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minetest/builtin/common/misc_helpers.lua

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-- Minetest: builtin/misc_helpers.lua
--------------------------------------------------------------------------------
-- Localize functions to avoid table lookups (better performance).
local table_insert = table.insert
local string_sub, string_find = string.sub, string.find
--------------------------------------------------------------------------------
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))
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
table_insert(t, dump2(k, keyStr, dumped))
end
else
keyStr = basic_dump(k)
end
local vname = string.format("%s[%s]", name, keyStr)
table_insert(t, 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)
if type(o) ~= "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 t = {}
local dumped_indexes = {}
for i, v in ipairs(o) do
table_insert(t, 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)
table_insert(t, 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(t, ","..indent_str),
end_indent_str)
end
return "{"..table.concat(t, ", ").."}"
end
--------------------------------------------------------------------------------
function string.split(str, delim, include_empty, max_splits, sep_is_pattern)
delim = delim or ","
max_splits = max_splits or -1
local items = {}
local pos, len, seplen = 1, #str, #delim
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
table_insert(items, s)
end
pos = npe + 1
until (max_splits == 0) or (pos > (len + 1))
return items
end
--------------------------------------------------------------------------------
function table.indexof(list, val)
for i = 1, #list do
if list[i] == val then
return i
end
end
return -1
end
assert(table.indexof({"foo", "bar"}, "foo") == 1)
assert(table.indexof({"foo", "bar"}, "baz") == -1)
--------------------------------------------------------------------------------
function file_exists(filename)
local f = io.open(filename, "r")
if f == nil then
return false
else
f:close()
return true
end
end
--------------------------------------------------------------------------------
function string:trim()
return (self:gsub("^%s*(.-)%s*$", "%1"))
end
assert(string.trim("\n \t\tfoo bar\t ") == "foo bar")
--------------------------------------------------------------------------------
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 get_last_folder(text,count)
local parts = text:split(DIR_DELIM)
if count == nil then
return parts[#parts]
end
local retval = ""
for i=1,count,1 do
retval = retval .. parts[#parts - (count-i)] .. DIR_DELIM
end
return retval
end
--------------------------------------------------------------------------------
function cleanup_path(temppath)
local parts = temppath:split("-")
temppath = ""
for i=1,#parts,1 do
if temppath ~= "" then
temppath = temppath .. "_"
end
temppath = temppath .. parts[i]
end
parts = temppath:split(".")
temppath = ""
for i=1,#parts,1 do
if temppath ~= "" then
temppath = temppath .. "_"
end
temppath = temppath .. parts[i]
end
parts = temppath:split("'")
temppath = ""
for i=1,#parts,1 do
if temppath ~= "" then
temppath = temppath .. ""
end
temppath = temppath .. parts[i]
end
parts = temppath:split(" ")
temppath = ""
for i=1,#parts,1 do
if temppath ~= "" then
temppath = temppath
end
temppath = temppath .. parts[i]
end
return temppath
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.splittext(text,charlimit)
local retval = {}
local current_idx = 1
local start,stop = string_find(text, " ", current_idx)
local nl_start,nl_stop = string_find(text, "\n", current_idx)
local gotnewline = false
if nl_start ~= nil and (start == nil or nl_start < start) then
start = nl_start
stop = nl_stop
gotnewline = true
end
local last_line = ""
while start ~= nil do
if string.len(last_line) + (stop-start) > charlimit then
table_insert(retval, last_line)
last_line = ""
end
if last_line ~= "" then
last_line = last_line .. " "
end
last_line = last_line .. string_sub(text, current_idx, stop - 1)
if gotnewline then
table_insert(retval, last_line)
last_line = ""
gotnewline = false
end
current_idx = stop+1
start,stop = string_find(text, " ", current_idx)
nl_start,nl_stop = string_find(text, "\n", current_idx)
if nl_start ~= nil and (start == nil or nl_start < start) then
start = nl_start
stop = nl_stop
gotnewline = true
end
end
--add last part of text
if string.len(last_line) + (string.len(text) - current_idx) > charlimit then
table_insert(retval, last_line)
table_insert(retval, string_sub(text, current_idx))
else
last_line = last_line .. " " .. string_sub(text, current_idx)
table_insert(retval, last_line)
end
return retval
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)
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]
if undef and undef.on_rightclick then
undef.on_rightclick(pointed_thing.under, unode, placer,
itemstack, pointed_thing)
return
end
local pitch = placer:get_look_pitch()
local fdir = core.dir_to_facedir(placer:get_look_dir())
local wield_name = itemstack:get_name()
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)
local anode = core.get_node_or_nil(above)
if not anode then
return
end
local pos = pointed_thing.above
local node = anode
if undef and undef.buildable_to then
pos = pointed_thing.under
node = unode
iswall = false
end
if core.is_protected(pos, placer:get_player_name()) then
core.record_protection_violation(pos,
placer:get_player_name())
return
end
local ndef = core.registered_nodes[node.name]
if not ndef or not ndef.buildable_to then
return
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
if iswall then
core.set_node(pos, {name = wield_name,
param2 = dirs1[fdir+1]})
elseif isceiling then
if orient_flags.force_facedir then
core.set_node(pos, {name = wield_name,
param2 = 20})
else
core.set_node(pos, {name = wield_name,
param2 = dirs2[fdir+1]})
end
else -- place right side up
if orient_flags.force_facedir then
core.set_node(pos, {name = wield_name,
param2 = 0})
else
core.set_node(pos, {name = wield_name,
param2 = fdir})
end
end
if not infinitestacks then
itemstack:take_item()
return itemstack
end
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)
core.rotate_and_place(itemstack, placer, pointed_thing,
core.setting_getbool("creative_mode"),
{invert_wall = placer:get_player_control().sneak})
return itemstack
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.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.-]+)$")
if p.x and p.y and p.z then
p.x = tonumber(p.x)
p.y = tonumber(p.y)
p.z = tonumber(p.z)
return p
end
local p = {}
p.x, p.y, p.z = string.match(value, "^%( *([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+) *%)$")
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
return nil
end
assert(core.string_to_pos("10.0, 5, -2").x == 10)
assert(core.string_to_pos("( 10.0, 5, -2)").z == -2)
assert(core.string_to_pos("asd, 5, -2)") == nil)
--------------------------------------------------------------------------------
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
--------------------------------------------------------------------------------
-- mainmenu only functions
--------------------------------------------------------------------------------
if INIT == "mainmenu" then
function core.get_game(index)
local games = game.get_games()
if index > 0 and index <= #games then
return games[index]
end
return nil
end
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
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