Support for underscores

schala-lang/src/ast.rs

@@ -132,6 +132,7 @@ pub struct Guard {
 
 #[derive(Debug, PartialEq, Clone)]
 pub enum Pattern {
+  Ignored,
   TuplePattern(Vec<Pattern>),
   Literal(PatternLiteral),
   TupleStruct(Rc<String>, Vec<Pattern>),

schala-lang/src/lib.rs

@@ -79,7 +79,6 @@ fn parsing(_handle: &mut Schala, input: Vec<tokenizing::Token>, comp: Option<&mu
 
   let (ast, trace) = parsing::parse(input);
   comp.map(|comp| {
-    println!("DEBUG OPTS: {:?}", comp.cur_debug_options);
     //TODO need to control which of these debug stages get added
     let opt = comp.cur_debug_options.get(0).map(|s| s.clone());
     match opt {

schala-lang/src/parsing.rs

@@ -694,21 +694,6 @@ impl Parser {
   });
 
   parse_method!(simple_pattern(&mut self) -> ParseResult<Pattern> {
-    /*
-    let name = self.identifier()?;
-    match self.peek() {
-      LParen => {
-        let tuple_members = delimited!(self, LParen, type_name, Comma, RParen);
-        Ok(TupleStruct(name, tuple_members))
-      },
-      LCurlyBrace => {
-        let typed_identifier_list = delimited!(self, LCurlyBrace, typed_identifier, Comma, RCurlyBrace);
-        Ok(Record(name, typed_identifier_list))
-      },
-      _ => Ok(UnitStruct(name))
-    }
-    */
-
     Ok(match self.peek() {
       Identifier(_) => {
         let id = self.identifier()?;
@@ -729,6 +714,10 @@ impl Parser {
         let Expression(expr_type, _) = self.number_literal()?;
         Pattern::Literal(PatternLiteral::NumPattern(expr_type))
       },
+      Underscore => {
+        self.next();
+        Pattern::Ignored
+      },
       other => return ParseError::new(&format!("{:?} is not a valid Pattern", other))
     })
   });

schala-repl/src/lib.rs

@@ -413,13 +413,6 @@ impl Repl {
         }
 
         writeln!(buf, "").unwrap();
-
-        /*
-        writeln!(buf, "exit | quit - exit the REPL").unwrap();
-        writeln!(buf, "debug [show|hide] <pass_name> - show or hide debug info for a given pass").unwrap();
-        writeln!(buf, "debug passes - display the names of all passes").unwrap();
-        writeln!(buf, "lang [prev|next|go <name> |show] - toggle to previous or next language, go to a specific language by name, or show all languages").unwrap();
-        */
         writeln!(buf, "Language-specific help for {}", lang.get_language_name()).unwrap();
         writeln!(buf, "-----------------------").unwrap();
         writeln!(buf, "{}", lang.custom_interpreter_directives_help()).unwrap();