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"""Check for if / assign blocks that can be rewritten with if-expressions."""
from astroid import nodes
from pylint.checkers import BaseChecker
from pylint.interfaces import IAstroidChecker
class ConsiderTernaryExpressionChecker(BaseChecker):
__implements__ = (IAstroidChecker,)
name = "consider_ternary_expression"
msgs = {
"W0160": (
"Consider rewriting as a ternary expression",
"consider-ternary-expression",
"Multiple assign statements spread across if/else blocks can be "
"rewritten with a single assignment and ternary expression",
)
}
def visit_if(self, node: nodes.If) -> None:
if isinstance(node.parent, nodes.If):
return
if len(node.body) != 1 or len(node.orelse) != 1:
return
bst = node.body[0]
ost = node.orelse[0]
if not isinstance(bst, nodes.Assign) or not isinstance(ost, nodes.Assign):
return
for (bname, oname) in zip(bst.targets, ost.targets):
if not isinstance(bname, nodes.AssignName) or not isinstance(
oname, nodes.AssignName
):
return
if bname.name != oname.name:
return
self.add_message("consider-ternary-expression", node=node)
def register(linter):
"""Required method to auto register this checker.
:param linter: Main interface object for Pylint plugins
:type linter: Pylint object
"""
linter.register_checker(ConsiderTernaryExpressionChecker(linter))
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