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import codecs

import yaml

from .filebased import FileBasedSource


__all__ = ("YamlFileSource",)


class YamlFileSource(FileBasedSource):
    def __init__(self, *args, **kwargs):
        self.encoding = kwargs.pop("encoding", "utf-8")
        super(YamlFileSource, self).__init__(*args, **kwargs)

    def get_settings_from_file(self, file_path, settings, manager=None):
        content = codecs.open(file_path, "r", self.encoding).read().strip()
        if not content:
            return None

        content = yaml.safe_load(content)
        if not content:
            return None

        if not isinstance(content, dict):
            raise TypeError("YAML files must contain only mappings")

        for setting in settings:
            if setting.name in content:
                setting.value = content[setting.name]

        return settings