[Codewar] Strip Comments

 

https://www.codewars.com/kata/51c8e37cee245da6b40000bd/java

Codewars: Train your coding skills

Complete the solution so that it strips all text that follows any of a set of comment markers passed in. Any whitespace at the end of the line should also be stripped out.

 

1. Example:

Given an input string of:

      

      

      

    
    

      <java />
    
apples, pears # and bananas
grapes
bananas !apples

 

The output expected would be:

      

      

      

    
    

      <java />
    
apples, pears
grapes
bananas

The code would be called like so:

      

      

      

    
    

      <java />
    
var result = solution("apples, pears # and bananas\ngrapes\nbananas !apples", ["#", "!"])
// result should == "apples, pears\ngrapes\nbananas"

 

2. Solution

 

      

      

      

    
    

      <java />
    
import java.util.ArrayList;

public class StripComments {

	public static String stripComments(String text, String[] commentSymbols) {
		StringBuilder text1 = new StringBuilder();
		ArrayList<String> list = editString(text);
		for(String line:list) {
			text1.append(removeString(line, commentSymbols)).append("\n");
		}
		text1.deleteCharAt(text1.length()-1);
		if(SpaceAll(text1)) { return ""; }

		return text1.toString();
	}

	private static ArrayList<String> editString(String text) {
		StringBuilder text2 = new StringBuilder(text);
		ArrayList<String> result = new ArrayList<>();
		int index;
		for(int i=0; i<=result.size(); i++) {
			index = text2.indexOf("\n");
			if(index == -1) { break; }
			result.add(text2.substring(0, index));
			text2.delete(0, index+1);
		}
		result.add(text2.toString());
		System.out.println(result);
    
		return result;
	}
	
	
	private static Object removeString(String line, String[] commentSymbols) {
		StringBuilder result2 = new StringBuilder();
		char checkchar;
		boolean checking = true;
		
		for(int i=0; i<line.length(); i++) {
			checkchar = line.charAt(i);
			for(int j=0; j<commentSymbols.length; j++) {
				if( checkchar == commentSymbols[j].charAt(0)) {
					checking = false; 
					break;
					}
			}
			
			if(checking) { result2.append(checkchar); }
			else break;
		}
		
		if(result2.length() != 0 && result2.charAt(result2.length()-1) == ' ') {
			result2.deleteCharAt(result2.length()-1);
		}
		
		return result2;
	}
  
  private static boolean SpaceAll(StringBuilder text){
    int count = 0;
    for(int i=0; i<text.length(); i++){
      if(text.charAt(i) == ' ') { count++; }  
    }
    
    if(count==text.length()) { return true; }
    return false;
  }
	
}

빈 공간이 생기는 문제가 조금 귀찮았다

 

 

 

 

3.  

4. Best Solution

 

      

      

      

    
    

      <java />
    
import java.util.Arrays;
import java.util.stream.Collectors;

public class StripComments {
    public static String stripComments(String text, String[] symbols) {
        return Arrays.stream(text.split("\n")).map(s -> {
            for (String symbol : symbols) s = s.replaceAll("(\\s+$)|(\\s*[" + symbol + "].*)", "");
            return s;
        }).collect(Collectors.joining("\n"));
    }
}

: Stream과 정규 표현식을 이용해서 간단하게 해결함