Source

pypy / pypy / objspace / std / ropeunicodeobject.py

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from pypy.objspace.std.model import registerimplementation, W_Object
from pypy.objspace.std.register_all import register_all
from pypy.objspace.std.multimethod import FailedToImplement
from pypy.interpreter.error import OperationError, operationerrfmt
from pypy.interpreter import gateway
from pypy.objspace.std.stringobject import W_StringObject
from pypy.objspace.std.ropeobject import W_RopeObject
from pypy.objspace.std.noneobject import W_NoneObject
from pypy.rlib import rope
from pypy.rlib.rstring import StringBuilder
from pypy.objspace.std.sliceobject import W_SliceObject, normalize_simple_slice
from pypy.objspace.std import unicodeobject, slicetype, iterobject
from pypy.objspace.std.tupleobject import W_TupleObject
from pypy.rlib.rarithmetic import intmask, ovfcheck
from pypy.module.unicodedata import unicodedb

from pypy.objspace.std.formatting import mod_format

from pypy.objspace.std.unicodeobject import (
    format__Unicode_ANY as format__RopeUnicode_ANY)


def wrapunicode(space, uni):
    return W_RopeUnicodeObject(rope.rope_from_unicode(uni))

def unicode_from_string(space, w_str):
    from pypy.objspace.std.unicodetype import getdefaultencoding
    assert isinstance(w_str, W_RopeObject)
    encoding = getdefaultencoding(space)
    w_retval = decode_string(space, w_str, encoding, "strict")
    if not space.isinstance_w(w_retval, space.w_unicode):
        raise operationerrfmt(
            space.w_TypeError,
            "decoder did not return an unicode object (type '%s')",
            space.type(w_retval).getname(space))
    assert isinstance(w_retval, W_RopeUnicodeObject)
    return w_retval

def decode_string(space, w_str, encoding, errors):
    from pypy.objspace.std.unicodetype import decode_object
    if errors is None or errors == "strict":
        node = w_str._node
        if encoding == 'ascii':
            result = rope.str_decode_ascii(node)
            if result is not None:
                return W_RopeUnicodeObject(result)
        elif encoding == 'latin-1':
            assert node.is_bytestring()
            return W_RopeUnicodeObject(node)
        elif encoding == "utf-8":
            result = rope.str_decode_utf8(node)
            if result is not None:
                return W_RopeUnicodeObject(result)
    w_result = decode_object(space, w_str, encoding, errors)
    return w_result

def encode_unicode(space, w_unistr, encoding, errors):
    from pypy.objspace.std.unicodetype import getdefaultencoding, \
        _get_encoding_and_errors, encode_object
    from pypy.objspace.std.ropeobject import W_RopeObject
    if errors is None or errors == "strict":
        node = w_unistr._node
        if encoding == 'ascii':
            result = rope.unicode_encode_ascii(node)
            if result is not None:
                return W_RopeObject(result)
        elif encoding == 'latin-1':
            result = rope.unicode_encode_latin1(node)
            if result is not None:
                return W_RopeObject(result)
        elif encoding == "utf-8":
            result = rope.unicode_encode_utf8(node)
            if result is not None:
                return W_RopeObject(result)
    return encode_object(space, w_unistr, encoding, errors)


# XXX create shared base class with RopeBuilder
class RopeUnicodeBuilder(object):
    """Mimic sufficent StringBuilder API for over simple character arrays"""

    def __init__(self, size=0):
        self.data = [u' '] * size
        self.pos = 0

    def append(self, ch):
        self.data[self.pos] = ch
        self.pos += 1

    def build(self):
        return rope.rope_from_unicharlist(self.data)


class W_RopeUnicodeObject(unicodeobject.W_AbstractUnicodeObject):
    from pypy.objspace.std.unicodetype import unicode_typedef as typedef
    _immutable_fields_ = ['_node']

    def __init__(w_self, node):
        w_self._node = node

    def builder(w_self, space, size=0):
        return RopeUnicodeBuilder(size)

    def construct(w_self, space, data):
        return W_RopeUnicodeObject(data)

    def iterator(w_self, space):
        return rope.ItemIterator(w_self._node)

    def length(w_self, space):
        return w_self._node.length()

    def raw_value(w_self):
        return w_self._node

    def str_w(w_self, space):
        return space.str_w(space.str(w_self))

    def unicode_w(self, space):
        return self._node.flatten_unicode()

    def create_if_subclassed(w_self):
        if type(w_self) is W_RopeUnicodeObject:
            return w_self
        return W_RopeUnicodeObject(w_self._node)

