Add support for lean, and fixed single comment regression (#70)

* Add Lean

* Handle single-line comments inside multi-line ones.

README.md

@@ -204,6 +204,7 @@ Julia
 JSON
 JSX
 Kotlin
+Lean
 LESS
 LD Script
 LISP

src/lib/language/language_type.rs

@@ -97,6 +97,8 @@ pub enum LanguageType {
     Jsx,
     /// Kotlin
     Kotlin,
+    /// Lean
+    Lean,
     /// Less
     Less,
     /// LinkerScript
@@ -236,6 +238,7 @@ impl LanguageType {
             Jsx => "JSX",
             Julia => "Julia",
             Kotlin => "Kotlin",
+            Lean => "Lean",
             Less => "LESS",
             LinkerScript => "LD Script",
             Lisp => "LISP",
@@ -335,6 +338,7 @@ impl LanguageType {
                 "jsx" => Some(Jsx),
                 "kt" | "kts" => Some(Kotlin),
                 "lds" => Some(LinkerScript),
+                "lean" | "hlean" => Some(Lean),
                 "less" => Some(Less),
                 "lua" => Some(Lua),
                 "m" => Some(ObjectiveC),
@@ -439,6 +443,7 @@ impl<'a> From<&'a str> for LanguageType {
             "Json" => Json,
             "Jsx" => Jsx,
             "Kotlin" => Kotlin,
+            "Lean" => Lean,
             "Less" => Less,
             "LinkerScript" => LinkerScript,
             "Lisp" => Lisp,

src/lib/language/languages.rs

@@ -321,6 +321,7 @@ impl Languages {
                 .set_quotes(vec![("\"", "\""), ("\"\"\"", "\"\"\"")]),
             Kotlin => Language::new_c().nested()
                 .set_quotes(vec![("\"", "\""), ("\"\"\"", "\"\"\"")]),
+            Lean => Language::new(vec!["--"], vec![("/-", "-/")]).nested(),
             Less => Language::new_c(),
             LinkerScript => Language::new_c(),
             Lisp => Language::new(vec![";"], vec![("#|", "|#")]).nested(),

src/lib/utils/multi_line.rs

@@ -66,9 +66,11 @@ pub fn handle_multi_line(line: &str,
         }
 
 
-        for comment in &language.line_comment {
-            if window.starts_with(comment) {
-                break 'window;
+        if stack.is_empty() {
+            for comment in &language.line_comment {
+                if window.starts_with(comment) {
+                    break 'window;
+                }
             }
         }
 
@@ -117,6 +119,15 @@ mod tests {
         assert_eq!(stack.len(), 0);
     }
 
+    #[test]
+    fn single_comment_in_multi() {
+        let mut stack = vec![];
+        let mut quote = None;
+        let language = Language::new_c();
+        handle_multi_line("Hello /* // */ world", &language, &mut stack, &mut quote);
+        assert_eq!(stack.len(), 0);
+    }
+
     #[test]
     fn comment_start() {
         let mut stack = vec![];