{"abstract":"A closer pairs with the outermost matching opener.","category":"Bidirectional text layout","checks":8,"contract":"Input [text, classes, stack limit]. Only characters of class ON take part. Openers ( [ { are pushed; on overflow of the stack limit stop and keep pairs found so far. A closer searches the stack from the top for its opener; if found it pairs and discards that entry and everything above; otherwise it is ignored. Return pairs sorted by opener.","evaluation_group":"w2-bidirectional-text-layout-bracket-pairs","failed_approach":"Stopping before the bottom entry misses outer matches.","family":"w2-bidirectional-text-layout-bracket-pairs-stack-search-direction","id":"FA-80596","implementations":{"attempt":{"sha256":"89d8fde629e4e19d51b9b24e1667c7700de1458d886b15698a2bc0a214ffae20","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    text, classes, limit = x\n    OPEN = {'(': ')', '[': ']', '{': '}'}\n    CLOSE = {')', ']', '}'}\n    stack = []\n    pairs = []\n    for i, ch in enumerate(text):\n        if classes[i] != 'ON':\n            continue\n        if ch in OPEN:\n            if len(stack) >= limit:\n                break\n            stack.append((OPEN[ch], i))\n        elif ch in CLOSE:\n            for k in range(len(stack) - 1, 0, -1):\n                if stack[k][0] == ch:\n                    pairs.append([stack[k][1], i])\n                    del stack[k:]\n                    break\n    return sorted(pairs)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: stack search direction', ['{[{)}((}(((', ['ON', 'ON', 'ON', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 7], [2, 4]]), ('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('partial-repair probe', ['a)))]a([){a{a[', ['L', 'L', 'ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'R', 'R', 'ON', 'R', 'ON'], 4], [[6, 8]]), ('partial-repair probe', ['{(])([[', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L'], 2], [[1, 3]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['})({[a]}]}[([', ['R', 'R', 'ON', 'ON', 'L', 'R', 'ON', 'ON', 'L', 'ON', 'ON', 'R', 'ON'], 2], [[3, 7]])], [('regression: stack search direction', ['a((a](]())(]', ['R', 'ON', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[5, 9], [7, 8]]), ('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('partial-repair probe', ['((]]){][([[(', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'R'], 1], [[0, 4]]), ('partial-repair probe', ['(){', ['ON', 'ON', 'ON'], 4], [[0, 1]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [']]a}}a(}(((', ['ON', 'ON', 'L', 'L', 'ON', 'L', 'L', 'ON', 'ON', 'R', 'ON'], 1], []), ('control layout', ['{aa])(', ['L', 'R', 'L', 'ON', 'ON', 'ON'], 2], [])], [('regression: stack search direction', ['(a{{a}(([', ['ON', 'L', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON'], 3], [[3, 5]]), ('regression: stack search direction', ['()a}]{{)}{({(', ['R', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'L'], 3], [[6, 8]]), ('partial-repair probe', ['a()(})a({(]}', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON', 'ON'], 1], [[1, 2], [3, 5]]), ('regression: stack search direction', ['))]{{])a{})}a)', ['ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'ON', 'ON', 'R', 'ON'], 2], [[4, 11], [8, 9]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['][}({}(', ['ON', 'L', 'R', 'ON', 'L', 'ON', 'ON'], 2], []), ('control layout', ['[)aa]}{{', ['ON', 'ON', 'L', 'L', 'R', 'L', 'ON', 'ON'], 4], [])], [('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('regression: stack search direction', ['{a([a)([()][)]', ['L', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 5], [6, 12], [7, 10], [8, 9]]), ('partial-repair probe', ['aa[a]aa)()[', ['R', 'R', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'ON'], 1], [[2, 4], [8, 9]]), ('partial-repair probe', ['()([)]{a[([[', ['ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 1]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['a]}}]a[a((a', ['R', 'ON', 'R', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 2], [])], [('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('regression: stack search direction', ['}[(]]([aa()(}]', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON'], 3], [[1, 3], [6, 13], [9, 10]]), ('regression: stack search direction', [')]{(()}[[', ['R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 6], [4, 5]]), ('partial-repair probe', ['(a}[aaa[({){', ['ON', 'L', 'ON', 'L', 'L', 'L', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 3], [[0, 10]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['((', ['ON', 'R'], 