package java9;

 import java.io.IOException;

 import java.nio.file.Files;

 import java.nio.file.Paths;

 import java.util.List;

 import java.util.regex.Pattern;

 public class TTT {

     public static void main(String args[]) throws IOException {

         List<String> readAllLines = Files.readAllLines(Paths

                 .get("/Users/hongtaowang/git/spring-boot-jpa-demo/src/main/java/com/my/app/web/IndexController.java"));

         int issueLine = 29;

         String preMethodSignNumber = getPreMethodSignNumber(issueLine, readAllLines);

         System.out.println(preMethodSignNumber);

         String preSignEndChar = getPreSignEndChar(readAllLines, issueLine);

         System.out.println(preSignEndChar);

     }

     private static String getPreSignEndChar(List<String> readAllLines, int issueLine) {

         int nextMethodSignLine = getNextMethodSignNumber(issueLine, readAllLines);

         for (int endLineNumber = nextMethodSignLine - 1; endLineNumber > 0; endLineNumber--) {

             String endChar = readAllLines.get(endLineNumber - 1);

             if (endChar.contains("}")) {

                 return (endLineNumber) + " end     line " + endChar;

             }

         }

         return "";

     }

     private static int getNextMethodSignNumber(int i, List<String> readAllLines) {

         int j = i;

         for (; j < readAllLines.size(); j++) {

             String p = readAllLines.get(j - 1);

             boolean extracted = matchMethodSign(p);

             if (extracted) {

                 break;

             }

         }

         return j;

     }

     private static String getPreMethodSignNumber(int currentLine, List<String> readAllLines) {

         for (int preLine = currentLine - 1; preLine > 0; preLine--) {

             String preLineSource = readAllLines.get(preLine - 1);

             if (matchMethodSign(preLineSource)) {

                 return (preLine) + " end     line " + preLineSource;

             }

         }

         return "";

     }

     private static boolean matchMethodSign(String d) {

         String pattern = ".*[A-z].* .*[A-z1-9]\\(.*";

         boolean isMatch = Pattern.matches(pattern, d);

         if (!isMatch) {

             return false;

         }

         if (d.contains("return")) {

             return false;

         }

         if (d.contains("=")) {

             return false;

         }

         return true;

     }

 }