????
Your IP : 216.73.216.11
from __future__ import annotations
import re
import typing as t
import uuid
from urllib.parse import quote
if t.TYPE_CHECKING:
from .map import Map
class ValidationError(ValueError):
"""Validation error. If a rule converter raises this exception the rule
does not match the current URL and the next URL is tried.
"""
class BaseConverter:
"""Base class for all converters.
.. versionchanged:: 2.3
``part_isolating`` defaults to ``False`` if ``regex`` contains a ``/``.
"""
regex = "[^/]+"
weight = 100
part_isolating = True
def __init_subclass__(cls, **kwargs: t.Any) -> None:
super().__init_subclass__(**kwargs)
# If the converter isn't inheriting its regex, disable part_isolating by default
# if the regex contains a / character.
if "regex" in cls.__dict__ and "part_isolating" not in cls.__dict__:
cls.part_isolating = "/" not in cls.regex
def __init__(self, map: Map, *args: t.Any, **kwargs: t.Any) -> None:
self.map = map
def to_python(self, value: str) -> t.Any:
return value
def to_url(self, value: t.Any) -> str:
# safe = https://url.spec.whatwg.org/#url-path-segment-string
return quote(str(value), safe="!$&'()*+,/:;=@")
class UnicodeConverter(BaseConverter):
"""This converter is the default converter and accepts any string but
only one path segment. Thus the string can not include a slash.
This is the default validator.
Example::
Rule('/pages/<page>'),
Rule('/<string(length=2):lang_code>')
:param map: the :class:`Map`.
:param minlength: the minimum length of the string. Must be greater
or equal 1.
:param maxlength: the maximum length of the string.
:param length: the exact length of the string.
"""
def __init__(
self,
map: Map,
minlength: int = 1,
maxlength: int | None = None,
length: int | None = None,
) -> None:
super().__init__(map)
if length is not None:
length_regex = f"{{{int(length)}}}"
else:
if maxlength is None:
maxlength_value = ""
else:
maxlength_value = str(int(maxlength))
length_regex = f"{{{int(minlength)},{maxlength_value}}}"
self.regex = f"[^/]{length_regex}"
class AnyConverter(BaseConverter):
"""Matches one of the items provided. Items can either be Python
identifiers or strings::
Rule('/<any(about, help, imprint, class, "foo,bar"):page_name>')
:param map: the :class:`Map`.
:param items: this function accepts the possible items as positional
arguments.
.. versionchanged:: 2.2
Value is validated when building a URL.
"""
def __init__(self, map: Map, *items: str) -> None:
super().__init__(map)
self.items = set(items)
self.regex = f"(?:{'|'.join([re.escape(x) for x in items])})"
def to_url(self, value: t.Any) -> str:
if value in self.items:
return str(value)
valid_values = ", ".join(f"'{item}'" for item in sorted(self.items))
raise ValueError(f"'{value}' is not one of {valid_values}")
class PathConverter(BaseConverter):
"""Like the default :class:`UnicodeConverter`, but it also matches
slashes. This is useful for wikis and similar applications::
Rule('/<path:wikipage>')
Rule('/<path:wikipage>/edit')
:param map: the :class:`Map`.
"""
part_isolating = False
regex = "[^/].*?"
weight = 200
class NumberConverter(BaseConverter):
"""Baseclass for `IntegerConverter` and `FloatConverter`.
:internal:
"""
weight = 50
num_convert: t.Callable[[t.Any], t.Any] = int
def __init__(
self,
map: Map,
fixed_digits: int = 0,
min: int | None = None,
max: int | None = None,
signed: bool = False,
) -> None:
if signed:
self.regex = self.signed_regex
super().__init__(map)
self.fixed_digits = fixed_digits
self.min = min
self.max = max
self.signed = signed
def to_python(self, value: str) -> t.Any:
if self.fixed_digits and len(value) != self.fixed_digits:
raise ValidationError()
value_num = self.num_convert(value)
if (self.min is not None and value_num < self.min) or (
self.max is not None and value_num > self.max
):
raise ValidationError()
return value_num
def to_url(self, value: t.Any) -> str:
value_str = str(self.num_convert(value))
if self.fixed_digits:
value_str = value_str.zfill(self.fixed_digits)
return value_str
@property
def signed_regex(self) -> str:
return f"-?{self.regex}"
class IntegerConverter(NumberConverter):
"""This converter only accepts integer values::
Rule("/page/<int:page>")
By default it only accepts unsigned, positive values. The ``signed``
parameter will enable signed, negative values. ::
Rule("/page/<int(signed=True):page>")
:param map: The :class:`Map`.
:param fixed_digits: The number of fixed digits in the URL. If you
set this to ``4`` for example, the rule will only match if the
URL looks like ``/0001/``. The default is variable length.
:param min: The minimal value.
:param max: The maximal value.
:param signed: Allow signed (negative) values.
.. versionadded:: 0.15
The ``signed`` parameter.
"""
regex = r"\d+"
class FloatConverter(NumberConverter):
"""This converter only accepts floating point values::
Rule("/probability/<float:probability>")
By default it only accepts unsigned, positive values. The ``signed``
parameter will enable signed, negative values. ::
Rule("/offset/<float(signed=True):offset>")
:param map: The :class:`Map`.
:param min: The minimal value.
:param max: The maximal value.
:param signed: Allow signed (negative) values.
.. versionadded:: 0.15
The ``signed`` parameter.
"""
regex = r"\d+\.\d+"
num_convert = float
def __init__(
self,
map: Map,
min: float | None = None,
max: float | None = None,
signed: bool = False,
) -> None:
super().__init__(map, min=min, max=max, signed=signed) # type: ignore
class UUIDConverter(BaseConverter):
"""This converter only accepts UUID strings::
Rule('/object/<uuid:identifier>')
.. versionadded:: 0.10
:param map: the :class:`Map`.
"""
regex = (
r"[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-"
r"[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}"
)
def to_python(self, value: str) -> uuid.UUID:
return uuid.UUID(value)
def to_url(self, value: uuid.UUID) -> str:
return str(value)
#: the default converter mapping for the map.
DEFAULT_CONVERTERS: t.Mapping[str, type[BaseConverter]] = {
"default": UnicodeConverter,
"string": UnicodeConverter,
"any": AnyConverter,
"path": PathConverter,
"int": IntegerConverter,
"float": FloatConverter,
"uuid": UUIDConverter,
}