756 lines
23 KiB
Python
756 lines
23 KiB
Python
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import enum
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import json
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import os
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import re
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import typing as t
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from collections import abc
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from collections import deque
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from random import choice
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from random import randrange
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from threading import Lock
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from types import CodeType
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from urllib.parse import quote_from_bytes
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import markupsafe
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if t.TYPE_CHECKING:
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import typing_extensions as te
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F = t.TypeVar("F", bound=t.Callable[..., t.Any])
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# special singleton representing missing values for the runtime
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missing: t.Any = type("MissingType", (), {"__repr__": lambda x: "missing"})()
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internal_code: t.MutableSet[CodeType] = set()
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concat = "".join
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def pass_context(f: F) -> F:
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"""Pass the :class:`~jinja2.runtime.Context` as the first argument
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to the decorated function when called while rendering a template.
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Can be used on functions, filters, and tests.
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If only ``Context.eval_context`` is needed, use
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:func:`pass_eval_context`. If only ``Context.environment`` is
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needed, use :func:`pass_environment`.
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.. versionadded:: 3.0.0
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Replaces ``contextfunction`` and ``contextfilter``.
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"""
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f.jinja_pass_arg = _PassArg.context # type: ignore
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return f
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def pass_eval_context(f: F) -> F:
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"""Pass the :class:`~jinja2.nodes.EvalContext` as the first argument
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to the decorated function when called while rendering a template.
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See :ref:`eval-context`.
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Can be used on functions, filters, and tests.
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If only ``EvalContext.environment`` is needed, use
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:func:`pass_environment`.
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.. versionadded:: 3.0.0
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Replaces ``evalcontextfunction`` and ``evalcontextfilter``.
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"""
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f.jinja_pass_arg = _PassArg.eval_context # type: ignore
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return f
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def pass_environment(f: F) -> F:
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"""Pass the :class:`~jinja2.Environment` as the first argument to
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the decorated function when called while rendering a template.
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Can be used on functions, filters, and tests.
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.. versionadded:: 3.0.0
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Replaces ``environmentfunction`` and ``environmentfilter``.
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"""
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f.jinja_pass_arg = _PassArg.environment # type: ignore
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return f
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class _PassArg(enum.Enum):
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context = enum.auto()
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eval_context = enum.auto()
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environment = enum.auto()
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@classmethod
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def from_obj(cls, obj: F) -> t.Optional["_PassArg"]:
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if hasattr(obj, "jinja_pass_arg"):
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return obj.jinja_pass_arg # type: ignore
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return None
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def internalcode(f: F) -> F:
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"""Marks the function as internally used"""
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internal_code.add(f.__code__)
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return f
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def is_undefined(obj: t.Any) -> bool:
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"""Check if the object passed is undefined. This does nothing more than
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performing an instance check against :class:`Undefined` but looks nicer.
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This can be used for custom filters or tests that want to react to
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undefined variables. For example a custom default filter can look like
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this::
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def default(var, default=''):
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if is_undefined(var):
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return default
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return var
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"""
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from .runtime import Undefined
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return isinstance(obj, Undefined)
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def consume(iterable: t.Iterable[t.Any]) -> None:
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"""Consumes an iterable without doing anything with it."""
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for _ in iterable:
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pass
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def clear_caches() -> None:
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"""Jinja keeps internal caches for environments and lexers. These are
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used so that Jinja doesn't have to recreate environments and lexers all
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the time. Normally you don't have to care about that but if you are
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measuring memory consumption you may want to clean the caches.
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"""
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from .environment import get_spontaneous_environment
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from .lexer import _lexer_cache
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get_spontaneous_environment.cache_clear()
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_lexer_cache.clear()
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def import_string(import_name: str, silent: bool = False) -> t.Any:
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"""Imports an object based on a string. This is useful if you want to
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use import paths as endpoints or something similar. An import path can
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be specified either in dotted notation (``xml.sax.saxutils.escape``)
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or with a colon as object delimiter (``xml.sax.saxutils:escape``).
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If the `silent` is True the return value will be `None` if the import
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fails.
