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| -- -*- 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 = '20211016.28' -- version history at end of file | |
| local AUTHOR_NOTE = "-[ JSON.lua package by Jeffrey Friedl (http://regex.info/blog/lua/json) version 20211016.28 ]-" | |
| -- | |
| -- 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.) | |
| -- | |
| -- | |
| -- DECODING AND STRICT PARSING | |
| -- | |
| -- If strictParsing is true in your JSON object, or if you set strictParsing as a decode option, | |
| -- some kinds of technically-invalid JSON that would normally be accepted are rejected with an error. | |
| -- | |
| -- For example, passing in an empty string | |
| -- | |
| -- JSON:decode("") | |
| -- | |
| -- normally succeeds with a return value of nil, but | |
| -- | |
| -- JSON:decode("", nil, { strictParsing = true }) | |
| -- | |
| -- results in an error being raised (onDecodeError is called). | |
| -- | |
| -- JSON.strictParsing = true | |
| -- JSON:decode("") | |
| -- | |
| -- achieves the same thing. | |
| -- | |
| -- | |
| -- | |
| -- 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 | |
| -- | |
| -- Some utf8 routines to deal with the fact that Lua handles only bytes | |
| -- | |
| local function top_three_bits(val) | |
| return math.floor(val / 0x20) | |
| end | |
| local function top_four_bits(val) | |
| return math.floor(val / 0x10) | |
| end | |
| local function unicode_character_bytecount_based_on_first_byte(first_byte) | |
| local W = string.byte(first_byte) | |
| if W < 0x80 then | |
| return 1 | |
| elseif (W == 0xC0) or (W == 0xC1) or (W >= 0x80 and W <= 0xBF) or (W >= 0xF5) then | |
| -- this is an error -- W can't be the start of a utf8 character | |
| return 0 | |
| elseif top_three_bits(W) == 0x06 then | |
| return 2 | |
| elseif top_four_bits(W) == 0x0E then | |
| return 3 | |
| else | |
| return 4 | |
| 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 backslash_escape_conversion = { | |
| ['"'] = '"', | |
| ['/'] = "/", | |
| ['\\'] = "\\", | |
| ['b'] = "\b", | |
| ['f'] = "\f", | |
| ['n'] = "\n", | |
| ['r'] = "\r", | |
| ['t'] = "\t", | |
| } | |
| 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 | |
| -- should grab the next bytes as per the number of bytes for this utf8 character | |
| local byte_count = unicode_character_bytecount_based_on_first_byte(c) | |
| local next_character | |
| if byte_count == 0 then | |
| self:onDecodeError("non-utf8 sequence", text, i, options.etc) | |
| elseif byte_count == 1 then | |
| if options.strictParsing and string.byte(c) < 0x20 then | |
| self:onDecodeError("Unescaped control character", text, i+1, options.etc) | |
| return nil, start -- in case the error method doesn't abort, return something sensible | |
| end | |
| next_character = c | |
| elseif byte_count == 2 then | |
| next_character = text:match('^(.[\128-\191])', i) | |
| elseif byte_count == 3 then | |
| next_character = text:match('^(.[\128-\191][\128-\191])', i) | |
| elseif byte_count == 4 then | |
| next_character = text:match('^(.[\128-\191][\128-\191][\128-\191])', i) | |
| end | |
| if not next_character then | |
| self:onDecodeError("incomplete utf8 sequence", text, i, options.etc) | |
| return nil, i -- in case the error method doesn't abort, return something sensible | |
| end | |
| VALUE = VALUE .. next_character | |
| i = i + byte_count | |
| else | |
| -- | |
| -- We have a backslash escape | |
| -- | |
| i = i + 1 | |
| local next_byte = text:match('^(.)', i) | |
| if next_byte == nil then | |
| -- string ended after the \ | |
| self:onDecodeError("unfinished \\ escape", text, i, options.etc) | |
| return nil, start -- in case the error method doesn't abort, return something sensible | |
| end | |
| if backslash_escape_conversion[next_byte] then | |
| VALUE = VALUE .. backslash_escape_conversion[next_byte] | |
| i = i + 1 | |
| else | |
| -- | |
| -- The only other valid use of \ that remains is in the form of \u#### | |
| -- | |
| local hex = text:match('^u([0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF][0123456789aAbBcCdDeEfF])', i) | |
| if hex then | |
| i = i + 5 -- 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) | |
| elseif options.strictParsing then | |
| --local next_byte = text:match('^\\(.)', i) printf("NEXT[%s]", next_byte); | |
| self:onDecodeError("illegal use of backslash escape", text, i, options.etc) | |
| return nil, start -- in case the error method doesn't abort, return something sensible | |
| else | |
