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prevent double execution of on_event.lua

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makes it safe to dofile("on_event.lua")

(cherry-picked from commit 6010ffe98e)
This commit is contained in:
V N 2018-09-16 22:30:50 +03:00 • committed by gfgtdf
parent 7e4d12e10d
commit 20177dbe5e
1 changed files with 10 additions and 3 deletions
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13
data/lua/on_event.lua
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@ -3,19 +3,25 @@ local utils = wesnoth.require "wml-utils"
-- so you have to call this function from a toplevel lua tag or from a preload event.
-- It is also not possible to use this for first_time_only=yes events.
if rawget(_G, "core_on_event") then
return rawget(_G, "core_on_event") -- prevent double execution
end
local event_handlers = {}
local old_on_event = wesnoth.game_events.on_event or function(eventname) end
wesnoth.game_events.on_event = function(eventname)
old_on_event(eventname)
local context = nil
for k,v in pairs(event_handlers[eventname] or {}) do
for _, entry in pairs(event_handlers[eventname] or {}) do
if context == nil then
context = wesnoth.current.event_context
end
v.h(context)
entry.h(context)
end
end
local function on_event(eventname, arg1, arg2)
if string.match(eventname, ",") then
for elem in utils.split(eventname or "") do
@ -35,7 +41,7 @@ local function on_event(eventname, arg1, arg2)
event_handlers[eventname] = event_handlers[eventname] or {}
local eh = event_handlers[eventname]
table.insert(eh, { h = handler, p = priority})
-- sort it.
-- prioritize last entry
for i = #eh - 1, 1, -1 do
if eh[i].p < eh[i + 1].p then
eh[i], eh[i + 1] = eh[i + 1], eh[i]
@ -43,4 +49,5 @@ local function on_event(eventname, arg1, arg2)
end
end
core_on_event = on_event
return on_event