Add HTML export format

1 files changed, 14 insertions, 0 deletions

diff --git a/crates/typst-library/src/engine.rs b/crates/typst-library/src/engine.rs
index e532172e..cd25ec48 100644
--- a/crates/typst-library/src/engine.rs
+++ b/crates/typst-library/src/engine.rs
@@ -301,6 +301,9 @@ impl Route<'_> {
     /// The maximum layout nesting depth.
     const MAX_LAYOUT_DEPTH: usize = 72;
 
+    /// The maximum HTML nesting depth.
+    const MAX_HTML_DEPTH: usize = 72;
+
     /// The maximum function call nesting depth.
     const MAX_CALL_DEPTH: usize = 80;
 
@@ -326,6 +329,17 @@ impl Route<'_> {
         Ok(())
     }
 
+    /// Ensures that we are within the maximum HTML depth.
+    pub fn check_html_depth(&self) -> HintedStrResult<()> {
+        if !self.within(Route::MAX_HTML_DEPTH) {
+            bail!(
+                "maximum HTML depth exceeded";
+                hint: "try to reduce the amount of nesting of your HTML",
+            );
+        }
+        Ok(())
+    }
+
     /// Ensures that we are within the maximum function call depth.
     pub fn check_call_depth(&self) -> StrResult<()> {
         if !self.within(Route::MAX_CALL_DEPTH) {