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:return: imported object
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"""
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try:
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if ":" in import_name:
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module, obj = import_name.split(":", 1)
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elif "." in import_name:
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module, _, obj = import_name.rpartition(".")
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else:
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return __import__(import_name)
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return getattr(__import__(module, None, None, [obj]), obj)
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except (ImportError, AttributeError):
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if not silent:
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raise
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def open_if_exists(filename: str, mode: str = "rb") -> t.Optional[t.IO]:
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"""Returns a file descriptor for the filename if that file exists,
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otherwise ``None``.
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"""
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if not os.path.isfile(filename):
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return None
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return open(filename, mode)
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def object_type_repr(obj: t.Any) -> str:
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"""Returns the name of the object's type. For some recognized
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singletons the name of the object is returned instead. (For
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example for `None` and `Ellipsis`).
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"""
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if obj is None:
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return "None"
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elif obj is Ellipsis:
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return "Ellipsis"
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cls = type(obj)
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if cls.__module__ == "builtins":
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return f"{cls.__name__} object"
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return f"{cls.__module__}.{cls.__name__} object"
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def pformat(obj: t.Any) -> str:
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"""Format an object using :func:`pprint.pformat`."""
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from pprint import pformat # type: ignore
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return pformat(obj)
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_http_re = re.compile(
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r"""
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^
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(
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(https?://|www\.) # scheme or www
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(([\w%-]+\.)+)? # subdomain
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(
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[a-z]{2,63} # basic tld
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xn--[\w%]{2,59} # idna tld
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)
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([\w%-]{2,63}\.)+ # basic domain
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(com|net|int|edu|gov|org|info|mil) # basic tld
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(https?://) # scheme
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(
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(([\d]{1,3})(\.[\d]{1,3}){3}) # IPv4
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(\[([\da-f]{0,4}:){2}([\da-f]{0,4}:?){1,6}]) # IPv6
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)
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)
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(?::[\d]{1,5})? # port
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(?:[/?#]\S*)? # path, query, and fragment
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$
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""",
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re.IGNORECASE | re.VERBOSE,
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)
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_email_re = re.compile(r"^\S+@\w[\w.-]*\.\w+$")
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def urlize(
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text: str,
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trim_url_limit: t.Optional[int] = None,
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rel: t.Optional[str] = None,
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target: t.Optional[str] = None,
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extra_schemes: t.Optional[t.Iterable[str]] = None,
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) -> str:
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"""Convert URLs in text into clickable links.
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This may not recognize links in some situations. Usually, a more
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comprehensive formatter, such as a Markdown library, is a better
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choice.
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Works on ``http://``, ``https://``, ``www.``, ``mailto:``, and email
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addresses. Links with trailing punctuation (periods, commas, closing
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parentheses) and leading punctuation (opening parentheses) are
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recognized excluding the punctuation. Email addresses that include
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header fields are not recognized (for example,
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``mailto:address@example.com?cc=copy@example.com``).
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:param text: Original text containing URLs to link.
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:param trim_url_limit: Shorten displayed URL values to this length.
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:param target: Add the ``target`` attribute to links.
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:param rel: Add the ``rel`` attribute to links.
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:param extra_schemes: Recognize URLs that start with these schemes
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in addition to the default behavior.
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.. versionchanged:: 3.0
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The ``extra_schemes`` parameter was added.
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.. versionchanged:: 3.0
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Generate ``https://`` links for URLs without a scheme.
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.. versionchanged:: 3.0
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The parsing rules were updated. Recognize email addresses with
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or without the ``mailto:`` scheme. Validate IP addresses. Ignore
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parentheses and brackets in more cases.
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"""
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if trim_url_limit is not None:
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def trim_url(x: str) -> str:
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if len(x) > trim_url_limit: # type: ignore
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return f"{x[:trim_url_limit]}..."