| local byte_count = unicode_character_bytecount_based_on_first_byte(next_byte) | |
| if byte_count == 0 then | |
| self:onDecodeError("non-utf8 sequence after backslash escape", text, i, options.etc) | |
| return nil, start -- in case the error method doesn't abort, return something sensible | |
| end | |
| local next_character | |
| if byte_count == 1 then | |
| next_character = next_byte | |
| elseif byte_count == 2 then | |
| next_character = text:match('^(.[\128-\191])', i) | |
| elseif byte_count == 3 then | |
| next_character = text:match('^(.[\128-\191][\128-\191])', i) | |
| elseif byte_count == 3 then | |
| next_character = text:match('^(.[\128-\191][\128-\191][\128-\191])', i) | |
| end | |
| if next_character == nil then | |
| -- incomplete utf8 character after escape | |
| self:onDecodeError("incomplete utf8 sequence after backslash escape", text, i, options.etc) | |
| return nil, start -- in case the error method doesn't abort, return something sensible | |
| end | |
| VALUE = VALUE .. next_character | |
| i = i + byte_count | |
| end | |
| 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) -- [ https://datatracker.ietf.org/doc/html/rfc7158#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) | |
| 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 | |
| -- | |
| -- 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 | |
| if options.strictParsing == nil then | |
| options.strictParsing = self.strictParsing | |
| 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 passed an empty string.... | |
| if text:match('^%s*$') then | |
| if options.strictParsing then | |
| local error_message = "empty string 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 | |
| else | |
| -- we'll consider it nothing, but not an error | |
| return nil | |
| end | |
| 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 | |
| -- | |
| -- 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 '\\\\' | |
| 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 | |
| .. '/' -- class sub-pattern to match a forwardslash | |
| .. '%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: | |
| -- | |
| -- 20211016.28 Had forgotten to document the strictParsing option. | |
| -- | |
| -- 20211015.27 Better handle some edge-case errors [ thank you http://seriot.ch/projects/parsing_json.html ; all tests are now successful ] | |
| -- | |
| -- Added some semblance of proper UTF8 parsing, and now aborts with an error on ilformatted UTF8. | |
| -- | |
| -- Added the strictParsing option: | |
| -- Aborts with an error on unknown backslash-escape in strings | |
| -- Aborts on naked control characters in strings | |
| -- Aborts when decode is passed a whitespace-only string | |
| -- | |
| -- For completeness, when encoding a Lua string into a JSON string, escape a forward slash. | |
| -- | |
| -- String decoding should be a bit more efficient now. | |
| -- | |
| -- 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 <[email protected]>). | |
| -- | |
| -- 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 | |
| -- |
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| wrk -t4 -c100 -d30s -s script.lua 'http://localhost:8080/api' --latency |
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| JSON = (loadfile "JSON.lua")() | |
| wrk.scheme = "http" | |
| wrk.host = "localhost" | |
| wrk.port = 8080 | |
| wrk.method = "GET" | |
| wrk.headers["accept"] = "accept: application/json"; | |
| wrk.headers["authorization"] = "<bearer here>"; | |
| wrk.body = nil | |
| done = function(summary, latency, requests) | |
| t = { | |
| lat_min = latency.min, | |
| lat_max = latency.max, | |
| lat_mean = latency.mean, | |
| lat_stdev = latency.stdev, | |
| duration = summary.duration, | |
| requests = summary.requests, | |
| bytes = summary.bytes | |
| } | |
| if summary.errors then | |
| t["err_con"] = summary.errors.connect | |
| t["err_read"] = summary.errors.read | |
| t["err_write"] = summary.errors.write | |
| t["err_status"] = summary.errors.status | |
| t["err_timeout"] = summary.errors.timeout | |
| end | |
| filename = "stats.json" | |
| statsfile = assert(io.open(filename, "a")) | |
| statsfile.write(statsfile, JSON:encode(t) .. ",\n"); | |
| statsfile.close() | |
| end |
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| {"bytes":72448,"duration":5057581,"err_con":0,"err_read":0,"err_status":0,"err_timeout":4,"err_write":0,"lat_max":1267080,"lat_mean":1130435.25,"lat_min":795557,"lat_stdev":225308.26137742,"requests":8} |
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