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
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)))
]]--
+local nixio = require "nixio"
local util = require "luci.util"
local table = require "table"
local string = require "string"
local next = next
local pcall = pcall
+local band = nixio.bit.band
+local bor = nixio.bit.bor
+local rshift = nixio.bit.rshift
+local char = string.char
+
local getmetatable = getmetatable
--- LuCI JSON-Library
-- @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)
+-- @param fastescape Use non-standard escaping (don't escape control chars)
-- @return JSON-Encoder
Encoder = util.class()
self.buffersize = buffersize or 512
self.buffer = ""
self.fastescape = fastescape
-
+
getmetatable(self).__call = Encoder.source
end
else
return nil, data
end
- end
+ end
end
function Encoder.dispatch(self, data, start)
local parser = self.parsers[type(data)]
-
+
parser(self, data)
-
+
if start then
if #self.buffer > 0 then
coroutine.yield(self.buffer)
end
-
+
coroutine.yield()
end
end
coroutine.yield(self.buffer .. chunk:sub(written + 1, fbuffer))
written = fbuffer
-
+
while #chunk - written > self.buffersize do
fbuffer = written + self.buffersize
coroutine.yield(chunk:sub(written + 1, fbuffer))
written = fbuffer
- end
-
+ end
+
self.buffer = chunk:sub(written + 1)
else
self.buffer = self.buffer .. chunk
if type(obj) == "table" and (#obj == 0 and next(obj)) then
self:put("{")
local first = true
-
+
for key, entry in pairs(obj) do
first = first or self:put(",")
first = first and false
self:put(":")
self:dispatch(entry)
end
-
- self:put("}")
+
+ self:put("}")
else
self:put("[")
local first = true
-
+
if type(obj) == "table" then
for i=1, #obj do
first = first or self:put(",")
first = first or self:put(",")
first = first and nil
self:dispatch(entry)
- end
+ end
end
-
- self:put("]")
+
+ self:put("]")
end
end
['string'] = Encoder.parse_string,
['boolean'] = Encoder.parse_bool,
['function'] = Encoder.parse_iter
-}
+}
--- Create a new JSON-Decoder.
function Decoder.dispatch(self, chunk, src_err, strict)
local robject, object
local oset = false
-
+
while chunk do
while chunk and #chunk < 1 do
chunk = self:fetch()
end
-
+
assert(not strict or chunk, "Unexpected EOS")
if not chunk then break end
-
+
local char = chunk:sub(1, 1)
local parser = self.parsers[char]
or (char:match("%s") and self.parse_space)
or (char:match("[0-9-]") and self.parse_number)
or error("Unexpected char '%s'" % char)
-
+
chunk, robject = parser(self, chunk)
-
+
if parser ~= self.parse_space then
assert(not oset, "Scope violation: Too many objects")
object = robject
oset = true
-
+
if strict then
return chunk, object
end
end
end
-
+
assert(not src_err, src_err)
assert(oset, "Unexpected EOS")
-
+
self.data = object
end
assert(nchunk, "Unexpected EOS")
chunk = chunk .. nchunk
end
-
+
return chunk
end
function Decoder.parse_space(self, chunk)
local start = chunk:find("[^%s]")
-
+
while not start do
chunk = self:fetch()
if not chunk then
end
start = chunk:find("[^%s]")
end
-
+
return chunk:sub(start)
end
function Decoder.parse_literal(self, chunk, literal, value)
- chunk = self:fetch_atleast(chunk, #literal)
+ chunk = self:fetch_atleast(chunk, #literal)
assert(chunk:sub(1, #literal) == literal, "Invalid character sequence")
return chunk:sub(#literal + 1), value
end
local spos = chunk:find('[\\"]')
if spos then
str = str .. chunk:sub(1, spos - 1)
-
+
local char = chunk:sub(spos, spos)
if char == '"' then -- String end
chunk = chunk:sub(spos + 1)
else
str = str .. chunk
chunk = self:fetch()
- assert(chunk, "Unexpected EOS while parsing a string")
+ assert(chunk, "Unexpected EOS while parsing a string")
end
end
end
+function Decoder.utf8_encode(self, s1, s2)
+ local n = s1 * 256 + s2
+
+ if n >= 0 and n <= 0x7F then
+ return char(n)
+ elseif n >= 0 and n <= 0x7FF then
+ return char(
+ bor(band(rshift(n, 6), 0x1F), 0xC0),
+ bor(band(n, 0x3F), 0x80)
+ )
+ elseif n >= 0 and n <= 0xFFFF then
+ return char(
+ bor(band(rshift(n, 12), 0x0F), 0xE0),
+ bor(band(rshift(n, 6), 0x3F), 0x80),
+ bor(band(n, 0x3F), 0x80)
+ )
+ elseif n >= 0 and n <= 0x10FFFF then
+ return char(
+ bor(band(rshift(n, 18), 0x07), 0xF0),
+ bor(band(rshift(n, 12), 0x3F), 0x80),
+ bor(band(rshift(n, 6), 0x3F), 0x80),
+ bor(band(n, 0x3F), 0x80)
+ )
+ else
+ return "?"
+ end
+end
+
+
function Decoder.parse_escape(self, chunk)
local str = ""
chunk = self:fetch_atleast(chunk:sub(2), 1)
local char = chunk:sub(1, 1)
chunk = chunk:sub(2)
-
+
if char == '"' then
return chunk, '"'
elseif char == "\\" then
local s1, s2 = chunk:sub(1, 2), chunk:sub(3, 4)
s1, s2 = tonumber(s1, 16), tonumber(s2, 16)
assert(s1 and s2, "Invalid Unicode character")
-
- -- ToDo: Unicode support
- return chunk:sub(5), s1 == 0 and string.char(s2) or ""
+
+ return chunk:sub(5), self:utf8_encode(s1, s2)
elseif char == "/" then
return chunk, "/"
elseif char == "b" then
chunk = chunk:sub(2)
local array = {}
local nextp = 1
-
+
local chunk, object = self:parse_delimiter(chunk, "%]")
-
+
if object then
return chunk, array
end
-
+
repeat
chunk, object = self:dispatch(chunk, nil, true)
table.insert(array, nextp, object)
nextp = nextp + 1
-
+
chunk, object = self:parse_delimiter(chunk, ",%]")
assert(object, "Delimiter expected")
until object == "]"
repeat
chunk = self:parse_space(chunk)
assert(chunk, "Unexpected EOS")
-
+
chunk, name = self:parse_string(chunk)
-
+
chunk, object = self:parse_delimiter(chunk, ":")
assert(object, "Separator expected")
-
+
chunk, object = self:dispatch(chunk, nil, true)
array[name] = object
end
-Decoder.parsers = {
+Decoder.parsers = {
['"'] = Decoder.parse_string,
['t'] = Decoder.parse_true,
['f'] = Decoder.parse_false,
projects / project / luci.git / commitdiff