commit 024b8de652432e2215ad561317c84ef6583d7de1 Author: neko259 Date: Tue Jan 15 22:32:03 2019 +0200 Initial commit diff --git a/JSON.lua b/JSON.lua new file mode 100644 index 0000000..4f89372 --- /dev/null +++ b/JSON.lua @@ -0,0 +1,1724 @@ +-- -*- coding: utf-8 -*- +-- +-- Simple JSON encoding and decoding in pure Lua. +-- +-- Copyright 2010-2017 Jeffrey Friedl +-- http://regex.info/blog/ +-- Latest version: http://regex.info/blog/lua/json +-- +-- This code is released under a Creative Commons CC-BY "Attribution" License: +-- http://creativecommons.org/licenses/by/3.0/deed.en_US +-- +-- It can be used for any purpose so long as: +-- 1) the copyright notice above is maintained +-- 2) the web-page links above are maintained +-- 3) the 'AUTHOR_NOTE' string below is maintained +-- +local VERSION = '20170927.26' -- version history at end of file +local AUTHOR_NOTE = "-[ JSON.lua package by Jeffrey Friedl (http://regex.info/blog/lua/json) version 20170927.26 ]-" + +-- +-- The 'AUTHOR_NOTE' variable exists so that information about the source +-- of the package is maintained even in compiled versions. It's also +-- included in OBJDEF below mostly to quiet warnings about unused variables. +-- +local OBJDEF = { + VERSION = VERSION, + AUTHOR_NOTE = AUTHOR_NOTE, +} + + +-- +-- Simple JSON encoding and decoding in pure Lua. +-- JSON definition: http://www.json.org/ +-- +-- +-- JSON = assert(loadfile "JSON.lua")() -- one-time load of the routines +-- +-- local lua_value = JSON:decode(raw_json_text) +-- +-- local raw_json_text = JSON:encode(lua_table_or_value) +-- local pretty_json_text = JSON:encode_pretty(lua_table_or_value) -- "pretty printed" version for human readability +-- +-- +-- +-- DECODING (from a JSON string to a Lua table) +-- +-- +-- JSON = assert(loadfile "JSON.lua")() -- one-time load of the routines +-- +-- local lua_value = JSON:decode(raw_json_text) +-- +-- If the JSON text is for an object or an array, e.g. +-- { "what": "books", "count": 3 } +-- or +-- [ "Larry", "Curly", "Moe" ] +-- +-- the result is a Lua table, e.g. +-- { what = "books", count = 3 } +-- or +-- { "Larry", "Curly", "Moe" } +-- +-- +-- The encode and decode routines accept an optional second argument, +-- "etc", which is not used during encoding or decoding, but upon error +-- is passed along to error handlers. It can be of any type (including nil). +-- +-- +-- +-- ERROR HANDLING DURING DECODE +-- +-- With most errors during decoding, this code calls +-- +-- JSON:onDecodeError(message, text, location, etc) +-- +-- with a message about the error, and if known, the JSON text being +-- parsed and the byte count where the problem was discovered. You can +-- replace the default JSON:onDecodeError() with your own function. +-- +-- The default onDecodeError() merely augments the message with data +-- about the text and the location (and, an 'etc' argument had been +-- provided to decode(), its value is tacked onto the message as well), +-- and then calls JSON.assert(), which itself defaults to Lua's built-in +-- assert(), and can also be overridden. +-- +-- For example, in an Adobe Lightroom plugin, you might use something like +-- +-- function JSON:onDecodeError(message, text, location, etc) +-- LrErrors.throwUserError("Internal Error: invalid JSON data") +-- end +-- +-- or even just +-- +-- function JSON.assert(message) +-- LrErrors.throwUserError("Internal Error: " .. message) +-- end +-- +-- If JSON:decode() is passed a nil, this is called instead: +-- +-- JSON:onDecodeOfNilError(message, nil, nil, etc) +-- +-- and if JSON:decode() is passed HTML instead of JSON, this is called: +-- +-- JSON:onDecodeOfHTMLError(message, text, nil, etc) +-- +-- The use of the 'etc' argument allows stronger coordination between +-- decoding and error reporting, especially when you provide your own +-- error-handling routines. Continuing with the the Adobe Lightroom +-- plugin example: +-- +-- function JSON:onDecodeError(message, text, location, etc) +-- local note = "Internal Error: invalid JSON data" +-- if type(etc) = 'table' and etc.photo then +-- note = note .. " while processing for " .. etc.photo:getFormattedMetadata('fileName') +-- end +-- LrErrors.throwUserError(note) +-- end +-- +-- : +-- : +-- +-- for i, photo in ipairs(photosToProcess) do +-- : +-- : +-- local data = JSON:decode(someJsonText, { photo = photo }) +-- : +-- : +-- end +-- +-- +-- +-- If the JSON text passed to decode() has trailing garbage (e.g. as with the JSON "[123]xyzzy"), +-- the method +-- +-- JSON:onTrailingGarbage(json_text, location, parsed_value, etc) +-- +-- is invoked, where: +-- +-- 'json_text' is the original JSON text being parsed, +-- 'location' is the count of bytes into 'json_text' where the garbage starts (6 in the example), +-- 'parsed_value' is the Lua result of what was successfully parsed ({123} in the example), +-- 'etc' is as above. +-- +-- If JSON:onTrailingGarbage() does not abort, it should return the value decode() should return, +-- or nil + an error message. +-- +-- local new_value, error_message = JSON:onTrailingGarbage() +-- +-- The default JSON:onTrailingGarbage() simply invokes JSON:onDecodeError("trailing garbage"...), +-- but you can have this package ignore trailing garbage via +-- +-- function JSON:onTrailingGarbage(json_text, location, parsed_value, etc) +-- return parsed_value +-- end +-- +-- +-- DECODING AND STRICT TYPES +-- +-- Because both JSON objects and JSON arrays are converted to Lua tables, +-- it's not normally possible to tell which original JSON type a +-- particular Lua table was derived from, or guarantee decode-encode +-- round-trip equivalency. +-- +-- However, if you enable strictTypes, e.g. +-- +-- JSON = assert(loadfile "JSON.lua")() --load the routines +-- JSON.strictTypes = true +-- +-- then the Lua table resulting from the decoding of a JSON object or +-- JSON array is marked via Lua metatable, so that when re-encoded with +-- JSON:encode() it ends up as the appropriate JSON type. +-- +-- (This is not the default because other routines may not work well with +-- tables that have a metatable set, for example, Lightroom API calls.) +-- +-- +-- ENCODING (from a lua table to a JSON string) +-- +-- JSON = assert(loadfile "JSON.lua")() -- one-time load of the routines +-- +-- local raw_json_text = JSON:encode(lua_table_or_value) +-- local pretty_json_text = JSON:encode_pretty(lua_table_or_value) -- "pretty printed" version for human readability +-- local custom_pretty = JSON:encode(lua_table_or_value, etc, { pretty = true, indent = "| ", align_keys = false }) +-- +-- On error during encoding, this code calls: +-- +-- JSON:onEncodeError(message, etc) +-- +-- which you can override in your local JSON object. Also see "HANDLING UNSUPPORTED VALUE TYPES" below. +-- +-- The 'etc' in the error call is the second argument to encode() and encode_pretty(), or nil if it wasn't provided. +-- +-- +-- +-- +-- ENCODING OPTIONS +-- +-- An optional third argument, a table of options, can be provided to encode(). +-- +-- encode_options = { +-- -- options for making "pretty" human-readable JSON (see "PRETTY-PRINTING" below) +-- pretty = true, -- turn pretty formatting on +-- indent = " ", -- use this indent for each level of an array/object +-- align_keys = false, -- if true, align the keys in a way that sounds like it should be nice, but is actually ugly +-- array_newline = false, -- if true, array elements become one to a line rather than inline +-- +-- -- other output-related options +-- null = "\0", -- see "ENCODING JSON NULL VALUES" below +-- stringsAreUtf8 = false, -- see "HANDLING UNICODE LINE AND PARAGRAPH SEPARATORS FOR JAVA" below +-- } +-- +-- json_string = JSON:encode(mytable, etc, encode_options) +-- +-- +-- +-- For reference, the defaults are: +-- +-- pretty = false +-- null = nil, +-- stringsAreUtf8 = false, +-- +-- +-- +-- PRETTY-PRINTING +-- +-- Enabling the 'pretty' encode option helps generate human-readable JSON. +-- +-- pretty = JSON:encode(val, etc, { +-- pretty = true, +-- indent = " ", +-- align_keys = false, +-- }) +-- +-- encode_pretty() is also provided: it's identical to encode() except +-- that encode_pretty() provides a default options table if none given in the call: +-- +-- { pretty = true, indent = " ", align_keys = false, array_newline = false } +-- +-- For example, if +-- +-- JSON:encode(data) +-- +-- produces: +-- +-- {"city":"Kyoto","climate":{"avg_temp":16,"humidity":"high","snowfall":"minimal"},"country":"Japan","wards":11} +-- +-- then +-- +-- JSON:encode_pretty(data) +-- +-- produces: +-- +-- { +-- "city": "Kyoto", +-- "climate": { +-- "avg_temp": 16, +-- "humidity": "high", +-- "snowfall": "minimal" +-- }, +-- "country": "Japan", +-- "wards": 11 +-- } +-- +-- The following lines all return identical strings: +-- JSON:encode_pretty(data) +-- JSON:encode_pretty(data, nil, { pretty = true, indent = " ", align_keys = false, array_newline = false}) +-- JSON:encode_pretty(data, nil, { pretty = true, indent = " " }) +-- JSON:encode (data, nil, { pretty = true, indent = " " }) +-- +-- An example of setting your own indent string: +-- +-- JSON:encode_pretty(data, nil, { pretty = true, indent = "| " }) +-- +-- produces: +-- +-- { +-- | "city": "Kyoto", +-- | "climate": { +-- | | "avg_temp": 16, +-- | | "humidity": "high", +-- | | "snowfall": "minimal" +-- | }, +-- | "country": "Japan", +-- | "wards": 11 +-- } +-- +-- An example of setting align_keys to true: +-- +-- JSON:encode_pretty(data, nil, { pretty = true, indent = " ", align_keys = true }) +-- +-- produces: +-- +-- { +-- "city": "Kyoto", +-- "climate": { +-- "avg_temp": 16, +-- "humidity": "high", +-- "snowfall": "minimal" +-- }, +-- "country": "Japan", +-- "wards": 11 +-- } +-- +-- which I must admit is kinda ugly, sorry. This was the default for +-- encode_pretty() prior to version 20141223.14. +-- +-- +-- HANDLING UNICODE LINE AND PARAGRAPH SEPARATORS FOR JAVA +-- +-- If the 'stringsAreUtf8' encode option is set to true, consider Lua strings not as a sequence of bytes, +-- but as a sequence of UTF-8 characters. +-- +-- Currently, the only practical effect of setting this option is that Unicode LINE and PARAGRAPH +-- separators, if found in a string, are encoded with a JSON escape instead of being dumped as is. +-- The JSON is valid either way, but encoding this way, apparently, allows the resulting JSON +-- to also be valid Java. +-- +-- AMBIGUOUS SITUATIONS DURING THE ENCODING +-- +-- During the encode, if a Lua table being encoded contains both string +-- and numeric keys, it fits neither JSON's idea of an object, nor its +-- idea of an array. To get around this, when any string key exists (or +-- when non-positive numeric keys exist), numeric keys are converted to +-- strings. +-- +-- For example, +-- JSON:encode({ "one", "two", "three", SOMESTRING = "some string" })) +-- produces the JSON object +-- {"1":"one","2":"two","3":"three","SOMESTRING":"some string"} +-- +-- To prohibit this conversion and instead make it an error condition, set +-- JSON.noKeyConversion = true +-- +-- +-- ENCODING JSON NULL VALUES +-- +-- Lua tables completely omit keys whose value is nil, so without special handling there's +-- no way to represent JSON object's null value in a Lua table. For example +-- JSON:encode({ username = "admin", password = nil }) +-- +-- produces: +-- +-- {"username":"admin"} +-- +-- In order to actually produce +-- +-- {"username":"admin", "password":null} +-- + +-- one can include a string value for a "null" field in the options table passed to encode().... +-- any Lua table entry with that value becomes null in the JSON output: +-- +-- JSON:encode({ username = "admin", password = "xyzzy" }, -- First arg is the Lua table to encode as JSON. +-- nil, -- Second arg is the 'etc' value, ignored here +-- { null = "xyzzy" }) -- Third arg is th options table +-- +-- produces: +-- +-- {"username":"admin", "password":null} +-- +-- Just be sure to use a string that is otherwise unlikely to appear in your data. +-- The string "\0" (a string with one null byte) may well be appropriate for many applications. +-- +-- The "null" options also applies to Lua tables that become JSON arrays. +-- JSON:encode({ "one", "two", nil, nil }) +-- +-- produces +-- +-- ["one","two"] +-- +-- while +-- +-- NullPlaceholder = "\0" +-- encode_options = { null = NullPlaceholder } +-- JSON:encode({ "one", "two", NullPlaceholder, NullPlaceholder}, nil, encode_options) +-- produces +-- +-- ["one","two",null,null] +-- +-- +-- +-- HANDLING LARGE AND/OR PRECISE NUMBERS +-- +-- +-- Without special handling, numbers in JSON can lose precision in Lua. +-- For example: +-- +-- T = JSON:decode('{ "small":12345, "big":12345678901234567890123456789, "precise":9876.67890123456789012345 }') +-- +-- print("small: ", type(T.small), T.small) +-- print("big: ", type(T.big), T.big) +-- print("precise: ", type(T.precise), T.precise) +-- +-- produces +-- +-- small: number 12345 +-- big: number 1.2345678901235e+28 +-- precise: number 9876.6789012346 +-- +-- Precision is lost with both 'big' and 'precise'. +-- +-- This package offers ways to try to handle this better (for some definitions of "better")... +-- +-- The most precise method is by setting the global: +-- +-- JSON.decodeNumbersAsObjects = true +-- +-- When this is set, numeric JSON data is encoded into Lua in a form that preserves the exact +-- JSON numeric presentation when re-encoded back out to JSON, or accessed in Lua as a string. +-- +-- This is done by encoding the numeric data with a Lua table/metatable that returns +-- the possibly-imprecise numeric form when accessed numerically, but the original precise +-- representation when accessed as a string. +-- +-- Consider the example above, with this option turned on: +-- +-- JSON.decodeNumbersAsObjects = true +-- +-- T = JSON:decode('{ "small":12345, "big":12345678901234567890123456789, "precise":9876.67890123456789012345 }') +-- +-- print("small: ", type(T.small), T.small) +-- print("big: ", type(T.big), T.big) +-- print("precise: ", type(T.precise), T.precise) +-- +-- This now produces: +-- +-- small: table 12345 +-- big: table 12345678901234567890123456789 +-- precise: table 9876.67890123456789012345 +-- +-- However, within Lua you can still use the values (e.g. T.precise in the example above) in numeric +-- contexts. In such cases you'll get the possibly-imprecise numeric version, but in string contexts +-- and when the data finds its way to this package's encode() function, the original full-precision +-- representation is used. +-- +-- You can force access to the string or numeric version via +-- JSON:forceString() +-- JSON:forceNumber() +-- For example, +-- local probably_okay = JSON:forceNumber(T.small) -- 'probably_okay' is a number +-- +-- Code the inspects the JSON-turned-Lua data using type() can run into troubles because what used to +-- be a number can now be a table (e.g. as the small/big/precise example above shows). Update these +-- situations to use JSON:isNumber(item), which returns nil if the item is neither a number nor one +-- of these number objects. If it is either, it returns the number itself. For