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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
import cgi
import copy
import sys

try:
    from UserDict import DictMixin
except ImportError:
    from collections import MutableMapping as DictMixin

class MultiDict(DictMixin):

    """
    An ordered dictionary that can have multiple values for each key.
    Adds the methods getall, getone, mixed, and add to the normal
    dictionary interface.
    """

    def __init__(self, *args, **kw):
        if len(args) > 1:
            raise TypeError(
                "MultiDict can only be called with one positional argument")
        if args:
            if hasattr(args[0], 'iteritems'):
                items = list(args[0].iteritems())
            elif hasattr(args[0], 'items'):
                items = args[0].items()
            else:
                items = list(args[0])
            self._items = items
        else:
            self._items = []
        self._items.extend(kw.iteritems())

    def __getitem__(self, key):
        for k, v in self._items:
            if k == key:
                return v
        raise KeyError(repr(key))

    def __setitem__(self, key, value):
        try:
            del self[key]
        except KeyError:
            pass
        self._items.append((key, value))

    def add(self, key, value):
        """
        Add the key and value, not overwriting any previous value.
        """
        self._items.append((key, value))

    def getall(self, key):
        """
        Return a list of all values matching the key (may be an empty list)
        """
        result = []
        for k, v in self._items:
            if key == k:
                result.append(v)
        return result

    def getone(self, key):
        """
        Get one value matching the key, raising a KeyError if multiple
        values were found.
        """
        v = self.getall(key)
        if not v:
            raise KeyError('Key not found: %r' % key)
        if len(v) > 1:
            raise KeyError('Multiple values match %r: %r' % (key, v))
        return v[0]

    def mixed(self):
        """
        Returns a dictionary where the values are either single
        values, or a list of values when a key/value appears more than
        once in this dictionary.  This is similar to the kind of
        dictionary often used to represent the variables in a web
        request.
        """
        result = {}
        multi = {}
        for key, value in self._items:
            if key in result:
                # We do this to not clobber any lists that are
                # *actual* values in this dictionary:
                if key in multi:
                    result[key].append(value)
                else:
                    result[key] = [result[key], value]
                    multi[key] = None
            else:
                result[key] = value
        return result

    def dict_of_lists(self):
        """
        Returns a dictionary where each key is associated with a
        list of values.
        """
        result = {}
        for key, value in self._items:
            if key in result:
                result[key].append(value)
            else:
                result[key] = [value]
        return result

    def __delitem__(self, key):
        items = self._items
        found = False
        for i in range(len(items)-1, -1, -1):
            if items[i][0] == key:
                del items[i]
                found = True
        if not found:
            raise KeyError(repr(key))

    def __contains__(self, key):
        for k, v in self._items:
            if k == key:
                return True
        return False

    has_key = __contains__

    def clear(self):
        self._items = []

    def copy(self):
        return MultiDict(self)

    def setdefault(self, key, default=None):
        for k, v in self._items:
            if key == k:
                return v
        self._items.append((key, default))
        return default

    def pop(self, key, *args):
        if len(args) > 1:
            raise TypeError, "pop expected at most 2 arguments, got "\
                              + repr(1 + len(args))
        for i in range(len(self._items)):
            if self._items[i][0] == key:
                v = self._items[i][1]
                del self._items[i]
                return v
        if args:
            return args[0]
        else:
            raise KeyError(repr(key))

    def popitem(self):
        return self._items.pop()

    def update(self, other=None, **kwargs):
        if other is None:
            pass
        elif hasattr(other, 'items'):
            self._items.extend(other.items())
        elif hasattr(other, 'keys'):
            for k in other.keys():
                self._items.append((k, other[k]))
        else:
            for k, v in other:
                self._items.append((k, v))
        if kwargs:
            self.update(kwargs)

    def __repr__(self):
        items = ', '.join(['(%r, %r)' % v for v in self._items])
        return '%s([%s])' % (self.__class__.__name__, items)

    def __len__(self):
        return len(self._items)

    ##
    ## All the iteration:
    ##

    def keys(self):
        return [k for k, v in self._items]

    def iterkeys(self):
        for k, v in self._items:
            yield k

    __iter__ = iterkeys

    def items(self):
        return self._items[:]

    def iteritems(self):
        return iter(self._items)

    def values(self):
        return [v for k, v in self._items]

    def itervalues(self):
        for k, v in self._items:
            yield v

class UnicodeMultiDict(DictMixin):
    """
    A MultiDict wrapper that decodes returned values to unicode on the
    fly. Decoding is not applied to assigned values.

    The key/value contents are assumed to be ``str``/``strs`` or
    ``str``/``FieldStorages`` (as is returned by the ``paste.request.parse_``
    functions).

    Can optionally also decode keys when the ``decode_keys`` argument is
    True.

    ``FieldStorage`` instances are cloned, and the clone's ``filename``
    variable is decoded. Its ``name`` variable is decoded when ``decode_keys``
    is enabled.

