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-rw-r--r--libs/json/luasrc/json.lua274
1 files changed, 225 insertions, 49 deletions
diff --git a/libs/json/luasrc/json.lua b/libs/json/luasrc/json.lua
index 0d38ed479..3d6a576a8 100644
--- a/libs/json/luasrc/json.lua
+++ b/libs/json/luasrc/json.lua
@@ -11,16 +11,49 @@ 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)))
]]--
local util = require "luci.util"
-local ltn12 = require "luci.ltn12"
local table = require "table"
+local string = require "string"
local coroutine = require "coroutine"
local assert = assert
local tonumber = tonumber
+local tostring = tostring
local error = error
+local type = type
+local pairs = pairs
+local ipairs = ipairs
+local next = next
+
+local getmetatable = getmetatable
module "luci.json"
@@ -30,9 +63,161 @@ function null()
return null
end
+
+Encoder = util.class()
+
+--- Creates a new Encoder.
+-- @param data Data to be encoded.
+-- @param buffersize Buffersize of returned data.
+-- @param fastescape Use non-standard escaping (don't escape control chars)
+function Encoder.__init__(self, data, buffersize, fastescape)
+ self.data = data
+ self.buffersize = buffersize or 512
+ self.buffer = ""
+ self.fastescape = fastescape
+
+ getmetatable(self).__call = Encoder.source
+end
+
+--- Create an LTN12 source from the encoder object
+-- @return LTN12 source
+function Encoder.source(self)
+ local source = coroutine.create(self.dispatch)
+ return function()
+ local res, data = coroutine.resume(source, self, self.data, true)
+ if res then
+ return data
+ else
+ return nil, data
+ 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
+
+function Encoder.put(self, chunk)
+ if self.buffersize < 2 then
+ corountine.yield(chunk)
+ else
+ if #self.buffer + #chunk > self.buffersize then
+ local written = 0
+ local fbuffer = self.buffersize - #self.buffer
+
+ 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
+
+ self.buffer = chunk:sub(written + 1)
+ else
+ self.buffer = self.buffer .. chunk
+ end
+ end
+end
+
+function Encoder.parse_nil(self)
+ self:put("null")
+end
+
+function Encoder.parse_bool(self, obj)
+ self:put(obj and "true" or "false")
+end
+
+function Encoder.parse_number(self, obj)
+ self:put(tostring(obj))
+end
+
+function Encoder.parse_string(self, obj)
+ if self.fastescape then
+ self:put('"' .. obj:gsub('\\', '\\\\'):gsub('"', '\\"') .. '"')
+ else
+ self:put('"' ..
+ obj:gsub('[%c\\"]',
+ function(char)
+ return '\\u00%02x' % char:byte()
+ end
+ )
+ .. '"')
+ end
+end
+
+function Encoder.parse_iter(self, obj)
+ if obj == null then
+ return self:put("null")
+ end
+
+ 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:parse_string(tostring(key))
+ self:put(":")
+ self:dispatch(entry)
+ end
+
+ self:put("}")
+ else
+ self:put("[")
+ local first = true
+
+ if type(obj) == "table" then
+ for i, entry in pairs(obj) do
+ first = first or self:put(",")
+ first = first and nil
+ self:dispatch(entry)
+ end
+ else
+ for entry in obj do
+ first = first or self:put(",")
+ first = first and nil
+ self:dispatch(entry)
+ end
+ end
+
+ self:put("]")
+ end
+end
+
+Encoder.parsers = {
+ ['nil'] = Encoder.parse_nil,
+ ['table'] = Encoder.parse_iter,
+ ['number'] = Encoder.parse_number,
+ ['string'] = Encoder.parse_string,
+ ['boolean'] = Encoder.parse_bool,
+ ['function'] = Encoder.parse_iter
+}
+
+
+
Decoder = util.class()
---- Create an LTN12 sink from the decoder object
+--- Create a new Decoder object.
+-- @param customnull User luci.json.null instead of nil
+function Decoder.__init__(self, customnull)
+ self.cnull = customnull
+ getmetatable(self).__call = Decoder.sink
+end
+
+--- Create an LTN12 sink from the decoder object.