W_RopeUnicodeObject.EMPTY = W_RopeUnicodeObject(rope.LiteralStringNode.EMPTY)

registerimplementation(W_RopeUnicodeObject)

def ropeunicode_w(space, w_str):
    if isinstance(w_str, W_RopeUnicodeObject):
        return w_str._node
    if isinstance(w_str, W_RopeObject):
        return unicode_from_string(space, w_str)._node
    return rope.LiteralUnicodeNode(space.unicode_w(w_str))


class W_RopeUnicodeIterObject(iterobject.W_AbstractIterObject):
    from pypy.objspace.std.itertype import iter_typedef as typedef

    def __init__(w_self, w_rope, index=0):
        w_self.node = node = w_rope._node
        w_self.item_iter = rope.ItemIterator(node)
        w_self.index = index

def iter__RopeUnicode(space, w_uni):
    return W_RopeUnicodeIterObject(w_uni)

# Helper for converting int/long
def unicode_to_decimal_w(space, w_unistr):
    if not isinstance(w_unistr, W_RopeUnicodeObject):
        raise OperationError(space.w_TypeError,
                             space.wrap("expected unicode"))
    unistr = w_unistr._node
    length = unistr.length()
    result = ['\0'] * length
    digits = [ '0', '1', '2', '3', '4',
               '5', '6', '7', '8', '9']
    iter = rope.ItemIterator(unistr)
    for i in range(length):
        uchr = iter.nextint()
        if unicodedb.isspace(uchr):
            result[i] = ' '
            continue
        try:
            result[i] = digits[unicodedb.decimal(uchr)]
        except KeyError:
            if 0 < uchr < 256:
                result[i] = chr(uchr)
            else:
                w_encoding = space.wrap('decimal')
                w_start = space.wrap(i)
                w_end = space.wrap(i+1)
                w_reason = space.wrap('invalid decimal Unicode string')
                raise OperationError(space.w_UnicodeEncodeError, space.newtuple([w_encoding, w_unistr, w_start, w_end, w_reason]))
    return ''.join(result)

# string-to-unicode delegation
def delegate_Rope2RopeUnicode(space, w_rope):
    w_uni = unicode_from_string(space, w_rope)
    assert isinstance(w_uni, W_RopeUnicodeObject) # help the annotator!
    return w_uni

def str__RopeUnicode(space, w_uni):
    return space.call_method(w_uni, 'encode')

def lt__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    n1 = w_str1._node
    n2 = w_str2._node
    return space.newbool(rope.compare(n1, n2) < 0)

def le__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    n1 = w_str1._node
    n2 = w_str2._node
    return space.newbool(rope.compare(n1, n2) <= 0)

def _eq(w_str1, w_str2):
    result = rope.eq(w_str1._node, w_str2._node)
    return result

def eq__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    return space.newbool(_eq(w_str1, w_str2))

def eq__RopeUnicode_Rope(space, w_runi, w_rope):
    from pypy.objspace.std.unicodeobject import _unicode_string_comparison
    return _unicode_string_comparison(space, w_runi, w_rope,
                    False,  unicode_from_string)

def ne__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    return space.newbool(not _eq(w_str1, w_str2))

def ne__RopeUnicode_Rope(space, w_runi, w_rope):
    from pypy.objspace.std.unicodeobject import _unicode_string_comparison
    return _unicode_string_comparison(space, w_runi, w_rope,
                    True, unicode_from_string)

def gt__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    n1 = w_str1._node
    n2 = w_str2._node
    return space.newbool(rope.compare(n1, n2) > 0)

def ge__RopeUnicode_RopeUnicode(space, w_str1, w_str2):
    n1 = w_str1._node
    n2 = w_str2._node
    return space.newbool(rope.compare(n1, n2) >= 0)


def ord__RopeUnicode(space, w_uni):
    if w_uni._node.length() != 1:
        raise OperationError(space.w_TypeError, space.wrap('ord() expected a character'))
    return space.wrap(w_uni._node.getint(0))

def getnewargs__RopeUnicode(space, w_uni):
    return space.newtuple([W_RopeUnicodeObject(w_uni._node)])

def add__RopeUnicode_RopeUnicode(space, w_left, w_right):
    right = w_right._node
    left = w_left._node
    try:
        return W_RopeUnicodeObject(rope.concatenate(left, right))
    except OverflowError:
        raise OperationError(space.w_OverflowError,
                             space.wrap("string too long"))

def add__Rope_RopeUnicode(space, w_left, w_right):
    return space.add(unicode_from_string(space, w_left) , w_right)

def add__RopeUnicode_Rope(space, w_left, w_right):
    return space.add(w_left, unicode_from_string(space, w_right))

def contains__RopeUnicode_RopeUnicode(space, w_container, w_item):
    item = w_item._node
    container = w_container._node
    return space.newbool(rope.find(container, item) != -1)

