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  1. import java.util.regex.*;
  2. import java.util.*;
  3.  
  4. class T {
  5.     public static String join(String sep, Iterable<String> it) {
  6.         String joined = "";
  7.         boolean first = true;
  8.  
  9.         for (String s : it) {
  10.             if (first)
  11.                 first = false;
  12.             else
  13.                 joined += sep;
  14.             joined += s;
  15.         }
  16.         return joined;
  17.     }
  18.  
  19.     public static Iterable<String> split(String s) {
  20.         List<String> result = new LinkedList<String>();
  21.         Stack<String> stack = new Stack<String>();
  22.         Pattern pattern = Pattern.compile("[,\\[\\]]|.+?");
  23.         Matcher matcher = pattern.matcher(s);
  24.  
  25.         stack.push("");
  26.         while (matcher.find()) {
  27.             String token = matcher.group();
  28.             if (token.equals("[")) {
  29.                 stack.push("");
  30.             } else if (token.equals("]")) {
  31.                 if (! stack.peek().isEmpty())
  32.                     result.add(join(".", stack));
  33.                 stack.pop();
  34.                 stack.pop();
  35.                 stack.push("");
  36.             } else if (token.equals(",")) {
  37.                 if (! stack.peek().isEmpty())
  38.                     result.add(join(".", stack));
  39.             } else {
  40.                 stack.pop();
  41.                 stack.push(token);
  42.             }
  43.         }
  44.         if (! (stack.isEmpty() || stack.peek().isEmpty()))
  45.             result.add(join(".", stack));
  46.         return result;
  47.     }
  48.  
  49.     public static void main(String[] args) {
  50.         String text = "a,b,c[a,b,c[a]],d";
  51.         for (String s : split(text))
  52.             System.out.println(s);
  53.     }
  54. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
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a
b
c.a
c.b
c.c.a
d
https://ideone.com/ObBMQ8
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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