85 lines
2.2 KiB
Lua
85 lines
2.2 KiB
Lua
local M = {}
|
|
--- this function will split a string into a table of tokens, like it would
|
|
--- be passed into the `argv` of a program that was executed from the commandline
|
|
---
|
|
--- @param raw string string of cli args that should be split
|
|
--- @return table tokens args as a table
|
|
M.tokenize_args = function(raw)
|
|
-- NOTE: string.gmatch is does not use regex, but a smaller pattern matcher!
|
|
-- A complete regex parser would be larger than lua itself. See
|
|
-- [Programming in Lua 20.2](https://www.lua.org/pil/20.2.html).
|
|
--
|
|
-- Notable differences:
|
|
-- '-' is ungreedy wildcard
|
|
-- '*?' does not work
|
|
-- '|' is not or
|
|
--
|
|
-- This means we're better of implementing the lexer with an algorithm.
|
|
local t = {}
|
|
local current = ""
|
|
local in_str = false
|
|
local str_seek
|
|
for c in string.gmatch(raw, ".") do -- iterate through all chars
|
|
if c == " " and not in_str then
|
|
if string.len(current) > 0 then
|
|
table.insert(t, current)
|
|
current = ""
|
|
end
|
|
elseif c == '"' and not in_str then
|
|
in_str = true
|
|
str_seek = '"'
|
|
elseif c == "'" and not in_str then
|
|
in_str = true
|
|
str_seek = "'"
|
|
elseif c == str_seek and in_str then
|
|
in_str = false
|
|
table.insert(t, current)
|
|
current = ""
|
|
else
|
|
current = current .. c
|
|
end
|
|
end
|
|
if string.len(current) > 0 then
|
|
table.insert(t, current)
|
|
end
|
|
return t
|
|
end
|
|
|
|
--- dumps a variable into a string, so it can be printed. This is meant for
|
|
--- debug prints
|
|
--- @param t any variable
|
|
--- @return string t_dumped t dumped to string
|
|
M.dump = function(t)
|
|
if type(t) == "table" then
|
|
local s = "{ "
|
|
for k, v in pairs(t) do
|
|
if type(k) ~= "number" then
|
|
k = '"' .. k .. '"'
|
|
end
|
|
if k ~= 1 then
|
|
s = s .. ", "
|
|
end
|
|
s = s .. "[" .. k .. "] = '" .. M.dump(v) .. "'"
|
|
end
|
|
return s .. " }"
|
|
else
|
|
return tostring(t)
|
|
end
|
|
end
|
|
|
|
--- Try to require a module
|
|
--- @param module string module name
|
|
--- @return boolean available is the module available?
|
|
--- @return any loaded_module the loaded module if it is available
|
|
M.try_require = function(module)
|
|
local available, loaded_module = pcall(require, module)
|
|
if not available then
|
|
return available, nil
|
|
else
|
|
return available, loaded_module
|
|
end
|
|
end
|
|
|
|
return M
|
|
|