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Very simple (non-debug) hook library for Lua.
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| -- | |
| -- hook.lua | |
| -- | |
| -- Written by [aka]bomb, 2022 | |
| -- | |
| -- Permission is hereby granted, free of charge, to any person obtaining a copy of | |
| -- this software and associated documentation files (the "Software"), to deal in | |
| -- the Software without restriction, including without limitation the rights to | |
| -- use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies | |
| -- of the Software, and to permit persons to whom the Software is furnished to do | |
| -- so, subject to the following conditions: | |
| -- | |
| -- The above copyright notice and this permission notice shall be included in all | |
| -- copies or substantial portions of the Software. | |
| -- | |
| -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| -- SOFTWARE. | |
| -- | |
| local hook = {} | |
| local error = error | |
| local print = print | |
| local string_format = string.format | |
| local tostring = tostring | |
| hook.hooks = {} | |
| local hook_hooks = hook.hooks | |
| function hook.add(eventname, hookname, func) | |
| if type(func) ~= "function" then | |
| error("bad argument #3 (function expected, got " .. type(func) .. ')') | |
| end | |
| local ehooks = hook_hooks[eventname] | |
| if ehooks == nil then | |
| hook_hooks[eventname] = { | |
| { hookname, func } | |
| } | |
| else | |
| table.insert(ehooks, { hookname, func }) | |
| end | |
| end | |
| function hook.call(eventname, ...) | |
| local ehooks = hook_hooks[eventname] | |
| if ehooks == nil then return end | |
| for i=1,#ehooks do | |
| local v = ehooks[i][2](...) | |
| if v ~= nil then return v end | |
| end | |
| end | |
| function hook.remove(eventname, hookname) | |
| local ehooks = hook_hooks[eventname] | |
| if ehooks == nil then return end | |
| for i=1,#ehooks do | |
| if ehooks[i][1] == hookname then | |
| ehooks[i] = nil | |
| break | |
| end | |
| end | |
| end | |
| function hook.print(eventname) | |
| local ehooks = hook_hooks[eventname] | |
| if ehooks == nil then return end | |
| if #ehooks == 0 then | |
| print("event '" .. eventname .. "' has no attached hooks") | |
| return | |
| end | |
| for i=1,#ehooks do | |
| local h = ehooks[i] | |
| print(string_format("%d.\t%s\t%s", i, tostring(h[1]), tostring(h[2]))) | |
| end | |
| end | |
| return hook |
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