luci-0.9: merge r5861-r5863
[project/luci.git] / libs / uvl / luasrc / uvl.lua
index f715a02..d2ea4bd 100644 (file)
@@ -8,7 +8,7 @@ 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
+               http://www.apache.org/licenses/LICENSE-2.0
 
 $Id$
 
@@ -19,22 +19,33 @@ $Id$
 -- @class      module
 -- @cstyle     instance
 
-module( "luci.uvl", package.seeall )
+local fs = require "nixio.fs"
+local uci = require "luci.model.uci"
+local util = require "luci.util"
+local nutil = require "nixio.util"
+local table = require "table"
+local string = require "string"
 
-require("luci.fs")
-require("luci.util")
-require("luci.model.uci")
-require("luci.uvl.errors")
-require("luci.uvl.datatypes")
-require("luci.uvl.validation")
-require("luci.uvl.dependencies")
+local require, pcall, ipairs, pairs = require, pcall, ipairs, pairs
+local type, error, tonumber, tostring = type, error, tonumber, tostring
+local unpack, loadfile, collectgarbage = unpack, loadfile, collectgarbage
 
+module "luci.uvl"
 
-TYPE_SCHEME   = 0x00
-TYPE_CONFIG   = 0x01
-TYPE_SECTION  = 0x02
-TYPE_OPTION   = 0x03
-TYPE_ENUM     = 0x04
+local ERR = require "luci.uvl.errors".error
+local datatypes = require "luci.uvl.datatypes"
+local validation = require "luci.uvl.validation"
+local dependencies = require "luci.uvl.dependencies"
+
+local TYPE_SCHEME   = 0x00
+local TYPE_CONFIG   = 0x01
+local TYPE_SECTION  = 0x02
+local TYPE_OPTION   = 0x03
+local TYPE_ENUM     = 0x04
+
+local PAT_EXPR1                = "^%$?[%w_]+$"
+local PAT_EXPR2                = "^%$?[%w_]+%.%$?[%w_]+$"
+local PAT_EXPR3                = "^%$?[%w_]+%.%$?[%w_]+%.%$?[%w_]+$"
 
 --- Boolean; default true;
 -- treat sections found in config but not in scheme as error
@@ -55,25 +66,26 @@ STRICT_LIST_TYPE           = true
 
 local default_schemedir = "/lib/uci/schema"
 local default_savedir = "/tmp/.uvl"
-local ERR = luci.uvl.errors
 
 
 --- Object constructor
 -- @class                      function
 -- @name                       UVL
 -- @param schemedir    Path to the scheme directory (optional)
+-- @param configdir    Override config directory (optional)
 -- @return                     Instance object
-UVL = luci.util.class()
+UVL = util.class()
 
-function UVL.__init__( self, schemedir )
+function UVL.__init__( self, schemedir, configdir )
        self.schemedir  = schemedir or default_schemedir
+       self.configdir  = configdir
        self.packages   = { }
        self.beenthere  = { }
        self.depseen    = { }
-       self.uci                = luci.model.uci
-       self.err                = luci.uvl.errors
-       self.dep                = luci.uvl.dependencies
-       self.datatypes  = luci.uvl.datatypes
+       self.uci                = uci
+       self.err                = ERR
+       self.dep                = dependencies
+       self.datatypes  = datatypes
 end
 
 
@@ -108,19 +120,19 @@ function UVL.validate( self, config, section, option )
 end
 
 --- Validate given configuration.
--- @param config       Name of the configuration to validate
+-- @param cfg  Name of the configuration to validate
 -- @return                     Boolean indicating whether the given config validates
 -- @return                     String containing the reason for errors (if any)
-function UVL.validate_config( self, config, uci )
+function UVL.validate_config( self, cfg, uci )
 
-       if not self.packages[config] then
-               local ok, err = self:read_scheme(config)
+       if not self.packages[cfg] then
+               local ok, err = self:read_scheme(cfg)
                if not ok then
                        return false, err
                end
        end
 
-       local co = luci.uvl.config( self, uci or config, uci and config )
+       local co = config( self, uci or cfg, uci and cfg )
        local sc = { }
 
        self.beenthere = { }
@@ -140,7 +152,7 @@ function UVL.validate_config( self, config, uci )
                end
        end
 
