mirror of
https://github.com/Instagram/LibCST.git
synced 2025-12-23 10:35:53 +00:00
e4457425aa
This takes a tree, a matcher, and a replacement, replacing all nodes in the tree which match the shape of the matcher with the replacement.
593 lines
22 KiB
Python
593 lines
22 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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# pyre-strict
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import ast
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from dataclasses import dataclass, fields
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from typing import Generator, List, Optional, Sequence, Set, Tuple, Type, Union
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import libcst as cst
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from libcst import ensure_type, parse_expression
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from libcst.codegen.gather import all_libcst_nodes, typeclasses
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CST_DIR: Set[str] = set(dir(cst))
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class CleanseFullTypeNames(cst.CSTTransformer):
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def leave_Call(
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self, original_node: cst.Call, updated_node: cst.Call
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) -> cst.BaseExpression:
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# Convert forward ref repr back to a SimpleString.
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if isinstance(updated_node.func, cst.Name) and (
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updated_node.func.deep_equals(cst.Name("_ForwardRef"))
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or updated_node.func.deep_equals(cst.Name("ForwardRef"))
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):
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return updated_node.args[0].value
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return updated_node
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def leave_Attribute(
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self, original_node: cst.Attribute, updated_node: cst.Attribute
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) -> Union[cst.Attribute, cst.Name]:
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# Unwrap all attributes, so things like libcst.x.y.Name becomes Name
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return updated_node.attr
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def leave_Name(
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self, original_node: cst.Name, updated_node: cst.Name
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) -> Union[cst.Name, cst.SimpleString]:
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value = updated_node.value
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if value == "NoneType":
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# This is special-cased in typing, un-special case it.
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return updated_node.with_changes(value="None")
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if value in CST_DIR and not value.endswith("Sentinel"):
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# If this isn't a typing define and it isn't a builtin, convert it to
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# a forward ref string.
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return cst.SimpleString(repr(value))
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return updated_node
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def leave_SubscriptElement(
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self, original_node: cst.SubscriptElement, updated_node: cst.SubscriptElement
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) -> Union[cst.SubscriptElement, cst.RemovalSentinel]:
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slc = updated_node.slice
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if isinstance(slc, cst.Index):
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val = slc.value
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if isinstance(val, cst.Name):
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if "Sentinel" in val.value:
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# We don't support maybes in matchers.
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return cst.RemoveFromParent()
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# Simple trick to kill trailing commas
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return updated_node.with_changes(comma=cst.MaybeSentinel.DEFAULT)
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class RemoveTypesFromGeneric(cst.CSTTransformer):
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def __init__(self, values: Sequence[str]) -> None:
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self.values: Set[str] = set(values)
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def leave_SubscriptElement(
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self, original_node: cst.SubscriptElement, updated_node: cst.SubscriptElement
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) -> Union[cst.SubscriptElement, cst.RemovalSentinel]:
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slc = updated_node.slice
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if isinstance(slc, cst.Index):
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val = slc.value
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if isinstance(val, cst.Name):
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if val.value in self.values:
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# This type matches, so out it goes
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return cst.RemoveFromParent()
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return updated_node
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def _remove_types(
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oldtype: cst.BaseExpression, values: Sequence[str]
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) -> cst.BaseExpression:
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"""
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Given a BaseExpression from a type, return a new BaseExpression that does not
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refer to any types listed in values.
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"""
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return ensure_type(
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oldtype.visit(RemoveTypesFromGeneric(values)), cst.BaseExpression
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)
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class MatcherClassToLibCSTClass(cst.CSTTransformer):
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def leave_SimpleString(
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self, original_node: cst.SimpleString, updated_node: cst.SimpleString
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) -> Union[cst.SimpleString, cst.Attribute]:
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try:
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value = ast.literal_eval(updated_node.value)
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except SyntaxError:
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return updated_node
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if value in CST_DIR:
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return cst.Attribute(cst.Name("cst"), cst.Name(value))
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return updated_node
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def _convert_match_nodes_to_cst_nodes(
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matchtype: cst.BaseExpression,
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) -> cst.BaseExpression:
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"""
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Given a BaseExpression in a type, convert this to a new BaseExpression that refers
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to LibCST nodes instead of forward references to matcher nodes.
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"""
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return ensure_type(matchtype.visit(MatcherClassToLibCSTClass()), cst.BaseExpression)
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def _get_match_if_true(oldtype: cst.BaseExpression) -> cst.SubscriptElement:
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"""
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Construct a MatchIfTrue type node appropriate for going into a Union.
