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Copy pathparser_loader.py
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500 lines (430 loc) · 17.1 KB
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import importlib
import subprocess
import sys
import threading
from collections.abc import Callable, Iterator, Mapping
from copy import deepcopy
from pathlib import Path
from loguru import logger
from tree_sitter import Language, Parser, Query
from . import constants as cs
from . import exceptions as ex
from . import logs as ls
from .language_spec import LANGUAGE_SPECS, LanguageSpec
from .types_defs import LanguageImport, LanguageLoader, LanguageQueries
def _try_load_from_submodule(lang_name: cs.SupportedLanguage) -> LanguageLoader:
submodule_path = Path(cs.GRAMMARS_DIR) / f"{cs.TREE_SITTER_PREFIX}{lang_name}"
python_bindings_path = (
submodule_path / cs.BINDINGS_DIR / cs.SupportedLanguage.PYTHON
)
if not python_bindings_path.exists():
return None
python_bindings_str = str(python_bindings_path)
try:
if python_bindings_str not in sys.path:
sys.path.insert(0, python_bindings_str)
try:
module_name = f"{cs.TREE_SITTER_MODULE_PREFIX}{lang_name.replace('-', '_')}"
setup_py_path = submodule_path / cs.SETUP_PY
if setup_py_path.exists():
logger.debug(ls.BUILDING_BINDINGS, lang=lang_name)
result = subprocess.run(
[sys.executable, cs.SETUP_PY, cs.BUILD_EXT_CMD, cs.INPLACE_FLAG],
check=False,
cwd=str(submodule_path),
capture_output=True,
text=True,
)
if result.returncode != 0:
logger.debug(
ls.BUILD_FAILED,
lang=lang_name,
stdout=result.stdout,
stderr=result.stderr,
)
return None
logger.debug(ls.BUILD_SUCCESS, lang=lang_name)
logger.debug(ls.IMPORTING_MODULE, module=module_name)
module = importlib.import_module(module_name)
language_attrs: list[str] = [
cs.QUERY_LANGUAGE,
f"{cs.LANG_ATTR_PREFIX}{lang_name}",
f"{cs.LANG_ATTR_PREFIX}{lang_name.replace('-', '_')}",
]
for attr_name in language_attrs:
if hasattr(module, attr_name):
logger.debug(
ls.LOADED_FROM_SUBMODULE, lang=lang_name, attr=attr_name
)
loader: LanguageLoader = getattr(module, attr_name)
return loader
logger.debug(ls.NO_LANG_ATTR, module=module_name, available=dir(module))
finally:
if python_bindings_str in sys.path:
sys.path.remove(python_bindings_str)
except Exception as e:
logger.debug(ls.SUBMODULE_LOAD_FAILED, lang=lang_name, error=e)
return None
def _try_import_language(
module_path: str, attr_name: str, lang_name: cs.SupportedLanguage
) -> LanguageLoader:
# AttributeError covers a pip package too old to export the requested
# grammar variant (tree_sitter_typescript without language_tsx); fall
# back rather than crash parser init.
try:
module = importlib.import_module(module_path)
loader: LanguageLoader = getattr(module, attr_name)
return loader
except (ImportError, AttributeError):
return _try_load_from_submodule(lang_name)
def _language_imports() -> list[LanguageImport]:
language_imports: list[LanguageImport] = [
LanguageImport(
cs.SupportedLanguage.PYTHON,
cs.TreeSitterModule.PYTHON,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.PYTHON,
