mirror of
https://github.com/neovim/neovim.git
synced 2024-12-21 03:35:02 -07:00
720 lines
19 KiB
Lua
720 lines
19 KiB
Lua
-- Functions shared by Nvim and its test-suite.
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--
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-- These are "pure" lua functions not depending of the state of the editor.
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-- Thus they should always be available whenever nvim-related lua code is run,
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-- regardless if it is code in the editor itself, or in worker threads/processes,
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-- or the test suite. (Eventually the test suite will be run in a worker process,
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-- so this wouldn't be a separate case to consider)
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local vim = vim or {}
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--- Returns a deep copy of the given object. Non-table objects are copied as
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--- in a typical Lua assignment, whereas table objects are copied recursively.
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--- Functions are naively copied, so functions in the copied table point to the
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--- same functions as those in the input table. Userdata and threads are not
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--- copied and will throw an error.
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---
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---@param orig table Table to copy
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---@return table Table of copied keys and (nested) values.
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function vim.deepcopy(orig) end -- luacheck: no unused
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vim.deepcopy = (function()
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local function _id(v)
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return v
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end
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local deepcopy_funcs = {
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table = function(orig, cache)
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if cache[orig] then
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return cache[orig]
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end
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local copy = {}
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cache[orig] = copy
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local mt = getmetatable(orig)
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for k, v in pairs(orig) do
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copy[vim.deepcopy(k, cache)] = vim.deepcopy(v, cache)
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end
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return setmetatable(copy, mt)
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end,
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number = _id,
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string = _id,
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['nil'] = _id,
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boolean = _id,
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['function'] = _id,
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}
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return function(orig, cache)
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local f = deepcopy_funcs[type(orig)]
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if f then
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return f(orig, cache or {})
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else
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error('Cannot deepcopy object of type ' .. type(orig))
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end
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end
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end)()
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--- Splits a string at each instance of a separator.
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---
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---@see |vim.split()|
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---@see https://www.lua.org/pil/20.2.html
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---@see http://lua-users.org/wiki/StringLibraryTutorial
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---
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---@param s string String to split
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---@param sep string Separator or pattern
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---@param plain boolean If `true` use `sep` literally (passed to string.find)
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---@return function Iterator over the split components
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function vim.gsplit(s, sep, plain)
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vim.validate({ s = { s, 's' }, sep = { sep, 's' }, plain = { plain, 'b', true } })
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local start = 1
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local done = false
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local function _pass(i, j, ...)
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if i then
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assert(j + 1 > start, 'Infinite loop detected')
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local seg = s:sub(start, i - 1)
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start = j + 1
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return seg, ...
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else
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done = true
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return s:sub(start)
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end
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end
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return function()
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if done or (s == '' and sep == '') then
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return
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end
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if sep == '' then
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if start == #s then
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done = true
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end
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return _pass(start + 1, start)
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end
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return _pass(s:find(sep, start, plain))
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end
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end
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--- Splits a string at each instance of a separator.
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---
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--- Examples:
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--- <pre>
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--- split(":aa::b:", ":") --> {'','aa','','b',''}
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--- split("axaby", "ab?") --> {'','x','y'}
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--- split("x*yz*o", "*", {plain=true}) --> {'x','yz','o'}
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--- split("|x|y|z|", "|", {trimempty=true}) --> {'x', 'y', 'z'}
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--- </pre>
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---
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---@see |vim.gsplit()|
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---
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---@param s string String to split
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---@param sep string Separator or pattern
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---@param kwargs table Keyword arguments:
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--- - plain: (boolean) If `true` use `sep` literally (passed to string.find)
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--- - trimempty: (boolean) If `true` remove empty items from the front
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--- and back of the list
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---@return table List of split components
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function vim.split(s, sep, kwargs)
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local plain
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local trimempty = false
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if type(kwargs) == 'boolean' then
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-- Support old signature for backward compatibility
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plain = kwargs
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else
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vim.validate({ kwargs = { kwargs, 't', true } })
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kwargs = kwargs or {}
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plain = kwargs.plain
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trimempty = kwargs.trimempty
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end
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local t = {}
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local skip = trimempty
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for c in vim.gsplit(s, sep, plain) do
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if c ~= '' then
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skip = false
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end
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if not skip then
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table.insert(t, c)
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end
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end
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if trimempty then
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for i = #t, 1, -1 do
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if t[i] ~= '' then
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break
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end
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table.remove(t, i)
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end
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end
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return t
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end
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--- Return a list of all keys used in a table.