-       for k, v in pairs( self.packages[config].sections ) do
+       for k, v in pairs( self.packages[cfg].sections ) do
                sc[k] = 0
                _uci_foreach( k,
                        function(s)
@@ -153,17 +165,17 @@ function UVL.validate_config( self, config, uci )
                for k, v in pairs(co:config()) do
                        local so = co:section(k)
                        if not self.beenthere[so:cid()] then
-                               co:error(ERR.SECT_UNKNOWN(so))
+                               co:error(ERR('SECT_UNKNOWN', so))
                        end
                end
        end
 
-       for _, k in ipairs(luci.util.keys(sc)) do
+       for _, k in ipairs(util.keys(sc)) do
                local so = co:section(k)
                if so:scheme('required') and sc[k] == 0 then
-                       co:error(ERR.SECT_REQUIRED(so))
+                       co:error(ERR('SECT_REQUIRED', so))
                elseif so:scheme('unique') and sc[k] > 1 then
-                       co:error(ERR.SECT_UNIQUE(so))
+                       co:error(ERR('SECT_UNIQUE', so))
                end
        end
 
@@ -175,16 +187,16 @@ end
 -- @param section      Name of the section to validate
 -- @return                     Boolean indicating whether the given config validates
 -- @return                     String containing the reason for errors (if any)
-function UVL.validate_section( self, config, section, uci )
+function UVL.validate_section( self, cfg, section, uci )
 
-       if not self.packages[config] then
-               local ok, err = self:read_scheme( config )
+       if not self.packages[cfg] then
+               local ok, err = self:read_scheme( cfg )
                if not ok then
                        return false, err
                end
        end
 
-       local co = luci.uvl.config( self, uci or config, uci and config )
+       local co = config( self, uci or cfg, uci and cfg )
        local so = co:section( section )
 
        self.beenthere = { }
@@ -197,7 +209,7 @@ function UVL.validate_section( self, config, section, uci )
        if so:config() then
                return self:_validate_section( so )
        else
-               return false, ERR.SECT_NOTFOUND(so)
+               return false, ERR('SECT_NOTFOUND', so)
        end
 end
 
@@ -207,16 +219,16 @@ end
 -- @param option       Name of the option to validate
 -- @return                     Boolean indicating whether the given config validates
 -- @return                     String containing the reason for errors (if any)
-function UVL.validate_option( self, config, section, option, uci )
+function UVL.validate_option( self, cfg, section, option, uci )
 
-       if not self.packages[config] then
-               local ok, err = self:read_scheme( config )
+       if not self.packages[cfg] then
+               local ok, err = self:read_scheme( cfg )
                if not ok then
                        return false, err
                end
        end
 
-       local co = luci.uvl.config( self, uci or config, uci and config )
+       local co = config( self, uci or cfg, uci and cfg )
        local so = co:section( section )
        local oo = so:option( option )
 
@@ -227,7 +239,7 @@ function UVL.validate_option( self, config, section, option, uci )
        if so:config() and oo:config() then
                return self:_validate_option( oo )
        else
-               return false, ERR.OPT_NOTFOUND(oo)
+               return false, ERR('OPT_NOTFOUND', oo)
        end
 end
 
@@ -240,34 +252,34 @@ function UVL._validate_section( self, section )
                if section:scheme('named') == true and
                   section:config('.anonymous') == true
                then
-                       return false, ERR.SECT_NAMED(section)
+                       return false, ERR('SECT_NAMED', section)
                end
 
                for _, v in ipairs(section:variables()) do
                        local ok, err = self:_validate_option( v )
                        if not ok and (
                                v:scheme('required') or v:scheme('type') == "enum" or (
-                                       not err:is(ERR.ERR_DEP_NOTEQUAL) and
-                                       not err:is(ERR.ERR_DEP_NOVALUE)
+                                       not err:is('DEP_NOTEQUAL') and
+                                       not err:is('DEP_NOVALUE')
                                )
                        ) then
                                section:error(err)
                        end
                end
 
-               local ok, err = luci.uvl.dependencies.check( self, section )
+               local ok, err = dependencies.check( self, section )
                if not ok then
                        section:error(err)
                end
        else
-               return false, ERR.SECT_NOTFOUND(section)
+               return false, ERR('SECT_NOTFOUND', section)
        end
 
        if STRICT_UNKNOWN_OPTIONS and not section:scheme('dynamic') then
                for k, v in pairs(section:config()) do
                        local oo = section:option(k)
-                       if k:sub(1,1) ~= "." and not self.beenthere[oo:cid()] then
-                               section:error(ERR.OPT_UNKNOWN(oo))
+                       if k:byte(1) == 46 and not self.beenthere[oo:cid()] then
+                               section:error(ERR('OPT_UNKNOWN', oo))
                        end
                end
        end
@@ -281,14 +293,30 @@ function UVL._validate_option( self, option, nodeps )
 