),
LanguageImport(
cs.SupportedLanguage.JS,
cs.TreeSitterModule.JS,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.JS,
),
LanguageImport(
cs.SupportedLanguage.TS,
cs.TreeSitterModule.TS,
cs.LANG_ATTR_TYPESCRIPT,
cs.SupportedLanguage.TS,
),
# Same pip package ships both grammar variants; .tsx needs the tsx
# one or JSX parses as an ERROR forest. The submodule name is TSX on
# purpose: no grammars/tree-sitter-tsx exists, so a too-old pip
# package leaves TSX unavailable, not bound to the wrong grammar.
LanguageImport(
cs.SupportedLanguage.TSX,
cs.TreeSitterModule.TS,
cs.LANG_ATTR_TSX,
cs.SupportedLanguage.TSX,
),
LanguageImport(
cs.SupportedLanguage.RUST,
cs.TreeSitterModule.RUST,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.RUST,
),
LanguageImport(
cs.SupportedLanguage.GO,
cs.TreeSitterModule.GO,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.GO,
),
LanguageImport(
cs.SupportedLanguage.SCALA,
cs.TreeSitterModule.SCALA,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.SCALA,
),
LanguageImport(
cs.SupportedLanguage.JAVA,
cs.TreeSitterModule.JAVA,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.JAVA,
),
LanguageImport(
cs.SupportedLanguage.C,
cs.TreeSitterModule.C,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.C,
),
LanguageImport(
cs.SupportedLanguage.CPP,
cs.TreeSitterModule.CPP,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.CPP,
),
LanguageImport(
cs.SupportedLanguage.LUA,
cs.TreeSitterModule.LUA,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.LUA,
),
LanguageImport(
cs.SupportedLanguage.PHP,
cs.TreeSitterModule.PHP,
cs.LANG_ATTR_PHP,
cs.SupportedLanguage.PHP,
),
LanguageImport(
cs.SupportedLanguage.CSHARP,
cs.TreeSitterModule.CSHARP,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.CSHARP,
),
LanguageImport(
cs.SupportedLanguage.DART,
cs.TreeSitterModule.DART,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.DART,
),
LanguageImport(
cs.SupportedLanguage.SQL,
cs.TreeSitterModule.SQL,
cs.QUERY_LANGUAGE,
cs.SupportedLanguage.SQL,
),
]
return language_imports
_IMPORT_SPECS: dict[cs.SupportedLanguage, LanguageImport] = {
lang_import.lang_key: lang_import for lang_import in _language_imports()
}
_loader_cache: dict[cs.SupportedLanguage, LanguageLoader] = {}
def _get_language_library(lang_name: cs.SupportedLanguage) -> LanguageLoader:
# One grammar module import per language, on first use, cached for the
# process (issue #68: importing all 14 grammars up front made every
# startup pay for languages the repo does not contain).
if lang_name in _loader_cache:
return _loader_cache[lang_name]
lang_import = _IMPORT_SPECS.get(lang_name)
if lang_import is not None:
loader = _try_import_language(
lang_import.module_path,
lang_import.attr_name,
lang_import.submodule_name,
)
else:
loader = _try_load_from_submodule(lang_name)
_loader_cache[lang_name] = loader
return loader
def _build_query_pattern(node_types: tuple[str, ...], capture_name: str) -> str:
return " ".join([f"({node_type}) @{capture_name}" for node_type in node_types])
def _get_locals_pattern(lang_name: cs.SupportedLanguage) -> str | None:
match lang_name:
case cs.SupportedLanguage.JS:
return cs.JS_LOCALS_PATTERN
case cs.SupportedLanguage.TS | cs.SupportedLanguage.TSX:
return cs.TS_LOCALS_PATTERN
case _:
return None
def _build_combined_import_pattern(lang_config: LanguageSpec) -> str:
import_patterns = _build_query_pattern(
lang_config.import_node_types, cs.CAPTURE_IMPORT
)
import_from_patterns = _build_query_pattern(
lang_config.import_from_node_types, cs.CAPTURE_IMPORT_FROM
)
all_patterns: list[str] = []
if import_patterns.strip():
all_patterns.append(import_patterns)
if import_from_patterns.strip() and import_from_patterns != import_patterns:
all_patterns.append(import_from_patterns)
return " ".join(all_patterns)
def _create_optional_query(language: Language, pattern: str | None) -> Query | None:
return Query(language, pattern) if pattern else None
def _create_locals_query(
