some incomplete changes

src/vcd/parse.rs

@@ -14,12 +14,43 @@ use types::*;
 mod metadata;
 use metadata::*;
 
+// use function_name::named;
+
+#[named]
+fn parse_signal_tree<'a>(
+    word_reader : &mut WordReader,
+    vcd         : &'a mut VCD
+) -> Result<&'a mut VCD, String> {
+    let err : Result<&'a mut VCD, String> = Err(format!("reached end of file without parser leaving {}", function_name!()));
+    // we assume we've already seen a `$scope` once
+    // by the time we reach this function
+    // let scope_name = 
+    loop {
+        let word = word_reader.next_word();
+
+        // if there isn't another word left in the file, then we exit
+        if word.is_none() {
+            return err;
+        }
+    }
+    Ok(vcd)
+}
+
 
 pub fn parse_vcd(file : File) {
     let mut word_gen = WordReader::new(file);
 
     let header = parse_metadata(&mut word_gen).unwrap();
-    dbg!(header);
+    dbg!(&header);
+
+    // let (word, cursor) = word_gen.next_word().unwrap();
+    // cursor.error(word).unwrap();
+
+    let mut vcd = VCD{
+        metadata: header,
+        all_signals: vec![],
+        all_scopes: vec![]
+    };
 }
 
 #[cfg(test)]