util.filters: Fix inserting items so that higher priority filters run first

[prosody.git] / util / array.lua

diff --git a/util/array.lua b/util/array.lua
index 5dbd3037194db07fe33be563d0765f6d432339cf..2d58e7fb72d623169faa0deeada3dac881154462 100644 (file)
--- a/util/array.lua
+++ b/util/array.lua
@@ -9,12 +9,20 @@
 local t_insert, t_sort, t_remove, t_concat
     = table.insert, table.sort, table.remove, table.concat;
 
+local setmetatable = setmetatable;
+local math_random = math.random;
+local pairs, ipairs = pairs, ipairs;
+local tostring = tostring;
+
 local array = {};
 local array_base = {};
 local array_methods = {};
-local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end };
+local array_mt = { __index = array_methods, __tostring = function (array) return "{"..array:concat(", ").."}"; end };
 
-local function new_array(_, t)
+local function new_array(self, t, _s, _var)
+       if type(t) == "function" then -- Assume iterator
+               t = self.collect(t, _s, _var);
+       end
        return setmetatable(t or {}, array_mt);
 end
 
@@ -25,6 +33,15 @@ end
 
 setmetatable(array, { __call = new_array });
 
+-- Read-only methods
+function array_methods:random()
+       return self[math_random(1,#self)];
+end
+
+-- These methods can be called two ways:
+--   array.method(existing_array, [params [, ...]]) -- Create new array for result
+--   existing_array:method([params, ...]) -- Transform existing array into result
+--
 function array_base.map(outa, ina, func)
        for k,v in ipairs(ina) do
                outa[k] = func(v);
@@ -60,15 +77,18 @@ function array_base.sort(outa, ina, ...)
        return outa;
 end
 
---- These methods only mutate
-function array_methods:random()
-       return self[math.random(1,#self)];
+function array_base.pluck(outa, ina, key)
+       for i=1,#ina do
+               outa[i] = ina[i][key];
+       end
+       return outa;
 end
 
+--- These methods only mutate the array
 function array_methods:shuffle(outa, ina)
        local len = #self;
        for i=1,#self do
-               local r = math.random(i,len);
+               local r = math_random(i,len);
                self[i], self[r] = self[r], self[i];
        end
        return self;
@@ -91,10 +111,24 @@ function array_methods:append(array)
        return self;
 end
 
-array_methods.push = table.insert;
-array_methods.pop = table.remove;
-array_methods.concat = table.concat;
-array_methods.length = function (t) return #t; end
+function array_methods:push(x)
+       t_insert(self, x);
+       return self;
+end
+
+function array_methods:pop(x)
+       local v = self[x];
+       t_remove(self, x);
+       return v;
+end
+
+function array_methods:concat(sep)
+       return t_concat(array.map(self, tostring), sep);
+end
+
+function array_methods:length()
+       return #self;
+end
 
 --- These methods always create a new array
 function array.collect(f, s, var)
@@ -102,7 +136,7 @@ function array.collect(f, s, var)
        while true do
                var = f(s, var);
                if var == nil then break; end
-               table.insert(t, var);
+               t_insert(t, var);
        end
        return setmetatable(t, array_mt);
 end