FA-80197 / Typography line breaking / Member archive

Ties and discretionary hyphens: invisible break rendering · case 02

Zero-width break opportunities show up as spaces.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Input [source, width]. Runs of spaces are one breakable space; "~" is an unbreakable space rendered " "; "\-" is a discretionary hyphen: invisible unless the line breaks there, then rendered "-"; "|" is an invisible break opportunity. Greedy: append the next chunk if the line (without a potential hyphen) fits, else break at that opportunity. Return rendered 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: invisible break rendering	`["url path", " composition", "b c b c url", "path word", "Dr. Knuth", "url path hy-", "phen"]`	`["urlpath com-", "position bc", "bc urlpath", "word", "Dr. Knuth", "urlpath hy-", "phen"]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.