FAILURE MAP
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FA-80026 / Typography line breaking / Open access

CJK kinsoku line breaking: minimum line content · case 01

Short measures leave two-character lines where one would be legal.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The push-out guard keeps two characters on the line instead of one.

VERIFIED REPAIR

Allow pushing back until a single character remains on the line.

Unsuccessful approach: Keeping half the measure refuses legitimate push-outs.

Case contract

Input [text of full-width characters, line length L]. Lines take L characters. If the next character is a hanging comma/period (、。，．) and is not itself followed by a line-start-prohibited character, it hangs on the line (burasage). Otherwise move characters to the next line while the next line would start with a prohibited character (、。，．）」』！？ー and small kana), then while the line would end with an opening bracket; a line keeps at least one character. 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.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    text, L = x
    NO_START = '、。，．）」』！？ーぁぃぅぇぉっゃゅょ'
    NO_END = '（「『'
    HANG = '、。，．'
    lines = []
    pos = 0
    n = len(text)
    while pos < n:
        end = pos + L
        if end >= n:
            lines.append(text[pos:])
            break
        if text[end] in HANG and (end + 1 >= n or text[end + 1] not in NO_START):
            end += 1
        else:
            while end > pos + 2 and text[end] in NO_START:
                end -= 1
            while end > pos + 1 and text[end - 1] in NO_END:
                end -= 1
        lines.append(text[pos:end])
        pos = end
    return lines
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: minimum line content', ['『ー』かい組ー（本」ー、、本か語っけーえ組か', 3], ['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']), ('regression: minimum line content', ['ゃ、』ーっお字き『あーけお（こ文けゃ』本語組ゃ文', 4], ['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('partial-repair probe', ['、ーく」ゃ』』ー本え組きけ本日こ』', 7], ['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['）っ（こき文う字）お字本かー語本（字か', 4], ['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']), ('control layout', ['こえきかう「（（版', 7], ['こえきかう', '「（（版'])], [('regression: minimum line content', ['文け『い、あ。「日っ」『', 3], ['文け', '『い、', 'あ。', '「', '日っ」', '『']), ('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['「）。文お。い組、、い）、、っ」け「あえいけ日、', 4], ['「）。文', 'お。い', '組、、', 'い', '）', '、、っ」', 'け「あえ', 'いけ日、']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('closing bracket pushes out', ['日本語文」字組版', 4], ['日本語', '文」字組', '版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['（）字「文版い字ー「版ーっ「。』組字組けあか「', 8], ['（）字「文版い', '字ー「版ーっ', '「。』組字組けあ', 'か「']), ('control layout', ['『ー組い、文おけええ「本文か語、ゃお版（か語版『', 6], ['『ー組い、文', 'おけええ「本', '文か語、ゃお', '版（か語版『'])], [('regression: minimum line content', ['、あゃく文え、『か、）版」日ゃ（文『か', 3], ['、あゃ', 'く文え、', '『', 'か、）', '版」', '日ゃ', '（文', '『か']), ('regression: minimum line content', ['文え（』い。版組（あえう語』、）ー本。『組', 3], ['文え', '（』い。', '版組', '（あえ', 'う', '語', '』', '、）ー', '本。', '『組']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['版（組）ーー。）日くああ本', 5], ['版', '（', '組', '）ーー。）', '日くああ本']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('control layout', ['え、かけ語か「『いい日う字え', 6], ['え、かけ語か', '「『いい日う', '字え']), ('control layout', ['けいかお本。。き、こお」こ語語「か組っ「本「', 5], ['けいかお', '本。。き、', 'こお」こ語', '語「か組っ', '「本「'])], [('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['けこけ」組』かお字本いく』「本（い（ゃゃ）かゃ字', 3], ['けこ', 'け」', '組』か', 'お字本', 'いく』', '「本', '（い', '（', 'ゃゃ）', 'かゃ字']), ('regression: minimum line content', ['あく』』ゃあ版き「文』日ううあこ', 4], ['あ', 'く』』ゃ', 'あ版き', '「文』日', 'ううあこ']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('opening bracket at line end', ['日本語「文字」組版', 4], ['日本語', '「文字」', '組版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['本。け本きえこ』', 5], ['本。け本き', 'えこ』']), ('control layout', ['ゃ語く）う、『こ日お組』き『日くこおおい」文ゃ『', 5], ['ゃ語く）う、', '『こ日お', '組』き『日', 'くこおお', 'い」文ゃ『'])], [('regression: minimum line content', ['文ゃー語あ。かこ本か、字、字「ゃおゃ』」、っ', 4], ['文ゃー語', 'あ。かこ', '本か、字、', '字「ゃ', 'お', 'ゃ', '』」、っ']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('regression: minimum line content', ['語字、え『えくゃえー』』ーこ組「日『。（', 4], ['語字、え', '『えくゃ', 'え', 'ー』』ー', 'こ組「日', '『。（']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['語け本日ゃ」）「字、字字', 5], ['語け本', '日ゃ」）', '「字、字字']), ('control layout', ['「『日、く）、」組）っうお。（', 6], ['「『日、', 'く）、」', '組）っうお。', '（'])]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: minimum line content['『ー』', 'かい', '組ー', '（本', '」ー、、', '本か', '語っ', 'けーえ', '組か']['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']Failed
regression: minimum line content['ゃ、', '』ーっお', '字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']Failed
regression: minimum line content['う版あ', 'う。', '、っ', '』、）', '「字。あ', 'かか、『。', 'いおきゃ']['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']Failed
partial-repair probe['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']Passed
small kana prohibited at line start['日本語', 'かっこい', 'い']['日本語', 'かっこい', 'い']Passed
period followed by bracket cannot hang['日本語', '文。」字', '組']['日本語', '文。」字', '組']Passed
control layout['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']Passed
control layout['こえきかう', '「（（版']['こえきかう', '「（（版']Passed

