We golfing now

2020/src/day4.nim

@@ -1,54 +1,28 @@
 import streams, strutils, sets, sequtils, sugar, re, tables
 
-proc matchingHeightRange(v: string): (int, int) =
-  if v.endsWith("cm"): return (150, 193)
-  elif v.endsWith("in"): return (59, 76)
-
-proc isBetween(x: int, r: (int, int)): bool = x >= r[0] and x <= r[1]
-proc validBirthYear(y: int): bool = y >= 1920 and y <= 2002
-proc validIssuedYear(y: int): bool = y >= 2010 and y <= 2020
-proc validExpiryYear(y: int): bool = y >= 2020 and y <= 2030
-
-let nonDecimal = re"[^0-9]"
-let hgt = re"\d+(cm|in)"
-let hcl = re"#[0-9a-f]{6}"
-let ecl = re"(amb|blu|brn|gry|grn|hzl|oth)"
-let pid = re"^\d{9}$"
-
-let validators = {
-  "hgt": (v: string) =>
-    v.match(hgt) and
-      v.replace(nonDecimal).parseInt().isBetween(v.matchingHeightRange),
-  "hcl": (v: string) => v.match hcl,
-  "ecl": (v: string) => v.match ecl,
-  "pid": (v: string) => v.match pid,
-  "byr": (v: string) => validBirthYear parseInt v,
-  "iyr": (v: string) => validIssuedYear parseInt v,
-  "eyr": (v: string) => validExpiryYear parseInt v,
+let validators = toTable({
+  "hcl": (v: string) => v.match re"^#[0-9a-f]{6}$",
+  "ecl": (v: string) => v.match re"^(amb|blu|brn|gry|grn|hzl|oth)$",
+  "pid": (v: string) => v.match re"^\d{9}$",
+  "byr": (v: string) => parseInt(v) in 1920..2002,
+  "iyr": (v: string) => parseInt(v) in 2010..2020,
+  "eyr": (v: string) => parseInt(v) in 2020..2030,
+  "hgt": proc (v: string): bool =
+    let (mn, mx) = if v.endsWith("cm"): (150, 193) else: (59, 76)
+    v.match(re"^\d+(cm|in)$") and v.replace(re"[^0-9]").parseInt in mn..mx,
   "cid": (v: string) => true,
-}.toTable
+})
 
-proc passportTable(passport: string): Table[string, string] =
-  passport.split(' ').filterIt(it != "").mapIt(it.split(':', 2)).mapIt((it[0], it[1])).toTable
-
-iterator asPassports(s: Stream): Table[string, string] =
-  var p = ""
-  for l in s.lines:
-    p &= l & " "
-    if l == "" or s.atEnd:
-      yield p.passportTable
-      p = ""
+proc parsePassports(s: Stream): seq[Table[string, string]] =
+  s.readAll().split("\n\n").mapIt(it.replace("\n", " ").split(' ')
+    .filterIt(it != "").mapIt(it.split(':', 2)).mapIt((it[0], it[1])).toTable)
 
 proc hasRequiredFields(p: Table[string, string]): bool =
-  let optionalFields = ["cid"].toHashSet()
-  toSeq(p.keys).toHashSet.difference(optionalFields) ==
-    toSeq(validators.keys).toHashSet.difference(optionalFields)
-
-proc isValid(p: Table[string, string]): bool =
-  toSeq(p.pairs).mapIt(validators[it[0]](it[1])).foldl(a and b)
+  toSeq(validators.keys).toHashSet.difference(["cid"].toHashSet) <= toSeq(p.keys).toHashSet
 
 proc part1*(s: Stream): int =
-  toSeq(s.asPassports).filterIt(it.hasRequiredFields).len
+  s.parsePassports.filterIt(it.hasRequiredFields).len
 
 proc part2*(s: Stream): int =
-  toSeq(s.asPassports).filterIt(it.hasRequiredFields and it.isValid).len
+  s.parsePassports.filterIt(it.hasRequiredFields and
+    toSeq(it.pairs).mapIt(validators[it[0]](it[1])).foldl(a and b)).len