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"""
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return cst.SubscriptElement(
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cst.Index(
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cst.Subscript(
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cst.Name("MatchIfTrue"),
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slice=(
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cst.SubscriptElement(
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cst.Index(
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cst.Subscript(
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cst.Name("Callable"),
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slice=(
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cst.SubscriptElement(
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cst.Index(
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cst.List(
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[
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cst.Element(
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# MatchIfTrue takes in the original node type,
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# and returns a boolean. So, lets convert our
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# quoted classes (forward refs to other
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# matchers) back to the CSTNode they refer to.
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# We can do this because there's always a 1:1
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# name mapping.
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_convert_match_nodes_to_cst_nodes(
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oldtype
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)
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)
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]
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)
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)
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),
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cst.SubscriptElement(cst.Index(cst.Name("bool"))),
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),
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)
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)
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),
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),
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)
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)
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)
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def _add_generic(name: str, oldtype: cst.BaseExpression) -> cst.BaseExpression:
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return cst.Subscript(cst.Name(name), (cst.SubscriptElement(cst.Index(oldtype)),))
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class AddLogicMatchersToUnions(cst.CSTTransformer):
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def leave_Subscript(
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self, original_node: cst.Subscript, updated_node: cst.Subscript
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) -> cst.Subscript:
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if updated_node.value.deep_equals(cst.Name("Union")):
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# Take the original node, remove do not care so we have concrete types.
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# Explicitly taking the original node because we want to discard nested
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# changes.
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concrete_only_expr = _remove_types(updated_node, ["DoNotCareSentinel"])
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return updated_node.with_changes(
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slice=[
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*updated_node.slice,
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cst.SubscriptElement(
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cst.Index(_add_generic("OneOf", concrete_only_expr))
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),
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cst.SubscriptElement(
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cst.Index(_add_generic("AllOf", concrete_only_expr))
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),
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]
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)
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return updated_node
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class AddWildcardsToSequenceUnions(cst.CSTTransformer):
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def __init__(self) -> None:
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super().__init__()
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self.in_match_if_true: Set[cst.CSTNode] = set()
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self.fixup_nodes: Set[cst.Subscript] = set()
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def visit_Subscript(self, node: cst.Subscript) -> None:
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# If the current node is a MatchIfTrue, we don't want to modify it.
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if node.value.deep_equals(cst.Name("MatchIfTrue")):
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self.in_match_if_true.add(node)
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# If the direct descendant is a union, lets add it to be fixed up.
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elif node.value.deep_equals(cst.Name("Sequence")):
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if self.in_match_if_true:
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# We don't want to add AtLeastN/AtMostN inside MatchIfTrue
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# type blocks, even for sequence types.
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return
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slc = node.slice
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# TODO: We can remove the instance check after ExtSlice is deprecated.
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if not isinstance(slc, Sequence) or len(slc) != 1:
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raise Exception(
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"Unexpected number of sequence elements inside Sequence type "
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+ "annotation!"
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)
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nodeslice = slc[0].slice
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if isinstance(nodeslice, cst.Index):
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possibleunion = nodeslice.value
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if isinstance(possibleunion, cst.Subscript):
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if possibleunion.value.deep_equals(cst.Name("Union")):
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self.fixup_nodes.add(possibleunion)
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def leave_Subscript(
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self, original_node: cst.Subscript, updated_node: cst.Subscript
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) -> cst.Subscript:
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if original_node in self.in_match_if_true:
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self.in_match_if_true.remove(original_node)
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if original_node in self.fixup_nodes:
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self.fixup_nodes.remove(original_node)
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return updated_node.with_changes(
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slice=[
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*updated_node.slice,
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cst.SubscriptElement(
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cst.Index(_add_generic("AtLeastN", original_node))
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),
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cst.SubscriptElement(
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cst.Index(_add_generic("AtMostN", original_node))
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),
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]
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)
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return updated_node
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def _get_do_not_care() -> cst.SubscriptElement:
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"""
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Construct a DoNotCareSentinel entry appropriate for going into a Union.
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"""
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return cst.SubscriptElement(cst.Index(cst.Name("DoNotCareSentinel")))
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def _get_match_metadata() -> cst.SubscriptElement:
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"""
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Construct a MetadataMatchType entry appropriate for going into a Union.
