644 lines
26 KiB
Python
644 lines
26 KiB
Python
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"""Base visitor that implements an identity AST transform.
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Subclass TransformVisitor to perform non-trivial transformations.
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"""
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from typing import List, Dict, cast, Optional, Iterable
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from mypy.nodes import (
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AssertTypeExpr, MypyFile, Import, Node, ImportAll, ImportFrom, FuncItem, FuncDef,
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OverloadedFuncDef, ClassDef, Decorator, Block, Var,
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OperatorAssignmentStmt, ExpressionStmt, AssignmentStmt, ReturnStmt,
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RaiseStmt, AssertStmt, DelStmt, BreakStmt, ContinueStmt,
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PassStmt, GlobalDecl, WhileStmt, ForStmt, IfStmt, TryStmt, WithStmt,
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CastExpr, RevealExpr, TupleExpr, GeneratorExpr, ListComprehension, ListExpr,
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ConditionalExpr, DictExpr, SetExpr, NameExpr, IntExpr, StrExpr, BytesExpr,
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UnicodeExpr, FloatExpr, CallExpr, SuperExpr, MemberExpr, IndexExpr,
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SliceExpr, OpExpr, UnaryExpr, LambdaExpr, TypeApplication, PrintStmt,
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SymbolTable, RefExpr, TypeVarExpr, ParamSpecExpr, NewTypeExpr, PromoteExpr,
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ComparisonExpr, TempNode, StarExpr, Statement, Expression,
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YieldFromExpr, NamedTupleExpr, TypedDictExpr, NonlocalDecl, SetComprehension,
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DictionaryComprehension, ComplexExpr, TypeAliasExpr, EllipsisExpr,
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YieldExpr, ExecStmt, Argument, BackquoteExpr, AwaitExpr, AssignmentExpr,
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OverloadPart, EnumCallExpr, REVEAL_TYPE, GDEF, TypeVarTupleExpr
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)
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from mypy.types import Type, FunctionLike, ProperType
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from mypy.traverser import TraverserVisitor
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from mypy.visitor import NodeVisitor
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from mypy.util import replace_object_state
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class TransformVisitor(NodeVisitor[Node]):
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"""Transform a semantically analyzed AST (or subtree) to an identical copy.
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Use the node() method to transform an AST node.
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Subclass to perform a non-identity transform.
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Notes:
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* This can only be used to transform functions or classes, not top-level
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statements, and/or modules as a whole.
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* Do not duplicate TypeInfo nodes. This would generally not be desirable.
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* Only update some name binding cross-references, but only those that
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refer to Var, Decorator or FuncDef nodes, not those targeting ClassDef or
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TypeInfo nodes.
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* Types are not transformed, but you can override type() to also perform
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type transformation.
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TODO nested classes and functions have not been tested well enough
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"""
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def __init__(self) -> None:
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# To simplify testing, set this flag to True if you want to transform
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# all statements in a file (this is prohibited in normal mode).
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self.test_only = False
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# There may be multiple references to a Var node. Keep track of
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# Var translations using a dictionary.
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self.var_map: Dict[Var, Var] = {}
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# These are uninitialized placeholder nodes used temporarily for nested
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# functions while we are transforming a top-level function. This maps an
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# untransformed node to a placeholder (which will later become the
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# transformed node).
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self.func_placeholder_map: Dict[FuncDef, FuncDef] = {}
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def visit_mypy_file(self, node: MypyFile) -> MypyFile:
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assert self.test_only, "This visitor should not be used for whole files."
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# NOTE: The 'names' and 'imports' instance variables will be empty!
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ignored_lines = {line: codes[:]
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for line, codes in node.ignored_lines.items()}
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new = MypyFile(self.statements(node.defs), [], node.is_bom,
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ignored_lines=ignored_lines)
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new._fullname = node._fullname
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new.path = node.path
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new.names = SymbolTable()
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return new
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def visit_import(self, node: Import) -> Import:
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return Import(node.ids[:])
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def visit_import_from(self, node: ImportFrom) -> ImportFrom:
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return ImportFrom(node.id, node.relative, node.names[:])
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def visit_import_all(self, node: ImportAll) -> ImportAll:
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return ImportAll(node.id, node.relative)
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def copy_argument(self, argument: Argument) -> Argument:
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arg = Argument(
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self.visit_var(argument.variable),
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argument.type_annotation,
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argument.initializer,
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argument.kind,
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)
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# Refresh lines of the inner things
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arg.set_line(argument.line)
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return arg
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def visit_func_def(self, node: FuncDef) -> FuncDef:
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# Note that a FuncDef must be transformed to a FuncDef.
