732 lines
22 KiB
Python
732 lines
22 KiB
Python
# -*- coding: utf-8 -*-
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import json
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import os
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import re
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import warnings
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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 markupsafe import escape
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from markupsafe import Markup
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from ._compat import abc
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from ._compat import string_types
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from ._compat import text_type
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from ._compat import url_quote
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_word_split_re = re.compile(r"(\s+)")
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_punctuation_re = re.compile(
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"^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$"
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% (
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"|".join(map(re.escape, ("(", "<", "<"))),
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"|".join(map(re.escape, (".", ",", ")", ">", "\n", ">"))),
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)
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)
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_simple_email_re = re.compile(r"^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$")
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_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
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_entity_re = re.compile(r"&([^;]+);")
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_letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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_digits = "0123456789"
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# special singleton representing missing values for the runtime
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missing = type("MissingType", (), {"__repr__": lambda x: "missing"})()
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# internal code
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internal_code = set()
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concat = u"".join
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_slash_escape = "\\/" not in json.dumps("/")
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def contextfunction(f):
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"""This decorator can be used to mark a function or method context callable.
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A context callable is passed the active :class:`Context` as first argument when
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called from the template. This is useful if a function wants to get access
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to the context or functions provided on the context object. For example
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a function that returns a sorted list of template variables the current
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template exports could look like this::
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@contextfunction
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def get_exported_names(context):
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return sorted(context.exported_vars)
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"""
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f.contextfunction = True
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return f
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def evalcontextfunction(f):
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"""This decorator can be used to mark a function or method as an eval
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context callable. This is similar to the :func:`contextfunction`
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but instead of passing the context, an evaluation context object is
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passed. For more information about the eval context, see
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:ref:`eval-context`.
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.. versionadded:: 2.4
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"""
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f.evalcontextfunction = True
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return f
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def environmentfunction(f):
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"""This decorator can be used to mark a function or method as environment
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callable. This decorator works exactly like the :func:`contextfunction`
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decorator just that the first argument is the active :class:`Environment`
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and not context.
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"""
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f.environmentfunction = True
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return f
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def internalcode(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):
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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):
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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():
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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 _spontaneous_environments
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from .lexer import _lexer_cache
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_spontaneous_environments.clear()
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_lexer_cache.clear()
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def import_string(import_name, silent=False):
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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, mode="rb"):
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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):
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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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# __builtin__ in 2.x, builtins in 3.x
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if cls.__module__ in ("__builtin__", "builtins"):
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name = cls.__name__
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else:
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name = cls.__module__ + "." + cls.__name__
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return "%s object" % name
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def pformat(obj, verbose=False):
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"""Prettyprint an object. Either use the `pretty` library or the
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builtin `pprint`.
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"""
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try:
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from pretty import pretty
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return pretty(obj, verbose=verbose)
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except ImportError:
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from pprint import pformat
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return pformat(obj)
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def urlize(text, trim_url_limit=None, rel=None, target=None):
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"""Converts any URLs in text into clickable links. Works on http://,
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https:// and www. links. Links can have trailing punctuation (periods,
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commas, close-parens) and leading punctuation (opening parens) and
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it'll still do the right thing.
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If trim_url_limit is not None, the URLs in link text will be limited
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to trim_url_limit characters.
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If nofollow is True, the URLs in link text will get a rel="nofollow"
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attribute.
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If target is not None, a target attribute will be added to the link.
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"""
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trim_url = (
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lambda x, limit=trim_url_limit: limit is not None
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and (x[:limit] + (len(x) >= limit and "..." or ""))
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or x
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)
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words = _word_split_re.split(text_type(escape(text)))
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rel_attr = rel and ' rel="%s"' % text_type(escape(rel)) or ""
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target_attr = target and ' target="%s"' % escape(target) or ""
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for i, word in enumerate(words):
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match = _punctuation_re.match(word)
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if match:
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lead, middle, trail = match.groups()
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if middle.startswith("www.") or (
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"@" not in middle
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and not middle.startswith("http://")
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and not middle.startswith("https://")
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and len(middle) > 0
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and middle[0] in _letters + _digits
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and (
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middle.endswith(".org")
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or middle.endswith(".net")
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or middle.endswith(".com")
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)
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):
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middle = '<a href="http://%s"%s%s>%s</a>' % (
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middle,
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rel_attr,
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target_attr,
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trim_url(middle),
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)
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if middle.startswith("http://") or middle.startswith("https://"):
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middle = '<a href="%s"%s%s>%s</a>' % (
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middle,
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rel_attr,
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target_attr,
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trim_url(middle),
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)
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if (
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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 _simple_email_re.match(middle)
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):
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middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
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if lead + middle + trail != word:
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words[i] = lead + middle + trail
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return u"".join(words)
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def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
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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 = u" ".join(p)
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if p.endswith(","):
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p = p[:-1] + "."
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elif not p.endswith("."):
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p += "."
