fix(parser): expressions with more than one plus or minus

Author: Dimitry-bit

docs/CFG-EBNF.md

@@ -59,7 +59,7 @@
 
 27. *Datatype* -> __int__ | __float__ | __string__
 
-28. *Expression* -> *Term* ( ( __-__ | __+__ ) *Term* )?
+28. *Expression* -> *Term* ( ( __-__ | __+__ ) *Expression* )?
 
 29. *Term* -> *Factor* ( ( __*__ | __/__ ) *Term* )?
 

docs/CFG.md

@@ -67,7 +67,7 @@
 
 31. *Datatype* -> __int__ | __float__ | __string__
 
-32. *Expression* -> *Term* ( ( __-__ | __+__ ) *Term*  | $\epsilon$ )
+32. *Expression* -> *Term* ( ( __-__ | __+__ ) *Expression*  | $\epsilon$ )
 
 33. *Term* -> *Factor* ( ( __*__ | __/__ ) *Term* | $\epsilon$ )
 

src/TinyCompiler/Parser.cs

@@ -447,7 +447,7 @@ private Node Expr()
             if (Match(TokenClass.Minus, TokenClass.Plus))
             {
                 n.Children.Add(PreviousNode());
-                n.Children.Add(Term());
+                n.Children.Add(Expr());
             }
 
             return n;