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# Convert tzdata source into a smaller version of itself. 
 
# Contributed by Paul Eggert.  This file is in the public domain. 
 
# This is not a general-purpose converter; it is designed for current tzdata. 
# 'zic' should treat this script's output as if it were identical to 
# this script's input. 
 
# Record a hash N for the new name NAME, checking for collisions. 
 
function record_hash(n, name) 
{ 
  if (used_hashes[n]) { 
    printf "# ! collision: %s %s\n", used_hashes[n], name 
    exit 1 
  } 
  used_hashes[n] = name 
} 
 
# Return a shortened rule name representing NAME, 
# and record this relationship to the hash table. 
 
function gen_rule_name(name, \ 
                       n) 
{ 
  # Use a simple memonic: the first two letters. 
  n = substr(name, 1, 2) 
  record_hash(n, name) 
  # printf "# %s = %s\n", n, name 
  return n 
} 
 
function prehash_rule_names( \ 
                            name) 
{ 
  # Rule names are not part of the tzdb API, so substitute shorter 
  # ones.  Shortening them consistently from one release to the next 
  # simplifies comparison of the output.  That being said, the 
  # 1-letter names below are not standardized in any way, and can 
  # change arbitrarily from one release to the next, as the main goal 
  # here is compression not comparison. 
 
  # Abbreviating these rules names to one letter saved the most space 
  # circa 2018e. 
  rule["Arg"] = "A" 
  rule["Brazil"] = "B" 
  rule["Canada"] = "C" 
  rule["Denmark"] = "D" 
  rule["EU"] = "E" 
  rule["France"] = "F" 
  rule["GB-Eire"] = "G" 
  rule["Halifax"] = "H" 
  rule["Italy"] = "I" 
  rule["Jordan"] = "J" 
  rule["Egypt"] = "K" # "Kemet" in ancient Egyptian 
  rule["Libya"] = "L" 
  rule["Morocco"] = "M" 
  rule["Neth"] = "N" 
  rule["Poland"] = "O" # arbitrary 
  rule["Palestine"] = "P" 
  rule["Cuba"] = "Q" # Its start sounds like "Q". 
  rule["Russia"] = "R" 
  rule["Syria"] = "S" 
  rule["Turkey"] = "T" 
  rule["Uruguay"] = "U" 
  rule["Vincennes"] = "V" 
  rule["Winn"] = "W" 
  rule["Mongol"] = "X" # arbitrary 
  rule["NT_YK"] = "Y" 
  rule["Zion"] = "Z" 
  rule["Austria"] = "a" 
  rule["Belgium"] = "b" 
  rule["C-Eur"] = "c" 
  rule["Algeria"] = "d" # country code DZ 
  rule["E-Eur"] = "e" 
  rule["Taiwan"] = "f" # Formosa 
  rule["Greece"] = "g" 
  rule["Hungary"] = "h" 
  rule["Iran"] = "i" 
  rule["StJohns"] = "j" 
  rule["Chatham"] = "k" # arbitrary 
  rule["Lebanon"] = "l" 
  rule["Mexico"] = "m" 
  rule["Tunisia"] = "n" # country code TN 
  rule["Moncton"] = "o" # arbitrary 
  rule["Port"] = "p" 
  rule["Albania"] = "q" # arbitrary 
  rule["Regina"] = "r" 
  rule["Spain"] = "s" 
  rule["Toronto"] = "t" 
  rule["US"] = "u" 
  rule["Louisville"] = "v" # ville 
  rule["Iceland"] = "w" # arbitrary 
  rule["Chile"] = "x" # arbitrary 
  rule["Para"] = "y" # country code PY 
  rule["Romania"] = "z" # arbitrary 
  rule["Macau"] = "_" # arbitrary 
 
