2020 Day 4 Complete

2020/day04/main.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"strconv"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	var passports []*Passport
+	var p *Passport
+	p, inp = GetFirstPassport(inp)
+	for p != nil {
+		passports = append(passports, p)
+		p, inp = GetFirstPassport(inp)
+	}
+	var valid int
+	for _, t := range passports {
+		if t.IsValid() {
+			valid++
+		}
+	}
+	fmt.Printf("%d Valid Passports\n", valid)
+}
+
+type Passport struct {
+	BirthYear  string
+	IssueYear  string
+	Expiration string
+	Height     string
+	HairColor  string
+	EyeColor   string
+	PassportID string
+	CountryID  string
+}
+
+func GetFirstPassport(input []string) (*Passport, []string) {
+	ret := Passport{}
+	var k int
+	for k = range input {
+		if strings.TrimSpace(input[k]) == "" {
+			break
+		}
+		pts := strings.Split(input[k], " ")
+		for pk := range pts {
+			keyval := strings.Split(pts[pk], ":")
+			if len(keyval) == 2 {
+				switch keyval[0] {
+				case "byr":
+					ret.BirthYear = keyval[1]
+				case "iyr":
+					ret.IssueYear = keyval[1]
+				case "eyr":
+					ret.Expiration = keyval[1]
+				case "hgt":
+					ret.Height = keyval[1]
+				case "hcl":
+					ret.HairColor = keyval[1]
+				case "ecl":
+					ret.EyeColor = keyval[1]
+				case "pid":
+					ret.PassportID = keyval[1]
+				case "cid":
+					ret.CountryID = keyval[1]
+				}
+			}
+		}
+	}
+	if k == 0 {
+		return nil, []string{}
+	}
+	return &ret, input[k+1:]
+}
+
+func (p *Passport) ValidBirthYear() bool {
+	wrk, err := strconv.Atoi(p.BirthYear)
+	return err == nil && wrk >= 1920 && wrk <= 2002
+}
+
+func (p *Passport) ValidIssueYear() bool {
+	wrk, err := strconv.Atoi(p.IssueYear)
+	return err == nil && wrk >= 2010 && wrk <= 2020
+}
+
+func (p *Passport) ValidExpiration() bool {
+	wrk, err := strconv.Atoi(p.Expiration)
+	return err == nil && wrk >= 2020 && wrk <= 2030
+}
+
+func (p *Passport) ValidHeight() bool {
+	if strings.Contains(p.Height, "in") {
+		wrk, err := strconv.Atoi(strings.TrimSuffix(p.Height, "in"))
+		return err == nil && wrk >= 59 && wrk <= 76
+	} else if strings.Contains(p.Height, "cm") {
+		wrk, err := strconv.Atoi(strings.TrimSuffix(p.Height, "cm"))
+		return err == nil && wrk >= 150 && wrk <= 193
+	}
+	return false
+}
+
+func (p *Passport) ValidHairColor() bool {
+	if !strings.HasPrefix(p.HairColor, "#") {
+		return false
+	}
+	_, err := hex.DecodeString(p.HairColor[1:])
+	return err == nil
+}
+
+func (p *Passport) ValidEyeColor() bool {
+	return p.EyeColor == "amb" || p.EyeColor == "blu" || p.EyeColor == "brn" || p.EyeColor == "gry" || p.EyeColor == "grn" || p.EyeColor == "hzl" || p.EyeColor == "oth"
+}
+
+func (p *Passport) ValidPassportID() bool {
+	_, err := strconv.Atoi(p.PassportID)
+	return err == nil && len(p.PassportID) == 9
+}
+
+func (p *Passport) IsValid() bool {
+	return p.ValidBirthYear() && p.ValidIssueYear() && p.ValidExpiration() && p.ValidHeight() && p.ValidHairColor() && p.ValidEyeColor() && p.ValidPassportID()
+}

2020/day04/testinput

@@ -0,0 +1,13 @@
+ecl:gry pid:860033327 eyr:2020 hcl:#fffffd
+byr:1937 iyr:2017 cid:147 hgt:183cm
+
+iyr:2013 ecl:amb cid:350 eyr:2023 pid:028048884
+hcl:#cfa07d byr:1929
+
+hcl:#ae17e1 iyr:2013
+eyr:2024
+ecl:brn pid:760753108 byr:1931
+hgt:179cm
+
+hcl:#cfa07d eyr:2025 pid:166559648
+iyr:2011 ecl:brn hgt:59in