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"""
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return cst.SubscriptElement(cst.Index(cst.Name("MetadataMatchType")))
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def _get_wrapped_union_type(
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node: cst.BaseExpression,
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addition: cst.SubscriptElement,
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*additions: cst.SubscriptElement,
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) -> cst.Subscript:
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"""
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Take two or more nodes, wrap them in a union type. Function signature is
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explicitly defined as taking at least one addition for type safety.
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"""
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return cst.Subscript(
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cst.Name("Union"), [cst.SubscriptElement(cst.Index(node)), addition, *additions]
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)
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# List of global aliases we've already generated, so we don't redefine types
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_global_aliases: Set[str] = set()
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@dataclass(frozen=True)
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class Alias:
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name: str
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type: str
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@dataclass(frozen=True)
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class Field:
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name: str
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type: str
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aliases: List[Alias]
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def _get_raw_name(node: cst.CSTNode) -> Optional[str]:
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if isinstance(node, cst.Name):
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return node.value
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elif isinstance(node, cst.SimpleString):
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return ast.literal_eval(node.value)
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elif isinstance(node, cst.SubscriptElement):
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return _get_raw_name(node.slice)
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elif isinstance(node, cst.Index):
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return _get_raw_name(node.value)
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else:
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return None
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def _get_alias_name(node: cst.CSTNode) -> Optional[str]:
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if isinstance(node, (cst.Name, cst.SimpleString)):
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return f"{_get_raw_name(node)}MatchType"
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elif isinstance(node, cst.Subscript):
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if node.value.deep_equals(cst.Name("Union")):
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slc = node.slice
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# TODO: This instance check can go away once we deprecate ExtSlice
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if isinstance(slc, Sequence):
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names = [_get_raw_name(s) for s in slc]
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if any(n is None for n in names):
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return None
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return "Or".join(n for n in names if n is not None) + "MatchType"
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return None
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def _wrap_clean_type(
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aliases: List[Alias], name: Optional[str], value: cst.Subscript
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) -> cst.BaseExpression:
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if name is not None:
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# We created an alias, lets use that, wrapping the alias in a do not care.
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aliases.append(Alias(name=name, type=cst.Module(body=()).code_for_node(value)))
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return _get_wrapped_union_type(cst.Name(name), _get_do_not_care())
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else:
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# Couldn't name the alias, fall back to regular node creation, add do not
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# care to the resulting type we widened.
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return value.with_changes(slice=[*value.slice, _get_do_not_care()])
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def _get_clean_type_from_expression(
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aliases: List[Alias], typecst: cst.BaseExpression
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) -> cst.BaseExpression:
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name = _get_alias_name(typecst)
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value = _get_wrapped_union_type(
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typecst, _get_match_metadata(), _get_match_if_true(typecst)
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)
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return _wrap_clean_type(aliases, name, value)
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def _maybe_fix_sequence_in_union(
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aliases: List[Alias], typecst: cst.SubscriptElement
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) -> cst.SubscriptElement:
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slc = typecst.slice
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if isinstance(slc, cst.Index):
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val = slc.value
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if isinstance(val, cst.Subscript):
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return cst.ensure_type(
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typecst.deep_replace(val, _get_clean_type_from_subscript(aliases, val)),
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cst.SubscriptElement,
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)
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return typecst
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def _get_clean_type_from_union(
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aliases: List[Alias], typecst: cst.Subscript
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) -> cst.BaseExpression:
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name = _get_alias_name(typecst)
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value = typecst.with_changes(
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slice=[
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# pyre-ignore We know .slice is a sequence. This can go away once we
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# deprecate ExtSlice.
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*[_maybe_fix_sequence_in_union(aliases, slc) for slc in typecst.slice],
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_get_match_metadata(),
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_get_match_if_true(typecst),
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]
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)
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return _wrap_clean_type(aliases, name, value)
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def _get_clean_type_from_subscript(
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aliases: List[Alias], typecst: cst.Subscript
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) -> cst.BaseExpression:
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if typecst.value.deep_equals(cst.Name("Sequence")):
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# Lets attempt to widen the sequence type and alias it.
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slc = typecst.slice
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# TODO: This instance check can go away once we deprecate ExtSlice
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if not isinstance(slc, Sequence):
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raise Exception("Logic error, expected Sequence to have children!")
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if len(slc) != 1:
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raise Exception("Logic error, Sequence shouldn't have more than one param!")
