comparison mercurial/templateutil.py @ 40935:4591c9791a82

templatefuncs: specialize "no match" value of search() to allow % operation

If Python had Maybe or Option, the type of the search() result would be
Option<Mapping>, which can be considered as a 0/1 container of a Mapping.
So it makes sense that {search(r'no match pattern', x) % "whatever"} is
mapped to an empty string.

40934:d3e688b9ef2e

        # mark this as non-empty.
        return True

    def tovalue(self, context, mapping):
        return super(mappingdict, self).tovalue(context, mapping)[0]

class mappedgenerator(wrapped):
    """Wrapper for generator of strings which acts as a list

    The function ``make(context, *args)`` should return a generator of

40935:4591c9791a82

        # mark this as non-empty.
        return True

    def tovalue(self, context, mapping):
        return super(mappingdict, self).tovalue(context, mapping)[0]

class mappingnone(wrappedvalue):
    """Wrapper for None, but supports map operation

    This represents None of Optional[mappable]. It's similar to
    mapplinglist([]), but the underlying value is not [], but None.
    """

    def __init__(self):
        super(mappingnone, self).__init__(None)

    def itermaps(self, context):
        return iter([])

class mappedgenerator(wrapped):
    """Wrapper for generator of strings which acts as a list

    The function ``make(context, *args)`` should return a generator of