  # Use ISO 3166 alpha-2 country codes for remaining names that are countries. 
  # This is more systematic, and avoids collisions (e.g., Malta and Moldova). 
  rule["Armenia"] = "AM" 
  rule["Aus"] = "AU" 
  rule["Azer"] = "AZ" 
  rule["Barb"] = "BB" 
  rule["Dhaka"] = "BD" 
  rule["Bulg"] = "BG" 
  rule["Bahamas"] = "BS" 
  rule["Belize"] = "BZ" 
  rule["Swiss"] = "CH" 
  rule["Cook"] = "CK" 
  rule["PRC"] = "CN" 
  rule["Cyprus"] = "CY" 
  rule["Czech"] = "CZ" 
  rule["Germany"] = "DE" 
  rule["DR"] = "DO" 
  rule["Ecuador"] = "EC" 
  rule["Finland"] = "FI" 
  rule["Fiji"] = "FJ" 
  rule["Falk"] = "FK" 
  rule["Ghana"] = "GH" 
  rule["Guat"] = "GT" 
  rule["Hond"] = "HN" 
  rule["Haiti"] = "HT" 
  rule["Eire"] = "IE" 
  rule["Iraq"] = "IQ" 
  rule["Japan"] = "JP" 
  rule["Kyrgyz"] = "KG" 
  rule["ROK"] = "KR" 
  rule["Latvia"] = "LV" 
  rule["Lux"] = "LX" 
  rule["Moldova"] = "MD" 
  rule["Malta"] = "MT" 
  rule["Mauritius"] = "MU" 
  rule["Namibia"] = "NA" 
  rule["Nic"] = "NI" 
  rule["Norway"] = "NO" 
  rule["Peru"] = "PE" 
  rule["Phil"] = "PH" 
  rule["Pakistan"] = "PK" 
  rule["Sudan"] = "SD" 
  rule["Salv"] = "SV" 
  rule["Tonga"] = "TO" 
  rule["Vanuatu"] = "VU" 
 
  # Avoid collisions. 
  rule["Detroit"] = "Dt" # De = Denver 
 
  for (name in rule) { 
    record_hash(rule[name], name) 
  } 
} 
 
# Process the input line LINE and save it for later output. 
 
function process_input_line(line, \ 
                            field, end, i, n, startdef, \ 
                            linkline, ruleline, zoneline) 
{ 
  # Remove comments, normalize spaces, and append a space to each line. 
  sub(/#.*/, "", line) 
  line = line " " 
  gsub(/[\t ]+/, " ", line) 
 
  # Abbreviate keywords and determine line type. 
  linkline = sub(/^Link /, "L ", line) 
  ruleline = sub(/^Rule /, "R ", line) 
  zoneline = sub(/^Zone /, "Z ", line) 
 
  # SystemV rules are not needed. 
  if (line ~ /^R SystemV /) return 
 
  # Replace FooAsia rules with the same rules without "Asia", as they 
  # are duplicates. 
  if (match(line, /[^ ]Asia /)) { 
    if (ruleline) return 
    line = substr(line, 1, RSTART) substr(line, RSTART + 5) 
  } 
 
  # Abbreviate times. 
  while (match(line, /[: ]0+[0-9]/)) 
    line = substr(line, 1, RSTART) substr(line, RSTART + RLENGTH - 1) 
  while (match(line, /:0[^:]/)) 
    line = substr(line, 1, RSTART - 1) substr(line, RSTART + 2) 
 
  # Abbreviate weekday names. 
  while (match(line, / (last)?(Mon|Wed|Fri)[ <>]/)) { 
    end = RSTART + RLENGTH 
    line = substr(line, 1, end - 4) substr(line, end - 1) 
  } 
  while (match(line, / (last)?(Sun|Tue|Thu|Sat)[ <>]/)) { 
    end = RSTART + RLENGTH 
    line = substr(line, 1, end - 3) substr(line, end - 1) 
  } 
 
