parenthesis_validator_spec.rb

require "minitest/autorun"
require "minitest/pride"

module ParenthesisValidator
  extend self
  OPENERS = %w|( { [|

  def call(code)
    return false if code.size == 1
    openers = []
    0.upto(code.size-1).each do |idx|
      if OPENERS.include?(code[idx])
        openers << code[idx]
      else
        return false if openers.empty?
        return false if openers.pop == code[idx]
      end
    end
    true
  end

end

describe ParenthesisValidator do
  it "returns true for empty string" do
    # ParenthesisValidator.("").must_equal true
  end

  it "returns false for one opening (" do
    # ParenthesisValidator.("(").must_equal false
  end

  it "returns false for one closing )" do
    # ParenthesisValidator.(")").must_equal false
  end

  it "returns true for open and closing ()" do
    # ParenthesisValidator.("()").must_equal true
  end

  it "returns false for ())" do
    # ParenthesisValidator.("())").must_equal false
    ParenthesisValidator.("{[(])}]}").must_equal false
  end
end