FA-97464 / Knitting and sewing pattern grading / Member archive

Pattern row locator: row origin guard · case 04

Row 0 is accepted as setup row 0.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Rows are 1-based. Rows 1..setup are ["setup", row]. The next length*repeats rows are ["repeat", repeat_number, row_in_repeat] (both 1-based). Later rows are ["finishing", k] counting from 1 after the last repeat. row < 1 -> "error: rows start at 1".

Why this case matters

Row counter apps must map an absolute row number onto setup, repeat and finishing sections.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
row zero	`["setup", 0]`	`"error: rows start at 1"`	Failed

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