local l=require(script.Parent.Parent.Debug)local w={["\097\110\100"]=true,["\098\114\101\097\107"]=true;["\100\111"]=true,["\101\108\115\101"]=true;["\101\108\115\101\105\102"]=true,["\101\110\100"]=true;["\102\097\108\115\101"]=true,["\102\111\114"]=true,["\102\117\110\099\116\105\111\110"]=true;["\105\102"]=true,["\105\110"]=true,["\108\111\099\097\108"]=true;["\110\105\108"]=true;["\110\111\116"]=true;["\111\114"]=true,["\114\101\112\101\097\116"]=true;["\114\101\116\117\114\110"]=true;["\116\104\101\110"]=true;["\116\114\117\101"]=true,["\117\110\116\105\108"]=true,["\119\104\105\108\101"]=true}local function U(l)return l~=""and(w[l]==nil and string.find(l,"\094\091\095\037\097\093\043\091\095\037\119\093\043\036")~=nil)end local function b(l)return l==1 and"\105\115 "..l or"\097\114\101 "..l end local function o(l,w)return l==1 and w or w.."\115"end local function M(l,w,U)if type(w)~="\110\117\109\098\101\114"then l:WriteRaw(tostring(w))else local b=tostring(w)l:WriteRaw(string.rep("\048",U-#b)..b)end end local function C(l,w,U)w=tostring(w)l:WriteRaw(w..string.rep(" ",U-#w))end local function r(l,w)l:WriteRaw("\123")for U,b in next,w do l:Write("\091\123\058\063\125\093 \061 \123\058\063\125",U,b)if next(w,U)~=nil then l:WriteRaw("\044 ")end end l:WriteRaw("\125")end local function s(l,w)if next(w)==nil then return l:WriteRaw("\123\125")end;(l:WriteLineRaw("\123")):Indent()for U,b in next,w do l:Write("\091\123\058\063\125\093 \061 \123\058\035\063\125",U,b)if next(w,U)~=nil then l:WriteRaw("\044")end l:WriteLine("")end;(l:Unindent()):WriteRaw("\125")end local function E(w,U,b)local o=typeof(U)if o=="\115\116\114\105\110\103"then w:WriteRaw(string.format("\037\113",U))elseif o=="\116\097\098\108\101"then local l=getmetatable(U)if l~=nil and l.__FmtDebug~=nil then l.__FmtDebug(U,w,b)else(w:AddTable(U)):Lock()if b then s(w,U)else r(w,U)end w:Unlock()end elseif o=="\073\110\115\116\097\110\099\101"then w:WriteRaw(l.DirectoryToString(U))else w:WriteRaw(tostring(U))end end local function H(l,w,U)if type(w)~="\110\117\109\098\101\114"then l:WriteRaw(tostring(w))else l:WriteRaw(string.format("\037\046"..(U.."\102"),tostring(w)))end end local function e(l,w)if type(w)~="\110\117\109\098\101\114"then l:WriteRaw(tostring(w))else l:WriteRaw(w>=0 and"\043"..tostring(w)or tostring(w))end end local function J(l,w,r)local s=string.find(w,"\058")local J=string.sub(w,1,s and s-1 or-1)local v=s~=nil and string.sub(w,s+1 or-1)or nil local K=tonumber(J)local T=J==""local h if K~=nil then if K<0 or K%1~=0 then error("\073\110\118\097\108\105\100 \112\111\115\105\116\105\111\110\097\108 \112\097\114\097\109\101\116\101\114 \096"..(K.."\096\046"),4)end if K+1>#r.Arguments then error("\073\110\118\097\108\105\100 \112\111\115\105\116\105\111\110\097\108 \097\114\103\117\109\101\110\116 "..(K..(" \040\116\104\101\114\101 "..(b(#r.Arguments)..(" "..(o(#r.Arguments,"\097\114\103\117\109\101\110\116").."