        if not option:scheme() and not option:parent():scheme('dynamic') then
                if STRICT_UNKNOWN_OPTIONS then
-                       return false, option:error(ERR.OPT_UNKNOWN(option))
+                       return false, option:error(ERR('OPT_UNKNOWN', option))
                else
                        return true
                end
 
        elseif option:scheme() then
+               if not nodeps then
+                       local ok, err = dependencies.check( self, option )
+                       if not ok then
+                               if not err:is_all(
+                                       'OPT_REQUIRED',
+                                       'DEP_NOTEQUAL',
+                                       'DEP_NOVALUE'
+                               ) then
+                                       option:error(err)
+                                       return false, option:errors()
+                               else
+                                       return true
+                               end
+                       end
+               end
+
                if option:scheme('required') and not option:value() then
-                       return false, option:error(ERR.OPT_REQUIRED(option))
+                       return false, option:error(ERR('OPT_REQUIRED', option))
 
                elseif option:value() then
                        local val = option:value()
@@ -300,16 +328,17 @@ function UVL._validate_option( self, option, nodeps )
                                local config_values = ( type(val) == "table" and val or { val } )
                                for _, v in ipairs(config_values) do
                                        if not scheme_values[v] then
-                                               return false, option:error( ERR.OPT_BADVALUE(
-                                                       option, { v, luci.util.serialize_data(
-                                                               luci.util.keys(scheme_values)
+                                               return false, option:error( ERR(
+                                                       'OPT_BADVALUE',
+                                                       option, { v, util.serialize_data(
+                                                               util.keys(scheme_values)
                                                        ) }
                                                ) )
                                        end
                                end
                        elseif option:scheme('type') == "list" then
                                if type(val) ~= "table" and STRICT_LIST_TYPE then
-                                       return false, option:error(ERR.OPT_NOTLIST(option))
+                                       return false, option:error(ERR('OPT_NOTLIST', option))
                                end
                        end
 
@@ -321,24 +350,46 @@ function UVL._validate_option( self, option, nodeps )
                                        for i, v in ipairs(val) do
                                                if not self.datatypes[dt]( v ) then
                                                        return false, option:error(
-                                                               ERR.OPT_INVVALUE(option, { v, dt })
+                                                               ERR('OPT_INVVALUE', option, { v, dt })
                                                        )
                                                end
                                        end
                                else
-                                       return false, option:error(ERR.OPT_DATATYPE(option, dt))
+                                       return false, option:error(ERR('OPT_DATATYPE', option, dt))
                                end
                        end
-               end
 
-               if not nodeps then
-                       local ok, err = luci.uvl.dependencies.check( self, option )
-                       if not ok then
-                               option:error(err)
+                       val = ( type(val) == "table" and val or { val } )
+                       for _, v in ipairs(val) do
+                               if option:scheme('minlength') then
+                                       if #v < option:scheme('minlength') then
+                                               return false, option:error(ERR('OPT_RANGE', option))
+                                       end
+                               end
+
+                               if option:scheme('maxlength') then
+                                       if #v > option:scheme('maxlength') then
+                                               return false, option:error(ERR('OPT_RANGE', option))
+                                       end
+                               end
+
+                               local w = tonumber(v)
+
+                               if option:scheme('minimum') then
+                                       if not w or w < option:scheme('minimum') then
+                                               return false, option:error(ERR('OPT_RANGE', option))
+                                       end
+                               end
+
+                               if option:scheme('maximum') then
+                                       if not w or w > option:scheme('maximum') then
+                                               return false, option:error(ERR('OPT_RANGE', option))
+                                       end
+                               end
                        end
                end
 
-               local ok, err = luci.uvl.validation.check( self, option )
+               local ok, err = validation.check( self, option )
                if not ok and STRICT_EXTERNAL_VALIDATORS then
                        return false, option:error(err)
                end
@@ -350,31 +401,30 @@ end
 --- Find all parts of given scheme and construct validation tree.
 -- This is normally done on demand, so you don't have to call this function
 -- by yourself.
--- @param scheme       Name of the scheme to parse
+-- @param shm  Name of the scheme to parse
 -- @param alias                Create an alias for the loaded scheme
-function UVL.read_scheme( self, scheme, alias )
+function UVL.read_scheme( self, shm, alias )
 
-       local so = luci.uvl.scheme( self, scheme )
-       local bc = "%s/bytecode/%s.lua" %{ self.schemedir, scheme }
+       local so = scheme( self, shm )
+       local bc = "%s/bytecode/%s.lua" %{ self.schemedir, shm }
 
