implement error handler, return Error::Parse on source could not be processed

src/app/browser/window/tab/item/page/content/text/gemini/reader/syntax.rs

@@ -1,3 +1,6 @@
+pub mod error;
+pub use error::Error;
+
 use adw::StyleManager;
 use gtk::{
     gdk::RGBA,
@@ -9,7 +12,6 @@ use syntect::{
     easy::HighlightLines,
     highlighting::{Color, FontStyle, ThemeSet},
     parsing::{SyntaxReference, SyntaxSet},
-    Error,
 };
 
 /*  Default theme
@@ -46,38 +48,26 @@ impl Syntax {
     ) -> Result<Vec<(TextTag, String)>, Error> {
         if let Some(value) = alt {
             if let Some(reference) = self.syntax_set.find_syntax_by_name(value) {
-                return self.syntect_buffer(source_code, source_tag, reference);
+                return self.buffer(source_code, source_tag, reference);
             }
 
             if let Some(reference) = self.syntax_set.find_syntax_by_token(value) {
-                return self.syntect_buffer(source_code, source_tag, reference);
+                return self.buffer(source_code, source_tag, reference);
             }
 
             if let Some(reference) = self.syntax_set.find_syntax_by_path(value) {
-                return self.syntect_buffer(source_code, source_tag, reference);
+                return self.buffer(source_code, source_tag, reference);
             }
         }
 
         if let Some(reference) = self.syntax_set.find_syntax_by_first_line(source_code) {
-            return self.syntect_buffer(source_code, source_tag, reference);
+            return self.buffer(source_code, source_tag, reference);
         }
 
-        Ok(self.default_buffer(source_code, source_tag))
+        Err(Error::Parse)
     }
 
-    fn default_buffer(&self, source: &str, source_tag: &TextTag) -> Vec<(TextTag, String)> {
+    fn buffer(
-        // Init new line buffer
-        let mut buffer = Vec::new();
-
-        // Create new tag preset from source
-        let tag = new_text_tag_from(source_tag);
-
-        // Append
-        buffer.push((tag, source.to_string()));
-        buffer
-    }
-
-    fn syntect_buffer(
         &self,
         source: &str,
         source_tag: &TextTag,
@@ -87,18 +77,19 @@ impl Syntax {
         let mut buffer = Vec::new();
 
         // Apply syntect decorator
-        let ranges = HighlightLines::new(
+        let mut ranges = HighlightLines::new(
             syntax_reference,
             &self.theme_set.themes[if StyleManager::default().is_dark() {
                 DEFAULT_THEME_DARK
             } else {
                 DEFAULT_THEME_LIGHT
             }], // @TODO apply on env change
-        )
+        );
-        .highlight_line(source, &self.syntax_set)?;
 
+        match ranges.highlight_line(source, &self.syntax_set) {
+            Ok(result) => {
                 // Build tags
-        for (style, entity) in ranges {
+                for (style, entity) in result {
                     // Create new tag preset from source
                     let tag = new_text_tag_from(source_tag);
 
@@ -111,9 +102,11 @@ impl Syntax {
                     // Append
                     buffer.push((tag, entity.to_string()));
                 }
-
                 Ok(buffer)
             }
+            Err(e) => Err(Error::Syntect(e)),
+        }
+    }
 }
 
 // Tools

src/app/browser/window/tab/item/page/content/text/gemini/reader/syntax/error.rs

@@ -0,0 +1,18 @@
+use std::fmt::{Display, Formatter, Result};
+
+#[derive(Debug)]
+pub enum Error {
+    Parse,
+    Syntect(syntect::Error),
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        match self {
+            Self::Parse => write!(f, "Parse error"),
+            Self::Syntect(e) => {
+                write!(f, "Syntect error: {e}")
+            }
+        }
+    }
+}