Add ObjBrace token

To distinguish between objects and code bodies, an object is delimited
by curly braces, prefixed with a percent sign. Ex:

    obj = %{
        key = value
    }

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/lexer.rs

@@ -95,6 +95,7 @@ impl<'t> Lexer<'t> {
             |(?P<rbracket>\])
             |(?P<lbrace>\{)
             |(?P<rbrace>\})
+            |(?P<objbrace>%\{)
             |(?P<comma>,)
             |(?P<eol>;)
             |(?P<newline>\n)
@@ -119,6 +120,7 @@ impl<'t> Lexer<'t> {
             ("rbracket", TokenKind::RBracket),
             ("lbrace", TokenKind::LBrace),
             ("rbrace", TokenKind::RBrace),
+            ("objbrace", TokenKind::ObjBrace),
             ("comma", TokenKind::Comma),
             ("plus", TokenKind::Plus),
             ("minus", TokenKind::Minus),
@@ -281,6 +283,7 @@ mod test {
         test_token!(")", TokenKind::RParen);
         test_token!("{", TokenKind::LBrace);
         test_token!("}", TokenKind::RBrace);
+        test_token!("%{", TokenKind::ObjBrace);
         test_token!("[", TokenKind::LBracket);
         test_token!("]", TokenKind::RBracket);
         test_token!(",", TokenKind::Comma);

src/syn/token.rs

@@ -16,6 +16,7 @@ pub enum TokenKind {
     RBrace,
     LBracket,
     RBracket,
+    ObjBrace,
     Comma,
 
     Eq,
@@ -50,6 +51,7 @@ impl Display for TokenKind {
             RParen => "right paren",
             LBrace => "left brace",
             RBrace => "right brace",
+            ObjBrace => "object brace",
             LBracket => "left bracket",
             RBracket => "right bracket",
             Comma => "comma",