completeness there's +-- also JSON:isString(item). +-- +-- If you want to try to avoid the hassles of this "number as an object" kludge for all but really +-- big numbers, you can set JSON.decodeNumbersAsObjects and then also set one or both of +-- JSON:decodeIntegerObjectificationLength +-- JSON:decodeDecimalObjectificationLength +-- They refer to the length of the part of the number before and after a decimal point. If they are +-- set and their part is at least that number of digits, objectification occurs. If both are set, +-- objectification occurs when either length is met. +-- +-- ----------------------- +-- +-- Even without using the JSON.decodeNumbersAsObjects option, you can encode numbers in your Lua +-- table that retain high precision upon encoding to JSON, by using the JSON:asNumber() function: +-- +-- T = { +-- imprecise = 123456789123456789.123456789123456789, +-- precise = JSON:asNumber("123456789123456789.123456789123456789") +-- } +-- +-- print(JSON:encode_pretty(T)) +-- +-- This produces: +-- +-- { +-- "precise": 123456789123456789.123456789123456789, +-- "imprecise": 1.2345678912346e+17 +-- } +-- +-- +-- ----------------------- +-- +-- A different way to handle big/precise JSON numbers is to have decode() merely return the exact +-- string representation of the number instead of the number itself. This approach might be useful +-- when the numbers are merely some kind of opaque object identifier and you want to work with them +-- in Lua as strings anyway. +-- +-- This approach is enabled by setting +-- +-- JSON.decodeIntegerStringificationLength = 10 +-- +-- The value is the number of digits (of the integer part of the number) at which to stringify numbers. +-- NOTE: this setting is ignored if JSON.decodeNumbersAsObjects is true, as that takes precedence. +-- +-- Consider our previous example with this option set to 10: +-- +-- JSON.decodeIntegerStringificationLength = 10 +-- +-- T = JSON:decode('{ "small":12345, "big":12345678901234567890123456789, "precise":9876.67890123456789012345 }') +-- +-- print("small: ", type(T.small), T.small) +-- print("big: ", type(T.big), T.big) +-- print("precise: ", type(T.precise), T.precise) +-- +-- This produces: +-- +-- small: number 12345 +-- big: string 12345678901234567890123456789 +-- precise: number 9876.6789012346 +-- +-- The long integer of the 'big' field is at least JSON.decodeIntegerStringificationLength digits +-- in length, so it's converted not to a Lua integer but to a Lua string. Using a value of 0 or 1 ensures +-- that all JSON numeric data becomes strings in Lua. +-- +-- Note that unlike +-- JSON.decodeNumbersAsObjects = true +-- this stringification is simple and unintelligent: the JSON number simply becomes a Lua string, and that's the end of it. +-- If the string is then converted back to JSON, it's still a string. After running the code above, adding +-- print(JSON:encode(T)) +-- produces +-- {"big":"12345678901234567890123456789","precise":9876.6789012346,"small":12345} +-- which is unlikely to be desired. +-- +-- There's a comparable option for the length of the decimal part of a number: +-- +-- JSON.decodeDecimalStringificationLength +-- +-- This can be used alone or in conjunction with +-- +-- JSON.decodeIntegerStringificationLength +-- +-- to trip stringification on precise numbers with at least JSON.decodeIntegerStringificationLength digits after +-- the decimal point. (Both are ignored if JSON.decodeNumbersAsObjects is true.) +-- +-- This example: +-- +-- JSON.decodeIntegerStringificationLength = 10 +-- JSON.decodeDecimalStringificationLength = 5 +-- +-- T = JSON:decode('{ "small":12345, "big":12345678901234567890123456789, "precise":9876.67890123456789012345 }') +-- +-- print("small: ", type(T.small), T.small) +-- print("big: ", type(T.big), T.big) +-- print("precise: ", type(T.precise), T.precise) +-- +-- produces: +-- +-- small: number 12345 +-- big: string 12345678901234567890123456789 +-- precise: string 9876.67890123456789012345 +-- +-- +-- HANDLING UNSUPPORTED VALUE TYPES +-- +-- Among the encoding errors that might be raised is an attempt to convert a table value that has a type +-- that this package hasn't accounted for: a function, userdata, or a thread. You can handle these types as table +-- values (but not as table keys) if you supply a JSON:unsupportedTypeEncoder() method along the lines of the +-- following example: +-- +-- function JSON:unsupportedTypeEncoder(value_of_unsupported_type) +-- if type(value_of_unsupported_type) == 'function' then +-- return "a function value" +-- else +-- return nil +-- end +-- end +-- +-- Your unsupportedTypeEncoder() method is actually called with a bunch of arguments: +-- +-- self:unsupportedTypeEncoder(value, parents, etc, options, indent, for_key) +-- +-- The 'value' is the function, thread, or userdata to be converted to JSON. +-- +-- The 'etc' and 'options' arguments are those passed to the original encode(). The other arguments are +-- probably of little interest; see the source code. (Note that 'for_key' is never true, as this function +-- is invoked only on table values; table keys of these types still trigger the onEncodeError method.) +-- +-- If your unsupportedTypeEncoder() method returns a string, it's inserted into the JSON as is. +-- If it returns nil plus an error message, that error message is passed through to an onEncodeError invocation. +-- If it returns only nil, processing falls through to a default onEncodeError invocation. +-- +-- If you want to handle everything in a simple way: +-- +-- function JSON:unsupportedTypeEncoder(value) +-- return tostring(value) +-- end +-- +-- +-- SUMMARY OF METHODS YOU CAN OVERRIDE IN YOUR LOCAL LUA JSON OBJECT +-- +-- assert +-- onDecodeError +-- onDecodeOfNilError +-- onDecodeOfHTMLError +-- onTrailingGarbage +-- onEncodeError +-- unsupportedTypeEncoder +-- +-- If you want to create a separate Lua JSON object with its own error handlers, +-- you can reload JSON.lua or use the :new() method. +-- +--------------------------------------------------------------------------- + +local default_pretty_indent = " " +local default_pretty_options = { pretty = true, indent = default_pretty_indent, align_keys = false, array_newline = false } + +local isArray = { __tostring = function() return "JSON array" end } isArray.__index = isArray +local isObject = { __tostring = function() return "JSON object" end } isObject.__index = isObject + +function OBJDEF:newArray(tbl) + return setmetatable(tbl or {}, isArray) +end + +function OBJDEF:newObject(tbl) + return setmetatable(tbl or {}, isObject) +end + + + + +local function getnum(op) + return type(op) == 'number' and op or op.N +end + +local isNumber = { + __tostring = function(T) return T.S end, + __unm = function(op) return getnum(op) end, + + __concat = function(op1, op2) return tostring(op1) .. tostring(op2) end, + __add = function(op1, op2) return getnum(op1) + getnum(op2) end, + __sub = function(op1, op2) return getnum(op1) - getnum(op2) end, + __mul = function(op1, op2) return getnum(op1) * getnum(op2) end, + __div = function(op1, op2) return getnum(op1) / getnum(op2) end, + __mod = function(op1, op2) return getnum(op1) % getnum(op2) end, + __pow = function(op1, op2) return getnum(op1) ^ getnum(op2) end, + __lt = function(op1, op2) return getnum(op1) < getnum(op2) end, + __eq = function(op1, op2) return getnum(op1) == getnum(op2) end, + __le = function(op1, op2) return getnum(op1) <= getnum(op2) end, +} +isNumber.