Code Duplication    Length = 8-8 lines in 2 locations

src/AttributeNode.php 2 locations

@@ 45-52 (lines=8) @@
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    /**
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     * @return null|AttributeNode
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     */
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    public function previousSibling()
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    {
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        if (null === $parent = $this->parent) {
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            return null;
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        }
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        return $this->getSibling($parent->getAttributes(), -1);
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    }
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    /**
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     * @return null|AttributeNode
@@ 57-64 (lines=8) @@
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    /**
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     * @return null|AttributeNode
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     */
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    public function nextSibling()
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    {
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        if (null === $parent = $this->parent) {
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            return null;
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        }
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        return $this->getSibling($parent->getAttributes(), 1);
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    }
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}
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