def contains__Rope_RopeUnicode(space, w_container, w_item):
    return space.contains(unicode_from_string(space, w_container), w_item )

def unicode_join__RopeUnicode_ANY(space, w_self, w_list):
    l_w = space.listview(w_list)
    delim = w_self._node
    totlen = 0
    if len(l_w) == 0:
        return W_RopeUnicodeObject.EMPTY
    if (len(l_w) == 1 and
        space.is_w(space.type(l_w[0]), space.w_unicode)):
        return l_w[0]

    values_list = []
    for i in range(len(l_w)):
        w_item = l_w[i]
        if isinstance(w_item, W_RopeUnicodeObject):
            # shortcut for performane
            item = w_item._node
        elif space.isinstance_w(w_item, space.w_str):
            item = unicode_from_string(space, w_item)._node
        else:
            msg = 'sequence item %d: expected string or Unicode'
            raise operationerrfmt(space.w_TypeError, msg, i)
        values_list.append(item)
    try:
        return W_RopeUnicodeObject(rope.join(w_self._node, values_list))
    except OverflowError:
        raise OperationError(space.w_OverflowError,
                             space.wrap("string too long"))

def hash__RopeUnicode(space, w_uni):
    return space.wrap(rope.hash_rope(w_uni._node))

def len__RopeUnicode(space, w_uni):
    return space.wrap(w_uni._node.length())

def getitem__RopeUnicode_ANY(space, w_uni, w_index):
    ival = space.getindex_w(w_index, space.w_IndexError, "string index")
    uni = w_uni._node
    ulen = uni.length()
    if ival < 0:
        ival += ulen
    if ival < 0 or ival >= ulen:
        exc = space.call_function(space.w_IndexError,
                                  space.wrap("unicode index out of range"))
        raise OperationError(space.w_IndexError, exc)
    return W_RopeUnicodeObject(uni.getrope(ival))

def getitem__RopeUnicode_Slice(space, w_uni, w_slice):
    node = w_uni._node
    length = node.length()
    start, stop, step, sl = w_slice.indices4(space, length)
    if sl == 0:
        return W_RopeUnicodeObject.EMPTY
    return W_RopeUnicodeObject(rope.getslice(node, start, stop, step, sl))

def getslice__RopeUnicode_ANY_ANY(space, w_uni, w_start, w_stop):
    node = w_uni._node
    length = node.length()
    start, stop = normalize_simple_slice(space, length, w_start, w_stop)
    sl = stop - start
    if sl == 0:
        return W_RopeUnicodeObject.EMPTY
    return W_RopeUnicodeObject(rope.getslice(node, start, stop, 1, sl))

def mul__RopeUnicode_ANY(space, w_uni, w_times):
    try:
        times = space.getindex_w(w_times, space.w_OverflowError)
    except OperationError, e:
        if e.match(space, space.w_TypeError):
            raise FailedToImplement
        raise
    node = w_uni._node
    try:
        return W_RopeUnicodeObject(rope.multiply(node, times))
    except OverflowError:
        raise OperationError(space.w_OverflowError,
                             space.wrap("string too long"))

def mul__ANY_RopeUnicode(space, w_times, w_uni):
    return mul__RopeUnicode_ANY(space, w_uni, w_times)

def unicode_isspace__RopeUnicode(space, w_self):
    return w_self.isspace(space)

def unicode_isalpha__RopeUnicode(space, w_self):
    return w_self.isalpha(space)

def unicode_isalnum__RopeUnicode(space, w_self):
    return w_self.isalnum(space)

def unicode_isdecimal__RopeUnicode(space, w_self):
    return w_self.isdecimal(space)

def unicode_isdigit__RopeUnicode(space, w_self):
    return w_self.isdigit(space)

def unicode_isnumeric__RopeUnicode(space, w_self):
    return w_self.isnumeric(space)

def unicode_islower__RopeUnicode(space, w_self):
    return w_self.islower(space)

def unicode_isupper__RopeUnicode(space, w_self):
    return w_self.isupper(space)

def unicode_istitle__RopeUnicode(space, w_self):
    return w_self.istitle(space)

def _contains(i, uni):
    return unichr(i) in uni

def unicode_strip__RopeUnicode_None(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, True, True, unicodedb.isspace))
def unicode_strip__RopeUnicode_RopeUnicode(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, True, True, _contains,
                               w_chars._node.flatten_unicode()))

def unicode_strip__RopeUnicode_Rope(space, w_self, w_chars):
    return space.call_method(w_self, 'strip',
                             unicode_from_string(space, w_chars))

