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<?php |
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/** |
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* Copyright (c) 2017–2018 Ryan Parman <http://ryanparman.com>. |
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* Copyright (c) 2017–2018 Contributors. |
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* |
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* http://opensource.org/licenses/Apache2.0 |
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*/ |
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declare(strict_types=1); |
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namespace SimplePie\Middleware\Xml; |
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use SimplePie\Middleware\AbstractMiddleware; |
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use SimplePie\Type\Node; |
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abstract class AbstractXmlMiddleware extends AbstractMiddleware |
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{ |
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/** |
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* Replace all instances of `%s` with the `$namespaceAlias` parameter. |
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* |
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* This is similar to `sprintf()`, but the `$namespaceAlias` is applied to _all_ instances of `%s`. |
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* |
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* @param string $query An XPath query where `%s` is used in-place of the XML namespace alias. |
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* @param string $namespaceAlias The XML namespace alias to apply. |
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* |
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* @return string |
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*/ |
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public function applyNsToQuery(string $query, string $namespaceAlias): string |
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{ |
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return \str_replace('%s', $namespaceAlias, $query); |
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} |
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/** |
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* Produce an XPath 1.0 expression which is used to query XML document nodes. |
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* |
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* @param string $namespaceAlias The XML namespace alias to apply. |
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* @param string ...$path A variadic parameter which accepts the names of the XML |
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* tree nodes in sequence. |
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* |
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* @return string An XPath 1.0 expression. |
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* |
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* @see https://wiki.php.net/rfc/variadics |
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* @see http://php.net/manual/en/functions.arguments.php#functions.variable-arg-list |
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*/ |
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public function generateQuery(string $namespaceAlias, string ...$path): string |
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{ |
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$query = ''; |
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foreach ($path as $p) { |
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$query .= \sprintf( |
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'/%s:*[translate(name(), \'%s\', \'%s\') = \'%s\']', |
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$namespaceAlias, |
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'ABCDEFGHIJKLMNOPQRSTUVWXYZ', |
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'abcdefghijklmnopqrstuvwxyz', |
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$p |
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); |
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} |
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return $query; |
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} |
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/** |
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* Some elements in the feed should only have one result. This handles those cases. |
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* |
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* @param callable $fn A callable which returns a `DOMElementList`. |
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* |
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* @return array Returns an array with keys of `text` and `html`. |
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*/ |
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public function handleSingleNode(callable $fn): Node |
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{ |
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$nodes = $fn(); |
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if ($nodes->length > 0) { |
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return new Node($nodes[0]); |
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} |
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return new Node(); |
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} |
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} |
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simplepie /
simplepie-ng