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--- However, the order of the return table of keys is not guaranteed.
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---
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---@see From https://github.com/premake/premake-core/blob/master/src/base/table.lua
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---
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---@param t table Table
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---@return table List of keys
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function vim.tbl_keys(t)
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assert(type(t) == 'table', string.format('Expected table, got %s', type(t)))
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local keys = {}
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for k, _ in pairs(t) do
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table.insert(keys, k)
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end
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return keys
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end
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--- Return a list of all values used in a table.
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--- However, the order of the return table of values is not guaranteed.
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---
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---@param t table Table
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---@return table List of values
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function vim.tbl_values(t)
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assert(type(t) == 'table', string.format('Expected table, got %s', type(t)))
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local values = {}
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for _, v in pairs(t) do
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table.insert(values, v)
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end
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return values
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end
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--- Apply a function to all values of a table.
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---
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---@param func function|table Function or callable table
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---@param t table Table
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---@return table Table of transformed values
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function vim.tbl_map(func, t)
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vim.validate({ func = { func, 'c' }, t = { t, 't' } })
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local rettab = {}
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for k, v in pairs(t) do
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rettab[k] = func(v)
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end
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return rettab
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end
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--- Filter a table using a predicate function
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---
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---@param func function|table Function or callable table
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---@param t table Table
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---@return table Table of filtered values
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function vim.tbl_filter(func, t)
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vim.validate({ func = { func, 'c' }, t = { t, 't' } })
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local rettab = {}
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for _, entry in pairs(t) do
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if func(entry) then
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table.insert(rettab, entry)
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end
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end
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return rettab
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end
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--- Checks if a list-like (vector) table contains `value`.
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---
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---@param t table Table to check
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---@param value any Value to compare
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---@return boolean `true` if `t` contains `value`
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function vim.tbl_contains(t, value)
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vim.validate({ t = { t, 't' } })
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for _, v in ipairs(t) do
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if v == value then
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return true
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end
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end
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return false
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end
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--- Checks if a table is empty.
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---
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---@see https://github.com/premake/premake-core/blob/master/src/base/table.lua
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---
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---@param t table Table to check
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---@return boolean `true` if `t` is empty
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function vim.tbl_isempty(t)
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assert(type(t) == 'table', string.format('Expected table, got %s', type(t)))
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return next(t) == nil
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end
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--- We only merge empty tables or tables that are not a list
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---@private
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local function can_merge(v)
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return type(v) == 'table' and (vim.tbl_isempty(v) or not vim.tbl_islist(v))
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end
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local function tbl_extend(behavior, deep_extend, ...)
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if behavior ~= 'error' and behavior ~= 'keep' and behavior ~= 'force' then
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error('invalid "behavior": ' .. tostring(behavior))
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end
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if select('#', ...) < 2 then
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error(
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'wrong number of arguments (given '
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.. tostring(1 + select('#', ...))
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.. ', expected at least 3)'
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)
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end
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local ret = {}
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if vim._empty_dict_mt ~= nil and getmetatable(select(1, ...)) == vim._empty_dict_mt then
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ret = vim.empty_dict()
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end
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for i = 1, select('#', ...) do
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local tbl = select(i, ...)
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vim.validate({ ['after the second argument'] = { tbl, 't' } })
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if tbl then
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for k, v in pairs(tbl) do
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if deep_extend and can_merge(v) and can_merge(ret[k]) then
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ret[k] = tbl_extend(behavior, true, ret[k], v)
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elseif behavior ~= 'force' and ret[k] ~= nil then
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if behavior == 'error' then
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error('key found in more than one map: ' .. k)
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end -- Else behavior is "keep".
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else
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ret[k] = v
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end
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end
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end
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end
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return ret
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end
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--- Merges two or more map-like tables.
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---
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---@see |extend()|
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---
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---@param behavior string Decides what to do if a key is found in more than one map:
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--- - "error": raise an error
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--- - "keep": use value from the leftmost map
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--- - "force": use value from the rightmost map
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---@param ... table Two or more map-like tables
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---@return table Merged table
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function vim.tbl_extend(behavior, ...)
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return tbl_extend(behavior, false, ...)
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end
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--- Merges recursively two or more map-like tables.
