FA-79948 / Typography line breaking / Member archive

Consecutive hyphen limit: hyphen glyph width · case 03

Hyphenated lines overflow the measure by one unit.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input [words as syllable lists, width, limit]. Greedy fill with 1-unit spaces and characters. A word that does not fit may be split at the latest syllable boundary whose head plus "-" fits, only if fewer than limit immediately preceding lines ended in a hyphen and the word is not the paragraph's last word. A line ended without hyphen resets the streak; a word too long for an empty line is set alone. 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: hyphen glyph width	`["paragraph", "breaking a", "column set-", "ting mar-", "gin text", "kerning", "justified", "interna-", "tional", "breaking"]`	`["paragraph", "breaking a", "column", "setting", "margin", "text kern-", "ing justi-", "fied", "interna-", "tional", "breaking"]`	Failed

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