    """
    def __init__(self, multi=None, encoding=None, errors='strict',
                 decode_keys=False):
        self.multi = multi
        if encoding is None:
            encoding = sys.getdefaultencoding()
        self.encoding = encoding
        self.errors = errors
        self.decode_keys = decode_keys

    def _decode_key(self, key):
        if self.decode_keys:
            try:
                key = key.decode(self.encoding, self.errors)
            except AttributeError:
                pass
        return key

    def _decode_value(self, value):
        """
        Decode the specified value to unicode. Assumes value is a ``str`` or
        `FieldStorage`` object.

        ``FieldStorage`` objects are specially handled.
        """
        if isinstance(value, cgi.FieldStorage):
            # decode FieldStorage's field name and filename
            value = copy.copy(value)
            if self.decode_keys:
                value.name = value.name.decode(self.encoding, self.errors)
            value.filename = value.filename.decode(self.encoding, self.errors)
        else:
            try:
                value = value.decode(self.encoding, self.errors)
            except AttributeError:
                pass
        return value

    def __getitem__(self, key):
        return self._decode_value(self.multi.__getitem__(key))

    def __setitem__(self, key, value):
        self.multi.__setitem__(key, value)

    def add(self, key, value):
        """
        Add the key and value, not overwriting any previous value.
        """
        self.multi.add(key, value)

    def getall(self, key):
        """
        Return a list of all values matching the key (may be an empty list)
        """
        return [self._decode_value(v) for v in self.multi.getall(key)]

    def getone(self, key):
        """
        Get one value matching the key, raising a KeyError if multiple
        values were found.
        """
        return self._decode_value(self.multi.getone(key))

    def mixed(self):
        """
        Returns a dictionary where the values are either single
        values, or a list of values when a key/value appears more than
        once in this dictionary.  This is similar to the kind of
        dictionary often used to represent the variables in a web
        request.
        """
        unicode_mixed = {}
        for key, value in self.multi.mixed().iteritems():
            if isinstance(value, list):
                value = [self._decode_value(value) for value in value]
            else:
                value = self._decode_value(value)
            unicode_mixed[self._decode_key(key)] = value
        return unicode_mixed

    def dict_of_lists(self):
        """
        Returns a dictionary where each key is associated with a
        list of values.
        """
        unicode_dict = {}
        for key, value in self.multi.dict_of_lists().iteritems():
            value = [self._decode_value(value) for value in value]
            unicode_dict[self._decode_key(key)] = value
        return unicode_dict

    def __delitem__(self, key):
        self.multi.__delitem__(key)

    def __contains__(self, key):
        return self.multi.__contains__(key)

    has_key = __contains__

    def clear(self):
        self.multi.clear()

    def copy(self):
        return UnicodeMultiDict(self.multi.copy(), self.encoding, self.errors)

    def setdefault(self, key, default=None):
        return self._decode_value(self.multi.setdefault(key, default))

    def pop(self, key, *args):
        return self._decode_value(self.multi.pop(key, *args))

    def popitem(self):
        k, v = self.multi.popitem()
        return (self._decode_key(k), self._decode_value(v))

    def __repr__(self):
        items = ', '.join(['(%r, %r)' % v for v in self.items()])
        return '%s([%s])' % (self.__class__.__name__, items)

    def __len__(self):
        return self.multi.__len__()

    ##
    ## All the iteration:
    ##

    def keys(self):
        return [self._decode_key(k) for k in self.multi.iterkeys()]

    def iterkeys(self):
        for k in self.multi.iterkeys():
            yield self._decode_key(k)

    __iter__ = iterkeys

    def items(self):
        return [(self._decode_key(k), self._decode_value(v)) for \
                    k, v in self.multi.iteritems()]

    def iteritems(self):
        for k, v in self.multi.iteritems():
            yield (self._decode_key(k), self._decode_value(v))

    def values(self):
        return [self._decode_value(v) for v in self.multi.itervalues()]

    def itervalues(self):
        for v in self.multi.itervalues():
            yield self._decode_value(v)

__test__ = {
    'general': """
    >>> d = MultiDict(a=1, b=2)
    >>> d['a']
    1
    >>> d.getall('c')
    []
    >>> d.add('a', 2)
    >>> d['a']
    1
    >>> d.getall('a')
    [1, 2]
    >>> d['b'] = 4
    >>> d.getall('b')
    [4]
    >>> d.keys()
    ['a', 'a', 'b']
    >>> d.items()
    [('a', 1), ('a', 2), ('b', 4)]
    >>> d.mixed()
    {'a': [1, 2], 'b': 4}
    >>> MultiDict([('a', 'b')], c=2)
    MultiDict([('a', 'b'), ('c', 2)])
    """}

if __name__ == '__main__':
    import doctest
    doctest.testmod()