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https://github.com/sbrl/Minetest-WorldEditAdditions.git
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axes_parser implemented (not added to init)
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VorTechnix
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commit
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2 changed files with 273 additions and 0 deletions
204
worldeditadditions/utils/parse/axes_parser.lua
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204
worldeditadditions/utils/parse/axes_parser.lua
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-- ██████ █████ ██████ ███████ ███████ █████ ██ ██ ███████ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██████ ███████ ██████ ███████ █████ ███████ ███ █████ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ██ ██ ██ ███████ ███████ ██ ██ ██ ██ ███████ ███████
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-- Error codes: https://kinsta.com/blog/http-status-codes/
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--- FOR TESTING ---
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local function unpack(tbl)
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if table.unpack then
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return table.unpack(tbl)
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else return unpack(tbl) end
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end
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---------------
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local Vector3
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if worldeditadditions then
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local wea = worldeditadditions
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Vector3 = dofile(wea.modpath.."/utils/vector3.lua")
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else
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Vector3 = require("worldeditadditions.utils.vector3")
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end
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local key_instance
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if worldeditadditions then
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local wea = worldeditadditions
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key_instance = dofile(wea.modpath.."/utils/parse/key_instance.lua")
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else
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key_instance = require("worldeditadditions.key_instance")
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end
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--- Unified Axis Keywords banks
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local keywords = {}
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-- Direction keywords
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keywords.dir = {
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["?"] = "front", f = "front",
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facing = "front", front = "front",
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b = "back", back = "back",
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behind = "back", rear = "back",
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l = "left", left = "left",
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r = "right", right = "right",
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u = "up", up = "up",
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d = "down", down = "down",
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}
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-- Mirroring keywords
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keywords.mirroring = {
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sym = true, symmetrical = true,
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mirror = true, mir = true,
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rev = true, reverse = true,
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["true"] = true
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}
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--- Initialize parser function container
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local parse = {}
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--- Processes an axis declaration into ordered xyz format. (Supports axis clumping)
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-- For example, "zzy" would become "yz"
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-- @param: str: String: Axis declaration to parse
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-- @returns: Table|Bool: axis | axes | false
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function parse.axes(str)
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local axes, ret = {"x","y","z"}, {}
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for i,v in ipairs(axes) do
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if str:match(v) then table.insert(ret,v) end
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end
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if #ret > 0 and str:match("^[xyz]+$") then
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return ret
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elseif str == "h" then
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return {"x", "z"}
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elseif str == "v" then
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return {"y"}
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else return false end
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end
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--- Processes an number from a string.
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-- @param: str: String: string to parse
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-- @returns: Number|Bool: processed number | false
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function parse.num(str)
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str = tostring(str) -- To prevent meltdown if str isn't a string
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local num = str:match("^-?%d+%.?%d*$")
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if num then
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return tonumber(num)
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else return false end
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end
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--- Checks if a string is a valid Unified Axis Keyword. (Supports axis clumping)
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-- @param: str: String: Keyword instance to parse
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-- @returns: Key Instance: returns keyword type, processed keyword content and signed number (or nil)
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function parse.keyword(str)
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if type(str) ~= "string" then
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return key_instance.new("err", "Error: \""..tostring(str).."\" is not a string.", 404)
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end
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local sign = 1
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if str:sub(1,1) == "-" then
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sign = -1
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str = str:sub(2)
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end
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local axes = parse.axes(str)
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if axes then
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return key_instance.new("axis", axes, sign)
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elseif keywords.dir[str] then
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return key_instance.new("dir", keywords.dir[str], sign)
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elseif keywords.mirroring[str] then
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return key_instance.new("rev", "mirroring")
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else return key_instance.new("err", "Error: \""..str.."\" is not a valid axis, direction or keyword.", 422)
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end
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end
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--- Creates a vector with a length of (@param: value * @param: sign)
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-- on each axis in @param: axes.
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-- @param: axes: Table: List of axes to set
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-- @param: value: Number: length of to set axes
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-- @param: sign: Number: sign multiplier for axes
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-- @returns: Vector3: processed vector
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function parse.vectorize(axes,value,sign)
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local ret = Vector3.new()
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for i,v in ipairs(axes) do
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ret[v] = value * sign
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end
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return ret
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end
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--- Converts Unified Axis Keyword table into Vector3 instances.