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return x
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else:
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def trim_url(x: str) -> str:
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return x
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words = re.split(r"(\s+)", str(markupsafe.escape(text)))
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rel_attr = f' rel="{markupsafe.escape(rel)}"' if rel else ""
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target_attr = f' target="{markupsafe.escape(target)}"' if target else ""
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for i, word in enumerate(words):
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head, middle, tail = "", word, ""
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match = re.match(r"^([(<]|<)+", middle)
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if match:
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head = match.group()
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middle = middle[match.end() :]
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# Unlike lead, which is anchored to the start of the string,
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# need to check that the string ends with any of the characters
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# before trying to match all of them, to avoid backtracking.
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if middle.endswith((")", ">", ".", ",", "\n", ">")):
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match = re.search(r"([)>.,\n]|>)+$", middle)
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if match:
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tail = match.group()
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middle = middle[: match.start()]
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# Prefer balancing parentheses in URLs instead of ignoring a
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# trailing character.
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for start_char, end_char in ("(", ")"), ("<", ">"), ("<", ">"):
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start_count = middle.count(start_char)
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if start_count <= middle.count(end_char):
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# Balanced, or lighter on the left
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continue
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# Move as many as possible from the tail to balance
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for _ in range(min(start_count, tail.count(end_char))):
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end_index = tail.index(end_char) + len(end_char)
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# Move anything in the tail before the end char too
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middle += tail[:end_index]
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tail = tail[end_index:]
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if _http_re.match(middle):
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if middle.startswith("https://") or middle.startswith("http://"):
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middle = (
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f'<a href="{middle}"{rel_attr}{target_attr}>{trim_url(middle)}</a>'
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)
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else:
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middle = (
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f'<a href="https://{middle}"{rel_attr}{target_attr}>'
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f"{trim_url(middle)}</a>"
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)
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elif middle.startswith("mailto:") and _email_re.match(middle[7:]):
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middle = f'<a href="{middle}">{middle[7:]}</a>'
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elif (
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"@" in middle
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and not middle.startswith("www.")
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and ":" not in middle
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and _email_re.match(middle)
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):
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middle = f'<a href="mailto:{middle}">{middle}</a>'
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elif extra_schemes is not None:
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for scheme in extra_schemes:
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if middle != scheme and middle.startswith(scheme):
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middle = f'<a href="{middle}"{rel_attr}{target_attr}>{middle}</a>'
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words[i] = f"{head}{middle}{tail}"
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return "".join(words)
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def generate_lorem_ipsum(
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n: int = 5, html: bool = True, min: int = 20, max: int = 100
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) -> str:
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"""Generate some lorem ipsum for the template."""
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from .constants import LOREM_IPSUM_WORDS
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words = LOREM_IPSUM_WORDS.split()
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result = []
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for _ in range(n):
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next_capitalized = True
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last_comma = last_fullstop = 0
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word = None
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last = None
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p = []
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# each paragraph contains out of 20 to 100 words.
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for idx, _ in enumerate(range(randrange(min, max))):
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while True:
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word = choice(words)
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if word != last:
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last = word
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break
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if next_capitalized:
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word = word.capitalize()
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next_capitalized = False
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# add commas
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if idx - randrange(3, 8) > last_comma:
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last_comma = idx
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last_fullstop += 2
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word += ","
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# add end of sentences
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if idx - randrange(10, 20) > last_fullstop:
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last_comma = last_fullstop = idx
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word += "."
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next_capitalized = True
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p.append(word)
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# ensure that the paragraph ends with a dot.
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p_str = " ".join(p)
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if p_str.endswith(","):
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p_str = p_str[:-1] + "."
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elif not p_str.endswith("."):
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|
p_str += "."
|
||
|
|
|
||
|
|
result.append(p_str)
|
||
|
|
|
||
|
|
if not html:
|
||
|
|
return "\n\n".join(result)
|
||
|
|
return markupsafe.Markup(
|
||
|
|
"\n".join(f"<p>{markupsafe.escape(x)}</p>" for x in result)
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def url_quote(obj: t.Any, charset: str = "utf-8", for_qs: bool = False) -> str:
|
||
|
|
"""Quote a string for use in a URL using the given charset.
|
||
|
|
|
||
|
|
:param obj: String or bytes to quote. Other types are converted to
|
||
|
|
string then encoded to bytes using the given charset.
