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 17 package com.google.clearsilver.jsilver.functions; 18 19 import com.google.clearsilver.jsilver.values.Value; 20 21 import java.io.IOException; 22 23 /** 24 * Execute functions in templates. 25 */ 26 public 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
