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-- Minetest: builtin/misc_helpers.lua
--------------------------------------------------------------------------------
-- Localize functions to avoid table lookups (better performance).
local string_sub, string_find = string.sub, string.find
--------------------------------------------------------------------------------
local function basic_dump(o)
local tp = type(o)
if tp == "number" then
return tostring(o)
elseif tp == "string" then
return string.format("%q", o)
elseif tp == "boolean" then
return tostring(o)
elseif tp == "nil" then
return "nil"
-- Uncomment for full function dumping support.
-- Not currently enabled because bytecode isn't very human-readable and
-- dump's output is intended for humans.
--elseif tp == "function" then
-- return string.format("loadstring(%q)", string.dump(o))
elseif tp == "userdata" then
return tostring(o)
else
return string.format("<%s>", tp)
end
end
local keywords = {
["and"] = true,
["break"] = true,
["do"] = true,
["else"] = true,
["elseif"] = true,
["end"] = true,
["false"] = true,
["for"] = true,
["function"] = true,
["goto"] = true, -- Lua 5.2
["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 is_valid_identifier(str)
if not str:find("^[a-zA-Z_][a-zA-Z0-9_]*$") or keywords[str] then
return false
end
return true
end
--------------------------------------------------------------------------------
-- Dumps values in a line-per-value format.
-- For example, {test = {"Testing..."}} becomes:
-- _["test"] = {}
-- _["test"][1] = "Testing..."
-- This handles tables as keys and circular references properly.
-- It also handles multiple references well, writing the table only once.
-- The dumped argument is internal-only.
function dump2(o, name, dumped)
name = name or "_"
-- "dumped" is used to keep track of serialized tables to handle
-- multiple references and circular tables properly.
-- It only contains tables as keys. The value is the name that
-- the table has in the dump, eg:
-- {x = {"y"}} -> dumped[{"y"}] = '_["x"]'
dumped = dumped or {}
if type(o) ~= "table" then
return string.format("%s = %s\n", name, basic_dump(o))
end
if dumped[o] then
return string.format("%s = %s\n", name, dumped[o])
end
dumped[o] = name
-- This contains a list of strings to be concatenated later (because
-- Lua is slow at individual concatenation).
local t = {}
for k, v in pairs(o) do
local keyStr
if type(k) == "table" then
if dumped[k] then
keyStr = dumped[k]
else
-- Key tables don't have a name, so use one of
-- the form _G["table: 0xFFFFFFF"]
keyStr = string.format("_G[%q]", tostring(k))
-- Dump key table
t[#t + 1] = dump2(k, keyStr, dumped)
end
else
keyStr = basic_dump(k)
end
local vname = string.format("%s[%s]", name, keyStr)
t[#t + 1] = dump2(v, vname, dumped)
end
return string.format("%s = {}\n%s", name, table.concat(t))
end
--------------------------------------------------------------------------------
-- This dumps values in a one-statement format.
-- For example, {test = {"Testing..."}} becomes:
-- [[{
-- test = {
-- "Testing..."
-- }
-- }]]
-- This supports tables as keys, but not circular references.
-- It performs poorly with multiple references as it writes out the full
-- table each time.
-- The indent field specifies a indentation string, it defaults to a tab.
-- Use the empty string to disable indentation.
-- The dumped and level arguments are internal-only.
function dump(o, indent, nested, level)
local t = type(o)
if not level and t == "userdata" then
-- when userdata (e.g. player) is passed directly, print its metatable:
return "userdata metatable: " .. dump(getmetatable(o))
end
if t ~= "table" then
return basic_dump(o)
end
-- Contains table -> true/nil of currently nested tables
nested = nested or {}
if nested[o] then
return "<circular reference>"
end
nested[o] = true
indent = indent or "\t"
level = level or 1
local ret = {}
local dumped_indexes = {}
for i, v in ipairs(o) do
ret[#ret + 1] = dump(v, indent, nested, level + 1)
dumped_indexes[i] = true
end
for k, v in pairs(o) do
if not dumped_indexes[k] then
if type(k) ~= "string" or not is_valid_identifier(k) then
k = "["..dump(k, indent, nested, level + 1).."]"
