homework

package inputSanitation;

import java.util.ArrayList;

public class sanitizer {

	

	public void isSafe(String s) {
		s = s.toLowerCase();
		if(sqlCheck(s) || unbalancedQuote(s)) {
			System.out.print("No");
		}
		
	}
	
	
	public boolean balancedPar(String string) {
		
		Stack s = new Stack();
		char[] splitted = string.toCharArray();
		char[] paren;
		
		
		
		
		boolean balanced = true;
		int index = 0;
		while(index < splitted.length && balanced) {
			
			
			
			
		}
		return false;
	}
	
	private char[] paren(char[] string) {
		char[] paren; 
		for(char c:string) {
			//if // I am here
		}
		
		
		return null;
	}
	
	
	public boolean sqlCheck(String s) {
		
		String[] splitted = s.split("\\s+");
		
		boolean isSelect = false;
		boolean isWhere = false;
		
		for(String c:splitted) {
			if(c.equals("select")) {
				isSelect = true;
			}	
			if(c.equals("where")) {
				isWhere = true;
			}
		}
		if(isSelect == true && isWhere == true) {
			//System.out.print("contains sql");
			return true;
		}
		return false;
	}
	
	public boolean unbalancedQuote(String s) {
		
		char[] splitted = s.toCharArray();
		
		int counter1=0;
		int counter2=0;
		
		for(char c:splitted) {
		
			if(c == '\'') {
				counter1++;
			}
			
			else if(c == '"') {
				counter2++;
			}
			
		}
		
		if(counter1%2==0 && counter2%2==0) {
			return false;
		}
		
		return true;
	}
	
}

class Stack {
	
	ArrayList<Character> items;
	
	public Stack() {
		items = new ArrayList<Character>();
	}
	
	public void push(char c) {
		items.add(c);
	}
	
	public char pop() {
		return items.remove(items.size()-1);
	}
	
	public boolean isEmpty() {
		
		if(items.size()==0) {
			return true;
		}
		
		return false;
	}
}