__index = isNumber + +function OBJDEF:asNumber(item) + + if getmetatable(item) == isNumber then + -- it's already a JSON number object. + return item + elseif type(item) == 'table' and type(item.S) == 'string' and type(item.N) == 'number' then + -- it's a number-object table that lost its metatable, so give it one + return setmetatable(item, isNumber) + else + -- the normal situation... given a number or a string representation of a number.... + local holder = { + S = tostring(item), -- S is the representation of the number as a string, which remains precise + N = tonumber(item), -- N is the number as a Lua number. + } + return setmetatable(holder, isNumber) + end +end + +-- +-- Given an item that might be a normal string or number, or might be an 'isNumber' object defined above, +-- return the string version. This shouldn't be needed often because the 'isNumber' object should autoconvert +-- to a string in most cases, but it's here to allow it to be forced when needed. +-- +function OBJDEF:forceString(item) + if type(item) == 'table' and type(item.S) == 'string' then + return item.S + else + return tostring(item) + end +end + +-- +-- Given an item that might be a normal string or number, or might be an 'isNumber' object defined above, +-- return the numeric version. +-- +function OBJDEF:forceNumber(item) + if type(item) == 'table' and type(item.N) == 'number' then + return item.N + else + return tonumber(item) + end +end + +-- +-- If the given item is a number, return it. Otherwise, return nil. +-- This, this can be used both in a conditional and to access the number when you're not sure its form. +-- +function OBJDEF:isNumber(item) + if type(item) == 'number' then + return item + elseif type(item) == 'table' and type(item.N) == 'number' then + return item.N + else + return nil + end +end + +function OBJDEF:isString(item) + if type(item) == 'string' then + return item + elseif type(item) == 'table' and type(item.S) == 'string' then + return item.S + else + return nil + end +end + + +local function unicode_codepoint_as_utf8(codepoint) + -- + -- codepoint is a number + -- + if codepoint <= 127 then + return string.char(codepoint) + + elseif codepoint <= 2047 then + -- + -- 110yyyxx 10xxxxxx <-- useful notation from http://en.wikipedia.org/wiki/Utf8 + -- + local highpart = math.floor(codepoint / 0x40) + local lowpart = codepoint - (0x40 * highpart) + return string.char(0xC0 + highpart, + 0x80 + lowpart) + + elseif codepoint <= 65535 then + -- + -- 1110yyyy 10yyyyxx 10xxxxxx + -- + local highpart = math.floor(codepoint / 0x1000) + local remainder = codepoint - 0x1000 * highpart + local midpart = math.floor(remainder / 0x40) + local lowpart = remainder - 0x40 * midpart + + highpart = 0xE0 + highpart + midpart = 0x80 + midpart + lowpart = 0x80 + lowpart + + -- + -- Check for an invalid character (thanks Andy R. at Adobe). + -- See table 3.7, page 93, in http://www.unicode.org/versions/Unicode5.2.0/ch03.pdf#G28070 + -- + if ( highpart == 0xE0 and midpart < 0xA0 ) or + ( highpart == 0xED and midpart > 0x9F ) or + ( highpart == 0xF0 and midpart < 0x90 ) or + ( highpart == 0xF4 and midpart > 0x8F ) + then + return "?" + else + return string.char(highpart, + midpart, + lowpart) + end + + else + -- + -- 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx + -- + local highpart = math.floor(codepoint / 0x40000) + local remainder = codepoint - 0x40000 * highpart + local midA = math.floor(remainder / 0x1000) + remainder = remainder - 0x1000 * midA + local midB = math.floor(remainder / 0x40) + local lowpart = remainder - 0x40 * midB + + return string.char(0xF0 + highpart, + 0x80 + midA, + 0x80 + midB, + 0x80 + lowpart) + end +end + +function OBJDEF:onDecodeError(message, text, location, etc) + if text then + if location then + message = string.format("%s at byte %d of: %s", message, location, text) + else + message = string.format("%s: %s", message, text) + end + end + + if etc ~= nil then + message = message .. " (" .. OBJDEF:encode(etc) .. ")" + end + + if self.assert then + self.assert(false, message) + else + assert(false, message) + end +end + +function OBJDEF:onTrailingGarbage(json_text, location, parsed_value, etc) + return self:onDecodeError("trailing garbage", json_text, location, etc) +end + +OBJDEF.onDecodeOfNilError = OBJDEF.onDecodeError +OBJDEF.onDecodeOfHTMLError = OBJDEF.onDecodeError + +function OBJDEF:onEncodeError(message, etc) + if etc ~= nil then + message = message .. " (" .. OBJDEF:encode(etc) .. ")" + end + + if self.assert then + self.assert(false, message) + else + assert(false, message) + end +end + +local function grok_number(self, text, start, options) + -- + -- Grab the integer part + -- + local integer_part = text:match('^-?[1-9]%d*', start) + or text:match("^-?0", start) + + if not integer_part then + self:onDecodeError("expected number", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + local i = start + integer_part:len() + + -- + -- Grab an optional decimal part + -- + local decimal_part = text:match('^%.%d+', i) or "" + + i = i + decimal_part:len() + + -- + -- Grab an optional exponential part + -- + local exponent_part = text:match('^[eE][-+]?%d+', i) or "" + + i = i + exponent_part:len() + + local full_number_text = integer_part .. decimal_part .. exponent_part + + if options.decodeNumbersAsObjects then + + local objectify = false + + if not options.decodeIntegerObjectificationLength and not options.decodeDecimalObjectificationLength then + -- no options, so objectify + objectify = true + + elseif (options.decodeIntegerObjectificationLength + and + (integer_part:len() >= options.decodeIntegerObjectificationLength or exponent_part:len() > 0)) + + or + (options.decodeDecimalObjectificationLength + and + (decimal_part:len() >= options.decodeDecimalObjectificationLength or exponent_part:len() > 0)) + then + -- have options and they are triggered, so objectify + objectify = true + end + + if objectify then + return OBJDEF:asNumber(full_number_text), i + end + -- else, fall through to try to return as a straight-up number + + else + + -- Not always decoding numbers as objects, so perhaps encode as strings? + + -- + -- If we're told to stringify only under certain conditions, so do. + -- We punt a bit when there's an exponent by just stringifying no matter what. + -- I suppose we should really look to see whether the exponent is actually big enough one + -- way or the other to trip stringification, but I'll be lazy about it until someone asks. + -- + if (options.decodeIntegerStringificationLength + and + (integer_part:len() >= options.decodeIntegerStringificationLength or exponent_part:len() > 0)) + + or + + (options.decodeDecimalStringificationLength + and + (decimal_part:len() >= options.decodeDecimalStringificationLength or exponent_part:len() > 0)) + then + return full_number_text, i -- this returns the exact string representation seen in the original JSON + end + + end + + + local as_number = tonumber(full_number_text) + + if not as_number then + self:onDecodeError("bad number", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + return as_number, i +end + + +local function grok_string(self, text, start, options) + + if text:sub(start,start) ~= '"' then + self:onDecodeError("expected string's opening quote", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + local i = start + 1 -- +1 to bypass the initial quote + local text_len = text:len() + local VALUE = "" + while i <= text_len do + local c = text:sub(i,i) + if c == '"' then + return VALUE, i + 1 + end + if c ~= '\\' then + VALUE = VALUE .. c + i = i + 1 + elseif text:match('^\\b', i) then + VALUE = VALUE .. "\b" + i = i + 2 + elseif text:match('^\\f', i) then + VALUE = VALUE .. "\f" + i = i + 2 + elseif text:match('^\\n', i) then + VALUE = VALUE .. "\n" + i = i + 2 + elseif text:match('^\\r', i) then + VALUE = VALUE .. "\r" + i = i + 2 + elseif text:match('^\\t', i) then + VALUE = VALUE .. "\t" + i = i + 2 + else + local hex = text:match('^\\u([0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF])', i) + if hex then + i = i + 6 -- bypass what we just read + + -- We have a Unicode codepoint. It could be standalone, or if in the proper range and + -- followed by another in a specific range, it'll be a two-code surrogate pair. + local codepoint = tonumber(hex, 16) + if codepoint >= 0xD800 and codepoint <= 0xDBFF then + -- it's a hi surrogate... see whether we have a following low + local lo_surrogate = text:match('^\\u([dD][cdefCDEF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF])', i) + if lo_surrogate then + i = i + 6 -- bypass the low surrogate we just read + codepoint = 0x2400 + (codepoint - 0xD800) * 0x400 + tonumber(lo_surrogate, 16) + else + -- not a proper low, so we'll just leave the first codepoint as is and spit it out. + end + end + VALUE = VALUE .. unicode_codepoint_as_utf8(codepoint) + + else + + -- just pass through what's escaped + VALUE = VALUE .. text:match('^\\(.)', i) + i = i + 2 + end + end + end + + self:onDecodeError("unclosed string", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible +end + +local function skip_whitespace(text, start) + + local _, match_end = text:find("^[ \n\r\t]+", start) -- [http://www.ietf.org/rfc/rfc4627.txt] Section 2 + if match_end then + return match_end + 1 + else + return start + end +end + +local grok_one -- assigned later + +local function grok_object(self, text, start, options) + + if text:sub(start,start) ~= '{' then + self:onDecodeError("expected '{'", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + local i = skip_whitespace(text, start + 1) -- +1 to skip the '{' + + local VALUE = self.strictTypes and self:newObject { } or { } + + if text:sub(i,i) == '}' then + return VALUE, i + 1 + end + local text_len = text:len() + while i <= text_len do + local key, new_i = grok_string(self, text, i, options) + + i = skip_whitespace(text, new_i) + + if text:sub(i, i) ~= ':' then + self:onDecodeError("expected colon", text, i, options.etc) + return nil, i -- in case the error method doesn't abort, return something sensible + end + + i = skip_whitespace(text, i + 1) + + local new_val, new_i = grok_one(self, text, i, options) + + VALUE[key] = new_val + + -- + -- Expect now either '}' to end things, or a ',' to allow us to continue. + -- + i = skip_whitespace(text, new_i) + + local c = text:sub(i,i) + + if c == '}' then + return VALUE, i + 1 + end + + if text:sub(i, i) ~= ',' then + self:onDecodeError("expected comma or '}'", text, i, options.etc) + return nil, i -- in case the error method doesn't abort, return something sensible + end + + i = skip_whitespace(text, i + 1) + end + + self:onDecodeError("unclosed '{'", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible +end + +local function grok_array(self, text, start, options) + if text:sub(start,start) ~= '[' then + self:onDecodeError("expected '['", text, start, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + local i = skip_whitespace(text, start + 1) -- +1 to skip the '[' + local VALUE = self.strictTypes and self:newArray { } or { } + if text:sub(i,i) == ']' then + return VALUE, i + 1 + end + + local VALUE_INDEX = 1 + + local text_len = text:len() + while i <= text_len do + local val, new_i = grok_one(self, text, i, options) + + -- can't table.insert(VALUE, val) here because it's a no-op if val is nil + VALUE[VALUE_INDEX] = val + VALUE_INDEX = VALUE_INDEX + 1 + + i = skip_whitespace(text, new_i) + + -- + -- Expect now either ']' to end things, or a ',' to allow us to continue. + -- + local c = text:sub(i,i) + if c == ']' then + return VALUE, i + 1 + end + if text:sub(i, i) ~= ',' then + self:onDecodeError("expected comma or ']'", text, i, options.etc) + return nil, i -- in case the error method doesn't abort, return something sensible + end + i = skip_whitespace(text, i + 1) + end + self:onDecodeError("unclosed '['", text, start, options.etc) + return nil, i -- in case the error method doesn't abort, return something sensible +end + + +grok_one = function(self, text, start, options) + -- Skip any whitespace + start = skip_whitespace(text, start) + + if start > text:len() then + self:onDecodeError("unexpected end of string", text, nil, options.etc) + return nil, start -- in case the error method doesn't abort, return something sensible + end + + if text:find('^"', start) then + return grok_string(self, text, start, options.etc) + + elseif text:find('^[-0123456789 ]', start) then + return grok_number(self, text, start, options) + + elseif text:find('^%{', start) then + return grok_object(self, text, start, options) + + elseif text:find('^%[', start) then + return grok_array(self, text, start, options) + + elseif text:find('^true', start) then + return true, start + 4 + + elseif text:find('^false', start) then + return false, start + 5 + + elseif text:find('^null', start) then + return options.null, start + 4 + + else + self:onDecodeError("can't parse JSON", text, start, options.etc) + return nil, 1 -- in case the error method doesn't abort, return something sensible + end +end + +function OBJDEF:decode(text, etc, options) + -- + -- If the user didn't pass in a table of decode options, make an empty one. + -- + if type(options) ~= 'table' then + options = {} + end + + -- + -- If they passed in an 'etc' argument, stuff it into the options. + -- (If not, any 'etc' field in the options they passed in remains to be used) + -- + if etc ~= nil then + options.etc = etc + end + + + if type(self) ~= 'table' or self.__index ~= OBJDEF then + local error_message = "JSON:decode must be called in method format" + OBJDEF:onDecodeError(error_message, nil, nil, options.etc) + return nil, error_message -- in case the error method doesn't abort, return something sensible + end + + if text == nil then + local error_message = "nil passed to JSON:decode()" + self:onDecodeOfNilError(error_message, nil, nil, options.etc) + return nil, error_message -- in case the error method doesn't abort, return something sensible + + elseif type(text) ~= 'string' then + local error_message = "expected string argument to JSON:decode()" + self:onDecodeError(string.format("%s, got %s", error_message, type(text)), nil, nil, options.etc) + return nil, error_message -- in case the error method doesn't abort, return something sensible + end + + if text:match('^%s*$') then + -- an empty string is nothing, but not an error + return nil + end + + if text:match('^%s*<') then + -- Can't be JSON... we'll assume it's HTML + local error_message = "HTML passed to JSON:decode()" + self:onDecodeOfHTMLError(error_message, text, nil, options.etc) + return nil, error_message -- in case the error method doesn't abort, return something sensible + end + + -- + -- Ensure that it's not UTF-32 or UTF-16. + -- Those are perfectly valid encodings for JSON (as per RFC 4627 section 3), + -- but this package can't handle them. + -- + if text:sub(1,1):byte() == 0 or (text:len() >= 2 and text:sub(2,2):byte() == 0) then + local error_message = "JSON package groks only UTF-8, sorry" + self:onDecodeError(error_message, text, nil, options.etc) + return nil, error_message -- in case the error method doesn't abort, return something sensible + end + + -- + -- apply global options + -- + if