SHA-256 / 6e1961eb654e1c82f9f9e80e12273d3bec313822d0a5fe89b6b5925eb7ec7f0a

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    text, L = x
    NO_START = '、。，．）」』！？ーぁぃぅぇぉっゃゅょ'
    NO_END = '（「『'
    HANG = '、。，．'
    lines = []
    pos = 0
    n = len(text)
    while pos < n:
        end = pos + L
        if end >= n:
            lines.append(text[pos:])
            break
        if text[end] in HANG and (end + 1 >= n or text[end + 1] not in NO_START):
            end += 1
        else:
            while end > pos + L // 2 and text[end] in NO_START:
                end -= 1
            while end > pos + 1 and text[end - 1] in NO_END:
                end -= 1
        lines.append(text[pos:end])
        pos = end
    return lines
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: minimum line content', ['『ー』かい組ー（本」ー、、本か語っけーえ組か', 3], ['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']), ('regression: minimum line content', ['ゃ、』ーっお字き『あーけお（こ文けゃ』本語組ゃ文', 4], ['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('partial-repair probe', ['、ーく」ゃ』』ー本え組きけ本日こ』', 7], ['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['）っ（こき文う字）お字本かー語本（字か', 4], ['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']), ('control layout', ['こえきかう「（（版', 7], ['こえきかう', '「（（版'])], [('regression: minimum line content', ['文け『い、あ。「日っ」『', 3], ['文け', '『い、', 'あ。', '「', '日っ」', '『']), ('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['「）。文お。い組、、い）、、っ」け「あえいけ日、', 4], ['「）。文', 'お。い', '組、、', 'い', '）', '、、っ」', 'け「あえ', 'いけ日、']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('closing bracket pushes out', ['日本語文」字組版', 4], ['日本語', '文」字組', '版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['（）字「文版い字ー「版ーっ「。』組字組けあか「', 8], ['（）字「文版い', '字ー「版ーっ', '「。』組字組けあ', 'か「']), ('control layout', ['『ー組い、文おけええ「本文か語、ゃお版（か語版『', 6], ['『ー組い、文', 'おけええ「本', '文か語、ゃお', '版（か語版『'])], [('regression: minimum line content', ['、あゃく文え、『か、）版」日ゃ（文『か', 3], ['、あゃ', 'く文え、', '『', 'か、）', '版」', '日ゃ', '（文', '『か']), ('regression: minimum line content', ['文え（』い。版組（あえう語』、）ー本。『組', 3], ['文え', '（』い。', '版組', '（あえ', 'う', '語', '』', '、）ー', '本。', '『組']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['版（組）ーー。）日くああ本', 5], ['版', '（', '組', '）ーー。）', '日くああ本']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('control layout', ['え、かけ語か「『いい日う字え', 6], ['え、かけ語か', '「『いい日う', '字え']), ('control layout', ['けいかお本。。き、こお」こ語語「か組っ「本「', 5], ['けいかお', '本。。き、', 'こお」こ語', '語「か組っ', '「本「'])], [('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['けこけ」組』かお字本いく』「本（い（ゃゃ）かゃ字', 3], ['けこ', 'け」', '組』か', 'お字本', 'いく』', '「本', '（い', '（', 'ゃゃ）', 'かゃ字']), ('regression: minimum line content', ['あく』』ゃあ版き「文』日ううあこ', 4], ['あ', 'く』』ゃ', 'あ版き', '「文』日', 'ううあこ']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('opening bracket at line end', ['日本語「文字」組版', 4], ['日本語', '「文字」', '組版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['本。け本きえこ』', 5], ['本。け本き', 'えこ』']), ('control layout', ['ゃ語く）う、『こ日お組』き『日くこおおい」文ゃ『', 5], ['ゃ語く）う、', '『こ日お', '組』き『日', 'くこおお', 'い」文ゃ『'])], [('regression: minimum line content', ['文ゃー語あ。かこ本か、字、字「ゃおゃ』」、っ', 4], ['文ゃー語', 'あ。かこ', '本か、字、', '字「ゃ', 'お', 'ゃ', '』」、っ']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('regression: minimum line content', ['語字、え『えくゃえー』』ーこ組「日『。（', 4], ['語字、え', '『えくゃ', 'え', 'ー』』ー', 'こ組「日', '『。（']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['語け本日ゃ」）「字、字字', 5], ['語け本', '日ゃ」）', '「字、字字']), ('control layout', ['「『日、く）、」組）っうお。（', 6], ['「『日、', 'く）、」', '組）っうお。', '（'])]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: minimum line content['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']Passed
regression: minimum line content['ゃ、', '』ーっお', '字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']Failed
regression: minimum line content['う版あ', 'う。', '、っ', '』、）', '「字。あ', 'かか、『。', 'いおきゃ']['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']Failed
partial-repair probe['、ーく', '」ゃ』』ー本え', '組きけ本日こ』']['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']Failed
small kana prohibited at line start['日本語', 'かっこい', 'い']['日本語', 'かっこい', 'い']Passed
period followed by bracket cannot hang['日本語', '文。」字', '組']['日本語', '文。」字', '組']Passed
control layout['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']Passed
control layout['こえきかう', '「（（版']['こえきかう', '「（（版']Passed

