CSV Parser, Java - rextester

CSV Parser

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        // simple explaination of CSV format:
        // https://gpdb.docs.pivotal.io/43170/admin_guide/load/topics/g-escaping-in-csv-formatted-files.html
        //String s = "\"Free trip to A,B\",\"5.89\",\"Special rate \"\"1.79\"\"";
        String s = "\"Alexandra \"\"Al,ex\"\"\",Menendez,alex.menendez@gmail.com,Miami,1 \"\"\"Alexandra Alex\"\"\"";
        System.out.println(s);
        System.out.println(parseCSV(s));
    }
    
    //"Alexandra ""Alex""",Menendez,alex.menendez@gmail.com,Miami,1 """Alexandra Alex"""
    public static String parseCSV(String str) {
        int n = str.length();
        char[] s = str.toCharArray();
        StringBuilder sb = new StringBuilder();
        List<String> tokens = new ArrayList<>();
        boolean inQuote = false;
        for (int i = 0; i < n; i++) {
            if (s[i] == '"') {
                if (i + 1 < n && s[i + 1] == '"') {
                    sb.append('"');
                    i += 1;
                } else inQuote = !inQuote;
            } else if (s[i] == ',') {
                if (inQuote) sb.append(',');
                else {
                    tokens.add(sb.toString());
                    sb.setLength(0);
                }
            } else sb.append(s[i]);
        }
        if (sb.length() > 0) tokens.add(sb.toString());
        return String.join("|", tokens);
    }
}


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