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result.append(p)
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if not html:
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return u"\n\n".join(result)
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return Markup(u"\n".join(u"<p>%s</p>" % escape(x) for x in result))
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def unicode_urlencode(obj, charset="utf-8", for_qs=False):
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"""Quote a string for use in a URL using the given charset.
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This function is misnamed, it is a wrapper around
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:func:`urllib.parse.quote`.
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:param obj: String or bytes to quote. Other types are converted to
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string then encoded to bytes using the given charset.
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:param charset: Encode text to bytes using this charset.
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:param for_qs: Quote "/" and use "+" for spaces.
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"""
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if not isinstance(obj, string_types):
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obj = text_type(obj)
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if isinstance(obj, text_type):
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obj = obj.encode(charset)
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safe = b"" if for_qs else b"/"
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rv = url_quote(obj, safe)
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if not isinstance(rv, text_type):
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rv = rv.decode("utf-8")
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if for_qs:
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rv = rv.replace("%20", "+")
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return rv
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class LRUCache(object):
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"""A simple LRU Cache implementation."""
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# this is fast for small capacities (something below 1000) but doesn't
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# scale. But as long as it's only used as storage for templates this
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# won't do any harm.
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def __init__(self, capacity):
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self.capacity = capacity
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self._mapping = {}
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self._queue = deque()
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self._postinit()
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def _postinit(self):
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# alias all queue methods for faster lookup
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self._popleft = self._queue.popleft
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self._pop = self._queue.pop
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self._remove = self._queue.remove
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self._wlock = Lock()
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self._append = self._queue.append
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def __getstate__(self):
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return {
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"capacity": self.capacity,
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"_mapping": self._mapping,
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"_queue": self._queue,
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}
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def __setstate__(self, d):
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self.__dict__.update(d)
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self._postinit()
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def __getnewargs__(self):
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return (self.capacity,)
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def copy(self):
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"""Return a shallow copy of the instance."""
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rv = self.__class__(self.capacity)
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rv._mapping.update(self._mapping)
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rv._queue.extend(self._queue)
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return rv
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def get(self, key, default=None):
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"""Return an item from the cache dict or `default`"""
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try:
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return self[key]
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except KeyError:
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return default
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def setdefault(self, key, default=None):
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"""Set `default` if the key is not in the cache otherwise
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leave unchanged. Return the value of this key.
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"""
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try:
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return self[key]
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except KeyError:
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self[key] = default
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return default
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def clear(self):
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"""Clear the cache."""
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self._wlock.acquire()
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try:
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self._mapping.clear()
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self._queue.clear()
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finally:
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self._wlock.release()
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def __contains__(self, key):
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"""Check if a key exists in this cache."""
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return key in self._mapping
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def __len__(self):
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"""Return the current size of the cache."""
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return len(self._mapping)
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def __repr__(self):
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return "<%s %r>" % (self.__class__.__name__, self._mapping)
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def __getitem__(self, key):
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"""Get an item from the cache. Moves the item up so that it has the
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highest priority then.
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Raise a `KeyError` if it does not exist.
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"""
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self._wlock.acquire()
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try:
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rv = self._mapping[key]
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if self._queue[-1] != key:
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try:
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self._remove(key)
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except ValueError:
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# if something removed the key from the container
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# when we read, ignore the ValueError that we would
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# get otherwise.
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pass
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self._append(key)
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return rv
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finally:
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self._wlock.release()
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def __setitem__(self, key, value):
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"""Sets the value for an item. Moves the item up so that it
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has the highest priority then.
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"""
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self._wlock.acquire()
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try:
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if key in self._mapping:
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self._remove(key)
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elif len(self._mapping) == self.capacity:
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del self._mapping[self._popleft()]
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self._append(key)
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self._mapping[key] = value
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finally:
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self._wlock.release()
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def __delitem__(self, key):
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"""Remove an item from the cache dict.
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Raise a `KeyError` if it does not exist.
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"""
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self._wlock.acquire()
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try:
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del self._mapping[key]
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try:
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self._remove(key)
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except ValueError:
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pass
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finally:
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self._wlock.release()
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def items(self):
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"""Return a list of items."""
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result = [(key, self._mapping[key]) for key in list(self._queue)]
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result.reverse()
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return result
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def iteritems(self):
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"""Iterate over all items."""
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warnings.warn(
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"'iteritems()' will be removed in version 3.0. Use"
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" 'iter(cache.items())' instead.",
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DeprecationWarning,
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stacklevel=2,
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)
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return iter(self.items())
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def values(self):
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"""Return a list of all values."""
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return [x[1] for x in self.items()]
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def itervalue(self):
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"""Iterate over all values."""
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warnings.warn(
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"'itervalue()' will be removed in version 3.0. Use"
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" 'iter(cache.values())' instead.",
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DeprecationWarning,
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stacklevel=2,
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)
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return iter(self.values())
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def itervalues(self):
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"""Iterate over all values."""
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warnings.warn(
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"'itervalues()' will be removed in version 3.0. Use"
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" 'iter(cache.values())' instead.",
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DeprecationWarning,
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stacklevel=2,
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)
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return iter(self.values())
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def keys(self):
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"""Return a list of all keys ordered by most recent usage."""