|
||
|
|
:param charset: Encode text to bytes using this charset.
|
||
|
|
:param for_qs: Quote "/" and use "+" for spaces.
|
||
|
|
"""
|
||
|
|
if not isinstance(obj, bytes):
|
||
|
|
if not isinstance(obj, str):
|
||
|
|
obj = str(obj)
|
||
|
|
|
||
|
|
obj = obj.encode(charset)
|
||
|
|
|
||
|
|
safe = b"" if for_qs else b"/"
|
||
|
|
rv = quote_from_bytes(obj, safe)
|
||
|
|
|
||
|
|
if for_qs:
|
||
|
|
rv = rv.replace("%20", "+")
|
||
|
|
|
||
|
|
return rv
|
||
|
|
|
||
|
|
|
||
|
|
@abc.MutableMapping.register
|
||
|
|
class LRUCache:
|
||
|
|
"""A simple LRU Cache implementation."""
|
||
|
|
|
||
|
|
# this is fast for small capacities (something below 1000) but doesn't
|
||
|
|
# scale. But as long as it's only used as storage for templates this
|
||
|
|
# won't do any harm.
|
||
|
|
|
||
|
|
def __init__(self, capacity: int) -> None:
|
||
|
|
self.capacity = capacity
|
||
|
|
self._mapping: t.Dict[t.Any, t.Any] = {}
|
||
|
|
self._queue: "te.Deque[t.Any]" = deque()
|
||
|
|
self._postinit()
|
||
|
|
|
||
|
|
def _postinit(self) -> None:
|
||
|
|
# alias all queue methods for faster lookup
|
||
|
|
self._popleft = self._queue.popleft
|
||
|
|
self._pop = self._queue.pop
|
||
|
|
self._remove = self._queue.remove
|
||
|
|
self._wlock = Lock()
|
||
|
|
self._append = self._queue.append
|
||
|
|
|
||
|
|
def __getstate__(self) -> t.Mapping[str, t.Any]:
|
||
|
|
return {
|
||
|
|
"capacity": self.capacity,
|
||
|
|
"_mapping": self._mapping,
|
||
|
|
"_queue": self._queue,
|
||
|
|
}
|
||
|
|
|
||
|
|
def __setstate__(self, d: t.Mapping[str, t.Any]) -> None:
|
||
|
|
self.__dict__.update(d)
|
||
|
|
self._postinit()
|
||
|
|
|
||
|
|
def __getnewargs__(self) -> t.Tuple:
|
||
|
|
return (self.capacity,)
|
||
|
|
|
||
|
|
def copy(self) -> "LRUCache":
|
||
|
|
"""Return a shallow copy of the instance."""
|
||
|
|
rv = self.__class__(self.capacity)
|
||
|
|
rv._mapping.update(self._mapping)
|
||
|
|
rv._queue.extend(self._queue)
|
||
|
|
return rv
|
||
|
|
|
||
|
|
def get(self, key: t.Any, default: t.Any = None) -> t.Any:
|
||
|
|
"""Return an item from the cache dict or `default`"""
|
||
|
|
try:
|
||
|
|
return self[key]
|
||
|
|
except KeyError:
|
||
|
|
return default
|
||
|
|
|
||
|
|
def setdefault(self, key: t.Any, default: t.Any = None) -> t.Any:
|
||
|
|
"""Set `default` if the key is not in the cache otherwise
|
||
|
|
leave unchanged. Return the value of this key.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
return self[key]
|
||
|
|
except KeyError:
|
||
|
|
self[key] = default
|
||
|
|
return default
|
||
|
|
|
||
|
|
def clear(self) -> None:
|
||
|
|
"""Clear the cache."""
|
||
|
|
with self._wlock:
|
||
|
|
self._mapping.clear()
|
||
|
|
self._queue.clear()
|
||
|
|
|
||
|
|
def __contains__(self, key: t.Any) -> bool:
|
||
|
|
"""Check if a key exists in this cache."""
|
||
|
|
return key in self._mapping
|
||
|
|
|
||
|
|
def __len__(self) -> int:
|
||
|
|
"""Return the current size of the cache."""
