# Hexo
Tiny binary writer utility, just enough for you
## Installation
```bash
cargo install hexo
```
## CLI
### Compile
Takes `source` file in hexo format and compiles it to binary file `output`
```bash
hexo compile --source <path to source> --output <path to output>
```
## Syntax
### Emitter
To emit a byte use glyph '>' fallowed by byte value:
```hexo
> 0a // by default numbers are interpreted as hexadecimal, will emit decimal 10
> 'HelloWorld' // will emit utf-8 bytes of 'HelloWorld' string
```
### Constants
To declare a constant use glyph '$' fallowed by constant name and value:
```hexo
$ class_name 'HelloWorld'
```
Then you can use it as if you used hex or binary string by prefixing it with '$':
```hexo
> $class_name
```
### Calling Functions
To call a function use glyph '#' fallowed by function name and arguments:
```hexo
> #len('HelloWorld') // will emit length of 'HelloWorld' in bytes (0a)
```
### Example
Let's write _'HelloWorld'_ Java class bytecode:
```hexo
$ class_name 'HelloWorld'
$ object_superclass_name 'java/lang/Object'
> cafe babe // Magic number
> 0000 0034 // Java Bytecode version
> 0005 // Constant pool size
> 0700 02 // Class at index 2
> 0100 #len($class_name) $class_name
> 0700 04 // Class at index 4
> 0100 #len($object_superclass_name) $object_superclass_name
> 0021 // Supper public
> 0001 0003 // Class pointers
> 0000 0000 0000 0000 // No interfaces, fields, methods, attributes
```