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# These contortions are needed to handle the case of recursive
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# references inside the function being transformed.
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# Set up placeholder nodes for references within this function
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# to other functions defined inside it.
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# Don't create an entry for this function itself though,
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# since we want self-references to point to the original
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# function if this is the top-level node we are transforming.
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init = FuncMapInitializer(self)
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for stmt in node.body.body:
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stmt.accept(init)
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new = FuncDef(node.name,
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[self.copy_argument(arg) for arg in node.arguments],
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self.block(node.body),
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cast(Optional[FunctionLike], self.optional_type(node.type)))
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self.copy_function_attributes(new, node)
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new._fullname = node._fullname
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new.is_decorated = node.is_decorated
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new.is_conditional = node.is_conditional
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new.is_abstract = node.is_abstract
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new.is_static = node.is_static
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new.is_class = node.is_class
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new.is_property = node.is_property
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new.is_final = node.is_final
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new.original_def = node.original_def
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if node in self.func_placeholder_map:
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# There is a placeholder definition for this function. Replace
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# the attributes of the placeholder with those form the transformed
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# function. We know that the classes will be identical (otherwise
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# this wouldn't work).
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result = self.func_placeholder_map[node]
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replace_object_state(result, new)
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return result
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else:
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return new
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def visit_lambda_expr(self, node: LambdaExpr) -> LambdaExpr:
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new = LambdaExpr([self.copy_argument(arg) for arg in node.arguments],
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self.block(node.body),
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cast(Optional[FunctionLike], self.optional_type(node.type)))
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self.copy_function_attributes(new, node)
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return new
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def copy_function_attributes(self, new: FuncItem,
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original: FuncItem) -> None:
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new.info = original.info
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new.min_args = original.min_args
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new.max_pos = original.max_pos
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new.is_overload = original.is_overload
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new.is_generator = original.is_generator
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new.line = original.line
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def visit_overloaded_func_def(self, node: OverloadedFuncDef) -> OverloadedFuncDef:
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items = [cast(OverloadPart, item.accept(self)) for item in node.items]
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for newitem, olditem in zip(items, node.items):
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newitem.line = olditem.line
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new = OverloadedFuncDef(items)
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new._fullname = node._fullname
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new_type = self.optional_type(node.type)
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assert isinstance(new_type, ProperType)
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new.type = new_type
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new.info = node.info
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new.is_static = node.is_static
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new.is_class = node.is_class
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new.is_property = node.is_property
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new.is_final = node.is_final
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if node.impl:
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new.impl = cast(OverloadPart, node.impl.accept(self))
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return new
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def visit_class_def(self, node: ClassDef) -> ClassDef:
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new = ClassDef(node.name,
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self.block(node.defs),
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node.type_vars,
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self.expressions(node.base_type_exprs),
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self.optional_expr(node.metaclass))
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new.fullname = node.fullname
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new.info = node.info
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new.decorators = [self.expr(decorator)
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for decorator in node.decorators]
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return new
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def visit_global_decl(self, node: GlobalDecl) -> GlobalDecl:
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return GlobalDecl(node.names[:])
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def visit_nonlocal_decl(self, node: NonlocalDecl) -> NonlocalDecl:
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return NonlocalDecl(node.names[:])
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def visit_block(self, node: Block) -> Block:
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return Block(self.statements(node.body))
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def visit_decorator(self, node: Decorator) -> Decorator:
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# Note that a Decorator must be transformed to a Decorator.
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func = self.visit_func_def(node.func)
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func.line = node.func.line
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new = Decorator(func, self.expressions(node.decorators),
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self.visit_var(node.var))
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new.is_overload = node.is_overload
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return new
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def visit_var(self, node: Var) -> Var:
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# Note that a Var must be transformed to a Var.
