3 UCI Validation Layer - Main Library
4 (c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
5 (c) 2008 Steven Barth <steven@midlink.org>
7 Licensed under the Apache License, Version 2.0 (the "License");
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
11 http://www.apache.org/licenses/LICENSE-2.0
18 --- UVL - UCI Validation Layer
22 module( "luci.uvl", package.seeall )
26 require("luci.model.uci")
27 require("luci.uvl.errors")
28 require("luci.uvl.datatypes")
29 require("luci.uvl.validation")
30 require("luci.uvl.dependencies")
39 --- Boolean; default true;
40 -- treat sections found in config but not in scheme as error
41 STRICT_UNKNOWN_SECTIONS = true
43 --- Boolean; default true;
44 -- treat options found in config but not in scheme as error
45 STRICT_UNKNOWN_OPTIONS = true
47 --- Boolean; default true;
48 -- treat failed external validators as error
49 STRICT_EXTERNAL_VALIDATORS = true
51 --- Boolean; default true;
52 -- treat list values stored as options like errors
53 STRICT_LIST_TYPE = true
56 local default_schemedir = "/lib/uci/schema"
57 local default_savedir = "/tmp/.uvl"
58 local ERR = luci.uvl.errors
61 --- Object constructor
64 -- @param schemedir Path to the scheme directory (optional)
65 -- @return Instance object
66 UVL = luci.util.class()
68 function UVL.__init__( self, schemedir )
69 self.schemedir = schemedir or default_schemedir
73 self.uci = luci.model.uci
74 self.err = luci.uvl.errors
75 self.dep = luci.uvl.dependencies
76 self.datatypes = luci.uvl.datatypes
80 --- Parse given scheme and return the scheme tree.
81 -- @param scheme Name of the scheme to parse
82 -- @return Table containing the parsed scheme or nil on error
83 -- @return String containing the reason for errors (if any)
84 function UVL.get_scheme( self, scheme )
85 if not self.packages[scheme] then
86 local ok, err = self:read_scheme( scheme )
91 return self.packages[scheme], nil
94 --- Validate given configuration, section or option.
95 -- @param config Name of the configuration to validate
96 -- @param section Name of the section to validate (optional)
97 -- @param option Name of the option to validate (optional)
98 -- @return Boolean indicating whether the given config validates
99 -- @return String containing the reason for errors (if any)
100 function UVL.validate( self, config, section, option )
101 if config and section and option then
102 return self:validate_option( config, section, option )
103 elseif config and section then
104 return self:validate_section( config, section )
106 return self:validate_config( config )
110 --- Validate given configuration.
111 -- @param config Name of the configuration to validate
112 -- @return Boolean indicating whether the given config validates
113 -- @return String containing the reason for errors (if any)
114 function UVL.validate_config( self, config, uci )
116 if not self.packages[config] then
117 local ok, err = self:read_scheme(config)
123 local co = luci.uvl.config( self, uci or config, uci and config )
129 if not co:config() then
130 return false, co:errors()
133 local function _uci_foreach( type, func )
134 for k, v in pairs(co:config()) do
135 if v['.type'] == type then
136 sc[type] = sc[type] + 1
137 local ok, err = func( k, v )
138 if not ok then co:error(err) end
143 for k, v in pairs( self.packages[config].sections ) do
147 return self:_validate_section( co:section(s) )
152 if STRICT_UNKNOWN_SECTIONS then
153 for k, v in pairs(co:config()) do
154 local so = co:section(k)
155 if not self.beenthere[so:cid()] then
156 co:error(ERR.SECT_UNKNOWN(so))
161 for _, k in ipairs(luci.util.keys(sc)) do
162 local so = co:section(k)
163 if so:scheme('required') and sc[k] == 0 then
164 co:error(ERR.SECT_REQUIRED(so))
165 elseif so:scheme('unique') and sc[k] > 1 then
166 co:error(ERR.SECT_UNIQUE(so))
170 return co:ok(), co:errors()
173 --- Validate given config section.
174 -- @param config Name of the configuration to validate
175 -- @param section Name of the section to validate
176 -- @return Boolean indicating whether the given config validates
177 -- @return String containing the reason for errors (if any)
178 function UVL.validate_section( self, config, section, uci )
180 if not self.packages[config] then
181 local ok, err = self:read_scheme( config )
187 local co = luci.uvl.config( self, uci or config, uci and config )
188 local so = co:section( section )
193 if not co:config() then
194 return false, co:errors()
198 return self:_validate_section( so )
200 return false, ERR.SECT_NOTFOUND(so)
204 --- Validate given config option.
