<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def codemirror_parameters(field):
 """ Filter to include CodeMirror parameters as a JSON string for a single field. This must be called only on an allready rendered field, meaning you must not use this filter on a field before a form. Else, the field widget won't be correctly initialized. Example: :: {% load djangocodemirror_tags %} {{ form.myfield|codemirror_parameters }} Arguments: field (djangocodemirror.fields.CodeMirrorField):
 A form field. Returns: string: JSON object for parameters, marked safe for Django templates. """

    manifesto = CodemirrorAssetTagRender()
    names = manifesto.register_from_fields(field)

    config = manifesto.get_codemirror_parameters(names[0])

    return mark_safe(json.dumps(config))