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if node in self.var_map:
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return self.var_map[node]
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new = Var(node.name, self.optional_type(node.type))
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new.line = node.line
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new._fullname = node._fullname
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new.info = node.info
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new.is_self = node.is_self
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new.is_ready = node.is_ready
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new.is_initialized_in_class = node.is_initialized_in_class
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new.is_staticmethod = node.is_staticmethod
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new.is_classmethod = node.is_classmethod
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new.is_property = node.is_property
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new.is_final = node.is_final
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new.final_value = node.final_value
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new.final_unset_in_class = node.final_unset_in_class
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new.final_set_in_init = node.final_set_in_init
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new.set_line(node.line)
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self.var_map[node] = new
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return new
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def visit_expression_stmt(self, node: ExpressionStmt) -> ExpressionStmt:
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return ExpressionStmt(self.expr(node.expr))
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def visit_assignment_stmt(self, node: AssignmentStmt) -> AssignmentStmt:
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return self.duplicate_assignment(node)
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def duplicate_assignment(self, node: AssignmentStmt) -> AssignmentStmt:
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new = AssignmentStmt(self.expressions(node.lvalues),
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self.expr(node.rvalue),
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self.optional_type(node.unanalyzed_type))
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new.line = node.line
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new.is_final_def = node.is_final_def
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new.type = self.optional_type(node.type)
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return new
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def visit_operator_assignment_stmt(self,
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node: OperatorAssignmentStmt) -> OperatorAssignmentStmt:
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return OperatorAssignmentStmt(node.op,
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self.expr(node.lvalue),
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self.expr(node.rvalue))
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def visit_while_stmt(self, node: WhileStmt) -> WhileStmt:
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return WhileStmt(self.expr(node.expr),
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self.block(node.body),
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self.optional_block(node.else_body))
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def visit_for_stmt(self, node: ForStmt) -> ForStmt:
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new = ForStmt(self.expr(node.index),
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self.expr(node.expr),
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self.block(node.body),
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self.optional_block(node.else_body),
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self.optional_type(node.unanalyzed_index_type))
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new.is_async = node.is_async
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new.index_type = self.optional_type(node.index_type)
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return new
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def visit_return_stmt(self, node: ReturnStmt) -> ReturnStmt:
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return ReturnStmt(self.optional_expr(node.expr))
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def visit_assert_stmt(self, node: AssertStmt) -> AssertStmt:
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return AssertStmt(self.expr(node.expr), self.optional_expr(node.msg))
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def visit_del_stmt(self, node: DelStmt) -> DelStmt:
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return DelStmt(self.expr(node.expr))
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def visit_if_stmt(self, node: IfStmt) -> IfStmt:
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return IfStmt(self.expressions(node.expr),
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self.blocks(node.body),
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self.optional_block(node.else_body))
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def visit_break_stmt(self, node: BreakStmt) -> BreakStmt:
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return BreakStmt()
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def visit_continue_stmt(self, node: ContinueStmt) -> ContinueStmt:
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return ContinueStmt()
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def visit_pass_stmt(self, node: PassStmt) -> PassStmt:
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return PassStmt()
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def visit_raise_stmt(self, node: RaiseStmt) -> RaiseStmt:
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return RaiseStmt(self.optional_expr(node.expr),
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self.optional_expr(node.from_expr))
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def visit_try_stmt(self, node: TryStmt) -> TryStmt:
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return TryStmt(self.block(node.body),
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self.optional_names(node.vars),
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self.optional_expressions(node.types),
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self.blocks(node.handlers),
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self.optional_block(node.else_body),
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self.optional_block(node.finally_body))
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def visit_with_stmt(self, node: WithStmt) -> WithStmt:
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new = WithStmt(self.expressions(node.expr),
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self.optional_expressions(node.target),
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self.block(node.body),
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self.optional_type(node.unanalyzed_type))
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new.is_async = node.is_async
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new.analyzed_types = [self.type(typ) for typ in node.analyzed_types]
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return new
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def visit_print_stmt(self, node: PrintStmt) -> PrintStmt:
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return PrintStmt(self.expressions(node.args),
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node.newline,
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self.optional_expr(node.target))
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def visit_exec_stmt(self, node: ExecStmt) -> ExecStmt:
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return ExecStmt(self.expr(node.expr),
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self.optional_expr(node.globals),
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self.optional_expr(node.locals))
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def visit_star_expr(self, node: StarExpr) -> StarExpr:
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return StarExpr(node.expr)
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def visit_int_expr(self, node: IntExpr) -> IntExpr:
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return IntExpr(node.value)
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def visit_str_expr(self, node: StrExpr) -> StrExpr:
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return StrExpr(node.value, node.from_python_3)
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def visit_bytes_expr(self, node: BytesExpr) -> BytesExpr:
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return BytesExpr(node.value)
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def visit_unicode_expr(self, node: UnicodeExpr) -> UnicodeExpr:
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return UnicodeExpr(node.value)
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def visit_float_expr(self, node: FloatExpr) -> FloatExpr:
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return FloatExpr(node.value)
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def visit_complex_expr(self, node: ComplexExpr) -> ComplexExpr:
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return ComplexExpr(node.value)
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def visit_ellipsis(self, node: EllipsisExpr) -> EllipsisExpr:
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return EllipsisExpr()
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def visit_name_expr(self, node: NameExpr) -> NameExpr:
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return self.duplicate_name(node)
|
||
|
|
|
||
|
|
def duplicate_name(self, node: NameExpr) -> NameExpr:
|
||
|
|
# This method is used when the transform result must be a NameExpr.
|
||
|
|
# visit_name_expr() is used when there is no such restriction.
|
||
|
|
new = NameExpr(node.name)
|
||
|
|
self.copy_ref(new, node)
|
||
|
|
new.is_special_form = node.is_special_form
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_member_expr(self, node: MemberExpr) -> MemberExpr:
|
||
|
|
member = MemberExpr(self.expr(node.expr),
|
||
|
|
node.name)
|
||
|
|
if node.def_var:
|
||
|
|
# This refers to an attribute and we don't transform attributes by default,
|
||
|
|
# just normal variables.
|
||
|
|
member.def_var = node.def_var
|
||
|
|
self.copy_ref(member, node)
|
||
|
|
return member
|
||
|
|
|
||
|
|
def copy_ref(self, new: RefExpr, original: RefExpr) -> None:
|
||
|
|
new.kind = original.kind
|
||
|
|
new.fullname = original.fullname
|
||
|
|
target = original.node
|
||
|
|
if isinstance(target, Var):
|
||
|
|
# Do not transform references to global variables. See
|
||
|
|
# testGenericFunctionAliasExpand for an example where this is important.
|
||
|
|
if original.kind != GDEF:
|
||
|
|
target = self.visit_var(target)
|
||
|
|
elif isinstance(target, Decorator):
|
||
|
|
target = self.visit_var(target.var)
|
||
|
|
elif isinstance(target, FuncDef):
|
||
|
|
# Use a placeholder node for the function if it exists.
|
||
|
|
target = self.func_placeholder_map.get(target, target)
|
||
|
|
new.node = target
|
||
|
|
new.is_new_def = original.is_new_def
|
||
|
|
new.is_inferred_def = original.is_inferred_def
|
||
|
|
|
||
|
|
def visit_yield_from_expr(self, node: YieldFromExpr) -> YieldFromExpr:
|
||
|
|
return YieldFromExpr(self.expr(node.expr))
|
||
|
|
|
||
|
|
def visit_yield_expr(self, node: YieldExpr) -> YieldExpr:
|
||
|
|
return YieldExpr(self.optional_expr(node.expr))
|
||
|
|
|
||
|
|
def visit_await_expr(self, node: AwaitExpr) -> AwaitExpr:
|
||
|
|
return AwaitExpr(self.expr(node.expr))
|
||
|
|
|
||
|
|
def visit_call_expr(self, node: CallExpr) -> CallExpr:
|
||
|
|
return CallExpr(self.expr(node.callee),
|
||
|
|
self.expressions(node.args),
|
||
|
|
node.arg_kinds[:],
|
||
|
|
node.arg_names[:],
|
||
|
|
self.optional_expr(node.analyzed))
|
||
|
|
|
||
|
|
def visit_op_expr(self, node: OpExpr) -> OpExpr:
|
||
|
|
new = OpExpr(node.op, self.expr(node.left), self.expr(node.right))
|
||
|
|
new.method_type = self.optional_type(node.method_type)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_comparison_expr(self, node: ComparisonExpr) -> ComparisonExpr:
|
||
|
|
new = ComparisonExpr(node.operators, self.expressions(node.operands))
|
||
|
|
new.method_types = [self.optional_type(t) for t in node.method_types]
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_cast_expr(self, node: CastExpr) -> CastExpr:
|
||
|
|
return CastExpr(self.expr(node.expr),
|
||
|
|
self.type(node.type))
|
||
|
|
|
||
|
|
def visit_assert_type_expr(self, node: AssertTypeExpr) -> AssertTypeExpr:
|
||
|
|
return AssertTypeExpr(self.expr(node.expr), self.type(node.type))
|
||
|
|
|
||
|
|
def visit_reveal_expr(self, node: RevealExpr) -> RevealExpr:
|
||
|
|
if node.kind == REVEAL_TYPE:
|
||
|
|
assert node.expr is not None
|
||
|
|
return RevealExpr(kind=REVEAL_TYPE, expr=self.expr(node.expr))
|
||
|
|
else:
|
||
|