language: Language, lang_name: cs.SupportedLanguage
) -> Query | None:
locals_pattern = _get_locals_pattern(lang_name)
if not locals_pattern:
return None
try:
return Query(language, locals_pattern)
except Exception as e:
logger.debug(ls.LOCALS_QUERY_FAILED, lang=lang_name, error=e)
return None
def _create_highlights_query(
language: Language, lang_name: cs.SupportedLanguage
) -> Query | None:
query_str = ""
# TSX shares the TypeScript grammar for highlights
query_lang_name = (
cs.SupportedLanguage.TS if lang_name == cs.SupportedLanguage.TSX else lang_name
)
try:
module_name = (
f"{cs.TREE_SITTER_MODULE_PREFIX}{query_lang_name.replace('-', '_')}"
)
module = importlib.import_module(module_name)
if hasattr(module, "HIGHLIGHTS_QUERY"):
query_str = module.HIGHLIGHTS_QUERY
except Exception as e:
logger.debug(
f"Failed to load standard highlights query for {query_lang_name}: {e}"
)
try:
fallback_path = (
Path(__file__).parent / "queries" / "highlights" / f"{query_lang_name}.scm"
)
if fallback_path.exists():
custom_queries = fallback_path.read_text(encoding="utf-8")
query_str = (
query_str + "\n" + custom_queries if query_str else custom_queries
)
if query_str:
return Query(language, query_str)
except Exception as e:
logger.debug(
f"Failed to load fallback highlights query for {query_lang_name}: {e}"
)
return None
COMBINED_FUNC_CLASS_QUERIES: dict[cs.SupportedLanguage, Query | None] = {}
COMBINED_FUNC_CLASS_IMPORT_QUERIES: dict[cs.SupportedLanguage, Query | None] = {}
def _create_language_queries(
language: Language,
parser: Parser,
lang_config: LanguageSpec,
lang_name: cs.SupportedLanguage,
) -> LanguageQueries:
function_patterns = lang_config.function_query or _build_query_pattern(
lang_config.function_node_types, cs.CAPTURE_FUNCTION
)
class_patterns = lang_config.class_query or _build_query_pattern(
lang_config.class_node_types, cs.CAPTURE_CLASS
)
call_patterns = lang_config.call_query or _build_query_pattern(
lang_config.call_node_types, cs.CAPTURE_CALL
)
combined_import_patterns = _build_combined_import_pattern(lang_config)
combined_fc_pattern = f"{function_patterns} {class_patterns}".strip()
try:
COMBINED_FUNC_CLASS_QUERIES[lang_name] = (
Query(language, combined_fc_pattern) if combined_fc_pattern else None
)
except Exception:
COMBINED_FUNC_CLASS_QUERIES[lang_name] = None
combined_fci_pattern = f"{function_patterns} {class_patterns} {combined_import_patterns} {call_patterns}".strip()
try:
COMBINED_FUNC_CLASS_IMPORT_QUERIES[lang_name] = (
Query(language, combined_fci_pattern) if combined_fci_pattern else None
)
except Exception:
COMBINED_FUNC_CLASS_IMPORT_QUERIES[lang_name] = None
return LanguageQueries(
functions=_create_optional_query(language, function_patterns),
classes=_create_optional_query(language, class_patterns),
calls=_create_optional_query(language, call_patterns),
imports=_create_optional_query(language, combined_import_patterns),
locals=_create_locals_query(language, lang_name),
highlights=_create_highlights_query(language, lang_name),
config=lang_config,
language=language,
parser=parser,
)
def _process_language(
lang_name: cs.SupportedLanguage,
lang_config: LanguageSpec,
parsers: dict[cs.SupportedLanguage, Parser],
queries: dict[cs.SupportedLanguage, LanguageQueries],
) -> bool:
lang_lib = _get_language_library(lang_name)
if not lang_lib:
logger.debug(ls.LIB_NOT_AVAILABLE, lang=lang_name)
return False
try:
language = Language(lang_lib())
parser = Parser(language)
parsers[lang_name] = parser
queries[lang_name] = _create_language_queries(
language, parser, lang_config, lang_name
)
logger.success(ls.GRAMMAR_LOADED.format(lang=lang_name))
return True
except Exception as e:
# query compilation can fail AFTER the parser insert; drop the orphan
# so the store never exposes a parser without its queries
parsers.pop(lang_name, None)
logger.warning(ls.GRAMMAR_LOAD_FAILED.format(lang=lang_name, error=e))
return False
class _LazyLanguageView[V](Mapping[cs.SupportedLanguage, V]):