-       if not luci.fs.access(bc) then
-               local schemes = { }
-               local files = luci.fs.glob(self.schemedir .. '/*/' .. scheme)
+       if not fs.access(bc) then
+               local files = nutil.consume((fs.glob(self.schemedir .. '/*/' .. shm)))
 
-               if files then
+               if #files > 0 then
                        local ok, err
-                       for i, file in ipairs( files ) do
-                               if not luci.fs.access(file) then
-                                       return false, so:error(ERR.SME_READ(so,file))
+                       for _, file in ipairs(files) do
+                               if not fs.access(file) then
+                                       return false, so:error(ERR('SME_READ', so,file))
                                end
 
-                               local uci = luci.model.uci.cursor( luci.fs.dirname(file), default_savedir )
+                               local uci = uci.cursor( fs.dirname(file), default_savedir )
 
-                               local sname = luci.fs.basename(file)
+                               local sname = fs.basename(file)
                                local sd, err = uci:load( sname )
 
                                if not sd then
-                                       return false, ERR.UCILOAD(so, err)
+                                       return false, ERR('UCILOAD', so, err)
                                end
 
                                ok, err = pcall(function()
@@ -394,18 +444,18 @@ function UVL.read_scheme( self, scheme, alias )
                                end)
                        end
 
-                       if ok and alias then self.packages[alias] = self.packages[scheme] end
+                       if ok and alias then self.packages[alias] = self.packages[shm] end
                        return ok and self, err
                else
-                       return false, so:error(ERR.SME_FIND(so, self.schemedir))
+                       return false, so:error(ERR('SME_FIND', so, self.schemedir))
                end
        else
                local sc = loadfile(bc)
                if sc then
-                       self.packages[scheme] = sc()
+                       self.packages[shm] = sc()
                        return true
                else
-                       return false, so:error(ERR.SME_READ(so,bc))
+                       return false, so:error(ERR('SME_READ',so,bc))
                end
        end
 end
@@ -424,7 +474,7 @@ local function _req( t, n, c, r )
                                o = enum( scheme, nil, p, '(nil)', '(nil)', n )
                        end
 
-                       return false, ERR.SME_REQFLD(o,v)
+                       return false, ERR('SME_REQFLD',o,v)
                end
        end
        return true
@@ -450,7 +500,7 @@ local function _ref( c, t )
        r[1] = ( #r[1] > 0 and r[1] or scheme:sid() )
 
        if #r ~= n then
-               return false, ERR.SME_BADREF(scheme, k)
+               return false, ERR('SME_BADREF', scheme, k)
        end
 
        return r
@@ -497,12 +547,12 @@ function UVL._parse_section(self, scheme, k, v)
        local so = scheme:section(v.name)
 
        for k, v2 in pairs(v) do
-               if k ~= "name" and k ~= "package" and k:sub(1,1) ~= "." then
+               if k ~= "name" and k ~= "package" and k:byte(1) == 46 then
                        if k == "depends" then
                                s.depends = self:_read_dependency( v2, s.depends )
                                if not s.depends then
                                        return false, scheme:error(
-                                               ERR.SME_BADDEP(so, luci.util.serialize_data(s.depends))
+                                               ERR('SME_BADDEP', so, util.serialize_data(s.depends))
                                        )
                                end
                        elseif k == "dynamic" or k == "unique" or
@@ -521,8 +571,7 @@ function UVL._parse_section(self, scheme, k, v)
        s.named    = s.named    or false
 end
 
-
-       -- Step 2: get all variables
+-- Step 2: get all variables
 function UVL._parse_var(self, scheme, k, v)
        local ok, err = _req( TYPE_OPTION, k, v, { "name", "section" } )
        if err then error(scheme:error(err)) end
@@ -533,14 +582,14 @@ function UVL._parse_var(self, scheme, k, v)
        local p = self.packages[r[1]]
        if not p then
                error(scheme:error(
-                       ERR.SME_VBADPACK({scheme:sid(), '', v.name}, r[1])
+                       ERR('SME_VBADPACK', {scheme:sid(), '', v.name}, r[1])
                ))
        end
 
        local s = p.variables[r[2]]
        if not s then
                error(scheme:error(
-                       ERR.SME_VBADSECT({scheme:sid(), '', v.name}, r[2])
+                       ERR('SME_VBADSECT', {scheme:sid(), '', v.name}, r[2])
                ))
        end
 
