67 lines
1.5 KiB
Lua
67 lines
1.5 KiB
Lua
--[[
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Licensed according to the included 'LICENSE' document
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Author: Thomas Harning Jr <harningt@gmail.com>
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]]
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local tostring = tostring
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local assert = assert
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local jsonutil = require("json.util")
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local type = type
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local _ENV = nil
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-- Shortcut that works
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local encodeBoolean = tostring
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local defaultOptions = {
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allowUndefined = true,
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null = jsonutil.null,
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undefined = jsonutil.undefined
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}
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local modeOptions = {}
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modeOptions.strict = {
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allowUndefined = false
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}
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local function mergeOptions(options, mode)
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jsonutil.doOptionMerge(options, false, 'others', defaultOptions, mode and modeOptions[mode])
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end
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local function getEncoder(options)
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options = options and jsonutil.merge({}, defaultOptions, options) or defaultOptions
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local function encodeOthers(value, state)
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if value == options.null then
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return 'null'
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elseif value == options.undefined then
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assert(options.allowUndefined, "Invalid value: Unsupported 'Undefined' parameter")
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return 'undefined'
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else
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return false
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end
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end
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local function encodeBoolean(value, state)
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return value and 'true' or 'false'
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end
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local nullType = type(options.null)
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local undefinedType = options.undefined and type(options.undefined)
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-- Make sure that all of the types handled here are handled
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local ret = {
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boolean = encodeBoolean,
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['nil'] = function() return 'null' end,
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[nullType] = encodeOthers
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}
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if undefinedType then
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ret[undefinedType] = encodeOthers
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end
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return ret
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end
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local others = {
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encodeBoolean = encodeBoolean,
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mergeOptions = mergeOptions,
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getEncoder = getEncoder
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}
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return others
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