end
v = dump(v, indent, nested, level + 1)
ret[#ret + 1] = k.." = "..v
end
end
nested[o] = nil
if indent ~= "" then
local indent_str = "\n"..string.rep(indent, level)
local end_indent_str = "\n"..string.rep(indent, level - 1)
return string.format("{%s%s%s}",
indent_str,
table.concat(ret, ","..indent_str),
end_indent_str)
end
return "{"..table.concat(ret, ", ").."}"
end
--------------------------------------------------------------------------------
function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
delim = delim or ","
max_splits = max_splits or -2
local items = {}
local pos, len = 1, #str
local plain = not sep_is_pattern
max_splits = max_splits + 1
repeat
local np, npe = string_find(str, delim, pos, plain)
np, npe = (np or (len+1)), (npe or (len+1))
if (not np) or (max_splits == 1) then
np = len + 1
npe = np
end
local s = string_sub(str, pos, np - 1)
if include_empty or (s ~= "") then
max_splits = max_splits - 1
items[#items + 1] = s
end
pos = npe + 1
until (max_splits == 0) or (pos > (len + 1))
return items
end
--------------------------------------------------------------------------------
function table.indexof(list, val)
for i, v in ipairs(list) do
if v == val then
return i
end
end
return -1
end
--------------------------------------------------------------------------------
function string:trim()
return (self:gsub("^%s*(.-)%s*$", "%1"))
end
--------------------------------------------------------------------------------
function math.hypot(x, y)
local t
x = math.abs(x)
y = math.abs(y)
t = math.min(x, y)
x = math.max(x, y)
if x == 0 then return 0 end
t = t / x
return x * math.sqrt(1 + t * t)
end
--------------------------------------------------------------------------------
function math.sign(x, tolerance)
tolerance = tolerance or 0
if x > tolerance then
return 1
elseif x < -tolerance then
return -1
end
return 0
end
--------------------------------------------------------------------------------
function math.factorial(x)
assert(x % 1 == 0 and x >= 0, "factorial expects a non-negative integer")
if x >= 171 then
-- 171! is greater than the biggest double, no need to calculate
return math.huge
end
local v = 1
for k = 2, x do
v = v * k
end
return v
end
function math.round(x)
if x >= 0 then
return math.floor(x + 0.5)
end
return math.ceil(x - 0.5)
end
function core.formspec_escape(text)
if text ~= nil then
text = string.gsub(text,"\\","\\\\")
text = string.gsub(text,"%]","\\]")
text = string.gsub(text,"%[","\\[")
text = string.gsub(text,";","\\;")
text = string.gsub(text,",","\\,")
end
return text
end
function core.wrap_text(text, max_length, as_table)
local result = {}
local line = {}
if #text <= max_length then
return as_table and {text} or text
end
for word in text:gmatch('%S+') do
local cur_length = #table.concat(line, ' ')
if cur_length > 0 and cur_length + #word + 1 >= max_length then
-- word wouldn't fit on current line, move to next line
table.insert(result, table.concat(line, ' '))
line = {}
end
table.insert(line, word)
end
table.insert(result, table.concat(line, ' '))
return as_table and result or table.concat(result, '\n')
end
--------------------------------------------------------------------------------
if INIT == "game" then
local dirs1 = {9, 18, 7, 12}
local dirs2 = {20, 23, 22, 21}
function core.rotate_and_place(itemstack, placer, pointed_thing,
infinitestacks, orient_flags, prevent_after_place)
orient_flags = orient_flags or {}
local unode = core.get_node_or_nil(pointed_thing.under)
if not unode then
return
end
local undef = core.registered_nodes[unode.name]
local sneaking = placer and placer:get_player_control().sneak
if undef and undef.on_rightclick and not sneaking then
return undef.on_rightclick(pointed_thing.under, unode, placer,
itemstack, pointed_thing)
end
local fdir = placer and core.dir_to_facedir(placer:get_look_dir()) or 0
local above = pointed_thing.above
local under = pointed_thing.under
local iswall = (above.y == under.y)
local isceiling = not iswall and (above.y < under.y)
if undef and undef.buildable_to then
iswall = false
end
if orient_flags.force_floor then
iswall = false
isceiling = false
elseif orient_flags.force_ceiling then
iswall = false
isceiling = true
elseif orient_flags.force_wall then
iswall = true
isceiling = false
elseif orient_flags.invert_wall then
iswall = not iswall
end
local param2 = fdir
if iswall then
param2 = dirs1[fdir + 1]
elseif isceiling then
if orient_flags.force_facedir then
param2 = 20
else
param2 = dirs2[fdir + 1]
end
else -- place right side up
if orient_flags.force_facedir then
param2 = 0
end
end
local old_itemstack = ItemStack(itemstack)
local new_itemstack = core.item_place_node(itemstack, placer,
pointed_thing, param2, prevent_after_place)
return infinitestacks and old_itemstack or new_itemstack
end
--------------------------------------------------------------------------------
--Wrapper for rotate_and_place() to check for sneak and assume Creative mode
--implies infinite stacks when performing a 6d rotation.
