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Edit File: _utils.py

import itertools
import json
import pkgutil
import re

from jsonschema.compat import MutableMapping, str_types, urlsplit

class URIDict(MutableMapping):
    """
    Dictionary which uses normalized URIs as keys.
    """

def normalize(self, uri):
        return urlsplit(uri).geturl()

def __init__(self, *args, **kwargs):
        self.store = dict()
        self.store.update(*args, **kwargs)

def __getitem__(self, uri):
        return self.store[self.normalize(uri)]

def __setitem__(self, uri, value):
        self.store[self.normalize(uri)] = value

def __delitem__(self, uri):
        del self.store[self.normalize(uri)]

def __iter__(self):
        return iter(self.store)

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

def __repr__(self):
        return repr(self.store)

class Unset(object):
    """
    An as-of-yet unset attribute or unprovided default parameter.
    """

def __repr__(self):
        return "<unset>"

def load_schema(name):
    """
    Load a schema from ./schemas/``name``.json and return it.
    """

data = pkgutil.get_data("jsonschema", "schemas/{0}.json".format(name))
    return json.loads(data.decode("utf-8"))

def indent(string, times=1):
    """
    A dumb version of `textwrap.indent` from Python 3.3.
    """

return "\n".join(" " * (4 * times) + line for line in string.splitlines())

def format_as_index(indices):
    """
    Construct a single string containing indexing operations for the indices.

For example, [1, 2, "foo"] -> [1][2]["foo"]

Arguments:

indices (sequence):

The indices to format.
    """

if not indices:
        return ""
    return "[%s]" % "][".join(repr(index) for index in indices)

def find_additional_properties(instance, schema):
    """
    Return the set of additional properties for the given ``instance``.

Weeds out properties that should have been validated by ``properties`` and
    / or ``patternProperties``.

Assumes ``instance`` is dict-like already.
    """

properties = schema.get("properties", {})
    patterns = "|".join(schema.get("patternProperties", {}))
    for property in instance:
        if property not in properties:
            if patterns and re.search(patterns, property):
                continue
            yield property

def extras_msg(extras):
    """
    Create an error message for extra items or properties.
    """

if len(extras) == 1:
        verb = "was"
    else:
        verb = "were"
    return ", ".join(repr(extra) for extra in extras), verb

def types_msg(instance, types):
    """
    Create an error message for a failure to match the given types.

If the ``instance`` is an object and contains a ``name`` property, it will
    be considered to be a description of that object and used as its type.

Otherwise the message is simply the reprs of the given ``types``.
    """

reprs = []
    for type in types:
        try:
            reprs.append(repr(type["name"]))
        except Exception:
            reprs.append(repr(type))
    return "%r is not of type %s" % (instance, ", ".join(reprs))

def flatten(suitable_for_isinstance):
    """
    isinstance() can accept a bunch of really annoying different types:
        * a single type
        * a tuple of types
        * an arbitrary nested tree of tuples

Return a flattened tuple of the given argument.
    """

types = set()

if not isinstance(suitable_for_isinstance, tuple):
        suitable_for_isinstance = (suitable_for_isinstance,)
    for thing in suitable_for_isinstance:
        if isinstance(thing, tuple):
            types.update(flatten(thing))
        else:
            types.add(thing)
    return tuple(types)

def ensure_list(thing):
    """
    Wrap ``thing`` in a list if it's a single str.

Otherwise, return it unchanged.
    """

if isinstance(thing, str_types):
        return [thing]
    return thing

def equal(one, two):
    """
    Check if two things are equal, but evade booleans and ints being equal.
    """
    return unbool(one) == unbool(two)

def unbool(element, true=object(), false=object()):
    """
    A hack to make True and 1 and False and 0 unique for ``uniq``.
    """

if element is True:
        return true
    elif element is False:
        return false
    return element

def uniq(container):
    """
    Check if all of a container's elements are unique.

Successively tries first to rely that the elements are hashable, then
    falls back on them being sortable, and finally falls back on brute
    force.
    """

try:
        return len(set(unbool(i) for i in container)) == len(container)
    except TypeError:
        try:
            sort = sorted(unbool(i) for i in container)
            sliced = itertools.islice(sort, 1, None)
            for i, j in zip(sort, sliced):
                if i == j:
                    return False
        except (NotImplementedError, TypeError):
            seen = []
            for e in container:
                e = unbool(e)
                if e in seen:
                    return False
                seen.append(e)
    return True