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local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local clear = n.clear
local exec_lua = n.exec_lua
local eq = t.eq
describe('vim.func._memoize', function()
before_each(clear)
it('caches function results based on their parameters', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize('concat', function(arg1, arg2)
_G.count = _G.count + 1
return arg1 + arg2
end)
collectgarbage('stop')
adder(3, -4)
adder(3, -4)
adder(3, -4)
adder(3, -4)
adder(3, -4)
collectgarbage('restart')
]])
eq(1, exec_lua([[return _G.count]]))
end)
it('caches function results using a weak table by default', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize('concat-2', function(arg1, arg2)
_G.count = _G.count + 1
return arg1 + arg2
end)
adder(3, -4)
collectgarbage()
adder(3, -4)
collectgarbage()
adder(3, -4)
]])
eq(3, exec_lua([[return _G.count]]))
end)
it('can cache using a strong table', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize('concat-2', function(arg1, arg2)
_G.count = _G.count + 1
return arg1 + arg2
end, false)
adder(3, -4)
collectgarbage()
adder(3, -4)
collectgarbage()
adder(3, -4)
]])
eq(1, exec_lua([[return _G.count]]))
end)
it('can clear a single cache entry', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize(function(arg1, arg2)
return tostring(arg1) .. '%%' .. tostring(arg2)
end, function(arg1, arg2)
_G.count = _G.count + 1
return arg1 + arg2
end)
collectgarbage('stop')
adder(3, -4)
adder(3, -4)
adder(3, -4)
adder(3, -4)
adder(3, -4)
adder:clear(3, -4)
adder(3, -4)
collectgarbage('restart')
]])
eq(2, exec_lua([[return _G.count]]))
end)
it('can clear the entire cache', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize(function(arg1, arg2)
return tostring(arg1) .. '%%' .. tostring(arg2)
end, function(arg1, arg2)
_G.count = _G.count + 1
return arg1 + arg2
end)
collectgarbage('stop')
adder(1, 2)
adder(3, -4)
adder(1, 2)
adder(3, -4)
adder(1, 2)
adder(3, -4)
adder:clear()
adder(1, 2)
adder(3, -4)
collectgarbage('restart')
]])
eq(4, exec_lua([[return _G.count]]))
end)
it('can cache functions that return nil', function()
exec_lua([[
_G.count = 0
local adder = vim.func._memoize('concat', function(arg1, arg2)
_G.count = _G.count + 1
return nil
end)
collectgarbage('stop')
adder(1, 2)
adder(1, 2)
adder(1, 2)
adder(1, 2)
adder:clear()
adder(1, 2)
collectgarbage('restart')
]])
eq(2, exec_lua([[return _G.count]]))
end)
end)
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