--------------------------------------------------------------------------------
core.rotate_node = function(itemstack, placer, pointed_thing)
local name = placer and placer:get_player_name() or ""
local invert_wall = placer and placer:get_player_control().sneak or false
return core.rotate_and_place(itemstack, placer, pointed_thing,
core.is_creative_enabled(name),
{invert_wall = invert_wall}, true)
end
end
--------------------------------------------------------------------------------
function core.explode_table_event(evt)
if evt ~= nil then
local parts = evt:split(":")
if #parts == 3 then
local t = parts[1]:trim()
local r = tonumber(parts[2]:trim())
local c = tonumber(parts[3]:trim())
if type(r) == "number" and type(c) == "number"
and t ~= "INV" then
return {type=t, row=r, column=c}
end
end
end
return {type="INV", row=0, column=0}
end
--------------------------------------------------------------------------------
function core.explode_textlist_event(evt)
if evt ~= nil then
local parts = evt:split(":")
if #parts == 2 then
local t = parts[1]:trim()
local r = tonumber(parts[2]:trim())
if type(r) == "number" and t ~= "INV" then
return {type=t, index=r}
end
end
end
return {type="INV", index=0}
end
--------------------------------------------------------------------------------
function core.explode_scrollbar_event(evt)
local retval = core.explode_textlist_event(evt)
retval.value = retval.index
retval.index = nil
return retval
end
--------------------------------------------------------------------------------
function core.rgba(r, g, b, a)
return a and string.format("#%02X%02X%02X%02X", r, g, b, a) or
string.format("#%02X%02X%02X", r, g, b)
end
--------------------------------------------------------------------------------
function core.pos_to_string(pos, decimal_places)
local x = pos.x
local y = pos.y
local z = pos.z
if decimal_places ~= nil then
x = string.format("%." .. decimal_places .. "f", x)
y = string.format("%." .. decimal_places .. "f", y)
z = string.format("%." .. decimal_places .. "f", z)
end
return "(" .. x .. "," .. y .. "," .. z .. ")"
end
--------------------------------------------------------------------------------
function core.string_to_pos(value)
if value == nil then
return nil
end
local p = {}
p.x, p.y, p.z = string.match(value, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
if p.x and p.y and p.z then
p.x = tonumber(p.x)
p.y = tonumber(p.y)
p.z = tonumber(p.z)
return p
end
p = {}
p.x, p.y, p.z = string.match(value, "^%( *([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+) *%)$")
if p.x and p.y and p.z then
p.x = tonumber(p.x)
p.y = tonumber(p.y)
p.z = tonumber(p.z)
return p
end
return nil
end
--------------------------------------------------------------------------------
function core.string_to_area(value)
local p1, p2 = unpack(value:split(") ("))
if p1 == nil or p2 == nil then
return nil
end
p1 = core.string_to_pos(p1 .. ")")
p2 = core.string_to_pos("(" .. p2)
if p1 == nil or p2 == nil then
return nil
end
return p1, p2
end
local function test_string_to_area()
local p1, p2 = core.string_to_area("(10.0, 5, -2) ( 30.2, 4, -12.53)")
assert(p1.x == 10.0 and p1.y == 5 and p1.z == -2)
assert(p2.x == 30.2 and p2.y == 4 and p2.z == -12.53)
p1, p2 = core.string_to_area("(10.0, 5, -2 30.2, 4, -12.53")
assert(p1 == nil and p2 == nil)
p1, p2 = core.string_to_area("(10.0, 5,) -2 fgdf2, 4, -12.53")
assert(p1 == nil and p2 == nil)
end
test_string_to_area()
--------------------------------------------------------------------------------
function table.copy(t, seen)
local n = {}
seen = seen or {}
seen[t] = n
for k, v in pairs(t) do
n[(type(k) == "table" and (seen[k] or table.copy(k, seen))) or k] =
(type(v) == "table" and (seen[v] or table.copy(v, seen))) or v
end
return n
end
function table.insert_all(t, other)
for i=1, #other do
t[#t + 1] = other[i]
end
return t
end
function table.key_value_swap(t)
local ti = {}
for k,v in pairs(t) do
ti[v] = k
end
return ti
end
function table.shuffle(t, from, to, random)
from = from or 1
to = to or #t
random = random or math.random
local n = to - from + 1
while n > 1 do
local r = from + n-1
local l = from + random(0, n-1)
t[l], t[r] = t[r], t[l]
n = n-1
end
end
--------------------------------------------------------------------------------
-- mainmenu only functions
--------------------------------------------------------------------------------
if INIT == "mainmenu" then
function core.get_game(index)
local games = core.get_games()
if index > 0 and index <= #games then
return games[index]
end
return nil
end
end
if INIT == "client" or INIT == "mainmenu" then
function fgettext_ne(text, ...)
