local _tl_compat; if (tonumber((_VERSION or ''):match('[%d.]*$')) or 0) < 5.3 then local p, m = pcall(require, 'compat53.module'); if p then _tl_compat = m end end; local math = _tl_compat and _tl_compat.math or math; local string = _tl_compat and _tl_compat.string or string; local table = _tl_compat and _tl_compat.table or table
local inspect = {Options = {}, }

inspect._VERSION = 'inspect.lua 3.1.0'
inspect._URL = 'http://github.com/kikito/inspect.lua'
inspect._DESCRIPTION = 'human-readable representations of tables'
inspect._LICENSE = [[
  MIT LICENSE

  Copyright (c) 2022 Enrique García Cota

  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]
inspect.KEY = setmetatable({}, { __tostring = function() return 'inspect.KEY' end })
inspect.METATABLE = setmetatable({}, { __tostring = function() return 'inspect.METATABLE' end })

local tostring = tostring
local rep = string.rep
local match = string.match
local char = string.char
local gsub = string.gsub
local fmt = string.format

local _rawget
if rawget then
	_rawget = rawget
else
	_rawget = function(t, k) return t[k] end
end

local function rawpairs(t)
	return next, t, nil
end



local function smartQuote(str)
	if match(str, '"') and not match(str, "'") then
		return "'" .. str .. "'"
	end
	return '"' .. gsub(str, '"', '\\"') .. '"'
end


local shortControlCharEscapes = {
	["\a"] = "\\a", ["\b"] = "\\b", ["\f"] = "\\f", ["\n"] = "\\n",
	["\r"] = "\\r", ["\t"] = "\\t", ["\v"] = "\\v", ["\127"] = "\\127",
}
local longControlCharEscapes = { ["\127"] = "\127" }
for i = 0, 31 do
	local ch = char(i)
	if not shortControlCharEscapes[ch] then
		shortControlCharEscapes[ch] = "\\" .. i
		longControlCharEscapes[ch] = fmt("\\%03d", i)
	end
end

local function escape(str)
	return (gsub(gsub(gsub(str, "\\", "\\\\"),
	"(%c)%f[0-9]", longControlCharEscapes),
	"%c", shortControlCharEscapes))
end

local luaKeywords = {
	['and'] = true,
	['break'] = true,
	['do'] = true,
	['else'] = true,
	['elseif'] = true,
	['end'] = true,
	['false'] = true,
	['for'] = true,
	['function'] = true,
	['goto'] = true,
	['if'] = true,
	['in'] = true,
	['local'] = true,
	['nil'] = true,
	['not'] = true,
	['or'] = true,
	['repeat'] = true,
	['return'] = true,
	['then'] = true,
	['true'] = true,
	['until'] = true,
	['while'] = true,
}

local function isIdentifier(str)
	return type(str) == "string" and
	not not str:match("^[_%a][_%a%d]*$") and
	not luaKeywords[str]
end

local flr = math.floor
local function isSequenceKey(k, sequenceLength)
	return type(k) == "number" and
	flr(k) == k and
	1 <= (k) and
	k <= sequenceLength
end

local defaultTypeOrders = {
	['number'] = 1, ['boolean'] = 2, ['string'] = 3, ['table'] = 4,
	['function'] = 5, ['userdata'] = 6, ['thread'] = 7,
}

local function sortKeys(a, b)
	local ta, tb = type(a), type(b)


	if ta == tb and (ta == 'string' or ta == 'number') then
		return (a) < (b)
	end

	local dta = defaultTypeOrders[ta] or 100
	local dtb = defaultTypeOrders[tb] or 100


	return dta == dtb and ta < tb or dta < dtb
end

local function getKeys(t)

	local seqLen = 1
	while _rawget(t, seqLen) ~= nil do
		seqLen = seqLen + 1
	end
	seqLen = seqLen - 1

	local keys, keysLen = {}, 0
	for k in rawpairs(t) do
		if not isSequenceKey(k, seqLen) then
			keysLen = keysLen + 1
			keys[keysLen] = k
		end
	end
	table.sort(keys, sortKeys)
	return keys, keysLen, seqLen
end

