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-- Module options:
local always_try_using_lpeg = true
local register_global_module_table = false
local global_module_name = 'json'
David Kolf's JSON module for Lua 5.1/5.2
========================================
*Version 2.3*
In the default configuration this module writes no global values, not even
the module table. Import it using
    json = require ("dkjson")
In environments where `require` or a similiar function are not available
and you cannot receive the return value of the module, you can set the
option `register_global_module_table` to `true`.  The module table will
then be saved in the global variable with the name given by the option
`global_module_name`.
Exported functions and values:
`json.encode (object [, state])`
--------------------------------
Create a string representing the object. `Object` can be a table,
a string, a number, a boolean, `nil`, `json.null` or any object with
a function `__tojson` in its metatable. A table can only use strings
and numbers as keys and its values have to be valid objects as
well. It raises an error for any invalid data types or reference
`state` is an optional table with the following fields:
  - `indent`  
    When `indent` (a boolean) is set, the created string will contain
    newlines and indentations. Otherwise it will be one long line.
  - `keyorder`  
    `keyorder` is an array to specify the ordering of keys in the
    encoded output. If an object has keys which are not in this array
    they are written after the sorted keys.
  - `level`  
    This is the initial level of indentation used when `indent` is
    set. For each level two spaces are added. When absent it is set
  - `buffer`  
    `buffer` is an array to store the strings for the result so they
    can be concatenated at once. When it isn't given, the encode
    function will create it temporary and will return the
    concatenated result.
  - `bufferlen`  
    When `bufferlen` is set, it has to be the index of the last
    element of `buffer`.
  - `tables`  
    `tables` is a set to detect reference cycles. It is created
    temporary when absent. Every table that is currently processed
    is used as key, the value is `true`.
When `state.buffer` was set, the return value will be `true` on
success. Without `state.buffer` the return value will be a string.
`json.decode (string [, position [, null]])`
--------------------------------------------
Decode `string` starting at `position` or at 1 if `position` was
`null` is an optional value to be returned for null values. The
default is `nil`, but you could set it to `json.null` or any other
The return values are the object or `nil`, the position of the next
character that doesn't belong to the object, and in case of errors
an error message.
Two metatables are created. Every array or object that is decoded gets
a metatable with the `__jsontype` field set to either `array` or
`object`. If you want to provide your own metatables use the syntax
    json.decode (string, position, null, objectmeta, arraymeta)
To prevent the assigning of metatables pass `nil`:
    json.decode (string, position, null, nil)
`<metatable>.__jsonorder`
-------------------------
`__jsonorder` can overwrite the `keyorder` for a specific table.
`<metatable>.__jsontype`
------------------------
`__jsontype` can be either `"array"` or `"object"`. This value is only
checked for empty tables. (The default for empty tables is `"array"`).
`<metatable>.__tojson (self, state)`
------------------------------------
You can provide your own `__tojson` function in a metatable. In this
function you can either add directly to the buffer and return true,
or you can return a string. On errors nil and a message should be
`json.null`
-----------
You can use this value for setting explicit `null` values.
`json.version`
--------------
Set to `"dkjson 2.3"`.
`json.quotestring (string)`
---------------------------
Quote a UTF-8 string and escape critical characters using JSON
escape sequences. This function is only necessary when you build
your own `__tojson` functions.
`json.addnewline (state)`
-------------------------
When `state.indent` is set, add a newline to `state.buffer` and spaces
according to `state.level`.
LPeg support
------------
When the local configuration variable `always_try_using_lpeg` is set,
this module tries to load LPeg to replace the `decode` function. The
speed increase is significant. You can get the LPeg module at
  <http://www.inf.puc-rio.br/~roberto/lpeg/>.
When LPeg couldn't be loaded, the pure Lua functions stay active.
In case you don't want this module to require LPeg on its own,
disable the option `always_try_using_lpeg` in the options section at
the top of the module.
In this case you can later load LPeg support using
### `json.use_lpeg ()`
Require the LPeg module and replace the functions `quotestring` and
and `decode` with functions that use LPeg patterns.