text = core.gettext(text)
local arg = {n=select('#', ...), ...}
if arg.n >= 1 then
-- Insert positional parameters ($1, $2, ...)
local result = ''
local pos = 1
while pos <= text:len() do
local newpos = text:find('[$]', pos)
if newpos == nil then
result = result .. text:sub(pos)
pos = text:len() + 1
else
local paramindex =
tonumber(text:sub(newpos+1, newpos+1))
result = result .. text:sub(pos, newpos-1)
.. tostring(arg[paramindex])
pos = newpos + 2
end
end
text = result
end
return text
end
function fgettext(text, ...)
return core.formspec_escape(fgettext_ne(text, ...))
end
end
local ESCAPE_CHAR = string.char(0x1b)
function core.get_color_escape_sequence(color)
return ESCAPE_CHAR .. "(c@" .. color .. ")"
end
function core.get_background_escape_sequence(color)
return ESCAPE_CHAR .. "(b@" .. color .. ")"
end
function core.colorize(color, message)
local lines = tostring(message):split("\n", true)
local color_code = core.get_color_escape_sequence(color)
for i, line in ipairs(lines) do
lines[i] = color_code .. line
end
return table.concat(lines, "\n") .. core.get_color_escape_sequence("#ffffff")
end
function core.strip_foreground_colors(str)
return (str:gsub(ESCAPE_CHAR .. "%(c@[^)]+%)", ""))
end
function core.strip_background_colors(str)
return (str:gsub(ESCAPE_CHAR .. "%(b@[^)]+%)", ""))
end
function core.strip_colors(str)
return (str:gsub(ESCAPE_CHAR .. "%([bc]@[^)]+%)", ""))
end
function core.translate(textdomain, str, ...)
local start_seq
if textdomain == "" then
start_seq = ESCAPE_CHAR .. "T"
else
start_seq = ESCAPE_CHAR .. "(T@" .. textdomain .. ")"
end
local arg = {n=select('#', ...), ...}
local end_seq = ESCAPE_CHAR .. "E"
local arg_index = 1
local translated = str:gsub("@(.)", function(matched)
local c = string.byte(matched)
if string.byte("1") <= c and c <= string.byte("9") then
local a = c - string.byte("0")
if a ~= arg_index then
error("Escape sequences in string given to core.translate " ..
"are not in the correct order: got @" .. matched ..
"but expected @" .. tostring(arg_index))
end
if a > arg.n then
error("Not enough arguments provided to core.translate")
end
arg_index = arg_index + 1
return ESCAPE_CHAR .. "F" .. arg[a] .. ESCAPE_CHAR .. "E"
elseif matched == "n" then
return "\n"
else
return matched
end
end)
if arg_index < arg.n + 1 then
error("Too many arguments provided to core.translate")
end
return start_seq .. translated .. end_seq
end
function core.get_translator(textdomain)
return function(str, ...) return core.translate(textdomain or "", str, ...) end
end
--------------------------------------------------------------------------------
-- Returns the exact coordinate of a pointed surface
--------------------------------------------------------------------------------
function core.pointed_thing_to_face_pos(placer, pointed_thing)
-- Avoid crash in some situations when player is inside a node, causing
-- 'above' to equal 'under'.
if vector.equals(pointed_thing.above, pointed_thing.under) then
return pointed_thing.under
end
local eye_height = placer:get_properties().eye_height
local eye_offset_first = placer:get_eye_offset()
local node_pos = pointed_thing.under
local camera_pos = placer:get_pos()
local pos_off = vector.multiply(
vector.subtract(pointed_thing.above, node_pos), 0.5)
local look_dir = placer:get_look_dir()
local offset, nc
local oc = {}
for c, v in pairs(pos_off) do
if nc or v == 0 then
oc[#oc + 1] = c
else
offset = v
nc = c
end
end
local fine_pos = {[nc] = node_pos[nc] + offset}
camera_pos.y = camera_pos.y + eye_height + eye_offset_first.y / 10
local f = (node_pos[nc] + offset - camera_pos[nc]) / look_dir[nc]
for i = 1, #oc do
fine_pos[oc[i]] = camera_pos[oc[i]] + look_dir[oc[i]] * f
end
return fine_pos
end
function core.string_to_privs(str, delim)
assert(type(str) == "string")
delim = delim or ','
local privs = {}
for _, priv in pairs(string.split(str, delim)) do
privs[priv:trim()] = true
end
return privs
end
function core.privs_to_string(privs, delim)
assert(type(privs) == "table")
delim = delim or ','
local list = {}
for priv, bool in pairs(privs) do
if bool then
list[#list + 1] = priv
end
end
return table.concat(list, delim)
end
function core.is_nan(number)
return number ~= number
end