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30 day Evaluation License registered to hlship@comcast.net Your 30 day evaluation period has expired. Please visit http://www.cenqua.com to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
AbstractTokenRule.java | 95.8% | 100% | 100% | 98.9% |
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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 org.apache.hivemind.Location; | |
18 | import org.apache.tapestry.util.xml.BaseRule; | |
19 | import org.apache.tapestry.util.xml.RuleDirectedParser; | |
20 | ||
21 | /** | |
22 | * Base class for the rules that build {@link org.apache.tapestry.script.IScriptToken}s. | |
23 | * Used with classes that can contain a mix of text and elements (those that | |
24 | * accept "full content"). | |
25 | * | |
26 | * | |
27 | * @author Howard Lewis Ship | |
28 | * @since 3.0 | |
29 | **/ | |
30 | ||
31 | abstract class AbstractTokenRule extends BaseRule | |
32 | { | |
33 | ||
34 | /** | |
35 | * Adds a token to its parent, the top object on the stack. | |
36 | */ | |
37 | 19 | protected void addToParent(RuleDirectedParser parser, IScriptToken token) |
38 | { | |
39 | 19 | IScriptToken parent = (IScriptToken) parser.peek(); |
40 | ||
41 | 19 | parent.addToken(token); |
42 | } | |
43 | ||
44 | /** | |
45 | * Peeks at the top object on the stack (which must be a {@link IScriptToken}), | |
46 | * and converts the text into a series of {@link org.apache.tapestry.script.StaticToken} and | |
47 | * {@link org.apache.tapestry.script.InsertToken}s. | |
48 | */ | |
49 | ||
50 | 22 | public void content(RuleDirectedParser parser, String content) |
51 | { | |
52 | 22 | IScriptToken token = (IScriptToken) parser.peek(); |
53 | ||
54 | 22 | addTextTokens(token, content, parser.getLocation()); |
55 | } | |
56 | ||
57 | private static final int STATE_START = 0; | |
58 | private static final int STATE_DOLLAR = 1; | |
59 | private static final int STATE_COLLECT_EXPRESSION = 2; | |
60 | ||
61 | /** | |
62 | * Parses the provided text and converts it into a series of | |
63 | */ | |
64 | 22 | protected void addTextTokens(IScriptToken token, String text, Location location) |
65 | { | |
66 | 22 | char[] buffer = text.toCharArray(); |
67 | 22 | int state = STATE_START; |
68 | 22 | int blockStart = 0; |
69 | 22 | int blockLength = 0; |
70 | 22 | int expressionStart = -1; |
71 | 22 | int expressionLength = 0; |
72 | 22 | int i = 0; |
73 | 22 | int braceDepth = 0; |
74 | ||
75 | 22 | while (i < buffer.length) |
76 | { | |
77 | 290 | char ch = buffer[i]; |
78 | ||
79 | 290 | switch (state) |
80 | { | |
81 | 215 | case STATE_START : |
82 | ||
83 | 215 | if (ch == '$') |
84 | { | |
85 | 8 | state = STATE_DOLLAR; |
86 | 8 | i++; |
87 | 8 | continue; |
88 | } | |
89 | ||
90 | 207 | blockLength++; |
91 | 207 | i++; |
92 | 207 | continue; |
93 | ||
94 | 7 | case STATE_DOLLAR : |
95 | ||
96 | 7 | if (ch == '{') |
97 | { | |
98 | 6 | state = STATE_COLLECT_EXPRESSION; |
99 | 6 | i++; |
100 | ||
101 | 6 | expressionStart = i; |
102 | 6 | expressionLength = 0; |
103 | 6 | braceDepth = 1; |
104 | ||
105 | 6 | continue; |
106 | } | |
107 | ||
108 | // The '$' was just what it was, not the start of a ${} expression | |
109 | // block, so include it as part of the static text block. | |
110 | ||
111 | 1 | blockLength++; |
112 | ||
113 | 1 | state = STATE_START; |
114 | 1 | continue; |
115 | ||
116 | 68 | case STATE_COLLECT_EXPRESSION : |
117 | ||
118 | 68 | if (ch != '}') |
119 | { | |
120 | 62 | if (ch == '{') |
121 | 1 | braceDepth++; |
122 | ||
123 | 62 | i++; |
124 | 62 | expressionLength++; |
125 | 62 | continue; |
126 | } | |
127 | ||
128 | 6 | braceDepth--; |
129 | ||
130 | 6 | if (braceDepth > 0) |
131 | { | |
132 | 1 | i++; |
133 | 1 | expressionLength++; |
134 | 1 | continue; |
135 | } | |
136 | ||
137 | // Hit the closing brace of an expression. | |
138 | ||
139 | // Degenerate case: the string "${}". | |
140 | ||
141 | 5 | if (expressionLength == 0) |
142 | 1 | blockLength += 3; |
143 | ||
144 | 5 | if (blockLength > 0) |
145 | 5 | token.addToken(constructStatic(text, blockStart, blockLength, location)); |
146 | ||
147 | 5 | if (expressionLength > 0) |
148 | { | |
149 | 4 | String expression = |
150 | text.substring(expressionStart, expressionStart + expressionLength); | |
151 | ||
152 | 4 | token.addToken(new InsertToken(expression, location)); |
153 | } | |
154 | ||
155 | 5 | i++; |
156 | 5 | blockStart = i; |
157 | 5 | blockLength = 0; |
158 | ||
159 | // And drop into state start | |
160 | ||
161 | 5 | state = STATE_START; |
162 | ||
163 | 5 | continue; |
164 | } | |
165 | ||
166 | } | |
167 | ||
168 | // OK, to handle the end. Couple of degenerate cases where | |
169 | // a ${...} was incomplete, so we adust the block length. | |
170 | ||
171 | 22 | if (state == STATE_DOLLAR) |
172 | 1 | blockLength++; |
173 | ||
174 | 22 | if (state == STATE_COLLECT_EXPRESSION) |
175 | 1 | blockLength += expressionLength + 2; |
176 | ||
177 | 22 | if (blockLength > 0) |
178 | 21 | token.addToken(constructStatic(text, blockStart, blockLength, location)); |
179 | } | |
180 | ||
181 | 26 | private IScriptToken constructStatic( |
182 | String text, | |
183 | int blockStart, | |
184 | int blockLength, | |
185 | Location location) | |
186 | { | |
187 | 26 | String literal = text.substring(blockStart, blockStart + blockLength); |
188 | ||
189 | 26 | return new StaticToken(literal, location); |
190 | } | |
191 | } |
|