadByte() === '>') { |
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$this->flush(); |
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$this->tokens[] = new Token( |
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self::TYPE_CLOSE_SHORT, |
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$n->offset, |
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$n->char . $src->next()->char |
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); |
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260
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break 2; |
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} |
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263
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// unexpected "/" |
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return null; |
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266
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case '>': |
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$this->flush(); |
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$this->tokens[] = new Token( |
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self::TYPE_CLOSE, |
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$n->offset, |
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$n->char |
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); |
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break 2; |
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default: |
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if (\preg_match(self::REGEXP_WHITESPACE, $n->char)) { |
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$this->flushKeyword(); |
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$this->whitespace[] = $n; |
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break; |
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} |
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$this->flushWhitespace(); |
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284
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if (!\preg_match(self::REGEXP_KEYWORD, $n->char)) { |
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// unexpected char |
286
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return null; |
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} |
288
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289
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130 |
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$this->keyword[] = $n; |
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} |
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} |
292
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293
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134 |
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if (!$this->isValid()) { |
294
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7 |
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return null; |
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} |
296
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297
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127 |
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return $this->tokens; |
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} |
299
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300
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134 |
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private function isValid(): bool |
301
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{ |
302
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// tag is too short or does not have name keyword |
303
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134 |
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if (\count($this->tokens) < 3) { |
304
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2 |
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return false; |
305
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} |
306
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307
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132 |
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$last = $this->tokens[\count($this->tokens) - 1]; |
308
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132 |
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if ($last->type !== self::TYPE_CLOSE && $last->type !== self::TYPE_CLOSE_SHORT) { |
309
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2 |
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return false; |
310
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} |
311
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312
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130 |
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foreach ($this->tokens as $token) { |
313
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130 |
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switch ($token->type) { |
314
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case self::TYPE_WHITESPACE: |
315
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// ignore |
316
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3 |
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continue 2; |
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318
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case self::TYPE_ATTRIBUTE: |
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case self::TYPE_EQUAL: |
320
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3 |
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return false; |
321
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322
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case self::TYPE_KEYWORD: |
323
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127 |
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return true; |
324
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} |
325
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} |
326
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327
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return false; |
328
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} |
329
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330
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/** |
331
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* Flush whitespace or keyword tokens. |
332
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*/ |
333
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135 |
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private function flush(): void |
334
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{ |
335
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135 |
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$this->flushWhitespace(); |
336
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135 |
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$this->flushKeyword(); |
337
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} |
338
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339
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/** |
340
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* Flush keyword content. |
341
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*/ |
342
|
137 |
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private function flushWhitespace(): void |
343
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{ |
344
|
137 |
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if ($this->whitespace === []) { |
345
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137 |
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return; |
346
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} |
347
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348
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96 |
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$this->tokens[] = $this->packToken($this->whitespace, self::TYPE_WHITESPACE); |
349
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96 |
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$this->whitespace = []; |
350
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} |
351
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352
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/** |
353
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* Flush keyword content. |
354
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*/ |
355
|
135 |
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private function flushKeyword(): void |
356
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{ |
357
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135 |
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if ($this->keyword === []) { |
358
|
98 |
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return; |
359
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} |
360
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361
|
132 |
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$this->tokens[] = $this->packToken($this->keyword, self::TYPE_KEYWORD); |
362
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132 |
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$this->keyword = []; |
363
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} |
364
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365
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/** |
366
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* Flush attribute content. |
367
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*/ |
368
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93 |
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private function flushAttribute(): void |
369
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{ |
370
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93 |
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if ($this->attribute === []) { |
371
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return; |
372
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} |
373
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374
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93 |
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$this->tokens[] = $this->packToken($this->attribute, self::TYPE_ATTRIBUTE); |
375
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93 |
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$this->attribute = []; |
376
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} |
377
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} |
378
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