63 lines
1.6 KiB
Lua
63 lines
1.6 KiB
Lua
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--[[
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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 lpeg = require("lpeg")
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local jsonutil = require("json.util")
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local merge = jsonutil.merge
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local util = require("json.decode.util")
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-- Container module for other JavaScript types (bool, null, undefined)
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local _ENV = nil
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-- For null and undefined, use the util.null value to preserve null-ness
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local booleanCapture =
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lpeg.P("true") * lpeg.Cc(true)
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+ lpeg.P("false") * lpeg.Cc(false)
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local nullCapture = lpeg.P("null")
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local undefinedCapture = lpeg.P("undefined")
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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.simple = {
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null = false, -- Mapped to nil
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undefined = false -- Mapped to nil
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}
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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 generateLexer(options)
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-- The 'or nil' clause allows false to map to a nil value since 'nil' cannot be merged
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options = options.others
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local valueCapture = (
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booleanCapture
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+ nullCapture * lpeg.Cc(options.null or nil)
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)
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if options.allowUndefined then
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valueCapture = valueCapture + undefinedCapture * lpeg.Cc(options.undefined or nil)
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else
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valueCapture = valueCapture + #undefinedCapture * util.denied("undefined", "others.allowUndefined")
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end
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return valueCapture
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end
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local others = {
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mergeOptions = mergeOptions,
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generateLexer = generateLexer
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}
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return others
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