1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.clearsilver.jsilver.functions;
18
19import com.google.clearsilver.jsilver.values.Value;
20
21import java.io.IOException;
22
23/**
24 * Execute functions in templates.
25 */
26public interface FunctionExecutor {
27
28  /**
29   * Lookup a function by name, execute it and return the results.
30   */
31  Value executeFunction(String functionName, Value... args);
32
33  /**
34   * Escapes some text.
35   *
36   * @param name Strategy for escaping text. If null or "none", text will be left as is.
37   * @param input Text to be escaped.
38   * @param output Where to write the result to.
39   */
40  void escape(String name, String input, Appendable output) throws IOException;
41
42  /**
43   * Look up a function by name, and report whether it is an escaping function.
44   */
45  boolean isEscapingFunction(String name);
46}
47