From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Tue, 4 Nov 2008 20:53:27 +0000 (-0700)
Subject: util: copy in dictutil from pyutil
X-Git-Url: https://git.rkrishnan.org/pf/content/en/seg/biz/?a=commitdiff_plain;h=fb85a6280ff69600d2cf27ecc3c836d86950d4bf;p=tahoe-lafs%2Ftahoe-lafs.git

util: copy in dictutil from pyutil
---

diff --git a/src/allmydata/util/dictutil.py b/src/allmydata/util/dictutil.py
index 45234eea..227d2479 100644
--- a/src/allmydata/util/dictutil.py
+++ b/src/allmydata/util/dictutil.py
@@ -1,3 +1,37 @@
+"""
+Tools to mess with dicts.
+"""
+
+import copy, operator
+from bisect import bisect_left, insort_left
+
+from assertutil import _assert, precondition
+
+def move(k, d1, d2, strict=False):
+    """
+    Move item with key k from d1 to d2.
+    """
+    if strict and not d1.has_key(k):
+        raise KeyError, k
+
+    d2[k] = d1[k]
+    del d1[k]
+
+def subtract(d1, d2):
+    """
+    Remove all items from d1 whose key occurs in d2.
+
+    @returns d1
+    """
+    if len(d1) > len(d2):
+        for k in d2.keys():
+            if d1.has_key(k):
+                del d1[k]
+    else:
+        for k in d1.keys():
+            if d2.has_key(k):
+                del d1[k]
+    return d1
 
 class DictOfSets(dict):
     def add(self, key, value):
@@ -13,3 +47,551 @@ class DictOfSets(dict):
         if not self[key]:
             del self[key]
 
+class UtilDict:
+    def __init__(self, initialdata={}):
+        self.d = {}
+        self.update(initialdata)
+
+    def del_if_present(self, key):
+        if self.has_key(key):
+            del self[key]
+
+    def items_sorted_by_value(self):
+        """
+        @return a sequence of (key, value,) pairs sorted according to value
+        """
+        l = [(x[1], x[0],) for x in self.d.iteritems()]
+        l.sort()
+        return [(x[1], x[0],) for x in l]
+
+    def items_sorted_by_key(self):
+        """
+        @return a sequence of (key, value,) pairs sorted according to key
+        """
+        l = self.d.items()
+        l.sort()
+        return l
+
+    def __repr__(self, *args, **kwargs):
+        return self.d.__repr__(*args, **kwargs)
+
+    def __str__(self, *args, **kwargs):
+        return self.d.__str__(*args, **kwargs)
+
+    def __contains__(self, *args, **kwargs):
+        return self.d.__contains__(*args, **kwargs)
+
+    def __len__(self, *args, **kwargs):
+        return self.d.__len__(*args, **kwargs)
+
+    def __cmp__(self, other):
+        try:
+            return self.d.__cmp__(other)
+        except TypeError, le:
+            # maybe we should look for a .d member in other.  I know this is insanely kludgey, but the Right Way To Do It is for dict.__cmp__ to use structural typing ("duck typing")
+            try:
+                return self.d.__cmp__(other.d)
+            except:
+                raise le
+
+    def __eq__(self, *args, **kwargs):
+        return self.d.__eq__(*args, **kwargs)
+
+    def __ne__(self, *args, **kwargs):
+        return self.d.__ne__(*args, **kwargs)
+
+    def __gt__(self, *args, **kwargs):
+        return self.d.__gt__(*args, **kwargs)
+
+    def __ge__(self, *args, **kwargs):
+        return self.d.__ge__(*args, **kwargs)
+
+    def __le__(self, *args, **kwargs):
+        return self.d.__le__(*args, **kwargs)
+
+    def __lt__(self, *args, **kwargs):
+        return self.d.__lt__(*args, **kwargs)
+
+    def __getitem__(self, *args, **kwargs):
+        return self.d.__getitem__(*args, **kwargs)
+
+    def __setitem__(self, *args, **kwargs):
+        return self.d.__setitem__(*args, **kwargs)
+
+    def __delitem__(self, *args, **kwargs):
+        return self.d.__delitem__(*args, **kwargs)
+
