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-rw-r--r--apps/advent2020/4a.mu75
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diff --git a/apps/advent2020/4a.mu b/apps/advent2020/4a.mu
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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/advent2020/4a.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 slice-storage: slice
-  var slice/edx: (addr slice) <- address 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: {
-      next-word line, slice
-      var done?/eax: boolean <- slice-empty? slice
-      compare done?, 0/false
-      break-if-!=
-      print-string 0, "  "
-      print-slice-to-real-screen slice
-      # treat cid as optional
-      var optional?/eax: boolean <- slice-starts-with? slice, "cid:"
-      compare optional?, 0/false
-      {
-        break-if-!=
-        # otherwise assume there are no invalid fields and no duplicate fields
-        curr-passport-field-count <- increment
-        print-string 0, " => "
-        print-int32-decimal 0, curr-passport-field-count
-      }
-      print-string 0, "\n"
-      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
-}