modlib/conf.lua
2021-06-17 19:45:08 +02:00

306 lines
10 KiB
Lua

-- Localize globals
local assert, dump, error, ipairs, minetest, modlib, pairs, pcall, table, tonumber, type = assert, dump, error, ipairs, minetest, modlib, pairs, pcall, table, tonumber, type
-- Set environment
local _ENV = {}
setfenv(1, _ENV)
-- not deprecated
function build_tree(dict)
local tree = {}
for key, value in pairs(dict) do
local path = modlib.text.split_unlimited(key, ".")
local subtree = tree
for i = 1, #path - 1 do
local index = tonumber(path[i]) or path[i]
subtree[index] = subtree[index] or {}
subtree = subtree[index]
end
subtree[path[#path]] = value
end
return tree
end
if minetest then
function build_setting_tree()
modlib.conf.settings = build_tree(minetest.settings:to_table())
end
-- deprecated, use modlib.mod.configuration instead
minetest.mkdir(minetest.get_worldpath().."/config")
function get_path(confname)
return minetest.get_worldpath().."/config/"..confname
end
end
function read_conf(text)
local lines = modlib.text.split_lines(text, nil, true)
local dict = {}
for i, line in ipairs(lines) do
local error_base = "Line " .. (i+1) .. ": "
line = modlib.text.trim_left(lines[i])
if line ~= "" and line:sub(1,1) ~= "#" then
line = modlib.text.split(line, "=", 2)
if #line ~= 2 then
error(error_base .. "No value given")
end
local prop = modlib.text.trim_right(line[1])
if prop == "" then
error(error_base .. "No key given")
end
local val = modlib.text.trim_left(line[2])
if val == "" then
error(error_base .. "No value given")
end
if modlib.text.starts_with(val, '"""') then
val = val:sub(3)
local total_val = {}
local function readMultiline()
while i < #lines do
if modlib.text.ends_with(val, '"""') then
val = val:sub(1, val:len() - 3)
return
end
table.insert(total_val, val)
i = i + 1
val = lines[i]
end
i = i - 1
error(error_base .. "Unclosed multiline block")
end
readMultiline()
table.insert(total_val, val)
val = table.concat(total_val, "\n")
else
val = modlib.text.trim_right(val)
end
if dict[prop] then
error(error_base .. "Duplicate key")
end
dict[prop] = val
end
end
return dict
end
function check_config_constraints(config, constraints, handler)
local no_error, error_or_retval = pcall(function() check_constraints(config, constraints) end)
if not no_error then
handler(error_or_retval)
end
end
function load(filename, constraints)
local config = minetest.parse_json(modlib.file.read(filename))
if constraints then
check_config_constraints(config, constraints, function(message)
error('Configuration of file "'..filename.."\" doesn't satisfy constraints: "..message)
end)
end
return config
end
function load_or_create(filename, replacement_file, constraints)
modlib.file.create_if_not_exists_from_file(filename, replacement_file)
return load(filename, constraints)
end
function import(modname, constraints, no_settingtypes)
local default_config = modlib.mod.get_resource(modname, "default_config.json")
local default_conf = minetest.parse_json(modlib.file.read(default_config))
local config = load_or_create(get_path(modname)..".json", default_config, constraints)
local formats = {
{ extension = ".lua", load = minetest.deserialize },
{ extension = ".luon", load = function(text) minetest.deserialize("return "..text) end },
{ extension = ".conf", load = function(text) return fix_types(build_tree(read_conf(text)), constraints) end }
}
for _, format in ipairs(formats) do
local conf = modlib.file.read(get_path(modname)..format.extension)
if conf then
config = merge_config(config, format.load(conf))
end
end
if not no_settingtypes then
constraints.name = modname
local settingtypes = generate_settingtypes(default_conf, constraints)
modlib.file.write(modlib.mod.get_resource(modname, "settingtypes.txt"), settingtypes)
end
local additional_settings = modlib.conf.settings[modname] or {}
additional_settings = fix_types(additional_settings, constraints)
-- TODO implement merge_config_legal(default_conf, ...)
