01: /*
02: * Copyright 2007 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License. You may obtain a copy of
06: * the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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
45: .replaceMe(new JBlock(program, stmt
46: .getSourceInfo()));
47: }
48: }
49: }
50:
51: public static void exec(JProgram program) {
52: new AssertionRemover(program).execImpl();
53: }
54:
55: private final JProgram program;
56:
57: public AssertionRemover(JProgram program) {
58: this .program = program;
59: }
60:
61: private void execImpl() {
62: AssertVisitor assertVisitor = new AssertVisitor();
63: assertVisitor.accept(program);
64: }
65: }
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