Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
LetToken |
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| 3.3333333333333335;3.333 |
1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.tapestry.script; | |
16 | ||
17 | import java.util.Map; | |
18 | ||
19 | import org.apache.hivemind.Location; | |
20 | ||
21 | /** | |
22 | * Allows for the creation of new symbols that can be used in the script or | |
23 | * returned to the caller. | |
24 | * <p> | |
25 | * The <let> tag wraps around static text and <insert> elements. The | |
26 | * results are trimmed. | |
27 | * | |
28 | * @author Howard Lewis Ship | |
29 | * @since 0.2.9 | |
30 | */ | |
31 | ||
32 | class LetToken extends AbstractToken | |
33 | { | |
34 | ||
35 | private String _key; | |
36 | private boolean _unique; | |
37 | 0 | private int _bufferLengthHighwater = 20; |
38 | ||
39 | public LetToken(String key, boolean unique, Location location) | |
40 | { | |
41 | 0 | super(location); |
42 | ||
43 | 0 | _key = key; |
44 | 0 | _unique = unique; |
45 | 0 | } |
46 | ||
47 | public void write(StringBuffer buffer, ScriptSession session) | |
48 | { | |
49 | 0 | if (buffer != null) throw new IllegalArgumentException(); |
50 | ||
51 | 0 | StringBuffer useBuffer = new StringBuffer(_bufferLengthHighwater); |
52 | ||
53 | 0 | writeChildren(useBuffer, session); |
54 | ||
55 | // Store the symbol back into the root set of symbols. | |
56 | ||
57 | 0 | Map symbols = session.getSymbols(); |
58 | ||
59 | 0 | String value = useBuffer.toString().trim(); |
60 | ||
61 | 0 | if (_unique) { |
62 | 0 | value = session.getUniqueString(value); |
63 | ||
64 | // unique in scripts is mostly used to generate javascript identifiers | |
65 | 0 | value = makeValidIdentifier(value); |
66 | } | |
67 | ||
68 | 0 | symbols.put(_key, value); |
69 | ||
70 | // Store the buffer length from this run for the next run, since its | |
71 | // going to be approximately the right size. | |
72 | ||
73 | 0 | _bufferLengthHighwater = Math.max(_bufferLengthHighwater, useBuffer |
74 | .length()); | |
75 | 0 | } |
76 | ||
77 | /** | |
78 | * Replaces hyphens, colons and periods (which are allowed in html | |
79 | * but not in javascript identifiers) with underscores. | |
80 | */ | |
81 | private static String makeValidIdentifier(String id) { | |
82 | 0 | char[] chars = id.toCharArray(); |
83 | 0 | for (int i=0; i<chars.length; i++) { |
84 | 0 | char c = chars[i]; |
85 | 0 | if (c==':' || c=='-' || c=='.') |
86 | 0 | chars[i]='_'; |
87 | } | |
88 | 0 | return new String(chars); |
89 | } | |
90 | } |