add basic, parameter-less functions

parser/Parser.py

@@ -31,6 +31,10 @@ class Parser(object):
         'unit_item : c_expr SEMICOLON'
         p[0] = p[1]
 
+    def p_unit_item_function(self, p):
+        'unit_item : function'
+        p[0] = p[1]
+
     def p_statement(self, p):
         'statement : expr SEMICOLON'
         p[0] = StatementNode([p[1]])
@@ -43,6 +47,29 @@ class Parser(object):
         'c_expr : C LPAREN STRING RPAREN'
         p[0] = CExprNode(p[3])
 
+    def p_function(self, p):
+        'function : type ID LPAREN RPAREN LCURLY function_items RCURLY'
+        p[0] = FunctionNode(p[2], p[1], None, p[6])
+
+    def p_function_items(self, p):
+        'function_items : function_item function_items'
+        p[0] = Node([p[1] + p[2].children])
+
+    def p_function_items_empty(self, p):
+        'function_items : empty'
+        p[0] = p[1]
+
+    def p_function_item_stmt(self, p):
+        'function_item : statement'
+        p[0] = p[1]
+
+    def p_type(self, p):
+        '''type : CHAR
+                | SHORT
+                | INT
+                | LONG'''
+        p[0] = p[1]
+
     def p_empty(self, p):
         'empty :'
         p[0] = Node()

parser/nodes.py

@@ -25,3 +25,9 @@ class CExprNode(ExprNode):
 class UnitNode(Node):
     def __init__(self, children=None):
         Node.__init__(self, children)
+
+class FunctionNode(Node):
+    def __init__(self, name, ret_type, children=None):
+        Node.__init__(self, children)
+        self.name = name
+        self.ret_type = ret_type