3], []), ('control layout', ['][(][})[', ['ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON'], 2], [])]]\nfor label, args, expected in fixtures[N - 1]:\n    check(label, solve(args), expected)\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":"b5f35bc0cab5beda32bf7d14a3af3e25d0919ccbd761e01785925b5c88d3ecf3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    text, classes, limit = x\n    OPEN = {'(': ')', '[': ']', '{': '}'}\n    CLOSE = {')', ']', '}'}\n    stack = []\n    pairs = []\n    for i, ch in enumerate(text):\n        if classes[i] != 'ON':\n            continue\n        if ch in OPEN:\n            if len(stack) >= limit:\n                break\n            stack.append((OPEN[ch], i))\n        elif ch in CLOSE:\n            for k in range(len(stack)):\n                if stack[k][0] == ch:\n                    pairs.append([stack[k][1], i])\n                    del stack[k:]\n                    break\n    return sorted(pairs)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: stack search direction', ['{[{)}((}(((', ['ON', 'ON', 'ON', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 7], [2, 4]]), ('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('partial-repair probe', ['a)))]a([){a{a[', ['L', 'L', 'ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'R', 'R', 'ON', 'R', 'ON'], 4], [[6, 8]]), ('partial-repair probe', ['{(])([[', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L'], 2], [[1, 3]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['})({[a]}]}[([', ['R', 'R', 'ON', 'ON', 'L', 'R', 'ON', 'ON', 'L', 'ON', 'ON', 'R', 'ON'], 2], [[3, 7]])], [('regression: stack search direction', ['a((a](]())(]', ['R', 'ON', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[5, 9], [7, 8]]), ('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('partial-repair probe', ['((]]){][([[(', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'R'], 1], [[0, 4]]), ('partial-repair probe', ['(){', ['ON', 'ON', 'ON'], 4], [[0, 1]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [']]a}}a(}(((', ['ON', 'ON', 'L', 'L', 'ON', 'L', 'L', 'ON', 'ON', 'R', 'ON'], 1], []), ('control layout', ['{aa])(', ['L', 'R', 'L', 'ON', 'ON', 'ON'], 2], [])], [('regression: stack search direction', ['(a{{a}(([', ['ON', 'L', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON'], 3], [[3, 5]]), ('regression: stack search direction', ['()a}]{{)}{({(', ['R', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'L'], 3], [[6, 8]]), ('partial-repair probe', ['a()(})a({(]}', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON', 'ON'], 1], [[1, 2], [3, 5]]), ('regression: stack search direction', ['))]{{])a{})}a)', ['ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'ON', 'ON', 'R', 'ON'], 2], [[4, 11], [8, 9]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['][}({}(', ['ON', 'L', 'R', 'ON', 'L', 'ON', 'ON'], 2], []), ('control layout', ['[)aa]}{{', ['ON', 'ON', 'L', 'L', 'R', 'L', 'ON', 'ON'], 4], [])], [('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('regression: stack search direction', ['{a([a)([()][)]', ['L', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 5], [6, 12], [7, 10], [8, 9]]), ('partial-repair probe', ['aa[a]aa)()[', ['R', 'R', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'ON'], 1], [[2, 4], [8, 9]]), ('partial-repair probe', ['()([)]{a[([[', ['ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 1]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['a]}}]a[a((a', ['R', 'ON', 'R', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 2], [])], [('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('regression: stack search direction', ['}[(]]([aa()(}]', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON'], 3], [[1, 3], [6, 13], [9, 10]]), ('regression: stack search direction', [')]{(()}[[', ['R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 6], [4, 5]]), ('partial-repair probe', ['(a}[aaa[({){', ['ON', 'L', 'ON', 'L', 'L', 'L', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 3], [[0, 10]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['((', ['ON', 'R'], 3], []), ('control layout', ['][(][})[', ['ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON'], 2], [])]]\nfor label, args, expected in fixtures[N - 1]:\n    check(label, solve(args), expected)\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"},"fixed":{"sha256":"8ddd0d9b03d426d96f94ba17e36ecafdc75df7d2a413d799d56af194854572ce","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    text, classes, limit = x\n    OPEN = {'(': ')', '[': ']', '{': '}'}\n    CLOSE = {')', ']', '}'}\n    stack = []\n    