SHA-256 / 0447bd9d62ae2d829cf72f8f4360a66a81e101a57f57548e5a8db8cecb6f342f

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    text, L = x
    NO_START = '、。，．）」』！？ーぁぃぅぇぉっゃゅょ'
    NO_END = '（「『'
    HANG = '、。，．'
    lines = []
    pos = 0
    n = len(text)
    while pos < n:
        end = pos + L
        if end >= n:
            lines.append(text[pos:])
            break
        if text[end] in HANG and (end + 1 >= n or text[end + 1] not in NO_START):
            end += 1
        else:
            while end > pos + 1 and text[end] in NO_START:
                end -= 1
            while end > pos + 1 and text[end - 1] in NO_END:
                end -= 1
        lines.append(text[pos:end])
        pos = end
    return lines
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: minimum line content', ['『ー』かい組ー（本」ー、、本か語っけーえ組か', 3], ['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']), ('regression: minimum line content', ['ゃ、』ーっお字き『あーけお（こ文けゃ』本語組ゃ文', 4], ['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('partial-repair probe', ['、ーく」ゃ』』ー本え組きけ本日こ』', 7], ['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['）っ（こき文う字）お字本かー語本（字か', 4], ['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']), ('control layout', ['こえきかう「（（版', 7], ['こえきかう', '「（（版'])], [('regression: minimum line content', ['文け『い、あ。「日っ」『', 3], ['文け', '『い、', 'あ。', '「', '日っ」', '『']), ('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['「）。文お。い組、、い）、、っ」け「あえいけ日、', 4], ['「）。文', 'お。い', '組、、', 'い', '）', '、、っ」', 'け「あえ', 'いけ日、']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('closing bracket pushes out', ['日本語文」字組版', 4], ['日本語', '文」字組', '版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['（）字「文版い字ー「版ーっ「。』組字組けあか「', 8], ['（）字「文版い', '字ー「版ーっ', '「。』組字組けあ', 'か「']), ('control layout', ['『ー組い、文おけええ「本文か語、ゃお版（か語版『', 6], ['『ー組い、文', 'おけええ「本', '文か語、ゃお', '版（か語版『'])], [('regression: minimum line content', ['、あゃく文え、『か、）版」日ゃ（文『か', 3], ['、あゃ', 'く文え、', '『', 'か、）', '版」', '日ゃ', '（文', '『か']), ('regression: minimum line content', ['文え（』い。版組（あえう語』、）ー本。『組', 3], ['文え', '（』い。', '版組', '（あえ', 'う', '語', '』', '、）ー', '本。', '『組']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['版（組）ーー。）日くああ本', 5], ['版', '（', '組', '）ーー。）', '日くああ本']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('small kana prohibited at line start', ['日本語かっこいい', 4], ['日本語', 'かっこい', 'い']), ('control layout', ['え、かけ語か「『いい日う字え', 6], ['え、かけ語か', '「『いい日う', '字え']), ('control layout', ['けいかお本。。き、こお」こ語語「か組っ「本「', 5], ['けいかお', '本。。き、', 'こお」こ語', '語「か組っ', '「本「'])], [('regression: minimum line content', ['け（こーっ版く」）あ）う組）けあ（う', 3], ['け', '（', 'こーっ', '版', 'く」）', 'あ）う', '組）け', 'あ（う']), ('regression: minimum line content', ['けこけ」組』かお字本いく』「本（い（ゃゃ）かゃ字', 3], ['けこ', 'け」', '組』か', 'お字本', 'いく』', '「本', '（い', '（', 'ゃゃ）', 'かゃ字']), ('regression: minimum line content', ['あく』』ゃあ版き「文』日ううあこ', 4], ['あ', 'く』』ゃ', 'あ版き', '「文』日', 'ううあこ']), ('regression: minimum line content', ['う版あう。