Merge pull request #1 from hipstermojo/readability

Add Readability port

Cargo.lock

@@ -704,9 +704,9 @@ dependencies = [
 
 [[package]]
 name = "kuchiki"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1beeffc5ae5ab0def2cb85e26063a8e6b4f579b0adec3805bf87472086948956"
+checksum = "1ea8e9c6e031377cff82ee3001dc8026cdf431ed4e2e6b51f98ab8c73484a358"
 dependencies = [
  "cssparser",
  "html5ever 0.25.1",
@@ -1010,12 +1010,15 @@ dependencies = [
 
 [[package]]
 name = "paperoni"
-version = "0.1.0"
+version = "0.1.0-alpha1"
 dependencies = [
  "async-std",
  "epub-builder",
+ "html5ever 0.25.1",
  "kuchiki",
+ "lazy_static 1.4.0",
  "md5",
+ "regex",
  "structopt",
  "surf",
  "url",
@@ -1392,9 +1395,9 @@ checksum = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
 
 [[package]]
 name = "regex"
-version = "1.3.7"
+version = "1.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6020f034922e3194c711b82a627453881bc4682166cabb07134a10c26ba7692"
+checksum = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1404,9 +1407,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.17"
+version = "0.6.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe5bd57d1d7414c6b5ed48563a2c855d995ff777729dcd91c369ec7fea395ae"
+checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
 
 [[package]]
 name = "remove_dir_all"

Cargo.toml

@@ -1,6 +1,9 @@
 [package]
+description = "A web article downloader"
+homepage = "https://github.com/hipstermojo/paperoni"
+repository = "https://github.com/hipstermojo/paperoni"
 name = "paperoni"
-version = "0.1.0"
+version = "0.1.0-alpha1"
 authors = ["Kenneth Gitere <gitere81@gmail.com>"]
 edition = "2018"
 license = "MIT"
@@ -10,8 +13,11 @@ license = "MIT"
 [dependencies]
 async-std = "1.5.0"
 epub-builder = "0.4.5"
-kuchiki = "0.8.0"
+html5ever = "0.25.1"
+kuchiki = "0.8.1"
+lazy_static = "1.3.9"
 md5 = "0.7.0"
+regex = "1.3.9"
 surf = "1.0.3"
 structopt = { version = "0.3" }
 url = "2.1.1"

README.md

@@ -0,0 +1,53 @@
+<p align="center"><img src="./paperoni-dark.png" width="400"></p>
+
+<p align="center"><i>Salami not included</i></p>
+
+Paperoni is a web article downloader written in Rust. The downloaded articles are then exported as EPUB files.
+
+> This project is in an alpha release so it is pretty unstable.
+
+## Usage
+
+```sh
+paperoni https://en.wikipedia.org/wiki/Pepperoni
+```
+
+Paperoni also supports passing multiple links as arguments. If you are on a Unix-like OS, you can simply do something like this:
+
+```sh
+cat links.txt | xargs paperoni
+```
+
+## How it works
+
+The URL passed to Paperoni is fetched and the returned HTML response is passed to the extractor.
+This extractor retrieves a possible article using a port of the [Mozilla Readability algorithm](https://github.com/mozilla/readability). This article is then saved in an EPUB.
+
+> The port of the algorithm is still unstable as well so it is not fully compatible with all the websites that can be extracted using Readability.
+
+## How it (currently) doesn't work
+
+This program is still in alpha so a number of things currently break:
+
+- Links with redirects will crash the program as it has no redirect logic.
+- Websites that only run with JavaScript cannot be extracted.
+- Website articles that cannot be extracted by Readability cannot be extracted by Paperoni either.
+
+## Running locally
+
+### Precompiled binaries
+
+Check the [releases](https://github.com/hipstermojo/paperoni/releases) page for precompiled binaries. Currently there are only builds for Debian and Arch.
+
+### Building from source
+
+This project uses `async/.await` so it should be compiled using a minimum Rust version of 1.33. Preferrably use the latest version of Rust.
+
+```sh
+git clone https://github.com/hipstermojo/paperoni.git
+cd paperoni
+## You can build and install paperoni locally
+cargo install --path .
+## or use it from within the project
+cargo run -- # pass your url here
+```

src/cli.rs

@@ -9,5 +9,5 @@ use structopt::StructOpt;
 pub struct Opts {
     // #[structopt(conflicts_with("links"))]
     /// Url of a web article
-    pub url: Option<String>,
+    pub urls: Vec<String>,
 }

src/extractor.rs

@@ -1,90 +1,53 @@
 use async_std::fs::File;
 use async_std::io::prelude::*;
 use async_std::task;
-use kuchiki::{traits::*, ElementData, NodeDataRef, NodeRef};
+use kuchiki::{traits::*, NodeRef};
 use url::Url;
 
