JexCompiler

A compiler for the simple programming language that I've been working on.

I wanted to learn about compilers and ended up reading Crafting Interpreters and writing this compiler and a virtual machine.

It supports

• ints, booleans
• strings
• addition, multiplication, division, subtraction, concatenation
• logical operations
• local and global variables
• if, if-else, while loops
• functions
• build-in functions: input, readLine, int, fact
• objects and object() function
• linked lists with normal API
• closures

How to run Jex

To run Jex code you need to run

1. Download JexCompiler-<version>.jar from the latest release
2. Run

java -jar JexCompiler-<version>.jar path/to/code.txt path/to/output.bytecode

3. Run path/to/output.bytecode with jex_vm.

Examples

WARNING: Be very careful with newline characters, the parser is not finished yet 😎.

Ints, booleans, strings

1 + 2 * 5 - (10 / 2)
true && false
true || false
"a" + "b"

Variables

var globalVariable = 1
{
  var localVariable = 2 
}

Read and write

var readFromTerminal = readLine()
println("Hello World")

var readInt = int(readLine())

if (readInt == null) {
    println("Failed to parse int")
} else {
    println("Success")
}

Ifs and whiles

var name = readLine()
if (name == "Emir") {
    println("Hehe")
} else {
    println("Hey")
}

if (name == "emir") {
    println("You should capitalize your name, emir")
}

while(true) {
    println("Working")
}

Functions

fn greet(name) {
    println("Hello, " + name)
}

println("Whats your name?")
greet(readLine())

Functions are just regular values

var a = println
println(a)

Objects

Firstly, you have to create an empty object and then add some properties.

var person = object()
person.name = "Emir"

println(person.name)

Linked list example.

You can find some examples of Jex code in the resources directory.