reorganize couch .erl and driver code into rebar layout

1 files changed, 329 insertions, 0 deletions

diff --git a/apps/couch/src/couch_key_tree.erl b/apps/couch/src/couch_key_tree.erl
new file mode 100644
index 00000000..4fe09bf3
--- /dev/null
+++ b/apps/couch/src/couch_key_tree.erl
@@ -0,0 +1,329 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_key_tree).
+
+-export([merge/2, find_missing/2, get_key_leafs/2, get_full_key_paths/2, get/2]).
+-export([map/2, get_all_leafs/1, count_leafs/1, remove_leafs/2,
+    get_all_leafs_full/1,stem/2,map_leafs/2]).
+
+% a key tree looks like this:
+% Tree -> [] or [{Key, Value, ChildTree} | SiblingTree]
+% ChildTree -> Tree
+% SiblingTree -> [] or [{SiblingKey, Value, Tree} | Tree]
+% And each Key < SiblingKey
+
+
+% partial trees arranged by how much they are cut off.
+
+merge(A, B) ->
+    {Merged, HasConflicts} =
+    lists:foldl(
+        fun(InsertTree, {AccTrees, AccConflicts}) ->
+            {ok, Merged, Conflicts} = merge_one(AccTrees, InsertTree, [], false),
+            {Merged, Conflicts or AccConflicts}
+        end,
+        {A, false}, B),
+    if HasConflicts or
+            ((length(Merged) =/= length(A)) and (length(Merged) =/= length(B))) ->
+        Conflicts = conflicts;
+    true ->
+        Conflicts = no_conflicts
+    end,
+    {lists:sort(Merged), Conflicts}.
+
+merge_one([], Insert, OutAcc, ConflictsAcc) ->
+    {ok, [Insert | OutAcc], ConflictsAcc};
+merge_one([{Start, Tree}|Rest], {StartInsert, TreeInsert}, OutAcc, ConflictsAcc) ->
+    if Start =< StartInsert ->
+        StartA = Start,
+        StartB = StartInsert,
+        TreeA = Tree,
+        TreeB = TreeInsert;
+    true ->
+        StartB = Start,
+        StartA = StartInsert,
+        TreeB = Tree,
+        TreeA = TreeInsert
+    end,
+    case merge_at([TreeA], StartB - StartA, TreeB) of
+    {ok, [CombinedTrees], Conflicts} ->
+        merge_one(Rest, {StartA, CombinedTrees}, OutAcc, Conflicts or ConflictsAcc);
+    no ->
+        merge_one(Rest, {StartB, TreeB}, [{StartA, TreeA} | OutAcc], ConflictsAcc)
+    end.
+
+merge_at([], _Place, _Insert) ->
+    no;
+merge_at([{Key, Value, SubTree}|Sibs], 0, {InsertKey, InsertValue, InsertSubTree}) ->
+    if Key == InsertKey ->
+        {Merge, Conflicts} = merge_simple(SubTree, InsertSubTree),
+        {ok, [{Key, Value, Merge} | Sibs], Conflicts};
+    true ->
+        case merge_at(Sibs, 0, {InsertKey, InsertValue, InsertSubTree}) of
+        {ok, Merged, Conflicts} ->
+            {ok, [{Key, Value, SubTree} | Merged], Conflicts};
+        no ->
+            no
+        end
+    end;
+merge_at([{Key, Value, SubTree}|Sibs], Place, Insert) ->
+    case merge_at(SubTree, Place - 1,Insert) of
+    {ok, Merged, Conflicts} ->
+        {ok, [{Key, Value, Merged} | Sibs], Conflicts};
+    no ->
+        case merge_at(Sibs, Place, Insert) of
+        {ok, Merged, Conflicts} ->
+            {ok, [{Key, Value, SubTree} | Merged], Conflicts};
+        no ->
+            no
+        end
+    end.
+
+% key tree functions
+merge_simple([], B) ->
+    {B, false};
+merge_simple(A, []) ->
+    {A, false};
+merge_simple([ATree | ANextTree], [BTree | BNextTree]) ->
+    {AKey, AValue, ASubTree} = ATree,
+    {BKey, _BValue, BSubTree} = BTree,
+    if
+    AKey == BKey ->
+        %same key
+        {MergedSubTree, Conflict1} = merge_simple(ASubTree, BSubTree),
+        {MergedNextTree, Conflict2} = merge_simple(ANextTree, BNextTree),
+        {[{AKey, AValue, MergedSubTree} | MergedNextTree], Conflict1 or Conflict2};
+    AKey < BKey ->
+        {MTree, _} = merge_simple(ANextTree, [BTree | BNextTree]),
+        {[ATree | MTree], true};
+    true ->
+        {MTree, _} = merge_simple([ATree | ANextTree], BNextTree),
+        {[BTree | MTree], true}
+    end.
