day4/count_valid_passports_2.sh

   1 #!/bin/bash
   2
   3 declare -a data
   4 cur_data=""
   5 seperator=""
   6 valid_count=0
   7
   8 required_fields=(byr iyr eyr hgt hcl ecl pid)
   9
  10 check_year() {
  11     value=$1
  12     min=$2
  13     max=$3
  14
  15     if [ $value -ge $min ] && [ $value -le $max ]; then
  16         exit 0
  17     fi
  18     exit 1
  19 }
  20
  21 check_height() {
  22     value=$1
  23     units=${value:$((${#value}-2)):2}
  24     value=${value:0:$((${#value}-2))}
  25     case $units in
  26         in)
  27             if [ $value -ge 59 ] && [ $value -le 76 ]; then
  28                 exit 0
  29             fi
  30             ;;
  31         cm)
  32             if [ $value -ge 150 ] && [ $value -le 193 ]; then
  33                 exit 0
  34             fi
  35             ;;
  36         *)
  37             ;;
  38     esac
  39     exit 1
  40 }
  41
  42 check_hair() {
  43     value=$1
  44
  45     if [ ${value:0:1} != "#" ]; then
  46         exit 1
  47     fi
  48
  49     if [[ $value =~ /^[a-f0-9]{6}$/ ]]; then
  50         exit 1
  51     fi
  52
  53     exit 0
  54 }
  55
  56 check_eyes() {
  57     colour="$1"
  58     case $colour in
  59         amb|blu|brn|gry|grn|hzl|oth)
  60             exit 0
  61             ;;
  62         *)
  63             exit 1
  64             ;;
  65     esac
  66     exit 1
  67 }
  68
  69 check_data() {
  70     local -n record=$1
  71     for x in ${!record[@]}; do
  72         value=${record[$x]}
  73         case $x in
  74             byr)
  75                 if ! ( check_year $value 1920 2002 ); then
  76                     exit 1
  77                 fi
  78                 ;;
  79             iyr)
  80                 if ! ( check_year $value 2010 2020 ); then
  81                     exit 1
  82                 fi
  83                 ;;
  84             eyr)
  85                 if ! ( check_year $value 2020 2030 ); then
  86                     exit 1
  87                 fi
  88                 ;;
  89             hgt)
  90                 if ! ( check_height $value ); then
  91                     exit 1
  92                 fi
  93                 ;;
  94             hcl)
  95                 if ! ( check_hair $value ); then
  96                     exit 1
  97                 fi
  98                 ;;
  99             ecl)
 100                 if ! ( check_eyes $value ); then
 101                     exit 1
 102                 fi
 103                 ;;
 104             pid)
 105                 value=${record[$x]}
 106                 if [ ${#value} -ne 9 ]; then
 107                     exit 1
 108                 fi
 109                 ;;
 110             *)
 111                 ;;
 112         esac
 113     done
 114
 115     exit 0
 116 }
 117
 118 exec 3<input.txt
 119
 120 while read -u 3 line; do
 121     if [ "$line" = "" ]; then
 122         data+=("$cur_data")
 123         seperator=""
 124         cur_data=""
 125         continue
 126     fi
 127     cur_data="${cur_data}${seperator}$line"
 128     seperator=" "
 129 done
 130
 131 check_fields() {
 132     local -n record=$1
 133     for field in ${required_fields[@]}; do
 134         if ! [ ${record[$field]+a} ]; then
 135             exit 1
 136         fi
 137     done
 138
 139     exit 0
 140 }
 141
 142 # on the last line, if cur_data isn't empty, add that to the array
 143 if [ "$cur_data" != "" ]; then
 144     data+=("$cur_data")
 145 fi
 146
 147 for (( i=0; i<${#data[@]}; i++ )); do
 148     record="${data[$i]}"
 149     declare -A kvp
 150     for field in $record; do
 151         key=${field%:*}
 152         value=${field#*:}
 153         kvp[$key]=$value
 154     done
 155     if ( check_fields kvp ); then
 156         if ( check_data kvp ); then
 157             valid_count=$((valid_count+1))
 158         fi
 159     fi
 160     unset kvp
 161 done
 162
 163 echo "$valid_count valid entries"