FA-80218 / Typography line breaking / Member archive

Ragged-right hyphenation zone: slack separator · case 03

Slack is overstated by one on lines that already hold text.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input [words as syllables, width, zone, min word length, min chars before, min chars after, hyphenate capitals]. Greedy fill. A word that does not fit may be hyphenated only if the slack left on the line (width minus current text minus the separating space) is at least the zone, the word has at least min-word characters, and (capitals allowed or its first letter is not uppercase). Pick the latest syllable boundary with head >= min before and tail >= min after chars whose head plus "-" fits. Return 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: slack separator	`["hyphenated in-", "ternational the", "a the typogra-", "phy McDonald", "set Berlin"]`	`["hyphenated", "international", "the a the typo-", "graphy McDonald", "set Berlin"]`	Failed

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