This function returns the module table, so you can load the module
    json = require "dkjson".use_lpeg()
Alternatively you can use `pcall` so the JSON module still works when
LPeg isn't found.
    json = require "dkjson"
    pcall (json.use_lpeg)
### `json.using_lpeg`
This variable is set to `true` when LPeg was loaded successfully.
---------------------------------------------------------------------
You can contact the author by sending an e-mail to 'david' at the
domain 'dkolf.de'.
---------------------------------------------------------------------
*Copyright (C) 2010-2013 David Heiko Kolf*
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
<!-- This documentation can be parsed using Markdown to generate HTML.
     The source code is enclosed in a HTML comment so it won't be displayed
     by browsers, but it should be removed from the final HTML file as
     it isn't a valid HTML comment (and wastes space).
-- global dependencies:
local pairs, type, tostring, tonumber, getmetatable, setmetatable, rawset =
    pairs, type, tostring, tonumber, getmetatable, setmetatable, rawset
local error, require, pcall, select = error, require, pcall, select
local floor, huge = math.floor, math.huge
local strrep, gsub, strsub, strbyte, strchar, strfind, strlen, strformat =
    string.rep, string.gsub, string.sub, string.byte, string.char,
    string.find, string.len, string.format
local concat = table.concat
local json = { version = "dkjson 2.3" }
if register_global_module_table then
    _G[global_module_name] = json
local _ENV = nil -- blocking globals in Lua 5.2
pcall (function()
    -- Enable access to blocked metatables.
    -- Don't worry, this module doesn't change anything in them.
    local debmeta = require "debug".getmetatable
    if debmeta then getmetatable = debmeta end
json.null = setmetatable ({}, {
    __tojson = function () return "null" end
local function isarray (tbl)
    local max, n, arraylen = 0, 0, 0
    for k,v in pairs (tbl) do
        if k == 'n' and type(v) == 'number' then
            arraylen = v
            if v > max then
                max = v
        else
            if type(k) ~= 'number' or k < 1 or floor(k) ~= k then
                return false
            if k > max then
                max = k
        end
    if max > 10 and max > arraylen and max > n * 2 then
        return false -- don't create an array with too many holes
    return true, max
local escapecodes = {
    ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", ["\f"] = "\\f",
    ["\n"] = "\\n",  ["\r"] = "\\r",  ["\t"] = "\\t"
local function escapeutf8 (uchar)
    local value = escapecodes[uchar]
    if value then
        return value
    local a, b, c, d = strbyte (uchar, 1, 4)
    a, b, c, d = a or 0, b or 0, c or 0, d or 0
    if a <= 0x7f then
        value = a
    elseif 0xc0 <= a and a <= 0xdf and b >= 0x80 then
        value = (a - 0xc0) * 0x40 + b - 0x80
    elseif 0xe0 <= a and a <= 0xef and b >= 0x80 and c >= 0x80 then
        value = ((a - 0xe0) * 0x40 + b - 0x80) * 0x40 + c - 0x80
    elseif 0xf0 <= a and a <= 0xf7 and b >= 0x80 and c >= 0x80 and d >= 0x80 then
        value = (((a - 0xf0) * 0x40 + b - 0x80) * 0x40 + c - 0x80) * 0x40 + d - 0x80
        return ""
    if value <= 0xffff then
        return strformat ("\\u%.4x", value)
    elseif value <= 0x10ffff then
        -- encode as UTF-16 surrogate pair
        value = value - 0x10000
        local highsur, lowsur = 0xD800 + floor (value/0x400), 0xDC00 + (value % 0x400)
        return strformat ("\\u%.4x\\u%.4x", highsur, lowsur)
        return ""
local function fsub (str, pattern, repl)
    -- gsub always builds a new string in a buffer, even when no match
    -- exists. First using find should be more efficient when most strings
    -- don't contain the pattern.
