1 files changed, 67 insertions, 0 deletions
diff --git a/2020/04/puzzle-2.awk b/2020/04/puzzle-2.awk
new file mode 100755
index 0000000..bb88145
--- /dev/null
+++ b/2020/04/puzzle-2.awk
@@ -0,0 +1,67 @@
+#!/usr/bin/env -S awk -f
+
+function between(x, l, h)
+{
+	return (x >= l) && (x <= h)
+}
+
+BEGIN {
+	eyecolor[1] = "amb"
+	eyecolor[2] = "blu"
+	eyecolor[3] = "brn"
+	eyecolor[4] = "gry"
+	eyecolor[5] = "grn"
+	eyecolor[6] = "hzl"
+	eyecolor[7] = "oth"
+}
+
+length == 0 {
+	valid = 1
+
+	if (!(between(fields["byr"], 1920, 2002) && between(fields["iyr"], 2010, 2020) &&
+			between(fields["eyr"], 2020, 2030) && length(fields["pid"]) == 9))
+		valid = 0
+	else {
+		# Test eyecolor
+		valid = 0
+		for (i in eyecolor) {
+			if (fields["ecl"] == eyecolor[i]) {
+				valid = 1
+				break
+			}
+		}
+
+		# Test height
+		split(fields["hgt"], height, "[^0-9]")
+		if ((fields["hgt"] ~ "cm" && !between(height[1], 150, 193)) ||
+				(fields["hgt"] ~ "in" && !between(height[1], 59, 76)) ||
+				(fields["hgt"] !~ "cm|in"))
+			valid = 0
+
+		# Test haircolor
+		if (fields["hcl"] !~ "^#[0-9a-f]{6}")
+			valid = 0
+	}
+
+	if (valid == 1)
+		count++
+
+	fields["byr"] = ""
+	fields["iyr"] = ""
+	fields["eyr"] = ""
+	fields["hgt"] = ""
+	fields["hcl"] = ""
+	fields["ecl"] = ""
+	fields["pid"] = ""
+	next
+}
+
+# Non-blank lines
+{
+	for (i = 1; i <= NF; i++) {
+		split($i, data, ":")
+		fields[data[1]] = data[2]
+	}
+}
+
+END { print count }