+use crate::moz_readability::{MetaData, Readability};
+
 pub type ResourceInfo = (String, Option<String>);
 
 pub struct Extractor {
-    pub root_node: NodeRef,
+    article: Option<NodeRef>,
-    pub content: Option<NodeDataRef<ElementData>>,
     pub img_urls: Vec<ResourceInfo>,
+    readability: Readability,
 }
 
 impl Extractor {
     /// Create a new instance of an HTML extractor given an HTML string
     pub fn from_html(html_str: &str) -> Self {
         Extractor {
-            content: None,
+            article: None,
             img_urls: Vec::new(),
-            root_node: kuchiki::parse_html().one(html_str),
+            readability: Readability::new(html_str),
         }
     }
 
-    /// Extract the value of an attribute
-    fn extract_attr_val<T: Fn(&str) -> U, U>(
-        &self,
-        css_selector: &str,
-        attr_target: &str,
-        mapper: T,
-    ) -> Option<U> {
-        self.root_node
-            .select_first(css_selector)
-            .ok()
-            .and_then(|data| data.attributes.borrow().get(attr_target).map(mapper))
-    }
-
-    /// Extract the text of a DOM node given its CSS selector
-    fn extract_inner_text(&self, css_selector: &str) -> Option<String> {
-        let node_ref = self.root_node.select_first(css_selector).ok()?;
-        extract_text_from_node(node_ref.as_node())
-    }
-
     /// Locates and extracts the HTML in a document which is determined to be
     /// the source of the content
-    pub fn extract_content(&mut self) {
+    pub fn extract_content(&mut self, url: &str) {
-        // Extract the useful parts of the head section
+        self.readability.parse(url);
-        let author: Option<String> =
+        if let Some(article_node_ref) = &self.readability.article_node {
-            self.extract_attr_val("meta[name='author']", "content", |author| {
+            let template = r#"
-                author.to_string()
+            <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops">
-            });
+                <head>
-
+                </head>
-        let description =
+                <body>
-            self.extract_attr_val("meta[name='description']", "content", |description| {
+                </body>
-                description.to_string()
+            </html>
-            });
+            "#;
-
+            let doc = kuchiki::parse_html().one(template);
-        let tags = self.extract_attr_val("meta[name='keywords']", "content", |tags| {
+            let body = doc.select_first("body").unwrap();
-            tags.split(",")
+            body.as_node().append(article_node_ref.clone());
-                .map(|tag| tag.trim().to_string())
+            self.article = Some(doc);
-                .collect::<Vec<String>>()
-        });
-
-        let title = self.extract_inner_text("title").unwrap_or("".to_string());
-        let lang = self
-            .extract_attr_val("html", "lang", |lang| lang.to_string())
-            .unwrap_or("en".to_string());
-
-        let meta_attrs = MetaAttr::new(author, description, lang, tags, title);
-
-        // Extract the article
-
-        let article_ref = self.root_node.select_first("article").unwrap();
-
-        for node_ref in article_ref.as_node().descendants() {
-            match node_ref.data() {
-                kuchiki::NodeData::Element(..) | kuchiki::NodeData::Text(..) => (),
-                _ => node_ref.detach(),
         }
     }
-        self.content = Some(article_ref);
-    }
 
     /// Traverses the DOM tree of the content and retrieves the IMG URLs
     fn extract_img_urls(&mut self) {
-        if let Some(content_ref) = &self.content {
+        if let Some(content_ref) = &self.readability.article_node {
-            for img_ref in content_ref.as_node().select("img").unwrap() {
+            for img_ref in content_ref.select("img").unwrap() {
                 img_ref.as_node().as_element().map(|img_elem| {
                     img_elem.attributes.borrow().get("src").map(|img_url| {
                         if !img_url.is_empty() {
@@ -133,10 +96,10 @@ impl Extractor {
             let (img_url, img_path, img_mime) = async_task.await;
             // Update the image sources
             let img_ref = self
-                .content
+                .readability
+                .article_node
                 .as_mut()
                 .expect("Unable to get mutable ref")
-                .as_node()
                 .select_first(&format!("img[src='{}']", img_url))
                 .expect("Image node does not exist");
             let mut img_node = img_ref.attributes.borrow_mut();
@@ -145,11 +108,14 @@ impl Extractor {
         }
         Ok(())
     }
-}
 
