base.py 文件源码

def render_template(self, name_or_statement, context=None, by_name=False):

        if by_name:
            if name_or_statement not in self._templates:
                raise ValueError("No such template of name: '{}'.".format(name_or_statement))
            statement = self._templates[name_or_statement]
        else:
            statement = name_or_statement

        try:
            from sqlalchemy.sql.base import Executable
            if isinstance(statement, Executable):
                statement = str(statement.compile(compile_kwargs={"literal_binds": True}))
        except ImportError:
            pass

        if context is None or context is False:
            context = {}

        template_context = {}
        template_context.update(self._template_context)  # default context
        template_context.update(context)  # context passed in
        intersection = set(self._template_context.keys()) & set(context.keys())
        if intersection:
            logger.warning(
                "The following default template context keys have been overridden "
                "by the local context: {}."
                .format(intersection)
            )

        # Substitute in any other named statements recursively
        while '{{{' in statement or '{{%' in statement:
            statement = Template(statement,
                                 block_start_string='{{%',
                                 block_end_string='%}}',
                                 variable_start_string='{{{',
                                 variable_end_string='}}}',
                                 comment_start_string='{{#',
                                 comment_end_string='#}}',
                                 undefined=StrictUndefined).render(getattr(self, '_templates', {}))

        return Template(statement, undefined=StrictUndefined).render(template_context)