|
# Reveal locals expressions don't have any sub expressions
|
||
|
|
return node
|
||
|
|
|
||
|
|
def visit_super_expr(self, node: SuperExpr) -> SuperExpr:
|
||
|
|
call = self.expr(node.call)
|
||
|
|
assert isinstance(call, CallExpr)
|
||
|
|
new = SuperExpr(node.name, call)
|
||
|
|
new.info = node.info
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_assignment_expr(self, node: AssignmentExpr) -> AssignmentExpr:
|
||
|
|
return AssignmentExpr(node.target, node.value)
|
||
|
|
|
||
|
|
def visit_unary_expr(self, node: UnaryExpr) -> UnaryExpr:
|
||
|
|
new = UnaryExpr(node.op, self.expr(node.expr))
|
||
|
|
new.method_type = self.optional_type(node.method_type)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_list_expr(self, node: ListExpr) -> ListExpr:
|
||
|
|
return ListExpr(self.expressions(node.items))
|
||
|
|
|
||
|
|
def visit_dict_expr(self, node: DictExpr) -> DictExpr:
|
||
|
|
return DictExpr([(self.expr(key) if key else None, self.expr(value))
|
||
|
|
for key, value in node.items])
|
||
|
|
|
||
|
|
def visit_tuple_expr(self, node: TupleExpr) -> TupleExpr:
|
||
|
|
return TupleExpr(self.expressions(node.items))
|
||
|
|
|
||
|
|
def visit_set_expr(self, node: SetExpr) -> SetExpr:
|
||
|
|
return SetExpr(self.expressions(node.items))
|
||
|
|
|
||
|
|
def visit_index_expr(self, node: IndexExpr) -> IndexExpr:
|
||
|
|
new = IndexExpr(self.expr(node.base), self.expr(node.index))
|
||
|
|
if node.method_type:
|
||
|
|
new.method_type = self.type(node.method_type)
|
||
|
|
if node.analyzed:
|
||
|
|
if isinstance(node.analyzed, TypeApplication):
|
||
|
|
new.analyzed = self.visit_type_application(node.analyzed)
|
||
|
|
else:
|
||
|
|
new.analyzed = self.visit_type_alias_expr(node.analyzed)
|
||
|
|
new.analyzed.set_line(node.analyzed.line)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def visit_type_application(self, node: TypeApplication) -> TypeApplication:
|
||
|
|
return TypeApplication(self.expr(node.expr),
|
||
|
|
self.types(node.types))
|
||
|
|
|
||
|
|
def visit_list_comprehension(self, node: ListComprehension) -> ListComprehension:
|
||
|
|
generator = self.duplicate_generator(node.generator)
|
||
|
|
generator.set_line(node.generator.line, node.generator.column)
|
||
|
|
return ListComprehension(generator)
|
||
|
|
|
||
|
|
def visit_set_comprehension(self, node: SetComprehension) -> SetComprehension:
|
||
|
|
generator = self.duplicate_generator(node.generator)
|
||
|
|
generator.set_line(node.generator.line, node.generator.column)
|
||
|
|
return SetComprehension(generator)
|
||
|
|
|
||
|
|
def visit_dictionary_comprehension(self, node: DictionaryComprehension
|
||
|
|
) -> DictionaryComprehension:
|
||
|
|
return DictionaryComprehension(self.expr(node.key), self.expr(node.value),
|
||
|
|
[self.expr(index) for index in node.indices],
|
||
|
|
[self.expr(s) for s in node.sequences],
|
||
|
|
[[self.expr(cond) for cond in conditions]
|
||
|
|
for conditions in node.condlists],
|
||
|
|
node.is_async)
|
||
|
|
|
||
|
|
def visit_generator_expr(self, node: GeneratorExpr) -> GeneratorExpr:
|
||
|
|
return self.duplicate_generator(node)
|
||
|
|
|
||
|
|
def duplicate_generator(self, node: GeneratorExpr) -> GeneratorExpr:
|
||
|
|
return GeneratorExpr(self.expr(node.left_expr),