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inner_type = slc[0].slice
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if not isinstance(inner_type, cst.Index):
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raise Exception("Logic error, expecting Index for only Sequence element!")
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inner_type = inner_type.value
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if isinstance(inner_type, cst.Subscript):
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clean_inner_type = _get_clean_type_from_subscript(aliases, inner_type)
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elif isinstance(inner_type, (cst.Name, cst.SimpleString)):
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clean_inner_type = _get_clean_type_from_expression(aliases, inner_type)
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else:
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raise Exception("Logic error, unexpected type in Sequence!")
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return _get_wrapped_union_type(
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typecst.deep_replace(inner_type, clean_inner_type),
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_get_do_not_care(),
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_get_match_if_true(typecst),
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)
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# We can modify this as-is to add our extra values
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elif typecst.value.deep_equals(cst.Name("Union")):
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return _get_clean_type_from_union(aliases, typecst)
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else:
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# Don't handle other types like "Literal", just widen them.
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return _get_clean_type_from_expression(aliases, typecst)
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def _get_clean_type_and_aliases(
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typeobj: object,
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) -> Tuple[str, List[Alias]]: # noqa: C901
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"""
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Given a type object as returned by dataclasses, sanitize it and convert it
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to a type string that is appropriate for our codegen below.
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"""
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# First, get the type as a parseable expression.
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typestr = repr(typeobj)
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if typestr.startswith("<class '") and typestr.endswith("'>"):
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typestr = typestr[8:-2]
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# Now, parse the expression with LibCST.
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cleanser = CleanseFullTypeNames()
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typecst = parse_expression(typestr)
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typecst = typecst.visit(cleanser)
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aliases: List[Alias] = []
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# Now, convert the type to allow for MetadataMatchType and MatchIfTrue values.
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if isinstance(typecst, cst.Subscript):
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clean_type = _get_clean_type_from_subscript(aliases, typecst)
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elif isinstance(typecst, (cst.Name, cst.SimpleString)):
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clean_type = _get_clean_type_from_expression(aliases, typecst)
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else:
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raise Exception("Logic error, unexpected top level type!")
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# Now, insert OneOf/AllOf and MatchIfTrue into unions so we can typecheck their usage.
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# This allows us to put OneOf[SomeType] or MatchIfTrue[cst.SomeType] into any
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# spot that we would have originally allowed a SomeType.
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clean_type = ensure_type(clean_type.visit(AddLogicMatchersToUnions()), cst.CSTNode)
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# Now, insert AtMostN and AtLeastN into sequence unions, so we can typecheck
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# them. This relies on the previous OneOf/AllOf insertion to ensure that all
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# sequences we care about are Sequence[Union[<x>]].
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clean_type = ensure_type(
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clean_type.visit(AddWildcardsToSequenceUnions()), cst.CSTNode
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)
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# Finally, generate the code given a default Module so we can spit it out.
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return cst.Module(body=()).code_for_node(clean_type), aliases
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def _get_fields(node: Type[cst.CSTNode]) -> Generator[Field, None, None]:
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"""
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Given a CSTNode, generate a field name and type string for each.
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"""
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for field in fields(node) or []:
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if field.name == "_metadata":
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continue
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fieldtype, aliases = _get_clean_type_and_aliases(field.type)
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yield Field(
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name=field.name,
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type=fieldtype,
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aliases=[a for a in aliases if a.name not in _global_aliases],
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)
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_global_aliases.update(a.name for a in aliases)
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all_exports: Set[str] = set()
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generated_code: List[str] = []
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generated_code.append("# Copyright (c) Facebook, Inc. and its affiliates.")
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generated_code.append("#")
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generated_code.append(
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"# This source code is licensed under the MIT license found in the"
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)
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generated_code.append("# LICENSE file in the root directory of this source tree.")