+    def __iter__(self, *args, **kwargs):
+        return self.d.__iter__(*args, **kwargs)
+
+    def clear(self, *args, **kwargs):
+        return self.d.clear(*args, **kwargs)
+
+    def copy(self, *args, **kwargs):
+        return self.__class__(self.d.copy(*args, **kwargs))
+
+    def fromkeys(self, *args, **kwargs):
+        return self.__class__(self.d.fromkeys(*args, **kwargs))
+
+    def get(self, key, default=None):
+        return self.d.get(key, default)
+
+    def has_key(self, *args, **kwargs):
+        return self.d.has_key(*args, **kwargs)
+
+    def items(self, *args, **kwargs):
+        return self.d.items(*args, **kwargs)
+
+    def iteritems(self, *args, **kwargs):
+        return self.d.iteritems(*args, **kwargs)
+
+    def iterkeys(self, *args, **kwargs):
+        return self.d.iterkeys(*args, **kwargs)
+
+    def itervalues(self, *args, **kwargs):
+        return self.d.itervalues(*args, **kwargs)
+
+    def keys(self, *args, **kwargs):
+        return self.d.keys(*args, **kwargs)
+
+    def pop(self, *args, **kwargs):
+        return self.d.pop(*args, **kwargs)
+
+    def popitem(self, *args, **kwargs):
+        return self.d.popitem(*args, **kwargs)
+
+    def setdefault(self, *args, **kwargs):
+        return self.d.setdefault(*args, **kwargs)
+
+    def update(self, *args, **kwargs):
+        self.d.update(*args, **kwargs)
+
+    def values(self, *args, **kwargs):
+        return self.d.values(*args, **kwargs)
+
+class NumDict:
+    def __init__(self, initialdict={}):
+        self.d = copy.deepcopy(initialdict)
+
+    def add_num(self, key, val, default=0):
+        """
+        If the key doesn't appear in self then it is created with value default
+        (before addition).
+        """
+        self.d[key] = self.d.get(key, default) + val
+
+    def subtract_num(self, key, val, default=0):
+        self.d[key] = self.d.get(key, default) - val
+
+    def sum(self):
+        """
+        @return: the sum of all values
+        """
+        return reduce(operator.__add__, self.d.values())
+
+    def inc(self, key, default=0):
+        """
+        Increment the value associated with key in dict.  If there is no such
+        key, then one will be created with initial value 0 (before inc() --
+        therefore value 1 after inc).
+        """
+        self.add_num(key, 1, default)
+
+    def dec(self, key, default=0):
+        """
+        Decrement the value associated with key in dict.  If there is no such
+        key, then one will be created with initial value 0 (before dec() --
+        therefore value -1 after dec).
+        """
+        self.subtract_num(key, 1, default)
+
+    def items_sorted_by_value(self):
+        """
+        @return a sequence of (key, value,) pairs sorted according to value
+        """
+        l = [(x[1], x[0],) for x in self.d.iteritems()]
+        l.sort()
+        return [(x[1], x[0],) for x in l]
+
+    def item_with_largest_value(self):
+        it = self.d.iteritems()
+        (winner, winnerval,) = it.next()
+        try:
+            while True:
+                n, nv = it.next()
+                if nv > winnerval:
+                    winner = n
+                    winnerval = nv
+        except StopIteration:
+            pass
+        return (winner, winnerval,)
+
+    def items_sorted_by_key(self):
+        """
+        @return a sequence of (key, value,) pairs sorted according to key
+        """
+        l = self.d.items()
+        l.sort()
+        return l
+
+    def __repr__(self, *args, **kwargs):
+        return self.d.__repr__(*args, **kwargs)
+
+    def __str__(self, *args, **kwargs):
+        return self.d.__str__(*args, **kwargs)
+
+    def __contains__(self, *args, **kwargs):