|
||
|
|
[self.expr(index) for index in node.indices],
|
||
|
|
[self.expr(s) for s in node.sequences],
|
||
|
|
[[self.expr(cond) for cond in conditions]
|
||
|
|
for conditions in node.condlists],
|
||
|
|
node.is_async)
|
||
|
|
|
||
|
|
def visit_slice_expr(self, node: SliceExpr) -> SliceExpr:
|
||
|
|
return SliceExpr(self.optional_expr(node.begin_index),
|
||
|
|
self.optional_expr(node.end_index),
|
||
|
|
self.optional_expr(node.stride))
|
||
|
|
|
||
|
|
def visit_conditional_expr(self, node: ConditionalExpr) -> ConditionalExpr:
|
||
|
|
return ConditionalExpr(self.expr(node.cond),
|
||
|
|
self.expr(node.if_expr),
|
||
|
|
self.expr(node.else_expr))
|
||
|
|
|
||
|
|
def visit_backquote_expr(self, node: BackquoteExpr) -> BackquoteExpr:
|
||
|
|
return BackquoteExpr(self.expr(node.expr))
|
||
|
|
|
||
|
|
def visit_type_var_expr(self, node: TypeVarExpr) -> TypeVarExpr:
|
||
|
|
return TypeVarExpr(node.name, node.fullname,
|
||
|
|
self.types(node.values),
|
||
|
|
self.type(node.upper_bound), variance=node.variance)
|
||
|
|
|
||
|
|
def visit_paramspec_expr(self, node: ParamSpecExpr) -> ParamSpecExpr:
|
||
|
|
return ParamSpecExpr(
|
||
|
|
node.name, node.fullname, self.type(node.upper_bound), variance=node.variance
|
||
|
|
)
|
||
|
|
|
||
|
|
def visit_type_var_tuple_expr(self, node: TypeVarTupleExpr) -> TypeVarTupleExpr:
|
||
|
|
return TypeVarTupleExpr(
|
||
|
|
node.name, node.fullname, self.type(node.upper_bound), variance=node.variance
|
||
|
|
)
|
||
|
|
|
||
|
|
def visit_type_alias_expr(self, node: TypeAliasExpr) -> TypeAliasExpr:
|
||
|
|
return TypeAliasExpr(node.node)
|
||
|
|
|
||
|
|
def visit_newtype_expr(self, node: NewTypeExpr) -> NewTypeExpr:
|
||
|
|
res = NewTypeExpr(node.name, node.old_type, line=node.line, column=node.column)
|
||
|
|
res.info = node.info
|
||
|
|
return res
|
||
|
|
|
||
|
|
def visit_namedtuple_expr(self, node: NamedTupleExpr) -> NamedTupleExpr:
|
||
|
|
return NamedTupleExpr(node.info)
|
||
|
|
|
||
|
|
def visit_enum_call_expr(self, node: EnumCallExpr) -> EnumCallExpr:
|
||
|
|
return EnumCallExpr(node.info, node.items, node.values)
|
||
|
|
|
||
|
|
def visit_typeddict_expr(self, node: TypedDictExpr) -> Node:
|
||
|
|
return TypedDictExpr(node.info)
|
||
|
|
|
||
|
|
def visit__promote_expr(self, node: PromoteExpr) -> PromoteExpr:
|
||
|
|
return PromoteExpr(node.type)
|
||
|
|
|
||
|
|
def visit_temp_node(self, node: TempNode) -> TempNode:
|
||
|
|
return TempNode(self.type(node.type))
|
||
|
|
|
||
|
|
def node(self, node: Node) -> Node:
|
||
|
|
new = node.accept(self)
|
||
|
|
new.set_line(node.line)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def mypyfile(self, node: MypyFile) -> MypyFile:
|
||
|
|
new = node.accept(self)
|
||
|
|
assert isinstance(new, MypyFile)
|
||
|
|
new.set_line(node.line)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def expr(self, expr: Expression) -> Expression:
|
||
|
|
new = expr.accept(self)
|
||
|
|
assert isinstance(new, Expression)
|
||
|
|
new.set_line(expr.line, expr.column)
|
||
|
|
return new
|
||
|
|
|
||
|
|
def stmt(self, stmt: Statement) -> Statement:
|
||
|
|
new = stmt.accept(self)
|
||
|
|
assert isinstance(new, Statement)
|
||
|
|
new.set_line(stmt.line, stmt.column)