    if strfind (str, pattern) then
        return gsub (str, pattern, repl)
        return str
local function quotestring (value)
    -- based on the regexp "escapable" in https://github.com/douglascrockford/JSON-js
    value = fsub (value, "[%z\1-\31\"\\\127]", escapeutf8)
    if strfind (value, "[\194\216\220\225\226\239]") then
        value = fsub (value, "\194[\128-\159\173]", escapeutf8)
        value = fsub (value, "\216[\128-\132]", escapeutf8)
        value = fsub (value, "\220\143", escapeutf8)
        value = fsub (value, "\225\158[\180\181]", escapeutf8)
        value = fsub (value, "\226\128[\140-\143\168-\175]", escapeutf8)
        value = fsub (value, "\226\129[\160-\175]", escapeutf8)
        value = fsub (value, "\239\187\191", escapeutf8)
        value = fsub (value, "\239\191[\176-\191]", escapeutf8)
    return "\"" .. value .. "\""
json.quotestring = quotestring
local function addnewline2 (level, buffer, buflen)
    buffer[buflen+1] = "\n"
    buffer[buflen+2] = strrep ("  ", level)
    buflen = buflen + 2
    return buflen
function json.addnewline (state)
    if state.indent then
        state.bufferlen = addnewline2 (state.level or 0,
            state.buffer, state.bufferlen or #(state.buffer))
local encode2 -- forward declaration
local function addpair (key, value, prev, indent, level, buffer, buflen, tables, globalorder)
    local kt = type (key)
    if kt ~= 'string' and kt ~= 'number' then
        return nil, "type '" .. kt .. "' is not supported as a key by JSON."
    if prev then
        buflen = buflen + 1
        buffer[buflen] = ","
    if indent then
        buflen = addnewline2 (level, buffer, buflen)
    buffer[buflen+1] = quotestring (key)
    buffer[buflen+2] = ":"
    return encode2 (value, indent, level, buffer, buflen + 2, tables, globalorder)
encode2 = function (value, indent, level, buffer, buflen, tables, globalorder)
    local valtype = type (value)
    local valmeta = getmetatable (value)
    valmeta = type (valmeta) == 'table' and valmeta -- only tables
    local valtojson = valmeta and valmeta.__tojson
    if valtojson then
        if tables[value] then
            return nil, "reference cycle"
        end
        tables[value] = true
        local state = {
            indent = indent, level = level, buffer = buffer,
            bufferlen = buflen, tables = tables, keyorder = globalorder
        local ret, msg = valtojson (value, state)
        if not ret then return nil, msg end
        tables[value] = nil
        buflen = state.bufferlen
        if type (ret) == 'string' then
            buflen = buflen + 1
            buffer[buflen] = ret
        end
    elseif value == nil then
        buflen = buflen + 1
        buffer[buflen] = "null"
    elseif valtype == 'number' then
        local s
        if value ~= value or value >= huge or -value >= huge then
            -- This is the behaviour of the original JSON implementation.
            s = "null"
        else
            s = tostring (value)
        end
        buflen = buflen + 1
        buffer[buflen] = s
    elseif valtype == 'boolean' then
        buflen = buflen + 1
        buffer[buflen] = value and "true" or "false"
    elseif valtype == 'string' then
        buflen = buflen + 1
        buffer[buflen] = quotestring (value)
    elseif valtype == 'table' then
        if tables[value] then
            return nil, "reference cycle"
        end
        tables[value] = true
        level = level + 1
        local isa, n = isarray (value)
        if n == 0 and valmeta and valmeta.__jsontype == 'object' then
            isa = false
        end
        local msg
        if isa then -- JSON array
            buflen = buflen + 1
            buffer[buflen] = "["
            for i = 1, n do
                buflen, msg = encode2 (value[i], indent, level, buffer, buflen, tables, globalorder)
                if not buflen then return nil, msg end
                if i < n then
                    buflen = buflen + 1
                    buffer[buflen] = ","
            buflen = buflen + 1
            buffer[buflen] = "]"
        else -- JSON object
            local prev = false
            buflen = buflen + 1
            buffer[buflen] = "{"
            local order = valmeta and valmeta.__jsonorder or globalorder
            if order then
                local used = {}
                n = #order
                for i = 1, n do
                    local k = order[i]
                    local v = value[k]
                    if v then
                        used[k] = true
                        buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
                        prev = true -- add a seperator before the next element
                for k,v in pairs (value) do
                    if not used[k] then
                        buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
                        if not buflen then return nil, msg end
                        prev = true -- add a seperator before the next element
            else -- unordered
                for k,v in pairs (value) do
                    buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
                    if not buflen then return nil, msg end
                    prev = true -- add a seperator before the next element
            if indent then
                buflen = addnewline2 (level - 1, buffer, buflen)
            buflen = buflen + 1
            buffer[buflen] = "}"
        end
        tables[value] = nil
        return nil, "type '" .. valtype .. "' is not supported by JSON."
