spacevim/bundle/plenary.nvim/lua/luassert/array.lua
JIe 2bb7059579
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init
2024-08-21 14:17:26 +08:00

71 lines
2.4 KiB
Lua

local assert = require('luassert.assert')
local say = require('say')
-- Example usage:
-- local arr = { "one", "two", "three" }
--
-- assert.array(arr).has.no.holes() -- checks the array to not contain holes --> passes
-- assert.array(arr).has.no.holes(4) -- sets explicit length to 4 --> fails
--
-- local first_hole = assert.array(arr).has.holes(4) -- check array of size 4 to contain holes --> passes
-- assert.equal(4, first_hole) -- passes, as the index of the first hole is returned
-- Unique key to store the object we operate on in the state object
-- key must be unique, to make sure we do not have name collissions in the shared state object
local ARRAY_STATE_KEY = "__array_state"
-- The modifier, to store the object in our state
local function array(state, args, level)
assert(args.n > 0, "No array provided to the array-modifier")
assert(rawget(state, ARRAY_STATE_KEY) == nil, "Array already set")
rawset(state, ARRAY_STATE_KEY, args[1])
return state
end
-- The actual assertion that operates on our object, stored via the modifier
local function holes(state, args, level)
local length = args[1]
local arr = rawget(state, ARRAY_STATE_KEY) -- retrieve previously set object
-- only check against nil, metatable types are allowed
assert(arr ~= nil, "No array set, please use the array modifier to set the array to validate")
if length == nil then
length = 0
for i in pairs(arr) do
if type(i) == "number" and
i > length and
math.floor(i) == i then
length = i
end
end
end
assert(type(length) == "number", "expected array length to be of type 'number', got: "..tostring(length))
-- let's do the actual assertion
local missing
for i = 1, length do
if arr[i] == nil then
missing = i
break
end
end
-- format arguments for output strings;
args[1] = missing
args.n = missing and 1 or 0
return missing ~= nil, { missing } -- assert result + first missing index as return value
end
-- Register the proper assertion messages
say:set("assertion.array_holes.positive", [[
Expected array to have holes, but none was found.
]])
say:set("assertion.array_holes.negative", [[
Expected array to not have holes, hole found at position: %s
]])
-- Register the assertion, and the modifier
assert:register("assertion", "holes", holes,
"assertion.array_holes.positive",
"assertion.array_holes.negative")
assert:register("modifier", "array", array)