\041\046 \078\111\116\101\058 \080\111\115\105\116\105\111\110\097\108 \097\114\103\117\109\101\110\116\115 \097\114\101 \122\101\114\111-\098\097\115\101\100\046"))))),4)end r.BiggestPositionalParameter=math.max(r.BiggestPositionalParameter,K+1)h=r.Arguments[K+1]elseif T then local l=r.CurrentArgument+1 r.CurrentArgument=l h=r.Arguments[l]else if not U(J)then error("\073\110\118\097\108\105\100 \110\097\109\101\100 \112\097\114\097\109\101\116\101\114 \096"..(J.."\096\046"),4)end if r.NamedParameters==nil or r.NamedParameters[J]==nil then error("\084\104\101\114\101 \105\115 \110\111 \110\097\109\101\100 \097\114\103\117\109\101\110\116 \096"..(J.."\096\046"),4)end r.HadNamedParameter=true h=r.NamedParameters[J]end if v~=nil then local w=tonumber(v)local U=string.sub(v,1,1)local b=tonumber(string.sub(v,2))if v=="\063"then E(l,h,false)elseif v=="\035\063"then E(l,h,true)elseif v=="\043"then e(l,h)elseif U=="\046"and b~=nil then H(l,h,b)elseif U=="\048"and b~=nil then M(l,h,b)elseif w~=nil and w>0 then C(l,h,w)else error("\085\110\115\117\112\112\111\114\116\101\100 \102\111\114\109\097\116 \112\097\114\097\109\101\116\101\114 \096"..(v.."\096\046"),4)end else l:WriteRaw(tostring(h))end end local function v(l)local w=l[#l]return{Arguments=l;BiggestPositionalParameter=0;CurrentArgument=0,HadNamedParameter=false,NamedParameters=type(w)=="\116\097\098\108\101"and w or nil}end local function K(l,w,...)local U=1 local M=v({...})while U<=#w do local b=string.find(w,"\091\123\125\093",U)if b==nil then l:WriteRaw(string.sub(w,U))break end local o=string.sub(w,b,b)local C=string.sub(w,b+1,b+1)if C==o then l:WriteRaw(o)U=b+2 else if o=="\125"then error("\085\110\109\097\116\099\104\101\100 \'\125\'\046 \073\102 \121\111\117 \105\110\116\101\110\100\101\100 \116\111 \119\114\105\116\101 \'\125\'\044 \121\111\117 \099\097\110 \101\115\099\097\112\101 \105\116 \117\115\105\110\103 \'\125\125\'\046",3)else local o=string.find(w,"\125",U+1)if o==nil then error("\069\120\112\101\099\116\101\100 \097 \'\125\' \116\111 \099\108\111\115\101 \102\111\114\109\097\116 \115\112\101\099\105\102\105\101\114\046 \073\102 \121\111\117 \105\110\116\101\110\100\101\100 \116\111 \119\114\105\116\101 \'\123\'\044 \121\111\117 \099\097\110 \101\115\099\097\112\101 \105\116 \117\115\105\110\103 \'\123\123\'\046",3)else if b-U>0 then l:WriteRaw(string.sub(w,U,b-1))end local C=string.sub(w,b+1,o-1)J(l,C,M)U=o+1 end end end end local C=#M.Arguments local r=M.HadNamedParameter and C-1 or C if M.CurrentArgument>r then error(M.CurrentArgument..(" "..(o(M.CurrentArgument,"\112\097\114\097\109\101\116\101\114")..(" \102\111\117\110\100 \105\110 \116\101\109\112\108\097\116\101 \115\116\114\105\110\103\044 \098\117\116 \116\104\101\114\101 "..(b(r)..(" "..(o(r,"\097\114\103\117\109\101\110\116").."\046")))))),3)end if r>M.CurrentArgument and M.BiggestPositionalParameter<r then error(M.CurrentArgument..(" "..(o(M.CurrentArgument,"\112\097\114\097\109\101\116\101\114")..(" \102\111\117\110\100 \105\110 \116\101\109\112\108\097\116\101 \115\116\114\105\110\103\044 \098\117\116 \116\104\101\114\101 "..(b(r)..(" "..(o(r,"\097\114\103\117\109\101\110\116").."\046")))))),3)end end return K
local Debug = require(script.Parent.Parent.Debug)

