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fix: non_word_boundary uses the Word property like Ruby's \B #20

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ronaldtse merged 2 commits into from
Oct 1, 2026
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fix: non_word_boundary uses the Word property like Ruby's \B #20

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f5e4b6e
fix: non_word_boundary uses the Word property like Ruby's \B
ronaldtse Oct 1, 2026
f09ce35
test: use the map's canonical mark order in the Allah pin
ronaldtse Oct 1, 2026
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3 changes: 2 additions & 1 deletion src/interscript/expr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -98,6 +98,7 @@ def _read_bracketed(expr: str, pos: int) -> tuple[str, int]:
# \w, plus the Join_Control characters.
_WORD = "[\\ẁ-ͯ҃-҉֑-ֽֿׁ-ׂׄ-ׇׅؐ-ًؚ-ٰٟۖ-ۜ۟-ۤۧ-۪ۨ-ܑۭܰ-݊ަ-ް߫-߽߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛࣓-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢ-ॣঁ-ঃ়া-ৄে-ৈো-্ৗৢ-ৣ৾ਁ-ਃ਼ਾ-ੂੇ-ੈੋ-੍ੑੰ-ੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢ-ૣૺ-૿ଁ-ଃ଼ା-ୄେ-ୈୋ-୍୕-ୗୢ-ୣஂா-ூெ-ைொ-்ௗఀ-ఄా-ౄె-ైొ-్ౕ-ౖౢ-ౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕ-ೖೢ-ೣഀ-ഃ഻-഼ാ-ൄെ-ൈൊ-്ൗൢ-ൣඁ-ඃ්ා-ුූෘ-ෟෲ-ෳัิ-ฺ็-๎ັິ-ຼ່-ໍ༘-༹༙༵༷༾-༿ཱ-྄྆-྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒ-ᝓᝲ-ᝳ឴-៓៝᠋-᠍ᢅ-ᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-ᫀᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭᳴᳷-᳹᷀-᷹᷻-᷿⃐-⃰⳯-⵿⳱ⷠ-〪ⷿ-゙〯-゚꙯-꙲ꙴ-꙽ꚞ-ꚟ꛰-꛱ꠂ꠆ꠋꠣ-ꠧ꠬ꢀ-ꢁꢴ-ꣅ꣠-꣱ꣿꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌ-ꩍꩻ-ꩽꪰꪲ-ꪴꪷ-ꪸꪾ-꪿꫁ꫫ-ꫯꫵ-꫶ꯣ-ꯪ꯬-꯭ﬞ︀-️︠-𐇽𐋠︯𐍶-𐍺𐨁-𐨃𐨅-𐨆𐨌-𐨏𐨸-𐨿𐨺𐫥-𐫦𐴤-𐴧𐺫-𐽆𐺬-𐽐𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑄴𑅅-𑅆𑅳𑆀-𑆂𑆳-𑇀𑇉-𑇌𑇎-𑇏𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌻-𑌼𑌾-𑍄𑍇-𑍈𑍋-𑍍𑍗𑍢-𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑑞𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜-𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑠬-𑠺𑤰-𑤵𑤷-𑤸𑤻-𑤾𑥀𑥂-𑥃𑧑-𑧗𑧚-𑧠𑧤𑨁-𑨊𑨳-𑨹𑨻-𑨾𑩇𑩑-𑩛𑪊-𑪙𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𑴱-𑴶𑴺𑴼-𑴽𑴿-𑵅𑵇𑶊-𑶎𑶐-𑶑𑶓-𑶗𑻳-𑻶𖫰-𖫴𖬰-𖬶𖽏𖽑-𖾇𖾏-𖾒𖿤𖿰-𖿱𛲝-𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣-𞀤𞀦-𞀪𞄰-𞄶𞋬-𞣐𞋯-𞣖𞥄-𞥊󠄀-󠇯\u200C\u200D]"
_BOUNDARY = "(?:(?<=" + _WORD + ")(?!" + _WORD + ")|(?<!" + _WORD + ")(?=" + _WORD + "))"
_NON_WORD_BOUNDARY = "(?:(?<=" + _WORD + ")(?=" + _WORD + ")|(?<!" + _WORD + ")(?!" + _WORD + "))"


def _unesc(s: str) -> str:
Expand Down Expand Up @@ -275,7 +276,7 @@ def expr_to_regex(expr: str) -> str:
elif kind == "boundary":
parts.append(_BOUNDARY)
elif kind == "nwb":
parts.append(r"\B")
parts.append(_NON_WORD_BOUNDARY)
elif kind == "grp":
parts.append("(" + expr_to_regex(value) + ")")
elif kind == "anchor":
Expand Down
13 changes: 13 additions & 0 deletions tests/test_engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -396,3 +396,16 @@ def test_library_string_alias_is_a_class_inside_any():
e = _load("alalc-ell-Grek-Latn-2010")
assert e.transliterate("γκέγκε") == "gkenke"
assert e.transliterate("Λαγκαδάς") == "Lankadas"


@pytest.mark.skipif(not MAPS.is_dir(), reason="interscript maps repo not present")
def test_non_word_boundary_uses_the_word_property():
"""odni-ara contracts maybe(damma)+ال after non_word_boundary; at a
damma|alif junction Ruby's \\B holds (both are Word-property
characters) but raw Python \\B, built on a mark-less \\w, does not —
نُورُالدِين came out Nurualdin instead of Nur al Din."""
e = _load("odni-ara-Arab-Latn-2015")
assert e.transliterate("نُورُالدِين") == "Nur al Din"
# the map's own spelling (shadda before fatha); a fatha-before-
# shadda variant yields the same result in Ruby and here.
assert e.transliterate("عَبدُاللَّه") == "’Abdallah"
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