|
||
|
|
return new
|
||
|
|
|
||
|
|
# Helpers
|
||
|
|
#
|
||
|
|
# All the node helpers also propagate line numbers.
|
||
|
|
|
||
|
|
def optional_expr(self, expr: Optional[Expression]) -> Optional[Expression]:
|
||
|
|
if expr:
|
||
|
|
return self.expr(expr)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def block(self, block: Block) -> Block:
|
||
|
|
new = self.visit_block(block)
|
||
|
|
new.line = block.line
|
||
|
|
return new
|
||
|
|
|
||
|
|
def optional_block(self, block: Optional[Block]) -> Optional[Block]:
|
||
|
|
if block:
|
||
|
|
return self.block(block)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def statements(self, statements: List[Statement]) -> List[Statement]:
|
||
|
|
return [self.stmt(stmt) for stmt in statements]
|
||
|
|
|
||
|
|
def expressions(self, expressions: List[Expression]) -> List[Expression]:
|
||
|
|
return [self.expr(expr) for expr in expressions]
|
||
|
|
|
||
|
|
def optional_expressions(self, expressions: Iterable[Optional[Expression]]
|
||
|
|
) -> List[Optional[Expression]]:
|
||
|
|
return [self.optional_expr(expr) for expr in expressions]
|
||
|
|
|
||
|
|
def blocks(self, blocks: List[Block]) -> List[Block]:
|
||
|
|
return [self.block(block) for block in blocks]
|
||
|
|
|
||
|
|
def names(self, names: List[NameExpr]) -> List[NameExpr]:
|
||
|
|
return [self.duplicate_name(name) for name in names]
|
||
|
|
|
||
|
|
def optional_names(self, names: Iterable[Optional[NameExpr]]) -> List[Optional[NameExpr]]:
|
||
|
|
result: List[Optional[NameExpr]] = []
|
||
|
|
for name in names:
|
||
|
|
if name:
|
||
|
|
result.append(self.duplicate_name(name))
|
||
|
|
else:
|
||
|
|
result.append(None)
|
||
|
|
return result
|
||
|
|
|
||
|
|
def type(self, type: Type) -> Type:
|
||
|
|
# Override this method to transform types.
|
||
|
|
return type
|
||
|
|
|
||
|
|
def optional_type(self, type: Optional[Type]) -> Optional[Type]:
|
||
|
|
if type:
|
||
|
|
return self.type(type)
|
||
|
|
else:
|
||
|
|
return None
|
||
|
|
|
||
|
|
def types(self, types: List[Type]) -> List[Type]:
|
||
|
|
return [self.type(type) for type in types]
|
||
|
|
|
||
|
|
|
||
|
|
class FuncMapInitializer(TraverserVisitor):
|
||
|
|
"""This traverser creates mappings from nested FuncDefs to placeholder FuncDefs.
|
||
|
|
|
||
|
|
The placeholders will later be replaced with transformed nodes.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, transformer: TransformVisitor) -> None:
|
||
|
|
self.transformer = transformer
|
||
|
|
|
||
|
|
def visit_func_def(self, node: FuncDef) -> None:
|
||
|
|
if node not in self.transformer.func_placeholder_map:
|
||
|
|
# Haven't seen this FuncDef before, so create a placeholder node.
|
||
|
|
self.transformer.func_placeholder_map[node] = FuncDef(
|
||
|
|
node.name, node.arguments, node.body, None)
|
||
|
|
super().visit_func_def(node)
|