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argument_record.py
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argument_record.py
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"""
Wrapper for an `ast.arg` node.
"""
from typing import List, Optional, Set
import handsdown.ast_parser.smart_ast as ast
from handsdown.ast_parser.node_records.expression_record import ExpressionRecord
from handsdown.ast_parser.node_records.node_record import NodeRecord
from handsdown.ast_parser.node_records.text_record import TextRecord
from handsdown.ast_parser.type_defs import Node, RenderExpr
class ArgumentRecord(NodeRecord):
"""
Wrapper for an `ast.arg` node.
Arguments:
node -- AST node.
name -- Argument name.
type_hint -- Argument type hint.
prefix -- Prefix for arguemnt name, used for starargs.
"""
def __init__(
self,
node: ast.arg,
name: str,
type_hint: Optional[ast.expr] = None,
prefix: str = "",
) -> None:
super().__init__(node)
self._default: Optional[ExpressionRecord] = None
self.type_hint: Optional[ExpressionRecord] = None
if type_hint:
self.type_hint = ExpressionRecord(type_hint)
self.prefix = prefix
self.name = name
@property
def default(self) -> Optional[ExpressionRecord]:
"""
Default value of the argument.
Returns:
Default exression or None.
"""
return self._default
@property
def required(self) -> bool:
"""
Whether the argument is required.
Returns:
True if required, False otherwise.
"""
return self._default is None
def set_default(self, node: Node) -> None:
"""
Set default expression from test or `ast.AST` node.
Arguments:
node -- Text or AST node.
"""
if isinstance(node, str):
self._default = TextRecord(self.node, node)
if isinstance(node, ast.AST):
self._default = ExpressionRecord(node)
@property
def related_names(self) -> Set[str]:
"""
Set of related names.
"""
result = set()
if self.default:
result.update(self.default.related_names)
if self.type_hint:
result.update(self.type_hint.related_names)
return result
def _render_parts(self) -> List[RenderExpr]:
parts: List[RenderExpr] = []
if self.prefix:
parts.append(self.prefix)
parts.append(self.name)
if self.type_hint:
parts.append(": ")
parts.append(self.type_hint)
if self.default:
parts.append(" = ")
parts.append(self.default)
elif self.default:
parts.append("=")
parts.append(self.default)
return parts
def _parse(self) -> None:
if self.default:
self.default.parse()
if self.type_hint:
self.type_hint.parse()