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brainstorming the flattening algorithm, slight API change

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aj
2010-11-09 23:32:25 -08:00
parent d00937c3e9
commit 216a8d9ff8
3 changed files with 259 additions and 100 deletions
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249
notes/flatten_pseudocode.svg
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x="84.285713"
y="431.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan14687"> convert datetime to UTC</tspan><tspan
id="tspan2915" /><tspan
sodipodi:role="line"
x="64.285713"
y="487.505"
x="84.285713"
y="453.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2874"> -using zoneinfo</tspan></text>
<path
style="fill:none;stroke:#f57900;stroke-width:10;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:30,30;stroke-dashoffset:0"
d="M 447.14286,259.50504 C 439.90168,446.30825 427.1765,614.16673 378.57143,658.07647"
id="path2876"
sodipodi:nodetypes="cc" />
<path
sodipodi:nodetypes="cc"
id="path3695"
d="M 538.57143,546.64789 C 486.40259,543.20247 425.55741,569.59524 400.00001,648.07647"
style="fill:none;stroke:#4e9a06;stroke-width:10;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:30, 30;stroke-dashoffset:0" />
id="tspan2913">offset= zone's STD offset</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="475.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2911">previous_dst= none</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="497.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2923">previous_end= minimum</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="519.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2921" /><tspan
sodipodi:role="line"
x="84.285713"
y="541.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2938">until zone_end</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="563.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2883"> dst= previous_dst</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="585.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2857"> begin= previous_end</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="607.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2925" /><tspan
sodipodi:role="line"
x="84.285713"
y="629.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2859"> dchange= next change after begin</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="651.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2862" /><tspan
sodipodi:role="line"
x="84.285713"
y="673.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2861"> if zone ends before dchange:</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="695.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2869"> convert zone end to all times</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="717.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2863"> create #rulerange</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="739.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2873"> zone_end</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="761.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2865"> else</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="783.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2871"> convert dchange to all times</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="805.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan3707"> create #rulerange</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="827.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2944" /><tspan
sodipodi:role="line"
x="84.285713"
y="849.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2940"> previous_end= dchange</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="871.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2948"> previous_dst= dchange's DST setting</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="893.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2950" /><tspan
sodipodi:role="line"
x="84.285713"
y="915.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan2875"> next rule</tspan><tspan
sodipodi:role="line"
x="84.285713"
y="937.505"
style="font-size:22px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:start;line-height:100%;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;font-family:Andale Mono;-inkscape-font-specification:Andale Mono"
id="tspan3717" /></text>
</g>
</svg>
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101
notes/rule_parsing_by_hand.txt Normal file
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New York:
zone1.
offset= {-4, 56, 02}
ends= {{1883, 11, 18}, {12,03,57}, w}
or {{1883, 11, 18}, {12,03,57}, s}
or {{1883, 11, 18}, {16,59,59}, u}
from minimum
dst= none
% zone change
end= zone1.ends
zone2.
offset= {-5,0,0}
ends= {{1920,1,1}, {0,0,0}, w}
from zone1.ends+1sec
dst= none
% dst event
end= {{1918,3,31}, {1,59,59}, w}
or {{1918,3,31}, {1,59,59}, s}
or {{1918,3,31}, {6,59,59}, u}
from {{1918,3,31}, {7,0,0}, u}
dst= {1,0,0}
% dst event
end= {{1918,10,27}, {1,59,59}, w}
or {{1918,10,27}, {0,59,59}, s}
or {{1918,10,27}, {5,59,59}, u}
from {{1918,10,27}, {6,0,0}, u}
dst= none
% dst event
end= {{1919,3,30}, {1,59,59}, w}
or {{1919,3,30}, {1,59,59}, s}
or {{1919,3,30}, {6,59,59}, u}
from {{1919,3,30}, {7,0,0}, u}
dst= {1,0,0}
% dst event
end= {{1919,10,26}, {1,59,59}, w}
or {{1919,10,26}, {0,59,59}, s}
or {{1919,10,26}, {5,59,59}, u}
from {{1919,10,26}, {5,59,59}, u}
dst= none
% zone end
end= {{1919,12,31}, {23,59,59}, w}
or {{1919,12,31}, {23,59,59}, s}
or {{1920,1,1}, {4,59,59}, u}
zone3.
offset= {-5,0,0}
ends= {{1942,1,1}, {0,0,0}, w}
from {{1920,1,1}, {5,0,0}, u}
dst= none %from previous
GENERAL PATTERN
in zoneX.
offset= {HH,MM,SS}
end= {{Y,M,D},{HH,MM,SS}, w} %% usually wall-time, can be otherwise
from previous.ends +1sec
dst= previous.dst
calculate all times for begin (w/s/u)
foreach rule:
given begin, current dst and offset,
- calculate oldest change > begin %% may be none
nextRule= the rule with the earliest of these dates
if nextRule.start > zoneX.end:
end= zoneX.end-1sec
next_zone (offset & end)
else:
end= oldest.time-1sec
nextDst= nextRule.dst
nextBegin= end+1sec