@@ -551,32 +600,37 @@ function UVL._parse_var(self, scheme, k, v)
        local to = so:option(v.name)
 
        for k, v2 in pairs(v) do
-               if k ~= "name" and k ~= "section" and k:sub(1,1) ~= "." then
+               if k ~= "name" and k ~= "section" and k:byte(1) == 46 then
                        if k == "depends" then
                                t.depends = self:_read_dependency( v2, t.depends )
                                if not t.depends then
                                        error(scheme:error(so:error(
-                                               ERR.SME_BADDEP(to, luci.util.serialize_data(v2))
+                                               ERR('SME_BADDEP', to, util.serialize_data(v2))
                                        )))
                                end
                        elseif k == "validator" then
                                t.validators = self:_read_validator( v2, t.validators )
                                if not t.validators then
                                        error(scheme:error(so:error(
-                                               ERR.SME_BADVAL(to, luci.util.serialize_data(v2))
+                                               ERR('SME_BADVAL', to, util.serialize_data(v2))
                                        )))
                                end
                        elseif k == "valueof" then
                                local values, err = self:_read_reference( v2 )
                                if err then
                                        error(scheme:error(so:error(
-                                               ERR.REFERENCE(to, luci.util.serialize_data(v2)):child(err)
+                                               ERR('REFERENCE', to, util.serialize_data(v2)):child(err)
                                        )))
                                end
                                t.type   = "reference"
                                t.values = values
+                               t.valueof = type(v2) == "table" and v2 or {v2}
                        elseif k == "required" then
                                t[k] = _bool(v2)
+                       elseif k == "minlength" or k == "maxlength" or
+                   k == "minimum" or k == "maximum"
+            then
+                               t[k] = tonumber(v2)
                        else
                                t[k] = t[k] or v2
                        end
@@ -599,21 +653,21 @@ function UVL._parse_enum(self, scheme, k, v)
        local p = self.packages[r[1]]
        if not p then
                error(scheme:error(
-                       ERR.SME_EBADPACK({scheme:sid(), '', '', v.value}, r[1])
+                       ERR('SME_EBADPACK', {scheme:sid(), '', '', v.value}, r[1])
                ))
        end
 
        local s = p.variables[r[2]]
        if not s then
                error(scheme:error(
-                       ERR.SME_EBADSECT({scheme:sid(), '', '', v.value}, r[2])
+                       ERR('SME_EBADSECT', {scheme:sid(), '', '', v.value}, r[2])
                ))
        end
 
        local t = s[r[3]]
        if not t then
                error(scheme:error(
-                       ERR.SME_EBADOPT({scheme:sid(), '', '', v.value}, r[3])
+                       ERR('SME_EBADOPT', {scheme:sid(), '', '', v.value}, r[3])
                ))
        end
 
@@ -623,13 +677,15 @@ function UVL._parse_enum(self, scheme, k, v)
        local eo = oo:enum(v.value)
 
        if t.type ~= "enum" and t.type ~= "reference" then
-               error(scheme:error(ERR.SME_EBADTYPE(eo)))
+               error(scheme:error(ERR('SME_EBADTYPE', eo)))
        end
 
        if not t.values then
                t.values = { [v.value] = v.title or v.value }
+               t.valuelist = { {value = v.value, title = v.title} }
        else
                t.values[v.value] = v.title or v.value
+               t.valuelist[#t.valuelist + 1] = {value = v.value, title = v.title}
        end
 
        if not t.enum_depends then
@@ -638,7 +694,7 @@ function UVL._parse_enum(self, scheme, k, v)
 
        if v.default then
                if t.default then
-                       error(scheme:error(ERR.SME_EBADDEF(eo)))
+                       error(scheme:error(ERR('SME_EBADDEF', eo)))
                end
                t.default = v.value
        end
@@ -650,7 +706,7 @@ function UVL._parse_enum(self, scheme, k, v)
 
                if not t.enum_depends[v.value] then
                        error(scheme:error(so:error(oo:error(
-                               ERR.SME_BADDEP(eo, luci.util.serialize_data(v.depends))
+                               ERR('SME_BADDEP', eo, util.serialize_data(v.depends))
                        ))))
                end
        end
@@ -658,21 +714,18 @@ end
 
