FA-97489 / Knitting and sewing pattern grading / Member archive

Knitting chart row reader: repeated special stitch · case 04

Two consecutive yarn overs print as a single "yo".

Member previewVariant 4 · 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
regression: repeated special stitch	`"k2tog, ssk, yo, k2tog, k1, ssk"`	`"k2tog, ssk, yo x3, k2tog, k1, ssk"`	Failed

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