/
BasicJavadocLexer.java
216 lines (193 loc) · 7.09 KB
/
BasicJavadocLexer.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
/*
* Copyright 2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gradlebuild.docs.dsl.docbook;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
/**
* Converts the main description of a javadoc comment into a stream of tokens.
*/
class BasicJavadocLexer implements JavadocLexer {
private static final Pattern HTML_ELEMENT = Pattern.compile("(?s)<\\\\?[^<]+?>");
private static final Pattern ELEMENT_ATTRIBUTE = Pattern.compile("(?s)\\w+(\\s*=\\s*('.*?')|(\".*?\"))?");
private static final Pattern END_ATTRIBUTE_NAME = Pattern.compile("=|(\\s)|(/>)|>");
private static final Pattern ATTRIBUTE_SEPARATOR = Pattern.compile("\\s*=\\s*");
private static final Pattern END_ELEMENT_NAME = Pattern.compile("\\s+|(/>)|>");
private static final Pattern END_ELEMENT = Pattern.compile("(/>)|>");
private static final Pattern HTML_ENCODED_CHAR = Pattern.compile("&#\\d+;");
private static final Pattern HTML_ENTITY = Pattern.compile("&.+?;");
private static final Pattern TAG = Pattern.compile("(?s)\\{@.+?\\}");
private static final Pattern END_TAG_NAME = Pattern.compile("(?s)\\s|}");
private static final Pattern WHITESPACE_WITH_EOL = Pattern.compile("(?s)\\s+");
private static final String START_HTML_COMMENT = "<!--";
private static final String END_HTML_COMMENT = "-->";
private static final Map<String, String> ENTITIES = new HashMap<String, String>();
static {
ENTITIES.put("amp", "&");
ENTITIES.put("lt", "<");
ENTITIES.put("gt", ">");
ENTITIES.put("quot", "\"");
ENTITIES.put("apos", "'");
}
private final JavadocScanner scanner;
BasicJavadocLexer(JavadocScanner scanner) {
this.scanner = scanner;
}
public void pushText(String rawCommentText) {
scanner.pushText(rawCommentText);
}
@Override
public void visit(TokenVisitor visitor) {
while (!scanner.isEmpty()) {
if (scanner.lookingAt(START_HTML_COMMENT)) {
skipComment();
continue;
}
if (scanner.lookingAt(HTML_ELEMENT)) {
parseStartElement(visitor);
continue;
}
if (scanner.lookingAt(TAG)) {
parseJavadocTag(visitor);
continue;
}
StringBuilder text = new StringBuilder();
while (!scanner.isEmpty()) {
if (scanner.lookingAt(START_HTML_COMMENT)) {
skipComment();
continue;
}
if (scanner.lookingAt(HTML_ELEMENT)) {
break;
}
if (scanner.lookingAt(TAG)) {
break;
}
if (scanner.lookingAt(HTML_ENCODED_CHAR)) {
parseHtmlEncodedChar(text);
} else if (scanner.lookingAt(HTML_ENTITY)) {
parseHtmlEntity(text);
} else {
text.append(scanner.getFirst());
scanner.next();
}
}
visitor.onText(text.toString());
}
visitor.onEnd();
}
private void skipComment() {
scanner.next(4);
while (!scanner.isEmpty() && !scanner.lookingAt(END_HTML_COMMENT)) {
scanner.next();
}
if (!scanner.isEmpty()) {
scanner.next(3);
}
}
private void parseHtmlEntity(StringBuilder buffer) {
scanner.next();
scanner.mark();
scanner.find(';');
String value = ENTITIES.get(scanner.region().toLowerCase());
buffer.append(value);
scanner.next();
}
private void parseHtmlEncodedChar(StringBuilder buffer) {
scanner.next(2);
scanner.mark();
scanner.find(';');
String value = new String(new char[]{(char) Integer.parseInt(scanner.region())});
buffer.append(value);
scanner.next();
}
private void parseJavadocTag(TokenVisitor visitor) {
// start of tag marker
scanner.next(2);
// tag name
scanner.mark();
scanner.find(END_TAG_NAME);
String tagName = scanner.region();
visitor.onStartJavadocTag(tagName);
scanner.skip(WHITESPACE_WITH_EOL);
// value
if (!scanner.lookingAt('}')) {
scanner.mark();
scanner.find('}');
String value = scanner.region();
visitor.onText(value);
}
// end of tag marker
if (scanner.lookingAt('}')) {
visitor.onEndJavadocTag(tagName);
scanner.next();
}
}
private void parseStartElement(TokenVisitor visitor) {
// start element marker
scanner.next();
boolean isEnd = false;
if (scanner.lookingAt('/')) {
isEnd = true;
scanner.next();
}
// element name
scanner.skip(WHITESPACE_WITH_EOL);
scanner.mark();
scanner.find(END_ELEMENT_NAME);
String elementName = scanner.region().toLowerCase();
if (isEnd) {
visitor.onEndHtmlElement(elementName);
} else {
visitor.onStartHtmlElement(elementName);
}
// attributes
scanner.skip(WHITESPACE_WITH_EOL);
while (!scanner.isEmpty() && scanner.lookingAt(ELEMENT_ATTRIBUTE)) {
// attribute name
scanner.mark();
scanner.find(END_ATTRIBUTE_NAME);
String attrName = scanner.region();
// separator
scanner.skip(ATTRIBUTE_SEPARATOR);
// value
char quote = scanner.getFirst();
scanner.next();
StringBuilder attrValue = new StringBuilder();
while (!scanner.isEmpty() && !scanner.lookingAt(quote)) {
if (scanner.lookingAt(HTML_ENCODED_CHAR)) {
parseHtmlEncodedChar(attrValue);
} else if (scanner.lookingAt(HTML_ENTITY)) {
parseHtmlEntity(attrValue);
} else {
attrValue.append(scanner.getFirst());
scanner.next();
}
}
visitor.onHtmlElementAttribute(attrName, attrValue.toString());
scanner.next();
scanner.skip(WHITESPACE_WITH_EOL);
}
if (!isEnd) {
visitor.onStartHtmlElementComplete(elementName);
}
// end element marker
if (scanner.lookingAt('/')) {
visitor.onEndHtmlElement(elementName);
}
scanner.skip(END_ELEMENT);
}
}