126 lines
3.8 KiB
Lua
126 lines
3.8 KiB
Lua
local helper = wesnoth.require "helper"
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function wesnoth.wml_actions.set_variable(cfg)
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local name = cfg.name or helper.wml_error "trying to set a variable with an empty name"
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if cfg.value ~= nil then -- check for nil because user may try to set a variable as false
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wesnoth.set_variable(name, cfg.value)
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end
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if cfg.literal ~= nil then
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wesnoth.set_variable(name, helper.shallow_literal(cfg).literal)
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end
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if cfg.to_variable then
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wesnoth.set_variable(name, wesnoth.get_variable(cfg.to_variable))
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end
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if cfg.add then
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) + (tonumber(cfg.add) or 0))
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end
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if cfg.sub then
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) - (tonumber(cfg.sub) or 0))
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end
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if cfg.multiply then
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) * (tonumber(cfg.multiply) or 0))
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end
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if cfg.divide then
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local divide = tonumber(cfg.divide) or 0
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if divide == 0 then helper.wml_error("division by zero on variable " .. name) end
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) / divide)
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end
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if cfg.modulo then
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local modulo = tonumber(cfg.modulo) or 0
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if modulo == 0 then helper.wml_error("division by zero on variable " .. name) end
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) % modulo)
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end
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if cfg.abs then
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wesnoth.set_variable(name, math.abs(tonumber(wesnoth.get_variable(name)) or 0))
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end
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if cfg.root then
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if cfg.root == "square" then
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local radicand = tonumber(wesnoth.get_variable(name)) or 0
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if radicand < 0 then helper.wml_error("square root of negative number on variable " .. name) end
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wesnoth.set_variable(name, math.sqrt(radicand))
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end
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end
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if cfg.power then
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wesnoth.set_variable(name, (tonumber(wesnoth.get_variable(name)) or 0) ^ (tonumber(cfg.power) or 0))
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end
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if cfg.round then
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local var = tonumber(wesnoth.get_variable(name) or 0)
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local round_val = cfg.round
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if round_val == "ceil" then
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wesnoth.set_variable(name, math.ceil(var))
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elseif round_val == "floor" then
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wesnoth.set_variable(name, math.floor(var))
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else
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local decimals = math.modf(tonumber(round_val) or 0)
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local value = var * (10 ^ decimals)
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value = helper.round(value)
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value = value * (10 ^ -decimals)
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wesnoth.set_variable(name, value)
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end
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end
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-- unlike the other math operations, ipart and fpart do not act on
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-- the value already contained in the variable
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-- but on the value assigned to the respective key
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if cfg.ipart then
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local ivalue = math.modf(tonumber(cfg.ipart) or 0)
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wesnoth.set_variable(name, ivalue)
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end
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if cfg.fpart then
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local ivalue, fvalue = math.modf(tonumber(cfg.fpart) or 0)
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wesnoth.set_variable(name, fvalue)
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end
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if cfg.string_length ~= nil then
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wesnoth.set_variable(name, string.len(tostring(cfg.string_length)))
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end
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if cfg.time then
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if cfg.time == "stamp" then
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wesnoth.set_variable(name, wesnoth.get_time_stamp())
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end
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end
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if cfg.rand then
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wesnoth.set_variable(name, helper.rand(tostring(cfg.rand)))
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end
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if cfg.formula then
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local fcn = wesnoth.compile_formula(cfg.formula)
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wesnoth.set_variable(name, fcn(wesnoth.get_variable(name)))
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end
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local join_child = helper.get_child(cfg, "join")
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if join_child then
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local array_name = join_child.variable or helper.wml_error "missing variable= attribute in [join]"
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local separator = join_child.separator
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local key_name = join_child.key or "value"
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local remove_empty = join_child.remove_empty
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local string_to_join = ''
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for i, element in ipairs(helper.get_variable_array(array_name)) do
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if element[key_name] ~= nil or (not remove_empty) then
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if #string_to_join > 0 then
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string_to_join = string_to_join .. separator
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end
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string_to_join = string_to_join .. element[key_name]
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end
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end
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wesnoth.set_variable(name, string_to_join)
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end
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end
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