FA-79928 / Typography line breaking / Member archive

Pattern-based hyphenation: left hyphen minimum · case 03

Words are hyphenated one letter too late at the start.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input [word, patterns, exceptions, lefthyphenmin, righthyphenmin]. An exception (hyphenated, lowercase) matching the lowercased word dictates the hyphens and keeps the word's own letters. Otherwise the lowercased word is padded with dots, every substring pattern contributes its digits and the maximum digit per gap wins; odd values allow a hyphen. A hyphen before letter i needs i>=lefthyphenmin and len-i>=righthyphenmin. Return the word with "-" inserted.

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: left hyphen minimum	`"typeset-ting"`	`"ty-peset-ting"`	Failed

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