# pike.git/lib/modules/Calendar.pmod/tzdata/zishrink.awk

Branch: Tag:

## 2019-02-06

#### 2019-02-06 22:17:42 by Henrik GrubbstrĂ¶m (Grubba) <grubba@grubba.org>

• 104d158d9214c352698d30cdbe827ddae62d37a0 (204 lines) (+184/-20) [ Show | Annotate ]
Branch: bill/debugger-concept
Updated to tzdata2018g.

6:   # '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.    - # Return a new rule name. - # N_RULE_NAMES keeps track of how many rule names have been generated. + function record_hash(n, name) + { +  if (used_hashes[n]) { +  printf "# ! collision: %s %s\n", used_hashes[n], name +  exit 1 +  } +  used_hashes[n] = name + }    - function gen_rule_name(alphabet, base, rule_name, n, digit) + # Return a shortened rule name representing NAME, + # and record this relationship to the hash table. +  + function gen_rule_name(name, n)   { -  alphabet = "" -  alphabet = alphabet "ABCDEFGHIJKLMNOPQRSTUVWXYZ" -  alphabet = alphabet "abcdefghijklmnopqrstuvwxyz" -  alphabet = alphabet "!\$%&'()*+,./:;<=>?@[\\]^_`{|}~" -  base = length(alphabet) -  rule_name = "" -  n = n_rule_names++ +  # 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 + }    -  do { -  n -= rule_name && n <= base -  digit = n % base -  rule_name = substr(alphabet, digit + 1, 1) rule_name -  n = (n - digit) / base -  } while (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.    -  return rule_name +  # 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 an input line and save it for later output.
106:    i = field[1] == "Z" ? 4 : field[1] == "Li" ? 0 : 2    if (i && field[i] ~ /^[^-+0-9]/) {    if (!rule[field[i]]) -  rule[field[i]] = gen_rule_name() +  rule[field[i]] = gen_rule_name(field[i])    field[i] = rule[field[i]]    }
144:   }      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 ]/ {