ABC Language

ABC ia a typeless, dynamic language like python and ruby. It's just a toy language right now, just like the name suggests :).

Currently, a large part of codes are borrowed from crowbar language which is written by the Kazuya Maebashi.

Installation

Simply run make and everything is done.

You can set a environment envariable after making it.

export PATH=$PATH:$ABCLang

Test your installation

Create a file name hello.abc, put the following:

println("Hello, world\n");

Save it and run:

abclang hello.abc

If you see the "Hello, world" message then your installation is working.

Control structres

The control structed of ABC are related to C but differ in different way.

####if if a > 0 { println("if"); } else if a < 0 { println("else if""); } else { println("else"); } ####for C like for:

a = {1,2,3};
for i = 0; i < a.size(); i++ {
   print(a[i]);
}   

easier one:

#slice
a = {1, 2, 3};
for i : a {
    print(i);
}

n = 10;
# i will be set to zero automatically
# default step is one.
for i : n {
    print(i);
}

# set step to 2
for i : n : 2 {
    print(i);
}

Functions

Just like python, you don't need to worry about the return value and parameter type.

def calculate(n) {
    # sum will be set to zero the first you use it.
    for i : n {
        sum += i;
    }
    return sum;
}

multiple return:

def add_sub(a, b) {
    return a+b, a-b;
} 

Data

All the data will be set to zero automatically. ####slice s = [1,2,3]; b = s[:1]; c = s[:-1];

#two dimention slice
s2 = new_slice(2,3);
s2[1] = 5;

####map m = { "hello" : 1, "world" : 2, }; m["good"] = 3; for name, num : m { printf("name=$1, num = $2\n",name, num); } del m["good"];

Exception

try {
    zero = 0;
    a = 3 / zero;
} catch (e) {
    if e.type == DivisionByZeroException {
        println("opps, div by zero");
     } else {
        throw e;
     }
}

IO

Currently it only support fopen, fclose, fgets, fputs operations. It externs stdin, stdout and stderr as default fd. You can use it just like C.

# read from stdin
name = fgets(stdin, "what's you name? ")
printf("your name is $1", name);  

# write
try {
    file = fopen("diary", "w+");
    #write
    fputs(file, "what a great day");
} finnally {
    fclose(file);
}

# read
file = fopen(“diary”, "r+");
for line : file {
    print(line);
}

Contact

If you are interested in ABCLang, please feel free to email me: [email protected]. If you want to participate in developing this toy lanugage, just fork it and do what you want.

License MIT