+        return self.d.__contains__(*args, **kwargs)
+
+    def __len__(self, *args, **kwargs):
+        return self.d.__len__(*args, **kwargs)
+
+    def __cmp__(self, other):
+        try:
+            return self.d.__cmp__(other)
+        except TypeError, le:
+            # maybe we should look for a .d member in other.  I know this is insanely kludgey, but the Right Way To Do It is for dict.__cmp__ to use structural typing ("duck typing")
+            try:
+                return self.d.__cmp__(other.d)
+            except:
+                raise le
+
+    def __eq__(self, *args, **kwargs):
+        return self.d.__eq__(*args, **kwargs)
+
+    def __ne__(self, *args, **kwargs):
+        return self.d.__ne__(*args, **kwargs)
+
+    def __gt__(self, *args, **kwargs):
+        return self.d.__gt__(*args, **kwargs)
+
+    def __ge__(self, *args, **kwargs):
+        return self.d.__ge__(*args, **kwargs)
+
+    def __le__(self, *args, **kwargs):
+        return self.d.__le__(*args, **kwargs)
+
+    def __lt__(self, *args, **kwargs):
+        return self.d.__lt__(*args, **kwargs)
+
+    def __getitem__(self, *args, **kwargs):
+        return self.d.__getitem__(*args, **kwargs)
+
+    def __setitem__(self, *args, **kwargs):
+        return self.d.__setitem__(*args, **kwargs)
+
+    def __delitem__(self, *args, **kwargs):
+        return self.d.__delitem__(*args, **kwargs)
+
+    def __iter__(self, *args, **kwargs):
+        return self.d.__iter__(*args, **kwargs)
+
+    def clear(self, *args, **kwargs):
+        return self.d.clear(*args, **kwargs)
+
+    def copy(self, *args, **kwargs):
+        return self.__class__(self.d.copy(*args, **kwargs))
+
+    def fromkeys(self, *args, **kwargs):
+        return self.__class__(self.d.fromkeys(*args, **kwargs))
+
+    def get(self, key, default=0):
+        return self.d.get(key, default)
+
+    def has_key(self, *args, **kwargs):
+        return self.d.has_key(*args, **kwargs)
+
+    def items(self, *args, **kwargs):
+        return self.d.items(*args, **kwargs)
+
+    def iteritems(self, *args, **kwargs):
+        return self.d.iteritems(*args, **kwargs)
+
+    def iterkeys(self, *args, **kwargs):
+        return self.d.iterkeys(*args, **kwargs)
+
+    def itervalues(self, *args, **kwargs):
+        return self.d.itervalues(*args, **kwargs)
+
+    def keys(self, *args, **kwargs):
+        return self.d.keys(*args, **kwargs)
+
+    def pop(self, *args, **kwargs):
+        return self.d.pop(*args, **kwargs)
+
+    def popitem(self, *args, **kwargs):
+        return self.d.popitem(*args, **kwargs)
+
+    def setdefault(self, *args, **kwargs):
+        return self.d.setdefault(*args, **kwargs)
+
+    def update(self, *args, **kwargs):
+        return self.d.update(*args, **kwargs)
+
+    def values(self, *args, **kwargs):
+        return self.d.values(*args, **kwargs)
+
+def del_if_present(d, k):
+    if d.has_key(k):
+        del d[k]
+
+class ValueOrderedDict:
+    """
+    Note: this implementation assumes that the values do not mutate and change
+    their sort order.  That is, it stores the values in a sorted list and 
+    as items are added and removed from the dict, it makes updates to the list
+    which will keep the list sorted.  But if a value that is currently sitting
+    in the list changes its sort order, then the internal consistency of this
+    object will be lost.
+
+    If that happens, and if assertion checking is turned on, then you will get
+    an assertion failure the very next time you try to do anything with this
+    ValueOrderedDict.  However, those internal consistency checks are very slow
+    and almost certainly unacceptable to leave turned on in production code.