 -- Read a dependency specification
 function UVL._read_dependency( self, values, deps )
-       local expr = "%$?[a-zA-Z0-9_]+"
+       local expr = "%$?[%w_]+"
        if values then
                values = ( type(values) == "table" and values or { values } )
                for _, value in ipairs(values) do
-                       local parts     = luci.util.split( value, "%s*,%s*", nil, true )
                        local condition = { }
-                       for i, val in ipairs(parts) do
-                               local k, v = unpack(luci.util.split(val, "%s*=%s*", nil, true))
+                       for val in value:gmatch("[^,]+") do
+                               local k, e, v = val:match("%s*([%w$_.]+)%s*(=?)%s*(.*)")
 
                                if k and (
-                                       k:match("^"..expr.."%."..expr.."%."..expr.."$") or
-                                       k:match("^"..expr.."%."..expr.."$") or
-                                       k:match("^"..expr.."$")
+                                       k:match(PAT_EXPR1) or k:match(PAT_EXPR2) or k:match(PAT_EXPR3)
                                ) then
-                                       condition[k] = v or true
+                                       condition[k] = (e == '=') and v or true
                                else
                                        return nil
                                end
@@ -681,7 +734,7 @@ function UVL._read_dependency( self, values, deps )
                        if not deps then
                                deps = { condition }
                        else
-                               table.insert( deps, condition )
+                               deps[#deps+1] = condition
                        end
                end
        end
@@ -702,11 +755,11 @@ function UVL._read_validator( self, values, validators )
                                validator = self:_resolve_function( (value:gsub("^lua:","") ) )
                        elseif value:match("^regexp:") then
                                local pattern = value:gsub("^regexp:","")
-                               validator = function( type, dtype, pack, sect, optn, ... )
-                                       local values = { ... }
+                               validator = function( type, dtype, pack, sect, optn, arg1, arg2, arg3, arg4, arg5 )
+                                       local values = { arg1, arg2, arg3, arg4, arg5 }
                                        for _, v in ipairs(values) do
                                                local ok, match =
-                                                       luci.util.copcall( string.match, v, pattern )
+                                                       pcall( string.match, v, pattern )
 
                                                if not ok then
                                                        return false, match
@@ -725,7 +778,7 @@ function UVL._read_validator( self, values, validators )
                                if not validators then
                                        validators = { validator }
                                else
-                                       table.insert( validators, validator )
+                                       validators[#validators+1] = validator
                                end
                        else
                                return nil
@@ -742,17 +795,17 @@ function UVL._read_reference( self, values )
        values = ( type(values) == "table" and values or { values } )
 
        for _, value in ipairs(values) do
-               local ref = luci.util.split(value, ".")
+               local ref = util.split(value, ".")
 
                if #ref == 2 or #ref == 3 then
-                       local co = luci.uvl.config( self, ref[1] )
+                       local co = config( self, ref[1] )
                        if not co:config() then return false, co:errors() end
 
                        for k, v in pairs(co:config()) do
                                if v['.type'] == ref[2] then
                                        if #ref == 2 then
                                                if v['.anonymous'] == true then
-                                                       return false, ERR.SME_INVREF('', value)
+                                                       return false, ERR('SME_INVREF', '', value)
                                                end
                                                val[k] = k      -- XXX: title/description would be nice
                                        elseif v[ref[3]] then
@@ -761,7 +814,7 @@ function UVL._read_reference( self, values )
                                end
                        end
                else
-                       return false, ERR.SME_BADREF('', value)
+                       return false, ERR('SME_BADREF', '', value)
                end
        end
 
@@ -770,10 +823,10 @@ end
 
 -- Resolve given path
 function UVL._resolve_function( self, value )
-       local path = luci.util.split(value, ".")
+       local path = util.split(value, ".")
 
        for i=1, #path-1 do
-               local stat, mod = luci.util.copcall(
+               local stat, mod = pcall(
                        require, table.concat(path, ".", 1, i)
                )
 
@@ -797,7 +850,7 @@ end
 
 
 --- Object representation of an uvl item - base class.
-uvlitem = luci.util.class()
+uvlitem = util.class()
 
 function uvlitem.cid(self)
        if #self.cref == 1 then
@@ -807,7 +860,7 @@ function uvlitem.cid(self)
                local c = self.c
                if c and c[r[2]] and c[r[2]]['.anonymous'] and c[r[2]]['.index'] then
                        r[2] = '@' .. c[r[2]]['.type'] ..
-                              '[' .. tostring(c[r[2]]['.index']) .. ']'
+                                  '[' .. tostring(c[r[2]]['.index']) .. ']'
                end
                return table.concat( r, '.' )
        end
@@ -844,7 +897,7 @@ function uvlitem.config(self, opt)
                if #self.cref >= 3 then
                        c = c and c[self.cref[3]] or nil
                end
-       end     
+       end
 