pairs = []\n    for i, ch in enumerate(text):\n        if classes[i] != 'ON':\n            continue\n        if ch in OPEN:\n            if len(stack) >= limit:\n                break\n            stack.append((OPEN[ch], i))\n        elif ch in CLOSE:\n            for k in range(len(stack) - 1, -1, -1):\n                if stack[k][0] == ch:\n                    pairs.append([stack[k][1], i])\n                    del stack[k:]\n                    break\n    return sorted(pairs)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: stack search direction', ['{[{)}((}(((', ['ON', 'ON', 'ON', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 7], [2, 4]]), ('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('partial-repair probe', ['a)))]a([){a{a[', ['L', 'L', 'ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'R', 'R', 'ON', 'R', 'ON'], 4], [[6, 8]]), ('partial-repair probe', ['{(])([[', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L'], 2], [[1, 3]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['})({[a]}]}[([', ['R', 'R', 'ON', 'ON', 'L', 'R', 'ON', 'ON', 'L', 'ON', 'ON', 'R', 'ON'], 2], [[3, 7]])], [('regression: stack search direction', ['a((a](]())(]', ['R', 'ON', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[5, 9], [7, 8]]), ('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('partial-repair probe', ['((]]){][([[(', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'R'], 1], [[0, 4]]), ('partial-repair probe', ['(){', ['ON', 'ON', 'ON'], 4], [[0, 1]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('control layout', [']]a}}a(}(((', ['ON', 'ON', 'L', 'L', 'ON', 'L', 'L', 'ON', 'ON', 'R', 'ON'], 1], []), ('control layout', ['{aa])(', ['L', 'R', 'L', 'ON', 'ON', 'ON'], 2], [])], [('regression: stack search direction', ['(a{{a}(([', ['ON', 'L', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON'], 3], [[3, 5]]), ('regression: stack search direction', ['()a}]{{)}{({(', ['R', 'L', 'R', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'L'], 3], [[6, 8]]), ('partial-repair probe', ['a()(})a({(]}', ['L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON', 'ON'], 1], [[1, 2], [3, 5]]), ('regression: stack search direction', ['))]{{])a{})}a)', ['ON', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'ON', 'ON', 'R', 'ON'], 2], [[4, 11], [8, 9]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['][}({}(', ['ON', 'L', 'R', 'ON', 'L', 'ON', 'ON'], 2], []), ('control layout', ['[)aa]}{{', ['ON', 'ON', 'L', 'L', 'R', 'L', 'ON', 'ON'], 4], [])], [('regression: stack search direction', ['{[a){([a(][{((', ['L', 'ON', 'R', 'R', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[6, 9]]), ('regression: stack search direction', ['{a([a)([()][)]', ['L', 'R', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 5], [6, 12], [7, 10], [8, 9]]), ('partial-repair probe', ['aa[a]aa)()[', ['R', 'R', 'ON', 'L', 'ON', 'R', 'R', 'ON', 'ON', 'ON', 'ON'], 1], [[2, 4], [8, 9]]), ('partial-repair probe', ['()([)]{a[([[', ['ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'R', 'ON', 'ON', 'ON', 'ON'], 4], [[0, 1]]), ('overridden bracket ignored', ['(a)', ['R', 'L', 'ON'], 4], []), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('control layout', [')a(', ['ON', 'R', 'ON'], 3], []), ('control layout', ['a]}}]a[a((a', ['R', 'ON', 'R', 'ON', 'ON', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 2], [])], [('regression: stack search direction', [')}})((([a))}{)', ['ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'ON', 'ON', 'L', 'ON', 'ON'], 4], [[4, 13], [5, 10], [6, 9]]), ('regression: stack search direction', ['}[(]]([aa()(}]', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'L', 'L', 'ON', 'ON', 'ON', 'ON', 'ON'], 3], [[1, 3], [6, 13], [9, 10]]), ('regression: stack search direction', [')]{(()}[[', ['R', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 4], [[2, 6], [4, 5]]), ('partial-repair probe', ['(a}[aaa[({){', ['ON', 'L', 'ON', 'L', 'L', 'L', 'L', 'ON', 'R', 'ON', 'ON', 'R'], 3], [[0, 10]]), ('mismatched inner bracket', ['([)]', ['ON', 'ON', 'ON', 'ON'], 4], [[0, 2]]), ('stack overflow stops', ['((()))', ['ON', 'ON', 'ON', 'ON', 'ON', 'ON'], 2], []), ('control layout', ['((', ['ON', 'R'], 3], []), ('control layout', ['][(][})[', ['ON', 'ON', 'ON', 'L', 'ON', 'L', 'ON', 'ON'], 2], [])]]\nfor label, args, expected in fixtures[N - 1]:\n    check(label, solve(args), expected)\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":"A deterministic toy bidi model over stipulated class labels and integer levels; it is inspired by, but does not claim conformance to, any published algorithm. 