-fn extract_text_from_node(node: &NodeRef) -> Option<String> {
+    pub fn article(&self) -> Option<&NodeRef> {
-    node.first_child()
+        self.article.as_ref()
-        .map(|child_ref| child_ref.text_contents())
+    }
+
+    pub fn metadata(&self) -> &MetaData {
+        &self.readability.metadata
+    }
 }
 
 /// Utility for hashing URLs. This is used to help store files locally with unique values
@@ -192,33 +158,6 @@ fn get_absolute_url(url: &str, request_url: &Url) -> String {
     }
 }
 
-#[derive(Debug)]
-pub struct MetaAttr {
-    author: Option<String>,
-    description: Option<String>,
-    language: String,
-    tags: Option<Vec<String>>,
-    title: String,
-}
-
-impl MetaAttr {
-    pub fn new(
-        author: Option<String>,
-        description: Option<String>,
-        language: String,
-        tags: Option<Vec<String>>,
-        title: String,
-    ) -> Self {
-        MetaAttr {
-            author,
-            description,
-            language,
-            tags,
-            title,
-        }
-    }
-}
-
 #[cfg(test)]
 mod test {
     use super::*;
@@ -250,86 +189,17 @@ mod test {
         </html>
         "#;
 
-    #[test]
-    fn test_extract_attr_val() {
-        let extractor = Extractor::from_html(TEST_HTML);
-        let ext_author =
-            extractor.extract_attr_val("meta[name='author']", "content", |val| val.to_string());
-        assert!(ext_author.is_some());
-        assert_eq!("Paperoni", &ext_author.unwrap());
-        let ext_author =
-            extractor.extract_attr_val("meta[name='invalid-name']", "content", |val| {
-                val.to_string()
-            });
-        assert!(ext_author.is_none());
-        let lang_attr = extractor.extract_attr_val("html", "lang", |lang| lang.to_string());
-        assert!(lang_attr.is_some());
-        assert_eq!("en".to_string(), lang_attr.unwrap());
-    }
-
-    #[test]
-    fn test_extract_inner_text() {
-        let extractor = Extractor::from_html(TEST_HTML);
-        let title_text = extractor.extract_inner_text("title");
-        assert!(title_text.is_some());
-        assert_eq!("Testing Paperoni".to_string(), title_text.unwrap());
-
-        let title_text = extractor.extract_inner_text("titln");
-        assert!(title_text.is_none());
-    }
-    #[test]
-    fn test_extract_text() {
-        let extractor = Extractor::from_html(TEST_HTML);
-        let h1_node = extractor.root_node.select_first("h1").unwrap();
-        let h1_text = extract_text_from_node(h1_node.as_node());
-        assert!(h1_text.is_some());
-        assert_eq!("Testing Paperoni".to_string(), h1_text.unwrap());
-    }
-
-    #[test]
-    fn test_extract_content() {
-        let extracted_html: String = r#"
-            <article>
-                <h1>Starting out</h1>
-                <p>Some Lorem Ipsum text here</p>
-                <p>Observe this picture</p>
-                <img alt="Random image" src="./img.jpg">
-            </article>
-        "#
-        .lines()
-        .map(|line| line.trim())
-        .collect();
-
-        let mut extractor = Extractor::from_html(
-            &TEST_HTML
-                .lines()
-                .map(|line| line.trim())
-                .collect::<String>(),
-        );
-
-        extractor.extract_content();
-        let mut output = Vec::new();
-        assert!(extractor.content.is_some());
-
-        extractor
-            .content
-            .unwrap()
-            .as_node()
-            .serialize(&mut output)
-            .expect("Unable to serialize output HTML");
-        let output = std::str::from_utf8(&output).unwrap();
-
-        assert_eq!(extracted_html, output);
-    }
-
     #[test]
     fn test_extract_img_urls() {
         let mut extractor = Extractor::from_html(TEST_HTML);
-        extractor.extract_content();
+        extractor.extract_content("http://example.com/");
         extractor.extract_img_urls();
 
         assert!(extractor.img_urls.len() > 0);
-        assert_eq!(vec![("./img.jpg".to_string(), None)], extractor.img_urls);
+        assert_eq!(
+            vec![("http://example.com/img.jpg".to_string(), None)],
+            extractor.img_urls
+        );
     }
 