def unicode_lstrip__RopeUnicode_None(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, True, False, unicodedb.isspace))
def unicode_lstrip__RopeUnicode_RopeUnicode(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, True, False, _contains,
                               w_chars._node.flatten_unicode()))
def unicode_lstrip__RopeUnicode_Rope(space, w_self, w_chars):
    return space.call_method(w_self, 'lstrip',
                             unicode_from_string(space, w_chars))

def unicode_rstrip__RopeUnicode_None(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, False, True, unicodedb.isspace))
def unicode_rstrip__RopeUnicode_RopeUnicode(space, w_self, w_chars):
    return W_RopeUnicodeObject(rope.strip(w_self._node, False, True, _contains,
                               w_chars._node.flatten_unicode()))
def unicode_rstrip__RopeUnicode_Rope(space, w_self, w_chars):
    return space.call_method(w_self, 'rstrip',
                             unicode_from_string(space, w_chars))

def unicode_capitalize__RopeUnicode(space, w_self):
    input = w_self._node
    length = input.length()
    if length == 0:
        return w_self
    result = [u'\0'] * length
    iter = rope.ItemIterator(input)
    result[0] = unichr(unicodedb.toupper(iter.nextint()))
    for i in range(1, length):
        result[i] = unichr(unicodedb.tolower(iter.nextint()))
    return W_RopeUnicodeObject(rope.rope_from_unicharlist(result))

def unicode_title__RopeUnicode(space, w_self):
    input = w_self._node
    length = input.length()
    if length == 0:
        return w_self
    result = [u'\0'] * length
    iter = rope.ItemIterator(input)

    previous_is_cased = False
    for i in range(input.length()):
        unichar = iter.nextint()
        if previous_is_cased:
            result[i] = unichr(unicodedb.tolower(unichar))
        else:
            result[i] = unichr(unicodedb.totitle(unichar))
        previous_is_cased = unicodedb.iscased(unichar)
    return W_RopeUnicodeObject(rope.rope_from_unicharlist(result))

def unicode_lower__RopeUnicode(space, w_self):
    return w_self.lower(space)

def unicode_upper__RopeUnicode(space, w_self):
    return w_self.upper(space)

def unicode_swapcase__RopeUnicode(space, w_self):
    return w_self.swapcase(space)

def _convert_idx_params(space, w_self, w_start, w_end):
    self = w_self._node
    length = w_self._node.length()
    if space.is_w(w_start, space.w_None):
        w_start = space.wrap(0)
    if space.is_w(w_end, space.w_None):
        w_end = space.len(w_self)
    start = slicetype.adapt_bound(space, length, w_start)
    end = slicetype.adapt_bound(space, length, w_end)

    assert start >= 0
    assert end >= 0

    return (self, start, end)

def unicode_endswith__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    return space.newbool(rope.endswith(self, w_substr._node, start, end))

def unicode_startswith__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    # XXX this stuff can be waaay better for ootypebased backends if
    #     we re-use more of our rpython machinery (ie implement startswith
    #     with additional parameters as rpython)

    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    return space.newbool(rope.startswith(self, w_substr._node, start, end))

def unicode_startswith__RopeUnicode_Tuple_ANY_ANY(space, w_unistr, w_prefixes,
                                              w_start, w_end):
    unistr, start, end = _convert_idx_params(space, w_unistr, w_start, w_end)
    for w_prefix in space.fixedview(w_prefixes):
        prefix = ropeunicode_w(space, w_prefix)
        if rope.startswith(unistr, prefix, start, end):
            return space.w_True
    return space.w_False

def unicode_endswith__RopeUnicode_Tuple_ANY_ANY(space, w_unistr, w_suffixes,
                                            w_start, w_end):
    unistr, start, end = _convert_idx_params(space, w_unistr, w_start, w_end)
    for w_suffix in space.fixedview(w_suffixes):
        suffix = ropeunicode_w(space, w_suffix)
        if rope.endswith(unistr, suffix, start, end):
            return space.w_True
    return space.w_False


def _to_unichar_w(space, w_char):
    try:
        unistr = ropeunicode_w(space, w_char)
    except OperationError, e:
        if e.match(space, space.w_TypeError):
            msg = 'The fill character cannot be converted to Unicode'
            raise OperationError(space.w_TypeError, space.wrap(msg))
        else:
            raise

    if unistr.length() != 1:
        raise OperationError(space.w_TypeError, space.wrap('The fill character must be exactly one character long'))
    return unistr

