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"""Analyze definition.""" |
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from inspect import getclosurevars |
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from typing import Any, Callable, List, NamedTuple, Optional, Tuple, no_type_check |
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from .definition import CallableFunction, NodeMetadata |
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__all__ = ["analyze", "stringify_analyze", "Node"] |
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class Node(NamedTuple): |
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"""Node aggregate node definition implemented with NamedTuple. |
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A Node is used to keep information on name, properties, and relations ship |
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between a hierachical construct of functions. |
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It's like an instance of NodeMetadata. |
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Attributes: |
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name (str): named operation. |
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properties (List[Tuple[str, Any]]): a list of tuple (name, value) for definition. |
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edges (List[Tuple[str, List[Any]]]): a list of tuple (name, node list) for |
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definition. |
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Notes: |
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Edges attribut should be edges: ```List[Tuple[str, List['Node']]]``` |
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But it is impossible for now, see [mypy issues 731](https://github.com/python/mypy/issues/731) |
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""" |
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name: str |
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properties: List[Tuple[str, Any]] |
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# edges: List[Tuple[str, List['Node']]] |
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# https://github.com/python/mypy/issues/731 |
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edges: List[Tuple[str, List[Any]]] |
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def __str__(self): |
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return stringify_analyze(target=self) |
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def _get_analyze_edges(nonlocals) -> Callable: |
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return _get_analyze_edges |
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@no_type_check |
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def _get_node_metadata(target: CallableFunction) -> NodeMetadata: |
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"""Returns node metadata instance associated with target.""" |
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node = target.__node_metadata |
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if not isinstance(node, NodeMetadata): |
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raise RuntimeError(f'attr __node_metadata of {target} is not a NodeMetadata!') |
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return node |
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# pylint: disable=protected-access |
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@no_type_check # it's a shortcut for hasattr ... |
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def analyze(target: CallableFunction) -> Node: |
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"""Analyze specified target and return a Node representation. |
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Args: |
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target (CallableFunction): async function to analyze. |
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Returns: |
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(Node): a node instance representation of target function |
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""" |
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nonlocals = getclosurevars(target).nonlocals |
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def _get_nonlocals_value_for(name): |
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return nonlocals[name] if name in nonlocals else None |
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def _analyze_property(p): |
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"""Return a tuple (name, value) or (name, function name) as property.""" |
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value = _get_nonlocals_value_for(name=p) |
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return p, value.__name__ if value and callable(value) else value |
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def _analyze_edges(egde_name): |
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"""Lookup children node from egde_name local var.""" |
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value = None |
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edge = _get_nonlocals_value_for(name=egde_name) |
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if edge: |
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# it could be a collection of node |
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if hasattr(edge, "__iter__"): |
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value = list(map(analyze, edge)) |
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else: # or a single node |
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value = [analyze(edge)] |
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return (egde_name, value) |
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if hasattr(target, "__node_metadata"): |
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node = _get_node_metadata(target=target) |
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return Node( |
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name=node.name, |
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properties=list(map(_analyze_property, node.properties)), |
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edges=list(filter(lambda p: p is not None, map(_analyze_edges, node.edges))), |
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) |
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# simple function |
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return Node( |
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name=target.__name__.lstrip("_") if hasattr(target, "__name__") else "anonymous", |
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properties=list(map(_analyze_property, nonlocals.keys())), |
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edges=[], |
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) |
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def stringify_analyze(target: Node, indent: int = 0, label: Optional[str] = None) -> str: |
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"""Stringify node representation of specified target. |
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Args: |
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target (CallableFunction): async function to analyze. |
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indent (int): level identation (default to zero). |
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label (Optional[str]): label of current node (default None). |
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Returns: |
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(str): a string node representation. |
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""" |
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_ident = ' ' |
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_space = f'{_ident * indent} ' |
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result: str = '' |
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if label: |
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result += f'{_space}--({label})--> {target.name}:\n' |
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_space += f"{_ident}{' ' * len(label)}" |
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else: |
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result += f'{_space}--> {target.name}:\n' |
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for k, v in target.properties: |
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result += f'{_space} {k}: {v}\n' |
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for _label, children in target.edges: |
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if children: |
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for child in children: |
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result += stringify_analyze(target=child, indent=indent + 1, label=_label) |
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return result |
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geronimo-iia /
async-btree