     #[test]
@@ -354,24 +224,4 @@ mod test {
             exts
         );
     }
-
-    #[test]
-    fn test_get_absolute_url() {
-        let absolute_url = "https://example.image.com/images/1.jpg";
-        let relative_url = "../../images/2.jpg";
-        let relative_from_host_url = "/images/3.jpg";
-        let host_url = Url::parse("https://example.image.com/blog/how-to-test-resolvers/").unwrap();
-        let abs_url = get_absolute_url(&absolute_url, &host_url);
-        assert_eq!("https://example.image.com/images/1.jpg", abs_url);
-        let abs_url = get_absolute_url(&relative_url, &host_url);
-        assert_eq!("https://example.image.com/images/2.jpg", abs_url);
-        let relative_url = "2-1.jpg";
-        let abs_url = get_absolute_url(&relative_url, &host_url);
-        assert_eq!(
-            "https://example.image.com/blog/how-to-test-resolvers/2-1.jpg",
-            abs_url
-        );
-        let abs_url = get_absolute_url(&relative_from_host_url, &host_url);
-        assert_eq!("https://example.image.com/images/3.jpg", abs_url);
-    }
 }

src/main.rs

@@ -1,3 +1,6 @@
+#[macro_use]
+extern crate lazy_static;
+
 use std::fs::File;
 
 use async_std::{fs::create_dir, fs::remove_dir_all, task};
@@ -7,33 +10,45 @@ use url::Url;
 
 mod cli;
 mod extractor;
+mod moz_readability;
 
 use extractor::Extractor;
 fn main() {
     let opt = cli::Opts::from_args();
-    if let Some(url) = opt.url {
+    if !opt.urls.is_empty() {
         println!("Downloading single article");
-        download(url)
+        download(opt.urls);
     }
 }
 
-async fn fetch_url(url: &str) -> String {
+type HTMLResource = (String, String);
+
+async fn fetch_url(url: &str) -> HTMLResource {
     let client = surf::Client::new();
     println!("Fetching...");
     // TODO: Add middleware for following redirects
+    (
+        url.to_string(),
         client
             .get(url)
             .recv_string()
             .await
-        .expect("Unable to fetch URL")
+            .expect("Unable to fetch URL"),
+    )
 }
 
-fn download(url: String) {
+fn download(urls: Vec<String>) {
+    let mut async_url_tasks = Vec::with_capacity(urls.len());
+    for url in urls {
+        async_url_tasks.push(task::spawn(async move { fetch_url(&url).await }));
+    }
     task::block_on(async {
-        let html = fetch_url(&url).await;
+        for url_task in async_url_tasks {
-        let mut extractor = Extractor::from_html(&html);
+            let (url, html) = url_task.await;
             println!("Extracting");
-        extractor.extract_content();
+            let mut extractor = Extractor::from_html(&html);
+            extractor.extract_content(&url);
+            if extractor.article().is_some() {
                 create_dir("res/")
                     .await
                     .expect("Unable to create res/ output folder");
@@ -41,16 +56,23 @@ fn download(url: String) {
                     .download_images(&Url::parse(&url).unwrap())
                     .await
                     .expect("Unable to download images");
-        let mut out_file = File::create("out.epub").unwrap();
+                let mut out_file =
+                    File::create(format!("{}.epub", extractor.metadata().title())).unwrap();
                 let mut html_buf = Vec::new();
                 extractor
-            .content
+                    .article()
                     .unwrap()
-            .as_node()
                     .serialize(&mut html_buf)
                     .expect("Unable to serialize");
                 let html_buf = std::str::from_utf8(&html_buf).unwrap();
+                let html_buf = moz_readability::regexes::REPLACE_SELF_CLOSING_REGEX
+                    .replace_all(html_buf, "$tag/>");
                 let mut epub = EpubBuilder::new(ZipLibrary::new().unwrap()).unwrap();
+                if let Some(author) = extractor.metadata().byline() {
+                    epub.metadata("author", author).unwrap();
+                }
+                epub.metadata("title", extractor.metadata().title())
+                    .unwrap();
                 epub.add_content(EpubContent::new("code.xhtml", html_buf.as_bytes()))
                     .unwrap();
                 for img in extractor.img_urls {
@@ -62,5 +84,7 @@ fn download(url: String) {
                 epub.generate(&mut out_file).unwrap();
                 println!("Cleaning up");
                 remove_dir_all("res/").await.unwrap();
+            }
+        }
     })
 }

