# -*- coding: utf8 -*-
# ============LICENSE_START=======================================================
# org.onap.vvp/validation-scripts
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from yaml.constructor import ConstructorError


def raise_duplicates_keys(loader, node, deep=False):
    """Raise error when duplicate keys found in yaml file."""

    mapping = {}
    for key_node, value_node in node.value:
        key = loader.construct_object(key_node, deep=deep)
        value = loader.construct_object(value_node, deep=deep)
        if key in mapping:
            raise ConstructorError(
                "while constructing a mapping", node.start_mark,
                "found duplicate key (%s)" % key, key_node.start_mark)
        mapping[key] = value

    return loader.construct_mapping(node, deep)