def unicode_center__RopeUnicode_ANY_ANY(space, w_self, w_width, w_fillchar):
    self = w_self._node
    length = self.length()
    width = space.int_w(w_width)
    fillchar = _to_unichar_w(space, w_fillchar)
    padding = width - length
    if padding < 0:
        return w_self.create_if_subclassed()
    offset = padding // 2
    pre = rope.multiply(fillchar, offset)
    post = rope.multiply(fillchar, (padding - offset))
    centered = rope.rebalance([pre, self, post])
    return W_RopeUnicodeObject(centered)

def unicode_ljust__RopeUnicode_ANY_ANY(space, w_self, w_width, w_fillchar):
    self = w_self._node
    length = self.length()
    width = space.int_w(w_width)
    fillchar = _to_unichar_w(space, w_fillchar)
    padding = width - length
    if padding < 0:
        return w_self.create_if_subclassed()
    resultnode = rope.concatenate(self, rope.multiply(fillchar, padding))
    return W_RopeUnicodeObject(resultnode)

def unicode_rjust__RopeUnicode_ANY_ANY(space, w_self, w_width, w_fillchar):
    self = w_self._node
    length = self.length()
    width = space.int_w(w_width)
    fillchar = _to_unichar_w(space, w_fillchar)
    padding = width - length
    if padding < 0:
        return w_self.create_if_subclassed()
    resultnode = rope.concatenate(rope.multiply(fillchar, padding), self)
    return W_RopeUnicodeObject(resultnode)

def unicode_zfill__RopeUnicode_ANY(space, w_self, w_width):
    self = w_self._node
    length = self.length()
    width = space.int_w(w_width)
    zero = rope.LiteralStringNode.PREBUILT[ord("0")]
    if self.length() == 0:
        return W_RopeUnicodeObject(
            rope.multiply(zero, width))
    padding = width - length
    if padding <= 0:
        return w_self.create_if_subclassed()
    firstchar = self.getunichar(0)
    if firstchar in (u'+', u'-'):
        return W_RopeUnicodeObject(rope.rebalance(
            [rope.LiteralStringNode.PREBUILT[ord(firstchar)],
             rope.multiply(zero, padding),
             rope.getslice_one(self, 1, length)]))
    else:
        return W_RopeUnicodeObject(rope.concatenate(
            rope.multiply(zero, padding), self))

def unicode_splitlines__RopeUnicode_ANY(space, w_self, w_keepends):
    keepends = bool(space.int_w(w_keepends))  # truth value, but type checked
    node = w_self._node
    return space.newlist(
        [W_RopeUnicodeObject(n) for n in rope.splitlines(node, keepends)])

def unicode_find__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    sub = w_substr._node
    return space.wrap(rope.find(self, sub, start, end))

def unicode_rfind__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    self = self.flatten_unicode()
    sub = w_substr._node.flatten_unicode()
    res = self.rfind(sub, start, end)
    return space.wrap(res)

def unicode_index__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    sub = w_substr._node
    res = rope.find(self, sub, start, end)
    if res < 0:
        raise OperationError(space.w_ValueError,
                             space.wrap("substring not found in string.index"))
    return space.wrap(res)

def unicode_rindex__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    # XXX works but flattens string
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    self = self.flatten_unicode()
    sub = w_substr._node.flatten_unicode()
    res = self.rfind(sub, start, end)
    if res < 0:
        raise OperationError(space.w_ValueError,
                             space.wrap("substring not found in string.rindex"))

    return space.wrap(res)

def unicode_count__RopeUnicode_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
    self, start, end = _convert_idx_params(space, w_self, w_start, w_end)
    assert start >= 0
    assert end >= 0
    iter = rope.FindIterator(self, w_substr._node, start, end)
    i = 0
    while 1:
        try:
            index = iter.next()
        except StopIteration:
            break
        i += 1
    return space.wrap(i)

def unicode_split__RopeUnicode_None_ANY(space, w_self, w_none, w_maxsplit):
    selfnode = w_self._node
    maxsplit = space.int_w(w_maxsplit)
    res_w = [W_RopeUnicodeObject(node)
                for node in rope.split_chars(selfnode, maxsplit, unicodedb.isspace)]
    return space.newlist(res_w)

def unicode_split__RopeUnicode_RopeUnicode_ANY(space, w_self, w_delim, w_maxsplit):
    maxsplit = space.int_w(w_maxsplit)
    start = 0
    selfnode = w_self._node
    delimnode = w_delim._node
    delimlen = delimnode.length()
    if delimlen == 0:
        raise OperationError(space.w_ValueError, space.wrap("empty separator"))
    res_w = [W_RopeUnicodeObject(node)
                for node in rope.split(selfnode, delimnode, maxsplit)]
    return space.newlist(res_w)

