/
helper.lua
336 lines (302 loc) · 10.3 KB
/
helper.lua
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--! #textdomain wesnoth
local helper = {}
local wml_actions = wesnoth.wml_actions
--! Returns an iterator over all the sides matching a given filter that can be used in a for-in loop.
function helper.get_sides(cfg)
local function f(s)
local i = s.i
while i < #wesnoth.sides do
i = i + 1
if wesnoth.match_side(i, cfg) then
s.i = i
return wesnoth.sides[i], i
end
end
end
return f, { i = 0 }
end
--! Interrupts the current execution and displays a chat message that looks like a WML error.
function helper.wml_error(m)
error("~wml:" .. m, 0)
end
--! Returns an iterator over teams that can be used in a for-in loop.
function helper.all_teams()
local function f(s)
local i = s.i
local team = wesnoth.sides[i]
s.i = i + 1
return team
end
return f, { i = 1 }
end
--! Modifies all the units satisfying the given @a filter.
--! @param vars key/value pairs that need changing.
--! @note Usable only during WML actions.
function helper.modify_unit(filter, vars)
wml_actions.store_unit({
[1] = { "filter", filter },
variable = "LUA_modify_unit",
kill = true
})
for i = 0, wesnoth.get_variable("LUA_modify_unit.length") - 1 do
local u = string.format("LUA_modify_unit[%d]", i)
for k, v in pairs(vars) do
wesnoth.set_variable(u .. '.' .. k, v)
end
wml_actions.unstore_unit({
variable = u,
find_vacant = false
})
end
wesnoth.set_variable("LUA_modify_unit")
end
--! Fakes the move of a unit satisfying the given @a filter to position @a x, @a y.
--! @note Usable only during WML actions.
function helper.move_unit_fake(filter, to_x, to_y)
wml_actions.store_unit({
[1] = { "filter", filter },
variable = "LUA_move_unit",
kill = false
})
local from_x = wesnoth.get_variable("LUA_move_unit.x")
local from_y = wesnoth.get_variable("LUA_move_unit.y")
wml_actions.scroll_to({ x=from_x, y=from_y })
if to_x < from_x then
wesnoth.set_variable("LUA_move_unit.facing", "sw")
elseif to_x > from_x then
wesnoth.set_variable("LUA_move_unit.facing", "se")
end
wesnoth.set_variable("LUA_move_unit.x", to_x)
wesnoth.set_variable("LUA_move_unit.y", to_y)
wml_actions.kill({
x = from_x,
y = from_y,
animate = false,
fire_event = false
})
wml_actions.move_unit_fake({
type = "$LUA_move_unit.type",
gender = "$LUA_move_unit.gender",
variation = "$LUA_move_unit.variation",
side = "$LUA_move_unit.side",
x = from_x .. ',' .. to_x,
y = from_y .. ',' .. to_y
})
wml_actions.unstore_unit({ variable="LUA_move_unit", find_vacant=true })
wml_actions.redraw({})
wesnoth.set_variable("LUA_move_unit")
end
-- Metatable that redirects access to wml.variables_proxy
local proxy_var_mt = {
__metatable = "WML variables",
__index = function(t, k) return wml.variables_proxy[k] end,
__newindex = function(t, k, v) wml.variables_proxy[k] = v end,
}
function helper.set_wml_var_metatable(t)
return setmetatable(t, proxy_var_mt)
end
local fire_action_mt = {
__metatable = "WML actions",
__index = function(t, n)
return function(cfg) wesnoth.fire(n, cfg) end
end
}
--! Sets the metatable of @a t so that it can be used to fire WML actions.
--! @return @a t.
--! @code
--! W = helper.set_wml_action_metatable {}
--! W.message { speaker = "narrator", message = "?" }
--! @endcode
function helper.set_wml_action_metatable(t)
return setmetatable(t, fire_action_mt)
end
-- Metatable that redirects to wml.tag
local proxy_tag_mt = {
__metatable = "WML tag builder",
__index = function(t, n) return wml.tag[n] end
}
function helper.set_wml_tag_metatable(t)
return setmetatable(t, proxy_tag_mt)
end
--! Displays a WML message box with attributes from table @attr and options
--! from table @options.
--! @return the index of the selected option.
--! @code
--! local result = helper.get_user_choice({ speaker = "narrator" },
--! { "Choice 1", "Choice 2" })
--! @endcode
function helper.get_user_choice(attr, options)
local result = 0
function wesnoth.__user_choice_helper(i)
result = i
end
local msg = {}
for k,v in pairs(attr) do
msg[k] = attr[k]
end
for k,v in ipairs(options) do
table.insert(msg, { "option", { message = v,
{ "command", { { "lua", {
code = string.format("wesnoth.__user_choice_helper(%d)", k)
}}}}}})
end
wml_actions.message(msg)
wesnoth.__user_choice_helper = nil
return result
end
--! Returns an iterator over adjacent locations that can be used in a for-in loop.