|
||
|
|
return len(self._mapping)
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
return f"<{type(self).__name__} {self._mapping!r}>"
|
||
|
|
|
||
|
|
def __getitem__(self, key: t.Any) -> t.Any:
|
||
|
|
"""Get an item from the cache. Moves the item up so that it has the
|
||
|
|
highest priority then.
|
||
|
|
|
||
|
|
Raise a `KeyError` if it does not exist.
|
||
|
|
"""
|
||
|
|
with self._wlock:
|
||
|
|
rv = self._mapping[key]
|
||
|
|
|
||
|
|
if self._queue[-1] != key:
|
||
|
|
try:
|
||
|
|
self._remove(key)
|
||
|
|
except ValueError:
|
||
|
|
# if something removed the key from the container
|
||
|
|
# when we read, ignore the ValueError that we would
|
||
|
|
# get otherwise.
|
||
|
|
pass
|
||
|
|
|
||
|
|
self._append(key)
|
||
|
|
|
||
|
|
return rv
|
||
|
|
|
||
|
|
def __setitem__(self, key: t.Any, value: t.Any) -> None:
|
||
|
|
"""Sets the value for an item. Moves the item up so that it
|
||
|
|
has the highest priority then.
|
||
|
|
"""
|
||
|
|
with self._wlock:
|
||
|
|
if key in self._mapping:
|
||
|
|
self._remove(key)
|
||
|
|
elif len(self._mapping) == self.capacity:
|
||
|
|
del self._mapping[self._popleft()]
|
||
|
|
|
||
|
|
self._append(key)
|
||
|
|
self._mapping[key] = value
|
||
|
|
|
||
|
|
def __delitem__(self, key: t.Any) -> None:
|
||
|
|
"""Remove an item from the cache dict.
|
||
|
|
Raise a `KeyError` if it does not exist.
|
||
|
|
"""
|
||
|
|
with self._wlock:
|
||
|
|
del self._mapping[key]
|
||
|
|
|
||
|
|
try:
|
||
|
|
self._remove(key)
|
||
|
|
except ValueError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def items(self) -> t.Iterable[t.Tuple[t.Any, t.Any]]:
|
||
|
|
"""Return a list of items."""
|
||
|
|
result = [(key, self._mapping[key]) for key in list(self._queue)]
|
||
|
|
result.reverse()
|
||
|
|
return result
|
||
|
|
|
||
|
|
def values(self) -> t.Iterable[t.Any]:
|
||
|
|
"""Return a list of all values."""
|
||
|
|
return [x[1] for x in self.items()]
|
||
|
|
|
||
|
|
def keys(self) -> t.Iterable[t.Any]:
|
||
|
|
"""Return a list of all keys ordered by most recent usage."""
|
||
|
|
return list(self)
|
||
|
|
|
||
|
|
def __iter__(self) -> t.Iterator[t.Any]:
|
||
|
|
return reversed(tuple(self._queue))
|
||
|
|
|
||
|
|
def __reversed__(self) -> t.Iterator[t.Any]:
|
||
|
|
"""Iterate over the keys in the cache dict, oldest items
|
||
|
|
coming first.
|
||
|
|
"""
|
||
|
|
return iter(tuple(self._queue))
|
||
|
|
|
||
|
|
__copy__ = copy
|
||
|
|
|
||
|
|
|
||
|
|
def select_autoescape(
|
||
|
|
enabled_extensions: t.Collection[str] = ("html", "htm", "xml"),
|
||
|
|
disabled_extensions: t.Collection[str] = (),
|
||
|
|
default_for_string: bool = True,
|
||
|
|
default: bool = False,
|
||
|
|
) -> t.Callable[[t.Optional[str]], bool]:
|
||
|
|
"""Intelligently sets the initial value of autoescaping based on the
|
||
|
|
filename of the template. This is the recommended way to configure
|
||
|
|
autoescaping if you do not want to write a custom function yourself.
