{"abstract":"Accessible edits accept negative source offsets.","category":"Accessibility interaction semantics","checks":6,"contract":"Input [text,readonly,maximum,operations] operations [start,end,replacement]. Validate integer codepoint bounds 0<=start<=end<=len(current_text); readonly rejects each edit. Replace half-open range; reject proposed length beyond maximum (None unlimited) atomically. Return [final_text,edit_results] where successful result [True,caret,delta] caret is start+replacement length and delta replacement length minus removed length; rejected [False,None,0]. Empty replacement deletes, empty interval inserts. Subsequent offsets address current text.","contract_signature":"data","evaluation_group":"s3-accessibility-text-edit-adapter","failed_approach":"The local repair substitutes -1 <= start <= end <= len(text) but still mishandles the regression fixtures.","family":"s3-accessibility-text-edit-adapter-negative-range","id":"FA-54061","implementations":{"attempt":{"sha256":"9bb8974de04a32ae1d9a68d404548db4436fc9cabd94bf37edd664c14cf7319d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(data):\n    text,readonly,maximum,operations = data\n    results = []\n    for start,end,replacement in operations:\n        if readonly or not (-1 <= start <= end <= len(text)):\n            results.append([False,None,0]); continue\n        proposed = text[:start]+replacement+text[end:]\n        if maximum is not None and len(proposed) > maximum:\n            results.append([False,None,0]); continue\n        delta = len(replacement)-(end-start)\n        text = proposed\n        results.append([True,start+len(replacement),delta])\n    return [text,results]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('contract fixture 1', solve(['A'*N+'BC',False,None,[[N,N+1,'xy'],[N+2,N+3,'']]],), ['A'*N+'xy',[[True,N+2,1],[True,N+2,-1]]])\ncheck('contract fixture 2', solve(['ab',False,3,[[1,1,'X'],[0,0,'Y']]],), ['aXb',[[True,2,1],[False,None,0]]])\ncheck('contract fixture 3', solve(['ab',True,None,[[0,2,'x']]],), ['ab',[[False,None,0]]])\ncheck('contract fixture 4', solve(['ab',False,None,[[-1,1,'x'],[2,1,'x'],[0,3,'x']]],), ['ab',[[False,None,0],[False,None,0],[False,None,0]]])\ncheck('contract fixture 5', solve(['',False,0,[[0,0,''],[0,0,'x']]],), ['',[[True,0,0],[False,None,0]]])\ncheck('contract fixture 6', solve(['😀x',False,None,[[0,1,'é']]],), ['éx',[[True,1,0]]])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"45d28f7b414959d02bb27dbe840aee4b732925ff879c9d305633d057ac3a3c00","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(data):\n    text,readonly,maximum,operations = data\n    results = []\n    for start,end,replacement in operations:\n        if readonly or not (start <= end <= len(text)):\n            results.append([False,None,0]); continue\n        proposed = text[:start]+replacement+text[end:]\n        if maximum is not None and len(proposed) > maximum:\n            results.append([False,None,0]); continue\n        delta = len(replacement)-(end-start)\n        text = proposed\n        results.append([True,start+len(replacement),delta])\n    return [text,results]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('contract fixture 1', solve(['A'*N+'BC',False,None,[[N,N+1,'xy'],[N+2,N+3,'']]],), ['A'*N+'xy',[[True,N+2,1],[True,N+2,-1]]])\ncheck('contract fixture 2', solve(['ab',False,3,[[1,1,'X'],[0,0,'Y']]],), ['aXb',[[True,2,1],[False,None,0]]])\ncheck('contract fixture 3', solve(['ab',True,None,[[0,2,'x']]],), ['ab',[[False,None,0]]])\ncheck('contract fixture 4', solve(['ab',False,None,[[-1,1,'x'],[2,1,'x'],[0,3,'x']]],), ['ab',[[False,None,0],[False,None,0],[False,None,0]]])\ncheck('contract fixture 5', solve(['',False,0,[[0,0,''],[0,0,'x']]],), ['',[[True,0,0],[False,None,0]]])\ncheck('contract fixture 6', solve(['😀x',False,None,[[0,1,'é']]],), ['éx',[[True,1,0]]])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Stipulated finite adapter contract, not a claim of platform accessibility or ARIA conformance. 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.