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":"w2-bidirectional-text-layout-bracket-pairs-stack-search-direction","generated_at":"2026-09-29T14:49:55.469593+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Mixed right-to-left and left-to-right text must resolve levels and visual order exactly, or words, numbers and carets land in the wrong place.","repair":"Search from the top of the stack.","root_cause":"The stack is searched from the bottom.","sha256":"166284c56150775e54ce2b27dc34182d49a3b3384feca2039594d2bd8f94f525","title":"Bracket pair identification: stack search direction · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":39.073,"exit_code":1,"observations":[{"actual":[[2,4]],"check":"regression: stack search direction","expected":[[0,7],[2,4]],"passed":false},{"actual":[[5,10],[6,9]],"check":"regression: stack search direction","expected":[[4,13],[5,10],[6,9]],"passed":false},{"actual":[],"check":"partial-repair probe","expected":[[6,8]],"passed":false},{"actual":[],"check":"partial-repair probe","expected":[[1,3]],"passed":false},{"actual":[[1,3]],"check":"mismatched inner bracket","expected":[[0,2]],"passed":false},{"actual":[],"check":"overridden bracket ignored","expected":[],"passed":true},{"actual":[],"check":"control layout","expected":[],"passed":true},{"actual":[[3,7]],"check":"control layout","expected":[[3,7]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: stack search direction\", \"actual\": [[2, 4]], \"expected\": [[0, 7], [2, 4]], \"passed\": false}, {\"check\": \"regression: stack search direction\", \"actual\": [[5, 10], [6, 9]], \"expected\": [[4, 13], [5, 10], [6, 9]], \"passed\": false}, {\"check\": \"partial-repair probe\", \"actual\": [], \"expected\": [[6, 8]], \"passed\": false}, {\"check\": \"partial-repair probe\", \"actual\": [], \"expected\": [[1, 3]], \"passed\": false}, {\"check\": \"mismatched inner bracket\", \"actual\": [[1, 3]], \"expected\": [[0, 2]], \"passed\": false}, {\"check\": \"overridden bracket ignored\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"control layout\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"control layout\", \"actual\": [[3, 7]], \"expected\": [[3, 7]], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.833,"exit_code":1,"observations":[{"actual":[[0,4]],"check":"regression: stack search direction","expected":[[0,7],[2,4]],"passed":false},{"actual":[[4,9]],"check":"regression: stack search direction","expected":[[4,13],[5,10],[6,9]],"passed":false},{"actual":[[6,8]],"check":"partial-repair probe","expected":[[6,8]],"passed":true},{"actual":[[1,3]],"check":"partial-repair probe","expected":[[1,3]],"passed":true},{"actual":[[0,2]],"check":"mismatched inner bracket","expected":[[0,2]],"passed":true},{"actual":[],"check":"overridden bracket ignored","expected":[],"passed":true},{"actual":[],"check":"control layout","expected":[],"passed":true},{"actual":[[3,7]],"check":"control layout","expected":[[3,7]],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: stack search direction\", \"actual\": [[0, 4]], \"expected\": [[0, 7], [2, 4]], \"passed\": false}, {\"check\": \"regression: stack search direction\", \"actual\": [[4, 9]], \"expected\": [[4, 13], [5, 10], [6, 9]], \"passed\": false}, {\"check\": \"partial-repair probe\", \"actual\": [[6, 8]], \"expected\": [[6, 8]], \"passed\": true}, {\"check\": \"partial-repair probe\", \"actual\": [[1, 3]], \"expected\": [[1, 3]], \"passed\": true}, {\"check\": \"mismatched inner bracket\", \"actual\": [[0, 2]], \"expected\": [[0, 2]], \"passed\": true}, {\"check\": \"overridden bracket ignored\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"control layout\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"control layout\", \"actual\": [[3, 7]], \"expected\": [[3, 7]], \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":40.954,"exit_code":0,"observations":[{"actual":[[0,7],[2,4]],"check":"regression: stack search direction","expected":[[0,7],[2,4]],"passed":true},{"actual":[[4,13],[5,10],[6,9]],"check":"regression: stack search direction","expected":[[4,13],[5,10],[6,9]],"passed":true},{"actual":[[6,8]],"check":"partial-repair probe","expected":[[6,8]],"passed":true},{"actual":[[1,3]],"check":"partial-repair probe","expected":[[1,3]],"passed":true},{"actual":[[0,2]],"check":"mismatched inner 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\"passed\": true}, {\"check\": \"control layout\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"control layout\", \"actual\": [[3, 7]], \"expected\": [[3, 7]], \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}