、っ』、）「字。あかか、『。いおきゃ', 4], ['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']), ('opening bracket at line end', ['日本語「文字」組版', 4], ['日本語', '「文字」', '組版']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('control layout', ['本。け本きえこ』', 5], ['本。け本き', 'えこ』']), ('control layout', ['ゃ語く）う、『こ日お組』き『日くこおおい」文ゃ『', 5], ['ゃ語く）う、', '『こ日お', '組』き『日', 'くこおお', 'い」文ゃ『'])], [('regression: minimum line content', ['文ゃー語あ。かこ本か、字、字「ゃおゃ』」、っ', 4], ['文ゃー語', 'あ。かこ', '本か、字、', '字「ゃ', 'お', 'ゃ', '』」、っ']), ('regression: minimum line content', ['字きあ）ー『、いあけーけ字字、（き。ー』」」』（', 5], ['字きあ）ー', '『、いあ', 'けーけ字字、', '（', 'き', '。', 'ー』」」』', '（']), ('regression: minimum line content', ['けけーうけゃ）（っ』』）ゃっ組）お', 4], ['けけーう', 'けゃ）', '（', 'っ', '』', '』）ゃっ', '組）お']), ('regression: minimum line content', ['語字、え『えくゃえー』』ーこ組「日『。（', 4], ['語字、え', '『えくゃ', 'え', 'ー』』ー', 'こ組「日', '『。（']), ('period hangs past the measure', ['日本語文。字組版', 4], ['日本語文。', '字組版']), ('period followed by bracket cannot hang', ['日本語文。」字組', 4], ['日本語', '文。」字', '組']), ('control layout', ['語け本日ゃ」）「字、字字', 5], ['語け本', '日ゃ」）', '「字、字字']), ('control layout', ['「『日、く）、」組）っうお。（', 6], ['「『日、', 'く）、」', '組）っうお。', '（'])]]
for label, args, expected in fixtures[N - 1]:
    check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
regression: minimum line content['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']['『ー』', 'かい', '組ー', '（', '本', '」ー、、', '本か', '語っ', 'けーえ', '組か']Passed
regression: minimum line content['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']['ゃ', '、』ーっ', 'お字き', '『あーけ', 'お（こ文', 'けゃ』本', '語組ゃ文']Passed
regression: minimum line content['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']['う版あ', 'う', '。', '、', 'っ』、）', '「字。あ', 'かか、『。', 'いおきゃ']Passed
partial-repair probe['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']['、ー', 'く」ゃ』』ー本', 'え組きけ本日', 'こ』']Passed
small kana prohibited at line start['日本語', 'かっこい', 'い']['日本語', 'かっこい', 'い']Passed
period followed by bracket cannot hang['日本語', '文。」字', '組']['日本語', '文。」字', '組']Passed
control layout['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']['）っ（こ', 'き文う', '字）お字', '本かー語', '本（字か']Passed
control layout['こえきかう', '「（（版']['こえきかう', '「（（版']Passed

SHA-256 / 2fee675c36661f76e4814fa525cf8ad132a1461df5113ea8341491e4f61aa827

Verification & scope

A deterministic toy typesetting model with integer widths and a stipulated rule set; it does not claim conformance to any engine. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:49:50.210038+00:00.

Case digest / dc855f0810835ac0be35a6a22a38b5146f344e5b4834b81f40bb9de5d3f96563