Implement empty statement

Author: ShivamSarodia

shivyc/parser/statement.py

@@ -226,6 +226,9 @@ def parse_expr_statement(index):
     Ex: a = 3 + 4
 
     """
+    if token_is(index, token_kinds.semicolon):
+        return nodes.EmptyStatement(), index + 1
+
     node, index = parse_expression(index)
     index = match_token(index, token_kinds.semicolon, ParserError.AFTER)
     return nodes.ExprStatement(node), index

shivyc/tree/nodes.py

@@ -146,6 +146,18 @@ class Continue(_BreakContinue):
     descrip = "continue"
 
 
+class EmptyStatement(Node):
+    """Node for a statement which is just a semicolon."""
+
+    def __init__(self):
+        """Initialize node."""
+        super().__init__()
+
+    def make_il(self, il_code, symbol_table, c):
+        """Nothing to do for a blank statement."""
+        pass
+
+
 class ExprStatement(Node):
     """Node for a statement which contains one expression."""
 

tests/frontend_tests/empty_statement.c

@@ -0,0 +1,5 @@
+int main() {
+  ;;;;;
+  while(0);
+  for(;0;);
+}