local function countCycles(x, cycles)
	if type(x) == "table" then
		if cycles[x] then
			cycles[x] = cycles[x] + 1
		else
			cycles[x] = 1
			for k, v in rawpairs(x) do
				countCycles(k, cycles)
				countCycles(v, cycles)
			end
			countCycles(getmetatable(x), cycles)
		end
	end
end

local function makePath(path, a, b)
	local newPath = {}
	local len = #path
	for i = 1, len do newPath[i] = path[i] end

	newPath[len + 1] = a
	newPath[len + 2] = b

	return newPath
end


local function processRecursive(process,
	item,
	path,
	visited)
	if item == nil then return nil end
	if visited[item] then return visited[item] end

	local processed = process(item, path)
	if type(processed) == "table" then
		local processedCopy = {}
		visited[item] = processedCopy
		local processedKey

		for k, v in rawpairs(processed) do
			processedKey = processRecursive(process, k, makePath(path, k, inspect.KEY), visited)
			if processedKey ~= nil then
				processedCopy[processedKey] = processRecursive(process, v, makePath(path, processedKey), visited)
			end
		end

		local mt = processRecursive(process, getmetatable(processed), makePath(path, inspect.METATABLE), visited)
		if type(mt) ~= 'table' then mt = nil end
		setmetatable(processedCopy, mt)
		processed = processedCopy
	end
	return processed
end

local function puts(buf, str)
	buf.n = buf.n + 1
	buf[buf.n] = str
end

local Inspector = {}

local Inspector_mt = { __index = Inspector }

local function tabify(inspector)
	puts(inspector.buf, inspector.newline .. rep(inspector.indent, inspector.level))
end

function Inspector:getId(v)
	local id = self.ids[v]
	local ids = self.ids
	if not id then
		local tv = type(v)
		id = (ids[tv] or 0) + 1
		ids[v], ids[tv] = id, id
	end
	return tostring(id)
end

function Inspector:putValue(v)
	local buf = self.buf
	local tv = type(v)
	if tv == 'string' then
		puts(buf, smartQuote(escape(v)))
	elseif tv == 'number' or tv == 'boolean' or tv == 'nil' or
		tv == 'cdata' or tv == 'ctype' then
		puts(buf, tostring(v))
	elseif tv == 'table' and not self.ids[v] then
		local t = v

		if t == inspect.KEY or t == inspect.METATABLE then
			puts(buf, tostring(t))
		elseif self.level >= self.depth then
			puts(buf, '{...}')
		else
			if self.cycles[t] > 1 then puts(buf, fmt('<%d>', self:getId(t))) end

			local keys, keysLen, seqLen = getKeys(t)

			puts(buf, '{')
			self.level = self.level + 1

			for i = 1, seqLen + keysLen do
				if i > 1 then puts(buf, ',') end
				if i <= seqLen then
					puts(buf, ' ')
					self:putValue(t[i])
				else
					local k = keys[i - seqLen]
					tabify(self)
					if isIdentifier(k) then
						puts(buf, k)
					else
						puts(buf, "[")
						self:putValue(k)
						puts(buf, "]")
					end
					puts(buf, ' = ')
					self:putValue(t[k])
				end
			end

			local mt = getmetatable(t)
			if type(mt) == 'table' then
				if seqLen + keysLen > 0 then puts(buf, ',') end
				tabify(self)
				puts(buf, '<metatable> = ')
				self:putValue(mt)
			end

			self.level = self.level - 1

			if keysLen > 0 or type(mt) == 'table' then
				tabify(self)
			elseif seqLen > 0 then
				puts(buf, ' ')
			end

			puts(buf, '}')
		end

	else
		puts(buf, fmt('<%s %d>', tv, self:getId(v)))
	end
end

function inspect.inspect(root, options)
	options = options or {}

	local depth = options.depth or (math.huge)
	local newline = options.newline or '\n'
	local indent = options.indent or '  '
	local process = options.process

	if process then
		root = processRecursive(process, root, {}, {})
	end

	local cycles = {}
	countCycles(root, cycles)

	local inspector = setmetatable({
		buf = { n = 0 },
		ids = {},
		cycles = cycles,
		depth = depth,
		level = 0,
		newline = newline,
		indent = indent,
	}, Inspector_mt)

	inspector:putValue(root)

	return table.concat(inspector.buf)
end

setmetatable(inspect, {
	__call = function(_, root, options)
		return inspect.inspect(root, options)
	end,
})

return inspect