# A read-only Mapping over the store's per-language dict; a missing key
# triggers a one-time grammar load (issue #68). Mapping derives get,
# keys, values, items, and __contains__ from the three methods below,
# so laziness needs no dict-override tricks: membership and get load on
# demand through __getitem__, and full-view operations (iteration, len,
# and everything derived from them) probe every spec first so no
# consumer ever sees a partial availability picture.
__slots__ = ("_data", "_ensure", "_probe_all")
def __init__(
self,
data: dict[cs.SupportedLanguage, V],
ensure: Callable[[object], bool],
probe_all: Callable[[], None],
) -> None:
self._data = data
self._ensure = ensure
self._probe_all = probe_all
def __getitem__(self, lang_name: cs.SupportedLanguage) -> V:
if lang_name not in self._data:
self._ensure(lang_name)
return self._data[lang_name]
def __iter__(self) -> Iterator[cs.SupportedLanguage]:
self._probe_all()
return iter(self._data)
def __len__(self) -> int:
self._probe_all()
return len(self._data)
class _LazyGrammarStore:
# Process-wide cache: grammars load once per interpreter, not once per
# load_parsers() call (which previously recompiled EVERY language's
# query set on every call). The lock serializes loads: without it a
# thread probing a language MID-LOAD would see it in _attempted but not
# yet in the dict and wrongly report it unavailable (PR #802 review).
def __init__(self) -> None:
self._parser_data: dict[cs.SupportedLanguage, Parser] = {}
self._query_data: dict[cs.SupportedLanguage, LanguageQueries] = {}
self._attempted: set[object] = set()
self._lock = threading.Lock()
self.parsers: Mapping[cs.SupportedLanguage, Parser] = _LazyLanguageView(
self._parser_data, self._ensure, self._probe_all
)
self.queries: Mapping[cs.SupportedLanguage, LanguageQueries] = (
_LazyLanguageView(self._query_data, self._ensure, self._probe_all)
)
def _ensure(self, lang_name: object) -> bool:
# the lock-free fast path must see BOTH twin entries: the loader
# writes the parser before the queries, so a lone parser entry means
# mid-load or failed-load, not a completed language
if lang_name in self._parser_data and lang_name in self._query_data:
return True
with self._lock:
if lang_name in self._attempted:
return lang_name in self._parser_data and lang_name in self._query_data
self._attempted.add(lang_name)
if not isinstance(lang_name, str):
return False
try:
lang = cs.SupportedLanguage(lang_name)
except ValueError:
return False
spec = LANGUAGE_SPECS.get(lang)
if spec is None:
return False
return _process_language(
lang, deepcopy(spec), self._parser_data, self._query_data
)
def _probe_all(self) -> None:
for lang_key in LANGUAGE_SPECS:
self._ensure(lang_key)
if not self._parser_data:
raise RuntimeError(ex.NO_LANGUAGES)
_store: _LazyGrammarStore | None = None
_store_lock = threading.Lock()
def _reset_parser_cache() -> None:
# Test hook: discard every cached grammar so laziness can be observed
# from a clean slate.
global _store
with _store_lock:
_store = None
def load_parsers() -> tuple[
Mapping[cs.SupportedLanguage, Parser],
Mapping[cs.SupportedLanguage, LanguageQueries],
]:
global _store
store = _store
if store is None:
with _store_lock:
if _store is None:
_store = _LazyGrammarStore()
logger.info(ls.PARSERS_LAZY_READY)
store = _store
return store.parsers, store.queries