options.decodeNumbersAsObjects == nil then + options.decodeNumbersAsObjects = self.decodeNumbersAsObjects + end + if options.decodeIntegerObjectificationLength == nil then + options.decodeIntegerObjectificationLength = self.decodeIntegerObjectificationLength + end + if options.decodeDecimalObjectificationLength == nil then + options.decodeDecimalObjectificationLength = self.decodeDecimalObjectificationLength + end + if options.decodeIntegerStringificationLength == nil then + options.decodeIntegerStringificationLength = self.decodeIntegerStringificationLength + end + if options.decodeDecimalStringificationLength == nil then + options.decodeDecimalStringificationLength = self.decodeDecimalStringificationLength + end + + + -- + -- Finally, go parse it + -- + local success, value, next_i = pcall(grok_one, self, text, 1, options) + + if success then + + local error_message = nil + if next_i ~= #text + 1 then + -- something's left over after we parsed the first thing.... whitespace is allowed. + next_i = skip_whitespace(text, next_i) + + -- if we have something left over now, it's trailing garbage + if next_i ~= #text + 1 then + value, error_message = self:onTrailingGarbage(text, next_i, value, options.etc) + end + end + return value, error_message + + else + + -- If JSON:onDecodeError() didn't abort out of the pcall, we'll have received + -- the error message here as "value", so pass it along as an assert. + local error_message = value + if self.assert then + self.assert(false, error_message) + else + assert(false, error_message) + end + -- ...and if we're still here (because the assert didn't throw an error), + -- return a nil and throw the error message on as a second arg + return nil, error_message + + end +end + +local function backslash_replacement_function(c) + if c == "\n" then + return "\\n" + elseif c == "\r" then + return "\\r" + elseif c == "\t" then + return "\\t" + elseif c == "\b" then + return "\\b" + elseif c == "\f" then + return "\\f" + elseif c == '"' then + return '\\"' + elseif c == '\\' then + return '\\\\' + else + return string.format("\\u%04x", c:byte()) + end +end + +local chars_to_be_escaped_in_JSON_string + = '[' + .. '"' -- class sub-pattern to match a double quote + .. '%\\' -- class sub-pattern to match a backslash + .. '%z' -- class sub-pattern to match a null + .. '\001' .. '-' .. '\031' -- class sub-pattern to match control characters + .. ']' + + +local LINE_SEPARATOR_as_utf8 = unicode_codepoint_as_utf8(0x2028) +local PARAGRAPH_SEPARATOR_as_utf8 = unicode_codepoint_as_utf8(0x2029) +local function json_string_literal(value, options) + local newval = value:gsub(chars_to_be_escaped_in_JSON_string, backslash_replacement_function) + if options.stringsAreUtf8 then + -- + -- This feels really ugly to just look into a string for the sequence of bytes that we know to be a particular utf8 character, + -- but utf8 was designed purposefully to make this kind of thing possible. Still, feels dirty. + -- I'd rather decode the byte stream into a character stream, but it's not technically needed so + -- not technically worth it. + -- + newval = newval:gsub(LINE_SEPARATOR_as_utf8, '\\u2028'):gsub(PARAGRAPH_SEPARATOR_as_utf8,'\\u2029') + end + return '"' .. newval .. '"' +end + +local function object_or_array(self, T, etc) + -- + -- We need to inspect all the keys... if there are any strings, we'll convert to a JSON + -- object. If there are only numbers, it's a JSON array. + -- + -- If we'll be converting to a JSON object, we'll want to sort the keys so that the + -- end result is deterministic. + -- + local string_keys = { } + local number_keys = { } + local number_keys_must_be_strings = false + local maximum_number_key + + for key in pairs(T) do + if type(key) == 'string' then + table.insert(string_keys, key) + elseif type(key) == 'number' then + table.insert(number_keys, key) + if key <= 0 or key >= math.huge then + number_keys_must_be_strings = true + elseif not maximum_number_key or key > maximum_number_key then + maximum_number_key = key + end + elseif type(key) == 'boolean' then + table.insert(string_keys, tostring(key)) + else + self:onEncodeError("can't encode table with a key of type " .. type(key), etc) + end + end + + if #string_keys == 0 and not number_keys_must_be_strings then + -- + -- An empty table, or a numeric-only array + -- + if #number_keys > 0 then + return nil, maximum_number_key -- an array + elseif tostring(T) == "JSON array" then + return nil + elseif tostring(T) == "JSON object" then + return { } + else + -- have to guess, so we'll pick array, since empty arrays are likely more common than empty objects + return nil + end + end + + table.sort(string_keys) + + local map + if #number_keys > 0 then + -- + -- If we're here then we have either mixed string/number keys, or numbers inappropriate for a JSON array + -- It's not ideal, but we'll turn the numbers into strings so that we can at least create a JSON object. + -- + + if self.noKeyConversion then + self:onEncodeError("a table with both numeric and string keys could be an object or array; aborting", etc) + end + + -- + -- Have to make a shallow copy of the source table so we can remap the numeric keys to be strings + -- + map = { } + for key, val in pairs(T) do + map[key] = val + end + + table.sort(number_keys) + + -- + -- Throw numeric keys in there as strings + -- + for _, number_key in ipairs(number_keys) do + local string_key = tostring(number_key) + if map[string_key] == nil then + table.insert(string_keys , string_key) + map[string_key] = T[number_key] + else + self:onEncodeError("conflict converting table with mixed-type keys into a JSON object: key " .. number_key .. " exists both as a string and a number.", etc) + end + end + end + + return string_keys, nil, map +end + +-- +-- Encode +-- +-- 'options' is nil, or a table with possible keys: +-- +-- pretty -- If true, return a pretty-printed version. +-- +-- indent -- A string (usually of spaces) used to indent each nested level. +-- +-- align_keys -- If true, align all the keys when formatting a table. The result is uglier than one might at first imagine. +-- Results are undefined if 'align_keys' is true but 'pretty' is not. +-- +-- array_newline -- If true, array elements are formatted each to their own line. The default is to all fall inline. +-- Results are undefined if 'array_newline' is true but 'pretty' is not. +-- +-- null -- If this exists with a string value, table elements with this value are output as JSON null. +-- +-- stringsAreUtf8 -- If true, consider Lua strings not as a sequence of bytes, but as a sequence of UTF-8 characters. +-- (Currently, the only practical effect of setting this option is that Unicode LINE and PARAGRAPH +-- separators, if found in a string, are encoded with a JSON escape instead of as raw UTF-8. +-- The JSON is valid either way, but encoding this way, apparently, allows the resulting JSON +-- to also be valid Java.) +-- +-- +local function encode_value(self, value, parents, etc, options, indent, for_key) + + -- + -- keys in a JSON object can never be null, so we don't even consider options.null when converting a key value + -- + if value == nil or (not for_key and options and options.null and value == options.null) then + return 'null' + + elseif type(value) == 'string' then + return json_string_literal(value, options) + + elseif type(value) == 'number' then + if value ~= value then + -- + -- NaN (Not a Number). + -- JSON has no NaN, so we have to fudge the best we can. This should really be a package option. + -- + return "null" + elseif