Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
AbstractTokenRule |
|
| 4.75;4.75 |
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 | 0 | abstract class AbstractTokenRule extends BaseRule |
32 | { | |
33 | ||
34 | private static final int STATE_START = 0; | |
35 | private static final int STATE_DOLLAR = 1; | |
36 | private static final int STATE_COLLECT_EXPRESSION = 2; | |
37 | ||
38 | /** | |
39 | * Adds a token to its parent, the top object on the stack. | |
40 | */ | |
41 | protected void addToParent(RuleDirectedParser parser, IScriptToken token) | |
42 | { | |
43 | 0 | IScriptToken parent = (IScriptToken) parser.peek(); |
44 | ||
45 | 0 | parent.addToken(token); |
46 | 0 | } |
47 | ||
48 | /** | |
49 | * {@inheritDoc} | |
50 | */ | |
51 | public void content(RuleDirectedParser parser, String content) | |
52 | { | |
53 | 0 | IScriptToken token = (IScriptToken) parser.peek(); |
54 | ||
55 | 0 | addTextTokens(token, content, parser.getLocation()); |
56 | 0 | } |
57 | ||
58 | /** | |
59 | * Parses the provided text and converts it into a series of . | |
60 | */ | |
61 | protected void addTextTokens(IScriptToken token, String text, Location location) | |
62 | { | |
63 | 0 | char[] buffer = text.toCharArray(); |
64 | 0 | int state = STATE_START; |
65 | 0 | int blockStart = 0; |
66 | 0 | int blockLength = 0; |
67 | 0 | int expressionStart = -1; |
68 | 0 | int expressionLength = 0; |
69 | 0 | int i = 0; |
70 | 0 | int braceDepth = 0; |
71 | ||
72 | 0 | while (i < buffer.length) |
73 | { | |
74 | 0 | char ch = buffer[i]; |
75 | ||
76 | 0 | switch (state) |
77 | { | |
78 | case STATE_START : | |
79 | ||
80 | 0 | if (ch == '$') |
81 | { | |
82 | 0 | state = STATE_DOLLAR; |
83 | 0 | i++; |
84 | 0 | continue; |
85 | } | |
86 | ||
87 | 0 | blockLength++; |
88 | 0 | i++; |
89 | 0 | continue; |
90 | ||
91 | case STATE_DOLLAR : | |
92 | ||
93 | 0 | if (ch == '{') |
94 | { | |
95 | 0 | state = STATE_COLLECT_EXPRESSION; |
96 | 0 | i++; |
97 | ||
98 | 0 | expressionStart = i; |
99 | 0 | expressionLength = 0; |
100 | 0 | braceDepth = 1; |
101 | ||
102 | 0 | continue; |
103 | } | |
104 | ||
105 | // The '$' was just what it was, not the start of a ${} expression | |
106 | // block, so include it as part of the static text block. | |
107 | ||
108 | 0 | blockLength++; |
109 | ||
110 | 0 | state = STATE_START; |
111 | 0 | continue; |
112 | ||
113 | case STATE_COLLECT_EXPRESSION : | |
114 | ||
115 | 0 | if (ch != '}') |
116 | { | |
117 | 0 | if (ch == '{') |
118 | 0 | braceDepth++; |
119 | ||
120 | 0 | i++; |
121 | 0 | expressionLength++; |
122 | 0 | continue; |
123 | } | |
124 | ||
125 | 0 | braceDepth--; |
126 | ||
127 | 0 | if (braceDepth > 0) |
128 | { | |
129 | 0 | i++; |
130 | 0 | expressionLength++; |
131 | 0 | continue; |
132 | } | |
133 | ||
134 | // Hit the closing brace of an expression. | |
135 | ||
136 | // Degenerate case: the string "${}". | |
137 | ||
138 | 0 | if (expressionLength == 0) |
139 | 0 | blockLength += 3; |
140 | ||
141 | 0 | if (blockLength > 0) |
142 | 0 | token.addToken(constructStatic(text, blockStart, blockLength, location)); |
143 | ||
144 | 0 | if (expressionLength > 0) |
145 | { | |
146 | 0 | String expression = |
147 | text.substring(expressionStart, expressionStart + expressionLength); | |
148 | ||
149 | 0 | token.addToken(new InsertToken(expression, location)); |
150 | } | |
151 | ||
152 | 0 | i++; |
153 | 0 | blockStart = i; |
154 | 0 | blockLength = 0; |
155 | ||
156 | // And drop into state start | |
157 | ||
158 | 0 | state = STATE_START; |
159 | ||
160 | 0 | continue; |
161 | } | |
162 | ||
163 | 0 | } |
164 | ||
165 | // OK, to handle the end. Couple of degenerate cases where | |
166 | // a ${...} was incomplete, so we adust the block length. | |
167 | ||
168 | 0 | if (state == STATE_DOLLAR) |
169 | 0 | blockLength++; |
170 | ||
171 | 0 | if (state == STATE_COLLECT_EXPRESSION) |
172 | 0 | blockLength += expressionLength + 2; |
173 | ||
174 | 0 | if (blockLength > 0) |
175 | 0 | token.addToken(constructStatic(text, blockStart, blockLength, location)); |
176 | 0 | } |
177 | ||
178 | private IScriptToken constructStatic( | |
179 | String text, | |
180 | int blockStart, | |
181 | int blockLength, | |
182 | Location location) | |
183 | { | |
184 | 0 | String literal = text.substring(blockStart, blockStart + blockLength); |
185 | ||
186 | 0 | return new StaticToken(literal, location); |
187 | } | |
188 | } |