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387 lines
12 KiB
Awk
387 lines
12 KiB
Awk
# Convert tzdata source into vanguard or rearguard form.
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# Contributed by Paul Eggert. This file is in the public domain.
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# This is not a general-purpose converter; it is designed for current tzdata.
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# It just converts from current source to main, vanguard, and rearguard forms.
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# Although it might be nice for it to be idempotent, or to be useful
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# for converting back and forth between vanguard and rearguard formats,
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# it does not do these nonessential tasks now.
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#
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# Although main and vanguard forms are currently equivalent,
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# this need not always be the case. When the two forms differ,
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# this script can convert either from main to vanguard form (needed then),
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# or from vanguard to main form (this conversion would be needed later,
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# after main became rearguard and vanguard became main).
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# There is no need to convert rearguard to other forms.
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#
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# When converting to vanguard form, the output can use the line
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# "Zone GMT 0 - GMT" which TZUpdater 2.3.2 mistakenly rejects.
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#
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# When converting to vanguard form, the output can use negative SAVE
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# values.
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#
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# When converting to rearguard form, the output uses only nonnegative
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# SAVE values. The idea is for the output data to simulate the behavior
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# of the input data as best it can within the constraints of the
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# rearguard format.
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# Given a FIELD like "-0:30", return a minute count like -30.
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function get_minutes(field, \
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sign, hours, minutes)
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{
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sign = field ~ /^-/ ? -1 : 1
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hours = +field
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if (field ~ /:/) {
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minutes = field
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sub(/[^:]*:/, "", minutes)
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}
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return 60 * hours + sign * minutes
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}
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# Given an OFFSET, which is a minute count like 300 or 330,
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# return a %z-style abbreviation like "+05" or "+0530".
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function offset_abbr(offset, \
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hours, minutes, sign)
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{
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hours = int(offset / 60)
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minutes = offset % 60
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if (minutes) {
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return sprintf("%+.4d", hours * 100 + minutes);
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} else {
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return sprintf("%+.2d", hours)
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}
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}
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# Round TIMESTAMP (a +-hh:mm:ss.dddd string) to the nearest second.
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function round_to_second(timestamp, \
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hh, mm, ss, seconds, dot_dddd, subseconds)
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{
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dot_dddd = timestamp
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if (!sub(/^[+-]?[0-9]+:[0-9]+:[0-9]+\./, ".", dot_dddd))
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return timestamp
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hh = mm = ss = timestamp
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sub(/^[-+]?[0-9]+:[0-9]+:/, "", ss)
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sub(/^[-+]?[0-9]+:/, "", mm)
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sub(/^[-+]?/, "", hh)
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seconds = 3600 * hh + 60 * mm + ss
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subseconds = +dot_dddd
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seconds += 0.5 < subseconds || ((subseconds == 0.5) && (seconds % 2));
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return sprintf("%s%d:%.2d:%.2d", timestamp ~ /^-/ ? "-" : "", \
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seconds / 3600, seconds / 60 % 60, seconds % 60)
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}
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BEGIN {
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dataform_type["vanguard"] = 1
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dataform_type["main"] = 1
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dataform_type["rearguard"] = 1
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if (PACKRATLIST) {
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while (getline <PACKRATLIST) {
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if ($0 ~ /^#/) continue
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packratlist[$3] = 1
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}
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}
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# The command line should set DATAFORM.
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if (!dataform_type[DATAFORM]) exit 1
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}
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$1 == "#PACKRATLIST" && $2 == PACKRATLIST {
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sub(/^#PACKRATLIST[\t ]+[^\t ]+[\t ]+/, "")
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}
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/^Zone/ { zone = $2 }
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DATAFORM != "main" {
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in_comment = $0 ~ /^#/
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uncomment = comment_out = 0
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# If this line should differ due to Czechoslovakia using negative SAVE values,
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# uncomment the desired version and comment out the undesired one.
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if (zone == "Europe/Prague" && $0 ~ /^#?[\t ]+[01]:00[\t ]/ \
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&& $0 ~ /1947 Feb 23/) {
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if (($(in_comment + 2) != "-") == (DATAFORM != "rearguard")) {
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uncomment = in_comment
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} else {
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comment_out = !in_comment
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}
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}
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# If this line should differ due to Ireland using negative SAVE values,
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# uncomment the desired version and comment out the undesired one.
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Rule_Eire = $0 ~ /^#?Rule[\t ]+Eire[\t ]/
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Zone_Dublin_post_1968 \
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= (zone == "Europe/Dublin" && $0 ~ /^#?[\t ]+[01]:00[\t ]/ \
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&& (!$(in_comment + 4) || 1968 < $(in_comment + 4)))
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if (Rule_Eire || Zone_Dublin_post_1968) {
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if ((Rule_Eire \
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|| (Zone_Dublin_post_1968 && $(in_comment + 3) == "IST/GMT")) \
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== (DATAFORM != "rearguard")) {
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uncomment = in_comment
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} else {
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comment_out = !in_comment
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}
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}
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# If this line should differ due to Namibia using negative SAVE values,
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# uncomment the desired version and comment out the undesired one.