205 -- @param config Name of the configuration to validate
206 -- @param section Name of the section to validate
207 -- @param option Name of the option to validate
208 -- @return Boolean indicating whether the given config validates
209 -- @return String containing the reason for errors (if any)
210 function UVL.validate_option( self, config, section, option, uci )
212 if not self.packages[config] then
213 local ok, err = self:read_scheme( config )
219 local co = luci.uvl.config( self, uci or config, uci and config )
220 local so = co:section( section )
221 local oo = so:option( option )
223 if not co:config() then
224 return false, co:errors()
227 if so:config() and oo:config() then
228 return self:_validate_option( oo )
230 return false, ERR.OPT_NOTFOUND(oo)
235 function UVL._validate_section( self, section )
237 self.beenthere[section:cid()] = true
239 if section:config() then
240 if section:scheme('named') == true and
241 section:config('.anonymous') == true
243 return false, ERR.SECT_NAMED(section)
246 for _, v in ipairs(section:variables()) do
247 local ok, err = self:_validate_option( v )
249 v:scheme('required') or v:scheme('type') == "enum" or (
250 not err:is(ERR.ERR_DEP_NOTEQUAL) and
251 not err:is(ERR.ERR_DEP_NOVALUE)
258 local ok, err = luci.uvl.dependencies.check( self, section )
263 return false, ERR.SECT_NOTFOUND(section)
266 if STRICT_UNKNOWN_OPTIONS and not section:scheme('dynamic') then
267 for k, v in pairs(section:config()) do
268 local oo = section:option(k)
269 if k:sub(1,1) ~= "." and not self.beenthere[oo:cid()] then
270 section:error(ERR.OPT_UNKNOWN(oo))
275 return section:ok(), section:errors()
278 function UVL._validate_option( self, option, nodeps )
280 self.beenthere[option:cid()] = true
282 if not option:scheme() and not option:parent():scheme('dynamic') then
283 return false, option:error(ERR.OPT_UNKNOWN(option))
285 elseif option:scheme() then
286 if option:scheme('required') and not option:value() then
287 return false, option:error(ERR.OPT_REQUIRED(option))
289 elseif option:value() then
290 local val = option:value()
292 if option:scheme('type') == "reference" or
293 option:scheme('type') == "enum"
295 if not option:scheme('values') or
296 not option:scheme('values')[val]
298 return false, option:error( ERR.OPT_BADVALUE(
299 option, luci.util.serialize_data(
300 luci.util.keys(option:scheme('values') or {})
304 elseif option:scheme('type') == "list" then
305 if type(val) ~= "table" and STRICT_LIST_TYPE then
306 return false, option:error(ERR.OPT_NOTLIST(option))
310 if option:scheme('datatype') then
311 local dt = option:scheme('datatype')
313 if self.datatypes[dt] then
314 val = ( type(val) == "table" and val or { val } )
315 for i, v in ipairs(val) do
316 if not self.datatypes[dt]( v ) then
317 return false, option:error(
318 ERR.OPT_INVVALUE(option, dt)
323 return false, option:error(ERR.OPT_DATATYPE(option, dt))
329 local ok, err = luci.uvl.dependencies.check( self, option )
335 local ok, err = luci.uvl.validation.check( self, option )
336 if not ok and STRICT_EXTERNAL_VALIDATORS then
337 return false, option:error(err)
341 return option:ok(), option:errors()
344 --- Find all parts of given scheme and construct validation tree.