|
||
|
|
|
||
|
|
If you want to enable it for all templates created from strings or
|
||
|
|
for all templates with `.html` and `.xml` extensions::
|
||
|
|
|
||
|
|
from jinja2 import Environment, select_autoescape
|
||
|
|
env = Environment(autoescape=select_autoescape(
|
||
|
|
enabled_extensions=('html', 'xml'),
|
||
|
|
default_for_string=True,
|
||
|
|
))
|
||
|
|
|
||
|
|
Example configuration to turn it on at all times except if the template
|
||
|
|
ends with `.txt`::
|
||
|
|
|
||
|
|
from jinja2 import Environment, select_autoescape
|
||
|
|
env = Environment(autoescape=select_autoescape(
|
||
|
|
disabled_extensions=('txt',),
|
||
|
|
default_for_string=True,
|
||
|
|
default=True,
|
||
|
|
))
|
||
|
|
|
||
|
|
The `enabled_extensions` is an iterable of all the extensions that
|
||
|
|
autoescaping should be enabled for. Likewise `disabled_extensions` is
|
||
|
|
a list of all templates it should be disabled for. If a template is
|
||
|
|
loaded from a string then the default from `default_for_string` is used.
|
||
|
|
If nothing matches then the initial value of autoescaping is set to the
|
||
|
|
value of `default`.
|
||
|
|
|
||
|
|
For security reasons this function operates case insensitive.
|
||
|
|
|
||
|
|
.. versionadded:: 2.9
|
||
|
|
"""
|
||
|
|
enabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in enabled_extensions)
|
||
|
|
disabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in disabled_extensions)
|
||
|
|
|
||
|
|
def autoescape(template_name: t.Optional[str]) -> bool:
|
||
|
|
if template_name is None:
|
||
|
|
return default_for_string
|
||
|
|
template_name = template_name.lower()
|
||
|
|
if template_name.endswith(enabled_patterns):
|
||
|
|
return True
|
||
|
|
if template_name.endswith(disabled_patterns):
|
||
|
|
return False
|
||
|
|
return default
|
||
|
|
|
||
|
|
return autoescape
|
||
|
|
|
||
|
|
|
||
|
|
def htmlsafe_json_dumps(
|
||
|
|
obj: t.Any, dumps: t.Optional[t.Callable[..., str]] = None, **kwargs: t.Any
|
||
|
|
) -> markupsafe.Markup:
|
||
|
|
"""Serialize an object to a string of JSON with :func:`json.dumps`,
|
||
|
|
then replace HTML-unsafe characters with Unicode escapes and mark
|
||
|
|
the result safe with :class:`~markupsafe.Markup`.
|
||
|
|
|
||
|
|
This is available in templates as the ``|tojson`` filter.
|
||
|
|
|
||
|
|
The following characters are escaped: ``<``, ``>``, ``&``, ``'``.
|
||
|
|
|
||
|
|
The returned string is safe to render in HTML documents and
|
||
|
|
``<script>`` tags. The exception is in HTML attributes that are
|
||
|
|
double quoted; either use single quotes or the ``|forceescape``
|
||
|
|
filter.
|
||
|
|
|
||
|
|
:param obj: The object to serialize to JSON.
|
||
|
|
:param dumps: The ``dumps`` function to use. Defaults to
|
||
|
|
``env.policies["json.dumps_function"]``, which defaults to
|
||
|
|
:func:`json.dumps`.
|
||
|
|
:param kwargs: Extra arguments to pass to ``dumps``. Merged onto
|
||
|
|
``env.policies["json.dumps_kwargs"]``.
|
||
|
|
|
||
|
|
.. versionchanged:: 3.0
|
||
|
|
The ``dumper`` parameter is renamed to ``dumps``.
|
||
|
|
|
||
|
|
.. versionadded:: 2.9
|
||
|
|
"""
|
||
|
|
if dumps is None:
|
||
|
|
dumps = json.dumps
|
||
|
|
|
||
|
|
return markupsafe.Markup(
|
||
|
|
dumps(obj, **kwargs)
|
||
|
|
.replace("<", "\\u003c")
|
||
|
|
.replace(">", "\\u003e")
|
||
|
|
.replace("&", "\\u0026")
|
||
|
|
.replace("'", "\\u0027")
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class Cycler:
|
||
|
|
"""Cycle through values by yield them one at a time, then restarting
|
||
|
|
once the end is reached. Available as ``cycler`` in templates.
