feat!: add offset to comments

1 files changed, 23 insertions, 4 deletions

diff --git a/src/emitter.rs b/src/emitter.rs
index b3fdb99..caf7b55 100644
--- a/src/emitter.rs
+++ b/src/emitter.rs
@@ -270,8 +270,11 @@ impl<O: Offset, R: Position<O>> Emitter<R> for DefaultEmitter<R, O> {
         self.seen_attributes.clear();
     }
 
-    fn init_comment(&mut self, _reader: &R) {
-        self.current_token = Some(Token::Comment(String::new()));
+    fn init_comment(&mut self, reader: &R) {
+        self.current_token = Some(Token::Comment(Comment {
+            data: String::new(),
+            data_offset: reader.position(),
+        }));
     }
     fn emit_current_tag(&mut self) {
         self.flush_current_attribute();
@@ -348,7 +351,7 @@ impl<O: Offset, R: Position<O>> Emitter<R> for DefaultEmitter<R, O> {
 
     fn push_comment(&mut self, s: &str) {
         match self.current_token {
-            Some(Token::Comment(ref mut data)) => data.push_str(s),
+            Some(Token::Comment(Comment { ref mut data, .. })) => data.push_str(s),
             _ => debug_assert!(false),
         }
     }
@@ -483,6 +486,22 @@ pub struct EndTag<O> {
     pub name_span: Range<O>,
 }
 
+/// An HTML comment.
+#[derive(PartialEq, Eq, Debug)]
+pub struct Comment<O> {
+    /// The text within the comment.
+    pub data: String,
+    /// The source offset of the comment data.
+    pub data_offset: O,
+}
+
+impl<O: Offset> Comment<O> {
+    /// Calculates the span for the comment data and returns it.
+    pub fn data_span(&self) -> Range<O> {
+        self.data_offset..self.data_offset + self.data.len()
+    }
+}
+
 /// A doctype. Some examples:
 ///
 /// * `<!DOCTYPE {name}>`
@@ -515,7 +534,7 @@ pub enum Token<O> {
     /// A literal string.
     String(String),
     /// A HTML comment.
-    Comment(String),
+    Comment(Comment<O>),
     /// A HTML doctype declaration.
     Doctype(Doctype),
     /// A HTML parsing error.