def unicode_rsplit__RopeUnicode_None_ANY(space, w_self, w_none, w_maxsplit):
    selfnode = w_self._node
    maxsplit = space.int_w(w_maxsplit)
    res_w = [W_RopeUnicodeObject(node)
                for node in rope.rsplit_chars(selfnode, maxsplit, unicodedb.isspace)]
    return space.newlist(res_w)


def unicode_rsplit__RopeUnicode_RopeUnicode_ANY(space, w_self, w_delim, w_maxsplit):
    # XXX works but flattens
    self = w_self._node.flatten_unicode()
    delim = w_delim._node.flatten_unicode()
    maxsplit = space.int_w(w_maxsplit)
    delim_len = len(delim)
    if delim_len == 0:
        raise OperationError(space.w_ValueError,
                             space.wrap('empty separator'))
    parts = []
    if len(self) == 0:
        return space.newlist([])
    start = 0
    end = len(self)
    while maxsplit != 0:
        index = self.rfind(delim, 0, end)
        if index < 0:
            break
        parts.append(W_RopeUnicodeObject(
            rope.getslice_one(w_self._node, index+delim_len, end)))
        end = index
        maxsplit -= 1
    parts.append(W_RopeUnicodeObject(
        rope.getslice_one(w_self._node, 0, end)))
    parts.reverse()
    return space.newlist(parts)

def _split_into_chars(self, maxsplit):
    if maxsplit == 0:
        return [self]
    index = 0
    end = self.length()
    parts = [rope.LiteralStringNode.EMPTY]
    maxsplit -= 1
    while maxsplit != 0:
        if index >= end:
            break
        parts.append(self.getrope(index))
        index += 1
        maxsplit -= 1
    parts.append(rope.getslice_one(self, index, self.length()))
    return parts

def unicode_replace__RopeUnicode_RopeUnicode_RopeUnicode_ANY(
        space, w_self, w_old, w_new, w_maxsplit):
    self = w_self._node
    old = w_old._node
    maxsplit = space.int_w(w_maxsplit)
    oldlength = old.length()
    if not oldlength:
        parts = _split_into_chars(self, maxsplit)
        try:
            return W_RopeUnicodeObject(rope.join(w_new._node, parts))
        except OverflowError:
            raise OperationError(space.w_OverflowError,
                                 space.wrap("string too long"))
    substrings = rope.split(self, old, maxsplit)
    if not substrings:
        return w_self.create_if_subclassed()
    try:
        return W_RopeUnicodeObject(rope.join(w_new._node, substrings))
    except OverflowError:
        raise OperationError(space.w_OverflowError,
                             space.wrap("string too long"))


def unicode_encode__RopeUnicode_ANY_ANY(space, w_unistr,
                                        w_encoding=None,
                                        w_errors=None):

    from pypy.objspace.std.unicodetype import getdefaultencoding, \
        _get_encoding_and_errors
    encoding, errors = _get_encoding_and_errors(space, w_encoding, w_errors)
    if encoding is None:
        encoding = getdefaultencoding(space)
    return encode_unicode(space, w_unistr, encoding, errors)

def unicode_partition__RopeUnicode_RopeUnicode(space, w_unistr, w_unisub):
    self = w_unistr._node
    sub = w_unisub._node
    if not sub.length():
        raise OperationError(space.w_ValueError,
                             space.wrap("empty separator"))
    pos = rope.find(self, sub)
    if pos == -1:
        return space.newtuple([w_unistr, W_RopeUnicodeObject.EMPTY,
                               W_RopeUnicodeObject.EMPTY])
    else:
        return space.newtuple(
            [W_RopeUnicodeObject(rope.getslice_one(self, 0, pos)),
             w_unisub,
             W_RopeUnicodeObject(rope.getslice_one(self, pos + sub.length(),
                                            self.length()))])

def unicode_rpartition__RopeUnicode_RopeUnicode(space, w_unistr, w_unisub):
    # XXX works but flattens
    unistr = w_unistr._node.flatten_unicode()
    unisub = w_unisub._node.flatten_unicode()
    if not unisub:
        raise OperationError(space.w_ValueError,
                             space.wrap("empty separator"))
    pos = unistr.rfind(unisub)
    if pos == -1:
        return space.newtuple([W_RopeUnicodeObject.EMPTY,
                               W_RopeUnicodeObject.EMPTY, w_unistr])
    else:
        assert pos >= 0
        return space.newtuple([space.wrap(unistr[:pos]), w_unisub,
                               space.wrap(unistr[pos+len(unisub):])])


