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Diffstat (limited to 'tz/ziguard.awk')
| -rw-r--r-- | tz/ziguard.awk | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/tz/ziguard.awk b/tz/ziguard.awk new file mode 100644 index 0000000..7d6f7c9 --- /dev/null +++ b/tz/ziguard.awk @@ -0,0 +1,132 @@ +# Convert tzdata source into vanguard or rearguard form. + +# Contributed by Paul Eggert. This file is in the public domain. + +# This is not a general-purpose converter; it is designed for current tzdata. +# It just converts from current source to main, vanguard, and rearguard forms. +# Although it might be nice for it to be idempotent, or to be useful +# for converting back and forth between vanguard and rearguard formats, +# it does not do these nonessential tasks now. +# +# Although main and vanguard forms are currently equivalent, +# this need not always be the case. +# +# When converting to vanguard form, the output can use negative SAVE +# values. +# +# When converting to rearguard form, the output uses only nonnegative +# SAVE values. The idea is for the output data to simulate the behavior +# of the input data as best it can within the constraints of the +# rearguard format. + +BEGIN { + dataform_type["vanguard"] = 1 + dataform_type["main"] = 1 + dataform_type["rearguard"] = 1 + + # The command line should set DATAFORM. + if (!dataform_type[DATAFORM]) exit 1 + vanguard = DATAFORM == "vanguard" +} + +/^Zone/ { zone = $2 } + +DATAFORM != "main" { + in_comment = /^#/ + uncomment = comment_out = 0 + + # If this line should differ due to Czechoslovakia using negative SAVE values, + # uncomment the desired version and comment out the undesired one. + if (zone == "Europe/Prague" && /^#?[\t ]+[01]:00[\t ]/ && /1947 Feb 23/) { + if (($(in_comment + 2) != "-") == vanguard) { + uncomment = in_comment + } else { + comment_out = !in_comment + } + } + + # If this line should differ due to Ireland using negative SAVE values, + # uncomment the desired version and comment out the undesired one. + Rule_Eire = /^#?Rule[\t ]+Eire[\t ]/ + Zone_Dublin_post_1968 \ + = (zone == "Europe/Dublin" && /^#?[\t ]+[01]:00[\t ]/ \ + && (!$(in_comment + 4) || 1968 < $(in_comment + 4))) + if (Rule_Eire || Zone_Dublin_post_1968) { + if ((Rule_Eire \ + || (Zone_Dublin_post_1968 && $(in_comment + 3) == "IST/GMT")) \ + == vanguard) { + uncomment = in_comment + } else { + comment_out = !in_comment + } + } + + # If this line should differ due to Namibia using negative SAVE values, + # uncomment the desired version and comment out the undesired one. + Rule_Namibia = /^#?Rule[\t ]+Namibia[\t ]/ + Zone_using_Namibia_rule \ + = (zone == "Africa/Windhoek" && /^#?[\t ]+[12]:00[\t ]/ \ + && ($(in_comment + 2) == "Namibia" \ + || ($(in_comment + 2) == "-" && $(in_comment + 3) == "CAT" \ + && ((1994 <= $(in_comment + 4) && $(in_comment + 4) <= 2017) \ + || in_comment + 3 == NF)))) + if (Rule_Namibia || Zone_using_Namibia_rule) { + if ((Rule_Namibia \ + ? ($(in_comment + 9) ~ /^-/ \ + || ($(in_comment + 9) == 0 && $(in_comment + 10) == "CAT")) \ + : $(in_comment + 1) == "2:00" && $(in_comment + 2) == "Namibia") \ + == vanguard) { + uncomment = in_comment + } else { + comment_out = !in_comment + } + } + + if (uncomment) { + sub(/^#/, "") + } + if (comment_out) { + sub(/^/, "#") + } + + # In rearguard format, change the Japan rule line with "Sat>=8 25:00" + # to "Sun>=9 1:00", to cater to zic before 2007 and to older Java. + if (!vanguard && $1 == "Rule" && $7 == "Sat>=8" && $8 == "25:00") { + sub(/Sat>=8/, "Sun>=9") + sub(/25:00/, " 1:00") + } + + # In rearguard format, change the Morocco lines with negative SAVE values + # to use positive SAVE values. + if (!vanguard && $1 == "Rule" && $2 == "Morocco" && $4 == 2018 \ + && $6 == "Oct") { + sub(/\t2018\t/, "\t2017\t") + } + if (!vanguard && $1 == "Rule" && $2 == "Morocco" && 2019 <= $3) { + if ($9 == "0") { + sub(/\t0\t/, "\t1:00\t") + } else { + sub(/\t-1:00\t/, "\t0\t") + } + } + if (!vanguard && $1 == "1:00" && $2 == "Morocco" && $3 == "+01/+00") { + sub(/1:00\tMorocco\t\+01\/\+00$/, "0:00\tMorocco\t+00/+01") + } +} + +# If a Link line is followed by a Zone line for the same data, comment +# out the Link line. This can happen if backzone overrides a Link +# with a Zone. +/^Link/ { + linkline[$3] = NR +} +/^Zone/ { + sub(/^Link/, "#Link", line[linkline[$2]]) +} + +{ line[NR] = $0 } + +END { + for (i = 1; i <= NR; i++) + print line[i] +} |