345 -- This is normally done on demand, so you don't have to call this function
347 -- @param scheme Name of the scheme to parse
348 function UVL.read_scheme( self, scheme )
350 local so = luci.uvl.scheme( self, scheme )
353 local files = luci.fs.glob(self.schemedir .. '/*/' .. scheme)
356 for i, file in ipairs( files ) do
357 if not luci.fs.access(file) then
358 return so:error(ERR.SME_READ(so,file))
361 local uci = luci.model.uci.cursor( luci.fs.dirname(file), default_savedir )
363 local sd, err = uci:get_all( luci.fs.basename(file) )
366 return false, ERR.UCILOAD(so, err)
369 table.insert( schemes, sd )
372 return self:_read_scheme_parts( so, schemes )
374 return false, so:error(ERR.SME_FIND(so, self.schemedir))
378 -- Process all given parts and construct validation tree
379 function UVL._read_scheme_parts( self, scheme, schemes )
381 -- helper function to check for required fields
382 local function _req( t, n, c, r )
383 for i, v in ipairs(r) do
385 local p, o = scheme:sid(), nil
387 if t == TYPE_SECTION then
388 o = section( scheme, nil, p, n )
389 elseif t == TYPE_OPTION then
390 o = option( scheme, nil, p, '(nil)', n )
391 elseif t == TYPE_ENUM then
392 o = enum( scheme, nil, p, '(nil)', '(nil)', n )
395 return false, ERR.SME_REQFLD(o,v)
401 -- helper function to validate references
402 local function _ref( c, t )
404 if c == TYPE_SECTION then
407 elseif c == TYPE_OPTION then
410 elseif c == TYPE_ENUM then
415 local r = luci.util.split( t[k], "." )
416 r[1] = ( #r[1] > 0 and r[1] or scheme:sid() )
419 return false, ERR.SME_BADREF(scheme, k)
425 -- helper function to read bools
426 local function _bool( v )
427 return ( v == "true" or v == "yes" or v == "on" or v == "1" )
433 -- Step 0: get package meta information
434 for i, conf in ipairs( schemes ) do
435 for k, v in pairs( conf ) do
436 if v['.type'] == 'package' then
437 self.packages[scheme:sid()] =
438 self.packages[scheme:sid()] or {
439 ["name"] = scheme:sid();
444 for k, v2 in pairs(v) do
445 if k == "title" or k == "description" then
446 self.packages[scheme:sid()][k] = v2
453 -- Step 1: get all sections
454 for i, conf in ipairs( schemes ) do
455 for k, v in pairs( conf ) do
456 if v['.type'] == 'section' then
458 ok, err = _req( TYPE_SECTION, k, v, { "name", "package" } )
459 if err then return false, scheme:error(err) end
461 local r, err = _ref( TYPE_SECTION, v )
462 if err then return false, scheme:error(err) end
464 self.packages[r[1]] =
465 self.packages[r[1]] or {
471 local p = self.packages[r[1]]
472 p.sections[v.name] = p.sections[v.name] or { }
473 p.variables[v.name] = p.variables[v.name] or { }
475 local s = p.sections[v.name]
476 local so = scheme:section(v.name)
478 for k, v2 in pairs(v) do
479 if k ~= "name" and k ~= "package" and k:sub(1,1) ~= "." then
480 if k == "depends" then
481 s.depends = self:_read_dependency( v2, s.depends )
482 if not s.depends then
483 return false, scheme:error(
484 ERR.SME_BADDEP(so, luci.util.serialize_data(s.depends))
487 elseif k == "dynamic" or k == "unique" or
488 k == "required" or k == "named"
497 s.dynamic = s.dynamic or false
498 s.unique = s.unique or false
499 s.required = s.required or false
500 s.named = s.named or false
505 -- Step 2: get all variables
506 for i, conf in ipairs( schemes ) do
507 for k, v in pairs( conf ) do
508 if v['.type'] == "variable" then
510 ok, err = _req( TYPE_OPTION, k, v, { "name", "section" } )
511 if err then return false, scheme:error(err) end
513 local r, err = _ref( TYPE_OPTION, v )
514 if err then return false, scheme:error(err) end
516 local p = self.packages[r[1]]
518 return false, scheme:error(
519 ERR.SME_VBADPACK({scheme:sid(), '', v.name}, r[1])
523 local s = p.variables[r[2]]
525 return false, scheme:error(
526 ERR.SME_VBADSECT({scheme:sid(), '', v.name}, r[2])
530 s[v.name] = s[v.name] or { }
533 local so = scheme:section(r[2])
534 local to = so:option(v.name)
536 for k, v2 in pairs(v) do
537 if k ~= "name" and k ~= "section" and k:sub(1,1) ~= "." then
538 if k == "depends" then
539 t.depends = self:_read_dependency( v2, t.depends )
540 if not t.depends then
541 return false, scheme:error(so:error(
