Add variants for future support of parts in Number

src/lib/html.rs

@@ -110,6 +110,7 @@ impl<'a> HtmlRenderer<'a> {
                 self.current_numbering = 0;
                 self.current_hide = true;
             },
+            _ => panic!("Parts are not supported yet"),
         }
         self.filename = filename;
     }

src/lib/number.rs

@@ -8,11 +8,25 @@ pub enum Number {
     /// Chapter follows books numbering, number is given automatically
     Default,
     /// Chapter number set to specified number
-    Specified(i32), 
+    Specified(i32),
+    /// Chapter is actually an unnumbered part
+    UnnumberedPart,
+    /// Chapter is actually a part following book numbering
+    DefaultPart,
+    /// Chapter is actually a part whose number is specified
+    SpecifiedPart(i32)
 }
 
 
 impl Number {
+    /// Returns true if self is a part
+    pub fn is_part(&self) -> bool {
+        match *self {
+            Number::UnnumberedPart | Number::DefaultPart | Number::SpecifiedPart(..) => true,
+            _ => false
+        }
+    }
+    
     /// Returns true if self is hidden
     pub fn is_hidden(&self) -> bool {
         *self == Number::Hidden
@@ -21,7 +35,7 @@ impl Number {
     /// Returns true if self is numbered
     pub fn is_numbered(&self) -> bool {
         match *self {
-            Number::Hidden | Number::Unnumbered => false,
+            Number::Hidden | Number::Unnumbered | Number::UnnumberedPart => false,
             _ => true,
         }
     }

src/lib/odt.rs

@@ -82,6 +82,7 @@ impl<'a> OdtRenderer<'a> {
                     self.current_numbering = 0;
                     self.current_hide = true;
                 },
+                _ => panic!("Parts are not supported yet")
             }
             for token in v {
                 content.push_str(&self.parse_token(token));