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return list(self)
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def iterkeys(self):
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"""Iterate over all keys in the cache dict, ordered by
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the most recent usage.
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"""
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warnings.warn(
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"'iterkeys()' will be removed in version 3.0. Use"
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" 'iter(cache.keys())' instead.",
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DeprecationWarning,
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stacklevel=2,
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)
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return iter(self)
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def __iter__(self):
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return reversed(tuple(self._queue))
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def __reversed__(self):
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"""Iterate over the keys in the cache dict, oldest items
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coming first.
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"""
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return iter(tuple(self._queue))
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__copy__ = copy
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abc.MutableMapping.register(LRUCache)
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def select_autoescape(
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enabled_extensions=("html", "htm", "xml"),
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disabled_extensions=(),
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default_for_string=True,
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default=False,
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):
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"""Intelligently sets the initial value of autoescaping based on the
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filename of the template. This is the recommended way to configure
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autoescaping if you do not want to write a custom function yourself.
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If you want to enable it for all templates created from strings or
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for all templates with `.html` and `.xml` extensions::
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from jinja2 import Environment, select_autoescape
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env = Environment(autoescape=select_autoescape(
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enabled_extensions=('html', 'xml'),
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default_for_string=True,
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))
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Example configuration to turn it on at all times except if the template
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ends with `.txt`::
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from jinja2 import Environment, select_autoescape
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env = Environment(autoescape=select_autoescape(
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disabled_extensions=('txt',),
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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("." + x.lstrip(".").lower() for x in enabled_extensions)
|
|
disabled_patterns = tuple("." + x.lstrip(".").lower() for x in disabled_extensions)
|
|
|
|
def autoescape(template_name):
|
|
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, dumper=None, **kwargs):
|
|
"""Works exactly like :func:`dumps` but is safe for use in ``<script>``
|
|
tags. It accepts the same arguments and returns a JSON string. Note that
|
|
this is available in templates through the ``|tojson`` filter which will
|
|
also mark the result as safe. Due to how this function escapes certain
|
|
characters this is safe even if used outside of ``<script>`` tags.
|
|
|
|
The following characters are escaped in strings:
|
|
|
|
- ``<``
|
|
- ``>``
|
|
- ``&``
|
|
- ``'``
|
|
|
|
This makes it safe to embed such strings in any place in HTML with the
|
|
notable exception of double quoted attributes. In that case single
|
|
quote your attributes or HTML escape it in addition.
|
|
"""
|
|
if dumper is None:
|
|
dumper = json.dumps
|
|
rv = (
|
|
dumper(obj, **kwargs)
|
|
.replace(u"<", u"\\u003c")
|
|
.replace(u">", u"\\u003e")
|
|
.replace(u"&", u"\\u0026")
|
|
.replace(u"'", u"\\u0027")
|
|
)
|
|
return Markup(rv)
|
|
|
|
|
|
class Cycler(object):
|
|
"""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):
|
|
if not items:
|
|
raise RuntimeError("at least one item has to be provided")
|
|
self.items = items
|
|
self.pos = 0
|
|
|
|
def reset(self):
|
|
"""Resets the current item to the first item."""
|
|
self.pos = 0
|
|
|
|
@property
|
|
def current(self):
|
|
"""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):
|
|
"""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(object):
|
|
"""A joining helper for templates."""
|
|
|
|
def __init__(self, sep=u", "):
|
|
self.sep = sep
|
|
self.used = False
|
|
|
|
def __call__(self):
|
|
if not self.used:
|
|
self.used = True
|
|
return u""
|
|
return self.sep
|
|
|
|
|
|
class Namespace(object):
|
|
"""A namespace object that can hold arbitrary attributes. It may be
|
|
initialized from a dictionary or with keyword arguments."""
|
|
|
|
def __init__(*args, **kwargs): # noqa: B902
|
|
self, args = args[0], args[1:]
|
|
self.__attrs = dict(*args, **kwargs)
|
|
|
|
def __getattribute__(self, name):
|
|
# __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)
|
|
|
|
def __setitem__(self, name, value):
|
|
self.__attrs[name] = value
|
|
|
|
def __repr__(self):
|
|
return "<Namespace %r>" % self.__attrs
|
|
|
|
|
|
# does this python version support async for in and async generators?
|
|
try:
|
|
exec("async def _():\n async for _ in ():\n yield _")
|
|
have_async_gen = True
|
|
except SyntaxError:
|
|
have_async_gen = False
|
|
|
|
|
|
def soft_unicode(s):
|
|
from markupsafe import soft_unicode
|
|
|
|
warnings.warn(
|
|
"'jinja2.utils.soft_unicode' will be removed in version 3.0."
|
|
" Use 'markupsafe.soft_unicode' instead.",
|
|
DeprecationWarning,
|
|
stacklevel=2,
|
|
)
|
|
return soft_unicode(s)
|