        if c and opt then
                return c[opt]
@@ -859,24 +912,24 @@ function uvlitem.title(self)
 end
 
 function uvlitem.type(self)
-       if self.t == luci.uvl.TYPE_CONFIG then
+       if self.t == TYPE_CONFIG then
                return 'config'
-       elseif self.t == luci.uvl.TYPE_SECTION then
+       elseif self.t == TYPE_SECTION then
                return 'section'
-       elseif self.t == luci.uvl.TYPE_OPTION then
+       elseif self.t == TYPE_OPTION then
                return 'option'
-       elseif self.t == luci.uvl.TYPE_ENUM then
+       elseif self.t == TYPE_ENUM then
                return 'enum'
        end
 end
 
-function uvlitem.error(self, ...)
+function uvlitem.error(self, arg1, arg2, arg3, arg4, arg5)
        if not self.e then
-               local errconst = { ERR.CONFIG, ERR.SECTION, ERR.OPTION, ERR.OPTION }
-               self.e = errconst[#self.cref]( self )
+               local errconst = { 'CONFIG', 'SECTION', 'OPTION', 'OPTION' }
+               self.e = ERR( errconst[#self.cref], self )
        end
 
-       return self.e:child( ... )
+       return self.e:child( arg1, arg2, arg3, arg4, arg5 )
 end
 
 function uvlitem.errors(self)
@@ -891,22 +944,25 @@ function uvlitem.parent(self)
        if self.p then
                return self.p
        elseif #self.cref == 3 or #self.cref == 4 then
-               return luci.uvl.section( self.s, self.c, self.cref[1], self.cref[2] )
+               return section( self.s, self.c, self.cref[1], self.cref[2] )
        elseif #self.cref == 2 then
-               return luci.uvl.config( self.s, self.c, self.cref[1] )
+               return config( self.s, self.c, self.cref[1] )
        else
                return nil
        end
 end
 
-function uvlitem._loadconf(self, co, c)
+function uvlitem._loadconf(self, co, c, configdir)
+       co = co or self._configcache
        if not co then
-               local uci, err = luci.model.uci.cursor(), nil
-               co, err = uci:get_all(c)
+               local err
+               co, err = uci.cursor(configdir):get_all(c)
 
                if err then
-                       self:error(ERR.UCILOAD(self, err))
+                       self:error(ERR('UCILOAD', self, err))
                end
+
+               self._configcache = co
        end
        return co
 end
@@ -924,7 +980,7 @@ end
 -- @param co           Configuration data
 -- @param c                    Configuration name
 -- @return                     Config instance
-scheme = luci.util.class(uvlitem)
+scheme = util.class(uvlitem)
 
 function scheme.__init__(self, scheme, co, c)
        if not c then
@@ -933,22 +989,22 @@ function scheme.__init__(self, scheme, co, c)
 
        self.cref = { c }
        self.sref = { c }
-       self.c    = self:_loadconf(co, c)
+       self.c    = self:_loadconf(co, c, scheme.configdir)
        self.s    = scheme
-       self.t    = luci.uvl.TYPE_SCHEME
+       self.t    = TYPE_SCHEME
 end
 
 --- Add an error to scheme.
 -- @return     Scheme error context
-function scheme.error(self, ...)
-       if not self.e then self.e = ERR.SCHEME( self ) end
-       return self.e:child( ... )
+function scheme.error(self, arg1, arg2, arg3, arg4, arg5)
+       if not self.e then self.e = ERR( 'SCHEME', self ) end
+       return self.e:child( arg1, arg2, arg3, arg4, arg5 )
 end
 
 --- Get an associated config object.
 -- @return     Config instance
 function scheme.config(self)
-       local co = luci.uvl.config( self.s, self.cref[1] )
+       local co = config( self.s, self.cref[1] )
              co.p = self
 
        return co
@@ -960,9 +1016,9 @@ function scheme.sections(self)
        local v = { }
        if self.s.packages[self.sref[1]].sections then
                for o, _ in pairs( self.s.packages[self.sref[1]].sections ) do
-                       table.insert( v, luci.uvl.option(
+                       v[#v+1] = option(
                                self.s, self.c, self.cref[1], self.cref[2], o
-                       ) )
+                       )
                end
        end
        return v
@@ -972,7 +1028,7 @@ end
 -- @param s    Section to select
 -- @return     Section instance
 function scheme.section(self, s)
-       local so = luci.uvl.section( self.s, self.c, self.cref[1], s )
+       local so = section( self.s, self.c, self.cref[1], s )
              so.p = self
 
        return so
@@ -991,18 +1047,17 @@ end
 -- @param co           Configuration data
 -- @param c                    Configuration name
 -- @return                     Config instance
-config = luci.util.class(uvlitem)
+config = util.class(uvlitem)
 
 function config.__init__(self, scheme, co, c)
        if not c then
                c, co = co, nil
        end
-
        self.cref = { c }
        self.sref = { c }
-       self.c    = self:_loadconf(co, c)
+       self.c    = self:_loadconf(co, c, scheme.configdir)
        self.s    = scheme
-       self.t    = luci.uvl.TYPE_CONFIG
+       self.t    = TYPE_CONFIG
 end
 
