hangshuo652
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
from dataclasses import dataclass
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from decimal import Decimal, InvalidOperation
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@dataclass
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class RoundingResult:
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mode: str = "EXACT"
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confidence: float = 1.0
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suggestion: str = ""
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def detect_rounding(cobol_value: str, java_value: str) -> RoundingResult:
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c = _to_decimal(cobol_value)
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j = _to_decimal(java_value)
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if c is None or j is None:
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return RoundingResult(mode="UNKNOWN", confidence=0.0, suggestion="cannot parse values")
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if c == j:
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return RoundingResult(mode="EXACT", confidence=1.0, suggestion="values are identical")
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diff = abs(float(c - j))
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magnitude = max(abs(float(c)), abs(float(j)), 1.0)
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relative_diff = diff / magnitude
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if diff < 2.0:
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mode = "TRUNCATE"
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confidence = 0.6
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suggestion = f"Likely TRUNCATE rounding: COBOL truncates, Java rounds or retains precision. Diff: {diff}"
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elif diff < 100.0:
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mode = "ROUNDING"
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confidence = 0.4
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suggestion = f"Possible rounding difference. Diff: {diff}"
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else:
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mode = "SIGNIFICANT"
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confidence = 0.9
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suggestion = f"Values differ significantly (diff={diff}) — not a rounding issue"
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return RoundingResult(mode=mode, confidence=confidence, suggestion=suggestion)
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def _to_decimal(val: str):
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try:
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return Decimal(str(val).strip())
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except (InvalidOperation, ValueError):
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return None
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