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# https://adventofcode.com/2020/day/4
#
# To run (on Linux):
# $ git clone https://github.com/akkartik/mu
# $ cd mu
# $ ./translate_mu apps/advent2020/4b.mu
# $ ./a.elf < input
#
# You'll need to register to download the 'input' file for yourself.
fn main -> _/ebx: int {
var curr-passport-field-count/esi: int <- copy 0
var valid-passport-count/edi: int <- copy 0
var line-storage: (stream byte 0x100) # 256 bytes
var line/ecx: (addr stream byte) <- address line-storage
var key-slice-storage: slice
var key-slice/edx: (addr slice) <- address key-slice-storage
var val-slice-storage: slice
var val-slice/ebx: (addr slice) <- address val-slice-storage
$main:line-loop: {
# read line from stdin
clear-stream line
read-line-from-real-keyboard line
# if line is empty (not even a newline), quit
var done?/eax: boolean <- stream-empty? line
compare done?, 0 # false
break-if-!=
print-stream-to-real-screen line
# if line has just a newline, process passport
skip-chars-matching-whitespace line
var new-passport?/eax: boolean <- stream-empty? line
{
compare new-passport?, 0 # false
break-if-=
compare curr-passport-field-count, 7
{
break-if-!=
valid-passport-count <- increment
print-string 0, "=> "
print-int32-decimal 0, valid-passport-count
print-string 0, "\n"
}
curr-passport-field-count <- copy 0
loop $main:line-loop
}
$main:word-loop: {
skip-chars-matching-whitespace line
var done?/eax: boolean <- stream-empty? line
compare done?, 0 # false
break-if-!=
next-token line, 0x3a, key-slice # ':'
var dummy/eax: byte <- read-byte line # skip ':'
next-raw-word line, val-slice
print-slice-to-real-screen key-slice
print-string 0, " : "
print-slice-to-real-screen val-slice
print-string 0, "\n"
# treat cid as optional
var cid?/eax: boolean <- slice-equal? key-slice, "cid"
compare cid?, 0 # false
loop-if-!=
# increment field count
curr-passport-field-count <- increment
# - validate fields one by one, setting curr-passport-field-count to impossibly high value to signal invalid
# byr
{
var byr?/eax: boolean <- slice-equal? key-slice, "byr"
compare byr?, 0 # false
break-if-=
# 1920 <= byr <= 2002
var byr/eax: int <- parse-decimal-int-from-slice val-slice
compare byr, 0x780 # 1920
{
break-if->=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
compare byr, 0x7d2 # 2002
{
break-if-<=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
}
# iyr
{
var iyr?/eax: boolean <- slice-equal? key-slice, "iyr"
compare iyr?, 0 # false
break-if-=
# 2010 <= iyr <= 2020
var iyr/eax: int <- parse-decimal-int-from-slice val-slice
compare iyr, 0x7da # 2010
{
break-if->=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
compare iyr, 0x7e4 # 2020
{
break-if-<=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
}
# eyr
{
var eyr?/eax: boolean <- slice-equal? key-slice, "eyr"
compare eyr?, 0 # false
break-if-=
# 2020 <= eyr <= 2030
var eyr/eax: int <- parse-decimal-int-from-slice val-slice
compare eyr, 0x7e4 # 2020
{
break-if->=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
compare eyr, 0x7ee # 2030
{
break-if-<=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
}
# hgt
{
var hgt?/eax: boolean <- slice-equal? key-slice, "hgt"
compare hgt?, 0 # false
break-if-=
# convert val
var s: (handle array byte)
var s2/eax: (addr handle array byte) <- address s
_slice-to-string val-slice, s2
var s3/eax: (addr array byte) <- lookup *s2
var s4/ebx: (addr array byte) <- copy s3
# check suffix
var start/edx: int <- length s4
start <- subtract 2 # luckily both 'in' and 'cm' have the same length
{
var suffix-h: (handle array byte)
var suffix-ah/ecx: (addr handle array byte) <- address suffix-h
substring s4, start, 2, suffix-ah
var suffix/eax: (addr array byte) <- lookup *suffix-ah
{
var match?/eax: boolean <- string-equal? suffix, "in"
compare match?, 0 # false
break-if-=
