1  /**
 2      * Count the number of chars in the input stream.
 3      * @param is the InputStream to count.
 4      * @param ps the PrintStream to write the result.
 5      */
 6     public void countChar(InputStream is, PrintStream ps) {
 7         try {
 8             int count = is.available();
 9             String note = ", " + "字符数: ";
10             ps.println(fileName + note + count);
11         } catch (IOException e) {
12             e.printStackTrace();
13         }
14     }
15 
16 
17     /**
18      * Count the number of lines in the input stream.
19      * @param is the InputStream to count.
20      * @param ps the PrintStream to write the result.
21      */
22     public void countLines(InputStream is, PrintStream ps) {
23         Scanner scanner = new Scanner(is);
24         int line = 0;
25         while (scanner.hasNextLine()) {
26             line++;
27             scanner.nextLine();
28         }
29         String note = ", " + "行数: ";
30         ps.println(fileName + note + line);
31     }
32 
33 
34     /**
35      * Count words without StopList.
36      *
37      * @see #countWordsWithStopList(InputStream, PrintStream, Set)
38      */
39     public void countWords(InputStream is, PrintStream ps) {
40         countWordsWithStopList(is, ps, null);
41     }
42 
43     /**
44      * Count the number of words in the input stream.
45      * According to the requirements, the only 4 legal delimiters are:
46      * space, comma, tab and line break;
47      *
48      * @param is the InputStream to count.
49      * @param ps the PrintStream to write the result.
50      * @param stopSet A set of words that shall not be included into the count.
51      */
52     public void countWordsWithStopList(InputStream is, PrintStream ps, Set<String> stopSet) {
53         Scanner scanner = new Scanner(is);
54         int words = 0;
55 
56         Pattern pattern = Pattern.compile("\\n+|\\t+|\\s+|,");
57         scanner.useDelimiter(pattern);
58         while (scanner.hasNext()) {
59             String word = scanner.next();
60             if (stopSet == null || !stopSet.contains(word)) {
61                 words++;
62             }
63         }
64 
65         String note = ", " + "单词数: ";
66         ps.println(fileName + note + words);
67     }
68 
69     /**
70      * Count the lines of code, comment and blank.
71      */
72     public void countCodeAndComment(InputStream is, PrintStream ps) {
73         Scanner scanner = new Scanner(is);
74         int code = 0;
75         int blank = 0;
76         int comment = 0;
77         String blankPattern = "[\\s\\t\\n]*[(){}]?";
78         String commentPattern = "([\\s\\t]*([})]?)((/\\*|//).*))|(\\*/)";
79         while (scanner.hasNextLine()) {
80             String line = scanner.nextLine();
81             if (Pattern.matches(blankPattern, line)) {
82                 blank++;
83             } else if (Pattern.matches(commentPattern, line)) {
84                 comment++;
85             } else {
86                 code++;
87             }
88         }
89         String note = ", " + "代码行/空行/注释行: ";
90         ps.println(fileName + note + code + "/" + blank + "/" + comment);
91     }