FA-97470 / Knitting and sewing pattern grading / Member archive

Knitting chart row reader: wrong-side parity · case 05

Row 1 of a chart starting on the right side is read as a wrong-side row.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

chart rows are listed bottom-up (row 1 first), cells left-to-right as drawn. Rounds and RS rows read right-to-left unchanged. Flat WS rows (even rows, or odd rows when start_ws) read left-to-right with swaps k<->p, k2tog->p2tog, ssk->ssp, yo stays. Runs of identical stitches merge: k/p as "k3", others as "yo" or "yo x2". Row outside 1..len -> error.

Why this case matters

Chart readers must flip reading direction and stitch meaning on wrong-side rows.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
RS row	`"p2, k1, yo, p2tog"`	`"k2tog, yo, p1, k2"`	Failed

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