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1
19
20 package edu.umd.cs.findbugs.sourceViewer;
21
22 import java.text.CharacterIterator  ;
23 import java.util.HashSet ;
24
25 public class JavaScanner {
26 public final static int NORMAL_TEXT = 0;
27 public final static int COMMENT= 1;
28 public final static int JAVADOC = 2;
29
30 public final static int KEYWORD = 3;
31 public final static int QUOTE= 4;
32 public final static int EOF = -1;
33
34
35
36
37 private final static HashSet <String > KEYWORDS = new HashSet <String >();
38
39 private final static int MAX_KEYWORD_LENGTH;
40
41
42
43
44
45 static {
46 String [] keywordList = new String [] { "abstract", "assert", "boolean",
47 "break", "byte", "case", "catch", "char", "class", "const",
48 "continue", "default", "do", "double", "else", "enum",
49 "extends", "false", "final", "finally", "float", "for", "goto",
50 "if", "implements", "import", "instanceof", "int", "interface",
51 "long", "native", "new", "null", "package", "private",
52 "protected", "public", "return", "short", "static", "strictfp",
53 "super", "switch", "synchronized", "this", "throw", "throws",
54 "transient", "true", "try", "void", "volatile", "while" };
55 int max = 0;
56 for (String s : keywordList) {
57 if (max < s.length())
58 max = s.length();
59 KEYWORDS.add(s);
60 }
61 MAX_KEYWORD_LENGTH = max;
62 }
63
64 private final StringBuffer buf = new StringBuffer ();
65
66 private int endPosition;
67
68 private final CharacterIterator iterator;
69
70 private int kind;
71
72 private int startPosition;
73
74 public JavaScanner(CharacterIterator iterator) {
75 this.iterator = iterator;
76 }
77
78 public int getStartPosition() {
79 return startPosition;
80 }
81
82 public int getEndPosition() {
83 return iterator.getIndex();
84 }
85
86 public int getLength() {
87 return iterator.getIndex() - startPosition;
88 }
89 public int getKind() {
90 return kind;
91 }
92 public int next() {
93 startPosition = iterator.getIndex();
94 char c = iterator.current();
95 iterator.next(); if (c == CharacterIterator.DONE) {
97 kind = EOF;
98 }
99 else if (Character.isJavaIdentifierStart(c)) {
100 buf.append(c);
101 boolean couldBeKeyword = Character.isLowerCase(c);
102 while (true) {
103 c = iterator.current();
104 if (!Character.isJavaIdentifierPart(c))
105 break;
106 buf.append(c);
107 if (couldBeKeyword) {
108 if (!Character.isLowerCase(c)
109 || buf.length() >= MAX_KEYWORD_LENGTH)
110 couldBeKeyword = false;
111 }
112 c = iterator.next();
113 }
114 kind = NORMAL_TEXT;
115 if (couldBeKeyword) {
116 if (KEYWORDS.contains(buf.toString()))
117 kind = KEYWORD;
118 }
119 buf.setLength(0);
120 } else if (c == '/') {
121 char c2 = iterator.current();
122 if (c2 == '/') {
123 while (true) {
124 c2 = iterator.next();
125 if (c2 == '\n' || c2 == '\r' || c2 == CharacterIterator.DONE)
126 break;
127 }
128 kind = COMMENT;
129 return kind;
130 } else if (c2 == '*') {
131 scanComment: while (c2 != CharacterIterator.DONE) {
132 c2 = iterator.next();
133 if (c2 == '*') {
134 do {
135 c2 = iterator.next();
136 if (c2 == '/')
137 break scanComment;
138 } while(c2 == '*');
139 }
140 }
141 kind = JAVADOC;
142 return kind;
143 }
144 } else if (c == '"') {
145 kind = QUOTE;
146 char c2 = iterator.current();
147 while (c2 != '"' && c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE) {
148 if (c2 == '\\') {
149 c2 = iterator.next();
150 if (c2 == '\n' || c2 == '\r')
151 break;
152 }
153 c2 = iterator.next();
154 }
155 iterator.next(); } else if (c == '\'') {
157 kind = QUOTE; char c2 = iterator.current();
160 if (c2 == '\\') c2 = iterator.next(); if (c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE)
162 c2 = iterator.next(); if (c2 != '\n' && c2 != '\r' && c2 != CharacterIterator.DONE)
164 iterator.next();
166 } else
167 kind = NORMAL_TEXT;
168 return kind;
170 }
171
172 }
173 |
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