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Rule_Namibia = $0 ~ /^#?Rule[\t ]+Namibia[\t ]/
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Zone_using_Namibia_rule \
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= (zone == "Africa/Windhoek" && $0 ~ /^#?[\t ]+[12]:00[\t ]/ \
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&& ($(in_comment + 2) == "Namibia" \
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|| ($(in_comment + 2) == "-" && $(in_comment + 3) == "CAT" \
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&& ((1994 <= $(in_comment + 4) && $(in_comment + 4) <= 2017) \
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|| in_comment + 3 == NF))))
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if (Rule_Namibia || Zone_using_Namibia_rule) {
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if ((Rule_Namibia \
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? ($9 ~ /^-/ || ($9 == 0 && $10 == "CAT")) \
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: $(in_comment + 1) == "2:00" && $(in_comment + 2) == "Namibia") \
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== (DATAFORM != "rearguard")) {
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uncomment = in_comment
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} else {
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comment_out = !in_comment
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}
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}
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# If this line should differ due to Portugal benefiting from %z if supported,
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# uncomment the desired version and comment out the undesired one.
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if ($0 ~ /^#?[\t ]+-[12]:00[\t ]+Port[\t ]+[%+-]/) {
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if (($0 ~ /%z/) == (DATAFORM == "vanguard")) {
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uncomment = in_comment
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} else {
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comment_out = !in_comment
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}
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}
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# In vanguard form, use the line "Zone GMT 0 - GMT" instead of
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# "Zone Etc/GMT 0 - GMT" and adjust Link lines accordingly.
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# This works around a bug in TZUpdater 2.3.2.
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if (/^#?(Zone|Link)[\t ]+(Etc\/)?GMT[\t ]/) {
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if (($2 == "GMT") == (DATAFORM == "vanguard")) {
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uncomment = in_comment
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} else {
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comment_out = !in_comment
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}
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}
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if (uncomment) {
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sub(/^#/, "")
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}
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if (comment_out) {
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sub(/^/, "#")
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}
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# Prefer %z in vanguard form, explicit abbreviations otherwise.
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if (DATAFORM == "vanguard") {
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sub(/^(Zone[\t ]+[^\t ]+)?[\t ]+[^\t ]+[\t ]+[^\t ]+[\t ]+[-+][^\t ]+/, \
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"&CHANGE-TO-%z")
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sub(/-00CHANGE-TO-%z/, "-00")
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sub(/[-+][^\t ]+CHANGE-TO-/, "")
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} else {
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if ($0 ~ /^[^#]*%z/) {
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stdoff_column = 2 * ($0 ~ /^Zone/) + 1
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rules_column = stdoff_column + 1
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stdoff = get_minutes($stdoff_column)
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rules = $rules_column
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stdabbr = offset_abbr(stdoff)
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if (rules == "-") {
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abbr = stdabbr
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} else {
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dstabbr_only = rules ~ /^[+0-9-]/
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if (dstabbr_only) {
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dstoff = get_minutes(rules)
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} else {
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# The DST offset is normally an hour, but there are special cases.
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if (rules == "Morocco" && NF == 3) {
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dstoff = -60
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} else if (rules == "NBorneo") {
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dstoff = 20
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} else if (((rules == "Cook" || rules == "LH") && NF == 3) \
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|| (rules == "Uruguay" \
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&& $0 ~ /[\t ](1942 Dec 14|1960|1970|1974 Dec 22)$/)) {
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dstoff = 30
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} else if (rules == "Uruguay" && $0 ~ /[\t ]1974 Mar 10$/) {
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dstoff = 90
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} else {
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dstoff = 60
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}
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}
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dstabbr = offset_abbr(stdoff + dstoff)
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if (dstabbr_only) {
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abbr = dstabbr
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} else {
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abbr = stdabbr "/" dstabbr
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}
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}
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sub(/%z/, abbr)
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}
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}
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# Normally, prefer whole seconds. However, prefer subseconds
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# if generating vanguard form and the otherwise-undocumented
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# VANGUARD_SUBSECONDS environment variable is set.
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# This relies on #STDOFF comment lines in the data.
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# It is for hypothetical clients that support UT offsets that are
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# not integer multiples of one second (e.g., Europe/Lisbon, 1884 to 1912).
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# No known clients need this currently, and this experimental
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# feature may be changed or withdrawn in future releases.
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if ($1 == "#STDOFF") {
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stdoff = $2
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rounded_stdoff = round_to_second(stdoff)
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if (DATAFORM == "vanguard" && ENVIRON["VANGUARD_SUBSECONDS"]) {
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stdoff_subst[0] = rounded_stdoff
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stdoff_subst[1] = stdoff
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} else {
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stdoff_subst[0] = stdoff
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stdoff_subst[1] = rounded_stdoff
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}
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} else if (stdoff_subst[0]) {
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stdoff_column = 2 * ($0 ~ /^Zone/) + 1
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stdoff_column_val = $stdoff_column
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if (stdoff_column_val == stdoff_subst[0]) {
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sub(stdoff_subst[0], stdoff_subst[1])
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} else if (stdoff_column_val != stdoff_subst[1]) {
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stdoff_subst[0] = 0
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}
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}
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# In rearguard form, change the Japan rule line with "Sat>=8 25:00"
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# to "Sun>=9 1:00", to cater to zic before 2007 and to older Java.