+
+find_missing(_Tree, []) ->
+    [];
+find_missing([], SeachKeys) ->
+    SeachKeys;
+find_missing([{Start, {Key, Value, SubTree}} | RestTree], SeachKeys) ->
+    PossibleKeys = [{KeyPos, KeyValue} || {KeyPos, KeyValue} <- SeachKeys, KeyPos >= Start],
+    ImpossibleKeys = [{KeyPos, KeyValue} || {KeyPos, KeyValue} <- SeachKeys, KeyPos < Start],
+    Missing = find_missing_simple(Start, [{Key, Value, SubTree}], PossibleKeys),
+    find_missing(RestTree, ImpossibleKeys ++ Missing).
+
+find_missing_simple(_Pos, _Tree, []) ->
+    [];
+find_missing_simple(_Pos, [], SeachKeys) ->
+    SeachKeys;
+find_missing_simple(Pos, [{Key, _, SubTree} | RestTree], SeachKeys) ->
+    PossibleKeys = [{KeyPos, KeyValue} || {KeyPos, KeyValue} <- SeachKeys, KeyPos >= Pos],
+    ImpossibleKeys = [{KeyPos, KeyValue} || {KeyPos, KeyValue} <- SeachKeys, KeyPos < Pos],
+
+    SrcKeys2 = PossibleKeys -- [{Pos, Key}],
+    SrcKeys3 = find_missing_simple(Pos + 1, SubTree, SrcKeys2),
+    ImpossibleKeys ++ find_missing_simple(Pos, RestTree, SrcKeys3).
+
+
+filter_leafs([], _Keys, FilteredAcc, RemovedKeysAcc) ->
+    {FilteredAcc, RemovedKeysAcc};
+filter_leafs([{Pos, [{LeafKey, _}|_]} = Path |Rest], Keys, FilteredAcc, RemovedKeysAcc) ->
+    FilteredKeys = lists:delete({Pos, LeafKey}, Keys),
+    if FilteredKeys == Keys ->
+        % this leaf is not a key we are looking to remove
+        filter_leafs(Rest, Keys, [Path | FilteredAcc], RemovedKeysAcc);
+    true ->
+        % this did match a key, remove both the node and the input key
+        filter_leafs(Rest, FilteredKeys, FilteredAcc, [{Pos, LeafKey} | RemovedKeysAcc])
+    end.
+
+% Removes any branches from the tree whose leaf node(s) are in the Keys
+remove_leafs(Trees, Keys) ->
+    % flatten each branch in a tree into a tree path
+    Paths = get_all_leafs_full(Trees),
+
+    % filter out any that are in the keys list.
+    {FilteredPaths, RemovedKeys} = filter_leafs(Paths, Keys, [], []),
+
+    % convert paths back to trees
+    NewTree = lists:foldl(
+        fun({PathPos, Path},TreeAcc) ->
+            [SingleTree] = lists:foldl(
+                fun({K,V},NewTreeAcc) -> [{K,V,NewTreeAcc}] end, [], Path),
+            {NewTrees, _} = merge(TreeAcc, [{PathPos + 1 - length(Path), SingleTree}]),
+            NewTrees
+        end, [], FilteredPaths),
+    {NewTree, RemovedKeys}.
+
+
+% get the leafs in the tree matching the keys. The matching key nodes can be
+% leafs or an inner nodes. If an inner node, then the leafs for that node
+% are returned.
+get_key_leafs(Tree, Keys) ->
+    get_key_leafs(Tree, Keys, []).
+
+get_key_leafs(_, [], Acc) ->
+    {Acc, []};
+get_key_leafs([], Keys, Acc) ->
+    {Acc, Keys};
+get_key_leafs([{Pos, Tree}|Rest], Keys, Acc) ->
+    {Gotten, RemainingKeys} = get_key_leafs_simple(Pos, [Tree], Keys, []),
+    get_key_leafs(Rest, RemainingKeys, Gotten ++ Acc).
