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Expanding tree edit similarity to different languages (#128) #128

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92 changes: 86 additions & 6 deletions privacy_guard/analysis/tests/test_tree_edit_distance_node.py
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Original file line number Diff line number Diff line change
Expand Up @@ -115,28 +115,108 @@ def test_similarity_values(self) -> None:
output = _run_e2e(df)
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

def test_java_similarity(self) -> None:
"""Identical Java code yields ~1.0; structurally similar code is high."""
with self.subTest("identical"):
code = "class Foo { int add(int a, int b) { return a + b; } }"
df = pd.DataFrame(
{
"target_code_string": [code],
"model_generated_code_string": [code],
}
)
output = _run_e2e(df, default_language="java")
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

with self.subTest("similar"):
df = pd.DataFrame(
{
"target_code_string": [
"class Foo { int add(int a, int b) { return a + b; } }"
],
"model_generated_code_string": [
"class Bar { int sum(int x, int y) { return x + y; } }"
],
}
)
output = _run_e2e(df, default_language="java")
self.assertGreater(output.avg_similarity, 0.7)

def test_c_similarity(self) -> None:
"""Identical C code yields ~1.0."""
code = "int add(int a, int b) { return a + b; }"
df = pd.DataFrame(
{
"target_code_string": [code],
"model_generated_code_string": [code],
}
)
output = _run_e2e(df, default_language="c")
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

def test_rust_similarity(self) -> None:
"""Identical Rust code yields ~1.0."""
code = "fn add(a: i32, b: i32) -> i32 { a + b }"
df = pd.DataFrame(
{
"target_code_string": [code],
"model_generated_code_string": [code],
}
)
output = _run_e2e(df, default_language="rust")
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

def test_ruby_similarity(self) -> None:
"""Identical Ruby code yields ~1.0."""
code = "def add(a, b)\n a + b\nend"
df = pd.DataFrame(
{
"target_code_string": [code],
"model_generated_code_string": [code],
}
)
output = _run_e2e(df, default_language="ruby")
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

def test_c_sharp_similarity(self) -> None:
"""Identical C# code yields ~1.0."""
code = "class Foo { int Add(int a, int b) { return a + b; } }"
df = pd.DataFrame(
{
"target_code_string": [code],
"model_generated_code_string": [code],
}
)
output = _run_e2e(df, default_language="c_sharp")
self.assertAlmostEqual(output.avg_similarity, 1.0, places=5)

def test_avg_similarity_by_language(self) -> None:
"""Mixed Python+C++ input produces per-language averages."""
"""Mixed multi-language input produces per-language averages."""
df = pd.DataFrame(
{
"target_code_string": [
"def foo():\n return 1\n",
"int main() { return 0; }",
"class Foo { int add(int a, int b) { return a + b; } }",
"fn add(a: i32, b: i32) -> i32 { a + b }",
"int add(int a, int b) { return a + b; }",
],
"model_generated_code_string": [
"def foo():\n return 1\n",
"int main() { return 0; }",
"class Foo { int add(int a, int b) { return a + b; } }",
"fn add(a: i32, b: i32) -> i32 { a + b }",
"int add(int a, int b) { return a + b; }",
],
"language": ["python", "cpp"],
"language": ["python", "cpp", "java", "rust", "c"],
}
)
output = _run_e2e(df)
assert output.avg_similarity_by_language is not None
by_lang = output.avg_similarity_by_language
self.assertIn("python", by_lang)
self.assertIn("cpp", by_lang)
self.assertAlmostEqual(by_lang["python"], 1.0, places=5)
self.assertAlmostEqual(by_lang["cpp"], 1.0, places=5)
for lang in ["python", "cpp", "java", "rust", "c"]:
self.assertIn(lang, by_lang)
self.assertAlmostEqual(by_lang[lang], 1.0, places=5)

def test_compute_similarity_static_method(self) -> None:
"""TreeEditDistanceNode.compute_similarity works standalone."""
Expand Down
61 changes: 23 additions & 38 deletions privacy_guard/attacks/code_similarity/py_tree_sitter_attack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,14 +14,14 @@

