author | Waqas Hussain <waqas20@gmail.com> |
Fri, 17 Sep 2010 03:52:11 +0500 | |
changeset 3496 | 9408d1e10e17 |
parent 3392 | 6e31b49c4ab8 |
child 3540 | bc139431830b |
permissions | -rw-r--r-- |
1522
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
1 |
-- Prosody IM |
2923
b7049746bd29
Update copyright headers for 2010
Matthew Wild <mwild1@gmail.com>
parents:
1660
diff
changeset
|
2 |
-- Copyright (C) 2008-2010 Matthew Wild |
b7049746bd29
Update copyright headers for 2010
Matthew Wild <mwild1@gmail.com>
parents:
1660
diff
changeset
|
3 |
-- Copyright (C) 2008-2010 Waqas Hussain |
1522
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
4 |
-- |
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
5 |
-- This project is MIT/X11 licensed. Please see the |
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
6 |
-- COPYING file in the source package for more information. |
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
7 |
-- |
569d58d21612
Add copyright header to those files missing one
Matthew Wild <mwild1@gmail.com>
parents:
919
diff
changeset
|
8 |
|
919
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
9 |
--[[ Iterators ]]-- |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
10 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
11 |
-- Reverse an iterator |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
12 |
function reverse(f, s, var) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
13 |
local results = {}; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
14 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
15 |
-- First call the normal iterator |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
16 |
while true do |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
17 |
local ret = { f(s, var) }; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
18 |
var = ret[1]; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
19 |
if var == nil then break; end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
20 |
table.insert(results, 1, ret); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
21 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
22 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
23 |
-- Then return our reverse one |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
24 |
local i,max = 0, #results; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
25 |
return function (results) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
26 |
if i<max then |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
27 |
i = i + 1; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
28 |
return unpack(results[i]); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
29 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
30 |
end, results; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
31 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
32 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
33 |
-- Iterate only over keys in a table |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
34 |
local function _keys_it(t, key) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
35 |
return (next(t, key)); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
36 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
37 |
function keys(t) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
38 |
return _keys_it, t; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
39 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
40 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
41 |
-- Iterate only over values in a table |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
42 |
function values(t) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
43 |
local key, val; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
44 |
return function (t) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
45 |
key, val = next(t, key); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
46 |
return val; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
47 |
end, t; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
48 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
49 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
50 |
-- Given an iterator, iterate only over unique items |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
51 |
function unique(f, s, var) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
52 |
local set = {}; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
53 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
54 |
return function () |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
55 |
while true do |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
56 |
local ret = { f(s, var) }; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
57 |
var = ret[1]; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
58 |
if var == nil then break; end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
59 |
if not set[var] then |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
60 |
set[var] = true; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
61 |
return var; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
62 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
63 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
64 |
end; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
65 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
66 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
67 |
--[[ Return the number of items an iterator returns ]]-- |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
68 |
function count(f, s, var) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
69 |
local x = 0; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
70 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
71 |
while true do |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
72 |
local ret = { f(s, var) }; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
73 |
var = ret[1]; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
74 |
if var == nil then break; end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
75 |
x = x + 1; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
76 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
77 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
78 |
return x; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
79 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
80 |
|
1659
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
81 |
-- Return the first n items an iterator returns |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
82 |
function head(n, f, s, var) |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
83 |
local c = 0; |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
84 |
return function (s, var) |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
85 |
if c >= n then |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
86 |
return nil; |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
87 |
end |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
88 |
c = c + 1; |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
89 |
return f(s, var); |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
90 |
end, s; |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
91 |
end |
6092fc9b078b
util.iterators: Add head() iterator, to return the first n items
Matthew Wild <mwild1@gmail.com>
parents:
1522
diff
changeset
|
92 |
|
3392
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
93 |
-- Skip the first n items an iterator returns |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
94 |
function skip(n, f, s, var) |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
95 |
for i=1,n do |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
96 |
var = f(s, var); |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
97 |
end |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
98 |
return f, s, var; |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
99 |
end |
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
100 |
|
6e31b49c4ab8
util.iterators: Add skip() to skip the first n items of an iterator
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
101 |
-- Return the last n items an iterator returns |
1660
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
102 |
function tail(n, f, s, var) |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
103 |
local results, count = {}, 0; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
104 |
while true do |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
105 |
local ret = { f(s, var) }; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
106 |
var = ret[1]; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
107 |
if var == nil then break; end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
108 |
results[(count%n)+1] = ret; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
109 |
count = count + 1; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
110 |
end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
111 |
|
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
112 |
if n > count then n = count; end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
113 |
|
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
114 |
local pos = 0; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
115 |
return function () |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
116 |
pos = pos + 1; |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
117 |
if pos > n then return nil; end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
118 |
return unpack(results[((count-1+pos)%n)+1]); |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
119 |
end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
120 |
--return reverse(head(n, reverse(f, s, var))); |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
121 |
end |
ae2f60a20428
util.iterators: Add tail() iterator, to return the last n items
Matthew Wild <mwild1@gmail.com>
parents:
1659
diff
changeset
|
122 |
|
919
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
123 |
-- Convert the values returned by an iterator to an array |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
124 |
function it2array(f, s, var) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
125 |
local t, var = {}; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
126 |
while true do |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
127 |
var = f(s, var); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
128 |
if var == nil then break; end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
129 |
table.insert(t, var); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
130 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
131 |
return t; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
132 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
133 |
|
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
134 |
-- Treat the return of an iterator as key,value pairs, |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
135 |
-- and build a table |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
136 |
function it2table(f, s, var) |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
137 |
local t, var = {}; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
138 |
while true do |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
139 |
var, var2 = f(s, var); |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
140 |
if var == nil then break; end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
141 |
t[var] = var2; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
142 |
end |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
143 |
return t; |
75b8afb79143
util.iterators: New iterators library
Matthew Wild <mwild1@gmail.com>
parents:
diff
changeset
|
144 |
end |