add code for analysis of data

1 files changed, 175 insertions, 0 deletions

diff --git a/venv/lib/python3.8/site-packages/werkzeug/datastructures/cache_control.py b/venv/lib/python3.8/site-packages/werkzeug/datastructures/cache_control.py
new file mode 100644
index 0000000..bff4c18
--- /dev/null
+++ b/venv/lib/python3.8/site-packages/werkzeug/datastructures/cache_control.py
@@ -0,0 +1,175 @@
+from __future__ import annotations
+
+from .mixins import ImmutableDictMixin
+from .mixins import UpdateDictMixin
+
+
+def cache_control_property(key, empty, type):
+    """Return a new property object for a cache header. Useful if you
+    want to add support for a cache extension in a subclass.
+
+    .. versionchanged:: 2.0
+        Renamed from ``cache_property``.
+    """
+    return property(
+        lambda x: x._get_cache_value(key, empty, type),
+        lambda x, v: x._set_cache_value(key, v, type),
+        lambda x: x._del_cache_value(key),
+        f"accessor for {key!r}",
+    )
+
+
+class _CacheControl(UpdateDictMixin, dict):
+    """Subclass of a dict that stores values for a Cache-Control header.  It
+    has accessors for all the cache-control directives specified in RFC 2616.
+    The class does not differentiate between request and response directives.
+
+    Because the cache-control directives in the HTTP header use dashes the
+    python descriptors use underscores for that.
+
+    To get a header of the :class:`CacheControl` object again you can convert
+    the object into a string or call the :meth:`to_header` method.  If you plan
+    to subclass it and add your own items have a look at the sourcecode for
+    that class.
+
+    .. versionchanged:: 2.1.0
+        Setting int properties such as ``max_age`` will convert the
+        value to an int.
+
+    .. versionchanged:: 0.4
+
+       Setting `no_cache` or `private` to boolean `True` will set the implicit
+       none-value which is ``*``:
+
+       >>> cc = ResponseCacheControl()
+       >>> cc.no_cache = True
+       >>> cc
+       <ResponseCacheControl 'no-cache'>
+       >>> cc.no_cache
+       '*'
+       >>> cc.no_cache = None
+       >>> cc
+       <ResponseCacheControl ''>
+
+       In versions before 0.5 the behavior documented here affected the now
+       no longer existing `CacheControl` class.
+    """
+
+    no_cache = cache_control_property("no-cache", "*", None)
+    no_store = cache_control_property("no-store", None, bool)
+    max_age = cache_control_property("max-age", -1, int)
+    no_transform = cache_control_property("no-transform", None, None)
+
+    def __init__(self, values=(), on_update=None):
+        dict.__init__(self, values or ())
+        self.on_update = on_update
+        self.provided = values is not None
+
+    def _get_cache_value(self, key, empty, type):
+        """Used internally by the accessor properties."""
+        if type is bool:
+            return key in self
+        if key in self:
+            value = self[key]
+            if value is None:
+                return empty
+            elif type is not None:
+                try:
+                    value = type(value)
+                except ValueError:
+                    pass
+            return value
+        return None
+
+    def _set_cache_value(self, key, value, type):
+        """Used internally by the accessor properties."""
+        if type is bool:
+            if value:
+                self[key] = None
+            else:
+                self.pop(key, None)
+        else:
+            if value is None:
+                self.pop(key, None)
+            elif value is True:
+                self[key] = None
+            else:
+                if type is not None:
+                    self[key] = type(value)
+                else:
+                    self[key] = value
+
+    def _del_cache_value(self, key):
+        """Used internally by the accessor properties."""
+        if key in self:
+            del self[key]
+
+    def to_header(self):
+        """Convert the stored values into a cache control header."""
+        return http.dump_header(self)
+
+    def __str__(self):
+        return self.to_header()
+
+    def __repr__(self):
+        kv_str = " ".join(f"{k}={v!r}" for k, v in sorted(self.items()))
+        return f"<{type(self).__name__} {kv_str}>"
+
+    cache_property = staticmethod(cache_control_property)
+
+
+class RequestCacheControl(ImmutableDictMixin, _CacheControl):
+    """A cache control for requests.  This is immutable and gives access
+    to all the request-relevant cache control headers.
+
+    To get a header of the :class:`RequestCacheControl` object again you can
+    convert the object into a string or call the :meth:`to_header` method.  If
+    you plan to subclass it and add your own items have a look at the sourcecode
+    for that class.
+
+    .. versionchanged:: 2.1.0
+        Setting int properties such as ``max_age`` will convert the
+        value to an int.
+
+    .. versionadded:: 0.5
+       In previous versions a `CacheControl` class existed that was used
+       both for request and response.
+    """
+
+    max_stale = cache_control_property("max-stale", "*", int)
+    min_fresh = cache_control_property("min-fresh", "*", int)
+    only_if_cached = cache_control_property("only-if-cached", None, bool)
+
+
+class ResponseCacheControl(_CacheControl):
+    """A cache control for responses.  Unlike :class:`RequestCacheControl`
+    this is mutable and gives access to response-relevant cache control
+    headers.
+
+    To get a header of the :class:`ResponseCacheControl` object again you can
+    convert the object into a string or call the :meth:`to_header` method.  If
+    you plan to subclass it and add your own items have a look at the sourcecode
+    for that class.
+
+    .. versionchanged:: 2.1.1
+        ``s_maxage`` converts the value to an int.
+
+    .. versionchanged:: 2.1.0
+        Setting int properties such as ``max_age`` will convert the
+        value to an int.
+
+    .. versionadded:: 0.5
+       In previous versions a `CacheControl` class existed that was used
+       both for request and response.
+    """
+
+    public = cache_control_property("public", None, bool)
+    private = cache_control_property("private", "*", None)
+    must_revalidate = cache_control_property("must-revalidate", None, bool)
+    proxy_revalidate = cache_control_property("proxy-revalidate", None, bool)
+    s_maxage = cache_control_property("s-maxage", None, int)
+    immutable = cache_control_property("immutable", None, bool)
+
+
+# circular dependencies
+from .. import http