FA-69257 / Tide and marine navigation tables / Member archive

Light characteristic abbreviation: Fractional periods are not recognised · case 02

Quick lights with 1.2 s or 2.5 s periods fail to parse.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input a chart light abbreviation such as "Fl(3)WR.10s15m20M". Return [class, groups, colours, period_s, height_m, range_nm]: class includes an "Al." prefix; groups is a list (composite "2+1" -> [2,1], default [1]); colours default "W"; missing numbers are None. Unparseable strings return None.

Why this case matters

Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
light characteristic abbreviation "Q.1.2s"	`null`	`["Q", [1], "W", 1.2, null, null]`	Failed

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