From bca0ca0dec74c60c83055dfaf05a71456aa1bb56 Mon Sep 17 00:00:00 2001
From: Shivam Sarodia <ssarodia@gmail.com>
Date: Tue, 2 May 2017 04:09:46 -0400
Subject: [PATCH] Implement empty statement

---
 shivyc/parser/statement.py             |  3 +++
 shivyc/tree/nodes.py                   | 12 ++++++++++++
 tests/frontend_tests/empty_statement.c |  5 +++++
 3 files changed, 20 insertions(+)
 create mode 100644 tests/frontend_tests/empty_statement.c

diff --git a/shivyc/parser/statement.py b/shivyc/parser/statement.py
index 2214c30..05bf746 100644
--- a/shivyc/parser/statement.py
+++ b/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
diff --git a/shivyc/tree/nodes.py b/shivyc/tree/nodes.py
index e780bf0..3252050 100644
--- a/shivyc/tree/nodes.py
+++ b/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."""
 
diff --git a/tests/frontend_tests/empty_statement.c b/tests/frontend_tests/empty_statement.c
new file mode 100644
index 0000000..48823e7
--- /dev/null
+++ b/tests/frontend_tests/empty_statement.c
@@ -0,0 +1,5 @@
+int main() {
+  ;;;;;
+  while(0);
+  for(;0;);
+}