[移动开发]android studio插件 统计代码行数

一直好奇 这个插件如何统计代码行数 注释行数 和空行数的,
下载其jar包,查看源码发现,是这样的
学习下

boolean isInComment = false;
        Integer total = 0;
        Integer blank = 0;
        Integer comment = 0;
        Integer code = 0;

        try {
            BufferedInputStream inputStream = new BufferedInputStream(stream);
            LineNumberReader streamReader = new LineNumberReader(new InputStreamReader(inputStream));

            while(true) {
                while(true) {
                    String line;
                    do {
                        if (!streamReader.ready()) {
                            return new LOCBean(total, blank, comment, code);
                        }

                        line = streamReader.readLine();
                    } while(line == null);

                    total = total + 1;
                    line = line.trim();
                    if (line.length() == 0) {
                        blank = blank + 1;
                    } else if (!line.startsWith("//") && !line.startsWith("#")) {
                        if (isInComment) {
                            comment = comment + 1;
                            if (line.contains("*/") || line.contains("\"\"\"") || line.contains("'''") || line.contains("-->")) {
                                isInComment = false;
                            }
                        } else if (!line.equals("\"\"\"") && !line.equals("'''")) {
                            if ((!line.startsWith("/*") || !line.endsWith("*/")) && (!line.startsWith("\"\"\"") || !line.endsWith("\"\"\"")) && (!line.startsWith("<!--") || !line.endsWith("-->"))) {
                                if (!line.startsWith("/*") && !line.startsWith("\"\"\"") && !line.startsWith("<!--")) {
                                    code = code + 1;
                                } else {
                                    comment = comment + 1;
                                    if (!line.contains("*/") || !line.contains("\"\"\"") || !line.contains("-->")) {
                                        isInComment = true;
                                    }
                                }
                            } else {
                                comment = comment + 1;
                            }
                        } else {
                            comment = comment + 1;
                            isInComment = true;
                        }
                    } else {
                        comment = comment + 1;
                    }
                }
            }
        } catch (IOException var11) {
            var11.printStackTrace();
            return new LOCBean(total, blank, comment, code);
        }