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Java > Open Source Codes > com > google > gwt > dev > jjs > impl > AssertionRemover


1 /*
2  * Copyright 2007 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * 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, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.dev.jjs.impl;
17
18 import com.google.gwt.dev.jjs.ast.Context;
19 import com.google.gwt.dev.jjs.ast.JAssertStatement;
20 import com.google.gwt.dev.jjs.ast.JBlock;
21 import com.google.gwt.dev.jjs.ast.JModVisitor;
22 import com.google.gwt.dev.jjs.ast.JProgram;
23 import com.google.gwt.dev.jjs.ast.JStatement;
24
25 /**
26  * Removes all assertion statements from the AST.
27  */
28 public class AssertionRemover {
29
30   /**
31    * Removes all asserts.
32    */
33   public class AssertVisitor extends JModVisitor {
34
35     public void endVisit(JAssertStatement x, Context ctx) {
36       removeMe(x, ctx);
37     }
38
39     private void removeMe(JStatement stmt, Context ctx) {
40       if (ctx.canRemove()) {
41         ctx.removeMe();
42       } else {
43         // empty block statement
44 ctx.replaceMe(new JBlock(program, stmt.getSourceInfo()));
45       }
46     }
47   }
48
49   public static void exec(JProgram program) {
50     new AssertionRemover(program).execImpl();
51   }
52
53   private final JProgram program;
54
55   public AssertionRemover(JProgram program) {
56     this.program = program;
57   }
58
59   private void execImpl() {
60     AssertVisitor assertVisitor = new AssertVisitor();
61     assertVisitor.accept(program);
62   }
63 }
64
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