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---
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---@see |tbl_extend()|
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---
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---@param behavior string Decides what to do if a key is found in more than one map:
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--- - "error": raise an error
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--- - "keep": use value from the leftmost map
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--- - "force": use value from the rightmost map
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---@param ... table Two or more map-like tables
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---@return table Merged table
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function vim.tbl_deep_extend(behavior, ...)
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return tbl_extend(behavior, true, ...)
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end
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--- Deep compare values for equality
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---
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--- Tables are compared recursively unless they both provide the `eq` metamethod.
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--- All other types are compared using the equality `==` operator.
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---@param a any First value
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---@param b any Second value
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---@return boolean `true` if values are equals, else `false`
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function vim.deep_equal(a, b)
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if a == b then
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return true
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end
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if type(a) ~= type(b) then
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return false
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end
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if type(a) == 'table' then
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for k, v in pairs(a) do
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if not vim.deep_equal(v, b[k]) then
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return false
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end
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end
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for k, _ in pairs(b) do
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if a[k] == nil then
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return false
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end
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end
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return true
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end
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return false
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end
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--- Add the reverse lookup values to an existing table.
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--- For example:
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--- ``tbl_add_reverse_lookup { A = 1 } == { [1] = 'A', A = 1 }``
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---
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--- Note that this *modifies* the input.
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---@param o table Table to add the reverse to
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---@return table o
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function vim.tbl_add_reverse_lookup(o)
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local keys = vim.tbl_keys(o)
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for _, k in ipairs(keys) do
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local v = o[k]
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if o[v] then
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error(
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string.format(
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'The reverse lookup found an existing value for %q while processing key %q',
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tostring(v),
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tostring(k)
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)
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)
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end
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o[v] = k
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end
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return o
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end
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--- Index into a table (first argument) via string keys passed as subsequent arguments.
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--- Return `nil` if the key does not exist.
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---
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--- Examples:
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--- <pre>
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--- vim.tbl_get({ key = { nested_key = true }}, 'key', 'nested_key') == true
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--- vim.tbl_get({ key = {}}, 'key', 'nested_key') == nil
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--- </pre>
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---
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---@param o table Table to index
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---@param ... string Optional strings (0 or more, variadic) via which to index the table
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---
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---@return any Nested value indexed by key (if it exists), else nil
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function vim.tbl_get(o, ...)
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local keys = { ... }
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if #keys == 0 then
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return
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end
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for i, k in ipairs(keys) do
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if type(o[k]) ~= 'table' and next(keys, i) then
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return nil
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end
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o = o[k]
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if o == nil then
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return
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end
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end
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return o
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end
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--- Extends a list-like table with the values of another list-like table.
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---
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--- NOTE: This mutates dst!
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---
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---@see |vim.tbl_extend()|
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---
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---@param dst table List which will be modified and appended to
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---@param src table List from which values will be inserted
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---@param start number Start index on src. Defaults to 1
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---@param finish number Final index on src. Defaults to `#src`
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---@return table dst
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function vim.list_extend(dst, src, start, finish)
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vim.validate({
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dst = { dst, 't' },
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src = { src, 't' },
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start = { start, 'n', true },
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finish = { finish, 'n', true },
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})
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for i = start or 1, finish or #src do
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table.insert(dst, src[i])
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end
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return dst
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end
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--- Creates a copy of a list-like table such that any nested tables are
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--- "unrolled" and appended to the result.
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---
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---@see From https://github.com/premake/premake-core/blob/master/src/base/table.lua
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---
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---@param t table List-like table
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---@return table Flattened copy of the given list-like table
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function vim.tbl_flatten(t)
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local result = {}
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local function _tbl_flatten(_t)
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local n = #_t
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for i = 1, n do
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local v = _t[i]
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if type(v) == 'table' then
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_tbl_flatten(v)
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elseif v then
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table.insert(result, v)
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end
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end
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end
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_tbl_flatten(t)
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return result
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end
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--- Tests if a Lua table can be treated as an array.
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---
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--- Empty table `{}` is assumed to be an array, unless it was created by
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--- |vim.empty_dict()| or returned as a dict-like |API| or Vimscript result,
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--- for example from |rpcrequest()| or |vim.fn|.
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---
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---@param t table Table
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---@return boolean `true` if array-like table, else `false`
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function vim.tbl_islist(t)
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if type(t) ~= 'table' then
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return false
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end
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local count = 0
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for k, _ in pairs(t) do
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if type(k) == 'number' then
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count = count + 1
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else
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return false
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end
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end
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if count > 0 then
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return true
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else
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-- TODO(bfredl): in the future, we will always be inside nvim
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-- then this check can be deleted.
