finished solution2

day04/solution02.rb

@@ -0,0 +1,79 @@
+#!/bin/env ruby
+
+def valid_passport? (passport, fields)
+    fields.each do |field|
+        return false if !(passport.has_key?(field.to_sym))
+    end
+    valid_colors = ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth']
+    passport.each_key do |key|
+        case key
+        when :byr
+            return false if (passport[key].to_i < 1920 or passport[key].to_i > 2002)
+        when :iyr
+            return false if (passport[key].to_i < 2010 or passport[key].to_i > 2020)
+        when :eyr
+            return false if (passport[key].to_i < 2020 or passport[key].to_i > 2030)
+        when :hgt
+            if passport[key][-2..] == 'in'
+                return false if (passport[key][..-3].to_i  < 59 or passport[key][..-3].to_i  > 76)
+            elsif passport[key][-2..] == 'cm'
+                return false if (passport[key][..-3].to_i  < 150 or passport[key][..-3].to_i  > 193)
+            else
+                return false
+            end
+        when :hcl
+            return false if !passport[key].match(/^[#][0-9a-f]{6}$/)
+        when :ecl
+            return false if !valid_colors.find { |color| color.match(passport[key]) }
+        when :pid
+            return false if !passport[key].match(/^[0-9]{9}$/)
+        end   
+    end             
+    true
+end
+
+text = File.read('./input')
+passports = Hash.new
+key = 0
+passport = Hash.new
+
+required_fields = [
+    "byr",
+    "iyr",
+    "eyr",
+    "hgt",
+    "hcl",
+    "ecl",
+    "pid",
+#    "cid"
+]
+
+results = {
+    :valid => 0,
+    :invalid => 0
+}
+
+text.each_line do |line|
+    line.strip!
+    if line == ''
+        passports[key] = passport
+        passport = Hash.new
+        key += 1
+        next
+    end
+    line.split(' ').each do |pair|
+        pair = pair.split(":")
+        passport[pair[0].to_sym] = pair[1]
+    end
+end
+passports[key] = passport
+
+passports.each_value do |passport|
+    if valid_passport?(passport, required_fields)
+        results[:valid] += 1
+    else
+        results[:invalid] += 1
+    end
+end
+
+pp results