FA-80205 / Typography line breaking / Member archive

Ties and discretionary hyphens: space run collapsing · case 05

Double spaces in the source produce double spaces or empty chunks in the output.

Member previewVariant 5 · 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: space run collapsing	`["bc a", "Dr. Knuth", " a ", "Dr. Knuth", " word"]`	`["bc a", "Dr. Knuth", "a", "Dr. Knuth", " word"]`	Failed

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