value >= math.huge then + -- + -- Positive infinity. JSON has no INF, so we have to fudge the best we can. This should + -- really be a package option. Note: at least with some implementations, positive infinity + -- is both ">= math.huge" and "<= -math.huge", which makes no sense but that's how it is. + -- Negative infinity is properly "<= -math.huge". So, we must be sure to check the ">=" + -- case first. + -- + return "1e+9999" + elseif value <= -math.huge then + -- + -- Negative infinity. + -- JSON has no INF, so we have to fudge the best we can. This should really be a package option. + -- + return "-1e+9999" + else + return tostring(value) + end + + elseif type(value) == 'boolean' then + return tostring(value) + + elseif type(value) ~= 'table' then + + if self.unsupportedTypeEncoder then + local user_value, user_error = self:unsupportedTypeEncoder(value, parents, etc, options, indent, for_key) + -- If the user's handler returns a string, use that. If it returns nil plus an error message, bail with that. + -- If only nil returned, fall through to the default error handler. + if type(user_value) == 'string' then + return user_value + elseif user_value ~= nil then + self:onEncodeError("unsupportedTypeEncoder method returned a " .. type(user_value), etc) + elseif user_error then + self:onEncodeError(tostring(user_error), etc) + end + end + + self:onEncodeError("can't convert " .. type(value) .. " to JSON", etc) + + elseif getmetatable(value) == isNumber then + return tostring(value) + else + -- + -- A table to be converted to either a JSON object or array. + -- + local T = value + + if type(options) ~= 'table' then + options = {} + end + if type(indent) ~= 'string' then + indent = "" + end + + if parents[T] then + self:onEncodeError("table " .. tostring(T) .. " is a child of itself", etc) + else + parents[T] = true + end + + local result_value + + local object_keys, maximum_number_key, map = object_or_array(self, T, etc) + if maximum_number_key then + -- + -- An array... + -- + local key_indent + if options.array_newline then + key_indent = indent .. tostring(options.indent or "") + else + key_indent = indent + end + + local ITEMS = { } + for i = 1, maximum_number_key do + table.insert(ITEMS, encode_value(self, T[i], parents, etc, options, key_indent)) + end + + if options.array_newline then + result_value = "[\n" .. key_indent .. table.concat(ITEMS, ",\n" .. key_indent) .. "\n" .. indent .. "]" + elseif options.pretty then + result_value = "[ " .. table.concat(ITEMS, ", ") .. " ]" + else + result_value = "[" .. table.concat(ITEMS, ",") .. "]" + end + + elseif object_keys then + -- + -- An object + -- + local TT = map or T + + if options.pretty then + + local KEYS = { } + local max_key_length = 0 + for _, key in ipairs(object_keys) do + local encoded = encode_value(self, tostring(key), parents, etc, options, indent, true) + if options.align_keys then + max_key_length = math.max(max_key_length, #encoded) + end + table.insert(KEYS, encoded) + end + local key_indent = indent .. tostring(options.indent or "") + local subtable_indent = key_indent .. string.rep(" ", max_key_length) .. (options.align_keys and " " or "") + local FORMAT = "%s%" .. string.format("%d", max_key_length) .. "s: %s" + + local COMBINED_PARTS = { } + for i, key in ipairs(object_keys) do + local encoded_val = encode_value(self, TT[key], parents, etc, options, subtable_indent) + table.insert(COMBINED_PARTS, string.format(FORMAT, key_indent, KEYS[i], encoded_val)) + end + result_value = "{\n" .. table.concat(COMBINED_PARTS, ",\n") .. "\n" .. indent .. "}" + + else + + local PARTS = { } + for _, key in ipairs(object_keys) do + local encoded_val = encode_value(self, TT[key], parents, etc, options, indent) + local encoded_key = encode_value(self, tostring(key), parents, etc, options, indent, true) + table.insert(PARTS, string.format("%s:%s", encoded_key, encoded_val)) + end + result_value = "{" .. table.concat(PARTS, ",") .. "}" + + end + else + -- + -- An empty array/object... we'll treat it as an array, though it should really be an option + -- + result_value = "[]" + end + + parents[T] = false + return result_value + end +end + +local function top_level_encode(self, value, etc, options) + local val = encode_value(self, value, {}, etc, options) + if val == nil then + --PRIVATE("may need to revert to the previous public verison if I can't figure out what the guy wanted") + return val + else + return val + end +end + +function OBJDEF:encode(value, etc, options) + if type(self) ~= 'table' or self.__index ~= OBJDEF then + OBJDEF:onEncodeError("JSON:encode must be called in method format", etc) + end + + -- + -- If the user didn't pass in a table of decode options, make an empty one. + -- + if type(options) ~= 'table' then + options = {} + end + + return top_level_encode(self, value, etc, options) +end + +function OBJDEF:encode_pretty(value, etc, options) + if type(self) ~= 'table' or self.__index ~= OBJDEF then + OBJDEF:onEncodeError("JSON:encode_pretty must be called in method format", etc) + end + + -- + -- If the user didn't pass in a table of decode options, use the default pretty ones + -- + if type(options) ~= 'table' then + options = default_pretty_options + end + + return top_level_encode(self, value, etc, options) +end + +function OBJDEF.__tostring() + return "JSON encode/decode package" +end + +OBJDEF.__index = OBJDEF + +function OBJDEF:new(args) + local new = { } + + if args then + for key, val in pairs(args) do + new[key] = val + end + end + + return setmetatable(new, OBJDEF) +end + +return OBJDEF:new() + +-- +-- Version history: +-- +-- 20170927.26 Use option.null in decoding as well. Thanks to Max Sindwani for the bump, and sorry to Oliver Hitz +-- whose first mention of it four years ago was completely missed by me. +-- +-- 20170823.25 Added support for JSON:unsupportedTypeEncoder(). +-- Thanks to Chronos Phaenon Eosphoros (https://github.com/cpeosphoros) for the idea. +-- +-- 20170819.24 Added support for boolean keys in tables. +-- +-- 20170416.23 Added the "array_newline" formatting option suggested by yurenchen (http://www.yurenchen.com/) +-- +-- 20161128.22 Added: +-- JSON:isString() +-- JSON:isNumber() +-- JSON:decodeIntegerObjectificationLength +-- JSON:decodeDecimalObjectificationLength +-- +-- 20161109.21 Oops, had a small boo-boo in the previous update. +-- +-- 20161103.20 Used to silently ignore trailing garbage when decoding. Now fails via JSON:onTrailingGarbage() +-- http://seriot.ch/parsing_json.php +-- +-- Built-in error message about "expected comma or ']'" had mistakenly referred to '[' +-- +-- Updated the built-in error reporting to refer to bytes rather than characters. +-- +-- The decode() method no longer assumes that error handlers abort. +-- +-- Made the VERSION string a string instead of a number +-- + +-- 20160916.19 Fixed the isNumber.