[String] Fix Notice when argument is empty string

Author: moldman

.gitattributes

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+/Tests export-ignore
+/phpunit.xml.dist export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore

.gitignore

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+vendor/
+composer.lock
+phpunit.xml

CHANGELOG.md

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+CHANGELOG
+=========
+
+4.4.0
+-----
+
+ * Added support for `*:only-of-type`
+
+2.8.0
+-----
+
+ * Added the `CssSelectorConverter` class as a non-static API for the component.
+ * Deprecated the `CssSelector` static API of the component.
+
+2.1.0
+-----
+
+ * none

CssSelectorConverter.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector;
+
+use Symfony\Component\CssSelector\Parser\Shortcut\ClassParser;
+use Symfony\Component\CssSelector\Parser\Shortcut\ElementParser;
+use Symfony\Component\CssSelector\Parser\Shortcut\EmptyStringParser;
+use Symfony\Component\CssSelector\Parser\Shortcut\HashParser;
+use Symfony\Component\CssSelector\XPath\Extension\HtmlExtension;
+use Symfony\Component\CssSelector\XPath\Translator;
+
+/**
+ * CssSelectorConverter is the main entry point of the component and can convert CSS
+ * selectors to XPath expressions.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class CssSelectorConverter
+{
+    private $translator;
+    private $cache;
+
+    private static $xmlCache = [];
+    private static $htmlCache = [];
+
+    /**
+     * @param bool $html Whether HTML support should be enabled. Disable it for XML documents
+     */
+    public function __construct(bool $html = true)
+    {
+        $this->translator = new Translator();
+
+        if ($html) {
+            $this->translator->registerExtension(new HtmlExtension($this->translator));
+            $this->cache = &self::$htmlCache;
+        } else {
+            $this->cache = &self::$xmlCache;
+        }
+
+        $this->translator
+            ->registerParserShortcut(new EmptyStringParser())
+            ->registerParserShortcut(new ElementParser())
+            ->registerParserShortcut(new ClassParser())
+            ->registerParserShortcut(new HashParser())
+        ;
+    }
+
+    /**
+     * Translates a CSS expression to its XPath equivalent.
+     *
+     * Optionally, a prefix can be added to the resulting XPath
+     * expression with the $prefix parameter.
+     *
+     * @return string
+     */
+    public function toXPath(string $cssExpr, string $prefix = 'descendant-or-self::')
+    {
+        return $this->cache[$prefix][$cssExpr] ?? $this->cache[$prefix][$cssExpr] = $this->translator->cssToXPath($cssExpr, $prefix);
+    }
+}

Exception/ExceptionInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Exception;
+
+/**
+ * Interface for exceptions.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ */
+interface ExceptionInterface extends \Throwable
+{
+}

Exception/ExpressionErrorException.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Exception;
+
+/**
+ * ParseException is thrown when a CSS selector syntax is not valid.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ */
+class ExpressionErrorException extends ParseException
+{
+}

Exception/InternalErrorException.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Exception;
+
+/**
+ * ParseException is thrown when a CSS selector syntax is not valid.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ */
+class InternalErrorException extends ParseException
+{
+}

Exception/ParseException.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Exception;
+
+/**
+ * ParseException is thrown when a CSS selector syntax is not valid.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ParseException extends \Exception implements ExceptionInterface
+{
+}

Exception/SyntaxErrorException.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\CssSelector\Exception;
+
+use Symfony\Component\CssSelector\Parser\Token;
+
+/**
+ * ParseException is thrown when a CSS selector syntax is not valid.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ */
+class SyntaxErrorException extends ParseException
+{
+    /**
+     * @return self
+     */
+    public static function unexpectedToken(string $expectedValue, Token $foundToken)
+    {
+        return new self(sprintf('Expected %s, but %s found.', $expectedValue, $foundToken));
+    }
+
+    /**
+     * @return self
+     */
+    public static function pseudoElementFound(string $pseudoElement, string $unexpectedLocation)
+    {
+        return new self(sprintf('Unexpected pseudo-element "::%s" found %s.', $pseudoElement, $unexpectedLocation));
+    }
+
+    /**
+     * @return self
+     */
+    public static function unclosedString(int $position)
+    {
+        return new self(sprintf('Unclosed/invalid string at %s.', $position));
+    }
+
+    /**
+     * @return self
+     */
+    public static function nestedNot()
+    {
+        return new self('Got nested ::not().');
+    }
+
+    /**
+     * @return self
+     */
+    public static function stringAsFunctionArgument()
+    {
+        return new self('String not allowed as function argument.');
+    }
+}

LICENSE

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+Copyright (c) 2004-2020 Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.