Jua

Introduction

Jua is a simplified Lua (5.3) implementation written in Java.

The purpose of building this project is to learn:

• Data Structure
• Register-based Virtual Machine & Instruction Set Design
• Compilers
• Lua & Standard Libraries

Features

• Virtual Machine: (Instruction Set & Runner)
• Compiler: Lexer, AST Parser & Code Generator
• Standard Libraries
• Metaprogramming

To-Do List

• Label & Goto statement
• Userdata
• Coroutines Support
• Garbage Collector
• Standard Libraries:
  • basic library
  • mathematical functions
  • string manipulation
  • package library
  • input and output
  • basic UTF-8 support
  • debug facilities
  • table manipulation
  • operating system facilities
  • coroutine library
• REPL
• Other interesting features

Standard Libraries

Lua 5.3 Reference Manual

Basic

No.	Function	Synopsis
0	print	print (···)
1	assert	assert (v [, message])
2	error	error (message [, level])
3	select	select (index, ···)
4	ipairs	ipairs (t)
5	pairs	pairs (t)
6	next	next (table [, index])
7	load	load (chunk [, chunkname [, mode [, env]]])
8	loadfile	loadfile ([filename [, mode [, env]]])
9	dofile	dofile ([filename])
10	pcall	pcall (f [, arg1, ···])
11	xpcall	xpcall (f, msgh [, arg1, ···])
12	getmetatable	getmetatable (object)
13	setmetatable	setmetatable (table, metatable)
14	rawequal	rawequal (v1, v2)
15	rawlen	rawlen (v)
16	rawget	rawget (table, index)
17	rawset	rawset (table, index, value)
18	type	type (v)
19	tostring	tostring (v)
20	tonumber	tonumber (e [, base])

Math

No.	Function	Synopsis
0	random	math.random ([m [, n]])
1	randomseed	math.randomseed (x)
2	max	math.max (x, ···)
3	min	math.min (x, ···)
4	exp	math.exp (x)
5	log	math.log (x [, base])
6	deg	math.deg (x)
7	rad	math.rad (x)
8	sin	math.sin (x)
9	cos	math.cos (x)
10	tan	math.tan (x)
11	asin	math.asin (x)
12	acos	math.acos (x)
13	atan	math.atan (y [, x])
14	ceil	math.ceil (x)
15	floor	math.floor (x)
16	abs	math.abs (x)
17	sqrt	math.sqrt (x)
18	fmod	math.abs (x)
19	modf	math.modf (x)
20	ult	math.ult (m, n)
21	tointeger	math.tointeger (x)
22	type	math.type (x)
23	pi	The value of π.
24	huge	A value larger than any other numeric value.
25	maxinteger	An integer with the maximum value for an integer.
26	mininteger	An integer with the minimum value for an integer.

String

No.	Function	Synopsis
0	len	string.len (s)
1	rep	string.rep (s, n [, sep])
2	lower	string.lower (s)
3	upper	string.upper (s)

...

Modules

No.	Function	Synopsis
0	require	require (modname)
1	searchers	package.searchers
2	searchpath	package.searchpath (name, path [, sep [, rep]])

...

Example

Dependencies

• JDK 1.8+
• Maven 3+

Build Project

mvn clean package

Write and Run Script

sum.lua

function sum()
    local s = 0
    for i = 1, 100 do
        if i % 2 == 0 then
            s = s + math.sqrt(i)
        end
    end
    return s
end
print(sum())

$ java -jar jua-5.3.5-alpha.jar sum.lua

             ,---._
           .-- -.' \
           |    |   :
           |    |   |         ,--,
           |    |   |       ,'_ /|
           |    |   |  .--. |  | :    ,--.--.
           |    |   |,'_ /| :  . |   /       \
           |    |   ||  ' | |  . .  .--.  .-. |
       ___ |    |   ||  | ' |  | |   \__\/| . .
     /    /\    |   ||  | : ;  ; |   ," .--.; |
    /  ../  `..-    ,|  |  `--'   \ /  /  ,.  |
    \    \         ; :  ,      .-./;  :  |..'  \
     \    \      ,'   `--`----'    |  ,     .-./
      "---....--'                   `--`---'
    :: jua ::                      (5.3.5-alpha)

338.048

Links

• lua.go
• Lua 5.3 Reference Manual
• Lua 5.3 Test suites
• ...

License

See LICENSE file.