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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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