src/moz_readability/regexes.rs

@@ -0,0 +1,139 @@
+/// This module contains regular expressions frequently used by moz_readability
+/// All regexes that only test if a `&str` matches the regex are preceded by the
+/// word "is_match". All other regexes are publicly accessible.
+use regex::Regex;
+pub fn is_match_byline(match_str: &str) -> bool {
+    lazy_static! {
+        static ref BYLINE_REGEX: Regex =
+            Regex::new(r"(?i)byline|author|dateline|writtenby|p-author").unwrap();
+    }
+    BYLINE_REGEX.is_match(match_str)
+}
+
+pub fn is_match_positive(match_str: &str) -> bool {
+    lazy_static! {
+        static ref POSITIVE_REGEX: Regex = Regex::new(r"(?i)article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story").unwrap();
+    }
+    POSITIVE_REGEX.is_match(match_str)
+}
+
+pub fn is_match_negative(match_str: &str) -> bool {
+    lazy_static! {
+        static ref NEGATIVE_REGEX: Regex = Regex::new(r"(?i)hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget").unwrap();
+    }
+    NEGATIVE_REGEX.is_match(match_str)
+}
+
+pub fn is_match_videos(match_str: &str) -> bool {
+    lazy_static! {
+        static ref VIDEOS_REGEX: Regex = Regex::new(r"(?i)//(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)").unwrap();
+    }
+    VIDEOS_REGEX.is_match(match_str)
+}
+
+pub fn is_match_unlikely(match_str: &str) -> bool {
+    lazy_static! {
+        static ref UNLIKELY_REGEX: Regex = Regex::new(r"(?i)-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote").unwrap();
+    }
+    UNLIKELY_REGEX.is_match(match_str)
+}
+
+pub fn is_match_ok_maybe(match_str: &str) -> bool {
+    lazy_static! {
+        static ref OK_MAYBE_REGEX: Regex =
+            Regex::new(r"(?i)and|article|body|column|content|main|shadow").unwrap();
+    }
+    OK_MAYBE_REGEX.is_match(match_str)
+}
+
+pub fn is_match_node_content(match_str: &str) -> bool {
+    lazy_static! {
+        static ref NODE_CONTENT_REGEX: Regex = Regex::new(r"\.( |$)").unwrap();
+    }
+    NODE_CONTENT_REGEX.is_match(match_str)
+}
+
+pub fn is_match_share_elems(match_str: &str) -> bool {
+    lazy_static! {
+        static ref SHARE_ELEMS_REGEX: Regex =
+            Regex::new(r"(?i)(\b|_)(share|sharedaddy)(\b|_)").unwrap();
+    }
+    SHARE_ELEMS_REGEX.is_match(match_str)
+}
+
+pub fn is_match_has_content(match_str: &str) -> bool {
+    lazy_static! {
+        static ref HAS_CONTENT_REGEX: Regex = Regex::new(r"\S$").unwrap();
+    }
+    HAS_CONTENT_REGEX.is_match(match_str)
+}
+
+pub fn is_match_img_ext(match_str: &str) -> bool {
+    lazy_static! {
+        static ref IMG_EXT_REGEX: Regex = Regex::new(r"(?i)\.(jpg|jpeg|png|webp)").unwrap();
+    }
+    IMG_EXT_REGEX.is_match(match_str)
+}
+
+pub fn is_match_srcset(match_str: &str) -> bool {
+    lazy_static! {
+        static ref SRCSET_REGEX: Regex = Regex::new(r"\.(jpg|jpeg|png|webp)\s+\d").unwrap();
+    }
+    SRCSET_REGEX.is_match(match_str)
+}
+
+pub fn is_match_src_regex(match_str: &str) -> bool {
+    lazy_static! {
+        static ref SRC_REGEX: Regex = Regex::new(r"^\s*\S+\.(jpg|jpeg|png|webp)\S*\s*$").unwrap();
