Similarities with Go
Let’s start off by listing some of the characteristics shared between Go and ooc:
- Assignment using the declare-assign operator
:= - Multiple return values from functions (via Tuples in ooc)
- Support for writing platform-specific code (Build Constraints in Go, Version blocks in ooc)
- Garbage collection (Disable with
GOGC=offin Go and--gc=offin rock)
How is it different from Go?
- Member access is performed with a space instead of a dot
"foo" println() - Chars instead of Runes
- Inline string interpolation inspired by Ruby
- It has a Ternary operator
- Operator overloading is possible
- Classes (With inheritance)
- Implicit returns
- Configurable entry point (You can use something else than main)
- Inferred argument types when creating closures
- while loops
- Exceptions
- Generics!
Getting started
I initially installed rock using Homebrew, but then had some issues when compiling sam.
To install the rock compiler, simply clone the git repo and run make rescue:
mkdir -p ~/Work/ooc
cd ~/Work/ooc
git clone https://github.com/fasterthanlime/rock.git
cd rock
make rescue
Now you need to set some environment variables in your .bashrc
# ooc programming language
export OOC_LIBS=$HOME/Work/ooc
export PATH=$PATH:$OOC_LIBS/sam:$OOC_LIBS/rock/bin
If everything is set up properly, then you should be able to run rock like this:
rock -V
rock 0.9.10-head codename sapphire, built on Fri Jan 16 04:12:40 2015
We also want to install the sam package manager:
cd ~/Work/ooc
git clone https://github.com/fasterthanlime/sam.git
cd sam
rock -v
You should now be able to update sam by just by typing:
sam update
Pulling repository /Users/peter/Work/ooc/sam
> Current branch master is up to date.
Recompiling sam
> Cleaning up outpath and .libs
> [ OK ]
To get syntax highlighting in Vim using Vundle just add Plugin 'fasterthanlime/ooc.vim'
Example
A simple wget like tool written in ooc
# First you need to install curl
brew install curl
brew link curl --force
# Then clone the ooc bindings using sam
sam clone curl
cd $OOC_LIBS
mkdir wget
cd wget
vim wget.ooc
wget.ooc
use curl
import curl/Curl
import io/FileWriter, structs/ArrayList
writecb: func(buffer: Pointer, size: SizeT, nmemb: SizeT, fw: FileWriter) {
fw write(buffer as CString, nmemb)
}
main: func(args: ArrayList<String>) {
if(args size <= 1) {
"Usage: %s URL output.html\n" printfln(args[0])
exit(0)
}
url := args get(1)
fw := FileWriter new(args[2])
handle := Curl new()
handle setOpt(CurlOpt url, url toCString())
handle setOpt(CurlOpt writeData, fw)
handle setOpt(CurlOpt writeFunction, writecb)
handle perform()
handle cleanup()
fw close()
}
Compile it
rock -v -pr -O3 --gc=off wget.ooc
And run it
./wget http://c7.se/ test.html
