FA-80019 / Typography line breaking / Member archive

CJK kinsoku line breaking: push-out chain · case 04

A run of two prohibited characters still starts the next line.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input [text of full-width characters, line length L]. Lines take L characters. If the next character is a hanging comma/period (、。，．) and is not itself followed by a line-start-prohibited character, it hangs on the line (burasage). Otherwise move characters to the next line while the next line would start with a prohibited character (、。，．）」』！？ー and small kana), then while the line would end with an opening bracket; a line keeps at least one character. Return the lines.

Why this case matters

Line breaking decides where paragraphs wrap on screen and in print; a wrong decision point shifts every following line.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: push-out chain	`["\u300d\u300f\u3053\uff09", "\u300c\u3002\u304d", "\u3083\u300d\u8a9e\u6587", "\u3046\u3046\u300e"]`	`["\u300d\u300f\u3053\uff09", "\u300c\u3002", "\u304d\u3083\u300d\u8a9e", "\u6587\u3046\u3046\u300e"]`	Failed

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