FA-80015 / Typography line breaking / Member archive

CJK kinsoku line breaking: hang followed by closer · case 05

A period hangs while its closing bracket starts the next line.

Member previewVariant 5 · 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: hang followed by closer	`["\u3046\u3053\u6587\u7248\u300d\u300d\u3002", "\u3002\u304b\u5b57\u3048\u30fc\u3063", "\u3042\u300d\u3063\u3051\u300f\u3044", "\u304b\u8a9e\u3044\u3063"]`	`["\u3046\u3053\u6587", "\u7248\u300d\u300d\u3002\u3002\u304b", "\u5b57\u3048\u30fc\u3063", "\u3042\u300d\u3063\u3051\u300f\u3044", "\u304b\u8a9e\u3044\u3063"]`	Failed

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