Add a ScriptExtension::len method

crlf0710 · crlf0710 · commit 716c18e45583 · 2020-06-10T21:29:35.000+08:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -193,6 +193,15 @@ impl ScriptExtension {
         (self.first == 0) & (self.second == 0) & (self.third == 0)
     }
 
+    /// Returns the number of scripts in the script extension
+    pub fn len(self) -> usize {
+        if self.is_common_or_inherited() {
+            1
+        } else {
+            (self.first.count_ones() + self.second.count_ones() + self.third.count_ones()) as usize
+        }
+    }
+
     /// Intersect this `ScriptExtension` with another `ScriptExtension`. Produces `Unknown` if things
     /// do not intersect. This is equivalent to [`ScriptExtension::intersection`] but it stores the result
     /// in `self`