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-- @param: tbl: Table: Keyword table to parse
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-- @param: facing: Table: Output from worldeditadditions.player_dir(name)
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-- @param: sum: Bool: Return a single vector by summing the 2 output vectors together
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-- @returns: Vector3, [Vector3]: returns min, max Vector3s or sum Vector3 (if @param: sum ~= nil)
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-- if error: @returns: false, String: error message
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function parse.keytable(tbl, facing, sum)
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local min, max = Vector3.new(), Vector3.new()
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local expected, tmp = 1, {axes = {}, num = 0, sign = 1, mirror = false}
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function tmp:reset() self.axis, self.sign = "", 1 end
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for i,v in ipairs(tbl) do
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if v:sub(1,1) == "+" then v = v:sub(2) end
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tmp.num = parse.num(v)
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if expected == 1 then -- Mode 1 of state machine
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-- State machine expects string
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if tmp.num then
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-- If this is a number treat as all axes and add to appropriate vector
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if tmp.num * tmp.sign >= 0 then
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max = max:add(parse.vectorize({"x","y","z"}, tmp.num, tmp.sign))
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else
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min = min:add(parse.vectorize({"x","y","z"}, tmp.num, tmp.sign))
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end
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-- We are still looking for axes so the state machine should remain
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-- in Mode 1 for the next iteration
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else
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-- Else parse.keyword
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local key_inst = parse.keyword(v)
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-- Stop if error and return message
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if key_inst:is_error() then return false, key_inst.entry end
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-- Check key type and process further
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if key_inst.type == "axis" then
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tmp.axes = key_inst.entry
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elseif key_inst.type == "dir" then
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tmp.axes = {facing[key_inst.entry].axis}
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tmp.sign = facing[key_inst.entry].sign
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elseif key_inst.type == "rev" then
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tmp.mirror = true
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else
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-- If key type is error or unknown throw error and stop
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if key_inst.type == "err" then
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return false, key_inst.entry
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else
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return false, "Error: Unknown Key Instance type \""..
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tostring(key_inst.type).."\". Contact the devs!"
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end
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end
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expected = 2 -- Toggle state machine to expect number (Mode 2)
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end
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else -- Mode 2 of state machine
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-- State machine expects number
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if tmp.num then
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-- If this is a number process num and add to appropriate vector
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if tmp.num * tmp.sign >= 0 then
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max = max:add(parse.vectorize(tmp.axes, tmp.num, tmp.sign))
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else
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min = min:add(parse.vectorize(tmp.axes, tmp.num, tmp.sign))
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end
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expected = 1 -- Toggle state machine to expect string (Mode 1)
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else
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-- Else throw an error and stop everything
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return false, "Error: Expected number after \""..tostring(tbl[i-1])..
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"\", got \""..tostring(v).."\"."
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end
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end -- End of state machine
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end -- End of main for loop
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-- Handle Mirroring
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if tmp.mirror then
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max = max:max(min:abs())
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min = max:multiply(-1)
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end
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if sum then return min:add(max)
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else return min, max end
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end
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return parse
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69
worldeditadditions/utils/parse/key_instance.lua
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69
worldeditadditions/utils/parse/key_instance.lua
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@ -0,0 +1,69 @@
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--- A container for transmitting axis, sign pairs within parsing functions.
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-- @class
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local key_instance = {}
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key_instance.__index = key_instance
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key_instance.__name = "Key Instance"
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--- Creates a new Key Instance.
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-- @param: type: String: Key type (axis, direction, mirroring or error).
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-- @param: entry: String: The main content of the key.
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-- @param: sign: Int: The signed multiplier of the key (if any).
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-- @return: Key Instance: The new Key Instance.
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function key_instance.new(type,entry,sign)
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if type == "error" then type = "err" end
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local tbl = {type = type, entry = entry}
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if sign and sign ~= 0 then
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if type == "err" then tbl.code = sign
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else tbl.sign = sign end
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end
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return setmetatable(tbl, key_instance)
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end
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--- Checks if Key Instance "entry" field is a table.
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-- @param: tbl: Key Instance: The Key Instance to check.
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-- @return: Bool: Returns true if Key Instance has a non 0 sign value.
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function key_instance.entry_table(a)
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if type(a.entry) == "table" then
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return true
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else return false end
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end
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--- Checks if Key Instance has a signed multiplier.
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-- @param: tbl: Key Instance: The Key Instance to check.
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-- @return: Bool: Returns true if Key Instance has a non 0 sign value.
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function key_instance.has_sign(a)
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if not a.sign or a.sign == 0 then
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return false
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else return true end
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end
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--- Checks if Key Instance is an error.
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-- @param: tbl: Key Instance: The Key Instance to check.
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-- @return: Bool: Returns true if Key Instance is an error.
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function key_instance.is_error(a)
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if a.type == "err" then return true
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else return false end
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end
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function key_instance.__tostring(a)
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local function enquote(take)
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if type(take) == "string" then
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return '"'..take..'"'
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else return tostring(take) end
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end
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local ret = "{type = "..enquote(a.type)..", entry = "
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if type(a.entry) == "table" and #a.entry <= 3 then
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ret = ret.."{"
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for _i,v in ipairs(a.entry) do
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ret = ret..enquote(v)..", "
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end
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ret = ret:sub(1,-3).."}"
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else ret = ret..enquote(a.entry) end
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if a:is_error() and a.code then ret = ret..", code = "..a.code.."}"
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elseif a:has_sign() then ret = ret..", sign = "..a.sign.."}"
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else ret = ret.."}" end
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return ret
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end
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return key_instance
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