Join.py

"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""

from __future__ import annotations

from typing import Any

from cfnlint.jsonschema import ValidationResult
from cfnlint.jsonschema.protocols import Validator
from cfnlint.rules.functions._BaseFn import BaseFn


class Join(BaseFn):
    """Check if Join values are correct"""

    id = "E1022"
    shortdesc = "Join validation of parameters"
    description = "Making sure the join function is properly configured"
    source_url = "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-join.html"
    tags = ["functions", "join"]

    def __init__(self) -> None:
        super().__init__(
            "Fn::Join",
            ("string",),
            resolved_rule="W1032",
        )
        self.child_rules.update(
            {
                "I1022": None,
            }
        )

    def fn_join(
        self, validator: Validator, s: Any, instance: Any, schema: Any
    ) -> ValidationResult:
        validator = validator.evolve(
            context=validator.context.evolve(strict_types=True)
        )
        errs = list(super().validate(validator, s, instance, schema))
        if errs:
            yield from iter(errs)

        for rule in self.child_rules.values():
            if rule is None or not hasattr(rule, "validate"):
                continue

            yield from rule.validate(validator, s, instance, schema)