filters.py 文件源码

def do_wordwrap(environment, s, width=79, break_long_words=True,
                wrapstring=None):
    """
    Return a copy of the string passed to the filter wrapped after
    ``79`` characters.  You can override this default using the first
    parameter.  If you set the second parameter to `false` Jinja will not
    split words apart if they are longer than `width`. By default, the newlines
    will be the default newlines for the environment, but this can be changed
    using the wrapstring keyword argument.

    .. versionadded:: 2.7
       Added support for the `wrapstring` parameter.
    """
    if not wrapstring:
        wrapstring = environment.newline_sequence
    import textwrap
    return wrapstring.join(textwrap.wrap(s, width=width, expand_tabs=False,
                                   replace_whitespace=False,
                                   break_long_words=break_long_words))