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if vim._empty_dict_mt == nil then
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return nil
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end
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return getmetatable(t) ~= vim._empty_dict_mt
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end
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end
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--- Counts the number of non-nil values in table `t`.
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---
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--- <pre>
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--- vim.tbl_count({ a=1, b=2 }) => 2
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--- vim.tbl_count({ 1, 2 }) => 2
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--- </pre>
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---
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---@see https://github.com/Tieske/Penlight/blob/master/lua/pl/tablex.lua
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---@param t table Table
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---@return number Number of non-nil values in table
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function vim.tbl_count(t)
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vim.validate({ t = { t, 't' } })
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local count = 0
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for _ in pairs(t) do
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count = count + 1
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end
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return count
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end
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--- Creates a copy of a table containing only elements from start to end (inclusive)
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---
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---@param list table Table
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---@param start number Start range of slice
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---@param finish number End range of slice
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---@return table Copy of table sliced from start to finish (inclusive)
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function vim.list_slice(list, start, finish)
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local new_list = {}
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for i = start or 1, finish or #list do
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new_list[#new_list + 1] = list[i]
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end
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return new_list
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end
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--- Trim whitespace (Lua pattern "%s") from both sides of a string.
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---
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---@see https://www.lua.org/pil/20.2.html
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---@param s string String to trim
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---@return string String with whitespace removed from its beginning and end
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function vim.trim(s)
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vim.validate({ s = { s, 's' } })
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return s:match('^%s*(.*%S)') or ''
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end
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--- Escapes magic chars in a Lua pattern.
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---
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---@see https://github.com/rxi/lume
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---@param s string String to escape
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---@return string %-escaped pattern string
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function vim.pesc(s)
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vim.validate({ s = { s, 's' } })
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return s:gsub('[%(%)%.%%%+%-%*%?%[%]%^%$]', '%%%1')
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end
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--- Tests if `s` starts with `prefix`.
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---
|
|
---@param s string String
|
|
---@param prefix string Prefix to match
|
|
---@return boolean `true` if `prefix` is a prefix of `s`
|
|
function vim.startswith(s, prefix)
|
|
vim.validate({ s = { s, 's' }, prefix = { prefix, 's' } })
|
|
return s:sub(1, #prefix) == prefix
|
|
end
|
|
|
|
--- Tests if `s` ends with `suffix`.
|
|
---
|
|
---@param s string String
|
|
---@param suffix string Suffix to match
|
|
---@return boolean `true` if `suffix` is a suffix of `s`
|
|
function vim.endswith(s, suffix)
|
|
vim.validate({ s = { s, 's' }, suffix = { suffix, 's' } })
|
|
return #suffix == 0 or s:sub(-#suffix) == suffix
|
|
end
|
|
|
|
--- Validates a parameter specification (types and values).
|
|
---
|
|
--- Usage example:
|
|
--- <pre>
|
|
--- function user.new(name, age, hobbies)
|
|
--- vim.validate{
|
|
--- name={name, 'string'},
|
|
--- age={age, 'number'},
|
|
--- hobbies={hobbies, 'table'},
|
|
--- }
|
|
--- ...
|
|
--- end
|
|
--- </pre>
|
|
---
|
|
--- Examples with explicit argument values (can be run directly):
|
|
--- <pre>
|
|
--- vim.validate{arg1={{'foo'}, 'table'}, arg2={'foo', 'string'}}
|
|
--- => NOP (success)
|
|
---
|
|
--- vim.validate{arg1={1, 'table'}}
|
|
--- => error('arg1: expected table, got number')
|
|
---
|
|
--- vim.validate{arg1={3, function(a) return (a % 2) == 0 end, 'even number'}}
|
|
--- => error('arg1: expected even number, got 3')
|
|
--- </pre>
|
|
---
|
|
--- If multiple types are valid they can be given as a list.