def unicode_expandtabs__RopeUnicode_ANY(space, w_self, w_tabsize):
    from pypy.objspace.std.ropeobject import _tabindent
    self = w_self._node
    tabsize  = space.int_w(w_tabsize)
    splitted = rope.split(self, rope.LiteralStringNode.PREBUILT[ord('\t')])
    last = splitted[0]
    expanded = [last]
    for i in range(1, len(splitted)):
        expanded.append(rope.multiply(rope.LiteralStringNode.PREBUILT[ord(" ")],
                                      _tabindent(last, tabsize)))
        last = splitted[i]
        expanded.append(last)
    try:
        return W_RopeUnicodeObject(rope.rebalance(expanded))
    except OverflowError:
        raise OperationError(space.w_OverflowError,
                             space.wrap("string too long"))

def unicode_translate__RopeUnicode_ANY(space, w_self, w_table):
    self = w_self._node
    w_sys = space.getbuiltinmodule('sys')
    maxunicode = space.int_w(space.getattr(w_sys, space.wrap("maxunicode")))
    result = []
    iter = rope.ItemIterator(self)
    for i in range(self.length()):
        crope = iter.nextrope()
        char = crope.getint(0)
        try:
            w_newval = space.getitem(w_table, space.wrap(char))
        except OperationError, e:
            if e.match(space, space.w_LookupError):
                result.append(crope)
            else:
                raise
        else:
            if space.is_w(w_newval, space.w_None):
                continue
            elif space.isinstance_w(w_newval, space.w_int):
                newval = space.int_w(w_newval)
                if newval < 0 or newval > maxunicode:
                    raise OperationError(
                            space.w_TypeError,
                            space.wrap("character mapping must be in range(0x%x)" % (maxunicode + 1,)))
                result.append(rope.rope_from_unichar(unichr(newval)))
            elif space.isinstance_w(w_newval, space.w_unicode):
                result.append(ropeunicode_w(space, w_newval))
            else:
                raise OperationError(
                    space.w_TypeError,
                    space.wrap("character mapping must return integer, None or unicode"))
    return W_RopeUnicodeObject(rope.join(rope.LiteralStringNode.EMPTY, result))

# Move this into the _codecs module as 'unicodeescape_string (Remember to cater for quotes)'
def repr__RopeUnicode(space, w_unicode):
    hexdigits = "0123456789abcdef"
    node = w_unicode._node
    size = node.length()

    singlequote = doublequote = False
    iter = rope.ItemIterator(node)
    for i in range(size):
        c = iter.nextunichar()
        if singlequote and doublequote:
            break
        if c == u'\'':
            singlequote = True
        elif c == u'"':
            doublequote = True
    if singlequote and not doublequote:
        quote = '"'
    else:
        quote = '\''
    result = ['u', quote]
    iter = rope.ItemIterator(node)
    j = 0
    while j < size:
        code = iter.nextint()
        if code >= 0x10000:
            result.extend(['\\', "U",
                           hexdigits[(code >> 28) & 0xf],
                           hexdigits[(code >> 24) & 0xf],
                           hexdigits[(code >> 20) & 0xf],
                           hexdigits[(code >> 16) & 0xf],
                           hexdigits[(code >> 12) & 0xf],
                           hexdigits[(code >>  8) & 0xf],
                           hexdigits[(code >>  4) & 0xf],
                           hexdigits[(code >>  0) & 0xf],
                           ])
            j += 1
            continue
        if code >= 0xD800 and code < 0xDC00:
            if j < size - 1:
                code2 = iter.nextint()
                # XXX this is wrong: if the next if is false,
                # code2 is lost
                if code2 >= 0xDC00 and code2 <= 0xDFFF:
                    code = (((code & 0x03FF) << 10) | (code2 & 0x03FF)) + 0x00010000
                    result.extend(['\\', "U",
                                   hexdigits[(code >> 28) & 0xf],
                                   hexdigits[(code >> 24) & 0xf],
                                   hexdigits[(code >> 20) & 0xf],
                                   hexdigits[(code >> 16) & 0xf],
                                   hexdigits[(code >> 12) & 0xf],
                                   hexdigits[(code >>  8) & 0xf],
                                   hexdigits[(code >>  4) & 0xf],
                                   hexdigits[(code >>  0) & 0xf],
                                  ])
                    j += 2
                    continue

        if code >= 0x100:
            result.extend(['\\', "u",
                           hexdigits[(code >> 12) & 0xf],
                           hexdigits[(code >>  8) & 0xf],
                           hexdigits[(code >>  4) & 0xf],
                           hexdigits[(code >>  0) & 0xf],
                          ])
            j += 1
            continue
        if code == ord('\\') or code == ord(quote):
            result.append('\\')
            result.append(chr(code))
            j += 1
            continue
        if code == ord('\t'):
            result.append('\\')
            result.append('t')
            j += 1
            continue
        if code == ord('\r'):
            result.append('\\')
            result.append('r')
            j += 1
            continue
        if code == ord('\n'):
            result.append('\\')
            result.append('n')
            j += 1
            continue
        if code < ord(' ') or code >= 0x7f:
            result.extend(['\\', "x",
                           hexdigits[(code >> 4) & 0xf],
                           hexdigits[(code >> 0) & 0xf],
                          ])
            j += 1
            continue
        result.append(chr(code))
        j += 1
    result.append(quote)
    return W_RopeObject(rope.rope_from_charlist(result))

