---[[
-LuCI - Lua Configuration Interface
-
-Copyright 2008 Steven Barth <steven@midlink.org>
-Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
-
-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
-
-$Id$
-
-Decoder:
- Info:
- null will be decoded to luci.json.null if first parameter of Decoder() is true
-
- Example:
- decoder = luci.json.Decoder()
- luci.ltn12.pump.all(luci.ltn12.source.string("decodableJSON"), decoder:sink())
- luci.util.dumptable(decoder:get())
-
- Known issues:
- does not support unicode conversion \uXXYY with XX != 00 will be ignored
-
-
-Encoder:
- Info:
- Accepts numbers, strings, nil, booleans as they are
- Accepts luci.json.null as replacement for nil
- Accepts full associative and full numerically indexed tables
- Mixed tables will loose their associative values during conversion
- Iterator functions will be encoded as an array of their return values
- Non-iterator functions will probably corrupt the encoder
-
- Example:
- encoder = luci.json.Encoder(encodableData)
- luci.ltn12.pump.all(encoder:source(), luci.ltn12.sink.file(io.open("someFile", w)))
-]]--
+-- Copyright 2008 Steven Barth <steven@midlink.org>
+-- Copyright 2008 Jo-Philipp Wich <jow@openwrt.org>
+-- Licensed to the public under the Apache License 2.0.
local nixio = require "nixio"
local util = require "luci.util"
local getmetatable = getmetatable
---- LuCI JSON-Library
--- @cstyle instance
module "luci.json"
---- Directly decode a JSON string
--- @param json JSON-String
--- @return Lua object
function decode(json, ...)
local a = ActiveDecoder(function() return nil end, ...)
a.chunk = json
end
---- Direcly encode a Lua object into a JSON string.
--- @param obj Lua Object
--- @return JSON string
function encode(obj, ...)
local out = {}
local e = Encoder(obj, 1, ...):source()
end
---- Null replacement function
--- @return null
function null()
return null
end
---- Create a new JSON-Encoder.
--- @class function
--- @name Encoder
--- @param data Lua-Object to be encoded.
--- @param buffersize Blocksize of returned data source.
--- @param fastescape Use non-standard escaping (don't escape control chars)
--- @return JSON-Encoder
Encoder = util.class()
function Encoder.__init__(self, data, buffersize, fastescape)
getmetatable(self).__call = Encoder.source
end
---- Create an LTN12 source providing the encoded JSON-Data.
--- @return LTN12 source
function Encoder.source(self)
local source = coroutine.create(self.dispatch)
return function()
local first = true
for key, entry in pairs(obj) do
- first = first or self:put(",")
- first = first and false
- self:parse_string(tostring(key))
- self:put(":")
- self:dispatch(entry)
+ if key ~= null then
+ first = first or self:put(",")
+ first = first and false
+ self:parse_string(tostring(key))
+ self:put(":")
+ self:dispatch(entry)
+ end
end
self:put("}")
}
---- Create a new JSON-Decoder.
--- @class function
--- @name Decoder
--- @param customnull Use luci.json.null instead of nil for decoding null
--- @return JSON-Decoder
Decoder = util.class()
function Decoder.__init__(self, customnull)
getmetatable(self).__call = Decoder.sink
end
---- Create an LTN12 sink from the decoder object which accepts the JSON-Data.
--- @return LTN12 sink
function Decoder.sink(self)
local sink = coroutine.create(self.dispatch)
return function(...)
end
---- Get the decoded data packets after the rawdata has been sent to the sink.
--- @return Decoded data
function Decoder.get(self)
return self.data
end
}
---- Create a new Active JSON-Decoder.
--- @class function
--- @name ActiveDecoder
--- @param customnull Use luci.json.null instead of nil for decoding null
--- @return Active JSON-Decoder
ActiveDecoder = util.class(Decoder)
function ActiveDecoder.__init__(self, source, customnull)
end
---- Fetches one JSON-object from given source
--- @return Decoded object
function ActiveDecoder.get(self)
local chunk, src_err, object
if not self.chunk then
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