Function _as_pdf_document

src/__init__.py:504–525

Returns `document` downcast to a mupdf.PdfDocument. If downcast fails (i.e. `document` is not actually a `PdfDocument`) then we assert-fail if `required` is true (the default) else return a `mupdf.PdfDocument` with `.m_internal` false.

(document, required=True)

        assert 0, f'Unrecognised {type(document)=}'

def _as_pdf_document(document, required=True):
    '''
    Returns `document` downcast to a mupdf.PdfDocument. If downcast fails (i.e.
    `document` is not actually a `PdfDocument`) then we assert-fail if `required`
    is true (the default) else return a `mupdf.PdfDocument` with `.m_internal`
    false.
    '''
    if isinstance(document, Document):
        if document.is_closed:
            raise ValueError('document closed')
        document = document.this
    if isinstance(document, mupdf.PdfDocument):
        return document
    elif isinstance(document, mupdf.FzDocument):
        ret = mupdf.PdfDocument(document)
        if required:
            assert ret.m_internal
        return ret
    elif document is None:
        assert 0, f'document is None'
    else:
        assert 0, f'Unrecognised {type(document)=}'

def _as_fz_page(page):
    '''