+    """
+    class ItemIterator:
+        def __init__(self, c):
+            self.c = c
+            self.i = 0
+        def __iter__(self):
+            return self
+        def next(self):
+            precondition(self.i <= len(self.c.l), "The iterated ValueOrderedDict doesn't have this many elements.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, self.c)
+            precondition((self.i == len(self.c.l)) or self.c.d.has_key(self.c.l[self.i][1]), "The iterated ValueOrderedDict doesn't have this key.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, (self.i < len(self.c.l)) and self.c.l[self.i], self.c)
+            if self.i == len(self.c.l):
+                raise StopIteration
+            le = self.c.l[self.i]
+            self.i += 1
+            return (le[1], le[0],)
+
+    def iteritems(self):
+        return ValueOrderedDict.ItemIterator(self)
+
+    def items(self):
+        return zip(map(operator.__getitem__, self.l, [1]*len(self.l)), map(operator.__getitem__, self.l, [0]*len(self.l)))
+
+    def values(self):
+        return map(operator.__getitem__, self.l, [0]*len(self.l))
+
+    def keys(self):
+        return map(operator.__getitem__, self.l, [1]*len(self.l))
+
+    class KeyIterator:
+        def __init__(self, c):
+            self.c = c
+            self.i = 0
+        def __iter__(self):
+            return self
+        def next(self):
+            precondition(self.i <= len(self.c.l), "The iterated ValueOrderedDict doesn't have this many elements.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, self.c)
+            precondition((self.i == len(self.c.l)) or self.c.d.has_key(self.c.l[self.i][1]), "The iterated ValueOrderedDict doesn't have this key.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, (self.i < len(self.c.l)) and self.c.l[self.i], self.c)
+            if self.i == len(self.c.l):
+                raise StopIteration
+            le = self.c.l[self.i]
+            self.i += 1
+            return le[1]
+
+    def iterkeys(self):
+        return ValueOrderedDict.KeyIterator(self)
+
+    class ValueIterator:
+        def __init__(self, c):
+            self.c = c
+            self.i = 0
+        def __iter__(self):
+            return self
+        def next(self):
+            precondition(self.i <= len(self.c.l), "The iterated ValueOrderedDict doesn't have this many elements.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, self.c)
+            precondition((self.i == len(self.c.l)) or self.c.d.has_key(self.c.l[self.i][1]), "The iterated ValueOrderedDict doesn't have this key.  Most likely this is because someone altered the contents of the ValueOrderedDict while the iteration was in progress.", self.i, (self.i < len(self.c.l)) and self.c.l[self.i], self.c)
+            if self.i == len(self.c.l):
+                raise StopIteration
+            le = self.c.l[self.i]
+            self.i += 1
+            return le[0]
+
+    def itervalues(self):
+        return ValueOrderedDict.ValueIterator(self)
+
+    def __init__(self, initialdata={}):
+        self.d = {} # k: key, v: val
+        self.l = [] # sorted list of tuples of (val, key,)
+        self.update(initialdata)
+        assert self._assert_invariants()
+
+    def __len__(self):
+        return len(self.l)
+
+    def __repr_n__(self, n=None):
+        s = ["{",]
+        try:
+            iter = self.iteritems()
+            x = iter.next()
+            s.append(str(x[0])); s.append(": "); s.append(str(x[1]))
+            i = 1
+            while (n is None) or (i < n):
+                x = iter.next()
+                s.append(", "); s.append(str(x[0])); s.append(": "); s.append(str(x[1]))
+        except StopIteration:
+            pass
+        s.append("}")
+        return ''.join(s)
+
+    def __repr__(self):
+        return "<%s %s>" % (self.__class__.__name__, self.__repr_n__(),)
+
+    def __str__(self):
+        return "<%s %s>" % (self.__class__.__name__, self.__repr_n__(16),)
+
+    def __eq__(self, other):
+        for (k, v,) in other.iteritems():
+            if not self.d.has_key(k) or self.d[k] != v:
+                return False
+        return True
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def _assert_invariants(self):
+        iter = self.l.__iter__()
+        try:
+            oldx = iter.next()
+            while True:
+                x = iter.next()
+                # self.l is required to be sorted
+                _assert(x >= oldx, x, oldx)
+                # every element of self.l is required to appear in self.d
+                _assert(self.d.has_key(x[1]), x)