config = merge_config(config, additional_settings)
if constraints then
check_config_constraints(config, constraints, function(message)
error('Configuration of mod "'..modname.."\" doesn't satisfy constraints: "..message)
end)
end
return config
end
function merge_config(config, additional_settings)
if not config or type(additional_settings) ~= "table" then
return additional_settings
end
for setting, value in pairs(additional_settings) do
if config[setting] then
config[setting] = merge_config(config[setting], value)
end
end
return config
end
-- format: # comment
-- name (Readable name) type type_args
function generate_settingtypes(default_conf, constraints)
local constraint_type = constraints.type
if constraints.children or constraints.possible_children or constraints.required_children or constraints.keys or constraints.values then
constraint_type = "table"
end
local settingtype, type_args
local title = constraints.title
if not title then
title = modlib.text.split(constraints.name, "_")
title[1] = modlib.text.upper_first(title[1])
title = table.concat(title, " ")
end
if constraint_type == "boolean" then
settingtype = "bool"
default_conf = default_conf and "true" or "false"
elseif constraint_type == "string" then
settingtype = "string"
elseif constraint_type == "number" then
settingtype = constraints.int and "int" or "float"
local range = constraints.range
if range then
-- TODO consider better max
type_args = (constraints.int and "%d %d" or "%f %f"):format(range[1], range[2] or (2 ^ 30))
end
-- HACK
if not default_conf then default_conf = range[1] end
elseif constraint_type == "table" then
local handled = {}
local settings = {}
local function setting(key, value_constraints)
if handled[key] then
return
end
handled[key] = true
value_constraints.name = constraints.name .. "." .. key
value_constraints.title = title .. " " .. key
table.insert(settings, generate_settingtypes(default_conf and default_conf[key], value_constraints))
end
for _, table in ipairs{"children", "required_children", "possible_children"} do
for key, constraints in pairs(constraints[table] or {}) do
setting(key, constraints)
end
end
return table.concat(settings, "\n")
end
if not constraint_type then
return ""
end
local comment = constraints.comment
if comment then
comment = "# " .. comment .. "\n"
else
comment = ""
end
assert(type(default_conf) == "string" or type(default_conf) == "number" or type(default_conf) == "nil", dump(default_conf))
return comment .. constraints.name .. " (" .. title .. ") " .. settingtype .. " " .. (default_conf or "") ..(type_args and (" "..type_args) or "")
end
function fix_types(value, constraints)
local type = type(value)
local expected_type = constraints.type
if expected_type and expected_type ~= type then
assert(type == "string", "Can't fix non-string value")
if expected_type == "boolean" then
assert(value == "true" or value == "false", "Not a boolean (true or false): " .. value)
value = value == "true"
elseif expected_type == "number" then
assert(tonumber(value), "Not a number: " .. value)
value = tonumber(value)
end
end
if type == "table" then
for key, val in pairs(value) do
for _, child_constraints in ipairs{"required_children", "children", "possible_children"} do
child_constraints = (constraints[child_constraints] or {})[key]
if child_constraints then
val = fix_types(val, child_constraints)
end
end
if constraints.values then
val = fix_types(val, constraints.values)
end
if constraints.keys then
value[key] = nil
value[fix_types(key, constraints.keys)] = val
else
value[key] = val
end
end
end
return value
end
function check_constraints(value, constraints)
local t = type(value)
if constraints.type and constraints.type ~= t then
error("Wrong type: Expected "..constraints.type..", found "..t)
end
if (t == "number" or t == "string") and constraints.range then
if value < constraints.range[1] or (constraints.range[2] and value > constraints.range[2]) then
error("Not inside range: Expected value >= "..constraints.range[1].." and <= "..(constraints.range[2] or "inf")..", found "..minetest.write_json(value))
end
end
if t == "number" and constraints.int and value % 1 ~= 0 then
error("Not an integer number: " .. minetest.write_json(value))
end
if constraints.possible_values and not constraints.possible_values[value] then
error("None of the possible values: Expected one of "..minetest.write_json(modlib.table.keys(constraints.possible_values))..", found "..minetest.write_json(value))
end
if t == "table" then
if constraints.children then
for key, val in pairs(value) do
local child_constraints = constraints.children[key]
if not child_constraints then
error("Unexpected table entry: Expected one of "..minetest.write_json(modlib.table.keys(constraints.children))..", found "..minetest.write_json(key))
else
check_constraints(val, child_constraints)
end
end
for key, _ in pairs(constraints.children) do
if value[key] == nil then
error("Table entry missing: Expected key "..minetest.write_json(key).." to be present in table "..minetest.write_json(value))
end
end
end
if constraints.required_children then
for key, value_constraints in pairs(constraints.required_children) do
local val = value[key]
if val then
check_constraints(val, value_constraints)
else
error("Table entry missing: Expected key "..minetest.write_json(key).." to be present in table "..minetest.write_json(value))
end
end
end
if constraints.possible_children then
for key, value_constraints in pairs(constraints.possible_children) do
local val = value[key]
if val then
check_constraints(val, value_constraints)
end
end
end
if constraints.keys then
for key,_ in pairs(value) do
check_constraints(key, constraints.keys)
end
end
if constraints.values then
for _, val in pairs(value) do
check_constraints(val, constraints.values)
end
end
end
if constraints.func then
local possible_errors = constraints.func(value)
if possible_errors then
error(possible_errors)
end
end
end
-- Export environment
return _ENV