local KEYWORDS = {
	["and"] = true;
	["break"] = true;
	["do"] = true;
	["else"] = true;
	["elseif"] = true;
	["end"] = true;
	["false"] = true;
	["for"] = true;
	["function"] = 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 IsValidVariable(Variable)
	return Variable ~= "" and KEYWORDS[Variable] == nil and string.find(Variable, "^[_%a]+[_%w]+$") ~= nil
end

local function Amountify(Amount)
	return Amount == 1 and "is " .. Amount or "are " .. Amount
end

local function Pluralize(Amount, String)
	return Amount == 1 and String or String .. "s"
end

local function LeadingZeros(Formatter, Argument, ArgumentLeadingZeros)
	if type(Argument) ~= "number" then
		Formatter:WriteRaw(tostring(Argument))
	else
		local StringArgument = tostring(Argument)
		Formatter:WriteRaw(string.rep("0", ArgumentLeadingZeros - #StringArgument) .. StringArgument)
	end
end

local function Width(Formatter, Argument, ArgumentWidth)
	Argument = tostring(Argument)
	Formatter:WriteRaw(Argument .. string.rep(" ", ArgumentWidth - #Argument))
end

local function DebugTable(Formatter, Table)
	Formatter:WriteRaw("{")

	for Key, Value in next, Table do
		Formatter:Write("[{:?}] = {:?}", Key, Value)

		if next(Table, Key) ~= nil then
			Formatter:WriteRaw(", ")
		end
	end

	Formatter:WriteRaw("}")
end

local function DebugTableExtended(Formatter, Table)
	-- Special case for empty tables.
	if next(Table) == nil then
		return Formatter:WriteRaw("{}")
	end

	Formatter:WriteLineRaw("{"):Indent()

	for Key, Value in next, Table do
		Formatter:Write("[{:?}] = {:#?}", Key, Value)
		if next(Table, Key) ~= nil then
			Formatter:WriteRaw(",")
		end

		Formatter:WriteLine("")
	end

	Formatter:Unindent():WriteRaw("}")
end

local function DebugImpl(Formatter, Argument, IsExtendedForm)
	local ArgumentType = typeof(Argument)

	if ArgumentType == "string" then
		Formatter:WriteRaw(string.format("%q", Argument))
	elseif ArgumentType == "table" then
		local ArgumentMetatable = getmetatable(Argument)

		if ArgumentMetatable ~= nil and ArgumentMetatable.__FmtDebug ~= nil then
			ArgumentMetatable.__FmtDebug(Argument, Formatter, IsExtendedForm)
		else
			Formatter:AddTable(Argument):Lock()

			if IsExtendedForm then
				DebugTableExtended(Formatter, Argument)
			else
				DebugTable(Formatter, Argument)
			end

			Formatter:Unlock()
		end
	elseif ArgumentType == "Instance" then
		Formatter:WriteRaw(Debug.DirectoryToString(Argument))
	else
		Formatter:WriteRaw(tostring(Argument))
	end
end

local function Precision(Formatter, Argument, ArgumentPrecision)
	if type(Argument) ~= "number" then
		Formatter:WriteRaw(tostring(Argument))
	else
		Formatter:WriteRaw(string.format("%." .. ArgumentPrecision .. "f", tostring(Argument)))
	end
end

local function Sign(Formatter, Argument)
	if type(Argument) ~= "number" then
		Formatter:WriteRaw(tostring(Argument))
	else
		Formatter:WriteRaw(Argument >= 0 and "+" .. tostring(Argument) or tostring(Argument))
	end
end

local function Interpolate(Formatter, Parameter, Writer)
	local FormatParameterStart = string.find(Parameter, ":")
	local LeftSide = string.sub(Parameter, 1, FormatParameterStart and FormatParameterStart - 1 or -1)
	local RightSide = FormatParameterStart ~= nil and string.sub(Parameter, FormatParameterStart + 1 or -1) or nil

	local PositionalParameter = tonumber(LeftSide)
	local IsRegularParameter = LeftSide == ""

	local Argument
	if PositionalParameter ~= nil then
		if PositionalParameter < 0 or PositionalParameter % 1 ~= 0 then
			error("Invalid positional parameter `" .. PositionalParameter .. "`.", 4)
		end

		if PositionalParameter + 1 > #Writer.Arguments then
			error("Invalid positional argument " .. PositionalParameter .. " (there " .. Amountify(#Writer.Arguments) .. " " .. Pluralize(#Writer.Arguments, "argument") .. "). Note: Positional arguments are zero-based.", 4)
		end