+    }
+    SRC_REGEX.is_match(match_str)
+}
+
+pub fn is_match_name_pattern(match_str: &str) -> bool {
+    lazy_static! {
+        static ref NAME_PATTERN_REGEX: Regex = Regex::new(r"(?i)\s*(?:(dc|dcterm|og|twitter|weibo:(article|webpage))\s*[\.:]\s*)?(author|creator|description|title|site_name)\s*$").unwrap();
+    }
+    NAME_PATTERN_REGEX.is_match(match_str)
+}
+
+pub fn is_match_title_separator(match_str: &str) -> bool {
+    lazy_static! {
+        static ref TITLE_SEPARATOR_REGEX: Regex = Regex::new(r" [\|\-\\/>»] ").unwrap();
+    }
+    TITLE_SEPARATOR_REGEX.is_match(match_str)
+}
+
+pub fn is_match_has_title_separator(match_str: &str) -> bool {
+    lazy_static! {
+        static ref HAS_TITLE_SEPARATOR_REGEX: Regex = Regex::new(r" [\\/>»] ").unwrap();
+    }
+    HAS_TITLE_SEPARATOR_REGEX.is_match(match_str)
+}
+
+lazy_static! {
+    pub static ref NORMALIZE_REGEX: Regex = Regex::new(r"\s{2,}").unwrap();
+    pub static ref B64_DATA_URL_REGEX: Regex =
+        Regex::new(r"(?i)^data:\s*([^\s;,]+)\s*;\s*base64\s*").unwrap();
+    pub static ref BASE64_REGEX: Regex = Regex::new(r"(?i)base64\s*").unwrap();
+    pub static ref PROPERTY_REGEX: Regex = Regex::new(
+        r"(?i)\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|site_name)\s*"
+    )
+    .unwrap();
+    pub static ref SRCSET_CAPTURE_REGEX: Regex =
+        Regex::new(r"(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))").unwrap();
+    pub static ref REPLACE_WHITESPACE_REGEX: Regex = Regex::new(r"\s").unwrap();
+    pub static ref REPLACE_DOT_REGEX: Regex = Regex::new(r"\.").unwrap();
+    pub static ref REPLACE_HTML_ESCAPE_REGEX: Regex =
+        Regex::new("&(quot|amp|apos|lt|gt);").unwrap();
+    pub static ref REPLACE_HEX_REGEX: Regex =
+        Regex::new(r"(?i)&#(?:x([0-9a-z]{1,4})|([0-9]{1,4}));").unwrap();
+    pub static ref REPLACE_START_SEPARATOR_REGEX: Regex =
+        Regex::new(r"(?i)(?P<start>.*)[\|\-\\/>»] .*").unwrap();
+    pub static ref REPLACE_END_SEPARATOR_REGEX: Regex =
+        Regex::new(r"(?i)[^\|\-\\/>»]*[\|\-\\/>»](?P<end>.*)").unwrap();
+    pub static ref REPLACE_MULTI_SEPARATOR_REGEX: Regex = Regex::new(r"[\|\-\\/>»]+").unwrap();
+    pub static ref REPLACE_SELF_CLOSING_REGEX: Regex = Regex::new(
+        r#"(?P<tag><(?:area|base|br|col|embed|hr|img|input|link|meta|param|source|track|wbr)(?: [a-z\-]+=["'][\sa-zA-Z0-9\./\-_#]+["']|[a-z\-]+)*)>"#
+    )
+    .unwrap();
+}

test_html/simple.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <title>Sample Document</title>
+</head>
+
+<body>
+    <h1>Some text in h1</h1>
+    <img src="inexistent.png">
+    <div class="invalid-elems">
+        <!-- This div contains invalid elements -->
+        <h1>Imagine some lorem ipsum</h1>
+        <img>
+    </div>
+    <!-- Test that the no-script content is copied over -->
+    <img src="lazy-load.png">
+    <noscript>
+        <div class="parent">
+            <img src="eager-load.png" id="lazy-load">
+        </div>
+    </noscript>
+</body>
+
+</html>