542 ERR.SME_BADDEP(to, luci.util.serialize_data(v2))
545 elseif k == "validator" then
546 t.validators = self:_read_validator( v2, t.validators )
547 if not t.validators then
548 return false, scheme:error(so:error(
549 ERR.SME_BADVAL(to, luci.util.serialize_data(v2))
552 elseif k == "valueof" then
553 local values, err = self:_read_reference( v2 )
555 return false, scheme:error(so:error(
556 ERR.REFERENCE(to, luci.util.serialize_data(v2)):child(err)
561 elseif k == "required" then
569 t.type = t.type or "variable"
570 t.datatype = t.datatype or "string"
571 t.required = t.required or false
576 -- Step 3: get all enums
577 for i, conf in ipairs( schemes ) do
578 for k, v in pairs( conf ) do
579 if v['.type'] == "enum" then
581 ok, err = _req( TYPE_ENUM, k, v, { "value", "variable" } )
582 if err then return false, scheme:error(err) end
584 local r, err = _ref( TYPE_ENUM, v )
585 if err then return false, scheme:error(err) end
587 local p = self.packages[r[1]]
589 return false, scheme:error(
590 ERR.SME_EBADPACK({scheme:sid(), '', '', v.value}, r[1])
594 local s = p.variables[r[2]]
596 return false, scheme:error(
597 ERR.SME_EBADSECT({scheme:sid(), '', '', v.value}, r[2])
603 return false, scheme:error(
604 ERR.SME_EBADOPT({scheme:sid(), '', '', v.value}, r[3])
609 local so = scheme:section(r[2])
610 local oo = so:option(r[3])
611 local eo = oo:enum(v.value)
613 if t.type ~= "enum" then
614 return false, scheme:error(ERR.SME_EBADTYPE(eo))
618 t.values = { [v.value] = v.title or v.value }
620 t.values[v.value] = v.title or v.value
623 if not t.enum_depends then
629 return false, scheme:error(ERR.SME_EBADDEF(eo))
635 t.enum_depends[v.value] = self:_read_dependency(
636 v.depends, t.enum_depends[v.value]
639 if not t.enum_depends[v.value] then
640 return false, scheme:error(so:error(oo:error(
641 ERR.SME_BADDEP(eo, luci.util.serialize_data(v.depends))
652 -- Read a dependency specification
653 function UVL._read_dependency( self, values, deps )
654 local expr = "%$?[a-zA-Z0-9_]+"
656 values = ( type(values) == "table" and values or { values } )
657 for _, value in ipairs(values) do
658 local parts = luci.util.split( value, "%s*,%s*", nil, true )
659 local condition = { }
660 for i, val in ipairs(parts) do
661 local k, v = unpack(luci.util.split(val, "%s*=%s*", nil, true))
664 k:match("^"..expr.."%."..expr.."%."..expr.."$") or
665 k:match("^"..expr.."%."..expr.."$") or
666 k:match("^"..expr.."$")
668 condition[k] = v or true
677 table.insert( deps, condition )
685 -- Read a validator specification
686 function UVL._read_validator( self, values, validators )
688 values = ( type(values) == "table" and values or { values } )
689 for _, value in ipairs(values) do
692 if value:match("^exec:") then
693 validator = value:gsub("^exec:","")
694 elseif value:match("^lua:") then
695 validator = self:_resolve_function( (value:gsub("^lua:","") ) )
696 elseif value:match("^regexp:") then
697 local pattern = value:gsub("^regexp:","")
698 validator = function( type, dtype, pack, sect, optn, ... )
699 local values = { ... }
700 for _, v in ipairs(values) do
702 luci.util.copcall( string.match, v, pattern )
706 elseif not match then
708 'Value "%s" does not match pattern "%s"' % {
718 if not validators then
719 validators = { validator }
721 table.insert( validators, validator )
732 -- Read a reference specification (XXX: We should validate external configs too...)
733 function UVL._read_reference( self, values )
735 values = ( type(values) == "table" and values or { values } )
737 for _, value in ipairs(values) do
738 local ref = luci.util.split(value, ".")
740 if #ref == 2 or #ref == 3 then
741 local co = luci.uvl.config( self, ref[1] )
742 if not co:config() then return false, co:errors() end
744 for k, v in pairs(co:config()) do
745 if v['.type'] == ref[2] then
747 if v['.anonymous'] == true then
748 return false, ERR.SME_INVREF('', value)
750 val[k] = k -- XXX: title/description would be nice
751 elseif v[ref[3]] then
752 val[v[ref[3]]] = v[ref[3]] -- XXX: dito
757 return false, ERR.SME_BADREF('', value)
764 -- Resolve given path
765 function UVL._resolve_function( self, value )
766 local path = luci.util.split(value, ".")
