Fix: Analysis of relative links (Node.php)

1 Cannot use the "Link" object to analyze relative links
Because the "Link" for the Atom feed will be corrupted.
Use the additionally created "LinkForAnalysis" object

2.
- Fix: Error preg_replace(), add all other possible replacements for relative links.
- Replaced links like href="#aaa/bbb.xxx"
- Replaced links like href="aaa/bbb.xxx"
Similar to alexdebril#427

Use the new method "setLinkForAnalysis" instead of "setLink" (XmlParser.php)

Added analysis of relative links for the Atom feed (Link.php)

Author: IgorA100

src/FeedIo/Feed/Node.php

@@ -30,6 +30,8 @@ class Node implements NodeInterface, ElementsAwareInterface, ArrayableInterface
 
     protected ?string $host = null;
 
+    protected ?string $linkLinkForAnalysis = null;
+
     public function __construct()
     {
         $this->initElements();
@@ -135,10 +137,23 @@ public function getLink(): ?string
         return $this->link;
     }
 
+    public function getLinkForAnalysis(): ?string
+    {
+        return $this->linkForAnalysis;
+    }
+
     public function setLink(string $link = null): NodeInterface
     {
         $this->link = $link;
         $this->setHost($link);
+        $this->setLinkForAnalysis($link);
+
+        return $this;
+    }
+
+    public function setLinkForAnalysis(string $link = null): NodeInterface
+    {
+        $this->linkForAnalysis = $link;
 
         return $this;
     }
@@ -152,29 +167,43 @@ protected function setHost(string $link = null): void
 
     protected function setHostInContent(string $host = null): void
     {
-        if (property_exists($this, 'content')){
-            if (!is_null($host) && !is_null($this->content)) {
-                $this->content = preg_replace('!(<*\s*[^>]*)(href=)(.?)(\/[^\/])!','\1 href=\3'.$host.'\4', $this->content );
-                $this->content = preg_replace('!(<*\s*[^>]*)(src=)(.?)(\/[^\/])!','\1 src=\3'.$host.'\4', $this->content );
-            }
+        if (is_null($host)) {
+            return;
         }
-        if (property_exists($this, 'description')){
-            if (!is_null($host) && !is_null($this->description)) {
-                $this->description = preg_replace('!(<*\s*[^>]*)(href=)(.?)(\/[^\/])!','\1 href=\3'.$host.'\4', $this->description );
-                $this->description = preg_replace('!(<*\s*[^>]*)(src=)(.?)(\/[^\/])!','\1 src=\3'.$host.'\4', $this->description );
-            }
+        // Replaced links like href="/aaa/bbb.xxx"
+        $pattern = '(<\s*[^>]*)(href=|src=)(.?)(\/[^\/])(?!(.(?!<code))*<\/code>)';
+        $this->pregReplaceInProperty('content', $pattern, '\1\2\3'.$host.'\4');
+        $this->pregReplaceInProperty('description', $pattern, '\1\2\3'.$host.'\4');
+
+        $itemFullLink = $this->getLinkForAnalysis();
+        $itemLink = implode("/", array_slice(explode("/", $itemFullLink), 0, -1))."/";
+
+        // Replaced links like href="#aaa/bbb.xxx"
+        $pattern = '(<\s*[^>]*)(href=|src=)(.?)(#)(?!(.(?!<code))*<\/code>)';
+        $this->pregReplaceInProperty('content', $pattern, '\1\2\3'.$itemFullLink.'\4');
+        $this->pregReplaceInProperty('description', $pattern, '\1\2\3'.$itemFullLink.'\4');
+
+        // Replaced links like href="aaa/bbb.xxx"
+        $pattern = '(<\s*[^>]*)(href=|src=)(.?)(\w+\b)(?![:])(?!(.(?!<code))*<\/code>)';
+        $this->pregReplaceInProperty('content', $pattern, '\1\2\3'.$itemLink.'\4');
+        $this->pregReplaceInProperty('description', $pattern, '\1\2\3'.$itemLink.'\4');
+    }
+
+    public function pregReplaceInProperty(string $property, string $pattern, string $replacement): void
+    {
+        if (property_exists($this, $property) && !is_null($this->{$property})) {
+            $this->{$property} = preg_replace('~'.$pattern.'~', $replacement, $this->{$property}) ?? $this->{$property};
         }
     }
 
     public function getHostFromLink(): ?string
     {
-        if (!is_null($this->getLink())) {
-            $partsUrl  = parse_url($this->getLink());
-            $result = $partsUrl['scheme']."://".$partsUrl['host'];
-        } else
-            $result = null;
+        if (is_null($this->getLinkForAnalysis())) {
+            return null;
+        }
+        $partsUrl = parse_url($this->getLinkForAnalysis());
 
-        return $result;
+        return $partsUrl['scheme']."://".$partsUrl['host'];
     }
 
     public function getValue(string $name): ?string

src/FeedIo/Parser/XmlParser.php

@@ -77,7 +77,8 @@ protected function handleNode(NodeInterface $item, DOMElement $node, RuleSet $ru
     {
         if ($this->isItem($node->tagName) && $item instanceof FeedInterface) {
             $linkItem = $item->getLink();
-            $newItem = $this->parseNode($item->newItem()->setLink($linkItem), $node, $this->getItemRuleSet());
+            $newItem = $this->parseNode($item->newItem()->setLinkForAnalysis($linkItem), $node, $this->getItemRuleSet());
+
             $this->addValidItem($item, $newItem);
         } else {
             $rule = $ruleSet->get($node->tagName);

src/FeedIo/Rule/Atom/Link.php

@@ -28,7 +28,11 @@ protected function selectAlternateLink(NodeInterface $node, \DOMElement $element
         ($element->hasAttribute('rel') && $element->getAttribute('rel') == 'alternate')
         || is_null($node->getLink())
         ) {
-            $node->setLink($element->getAttribute('href'));
+            $href = $element->getAttribute('href');
+            if (parse_url($href, PHP_URL_HOST) == null) {
+                $href = $node->getHostFromLink(). $href;
+            }
+            $node->setLink($href);
         }
     }