# if suffix is "in", 59 <= val <= 96
var num-h: (handle array byte)
var num-ah/ecx: (addr handle array byte) <- address num-h
substring s4, 0, start, num-ah
var num/eax: (addr array byte) <- lookup *num-ah
var val/eax: int <- parse-decimal-int num
compare val, 0x3b # 59
{
break-if->=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
compare val, 0x60 # 96
{
break-if-<=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
loop $main:word-loop
}
{
var match?/eax: boolean <- string-equal? suffix, "cm"
compare match?, 0 # false
break-if-=
# if suffix is "cm", 150 <= val <= 193
var num-h: (handle array byte)
var num-ah/ecx: (addr handle array byte) <- address num-h
substring s4, 0, start, num-ah
var num/eax: (addr array byte) <- lookup *num-ah
var val/eax: int <- parse-decimal-int num
compare val, 0x96 # 150
{
break-if->=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
compare val, 0xc1 # 193
{
break-if-<=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
loop $main:word-loop
}
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
loop $main:word-loop
}
}
# hcl
{
var hcl?/eax: boolean <- slice-equal? key-slice, "hcl"
compare hcl?, 0 # false
break-if-=
# convert val
var s: (handle array byte)
var s2/eax: (addr handle array byte) <- address s
_slice-to-string val-slice, s2
var s3/eax: (addr array byte) <- lookup *s2
# check length
var len/ebx: int <- length s3
compare len, 7
{
break-if-=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
loop $main:word-loop
}
# check first byte
{
var c/eax: (addr byte) <- index s3, 0
var c2/eax: byte <- copy-byte *c
compare c2, 0x23 # '#'
break-if-=
print-string 0, "invalid2\n"
curr-passport-field-count <- copy 8
loop $main:word-loop
}
# check remaining bytes
var i/ebx: int <- copy 1 # skip 0
{
compare i, 7
break-if->=
var c/eax: (addr byte) <- index s3, i
{
var c2/eax: byte <- copy-byte *c
var valid?/eax: boolean <- is-hex-digit? c2
compare valid?, 0
loop-if-= $main:word-loop
}
i <- increment
loop
}
}
# ecl
{
var ecl?/eax: boolean <- slice-equal? key-slice, "ecl"
compare ecl?, 0 # false
break-if-=
var amb?/eax: boolean <- slice-equal? val-slice, "amb"
compare amb?, 0 # false
loop-if-!= $main:word-loop
var blu?/eax: boolean <- slice-equal? val-slice, "blu"
compare blu?, 0 # false
loop-if-!= $main:word-loop
var brn?/eax: boolean <- slice-equal? val-slice, "brn"
compare brn?, 0 # false
loop-if-!= $main:word-loop
var gry?/eax: boolean <- slice-equal? val-slice, "gry"
compare gry?, 0 # false
loop-if-!= $main:word-loop
var grn?/eax: boolean <- slice-equal? val-slice, "grn"
compare grn?, 0 # false
loop-if-!= $main:word-loop
var hzl?/eax: boolean <- slice-equal? val-slice, "hzl"
compare hzl?, 0 # false
loop-if-!= $main:word-loop
var oth?/eax: boolean <- slice-equal? val-slice, "oth"
compare oth?, 0 # false
loop-if-!= $main:word-loop
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
# pid
{
var pid?/eax: boolean <- slice-equal? key-slice, "pid"
compare pid?, 0 # false
break-if-=
# convert val
var s: (handle array byte)
var s2/eax: (addr handle array byte) <- address s
_slice-to-string val-slice, s2
var s3/eax: (addr array byte) <- lookup *s2
# check length
var len/eax: int <- length s3
compare len, 9
{
break-if-=
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
loop $main:word-loop
}
# check valid decimal int
# parse-decimal-int-from-slice currently returns 0 on invalid parse,
# which isn't ideal but suffices for our purposes
var val/eax: int <- parse-decimal-int-from-slice val-slice
compare val, 0
{
break-if->
print-string 0, "invalid\n"
curr-passport-field-count <- copy 8
}
}
loop
}
loop
}
# process final passport
compare curr-passport-field-count, 7
{
break-if-!=
valid-passport-count <- increment
}
print-int32-decimal 0, valid-passport-count
print-string 0, "\n"
return 0
}
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