libs/uvl/luasrc/uvl/dependencies.lua

   1 --[[
   2
   3 UCI Validation Layer - Dependency helper
   4 (c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   5 (c) 2008 Steven Barth <steven@midlink.org>
   6
   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
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 module( "luci.uvl.dependencies", package.seeall )
  18
  19 function _parse_reference( r, c, s, o )
  20         local ref  = { }
  21         local vars = {
  22                 config  = ( c or '$config'  ),
  23                 section = ( s or '$section' ),
  24                 option  = ( o or '$option'  )
  25         }
  26
  27         for i, v in ipairs(luci.util.split(r,".")) do
  28                 table.insert(ref, (v:gsub( "%$(.+)", function(n) return vars[n] end )))
  29         end
  30
  31         if c or s then
  32                 if #ref == 1 and c and s then
  33                         ref = { c, s, ref[1] }
  34                 elseif #ref == 2 and c then
  35                         ref = { c, unpack(ref) }
  36                 elseif #ref ~= 3 then
  37                         ref = nil
  38                 end
  39         else
  40                 if #ref == 1 then
  41                         ref = { '$config', '$section', ref[1] }
  42                 elseif #ref == 2 then
  43                         ref = { '$config', unpack(ref) }
  44                 elseif #ref ~= 3 then
  45                         ref = nil
  46                 end
  47         end
  48
  49         return ref
  50 end
  51
  52 function check( self, object, nodeps )
  53
  54         if not self.beenthere[object:cid()] then
  55                 self.beenthere[object:cid()] = true
  56         else
  57                 return false, "Recursive dependency for '" .. object:sid() .. "' found"
  58         end
  59
  60         local item = object.type == luci.uvl.TYPE_SECTION
  61                 and object:section() or object:option()
  62
  63         if item.depends then
  64                 local ok = false
  65                 local valid, err = false,
  66                         string.format( 'In dependency check for %s "%s":',
  67                                 ( object.type == luci.uvl.TYPE_SECTION and "section" or "option" ),
  68                                 object:cid() )
  69
  70                 for _, dep in ipairs(item.depends) do
  71                         local subcondition = true
  72                         for k, v in pairs(dep) do
  73                                 -- XXX: better error
  74                                 local ref = _parse_reference( k, unpack(object.cref) )
  75
  76                                 if not ref then
  77                                         return false, "Ambiguous dependency reference '" .. k ..
  78                                                 "' for object '" .. object:sid() .. "' given"
  79                                 end
  80
  81                                 local option = luci.uvl.option(
  82                                         self, object.config,
  83                                         object.config[ref[2]]
  84                                                 and object.config[ref[2]]['.type']
  85                                                 or  object.sref[2],
  86                                         ref[1], ref[2], ref[3]
  87                                 )
  88
  89                                 valid, err2 = self:_validate_option( option, true )
  90                                 if valid then
  91                                         if not (
  92                                                 ( type(v) == "boolean" and object.config[ref[2]][ref[3]] ) or
  93                                                 ( ref[3] and object.config[ref[2]][ref[3]] ) == v
  94                                         ) then
  95                                                 subcondition = false
  96                                                 err = err .. "\n" ..
  97                                                         self.log.dump_dependency( dep, ref, v )
  98                                                 break
  99                                         end
 100                                 else
 101                                         subcondition = false
 102                                         err = err .. "\n" ..
 103                                                 self.log.dump_dependency( dep, ref, nil, err2 )
 104                                         break
 105                                 end
 106                         end
 107
 108                         if subcondition then
 109                                 return true
 110                         end
 111                 end
 112
 113                 return false, err
 114         end
 115
 116         return true
 117 end