Update method names for parser and add 2 docstrings.

parser.py

@@ -466,12 +466,25 @@ class LLVMParser(object):
         self.tokens += self.reserved.values()
 
     def build(self, **kwargs):
+        """
+        Build the parser.
+
+        This method builds the parsing tables and initializes the
+        internal lexer and parser variables. This method must be
+        called prior to parsing.
+
+        """
         self.lexer = lex.lex(module=self, **kwargs)
         self.parser = yacc.yacc(module=self, **kwargs)
 
-    def test(self, data):
-        result = self.parser.parse(data, lexer=self.lexer)
-        print(result)
+    def parse(self, text):
+        """
+        Generate AST from text.
+
+        Return a AST representation of the llvm program from text.
+
+        """
+        return self.parser.parse(text, lexer=self.lexer)
 
 
 if __name__ == '__main__':
@@ -483,4 +496,4 @@ define void @tigermain (i64 %U_mainSL_8, i64 %U_mainDummy_9) {
  ret i64 %a
 }
     '''
-    p.test(data)
+    print(p.parse(data))