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-accessibility-text-edit-adapter-negative-range","generated_at":"2026-09-29T14:45:45.241985+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline accessibility bridge model with explicit policy; useful for testing semantic API adapters independently of browser implementations.","root_cause":"The negative range decision in the text edit adapter adapter violates its declared contract.","sha256":"ea66fa188bc51482e8c9ab115414a6dda7fff00dab8d1f57075f17f65a3aeef5","title":"Accessible edits accept negative source offsets · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":45.509,"exit_code":1,"observations":[{"actual":["Axy",[[true,3,1],[true,3,-1]]],"check":"contract fixture 1","expected":["Axy",[[true,3,1],[true,3,-1]]],"passed":true},{"actual":["aXb",[[true,2,1],[false,null,0]]],"check":"contract fixture 2","expected":["aXb",[[true,2,1],[false,null,0]]],"passed":true},{"actual":["ab",[[false,null,0]]],"check":"contract fixture 3","expected":["ab",[[false,null,0]]],"passed":true},{"actual":["x",[[true,0,-1],[false,null,0],[true,1,-2]]],"check":"contract fixture 4","expected":["ab",[[false,null,0],[false,null,0],[false,null,0]]],"passed":false},{"actual":["",[[true,0,0],[false,null,0]]],"check":"contract fixture 5","expected":["",[[true,0,0],[false,null,0]]],"passed":true},{"actual":["éx",[[true,1,0]]],"check":"contract fixture 6","expected":["éx",[[true,1,0]]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"contract fixture 1\", \"actual\": [\"Axy\", [[true, 3, 1], [true, 3, -1]]], \"expected\": [\"Axy\", [[true, 3, 1], [true, 3, -1]]], \"passed\": true}, {\"check\": \"contract fixture 2\", \"actual\": [\"aXb\", [[true, 2, 1], [false, null, 0]]], \"expected\": [\"aXb\", [[true, 2, 1], [false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 3\", \"actual\": [\"ab\", [[false, null, 0]]], \"expected\": [\"ab\", [[false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 4\", \"actual\": [\"x\", [[true, 0, -1], [false, null, 0], [true, 1, -2]]], \"expected\": [\"ab\", [[false, null, 0], [false, null, 0], [false, null, 0]]], \"passed\": false}, {\"check\": \"contract fixture 5\", \"actual\": [\"\", [[true, 0, 0], [false, null, 0]]], \"expected\": [\"\", [[true, 0, 0], [false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 6\", \"actual\": [\"éx\", [[true, 1, 0]]], \"expected\": [\"éx\", [[true, 1, 0]]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":46.591,"exit_code":1,"observations":[{"actual":["Axy",[[true,3,1],[true,3,-1]]],"check":"contract fixture 1","expected":["Axy",[[true,3,1],[true,3,-1]]],"passed":true},{"actual":["aXb",[[true,2,1],[false,null,0]]],"check":"contract fixture 2","expected":["aXb",[[true,2,1],[false,null,0]]],"passed":true},{"actual":["ab",[[false,null,0]]],"check":"contract fixture 3","expected":["ab",[[false,null,0]]],"passed":true},{"actual":["x",[[true,0,-1],[false,null,0],[true,1,-2]]],"check":"contract fixture 4","expected":["ab",[[false,null,0],[false,null,0],[false,null,0]]],"passed":false},{"actual":["",[[true,0,0],[false,null,0]]],"check":"contract fixture 5","expected":["",[[true,0,0],[false,null,0]]],"passed":true},{"actual":["éx",[[true,1,0]]],"check":"contract fixture 6","expected":["éx",[[true,1,0]]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"contract fixture 1\", \"actual\": [\"Axy\", [[true, 3, 1], [true, 3, -1]]], \"expected\": [\"Axy\", [[true, 3, 1], [true, 3, -1]]], \"passed\": true}, {\"check\": \"contract fixture 2\", \"actual\": [\"aXb\", [[true, 2, 1], [false, null, 0]]], \"expected\": [\"aXb\", [[true, 2, 1], [false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 3\", \"actual\": [\"ab\", [[false, null, 0]]], \"expected\": [\"ab\", [[false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 4\", \"actual\": [\"x\", [[true, 0, -1], [false, null, 0], [true, 1, -2]]], \"expected\": [\"ab\", [[false, null, 0], [false, null, 0], [false, null, 0]]], \"passed\": false}, {\"check\": \"contract fixture 5\", \"actual\": [\"\", [[true, 0, 0], [false, null, 0]]], \"expected\": [\"\", [[true, 0, 0], [false, null, 0]]], \"passed\": true}, {\"check\": \"contract fixture 6\", \"actual\": [\"éx\", [[true, 1, 0]]], \"expected\": [\"éx\", [[true, 1, 0]]], \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}