769 local stat, mod = luci.util.copcall(
770 require, table.concat(path, ".", 1, i)
774 for j=i+1, #path-1 do
775 if not type(mod) == "table" then
783 mod = type(mod) == "table" and mod[path[#path]] or nil
784 if type(mod) == "function" then
792 --- Object representation of an uvl item - base class.
793 uvlitem = luci.util.class()
795 function uvlitem.cid(self)
796 return table.concat( self.cref, '.' )
799 function uvlitem.sid(self)
800 return table.concat( self.sref, '.' )
803 function uvlitem.scheme(self, opt)
806 if #self.sref == 4 or #self.sref == 3 then
807 s = self.s and self.s.packages
808 s = s and s[self.sref[1]]
809 s = s and s.variables
810 s = s and s[self.sref[2]]
811 s = s and s[self.sref[3]]
812 elseif #self.sref == 2 then
813 s = self.s and self.s.packages
814 s = s and s[self.sref[1]]
816 s = s and s[self.sref[2]]
818 s = self.s and self.s.packages
819 s = s and s[self.sref[1]]
829 function uvlitem.config(self, opt)
832 if #self.cref == 4 or #self.cref == 3 then
833 c = self.c and self.c[self.cref[2]] or nil
834 c = c and c[self.cref[3]] or nil
835 elseif #self.cref == 2 then
836 c = self.c and self.c[self.cref[2]] or nil
848 function uvlitem.title(self)
849 return self:scheme() and self:scheme('title') or
850 self.cref[3] or self.cref[2] or self.cref[1]
853 function uvlitem.type(self)
854 if self.t == luci.uvl.TYPE_CONFIG then
856 elseif self.t == luci.uvl.TYPE_SECTION then
858 elseif self.t == luci.uvl.TYPE_OPTION then
860 elseif self.t == luci.uvl.TYPE_ENUM then
865 function uvlitem.error(self, ...)
867 local errconst = { ERR.CONFIG, ERR.SECTION, ERR.OPTION, ERR.OPTION }
868 self.e = errconst[#self.cref]( self )
871 return self.e:child( ... )
874 function uvlitem.errors(self)
878 function uvlitem.ok(self)
879 return not self:errors()
882 function uvlitem.parent(self)
885 elseif #self.cref == 3 or #self.cref == 4 then
886 return luci.uvl.section( self.s, self.c, self.cref[1], self.cref[2] )
887 elseif #self.cref == 2 then
888 return luci.uvl.config( self.s, self.c, self.cref[1] )
894 function uvlitem._loadconf(self, co, c)
896 local uci, err = luci.model.uci.cursor(), nil
897 co, err = uci:get_all(c)
900 self:error(ERR.UCILOAD(self, err))
907 --- Object representation of a scheme.
910 -- @name luci.uvl.scheme
912 --- Scheme instance constructor.
915 -- @param scheme Scheme instance
916 -- @param co Configuration data
917 -- @param c Configuration name
918 -- @return Config instance
919 scheme = luci.util.class(uvlitem)
921 function scheme.__init__(self, scheme, co, c)
928 self.c = self:_loadconf(co, c)
930 self.t = luci.uvl.TYPE_SCHEME
933 --- Add an error to scheme.
934 -- @return Scheme error context
935 function scheme.error(self, ...)
936 if not self.e then self.e = ERR.SCHEME( self ) end
937 return self.e:child( ... )
940 --- Get an associated config object.
941 -- @return Config instance
942 function scheme.config(self)
943 local co = luci.uvl.config( self.s, self.cref[1] )
949 --- Get all section objects associated with this scheme.
950 -- @return Table containing all associated luci.uvl.section instances
951 function scheme.sections(self)
953 if self.s.packages[self.sref[1]].sections then
954 for o, _ in pairs( self.s.packages[self.sref[1]].sections ) do
955 table.insert( v, luci.uvl.option(
956 self.s, self.c, self.cref[1], self.cref[2], o
963 --- Get an associated section object.