def mod__RopeUnicode_ANY(space, w_format, w_values):
    return mod_format(space, w_format, w_values, do_unicode=True)

def buffer__RopeUnicode(space, w_unicode):
    from pypy.rlib.rstruct.unichar import pack_unichar, UNICODE_SIZE
    node = w_unicode._node
    iter = rope.ItemIterator(node)
    length = node.length()
    builder = StringBuilder(length * UNICODE_SIZE)
    for idx in range(length):
        unich = unichr(iter.nextint())
        pack_unichar(unich, builder)
    from pypy.interpreter.buffer import StringBuffer
    return space.wrap(StringBuffer(builder.build()))


# methods of the iterator

def iter__RopeUnicodeIter(space, w_ropeiter):
    return w_ropeiter

def next__RopeUnicodeIter(space, w_ropeiter):
    if w_ropeiter.node is None:
        raise OperationError(space.w_StopIteration, space.w_None)
    try:
        unichar = w_ropeiter.item_iter.nextunichar()
        w_item = space.wrap(unichar)
    except StopIteration:
        w_ropeiter.node = None
        w_ropeiter.char_iter = None
        raise OperationError(space.w_StopIteration, space.w_None)
    w_ropeiter.index += 1
    return w_item

# XXX __length_hint__()
##def len__RopeUnicodeIter(space,  w_ropeiter):
##    if w_ropeiter.node is None:
##        return space.wrap(0)
##    index = w_ropeiter.index
##    length = w_ropeiter.node.length()
##    result = length - index
##    if result < 0:
##        return space.wrap(0)
##    return space.wrap(result)

from pypy.objspace.std import unicodetype
register_all(vars(), unicodetype)

# str.strip(unicode) needs to convert self to unicode and call unicode.strip we
# use the following magic to register strip_string_unicode as a String
# multimethod.

# XXX couldn't string and unicode _share_ the multimethods that make up their
# methods?

class str_methods:
    from pypy.objspace.std import stringtype
    W_RopeUnicodeObject = W_RopeUnicodeObject
    from pypy.objspace.std.ropeobject import W_RopeObject
    def str_strip__Rope_RopeUnicode(space, w_self, w_chars):
        return space.call_method(unicode_from_string(space, w_self),
                                 'strip', w_chars)
    def str_lstrip__Rope_RopeUnicode(space, w_self, w_chars):
        return space.call_method(unicode_from_string(space, w_self),
                                 'lstrip', w_chars)
    def str_rstrip__Rope_RopeUnicode(space, w_self, w_chars):
        return space.call_method(unicode_from_string(space, w_self),
                                 'rstrip', w_chars)
    def str_count__Rope_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
        return space.call_method(unicode_from_string(space, w_self),
                                 'count', w_substr, w_start, w_end)
    def str_find__Rope_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
        return space.call_method(unicode_from_string(space, w_self),
                                 'find', w_substr, w_start, w_end)
    def str_rfind__Rope_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
        return space.call_method(unicode_from_string(space, w_self),
                                 'rfind', w_substr, w_start, w_end)
    def str_index__Rope_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
        return space.call_method(unicode_from_string(space, w_self),
                                 'index', w_substr, w_start, w_end)
    def str_rindex__Rope_RopeUnicode_ANY_ANY(space, w_self, w_substr, w_start, w_end):
        return space.call_method(unicode_from_string(space, w_self),
                                 'rindex', w_substr, w_start, w_end)
    def str_replace__Rope_RopeUnicode_RopeUnicode_ANY(space, w_self, w_old, w_new, w_maxsplit):
        return space.call_method(unicode_from_string(space, w_self),
                                 'replace', w_old, w_new, w_maxsplit)
    def str_split__Rope_RopeUnicode_ANY(space, w_self, w_delim, w_maxsplit):
        return space.call_method(unicode_from_string(space, w_self),
                                 'split', w_delim, w_maxsplit)
    def str_rsplit__Rope_RopeUnicode_ANY(space, w_self, w_delim, w_maxsplit):
        return space.call_method(unicode_from_string(space, w_self),
                                 'rsplit', w_delim, w_maxsplit)
    register_all(vars(), stringtype)