From e3c8753a4db671c1acbf27689a048b64e1d3ba16 Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Fri, 15 Jan 2016 01:04:54 -0800
Subject: [PATCH] Expression parsing

---
 src/parser.rs | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/parser.rs b/src/parser.rs
index 80d27f8..1167620 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -201,12 +201,29 @@ impl Parser {
         let expr = match self.peek() {
             Some(NumLiteral(n)) => { self.next(); Expression::Number(n) },
             Some(StrLiteral(s)) => { self.next(); Expression::StringLiteral(s) },
-            Some(Identifier(var)) => { self.next();  Expression::Variable(var) },
-            _ => unimplemented!()
+            Some(Identifier(var)) => {
+                self.next();
+                match self.peek() {
+                    Some(LParen) => try!(self.call_expr()),
+                    _ => Expression::Variable(var)
+                }
+            },
+            Some(LParen) => { try!(self.paren_expr()) }
+            Some(x) => return ParseError::result_from_str("Expected primary expression"),
+            None => return ParseError::result_from_str("Expected primary expression received EoI")
         };
 
         Ok(expr)
     }
+
+    fn call_expr(&mut self) -> ParseResult<Expression> {
+        unimplemented!()
+    }
+
+    fn paren_expr(&mut self) -> ParseResult<Expression> {
+
+        unimplemented!()
+    }
 }
 
 pub fn parse(tokens: &[Token], _parsed_tree: &[ASTNode]) -> ParseResult<AST> {