  # Abbreviate "max", "min", "only" and month names. 
  gsub(/ max /, " ma ", line) 
  gsub(/ min /, " mi ", line) 
  gsub(/ only /, " o ", line) 
  gsub(/ Jan /, " Ja ", line) 
  gsub(/ Feb /, " F ", line) 
  gsub(/ Apr /, " Ap ", line) 
  gsub(/ Aug /, " Au ", line) 
  gsub(/ Sep /, " S ", line) 
  gsub(/ Oct /, " O ", line) 
  gsub(/ Nov /, " N ", line) 
  gsub(/ Dec /, " D ", line) 
 
  # Strip leading and trailing space. 
  sub(/^ /, "", line) 
  sub(/ $/, "", line) 
 
  # Remove unnecessary trailing zero fields. 
  sub(/ 0+$/, "", line) 
 
  # Remove unnecessary trailing days-of-month "1". 
  if (match(line, /[A-Za-z] 1$/)) 
    line = substr(line, 1, RSTART) 
 
  # Remove unnecessary trailing " Ja" (for January). 
  sub(/ Ja$/, "", line) 
 
  n = split(line, field) 
 
  # Abbreviate rule names. 
  i = zoneline ? 4 : linkline ? 0 : 2 
  if (i && field[i] ~ /^[^-+0-9]/) { 
    if (!rule[field[i]]) 
      rule[field[i]] = gen_rule_name(field[i]) 
    field[i] = rule[field[i]] 
  } 
 
  # If this zone supersedes an earlier one, delete the earlier one 
  # from the saved output lines. 
  startdef = "" 
  if (zoneline) 
    zonename = startdef = field[2] 
  else if (linkline) 
    zonename = startdef = field[3] 
  else if (ruleline) 
    zonename = "" 
  if (startdef) { 
    i = zonedef[startdef] 
    if (i) { 
      do 
        output_line[i - 1] = "" 
      while (output_line[i++] ~ /^[-+0-9]/); 
    } 
  } 
  zonedef[zonename] = nout + 1 
 
  # Save the line for later output. 
  line = field[1] 
  for (i = 2; i <= n; i++) 
    line = line " " field[i] 
  output_line[nout++] = line 
} 
 
function output_saved_lines( \ 
                            i) 
{ 
  for (i = 0; i < nout; i++) 
    if (output_line[i]) 
      print output_line[i] 
} 
 
BEGIN { 
  # Files that the output normally depends on. 
  default_dep["africa"] = 1 
  default_dep["antarctica"] = 1 
  default_dep["asia"] = 1 
  default_dep["australasia"] = 1 
  default_dep["backward"] = 1 
  default_dep["etcetera"] = 1 
  default_dep["europe"] = 1 
  default_dep["factory"] = 1 
  default_dep["northamerica"] = 1 
  default_dep["southamerica"] = 1 
  default_dep["systemv"] = 1 
  default_dep["ziguard.awk"] = 1 
  default_dep["zishrink.awk"] = 1 
 
  # Output a version string from 'version' and related configuration variables 
  # supported by tzdb's Makefile.  If you change the makefile or any other files 
  # that affect the output of this script, you should append '-SOMETHING' 
  # to the contents of 'version', where SOMETHING identifies what was changed. 
 
  ndeps = split(deps, dep) 
  ddeps = "" 
  for (i = 1; i <= ndeps; i++) { 
    if (default_dep[dep[i]]) { 
      default_dep[dep[i]]++ 
    } else { 
      ddeps = ddeps " " dep[i] 
    } 
  } 
  for (d in default_dep) { 
    if (default_dep[d] == 1) { 
      ddeps = ddeps " !" d 
    } 
  } 
  print "# version", version 
  if (dataform != "main") { 
    print "# dataform", dataform 
  } 
  if (redo != "posix_right") { 
    print "# redo " redo 
  } 
  if (ddeps) { 
    print "# ddeps" ddeps 
  } 
  print "# This zic input file is in the public domain." 
 
  prehash_rule_names() 
} 
 
/^[\t ]*[^#\t ]/ { 
  process_input_line($0) 
} 
 
END { 
  output_saved_lines() 
}