Test

balanced_brakets.rb

TESTE_DATA = [
  ["(a[0]+b[2c[6]]) {24 + 53}", true],
  ["f(e(d))", true],
  ["[()]{}([])", true],
  ["((b)", false],
  ["(c]", false],
  ["{(a[])", false],
  ["([)]", false],
  [")(", false],
  ["", false],
]

#) ## ["(", "[", "[", "["] ==> [ -> (


OPEN_SYMBOLS = ['(', '{', '[']
CLOSE_SYMBOLS = [')', '}', ']']

def brackward_of(symbol)
  OPEN_SYMBOLS[CLOSE_SYMBOLS.index(symbol)]
end

def brakets_closed?(text)
  brakets = []

  text.split('').each do |char|
    brakets << char if OPEN_SYMBOLS.include?(char)

    if CLOSE_SYMBOLS.include?(char)
      open_equivalent = brackward_of(char)
      if brakets[brakets.length - 1] == open_equivalent
        brakets.slice!(-1)
      else
        return false
      end
    end
  end

  return false if !brakets.empty? || text.empty?

  true
end

TESTE_DATA.each do |test|
  puts brakets_closed?(test[0]) == test[1] ? "CORRECT" : "FAIL"
end