From 4d9cf7171836625b61dcfe675bdf9452766166c0 Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Thu, 17 Aug 2023 15:21:32 +0200
Subject: feat!: add offset to comments

---
 src/emitter.rs | 27 +++++++++++++++++++++++----
 src/lib.rs     |  2 +-
 2 files changed, 24 insertions(+), 5 deletions(-)

(limited to 'src')

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.
diff --git a/src/lib.rs b/src/lib.rs
index fd0349c..1105141 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -15,6 +15,6 @@ mod utils;
 #[cfg(feature = "integration-tests")]
 pub use utils::State as InternalState;
 
-pub use emitter::{Attribute, DefaultEmitter, Doctype, Emitter, EndTag, StartTag, Token};
+pub use emitter::{Attribute, Comment, DefaultEmitter, Doctype, Emitter, EndTag, StartTag, Token};
 pub use error::Error;
 pub use tokenizer::{State, Tokenizer};
-- 
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