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generated_code.append("")
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generated_code.append("# pyre-strict")
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generated_code.append("")
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generated_code.append("# This file was generated by libcst.codegen.gen_matcher_classes")
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generated_code.append("from abc import ABC")
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generated_code.append("from dataclasses import dataclass")
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generated_code.append("from typing import Callable, Sequence, Union")
|
|
generated_code.append("from typing_extensions import Literal")
|
|
generated_code.append("import libcst as cst")
|
|
generated_code.append("")
|
|
generated_code.append(
|
|
"from libcst.matchers._matcher_base import BaseMatcherNode, DoNotCareSentinel, DoNotCare, OneOf, AllOf, DoesNotMatch, MatchIfTrue, MatchRegex, MatchMetadata, MatchMetadataIfTrue, ZeroOrMore, AtLeastN, ZeroOrOne, AtMostN, SaveMatchedNode, extract, extractall, findall, matches, replace"
|
|
)
|
|
all_exports.update(
|
|
[
|
|
"BaseMatcherNode",
|
|
"DoNotCareSentinel",
|
|
"DoNotCare",
|
|
"OneOf",
|
|
"AllOf",
|
|
"DoesNotMatch",
|
|
"MatchIfTrue",
|
|
"MatchRegex",
|
|
"MatchMetadata",
|
|
"MatchMetadataIfTrue",
|
|
"ZeroOrMore",
|
|
"AtLeastN",
|
|
"ZeroOrOne",
|
|
"AtMostN",
|
|
"SaveMatchedNode",
|
|
"extract",
|
|
"extractall",
|
|
"findall",
|
|
"matches",
|
|
"replace",
|
|
]
|
|
)
|
|
generated_code.append(
|
|
"from libcst.matchers._decorators import call_if_inside, call_if_not_inside, visit, leave"
|
|
)
|
|
all_exports.update(["call_if_inside", "call_if_not_inside", "visit", "leave"])
|
|
generated_code.append(
|
|
"from libcst.matchers._visitors import MatchDecoratorMismatch, MatcherDecoratableTransformer, MatcherDecoratableVisitor"
|
|
)
|
|
all_exports.update(
|
|
[
|
|
"MatchDecoratorMismatch",
|
|
"MatcherDecoratableTransformer",
|
|
"MatcherDecoratableVisitor",
|
|
]
|
|
)
|
|
|
|
for base in typeclasses:
|
|
generated_code.append("")
|
|
generated_code.append("")
|
|
generated_code.append(f"class {base.__name__}(ABC):")
|
|
generated_code.append(" pass")
|
|
all_exports.add(base.__name__)
|
|
|
|
|
|
# Add a generic MetadataMatchType to be referred to by everywhere else.
|
|
generated_code.append("")
|
|
generated_code.append("")
|
|
generated_code.append("MetadataMatchType = Union[MatchMetadata, MatchMetadataIfTrue]")
|
|
|
|
|
|
for node in all_libcst_nodes:
|
|
if node.__name__.startswith("Base"):
|
|
continue
|
|
classes: List[str] = []
|
|
for tc in typeclasses:
|
|
if issubclass(node, tc):
|
|
classes.append(tc.__name__)
|
|
classes.append("BaseMatcherNode")
|
|
|
|
has_aliases = False
|
|
node_fields = list(_get_fields(node))
|
|
for field in node_fields:
|
|
for alias in field.aliases:
|
|
# Output a separator if we're going to output any aliases
|
|
if not has_aliases:
|
|
generated_code.append("")
|
|
generated_code.append("")
|
|
has_aliases = True
|
|
|
|
# Must generate code for aliases before the class they are referenced in
|
|
generated_code.append(f"{alias.name} = {alias.type}")
|
|
|
|
generated_code.append("")
|
|
generated_code.append("")
|
|
generated_code.append("@dataclass(frozen=True, eq=False, unsafe_hash=False)")
|
|
generated_code.append(f'class {node.__name__}({", ".join(classes)}):')
|
|
all_exports.add(node.__name__)
|
|
|
|
fields_printed = False
|
|
for field in node_fields:
|
|
fields_printed = True
|
|
generated_code.append(f" {field.name}: {field.type} = DoNotCare()")
|
|
|
|
# Add special metadata field
|
|
generated_code.append(
|
|
f" metadata: Union[MetadataMatchType, DoNotCareSentinel, OneOf[MetadataMatchType], AllOf[MetadataMatchType]] = DoNotCare()"
|
|
)
|
|
|
|
|
|
# TODO: Remove this once we completely remove ExtSlice.
|
|
# Allow old ExtSlice notation so that we don't break existing code
|
|
generated_code.append("")
|
|
generated_code.append("")
|
|
generated_code.append("ExtSlice = SubscriptElement")
|
|
all_exports.add("ExtSlice")
|
|
|
|
|
|
# Make sure to add an __all__ for flake8 and compatibility with "from libcst.matchers import *"
|
|
generated_code.append(f"__all__ = {repr(sorted(list(all_exports)))}")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
# Output the code
|
|
print("\n".join(generated_code))
|