-- @return LTN12 sink
function Decoder.sink(self)
local sink = coroutine.create(self.dispatch)
@@ -48,62 +233,41 @@ function Decoder.get(self)
return self.data
end
-
function Decoder.dispatch(self, chunk, src_err, strict)
local robject, object
+ local oset = false
while chunk do
- if #chunk < 1 then
+ while chunk and #chunk < 1 do
chunk = self:fetch()
end
assert(not strict or chunk, "Unexpected EOS")
- if not chunk then
- break
- end
+ if not chunk then break end
- local parser = nil
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)
- if char == '"' then
- parser = self.parse_string
- elseif char == 't' then
- parser = self.parse_true
- elseif char == 'f' then
- parser = self.parse_false
- elseif char == 'n' then
- parser = self.parse_null
- elseif char == '[' then
- parser = self.parse_array
- elseif char == '{' then
- parser = self.parse_object
- elseif char:match("%s") then
- parser = self.parse_space
- elseif char:match("[0-9-]") then
- parser = self.parse_number
- end
+ chunk, robject = parser(self, chunk)
- if parser then
- chunk, robject = parser(self, chunk)
-
- if robject ~= nil then
- assert(object == nil, "Scope violation: Too many objects")
- object = robject
- end
-
- if strict and object ~= nil then
+ 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
- else
- error("Unexpected char '%s'" % char)
end
end
assert(not src_err, src_err)
- assert(object ~= nil, "Unexpected EOS")
+ assert(oset, "Unexpected EOS")
self.data = object
- return chunk, object
end
@@ -162,7 +326,7 @@ end
function Decoder.parse_null(self, chunk)
- return self:parse_literal(chunk, "null", null)
+ return self:parse_literal(chunk, "null", self.cnull and null)
end
@@ -224,6 +388,14 @@ function Decoder.parse_escape(self, chunk)
return chunk, '"'
elseif char == "\\" then
return chunk, "\\"
+ elseif char == "u" then
+ chunk = self:fetch_atleast(chunk, 4)
+ 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 ""
elseif char == "/" then
return chunk, "/"
elseif char == "b" then
@@ -236,14 +408,6 @@ function Decoder.parse_escape(self, chunk)
return chunk, "\r"
elseif char == "t" then
return chunk, "\t"
- elseif char == "u" then
- chunk = self:fetch_atleast(chunk, 4)
- local s1, s2 = chunk:sub(1, 4):match("^([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])$")
- assert(s1 and s2, "Invalid Unicode character 'U+%s%s'" % {s1, s2})
- s1, s2 = tonumber(s1, 16), tonumber(s2, 16)
-
- -- ToDo: Unicode support
- return chunk:sub(5), s1 == 0 and s2 or ""
else
error("Unexpected escaping sequence '\\%s'" % char)
end
@@ -253,6 +417,7 @@ end
function Decoder.parse_array(self, chunk)
chunk = chunk:sub(2)
local array = {}
+ local nextp = 1
local chunk, object = self:parse_delimiter(chunk, "%]")
@@ -262,7 +427,8 @@ function Decoder.parse_array(self, chunk)
repeat
chunk, object = self:dispatch(chunk, nil, true)
- table.insert(array, object)
+ table.insert(array, nextp, object)
+ nextp = nextp + 1
chunk, object = self:parse_delimiter(chunk, ",%]")
assert(object, "Delimiter expected")
@@ -316,4 +482,14 @@ function Decoder.parse_delimiter(self, chunk, delimiter)
return chunk, nil
end
end
-end \ No newline at end of file
+end
+
+
+Decoder.parsers = {
+ ['"'] = Decoder.parse_string,
+ ['t'] = Decoder.parse_true,
+ ['f'] = Decoder.parse_false,
+ ['n'] = Decoder.parse_null,
+ ['['] = Decoder.parse_array,
+ ['{'] = Decoder.parse_object
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 05:20:11 +0000