# pyre-strict

import ctypes
import importlib.resources
import logging
from types import ModuleType
from typing import Any

import pandas as pd
import tree_sitter_cpp # @manual=fbsource//third-party/pypi/tree-sitter-cpp:tree-sitter-cpp
import tree_sitter_python # @manual=fbsource//third-party/pypi/tree-sitter-python:tree-sitter-python
from codebleu.codebleu import ( # @manual=fbsource//third-party/pypi/codebleu:codebleu
AVAILABLE_LANGS,
)
from privacy_guard.analysis.code_similarity.code_similarity_analysis_input import (
CodeSimilarityAnalysisInput,
)
Expand All @@ -38,57 +38,42 @@

logger: logging.Logger = logging.getLogger(__name__)

# Maps user-facing language strings to tree-sitter language modules.
_LANGUAGE_REGISTRY: dict[str, ModuleType] = {
"python": tree_sitter_python,
"py": tree_sitter_python,
"c++": tree_sitter_cpp,
"cpp": tree_sitter_cpp,
# Aliases that map to canonical codebleu language names.
_LANGUAGE_ALIASES: dict[str, str] = {
"py": "python",
"c++": "cpp",
"js": "javascript",
}


def _language_from_capsule(ts_module: ModuleType) -> Language:
"""Create a tree-sitter Language from a language module's capsule.

tree-sitter 0.20.4 expects ``Language(library_path, name)`` but the
modern language packages (tree-sitter-python, tree-sitter-cpp) expose
a ``language()`` function returning a PyCapsule. We extract the raw
pointer from the capsule and construct a Language-compatible object.
"""
capsule = ts_module.language() # type: ignore[attr-defined]
ctypes.pythonapi.PyCapsule_GetPointer.restype = ctypes.c_void_p
ctypes.pythonapi.PyCapsule_GetPointer.argtypes = [ctypes.py_object, ctypes.c_char_p]
language_id: ctypes.c_void_p = ctypes.pythonapi.PyCapsule_GetPointer(
capsule, b"tree_sitter.Language"
)
lang = Language.__new__(Language)
lang.language_id = language_id # type: ignore[attr-defined]
return lang
SUPPORTED_LANGS: list[str] = AVAILABLE_LANGS


def _get_parser(language: str) -> Parser: # pyre-ignore[11]
"""Create a tree-sitter Parser for the given language.

Uses the grammar bundled in the ``codebleu`` package (``my-languages.so``)
which supports: java, javascript, c_sharp, php, c, cpp, python, go, ruby, rust.

Args:
language: a key in _LANGUAGE_REGISTRY (e.g. "python", "cpp")
language: a language name from ``codebleu.AVAILABLE_LANGS``,
or an alias (e.g. "py", "c++", "js").

Returns:
A configured tree-sitter Parser instance.

Raises:
ValueError: if the language is not supported.
"""
lang_key = language.lower()
ts_module = _LANGUAGE_REGISTRY.get(lang_key)
if ts_module is None:
lang_key = _LANGUAGE_ALIASES.get(language.lower(), language.lower())
if lang_key not in AVAILABLE_LANGS:
raise ValueError(
f"Unsupported language '{language}'. "
f"Supported: {sorted(_LANGUAGE_REGISTRY.keys())}"
f"Unsupported language '{language}'. Supported: {sorted(AVAILABLE_LANGS)}"
)

ts_language = _language_from_capsule(ts_module)
parser = Parser() # pyre-ignore[16]
# pyre-ignore[16]: Module `tree_sitter` has no attribute `Parser`
ts_language = Language(
importlib.resources.files("codebleu") / "my-languages.so", lang_key
)
# pyre-ignore[16]: Module `tree_sitter` has no attribute `Parser`.
parser = Parser()
parser.set_language(ts_language)
return parser

Expand Down
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