    return buflen
function json.encode (value, state)
    state = state or {}
    local oldbuffer = state.buffer
    local buffer = oldbuffer or {}
    local ret, msg = encode2 (value, state.indent, state.level or 0,
        buffer, state.bufferlen or 0, state.tables or {}, state.keyorder)
    if not ret then
        error (msg, 2)
    elseif oldbuffer then
        state.bufferlen = ret
        return true
        return concat (buffer)
local function loc (str, where)
    local line, pos, linepos = 1, 1, 0
    while true do
        pos = strfind (str, "\n", pos, true)
        if pos and pos < where then
            line = line + 1
            linepos = pos
            pos = pos + 1
        else
            break
        end
    return "line " .. line .. ", column " .. (where - linepos)
local function unterminated (str, what, where)
    return nil, strlen (str) + 1, "unterminated " .. what .. " at " .. loc (str, where)
local function scanwhite (str, pos)
    while true do
        pos = strfind (str, "%S", pos)
        if not pos then return nil end
        if strsub (str, pos, pos + 2) == "\239\187\191" then
            -- UTF-8 Byte Order Mark
            pos = pos + 3
        else
            return pos
        end
local escapechars = {
    ["\""] = "\"", ["\\"] = "\\", ["/"] = "/", ["b"] = "\b", ["f"] = "\f",
    ["n"] = "\n", ["r"] = "\r", ["t"] = "\t"
local function unichar (value)
    if value < 0 then
        return nil
    elseif value <= 0x007f then
        return strchar (value)
    elseif value <= 0x07ff then
        return strchar (0xc0 + floor(value/0x40),
            0x80 + (floor(value) % 0x40))
    elseif value <= 0xffff then
        return strchar (0xe0 + floor(value/0x1000),
            0x80 + (floor(value/0x40) % 0x40),
            0x80 + (floor(value) % 0x40))
    elseif value <= 0x10ffff then
        return strchar (0xf0 + floor(value/0x40000),
            0x80 + (floor(value/0x1000) % 0x40),
            0x80 + (floor(value/0x40) % 0x40),
            0x80 + (floor(value) % 0x40))
        return nil
local function scanstring (str, pos)
    local lastpos = pos + 1
    local buffer, n = {}, 0
    while true do
        local nextpos = strfind (str, "[\"\\]", lastpos)
        if not nextpos then
            return unterminated (str, "string", pos)
        end
        if nextpos > lastpos then
            buffer[n] = strsub (str, lastpos, nextpos - 1)
        end
        if strsub (str, nextpos, nextpos) == "\"" then
            lastpos = nextpos + 1
            break
        else
            local escchar = strsub (str, nextpos + 1, nextpos + 1)
            local value
            if escchar == "u" then
                value = tonumber (strsub (str, nextpos + 2, nextpos + 5), 16)
                if value then
                    local value2
                    if 0xD800 <= value and value <= 0xDBff then
                        -- we have the high surrogate of UTF-16. Check if there is a
                        -- low surrogate escaped nearby to combine them.