+
+get_key_leafs_simple(_Pos, _Tree, [], _KeyPathAcc) ->
+    {[], []};
+get_key_leafs_simple(_Pos, [], KeysToGet, _KeyPathAcc) ->
+    {[], KeysToGet};
+get_key_leafs_simple(Pos, [{Key, _Value, SubTree}=Tree | RestTree], KeysToGet, KeyPathAcc) ->
+    case lists:delete({Pos, Key}, KeysToGet) of
+    KeysToGet -> % same list, key not found
+        {LeafsFound, KeysToGet2} = get_key_leafs_simple(Pos + 1, SubTree, KeysToGet, [Key | KeyPathAcc]),
+        {RestLeafsFound, KeysRemaining} = get_key_leafs_simple(Pos, RestTree, KeysToGet2, KeyPathAcc),
+        {LeafsFound ++ RestLeafsFound, KeysRemaining};
+    KeysToGet2 ->
+        LeafsFound = get_all_leafs_simple(Pos, [Tree], KeyPathAcc),
+        LeafKeysFound = [LeafKeyFound || {LeafKeyFound, _} <- LeafsFound],
+        KeysToGet2 = KeysToGet2 -- LeafKeysFound,
+        {RestLeafsFound, KeysRemaining} = get_key_leafs_simple(Pos, RestTree, KeysToGet2, KeyPathAcc),
+        {LeafsFound ++ RestLeafsFound, KeysRemaining}
+    end.
+
+get(Tree, KeysToGet) ->
+    {KeyPaths, KeysNotFound} = get_full_key_paths(Tree, KeysToGet),
+    FixedResults = [ {Value, {Pos, [Key0 || {Key0, _} <- Path]}} || {Pos, [{_Key, Value}|_]=Path} <- KeyPaths],
+    {FixedResults, KeysNotFound}.
+
+get_full_key_paths(Tree, Keys) ->
+    get_full_key_paths(Tree, Keys, []).
+
+get_full_key_paths(_, [], Acc) ->
+    {Acc, []};
+get_full_key_paths([], Keys, Acc) ->
+    {Acc, Keys};
+get_full_key_paths([{Pos, Tree}|Rest], Keys, Acc) ->
+    {Gotten, RemainingKeys} = get_full_key_paths(Pos, [Tree], Keys, []),
+    get_full_key_paths(Rest, RemainingKeys, Gotten ++ Acc).
+
+
+get_full_key_paths(_Pos, _Tree, [], _KeyPathAcc) ->
+    {[], []};
+get_full_key_paths(_Pos, [], KeysToGet, _KeyPathAcc) ->
+    {[], KeysToGet};
+get_full_key_paths(Pos, [{KeyId, Value, SubTree} | RestTree], KeysToGet, KeyPathAcc) ->
+    KeysToGet2 = KeysToGet -- [{Pos, KeyId}],
+    CurrentNodeResult =
+    case length(KeysToGet2) =:= length(KeysToGet) of
+    true -> % not in the key list.
+        [];
+    false -> % this node is the key list. return it
+        [{Pos, [{KeyId, Value} | KeyPathAcc]}]
+    end,
+    {KeysGotten, KeysRemaining} = get_full_key_paths(Pos + 1, SubTree, KeysToGet2, [{KeyId, Value} | KeyPathAcc]),
+    {KeysGotten2, KeysRemaining2} = get_full_key_paths(Pos, RestTree, KeysRemaining, KeyPathAcc),
+    {CurrentNodeResult ++ KeysGotten ++ KeysGotten2, KeysRemaining2}.
+
+get_all_leafs_full(Tree) ->
+    get_all_leafs_full(Tree, []).
+
+get_all_leafs_full([], Acc) ->
+    Acc;
+get_all_leafs_full([{Pos, Tree} | Rest], Acc) ->
+    get_all_leafs_full(Rest, get_all_leafs_full_simple(Pos, [Tree], []) ++ Acc).
+
+get_all_leafs_full_simple(_Pos, [], _KeyPathAcc) ->
+    [];
+get_all_leafs_full_simple(Pos, [{KeyId, Value, []} | RestTree], KeyPathAcc) ->
+    [{Pos, [{KeyId, Value} | KeyPathAcc]} | get_all_leafs_full_simple(Pos, RestTree, KeyPathAcc)];
+get_all_leafs_full_simple(Pos, [{KeyId, Value, SubTree} | RestTree], KeyPathAcc) ->
+    get_all_leafs_full_simple(Pos + 1, SubTree, [{KeyId, Value} | KeyPathAcc]) ++ get_all_leafs_full_simple(Pos, RestTree, KeyPathAcc).
