short function syntax fixes #152 (#199)

* short function syntax

* updating parser plus adding test

.vscode/launch.json

@@ -9,21 +9,19 @@
       "request": "launch",
       "name": "Launch",
       "args": [],
-            "program": "./target/debug/bin",
+      "program": "./target/debug/boa",
       "cwd": "${workspaceRoot}",
       "stopOnEntry": false,
-            "sourceLanguages": [
-                "rust"
-            ]
+      "sourceLanguages": ["rust"]
     },
     {
       "name": "(Windows) Launch",
       "type": "cppvsdbg",
       "request": "launch",
-            "program": "${workspaceFolder}/target/debug/bin.exe",
+      "program": "${workspaceFolder}/target/debug/boa.exe",
       "stopAtEntry": false,
       "cwd": "${workspaceFolder}",
-            "environment": [],
+      "environment": []
     }
   ]
 }

src/lib/syntax/parser.rs

@@ -529,12 +529,38 @@ impl Parser {
                             ))
                         }
                     };
+                    self.pos += 1;
+                    let value = match self.get_token(self.pos)?.data {
+                        TokenData::Punctuator(Punctuator::Colon) => {
+                            self.pos += 1;
+                            self.parse()?
+                        }
+                        TokenData::Punctuator(Punctuator::OpenParen) => {
                             self.pos += 1;
                             self.expect(
+                                TokenData::Punctuator(Punctuator::CloseParen),
+                                "Method Block",
+                            )?;
+                            self.pos += 1; // {
+                            let expr = self.parse()?;
+                            self.pos += 1;
+                            mk!(
+                                self,
+                                ExprDef::FunctionDecl(None, vec!(), Box::new(expr)),
+                                token
+                            )
+                        }
+                        _ => {
+                            return Err(ParseError::Expected(
+                                vec![
                                     TokenData::Punctuator(Punctuator::Colon),
+                                    TokenData::Punctuator(Punctuator::OpenParen),
+                                ],
+                                tk,
                                 "object declaration",
-                    )?;
-                    let value = self.parse()?;
+                            ))
+                        }
+                    };
                     map.insert(name, value);
                     self.pos += 1;
                 }
@@ -554,6 +580,13 @@ impl Parser {
                 self.pos += 1;
                 mk!(self, ExprDef::Block(exprs), token)
             }
+            // Empty Block
+            TokenData::Punctuator(Punctuator::CloseBlock)
+                if self.get_token(self.pos.wrapping_sub(2))?.data
+                    == TokenData::Punctuator(Punctuator::OpenBlock) =>
+            {
+                mk!(self, ExprDef::Block(vec!()), token)
+            }
             TokenData::Punctuator(Punctuator::Sub) => mk!(
                 self,
                 ExprDef::UnaryOp(UnaryOp::Minus, Box::new(self.parse()?))
@@ -889,6 +922,32 @@ mod tests {
             ))))],
         );
     }
+    #[test]
+    fn check_object() {
+        // Testing short function syntax
+        let mut object_properties: BTreeMap<String, Expr> = BTreeMap::new();
+        object_properties.insert(
+            String::from("a"),
+            Expr::new(ExprDef::Const(Const::Bool(true))),
+        );
+        object_properties.insert(
+            String::from("b"),
+            Expr::new(ExprDef::FunctionDecl(
+                None,
+                vec![],
+                Box::new(Expr::new(ExprDef::Block(vec![]))),
+            )),
+        );
+
+        check_parser(
+            "{
+              a: true,
+              b() {}
+            };
+            ",
+            &[Expr::new(ExprDef::ObjectDecl(Box::new(object_properties)))],
+        );
+    }
 
     #[test]
     fn check_array() {

tests/js/test.js

@@ -1,6 +1,8 @@
-///
-// Use this file to test your changes to boa.
-///
+let a = {
+  a: true,
+  b() {
+    return 2;
+  }
+};
 
-let a = Boolean(0);
-typeof a;
+console.log(a["b"]());