v1: executing-plans 模式生成，54 文件 1320 行 Python

comparator/rounding_detect.py

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