import traceback
from contextlib import contextmanager
from typing import List, Any, Dict
from ._compatibility import compatibility
__all__ = ['preserve_node_meta', 'has_preserved_node_meta',
'set_stack_trace', 'format_stack',
'set_current_meta', 'get_current_meta']
current_meta: Dict[str, Any] = {}
should_preserve_node_meta = False
@compatibility(is_backward_compatible=False)
@contextmanager
def preserve_node_meta():
global should_preserve_node_meta
saved_should_preserve_node_meta = should_preserve_node_meta
try:
should_preserve_node_meta = True
yield
finally:
should_preserve_node_meta = saved_should_preserve_node_meta
@compatibility(is_backward_compatible=False)
def set_stack_trace(stack : List[str]):
global current_meta
if should_preserve_node_meta and stack:
current_meta["stack_trace"] = "".join(stack)
@compatibility(is_backward_compatible=False)
def format_stack() -> List[str]:
if should_preserve_node_meta:
return [current_meta.get("stack_trace", "")]
else:
# fallback to traceback.format_stack()
return traceback.format_list(traceback.extract_stack()[:-1])
@compatibility(is_backward_compatible=False)
def has_preserved_node_meta() -> bool:
return should_preserve_node_meta
@compatibility(is_backward_compatible=False)
@contextmanager
def set_current_meta(meta : Dict[str, Any]):
global current_meta
if should_preserve_node_meta and meta:
saved_meta = current_meta
try:
current_meta = meta
yield
finally:
current_meta = saved_meta
else:
yield
@compatibility(is_backward_compatible=False)
def get_current_meta() -> Dict[str, Any]:
return current_meta.copy()