__index assignment (thanks to Jack Taylor) +-- +-- 20160730.18 Added JSON:forceString() and JSON:forceNumber() +-- +-- 20160728.17 Added concatenation to the metatable for JSON:asNumber() +-- +-- 20160709.16 Could crash if not passed an options table (thanks jarno heikkinen ). +-- +-- Made JSON:asNumber() a bit more resilient to being passed the results of itself. +-- +-- 20160526.15 Added the ability to easily encode null values in JSON, via the new "null" encoding option. +-- (Thanks to Adam B for bringing up the issue.) +-- +-- Added some support for very large numbers and precise floats via +-- JSON.decodeNumbersAsObjects +-- JSON.decodeIntegerStringificationLength +-- JSON.decodeDecimalStringificationLength +-- +-- Added the "stringsAreUtf8" encoding option. (Hat tip to http://lua-users.org/wiki/JsonModules ) +-- +-- 20141223.14 The encode_pretty() routine produced fine results for small datasets, but isn't really +-- appropriate for anything large, so with help from Alex Aulbach I've made the encode routines +-- more flexible, and changed the default encode_pretty() to be more generally useful. +-- +-- Added a third 'options' argument to the encode() and encode_pretty() routines, to control +-- how the encoding takes place. +-- +-- Updated docs to add assert() call to the loadfile() line, just as good practice so that +-- if there is a problem loading JSON.lua, the appropriate error message will percolate up. +-- +-- 20140920.13 Put back (in a way that doesn't cause warnings about unused variables) the author string, +-- so that the source of the package, and its version number, are visible in compiled copies. +-- +-- 20140911.12 Minor lua cleanup. +-- Fixed internal reference to 'JSON.noKeyConversion' to reference 'self' instead of 'JSON'. +-- (Thanks to SmugMug's David Parry for these.) +-- +-- 20140418.11 JSON nulls embedded within an array were being ignored, such that +-- ["1",null,null,null,null,null,"seven"], +-- would return +-- {1,"seven"} +-- It's now fixed to properly return +-- {1, nil, nil, nil, nil, nil, "seven"} +-- Thanks to "haddock" for catching the error. +-- +-- 20140116.10 The user's JSON.assert() wasn't always being used. Thanks to "blue" for the heads up. +-- +-- 20131118.9 Update for Lua 5.3... it seems that tostring(2/1) produces "2.0" instead of "2", +-- and this caused some problems. +-- +-- 20131031.8 Unified the code for encode() and encode_pretty(); they had been stupidly separate, +-- and had of course diverged (encode_pretty didn't get the fixes that encode got, so +-- sometimes produced incorrect results; thanks to Mattie for the heads up). +-- +-- Handle encoding tables with non-positive numeric keys (unlikely, but possible). +-- +-- If a table has both numeric and string keys, or its numeric keys are inappropriate +-- (such as being non-positive or infinite), the numeric keys are turned into +-- string keys appropriate for a JSON object. So, as before, +-- JSON:encode({ "one", "two", "three" }) +-- produces the array +-- ["one","two","three"] +-- but now something with mixed key types like +-- JSON:encode({ "one", "two", "three", SOMESTRING = "some string" })) +-- instead of throwing an error produces an object: +-- {"1":"one","2":"two","3":"three","SOMESTRING":"some string"} +-- +-- To maintain the prior throw-an-error semantics, set +-- JSON.noKeyConversion = true +-- +-- 20131004.7 Release under a Creative Commons CC-BY license, which I should have done from day one, sorry. +-- +-- 20130120.6 Comment update: added a link to the specific page on my blog where this code can +-- be found, so that folks who come across the code outside of my blog can find updates +-- more easily. +-- +-- 20111207.5 Added support for the 'etc' arguments, for better error reporting. +-- +-- 20110731.4 More feedback from David Kolf on how to make the tests for Nan/Infinity system independent. +-- +-- 20110730.3 Incorporated feedback from David Kolf at http://lua-users.org/wiki/JsonModules: +-- +-- * When encoding lua for JSON, Sparse numeric arrays are now handled by +-- spitting out full arrays, such that +-- JSON:encode({"one", "two", [10] = "ten"}) +-- returns +-- ["one","two",null,null,null,null,null,null,null,"ten"] +-- +-- In 20100810.2 and earlier, only up to the first non-null value would have been retained. +-- +-- * When encoding lua for JSON, numeric value NaN gets spit out as null, and infinity as "1+e9999". +-- Version 20100810.2 and earlier created invalid JSON in both cases. +-- +-- * Unicode surrogate pairs are now detected when decoding JSON. +-- +-- 20100810.2 added some checking to ensure that an invalid Unicode character couldn't leak in to the UTF-8 encoding +-- +-- 20100731.1 initial public release +-- diff --git a/depends.txt b/depends.txt new file mode 100644 index 0000000..4ad96d5 --- /dev/null +++ b/depends.txt @@ -0,0 +1 @@ +default diff --git a/init.lua b/init.lua new file mode 100644 index 0000000..2b4c3b3 --- /dev/null +++ b/init.lua @@ -0,0 +1,131 @@ +local current_mod_name = minetest.get_current_modname() +local modpath = minetest.get_modpath(current_mod_name) + +local telegram = {} + +local token = minetest.settings:get("telegram.token") +local chat_id = minetest.settings:get("telegram.chatid") + +local UPDATES_TIMEOUT = 1 -- seconds +local UPDATES_LIMIT = 10 + +local offset = 0 +local http_in_progress = false + +local ie, req_ie = _G, minetest.request_insecure_environment +if req_ie then ie = req_ie() end + +if not ie then + error("The mod requires access to insecure functions in order ".. + "to work. Please add the mod to your secure.trusted_mods ".. + "setting or disable the mod.") +end + +ie.package.path = ie.package.path + .. ";" .. modpath .. "/?.lua" + + +local JSON = ie.require("JSON") + +http_api = minetest.request_http_api() +if not http_api then + error("HTTP API cannot be enabled.") +end + +local function make_request(method, request_body, callback) + local response = {} + + local request = { + url = "https://api.telegram.org/bot" .. token .. "/" .. method, + timeout = 10, + post_data = request_body + } + + -- We can run request without callback, but minetest fails in this case + if not callback then + callback = function(response) + end + end + http_api.fetch(request, callback) +end + +local function process_updates(response) + if response.completed then + local updates = JSON:decode(response.data) + if updates then + if updates.result then + for key, update in pairs(updates.result) do + if update.message then + if update.message.text then + --print(update.message.text) + telegram.on_text_receive(update.message) + end + end + -- TODO Other types of messages + offset = update.update_id + 1 + end + end + end + end + + http_in_progress = false +end + +function telegram.send_message(chat_id, text) + local allowed_parse_mode = { + ["Markdown"] = true, + ["HTML"] = true + } + + if (not allowed_parse_mode[parse_mode]) then parse_mode = "" end + + local request_body = {} + + request_body.chat_id = chat_id + request_body.text = tostring(text) + request_body.parse_mode = parse_mode + request_body.reply_markup = "" + + make_request("sendMessage", request_body, nil) +end + +function telegram.on_text_receive(msg) + if msg.text == "/start" then + telegram.send_message(msg.from.id, "Hello there!\nMy name is " .. bot.first_name) + elseif msg.text == "ping" then + telegram.send_message(msg.chat.id, "Pong!") + elseif msg.text == "groupid" then + telegram.send_message(msg.chat.id, "Group id: " .. msg.chat.id) + else + minetest.chat_send_all("<" .. msg.from.first_name .. "@TG> " .. msg.text) + end +end + +local timer = 0 +minetest.register_globalstep(function(dtime) + timer = timer + dtime + if timer >= UPDATES_TIMEOUT and not http_in_progress then + local timeout = 0 + + print(offset) + local request_body = { + offset = offset, + limit = UPDATES_LIMIT, + timeout = timeout, + allowed_updates = nil + } + + http_in_progress = true + make_request("getUpdates", request_body, process_updates) + timer = 0 + end +end) + +-- Don't send messages from MT to telegram if we don't know where to +if chat_id then + minetest.register_on_chat_message(function(name, message) + telegram.send_message(chat_id, "<" .. name .. "@MT> " .. message) + return false + end) +end +