[ruby/date] Add more timezone abbreviations

This gets the time zone abbreviations from
https://www.timeanddate.com/time/zones/, and adds unambiguous time
zones not already present in zonetab.list.  See bin/update-abbr
for the program used.

This regenerates zonetab.h using prereq.mk (requires gperf).

Only one test line is added, just to make sure a new time zone
abbreviation is picked up.

Fixes Ruby Bug 16286

https://github.com/ruby/date/commit/702e8b3033

bin/update-abbr

@@ -0,0 +1,35 @@
+require 'nokogiri'
+require 'open-uri'
+
+doc = Nokogiri::HTML(URI.open('https://www.timeanddate.com/time/zones/'))
+
+h = {}
+
+doc.css('#tz-abb tbody tr').each do |tr|
+  tds = tr.css('td')
+  abbr = tds[0].text.strip.downcase
+  offset = tds[3].text.strip.gsub(/UTC\s*/, '')
+  next if offset.include?('/') # skip ambiguous timezones
+  next if offset.empty?
+
+
+  hour, min = offset.split(':', 2)
+  offset = (Integer(hour) * 60 + (Integer(min || 0)))*60
+  if h.has_key?(abbr)
+    h[abbr] = false
+  else
+    h[abbr] = offset
+  end
+end
+
+h.delete_if{|_,v| !v}
+
+lines = File.readlines('ext/date/zonetab.list')
+lines.select{|l| l.include?(',')}.
+  map{|l| l.split(',', 2)[0]}.
+  each{|a| h.delete(a)}
+
+h.sort.map{|k,v| "#{k},#{v}"}
+lines.insert(-2, h.sort.map{|k,v| "#{k},#{v}\n"})
+lines.flatten!
+File.write('ext/date/zonetab.list', lines.join)

ext/date/zonetab.list

@@ -178,4 +178,150 @@ w. europe,                3600
 west asia,               18000
 west pacific,            36000
 yakutsk,                 32400
+acdt,37800
+acst,34200
+act,-18000
+acwst,31500
+aedt,39600
+aest,36000
+aft,16200
+almt,21600
+anast,43200
+anat,43200
+aoe,-43200
+aqtt,18000
+awdt,32400
+awst,28800
+azost,0
+azot,-3600
+azst,18000
+azt,14400
+bnt,28800
+bot,-14400
+btt,21600
+cast,28800
+chadt,49500
+chast,45900
+chost,32400
+chot,28800
+chst,36000
+chut,36000
+cidst,-14400
+cist,-18000
+ckt,-36000
+cot,-18000
+cvt,-3600
+cxt,25200
+davt,25200
+ddut,36000
+easst,-18000
+ect,-18000
+egst,0
+egt,-3600
+fet,10800
+fjst,46800
+fjt,43200
+fkst,-10800
+fkt,-14400
+fnt,-7200
+galt,-21600
+gamt,-32400
+get,14400
+gft,-10800
+gilt,43200
+gyt,-14400
+hkt,28800
+hovst,28800
+hovt,25200
+ict,25200
+idt,10800
+iot,21600
+irdt,16200
+irkst,32400
+irkt,28800
+irst,12600
+kgt,21600
+kost,39600
+krast,28800
+krat,25200
+kuyt,14400
+lhdt,39600
+lhst,37800
+lint,50400
+magst,43200
+magt,39600
+mart,-30600
+mawt,18000
+mht,43200
+mmt,23400
+mut,14400
+mvt,18000
+myt,28800
+nct,39600
+nfdt,43200
+nft,39600
+novst,25200
+novt,25200
+npt,20700
+nrt,43200
+nut,-39600
+omsst,25200
+omst,21600
+orat,18000
+pet,-18000
+petst,43200
+pett,43200
+pgt,36000
+phot,46800
+pht,28800
+pkt,18000
+pmdt,-7200
+pmst,-10800
+pont,39600
+pwt,32400
+pyst,-10800
+qyzt,21600
+ret,14400
+rott,-10800
+sakt,39600
+samt,14400
+sbt,39600
+sct,14400
+sret,39600
+srt,-10800
+syot,10800
+taht,-36000
+tft,18000
+tjt,18000
+tkt,46800
+tlt,32400
+tmt,18000
+tost,50400
+tot,46800
+trt,10800
+tvt,43200
+ulast,32400
+ulat,28800
+uyst,-7200
+uyt,-10800
+uzt,18000
+vet,-14400
+vlast,39600
+vlat,36000
+vost,21600
+vut,39600
+wakt,43200
+warst,-10800
+wft,43200
+wgst,-7200
+wgt,-10800
+wib,25200
+wit,32400
+wita,28800
+wt,0
+yakst,36000
+yakt,32400
+yapt,36000
+yekst,21600
+yekt,18000
 %%

test/date/test_date_parse.rb

@@ -24,6 +24,7 @@ class TestDateParse < Test::Unit::TestCase
      [['Sat Aug 28 02:29:34 JST 02',true],[2002,8,28,2,29,34,'JST',9*3600,6], __LINE__],
      [['Sat Aug 28 02:29:34 JST 0002',false],[2,8,28,2,29,34,'JST',9*3600,6], __LINE__],
      [['Sat Aug 28 02:29:34 JST 0002',true],[2,8,28,2,29,34,'JST',9*3600,6], __LINE__],
+     [['Sat Aug 28 02:29:34 AEST 0002',true],[2,8,28,2,29,34,'AEST',10*3600,6], __LINE__],
 
      [['Sat Aug 28 02:29:34 GMT+09 0002',false],[2,8,28,2,29,34,'GMT+09',9*3600,6], __LINE__],
      [['Sat Aug 28 02:29:34 GMT+0900 0002',false],[2,8,28,2,29,34,'GMT+0900',9*3600,6], __LINE__],