                        if strsub (str, nextpos + 6, nextpos + 7) == "\\u" then
                            value2 = tonumber (strsub (str, nextpos + 8, nextpos + 11), 16)
                            if value2 and 0xDC00 <= value2 and value2 <= 0xDFFF then
                                value = (value - 0xD800)  * 0x400 + (value2 - 0xDC00) + 0x10000
                                value2 = nil -- in case it was out of range for a low surrogate
                    value = value and unichar (value)
                    if value then
                        if value2 then
                            lastpos = nextpos + 12
                            lastpos = nextpos + 6
            if not value then
                value = escapechars[escchar] or escchar
                lastpos = nextpos + 2
            buffer[n] = value
        end
    if n == 1 then
        return buffer[1], lastpos
    elseif n > 1 then
        return concat (buffer), lastpos
        return "", lastpos
local scanvalue -- forward declaration
local function scantable (what, closechar, str, startpos, nullval, objectmeta, arraymeta)
    local len = strlen (str)
    local tbl, n = {}, 0
    local pos = startpos + 1
    if what == 'object' then
        setmetatable (tbl, objectmeta)
        setmetatable (tbl, arraymeta)
    while true do
        pos = scanwhite (str, pos)
        if not pos then return unterminated (str, what, startpos) end
        local char = strsub (str, pos, pos)
        if char == closechar then
            return tbl, pos + 1
        end
        local val1, err
        val1, pos, err = scanvalue (str, pos, nullval, objectmeta, arraymeta)
        if err then return nil, pos, err end
        pos = scanwhite (str, pos)
        if not pos then return unterminated (str, what, startpos) end
        char = strsub (str, pos, pos)
        if char == ":" then
            if val1 == nil then
                return nil, pos, "cannot use nil as table index (at " .. loc (str, pos) .. ")"
            pos = scanwhite (str, pos + 1)
            if not pos then return unterminated (str, what, startpos) end
            local val2
            val2, pos, err = scanvalue (str, pos, nullval, objectmeta, arraymeta)
            if err then return nil, pos, err end
            tbl[val1] = val2
            pos = scanwhite (str, pos)
            if not pos then return unterminated (str, what, startpos) end
            char = strsub (str, pos, pos)
        else
            tbl[n] = val1
        end
        if char == "," then
            pos = pos + 1
        end
scanvalue = function (str, pos, nullval, objectmeta, arraymeta)
    pos = pos or 1
    pos = scanwhite (str, pos)
    if not pos then
        return nil, strlen (str) + 1, "no valid JSON value (reached the end)"
    local char = strsub (str, pos, pos)
    if char == "{" then
        return scantable ('object', "}", str, pos, nullval, objectmeta, arraymeta)
    elseif char == "[" then
        return scantable ('array', "]", str, pos, nullval, objectmeta, arraymeta)
    elseif char == "\"" then
        return scanstring (str, pos)
        local pstart, pend = strfind (str, "^%-?[%d%.]+[eE]?[%+%-]?%d*", pos)
        if pstart then
            local number = tonumber (strsub (str, pstart, pend))
            if number then
                return number, pend + 1
        end
        pstart, pend = strfind (str, "^%a%w*", pos)
        if pstart then
            local name = strsub (str, pstart, pend)
            if name == "true" then
                return true, pend + 1
            elseif name == "false" then
                return false, pend + 1
            elseif name == "null" then
                return nullval, pend + 1
        end
        return nil, pos, "no valid JSON value at " .. loc (str, pos)
local function optionalmetatables(...)
    if select("#", ...) > 0 then
        return ...
        return {__jsontype = 'object'}, {__jsontype = 'array'}
function json.decode (str, pos, nullval, ...)
    local objectmeta, arraymeta = optionalmetatables(...)
