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from dataclasses import dataclass
from mypy.nodes import AssignmentStmt, NameExpr
from refurb.checks.common import unmangle_name
from refurb.error import Error
@dataclass
class ErrorInfo(Error):
"""
Sometimes when you are debugging (or copy-pasting code) you will end up
with a variable that is assigning itself to itself. These lines can be
removed.
Bad:
```
name = input("What is your name? ")
name = name
```
Good:
```
name = input("What is your name? ")
```
"""
code = 160
name = "no-redundant-assignment"
categories = ("readability",)
msg: str = "Remove redundant assignment of variable to itself"
def check(node: AssignmentStmt, errors: list[Error]) -> None:
match node:
case AssignmentStmt(
lvalues=[NameExpr(fullname=lhs_name)],
rvalue=NameExpr(fullname=rhs_name),
) if lhs_name and unmangle_name(lhs_name) == unmangle_name(rhs_name):
errors.append(ErrorInfo.from_node(node))
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