|
|
--- <pre>
|
|
--- vim.validate{arg1={{'foo'}, {'table', 'string'}}, arg2={'foo', {'table', 'string'}}}
|
|
--- => NOP (success)
|
|
---
|
|
--- vim.validate{arg1={1, {'string', table'}}}
|
|
--- => error('arg1: expected string|table, got number')
|
|
---
|
|
--- </pre>
|
|
---
|
|
---@param opt table Names of parameters to validate. Each key is a parameter
|
|
--- name; each value is a tuple in one of these forms:
|
|
--- 1. (arg_value, type_name, optional)
|
|
--- - arg_value: argument value
|
|
--- - type_name: string|table type name, one of: ("table", "t", "string",
|
|
--- "s", "number", "n", "boolean", "b", "function", "f", "nil",
|
|
--- "thread", "userdata") or list of them.
|
|
--- - optional: (optional) boolean, if true, `nil` is valid
|
|
--- 2. (arg_value, fn, msg)
|
|
--- - arg_value: argument value
|
|
--- - fn: any function accepting one argument, returns true if and
|
|
--- only if the argument is valid. Can optionally return an additional
|
|
--- informative error message as the second returned value.
|
|
--- - msg: (optional) error string if validation fails
|
|
function vim.validate(opt) end -- luacheck: no unused
|
|
|
|
do
|
|
local type_names = {
|
|
['table'] = 'table',
|
|
t = 'table',
|
|
['string'] = 'string',
|
|
s = 'string',
|
|
['number'] = 'number',
|
|
n = 'number',
|
|
['boolean'] = 'boolean',
|
|
b = 'boolean',
|
|
['function'] = 'function',
|
|
f = 'function',
|
|
['callable'] = 'callable',
|
|
c = 'callable',
|
|
['nil'] = 'nil',
|
|
['thread'] = 'thread',
|
|
['userdata'] = 'userdata',
|
|
}
|
|
|
|
local function _is_type(val, t)
|
|
return type(val) == t or (t == 'callable' and vim.is_callable(val))
|
|
end
|
|
|
|
---@private
|
|
local function is_valid(opt)
|
|
if type(opt) ~= 'table' then
|
|
return false, string.format('opt: expected table, got %s', type(opt))
|
|
end
|
|
|
|
for param_name, spec in pairs(opt) do
|
|
if type(spec) ~= 'table' then
|
|
return false, string.format('opt[%s]: expected table, got %s', param_name, type(spec))
|
|
end
|
|
|
|
local val = spec[1] -- Argument value
|
|
local types = spec[2] -- Type name, or callable
|
|
local optional = (true == spec[3])
|
|
|
|
if type(types) == 'string' then
|
|
types = { types }
|
|
end
|
|
|
|
if vim.is_callable(types) then
|
|
-- Check user-provided validation function
|
|
local valid, optional_message = types(val)
|
|
if not valid then
|
|
local error_message =
|
|
string.format('%s: expected %s, got %s', param_name, (spec[3] or '?'), tostring(val))
|
|
if optional_message ~= nil then
|
|
error_message = error_message .. string.format('. Info: %s', optional_message)
|
|
end
|
|
|
|
return false, error_message
|
|
end
|
|
elseif type(types) == 'table' then
|
|
local success = false
|
|
for i, t in ipairs(types) do
|
|
local t_name = type_names[t]
|
|
if not t_name then
|
|
return false, string.format('invalid type name: %s', t)
|
|
end
|
|
types[i] = t_name
|
|
|
|
if (optional and val == nil) or _is_type(val, t_name) then
|
|
success = true
|
|
break
|
|
end
|
|
end
|
|
if not success then
|
|
return false,
|
|
string.format(
|
|
'%s: expected %s, got %s',
|
|
param_name,
|
|
table.concat(types, '|'),
|
|
type(val)
|
|
)
|
|
end
|
|
else
|
|
return false, string.format('invalid type name: %s', tostring(types))
|
|
end
|
|
end
|
|
|
|
return true, nil
|
|
end
|
|
|
|
function vim.validate(opt)
|
|
local ok, err_msg = is_valid(opt)
|
|
if not ok then
|
|
error(err_msg, 2)
|
|
end
|
|
end
|
|
end
|
|
--- Returns true if object `f` can be called as a function.
|
|
---
|
|
---@param f any Any object
|
|
---@return boolean `true` if `f` is callable, else `false`
|
|
function vim.is_callable(f)
|
|
if type(f) == 'function' then
|
|
return true
|
|
end
|
|
local m = getmetatable(f)
|
|
if m == nil then
|
|
return false
|
|
end
|
|
return type(m.__call) == 'function'
|
|
end
|
|
|
|
return vim
|
|
-- vim:sw=2 ts=2 et
|