+                oldx =x
+        except StopIteration:
+            pass
+        for (k, v,) in self.d.iteritems():
+            i = bisect_left(self.l, (v, k,))
+            while (self.l[i][0] is not v) or (self.l[i][1] is not k):
+                i += 1
+            _assert(i < len(self.l), i, len(self.l), k, v, self.l)
+            _assert(self.l[i][0] is v, i, v, l=self.l, d=self.d)
+            _assert(self.l[i][1] is k, i, k, l=self.l, d=self.d)
+        return True
+
+    def insert(self, key, val=None):
+        assert self._assert_invariants()
+        result = self.__setitem__(key, val)
+        assert self._assert_invariants()
+        return result
+
+    def setdefault(self, key, default=None):
+        assert self._assert_invariants()
+        if not self.has_key(key):
+            self[key] = default
+        assert self._assert_invariants()
+        return self[key]
+
+    def __setitem__(self, key, val=None):
+        assert self._assert_invariants()
+        if self.d.has_key(key):
+            oldval = self.d[key]
+            if oldval != val:
+                # re-sort
+                i = bisect_left(self.l, (oldval, key,))
+                while (self.l[i][0] is not oldval) or (self.l[i][1] is not key):
+                    i += 1
+                self.l.pop(i)
+                insort_left(self.l, (val, key,))
+            elif oldval is not val:
+                # replace
+                i = bisect_left(self.l, (oldval, key,))
+                while (self.l[i][0] is not oldval) or (self.l[i][1] is not key):
+                    i += 1
+                self.l[i] = (val, key,)
+        else:
+            insort_left(self.l, (val, key,))
+
+        self.d[key] = val
+        assert self._assert_invariants()
+        return val
+
+    def remove(self, key, default=None, strictkey=True):
+        assert self._assert_invariants()
+        result = self.__delitem__(key, default, strictkey)
+        assert self._assert_invariants()
+        return result
+
+    def __getitem__(self, key, default=None, strictkey=True):
+        if not self.d.has_key(key):
+            if strictkey:
+                raise KeyError, key
+            else:
+                return default
+        return self.d[key]
+
+    def __delitem__(self, key, default=None, strictkey=True):
+        """
+        @param strictkey: True if you want a KeyError in the case that
+            key is not there, False if you want a reference to default
+            in the case that key is not there
+        @param default: the object to return if key is not there; This
+            is ignored if strictkey.
+
+        @return: the object removed or default if there is not item by
+            that key and strictkey is False
+        """
+        assert self._assert_invariants()
+        if self.d.has_key(key):
+            val = self.d.pop(key)
+            i = bisect_left(self.l, (val, key,))
+            while (self.l[i][0] is not val) or (self.l[i][1] is not key):
+                i += 1
+            self.l.pop(i)
+            assert self._assert_invariants()
+            return val
+        elif strictkey:
+            assert self._assert_invariants()
+            raise KeyError, key
+        else:
+            assert self._assert_invariants()
+            return default
+
+    def clear(self):
+        assert self._assert_invariants()
+        self.d.clear()
+        del self.l[:]
+        assert self._assert_invariants()
+
+    def update(self, otherdict):
+        """
+        @return: self
+        """
+        assert self._assert_invariants()
+        for (k, v,) in otherdict.iteritems():
+            self.insert(k, v)
+        assert self._assert_invariants()
+        return self
+
+    def has_key(self, key):
+        assert self._assert_invariants()
+        return self.d.has_key(key)
+
+    def popitem(self):
+        if not self.l:
+            raise KeyError, 'popitem(): dictionary is empty'
+        le = self.l.pop(0)
+        del self.d[le[1]]
+        return (le[1], le[0],)
+
+    def pop(self, k, default=None, strictkey=False):
+        if not self.d.has_key(k):
+            if strictkey:
+                raise KeyError, k
+            else:
+                return default
+        v = self.d.pop(k)
+        i = bisect_left(self.l, (v, k,))
+        while (self.l[i][0] is not v) or (self.l[i][1] is not k):
+            i += 1
+        self.l.pop(i)
+        return v
+
+    def pop_from_list(self, i=0):
+        le = self.l.pop(i)
+        del self.d[le[1]]
+        return le[1]