remove empty nodes

article_scraper/src/constants.rs

@@ -137,6 +137,12 @@ pub static DIV_TO_P_ELEMS: Lazy<HashSet<&str>> = Lazy::new(|| {
     ])
 });
 
+pub static VALID_EMPTY_TAGS: Lazy<HashSet<&str>> = Lazy::new(|| {
+    HashSet::from([
+        "AREA", "BASE", "BR", "COL", "EMBED", "HR", "IMG", "LINK", "META", "SOURCE", "TRACK",
+    ])
+});
+
 pub static ALTER_TO_DIV_EXCEPTIONS: Lazy<HashSet<&str>> =
     Lazy::new(|| HashSet::from(["DIV", "ARTICLE", "SECTION", "P"]));
 

article_scraper/src/full_text_parser/mod.rs

@@ -1113,6 +1113,7 @@ impl FullTextParser {
         Self::clean_attributes(node)?;
         Self::remove_single_cell_tables(node);
         Self::remove_extra_p_and_div(node);
+        Self::remove_empty_nodes(node);
 
         Ok(())
     }
@@ -1243,10 +1244,17 @@ impl FullTextParser {
 
         while let Some(mut node) = node_iter {
             let tag_name = node.get_name().to_uppercase();
-            if tag_name != "ARTICLE"
-                && node.get_parent().is_some()
-                && (tag_name == "DIV" || tag_name == "SECTION")
-            {
+
+            if tag_name == "ARTICLE" || node.get_parent().is_none() {
+                node_iter = Util::next_node(&node, false);
+                continue;
+            }
+
+            if tag_name != "DIV" && tag_name != "SECTION" {
+                node_iter = Util::next_node(&node, false);
+                continue;
+            }
+
             if Util::is_element_without_content(&node) {
                 node_iter = Util::remove_and_next(&mut node);
                 continue;
@@ -1273,10 +1281,29 @@ impl FullTextParser {
                     }
                 }
             }
-            }
 
             node_iter = Util::next_node(&node, false);
         }
         Ok(())
     }
+
+    fn remove_empty_nodes(root: &mut Node) {
+        let mut node_iter = Some(root.clone());
+
+        while let Some(mut node) = node_iter {
+            let tag_name = node.get_name().to_uppercase();
+
+            if constants::VALID_EMPTY_TAGS.contains(tag_name.as_str()) {
+                node_iter = Util::next_node(&node, false);
+                continue;
+            }
+
+            if Util::is_element_without_children(&node) {
+                node_iter = Util::remove_and_next(&mut node);
+                continue;
+            }
+
+            node_iter = Util::next_node(&node, false);
+        }
+    }
 }

article_scraper/src/full_text_parser/readability/tests.rs

@@ -45,6 +45,8 @@ async fn run_test(name: &str) {
     article.root_node = Some(root);
     let html = article.get_content().unwrap();
 
+    //std::fs::write(format!("./resources/tests/readability/{name}/expected.html"), &html).unwrap();
+
     let expected = std::fs::read_to_string(format!(
         "./resources/tests/readability/{name}/expected.html"
     ))

article_scraper/src/full_text_parser/tests.rs

@@ -68,6 +68,17 @@ async fn youtube() {
         .unwrap_or(false));
 }
 
+#[tokio::test]
+async fn hardwareluxx() {
+    let _ = env_logger::builder().is_test(true).try_init();
+    let out_path = PathBuf::from(r"./test_output");
+    let url = url::Url::parse("https://www.hardwareluxx.de/index.php/news/software/spiele/60882-half-life-mit-ray-tracing-mod-gibt-dem-25-jahr-alten-shooter-neuen-glanz.html").unwrap();
+
+    let grabber = FullTextParser::new(None).await;
+    let article = grabber.parse(&url, &Client::new()).await.unwrap();
+    article.save_html(&out_path).unwrap();
+}
+
 #[tokio::test]
 async fn encoding_windows_1252() {
     let _ = env_logger::builder().is_test(true).try_init();

article_scraper/src/util.rs

@@ -439,6 +439,33 @@ impl Util {
         }
     }
 
+    pub fn is_element_without_children(node: &Node) -> bool {
+        if let Some(node_type) = node.get_type() {
+            let len = node.get_child_nodes().len();
+            node_type == NodeType::ElementNode
+                && (len == 0 || node.get_content().trim().is_empty())
+                && Self::get_elements_by_tag_names(node, &constants::VALID_EMPTY_TAGS).is_empty()
+        } else {
+            false
+        }
+    }
+
+    pub fn get_elements_by_tag_names(node: &Node, tags: &HashSet<&str>) -> Vec<Node> {
+        let mut vec = Vec::new();
+
+        fn get_elems(node: &Node, tags: &HashSet<&str>, vec: &mut Vec<Node>) {
+            for child in node.get_child_elements() {
+                if tags.contains(child.get_name().to_uppercase().as_str()) {
+                    vec.push(child.clone());
+                }
+                get_elems(&child, tags, vec);
+            }
+        }
+
+        get_elems(node, tags, &mut vec);
+        vec
+    }
+
     pub fn get_elements_by_tag_name(node: &Node, tag: &str) -> Vec<Node> {
         let tag = tag.to_uppercase();
         let all_tags = tag == "*";
@@ -629,17 +656,17 @@ impl Util {
             let link_density = Self::get_link_density(node);
             let content = Self::get_inner_text(node, true);
             let content_length = content.len();
+            let has_figure_ancestor =
+                Self::has_ancestor_tag(node, "figure", None, None::<fn(&Node) -> bool>);
 
-            let have_to_remove = (img > 1
-                && (p as f64 / img as f64) < 0.5
-                && !Self::has_ancestor_tag(node, "figure", None, None::<fn(&Node) -> bool>))
+            let have_to_remove = (img > 1 && (p as f64 / img as f64) < 0.5 && !has_figure_ancestor)
                 || (!is_list && li > p as i64)
                 || (input as f64 > f64::floor(p as f64 / 3.0))
                 || (!is_list
                     && heading_density < 0.9
                     && content_length < 25
                     && (img == 0 || img > 2)
-                    && !Self::has_ancestor_tag(node, "figure", None, None::<fn(&Node) -> bool>))
+                    && !has_figure_ancestor)
                 || (!is_list && weight < 25 && link_density > 0.2)
                 || (weight >= 25 && link_density > 0.5)
                 || ((embed_count == 1 && content_length < 75) || embed_count > 1);