		Writer.BiggestPositionalParameter = math.max(Writer.BiggestPositionalParameter, PositionalParameter + 1)
		Argument = Writer.Arguments[PositionalParameter + 1]
	elseif IsRegularParameter then
		local CurrentArgument = Writer.CurrentArgument + 1
		Writer.CurrentArgument = CurrentArgument
		Argument = Writer.Arguments[CurrentArgument]
	else
		if not IsValidVariable(LeftSide) then
			error("Invalid named parameter `" .. LeftSide .. "`.", 4)
		end

		if Writer.NamedParameters == nil or Writer.NamedParameters[LeftSide] == nil then
			error("There is no named argument `" .. LeftSide .. "`.", 4)
		end

		Writer.HadNamedParameter = true
		Argument = Writer.NamedParameters[LeftSide]
	end

	if RightSide ~= nil then
		local Number = tonumber(RightSide)
		local FirstCharacter = string.sub(RightSide, 1, 1)
		local NumberAfterFirstCharacter = tonumber(string.sub(RightSide, 2))

		if RightSide == "?" then
			DebugImpl(Formatter, Argument, false)
		elseif RightSide == "#?" then
			DebugImpl(Formatter, Argument, true)
		elseif RightSide == "+" then
			Sign(Formatter, Argument)
		elseif FirstCharacter == "." and NumberAfterFirstCharacter ~= nil then
			Precision(Formatter, Argument, NumberAfterFirstCharacter)
		elseif FirstCharacter == "0" and NumberAfterFirstCharacter ~= nil then
			LeadingZeros(Formatter, Argument, NumberAfterFirstCharacter)
		elseif Number ~= nil and Number > 0 then
			Width(Formatter, Argument, Number)
		else
			error("Unsupported format parameter `" .. RightSide .. "`.", 4)
		end
	else
		Formatter:WriteRaw(tostring(Argument))
	end
end

local function ComposeWriter(Arguments)
	local LastArgument = Arguments[#Arguments]

	return {
		Arguments = Arguments;
		BiggestPositionalParameter = 0;
		CurrentArgument = 0;
		HadNamedParameter = false;
		NamedParameters = type(LastArgument) == "table" and LastArgument or nil;
	}
end

local function WriteFmt(Formatter, Template, ...)
	local Index = 1
	local Writer = ComposeWriter({...})

	while Index <= #Template do
		local Brace = string.find(Template, "[{}]", Index)

		-- There are no remaining braces in the string, so we can write the
		-- rest of the string to the formatter.
		if Brace == nil then
			Formatter:WriteRaw(string.sub(Template, Index))
			break
		end

		local BraceCharacter = string.sub(Template, Brace, Brace)
		local CharacterAfterBrace = string.sub(Template, Brace + 1, Brace + 1)

		if CharacterAfterBrace == BraceCharacter then
			-- This brace starts a literal '{', written as '{{'.

			Formatter:WriteRaw(BraceCharacter)
			Index = Brace + 2
		else
			if BraceCharacter == "}" then
				error("Unmatched '}'. If you intended to write '}', you can escape it using '}}'.", 3)
			else
				local CloseBrace = string.find(Template, "}", Index + 1)

				if CloseBrace == nil then
					error("Expected a '}' to close format specifier. If you intended to write '{', you can escape it using '{{'.", 3)
				else
					-- If there are any unwritten characters before this
					-- parameter, write them to the formatter.
					if Brace - Index > 0 then
						Formatter:WriteRaw(string.sub(Template, Index, Brace - 1))
					end

					local FormatSpecifier = string.sub(Template, Brace + 1, CloseBrace - 1)
					Interpolate(Formatter, FormatSpecifier, Writer)
					Index = CloseBrace + 1
				end
			end
		end
	end

	local Length = #Writer.Arguments
	local NumberOfArguments = Writer.HadNamedParameter and Length - 1 or Length

	if Writer.CurrentArgument > NumberOfArguments then
		error(Writer.CurrentArgument .. " " .. Pluralize(Writer.CurrentArgument, "parameter") .. " found in template string, but there " .. Amountify(NumberOfArguments) .. " " .. Pluralize(NumberOfArguments, "argument") .. ".", 3)
	end

	if NumberOfArguments > Writer.CurrentArgument and Writer.BiggestPositionalParameter < NumberOfArguments then
		error(Writer.CurrentArgument .. " " .. Pluralize(Writer.CurrentArgument, "parameter") .. " found in template string, but there " .. Amountify(NumberOfArguments) .. " " .. Pluralize(NumberOfArguments, "argument") .. ".", 3)
	end
end

return WriteFmt