964 -- @param s Section to select
965 -- @return Section instance
966 function scheme.section(self, s)
967 local so = luci.uvl.section( self.s, self.c, self.cref[1], s )
974 --- Object representation of a config.
977 -- @name luci.uvl.config
979 --- Config instance constructor.
982 -- @param scheme Scheme instance
983 -- @param co Configuration data
984 -- @param c Configuration name
985 -- @return Config instance
986 config = luci.util.class(uvlitem)
988 function config.__init__(self, scheme, co, c)
995 self.c = self:_loadconf(co, c)
997 self.t = luci.uvl.TYPE_CONFIG
1000 --- Get all section objects associated with this config.
1001 -- @return Table containing all associated luci.uvl.section instances
1002 function config.sections(self)
1004 if self.s.packages[self.sref[1]].sections then
1005 for o, _ in pairs( self.s.packages[self.sref[1]].sections ) do
1006 table.insert( v, luci.uvl.option(
1007 self.s, self.c, self.cref[1], self.cref[2], o
1014 --- Get an associated section object.
1015 -- @param s Section to select
1016 -- @return Section instance
1017 function config.section(self, s)
1018 local so = luci.uvl.section( self.s, self.c, self.cref[1], s )
1025 --- Object representation of a scheme/config section.
1028 -- @name luci.uvl.section
1030 --- Section instance constructor.
1033 -- @param scheme Scheme instance
1034 -- @param co Configuration data
1035 -- @param c Configuration name
1036 -- @param s Section name
1037 -- @return Section instance
1038 section = luci.util.class(uvlitem)
1040 function section.__init__(self, scheme, co, c, s)
1041 self.cref = { c, s }
1042 self.sref = { c, co and co[s] and co[s]['.type'] or s }
1043 self.c = self:_loadconf(co, c)
1045 self.t = luci.uvl.TYPE_SECTION
1048 --- Get all option objects associated with this section.
1049 -- @return Table containing all associated luci.uvl.option instances
1050 function section.variables(self)
1052 if self.s.packages[self.sref[1]].variables[self.sref[2]] then
1054 self.s.packages[self.sref[1]].variables[self.sref[2]]
1056 table.insert( v, luci.uvl.option(
1057 self.s, self.c, self.cref[1], self.cref[2], o
1064 --- Get an associated option object.
1065 -- @param o Option to select
1066 -- @return Option instance
1067 function section.option(self, o)
1068 local oo = luci.uvl.option( self.s, self.c, self.cref[1], self.cref[2], o )
1075 --- Object representation of a scheme/config option.
1078 -- @name luci.uvl.option
1080 --- Section instance constructor.
1083 -- @param scheme Scheme instance
1084 -- @param co Configuration data
1085 -- @param c Configuration name
1086 -- @param s Section name
1087 -- @param o Option name
1088 -- @return Option instance
1089 option = luci.util.class(uvlitem)
1091 function option.__init__(self, scheme, co, c, s, o)
1092 self.cref = { c, s, o }
1093 self.sref = { c, co and co[s] and co[s]['.type'] or s, o }
1094 self.c = self:_loadconf(co, c)
1096 self.t = luci.uvl.TYPE_OPTION
1099 --- Get the value of this option.
1100 -- @return The associated configuration value
1101 function option.value(self)
1102 return self:config()
1105 --- Get the associated section information in scheme.
1106 -- @return Table containing the scheme properties
1107 function option.section(self)
1108 return self.s.packages[self.sref[1]].sections[self.sref[2]]
1111 --- Construct an enum object instance from given or default value.
1112 -- @param v Value to select
1113 -- @return Enum instance for selected value
1114 function option.enum(self, val)
1117 self.cref[1], self.cref[2], self.cref[3],
1123 --- Object representation of a enum value.
1126 -- @name luci.uvl.enum
1128 --- Section instance constructor.
1131 -- @param scheme Scheme instance
1132 -- @param co Configuration data
1133 -- @param c Configuration name
1134 -- @param s Section name
1135 -- @param o Enum name
1136 -- @param v Enum value
1137 -- @return Enum value instance
1138 enum = luci.util.class(option)
1140 function enum.__init__(self, scheme, co, c, s, o, v)
1141 self.cref = { c, s, o, v }
1142 self.sref = { c, co and co[s] and co[s]['.type'] or s, o, v }
1143 self.c = self:_loadconf(co, c)
1145 self.t = luci.uvl.TYPE_ENUM