 --- Get all section objects associated with this config.
@@ -1011,9 +1066,9 @@ function config.sections(self)
        local v = { }
        if self.s.packages[self.sref[1]].sections then
                for o, _ in pairs( self.s.packages[self.sref[1]].sections ) do
-                       table.insert( v, luci.uvl.option(
+                       v[#v+1] = option(
                                self.s, self.c, self.cref[1], self.cref[2], o
-                       ) )
+                       )
                end
        end
        return v
@@ -1023,7 +1078,7 @@ end
 -- @param s    Section to select
 -- @return     Section instance
 function config.section(self, s)
-       local so = luci.uvl.section( self.s, self.c, self.cref[1], s )
+       local so = section( self.s, self.c, self.cref[1], s )
              so.p = self
 
        return so
@@ -1043,14 +1098,14 @@ end
 -- @param c                    Configuration name
 -- @param s                    Section name
 -- @return                     Section instance
-section = luci.util.class(uvlitem)
+section = util.class(uvlitem)
 
 function section.__init__(self, scheme, co, c, s)
        self.cref = { c, s }
        self.sref = { c, co and co[s] and co[s]['.type'] or s }
-       self.c    = self:_loadconf(co, c)
+       self.c    = self:_loadconf(co, c, scheme.configdir)
        self.s    = scheme
-       self.t    = luci.uvl.TYPE_SECTION
+       self.t    = TYPE_SECTION
 end
 
 --- Get all option objects associated with this section.
@@ -1061,9 +1116,9 @@ function section.variables(self)
                for o, _ in pairs(
                        self.s.packages[self.sref[1]].variables[self.sref[2]]
                ) do
-                       table.insert( v, luci.uvl.option(
+                       v[#v+1] = option(
                                self.s, self.c, self.cref[1], self.cref[2], o
-                       ) )
+                       )
                end
        end
        return v
@@ -1073,7 +1128,7 @@ end
 -- @param o    Option to select
 -- @return     Option instance
 function section.option(self, o)
-       local oo = luci.uvl.option( self.s, self.c, self.cref[1], self.cref[2], o )
+       local oo = option( self.s, self.c, self.cref[1], self.cref[2], o )
              oo.p = self
 
        return oo
@@ -1094,14 +1149,14 @@ end
 -- @param s                    Section name
 -- @param o                    Option name
 -- @return                     Option instance
-option = luci.util.class(uvlitem)
+option = util.class(uvlitem)
 
 function option.__init__(self, scheme, co, c, s, o)
        self.cref = { c, s, o }
        self.sref = { c, co and co[s] and co[s]['.type'] or s, o }
-       self.c    = self:_loadconf(co, c)
+       self.c    = self:_loadconf(co, c, scheme.configdir)
        self.s    = scheme
-       self.t    = luci.uvl.TYPE_OPTION
+       self.t    = TYPE_OPTION
 end
 
 --- Get the value of this option.
@@ -1109,7 +1164,7 @@ end
 function option.value(self)
        local v = self:config() or self:scheme('default')
        if v and self:scheme('multival') then
-               v = luci.util.split( v, "%s+", nil, true )
+               v = util.split( v, "%s+", nil, true )
        end
        return v
 end
@@ -1147,12 +1202,12 @@ end
 -- @param o                    Enum name
 -- @param v                    Enum value
 -- @return                     Enum value instance
-enum = luci.util.class(option)
+enum = util.class(option)
 
 function enum.__init__(self, scheme, co, c, s, o, v)
        self.cref = { c, s, o, v }
        self.sref = { c, co and co[s] and co[s]['.type'] or s, o, v }
-       self.c    = self:_loadconf(co, c)
+       self.c    = self:_loadconf(co, c, scheme.configdir)
        self.s    = scheme
-       self.t    = luci.uvl.TYPE_ENUM
+       self.t    = TYPE_ENUM
 end