+
+get_all_leafs(Trees) ->
+    get_all_leafs(Trees, []).
+
+get_all_leafs([], Acc) ->
+    Acc;
+get_all_leafs([{Pos, Tree}|Rest], Acc) ->
+    get_all_leafs(Rest, get_all_leafs_simple(Pos, [Tree], []) ++ Acc).
+
+get_all_leafs_simple(_Pos, [], _KeyPathAcc) ->
+    [];
+get_all_leafs_simple(Pos, [{KeyId, Value, []} | RestTree], KeyPathAcc) ->
+    [{Value, {Pos, [KeyId | KeyPathAcc]}} | get_all_leafs_simple(Pos, RestTree, KeyPathAcc)];
+get_all_leafs_simple(Pos, [{KeyId, _Value, SubTree} | RestTree], KeyPathAcc) ->
+    get_all_leafs_simple(Pos + 1, SubTree, [KeyId | KeyPathAcc]) ++ get_all_leafs_simple(Pos, RestTree, KeyPathAcc).
+
+
+count_leafs([]) ->
+    0;
+count_leafs([{_Pos,Tree}|Rest]) ->
+    count_leafs_simple([Tree]) + count_leafs(Rest).
+
+count_leafs_simple([]) ->
+    0;
+count_leafs_simple([{_Key, _Value, []} | RestTree]) ->
+    1 + count_leafs_simple(RestTree);
+count_leafs_simple([{_Key, _Value, SubTree} | RestTree]) ->
+    count_leafs_simple(SubTree) + count_leafs_simple(RestTree).
+
+
+map(_Fun, []) ->
+    [];
+map(Fun, [{Pos, Tree}|Rest]) ->
+    case erlang:fun_info(Fun, arity) of
+    {arity, 2} ->
+        [NewTree] = map_simple(fun(A,B,_C) -> Fun(A,B) end, Pos, [Tree]),
+        [{Pos, NewTree} | map(Fun, Rest)];
+    {arity, 3} ->
+        [NewTree] = map_simple(Fun, Pos, [Tree]),
+        [{Pos, NewTree} | map(Fun, Rest)]
+    end.
+
+map_simple(_Fun, _Pos, []) ->
+    [];
+map_simple(Fun, Pos, [{Key, Value, SubTree} | RestTree]) ->
+    Value2 = Fun({Pos, Key}, Value,
+            if SubTree == [] -> leaf; true -> branch end),
+    [{Key, Value2, map_simple(Fun, Pos + 1, SubTree)} | map_simple(Fun, Pos, RestTree)].
+
+
+map_leafs(_Fun, []) ->
+    [];
+map_leafs(Fun, [{Pos, Tree}|Rest]) ->
+    [NewTree] = map_leafs_simple(Fun, Pos, [Tree]),
+    [{Pos, NewTree} | map_leafs(Fun, Rest)].
+
+map_leafs_simple(_Fun, _Pos, []) ->
+    [];
+map_leafs_simple(Fun, Pos, [{Key, Value, []} | RestTree]) ->
+    Value2 = Fun({Pos, Key}, Value),
+    [{Key, Value2, []} | map_leafs_simple(Fun, Pos, RestTree)];
+map_leafs_simple(Fun, Pos, [{Key, Value, SubTree} | RestTree]) ->
+    [{Key, Value, map_leafs_simple(Fun, Pos + 1, SubTree)} | map_leafs_simple(Fun, Pos, RestTree)].
+
+
+stem(Trees, Limit) ->
+    % flatten each branch in a tree into a tree path
+    Paths = get_all_leafs_full(Trees),
+
+    Paths2 = [{Pos, lists:sublist(Path, Limit)} || {Pos, Path} <- Paths],
+
+    % convert paths back to trees
+    lists:foldl(
+        fun({PathPos, Path},TreeAcc) ->
+            [SingleTree] = lists:foldl(
+                fun({K,V},NewTreeAcc) -> [{K,V,NewTreeAcc}] end, [], Path),
+            {NewTrees, _} = merge(TreeAcc, [{PathPos + 1 - length(Path), SingleTree}]),
+            NewTrees
+        end, [], Paths2).
+
+% Tests moved to test/etap/06?-*.t
+