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Diffstat (limited to 'mediawiki.lrdevplugin/JSON.lua')
| -rw-r--r-- | mediawiki.lrdevplugin/JSON.lua | 1053 |
1 files changed, 1053 insertions, 0 deletions
diff --git a/mediawiki.lrdevplugin/JSON.lua b/mediawiki.lrdevplugin/JSON.lua new file mode 100644 index 0000000..5f11425 --- /dev/null +++ b/mediawiki.lrdevplugin/JSON.lua @@ -0,0 +1,1053 @@ +-- -*- coding: utf-8 -*- +-- +-- Simple JSON encoding and decoding in pure Lua. +-- +-- Copyright 2010-2014 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 the copyright notice above, +-- the web-page links above, and the 'AUTHOR_NOTE' string below are +-- maintained. Enjoy. +-- +local VERSION = 20141223.14 -- version history at end of file +local AUTHOR_NOTE = "-[ JSON.lua package by Jeffrey Friedl (http://regex.info/blog/lua/json) version 20141223.14 ]-" + +-- +-- 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. +-- 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 +-- +-- 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 if known (and if a second '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 fourth '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 +-- +-- +-- +-- +-- +-- 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. +-- +-- The 'etc' in the error call is the second argument to encode() +-- and encode_pretty(), or nil if it wasn't provided. +-- +-- +-- PRETTY-PRINTING +-- +-- An optional third argument, a table of options, allows a bit of +-- configuration about how the encoding takes place: +-- +-- pretty = JSON:encode(val, etc, { +-- pretty = true, -- if false, no other options matter +-- indent = " ", -- this provides for a three-space indent per nesting level +-- align_keys = false, -- see below +-- }) +-- +-- encode() and encode_pretty() are identical except that encode_pretty() +-- provides a default options table if none given in the call: +-- +-- { pretty = true, align_keys = false, indent = " " } +-- +-- 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 three lines return identical results: +-- JSON:encode_pretty(data) +-- JSON:encode_pretty(data, nil, { pretty = true, align_keys = false, indent = " " }) +-- JSON:encode (data, nil, { pretty = true, align_keys = false, 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. +-- +-- +-- 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 +-- + + + + +-- +-- SUMMARY OF METHODS YOU CAN OVERRIDE IN YOUR LOCAL LUA JSON OBJECT +-- +-- assert +-- onDecodeError +-- onDecodeOfNilError +-- onDecodeOfHTMLError +-- onEncodeError +-- +-- 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, align_keys = false, indent = default_pretty_indent } + +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 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 char %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 + +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, etc) + -- + -- 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, etc) + 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 + local as_number = tonumber(full_number_text) + + if not as_number then + self:onDecodeError("bad number", text, start, etc) + end + + return as_number, i +end + + +local function grok_string(self, text, start, etc) + + if text:sub(start,start) ~= '"' then + self:onDecodeError("expected string's opening quote", text, start, etc) + 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, etc) +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, etc) + if text:sub(start,start) ~= '{' then + self:onDecodeError("expected '{'", text, start, etc) + 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, etc) + + i = skip_whitespace(text, new_i) + + if text:sub(i, i) ~= ':' then + self:onDecodeError("expected colon", text, i, etc) + end + + i = skip_whitespace(text, i + 1) + + local new_val, new_i = grok_one(self, text, i) + + 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, etc) + end + + i = skip_whitespace(text, i + 1) + end + + self:onDecodeError("unclosed '{'", text, start, etc) +end + +local function grok_array(self, text, start, etc) + if text:sub(start,start) ~= '[' then + self:onDecodeError("expected '['", text, start, etc) + 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) + + -- 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, etc) + end + i = skip_whitespace(text, i + 1) + end + self:onDecodeError("unclosed '['", text, start, etc) +end + + +grok_one = function(self, text, start, etc) + -- Skip any whitespace + start = skip_whitespace(text, start) + + if start > text:len() then + self:onDecodeError("unexpected end of string", text, nil, etc) + end + + if text:find('^"', start) then + return grok_string(self, text, start, etc) + + elseif text:find('^[-0123456789 ]', start) then + return grok_number(self, text, start, etc) + + elseif text:find('^%{', start) then + return grok_object(self, text, start, etc) + + elseif text:find('^%[', start) then + return grok_array(self, text, start, etc) + + 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 nil, start + 4 + + else + self:onDecodeError("can't parse JSON", text, start, etc) + end +end + +function OBJDEF:decode(text, etc) + if type(self) ~= 'table' or self.__index ~= OBJDEF then + OBJDEF:onDecodeError("JSON:decode must be called in method format", nil, nil, etc) + end + + if text == nil then + self:onDecodeOfNilError(string.format("nil passed to JSON:decode()"), nil, nil, etc) + elseif type(text) ~= 'string' then + self:onDecodeError(string.format("expected string argument to JSON:decode(), got %s", type(text)), nil, nil, etc) + end + + if text:match('^%s*$') then + return nil + end + + if text:match('^%s*<') then + -- Can't be JSON... we'll assume it's HTML + self:onDecodeOfHTMLError(string.format("html passed to JSON:decode()"), text, nil, etc) + 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 + self:onDecodeError("JSON package groks only UTF-8, sorry", text, nil, etc) + end + + local success, value = pcall(grok_one, self, text, 1, etc) + + if success then + return value + 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. + if self.assert then + self.assert(false, value) + else + assert(false, value) + end + -- and if we're still here, return a nil and throw the error message on as a second arg + return nil, value + 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 function json_string_literal(value) + local newval = value:gsub(chars_to_be_escaped_in_JSON_string, backslash_replacement_function) + 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 + 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 +-- +local encode_value -- must predeclare because it calls itself +function encode_value(self, value, parents, etc, options, indent) + + if value == nil then + return 'null' + + elseif type(value) == 'string' then + return json_string_literal(value) + + 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 + self:onEncodeError("can't convert " .. type(value) .. " to JSON", etc) + + 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 ITEMS = { } + for i = 1, maximum_number_key do + table.insert(ITEMS, encode_value(self, T[i], parents, etc, options, indent)) + end + + if 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) + 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) + 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 + + +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 + return encode_value(self, value, {}, etc, options or nil) +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 + return encode_value(self, value, {}, etc, options or default_pretty_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: +-- +-- 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 +-- |