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diff --git a/web/dkjson.lua b/web/dkjson.lua new file mode 100644 index 0000000..987587b --- /dev/null +++ b/web/dkjson.lua @@ -0,0 +1,806 @@ + --[==[ + +David Kolf's JSON module for Lua 5.1/5.2 +======================================== + +*Version 2.1* + +This module writes no global values, not even the module table. +Import it using + + json = require ("dkjson") + +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 +cycles. + +`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 + to 0. + - `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 +omitted. + +`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 +value. + +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) + +`<metatable>.__jsonorder` +------------------------- + +`__jsonorder` can overwrite the `keyorder` for a specific table. + +`<metatable>.__jsontype` +------------------------ + +`__jsontype` can be either `"array"` or `"object"`. This is mainly useful +for tables that can be empty. (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 +returned. + +`json.null` +----------- + +You can use this value for setting explicit `null` values. + +`json.version` +-------------- + +Set to `"dkjson 2.1"`. + +`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 functions `quotestring` and `decode`. 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 this option: + + --]==] + local always_try_using_lpeg = true + --[==[ + +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 +using: + + 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 'kolf' at the +e-mail provider 'gmx.de'. + +--------------------------------------------------------------------- + +*Copyright (C) 2010, 2011 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 +SOFTWARE. + +<!-- 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 = error, require, pcall +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 + +if _VERSION == 'Lua 5.1' then + local function noglobals (s,k,v) error ("global access: " .. k, 2) end + setfenv (1, setmetatable ({}, { __index = noglobals, __newindex = noglobals })) +end +local _ENV = nil -- blocking globals in Lua 5.2 + +local json = { version = "dkjson 2.1" } + +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 +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 + end + else + if type(k) ~= 'number' or k < 1 or floor(k) ~= k then + return false + end + if k > max then + max = k + end + n = n + 1 + end + end + if max > 10 and max > arraylen and max > n * 2 then + return false -- don't create an array with too many holes + end + return true, max +end + +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 + end + 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 + else + return "" + end + 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) + else + return "" + end +end + +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) + else + return str + end +end + +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) + end + return "\"" .. value .. "\"" +end +json.quotestring = quotestring + +local function addnewline2 (level, buffer, buflen) + buffer[buflen+1] = "\n" + buffer[buflen+2] = strrep (" ", level) + buflen = buflen + 2 + return buflen +end + +function json.addnewline (state) + if state.indent then + state.bufferlen = addnewline2 (state.level or 0, + state.buffer, state.bufferlen or #(state.buffer)) + end +end + +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." + end + if prev then + buflen = buflen + 1 + buffer[buflen] = "," + end + if indent then + buflen = addnewline2 (level, buffer, buflen) + end + buffer[buflen+1] = quotestring (key) + buffer[buflen+2] = ":" + return encode2 (value, indent, level, buffer, buflen + 2, tables, globalorder) +end + +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 metatype = valmeta and valmeta.__jsontype + local isa, n + if metatype == 'array' then + isa = true + n = value.n or #value + elseif metatype == 'object' then + isa = false + else + isa, n = isarray (value) + 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] = "," + end + end + 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 + end + end + 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 + end + end + 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 + end + end + if indent then + buflen = addnewline2 (level - 1, buffer, buflen) + end + buflen = buflen + 1 + buffer[buflen] = "}" + end + tables[value] = nil + else + return nil, "type '" .. valtype .. "' is not supported by JSON." + end + return buflen +end + +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 + else + return concat (buffer) + end +end + +local function loc (str, where) + local line, pos, linepos = 1, 1, 1 + 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 + end + return "line " .. line .. ", column " .. (where - linepos) +end + +local function unterminated (str, what, where) + return nil, strlen (str) + 1, "unterminated " .. what .. " at " .. loc (str, where) +end + +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 + end +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)) + else + return nil + end +end + +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 + n = n + 1 + 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 + else + value2 = nil -- in case it was out of range for a low surrogate + end + end + end + value = value and unichar (value) + if value then + if value2 then + lastpos = nextpos + 12 + else + lastpos = nextpos + 6 + end + end + end + end + if not value then + value = escapechars[escchar] or escchar + lastpos = nextpos + 2 + end + n = n + 1 + buffer[n] = value + end + end + if n == 1 then + return buffer[1], lastpos + elseif n > 1 then + return concat (buffer), lastpos + else + return "", lastpos + end +end + +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) + else + setmetatable (tbl, arraymeta) + end + 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) .. ")" + end + 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 + n = n + 1 + tbl[n] = val1 + end + if char == "," then + pos = pos + 1 + end + end +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)" + 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) + else + 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 + 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 + end + return nil, pos, "no valid JSON value at " .. loc (str, pos) + end +end + +function json.decode (str, pos, nullval, objectmeta, arraymeta) + objectmeta = objectmeta or {__jsontype = 'object'} + arraymeta = arraymeta or {__jsontype = 'array'} + return scanvalue (str, pos, nullval, objectmeta, arraymeta) +end + +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 SpecialChars = (R"\0\31" + S"\"\\\127" + + P"\194" * (R"\128\159" + P"\173") + + P"\216" * R"\128\132" + + P"\220\132" + + P"\225\158" * S"\180\181" + + P"\226\128" * (R"\140\143" + S"\168\175") + + P"\226\129" * R"\160\175" + + P"\239\187\191" + + P"\229\191" + R"\176\191") / escapeutf8 + + local QuoteStr = g.Cs (g.Cc "\"" * (SpecialChars + 1)^0 * g.Cc "\"") + + quotestring = function (str) + return pegmatch (QuoteStr, str) + end + json.quotestring = quotestring + + 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 + end + + local function Err (msg) + return g.Cmt (g.Cc (msg) * g.Carg (2), ErrorCall) + end + + 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 + end + local function UTF16BMP (hex) + return unichar (tonumber (hex, 16)) + end + 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) + end + + 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) + end + + 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, objectmeta, arraymeta) + local state = { + objectmeta = objectmeta or {__jsontype = 'object'}, + arraymeta = arraymeta or {__jsontype = 'array'} + } + local obj, retpos = pegmatch (DecodeValue, str, pos, nullval, state) + if state.msg then + return nil, state.pos, state.msg + else + return obj, retpos + end + 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() +end + +if always_try_using_lpeg then + pcall (json.use_lpeg) +end + +return json + +--> |