    return scanvalue (str, pos, nullval, objectmeta, arraymeta)
function json.use_lpeg ()
    local g = require ("lpeg")
    local pegmatch = g.match
    local P, S, R, V = g.P, g.S, g.R, g.V
    local function ErrorCall (str, pos, msg, state)
        if not state.msg then
            state.msg = msg .. " at " .. loc (str, pos)
            state.pos = pos
        end
        return false
    local function Err (msg)
        return g.Cmt (g.Cc (msg) * g.Carg (2), ErrorCall)
    local Space = (S" \n\r\t" + P"\239\187\191")^0
    local PlainChar = 1 - S"\"\\\n\r"
    local EscapeSequence = (P"\\" * g.C (S"\"\\/bfnrt" + Err "unsupported escape sequence")) / escapechars
    local HexDigit = R("09", "af", "AF")
    local function UTF16Surrogate (match, pos, high, low)
        high, low = tonumber (high, 16), tonumber (low, 16)
        if 0xD800 <= high and high <= 0xDBff and 0xDC00 <= low and low <= 0xDFFF then
            return true, unichar ((high - 0xD800)  * 0x400 + (low - 0xDC00) + 0x10000)
        else
            return false
        end
    local function UTF16BMP (hex)
        return unichar (tonumber (hex, 16))
    local U16Sequence = (P"\\u" * g.C (HexDigit * HexDigit * HexDigit * HexDigit))
    local UnicodeEscape = g.Cmt (U16Sequence * U16Sequence, UTF16Surrogate) + U16Sequence/UTF16BMP
    local Char = UnicodeEscape + EscapeSequence + PlainChar
    local String = P"\"" * g.Cs (Char ^ 0) * (P"\"" + Err "unterminated string")
    local Integer = P"-"^(-1) * (P"0" + (R"19" * R"09"^0))
    local Fractal = P"." * R"09"^0
    local Exponent = (S"eE") * (S"+-")^(-1) * R"09"^1
    local Number = (Integer * Fractal^(-1) * Exponent^(-1))/tonumber
    local Constant = P"true" * g.Cc (true) + P"false" * g.Cc (false) + P"null" * g.Carg (1)
    local SimpleValue = Number + String + Constant
    local ArrayContent, ObjectContent
    -- The functions parsearray and parseobject parse only a single value/pair
    -- at a time and store them directly to avoid hitting the LPeg limits.
    local function parsearray (str, pos, nullval, state)
        local obj, cont
        local npos
        local t, nt = {}, 0
        repeat
            obj, cont, npos = pegmatch (ArrayContent, str, pos, nullval, state)
            if not npos then break end
            pos = npos
            nt = nt + 1
            t[nt] = obj
        until cont == 'last'
        return pos, setmetatable (t, state.arraymeta)
    local function parseobject (str, pos, nullval, state)
        local obj, key, cont
        local npos
        local t = {}
        repeat
            key, obj, cont, npos = pegmatch (ObjectContent, str, pos, nullval, state)
            if not npos then break end
            pos = npos
            t[key] = obj
        until cont == 'last'
        return pos, setmetatable (t, state.objectmeta)
    local Array = P"[" * g.Cmt (g.Carg(1) * g.Carg(2), parsearray) * Space * (P"]" + Err "']' expected")
    local Object = P"{" * g.Cmt (g.Carg(1) * g.Carg(2), parseobject) * Space * (P"}" + Err "'}' expected")
    local Value = Space * (Array + Object + SimpleValue)
    local ExpectedValue = Value + Space * Err "value expected"
    ArrayContent = Value * Space * (P"," * g.Cc'cont' + g.Cc'last') * g.Cp()
    local Pair = g.Cg (Space * String * Space * (P":" + Err "colon expected") * ExpectedValue)
    ObjectContent = Pair * Space * (P"," * g.Cc'cont' + g.Cc'last') * g.Cp()
    local DecodeValue = ExpectedValue * g.Cp ()
    function json.decode (str, pos, nullval, ...)
        local state = {}
        state.objectmeta, state.arraymeta = optionalmetatables(...)
        local obj, retpos = pegmatch (DecodeValue, str, pos, nullval, state)
        if state.msg then
            return nil, state.pos, state.msg
        else
            return obj, retpos
        end
    -- use this function only once:
    json.use_lpeg = function () return json end
    json.using_lpeg = true
    return json -- so you can get the module using json = require "dkjson".use_lpeg()
if always_try_using_lpeg then
    pcall (json.use_lpeg)
return json
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