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if ($0 ~ /^Rule/ && $2 == "Japan") {
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if (DATAFORM == "rearguard") {
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if ($7 == "Sat>=8" && $8 == "25:00") {
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sub(/Sat>=8/, "Sun>=9")
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sub(/25:00/, " 1:00")
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}
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} else {
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if ($7 == "Sun>=9" && $8 == "1:00") {
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sub(/Sun>=9/, "Sat>=8")
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sub(/ 1:00/, "25:00")
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}
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}
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}
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# In rearguard form, change the Morocco lines with negative SAVE values
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# to use positive SAVE values.
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if ($2 == "Morocco") {
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if ($0 ~ /^Rule/) {
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if ($4 ~ /^201[78]$/ && $6 == "Oct") {
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if (DATAFORM == "rearguard") {
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sub(/\t2018\t/, "\t2017\t")
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} else {
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sub(/\t2017\t/, "\t2018\t")
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}
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}
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if (2019 <= $3) {
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if ($8 == "2:00") {
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if (DATAFORM == "rearguard") {
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sub(/\t0\t/, "\t1:00\t")
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} else {
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sub(/\t1:00\t/, "\t0\t")
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}
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} else {
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if (DATAFORM == "rearguard") {
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sub(/\t-1:00\t/, "\t0\t")
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} else {
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sub(/\t0\t/, "\t-1:00\t")
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}
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}
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}
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}
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if ($1 ~ /^[+0-9-]/ && NF == 3) {
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if (DATAFORM == "rearguard") {
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sub(/1:00\tMorocco/, "0:00\tMorocco")
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sub(/\t\+01\/\+00$/, "\t+00/+01")
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} else {
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sub(/0:00\tMorocco/, "1:00\tMorocco")
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sub(/\t\+00\/+01$/, "\t+01/+00")
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}
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}
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}
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}
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/^Zone/ {
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packrat_ignored = FILENAME == PACKRATDATA && PACKRATLIST && !packratlist[$2];
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}
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{
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if (packrat_ignored && $0 !~ /^Rule/) {
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sub(/^/, "#")
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}
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}
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# Return a link line resulting by changing OLDLINE to link to TARGET
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# from LINKNAME, instead of linking to OLDTARGET from LINKNAME.
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# Align data columns the same as they were in OLDLINE.
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# Also, replace any existing white space followed by comment with COMMENT.
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function make_linkline(oldline, target, linkname, oldtarget, comment, \
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oldprefix, oldprefixlen, oldtargettabs, \
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replsuffix, targettabs)
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{
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oldprefix = "Link\t" oldtarget "\t"
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oldprefixlen = length(oldprefix)
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if (substr(oldline, 1, oldprefixlen) == oldprefix) {
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# Use tab stops to preserve LINKNAME's column.
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replsuffix = substr(oldline, oldprefixlen + 1)
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sub(/[\t ]*#.*/, "", replsuffix)
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oldtargettabs = int(length(oldtarget) / 8) + 1
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targettabs = int(length(target) / 8) + 1
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for (; targettabs < oldtargettabs; targettabs++) {
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replsuffix = "\t" replsuffix
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}
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for (; oldtargettabs < targettabs && replsuffix ~ /^\t/; targettabs--) {
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replsuffix = substr(replsuffix, 2)
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}
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} else {
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# Odd format line; don't bother lining up its replacement nicely.
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replsuffix = linkname
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}
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return "Link\t" target "\t" replsuffix comment
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}
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/^Link/ && $4 == "#=" && DATAFORM == "vanguard" {
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$0 = make_linkline($0, $5, $3, $2)
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}
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# If a Link line is followed by a Link or Zone line for the same data, comment
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# out the Link line. This can happen if backzone overrides a Link
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# with a Zone or a different Link.
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/^Zone/ {
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sub(/^Link/, "#Link", line[linkline[$2]])
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}
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/^Link/ {
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sub(/^Link/, "#Link", line[linkline[$3]])
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linkline[$3] = NR
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linktarget[$3] = $2
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}
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{ line[NR] = $0 }
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function cut_link_chains_short( \
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l, linkname, t, target)
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{
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for (linkname in linktarget) {
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target = linktarget[linkname]
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t = linktarget[target]
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if (t) {
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# TARGET is itself a link name. Replace the line "Link TARGET LINKNAME"
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# with "Link T LINKNAME #= TARGET", where T is at the end of the chain
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# of links that LINKNAME points to.
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while ((u = linktarget[t])) {
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t = u
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}
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l = linkline[linkname]
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line[l] = make_linkline(line[l], t, linkname, target, "\t#= " target)
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}
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}
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}
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END {
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if (DATAFORM != "vanguard") {
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cut_link_chains_short()
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}
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for (i = 1; i <= NR; i++)
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print line[i]
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}
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