A library to parse and execute custom ASM.

It is a light‑weight Lua library that lets you define, parse and later execute a custom assembly‑like language.
And the library is deliberately minimal:

• No external dependencies – pure Lua 5.1+.
• Pluggable instruction set – you decide which mnemonics exist and how their operands are interpreted.
• Configurable syntax – label delimiters, immediate prefixes, register prefixes, etc., are all driven by a settings table.
• Tokenizer abstraction – you can feed source from a string, a file, or any other stream by providing a get_next_line method.
• Execute the code - you can also define the behaviour of the instruction and with that execute this code.

Because LuASM is a single Lua file, installation is straightforward:

# Clone the repository (or copy the file into your project)
git clone https://github.com/quickwrite/luasm.git

Or, if you just need the file:

-- In your project directory
luasm.lua   # <-- the file you just saw

No external libraries are required; the code runs on any Lua interpreter (5.1, 5.2, 5.3, LuaJIT, etc.).

local LuASM = require("luasm")

-- 1. Define the instruction set
local instructions = {
    LuASM.instruction("mov", {"imm", "reg"}, {}),
    LuASM.instruction("mov", {"reg", "reg"}, {}),
    LuASM.instruction("add", {"reg", "reg"}, {}),
    LuASM.instruction("jmp", {"label"}, {}),
}

-- 2. Create a runner (use default settings)
local asm = LuASM:new(instructions, {})

-- 3. Tokenize a source string
local src = [[
start:  mov 10 r0
        add  r0 r1
        jmp  start
]]
local tokenizer = asm:string_tokenizer(src)

-- 4. Parse
local result = asm:parse(tokenizer)

print("Lines parsed:", result.parsed_lines)
for name, info in pairs(result.labels) do
    print("Label: " .. name .. " -> line: " .. info.location)
end

for i, instr in ipairs(result.instructions) do
    print(i, instr.op)   -- currently just the instruction name
end

Which should result in something like this:

Lines parsed:   4
Label: start -> line:   1
1       mov
2       add
3       jmp

To see other examples, they can be found in the examples/ directory. To execute them the README inside this directory should be followed.

These examples are numbered so that they can be viewed in sequential order.

This project is currently in Version 0.1.0. This is the first version that can actively be used.

LuASM is released under the MIT License – you are free to use, modify, and distribute it in your projects. See the LICENSE file for the full text.