1 /*
2 * Copyright 2004-2005, 2008 the original author or authors.
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 net.sf.morph.lang.support;
17
18 import java.util.StringTokenizer;
19
20 import net.sf.morph.util.MorphStringTokenizer;
21 import net.sf.morph.util.StringUtils;
22
23 /**
24 * An expression parser for use with the simple language.
25 *
26 * @author Matt Sgarlata
27 * @since Nov 28, 2004
28 */
29 public class SimpleExpressionParser extends BaseExpressionParser implements ExpressionParser {
30
31 private static final String DELIMITERS = "[]()\"'.";
32
33 /**
34 * {@inheritDoc}
35 */
36 public String[] parseImpl(String expression) throws Exception {
37 StringTokenizer tokenizer = new MorphStringTokenizer(
38 StringUtils.removeWhitespace(expression), DELIMITERS);
39 // Don't use a converter to do this conversion because that makes
40 // testing of morph difficult and it isn't as fast as doing the
41 // conversion directly. Using a converter would make testing more
42 // difficult because the parser breaks if the containercopier
43 // breaks, which happens a lot for whatever reason, and a lot of things
44 // depend on the parser). The speed issue is very important here,
45 // because the simple expression parser is used very heavily by other
46 // parts of the framework (e.g. contexts)
47 String[] tokens = new String[tokenizer.countTokens()];
48 for (int i=0; i<tokens.length; i++) {
49 tokens[i] = tokenizer.nextToken();
50 }
51 return tokens;
52 }
53
54 }