-- Not deprecated because, unlike wesnoth.map.get_adjacent_tiles,
-- this verifies that the locations are on the map.
function helper.adjacent_tiles(x, y, with_borders)
local x1,y1,x2,y2,b = 1,1,wesnoth.get_map_size()
if with_borders then
x1 = x1 - b
y1 = y1 - b
x2 = x2 + b
y2 = y2 + b
end
local adj = {wesnoth.map.get_adjacent_tiles(x, y)}
local i = 0
return function()
while i < #adj do
i = i + 1
local u, v = adj[i][1], adj[i][2]
if u >= x1 and u <= x2 and v >= y1 and v <= y2 then
return u, v
end
end
return nil
end
end
function helper.rand (possible_values, random_func)
random_func = random_func or wesnoth.random
assert(type(possible_values) == "table" or type(possible_values) == "string",
string.format("helper.rand expects a string or table as parameter, got %s instead",
type(possible_values)))
local items = {}
local num_choices = 0
if type(possible_values) == "string" then
-- split on commas
for word in possible_values:gmatch("[^,]+") do
-- does the word contain two dots? If yes, that's a range
local dots_start, dots_end = word:find("%.%.")
if dots_start then
-- split on the dots if so and cast as numbers
local low = tonumber(word:sub(1, dots_start-1))
local high = tonumber(word:sub(dots_end+1))
-- perhaps someone passed a string as part of the range, intercept the issue
if not (low and high) then
wesnoth.message("Malformed range: " .. possible_values)
table.insert(items, word)
num_choices = num_choices + 1
else
if low > high then
-- low is greater than high, swap them
low, high = high, low
end
-- if both ends represent the same number, then just use that number
if low == high then
table.insert(items, low)
num_choices = num_choices + 1
else
-- insert a table representing the range
table.insert(items, {low, high})
-- how many items does the range contain? Increase difference by 1 because we include both ends
num_choices = num_choices + (high - low) + 1
end
end
else
-- handle as a string
table.insert(items, word)
num_choices = num_choices + 1
end
end
else
num_choices = #possible_values
items = possible_values
-- We need to parse ranges separately anyway
for i, val in ipairs(possible_values) do
if type(val) == "table" then
assert(#val == 2 and type(val[1]) == "number" and type(val[2]) == "number", "Malformed range for helper.rand")
if val[1] > val[2] then
val = {val[2], val[1]}
end
num_choices = num_choices + (val[2] - val[1])
end
end
end
local idx = random_func(1, num_choices)
for i, item in ipairs(items) do
if type(item) == "table" then -- that's a range
local elems = item[2] - item[1] + 1 -- amount of elements in the range, both ends included
if elems >= idx then
return item[1] + elems - idx
else
idx = idx - elems
end
else -- that's a single element
idx = idx - 1
if idx == 0 then
return item
end
end
end
return nil
end
function helper.deprecate(msg, f)
return function(...)
if msg then
wesnoth.log("warn", msg, wesnoth.game_config.debug)
-- trigger the message only once
msg = nil
end
return f(...)
end
end
function helper.round( number )
-- code converted from util.hpp, round_portable function
-- round half away from zero method
if number >= 0 then
number = math.floor( number + 0.5 )
else
number = math.ceil ( number - 0.5 )
end
return number
end
function helper.shuffle( t, random_func )
random_func = random_func or wesnoth.random
-- since tables are passed by reference, this is an in-place shuffle
-- it uses the Fisher-Yates algorithm, also known as Knuth shuffle
assert(
type( t ) == "table",
string.format( "helper.shuffle expects a table as parameter, got %s instead", type( t ) ) )
local length = #t
for index = length, 2, -1 do
local random = random_func( 1, index )
t[index], t[random] = t[random], t[index]
end
end
function helper.find_attack(unit, filter)
for i, atk in ipairs(unit.attacks) do
if atk:matches(filter) then return atk end
end
end
-- Compatibility and deprecations
helper.distance_between = wesnoth.deprecate_api('helper.distance_between', 'wesnoth.map.distance_between', 1, nil, wesnoth.map.distance_between)
helper.get_child = wesnoth.deprecate_api('helper.get_child', 'wml.get_child', 1, nil, wml.get_child)
helper.get_nth_child = wesnoth.deprecate_api('helper.get_nth_child', 'wml.get_nth_child', 1, nil, wml.get_nth_child)
helper.child_count = wesnoth.deprecate_api('helper.child_count', 'wml.child_count', 1, nil, wml.child_count)
helper.child_range = wesnoth.deprecate_api('helper.child_range', 'wml.child_range', 1, nil, wml.child_range)
helper.child_array = wesnoth.deprecate_api('helper.child_array', 'wml.child_array', 1, nil, wml.child_array)
if wesnoth.kernel_type() == "Game Lua Kernel" then
helper.get_variable_array = wesnoth.deprecate_api('helper.get_variable_array', ' wml.array_access.get', 1, nil, wml.array_access.get)
helper.set_variable_array = wesnoth.deprecate_api('helper.set_variable_array', 'wml.array_access.set', 1, nil, wml.array_access.set)
helper.get_variable_proxy_array = wesnoth.deprecate_api('helper.get_variable_proxy_array', 'wml.array_access.get_proxy', 1, nil, wml.array_access.get_proxy)
end
helper.literal = wesnoth.deprecate_api('helper.literal', 'wml.literal', 1, nil, wml.literal)
helper.parsed = wesnoth.deprecate_api('helper.parsed', 'wml.parsed', 1, nil, wml.parsed)
helper.shallow_literal = wesnoth.deprecate_api('helper.shallow_literal', 'wml.shallow_literal', 1, nil, wml.shallow_literal)
helper.shallow_parsed = wesnoth.deprecate_api('helper.shallow_parsed', 'wml.shallow_parsed', 1, nil, wml.shallow_parsed)
helper.set_wml_var_metatable = wesnoth.deprecate_api('helper.set_wml_var_metatable', 'wml.variable.proxy', 2, nil, helper.set_wml_var_metatable)
helper.set_wml_tag_metatable = wesnoth.deprecate_api('helper.set_wml_tag_metatable', 'wml.tag', 2, nil, helper.set_wml_tag_metatable)
return helper