Add Anchor element for references to items

Cargo.lock

@@ -358,7 +358,7 @@ dependencies = [
 
 [[package]]
 name = "snekdown"
-version = "0.3.1"
+version = "0.4.0"
 dependencies = [
  "chrono 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "snekdown"
-version = "0.3.1"
+version = "0.4.0"
 authors = ["trivernis <trivernis@protonmail.com>"]
 edition = "2018"
 license-file = "LICENSE"

src/format/html.rs

@@ -35,6 +35,7 @@ impl ToHtml for Inline {
         match self {
             Inline::Text(text) => text.to_html(),
             Inline::Ruler(ruler) => ruler.to_html(),
+            Inline::Anchor(anchor) => anchor.to_html(),
         }
     }
 }
@@ -119,7 +120,12 @@ impl ToHtml for Section {
 
 impl ToHtml for Header {
     fn to_html(&self) -> String {
-        format!("<h{0}>{1}</h{0}>", self.size, self.line.to_html())
+        format!(
+            "<h{0} id='{1}'>{2}</h{0}>",
+            self.size,
+            encode_attribute(self.anchor.as_str()),
+            self.line.to_html()
+        )
     }
 }
 
@@ -352,3 +358,13 @@ impl ToHtml for Placeholder {
         }
     }
 }
+
+impl ToHtml for Anchor {
+    fn to_html(&self) -> String {
+        format!(
+            "<a href='#{}'>{}</a>",
+            encode_attribute(self.reference.as_str()),
+            self.description.to_html()
+        )
+    }
+}

src/parsing/elements.rs

@@ -46,6 +46,7 @@ pub enum Block {
 pub enum Inline {
     Text(Text),
     Ruler(Ruler),
+    Anchor(Anchor),
 }
 
 #[derive(Clone, Debug)]
@@ -66,6 +67,7 @@ pub struct Section {
 pub struct Header {
     pub(crate) size: u8,
     pub(crate) line: Inline,
+    pub(crate) anchor: String,
 }
 
 #[derive(Clone, Debug)]
@@ -200,6 +202,12 @@ pub struct Placeholder {
     pub(crate) value: Option<Element>,
 }
 
+#[derive(Clone, Debug)]
+pub struct Anchor {
+    pub(crate) description: Box<Inline>,
+    pub(crate) reference: String,
+}
+
 // implementations
 
 impl Document {
@@ -246,7 +254,7 @@ impl Document {
         list.ordered = true;
         self.elements.iter().for_each(|e| match e {
             Block::Section(sec) => {
-                let mut item = ListItem::new(sec.header.line.clone(), 1, true);
+                let mut item = ListItem::new(Inline::Anchor(sec.header.get_anchor()), 1, true);
                 item.children.append(&mut sec.get_toc_list().items);
                 list.add_item(item);
             }
@@ -299,7 +307,7 @@ impl Section {
         let mut list = List::new();
         self.elements.iter().for_each(|e| {
             if let Block::Section(sec) = e {
-                let mut item = ListItem::new(sec.header.line.clone(), 1, true);
+                let mut item = ListItem::new(Inline::Anchor(sec.header.get_anchor()), 1, true);
                 item.children.append(&mut sec.get_toc_list().items);
                 list.add_item(item);
             }
@@ -309,6 +317,23 @@ impl Section {
     }
 }
 
+impl Header {
+    pub fn new(content: Inline, anchor: String) -> Self {
+        Self {
+            size: 0,
+            anchor,
+            line: content,
+        }
+    }
+
+    pub fn get_anchor(&self) -> Anchor {
+        Anchor {
+            description: Box::new(self.line.clone()),
+            reference: self.anchor.clone(),
+        }
+    }
+}
+
 impl Paragraph {
     pub fn new() -> Self {
         Self {

src/parsing/parser.rs

@@ -455,10 +455,14 @@ impl Parser {
 
     /// parses the header of a section
     fn parse_header(&mut self) -> Result<Header, ParseError> {
-        Ok(Header {
-            size: 0,
-            line: self.parse_inline()?,
-        })
+        let start_index = self.index;
+        let line = self.parse_inline()?;
+        let mut anchor = String::new();
+        self.text[start_index..self.index]
+            .iter()
+            .for_each(|e| anchor.push(*e));
+        anchor.retain(|c| !c.is_whitespace());
+        Ok(Header::new(line, anchor))
     }
 
     /// parses a code block