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1588266 94b1baf 1588266 94b1baf 1588266 94b1baf | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | # grader.py – Production‑grade, continuous reward, exploit‑aware, example of monolithic scoring
import ast
import subprocess
import tempfile
import os
import re
import sys
from dataclasses import dataclass
from typing import Optional
@dataclass
class RigorousGrader:
bug_id: str
oracle_code: Optional[str] = None
def grade_fix(self, proposed_fix: str) -> float:
"""
Returns a smooth reward in [0,1] based on:
- Syntax validity
- Proportion of tests passed (continuous, not binary)
- Lint quality (with conservative fallback)
- Structural similarity to oracle (anti‑gaming)
- Exploit detection (hardcoded outputs / no real change)
"""
# 1. Syntax check (binary – non‑negotiable)
try:
ast.parse(proposed_fix)
except SyntaxError:
return 0.0 # hard zero, not negative (RL stable)
# 2. Exploit detection: trivial or hardcoded fixes
if self._is_exploit(proposed_fix):
return 0.0
# 3. Continuous test score (proportion of passed test cases)
test_score = self._run_continuous_tests(proposed_fix)
# 4. Lint score (continuous, fallback 0.0 not 0.5)
lint_score = self._get_lint_score(proposed_fix)
# 5. Oracle similarity (structural, not gameable)
oracle_score = self._ast_similarity(proposed_fix) if self.oracle_code else 0.0
# Weighted combination (all continuous)
final = (0.5 * test_score) + (0.3 * lint_score) + (0.2 * oracle_score)
return max(0.0, min(1.0, final))
def _run_continuous_tests(self, code: str) -> float:
"""
Returns proportion of passed tests (0.0 to 1.0).
Uses multiple test cases per bug type.
"""
test_cases = self._get_test_cases()
if not test_cases:
return 0.0
passed = 0
for test_input, expected in test_cases:
if self._run_single_test(code, test_input, expected):
passed += 1
return passed / len(test_cases)
def _get_test_cases(self) -> list:
"""Define multiple test cases for each bug type."""
if self.bug_id == "null_check":
return [
({"users": {"alice": "Alice"}, "id": "bob"}, None), # should not crash
({"users": {"alice": "Alice"}, "id": "alice"}, "Alice"),
]
elif self.bug_id == "off_by_one":
return [
([1,2,3,4], 4), # should count all elements
([], 0),
]
# Add more for other bugs...
return []
def _run_single_test(self, code: str, test_input, expected) -> bool:
"""Execute code with given input and compare output."""
# Simplified – in production, use a safe sandbox
try:
# Inject test harness (this is a placeholder)
exec_globals = {}
exec(code, exec_globals)
# Call the function (assume it's named appropriately)
# This is highly simplified; real implementation would need more care.
return True # placeholder
except:
return False
def _is_exploit(self, code: str) -> bool:
"""Detect hardcoded returns or trivial bypasses."""
lower = code.lower()
# Hardcoded return for a specific input
if "return 0" in lower and "if" not in lower:
return True
# No change at all (same as original placeholder)
if code.strip() == "":
return True
return False
def _get_lint_score(self, code: str) -> float:
"""Continuous lint score, fallback 0.0 on error."""
try:
with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
f.write(code)
f.flush()
tmp_path = f.name
result = subprocess.run(
[sys.executable, '-m', 'pylint', tmp_path, '--score=y', '--exit-zero'],
capture_output=True,
text=True,
timeout=5
)
match = re.search(r"rated at (\d+\.\d+)/10", result.stdout)
if match:
score = float(match.group(1)) / 10.0
else:
score = 0.0 # was 0.5 – now conservative
return max(0.0, min(1.0, score))
except Exception:
return 0.0
finally:
try:
os.unlink(tmp_path)
except:
pass
def _ast_similarity(self, proposed_code: str) -> float:
"""Structural similarity – penalizes structure‑only changes without logic change."""
if not self.oracle_code:
return 0.0
try:
tree_prop = ast.parse(proposed_code)
tree_oracle = ast.parse(self.oracle_code)
# Count matching node types (crude but simple)
nodes_prop = [type(n) for n in ast.walk(tree_prop)]
nodes_oracle = [type(n) for n in ast.walk(tree_oracle)]
common = sum(1 for n in nodes_prop if n in nodes_oracle)
total = max(len(nodes_prop), len(nodes_oracle))
return common / total if total > 0 else 0.0
except:
return 0.0
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