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# Source code for betty.sphinx.extension.replacements

    """
    Provide a Sphinx plugin to apply string replacements to source code.
    """

    from sphinx.application import Sphinx

    def render_replacements(app: Sphinx, docname: str, source: list[str]) -> None:
        """
        Handle Sphinx's source-read event to perform string replacements.
        """
        for token_name, value in app.env.config["html_context"][
            "betty_replacements"
        ].items():
            source[0] = source[0].replace("{{{ " + token_name + " }}}", value)

    def setup(app: Sphinx) -> None:
        """
        Implement Sphinx's extension setup.
        """
        app.connect("source-read", render_replacements)