|
||
|
|
|
||
|
|
Similar to ``loop.cycle``, but can be used outside loops or across
|
||
|
|
multiple loops. For example, render a list of folders and files in a
|
||
|
|
list, alternating giving them "odd" and "even" classes.
|
||
|
|
|
||
|
|
.. code-block:: html+jinja
|
||
|
|
|
||
|
|
{% set row_class = cycler("odd", "even") %}
|
||
|
|
<ul class="browser">
|
||
|
|
{% for folder in folders %}
|
||
|
|
<li class="folder {{ row_class.next() }}">{{ folder }}
|
||
|
|
{% endfor %}
|
||
|
|
{% for file in files %}
|
||
|
|
<li class="file {{ row_class.next() }}">{{ file }}
|
||
|
|
{% endfor %}
|
||
|
|
</ul>
|
||
|
|
|
||
|
|
:param items: Each positional argument will be yielded in the order
|
||
|
|
given for each cycle.
|
||
|
|
|
||
|
|
.. versionadded:: 2.1
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, *items: t.Any) -> None:
|
||
|
|
if not items:
|
||
|
|
raise RuntimeError("at least one item has to be provided")
|
||
|
|
self.items = items
|
||
|
|
self.pos = 0
|
||
|
|
|
||
|
|
def reset(self) -> None:
|
||
|
|
"""Resets the current item to the first item."""
|
||
|
|
self.pos = 0
|
||
|
|
|
||
|
|
@property
|
||
|
|
def current(self) -> t.Any:
|
||
|
|
"""Return the current item. Equivalent to the item that will be
|
||
|
|
returned next time :meth:`next` is called.
|
||
|
|
"""
|
||
|
|
return self.items[self.pos]
|
||
|
|
|
||
|
|
def next(self) -> t.Any:
|
||
|
|
"""Return the current item, then advance :attr:`current` to the
|
||
|
|
next item.
|
||
|
|
"""
|
||
|
|
rv = self.current
|
||
|
|
self.pos = (self.pos + 1) % len(self.items)
|
||
|
|
return rv
|
||
|
|
|
||
|
|
__next__ = next
|
||
|
|
|
||
|
|
|
||
|
|
class Joiner:
|
||
|
|
"""A joining helper for templates."""
|
||
|
|
|
||
|
|
def __init__(self, sep: str = ", ") -> None:
|
||
|
|
self.sep = sep
|
||
|
|
self.used = False
|
||
|
|
|
||
|
|
def __call__(self) -> str:
|
||
|
|
if not self.used:
|
||
|
|
self.used = True
|
||
|
|
return ""
|
||
|
|
return self.sep
|
||
|
|
|
||
|
|
|
||
|
|
class Namespace:
|
||
|
|
"""A namespace object that can hold arbitrary attributes. It may be
|
||
|
|
initialized from a dictionary or with keyword arguments."""
|
||
|
|
|
||
|
|
def __init__(*args: t.Any, **kwargs: t.Any) -> None: # noqa: B902
|
||
|
|
self, args = args[0], args[1:]
|
||
|
|
self.__attrs = dict(*args, **kwargs)
|
||
|
|
|
||
|
|
def __getattribute__(self, name: str) -> t.Any:
|
||
|
|
# __class__ is needed for the awaitable check in async mode
|
||
|
|
if name in {"_Namespace__attrs", "__class__"}:
|
||
|
|
return object.__getattribute__(self, name)
|
||
|
|
try:
|
||
|
|
return self.__attrs[name]
|
||
|
|
except KeyError:
|
||
|
|
raise AttributeError(name) from None
|
||
|
|
|
||
|
|
def __setitem__(self, name: str, value: t.Any) -> None:
|
||
|
|
self.__attrs[name] = value
|
||
|
|
|
||
|
|
def __repr__(self) -> str:
|
||
|
|
return f"<Namespace {self.__attrs!r}>"
|