Kalang is a static type-safe and null-safe language base on jvm with flexible syntax.
- static type-safe
- null safe
- auto type
- flexible syntax
- compatible with other jvm-based language like java,groovy and so on.
requirements:
- jdk8
- gradle
clone the source,and run
>gradle installDist
add the pathbuild/install/kalang/bin to your PATH environment variable
> kalang -gui
> kalang SOURCE_FILE
For example:kalang Helloworld.kl would compile Helloworld.kl in current directory.
More usages please run
> kalang -h
var s = "Hello,world!";
println(s);
More examples could be found in examples directory.
#IDE plugin support
#License
MIT
You don't have to declare package name and class name in the code.Kalang use the directory name as package name and the file name as class name.For example,the file /src/foo/bar/Helloworld.kl means that the package name is foo.bar , the main class name is Helloworld and the full class name is foo.bar.Helloworld,if the source root is /src.
import foo.bar.Helloworld;//normal import
import foo.bar.HelloKalang as KL;//use alias
import foo.bar.*;
define a normal class:
//define a class,default modifier is public
class{
//declare fields and methods
}
define a generic class:
class<T>{
//...
}
extend and implement:
class extends Object implements List<String>{
//...
}
write as a script:
//declare methods or code statements
System.out.print("Hello,world");
int sum(int a,int b){
return a+b;
}
int a;
int b=2;
var c = 3;//type is inferred,here the type of c is int
var d = String.format("%d",4);//type is String
var name = "kalang";
println( "hello,${name}!" );//output:hello,kalang!
for loop:
for(int i=0;i<9;i++){
//do Some Thing
}
foreach loop
foreach([1,2,3] as i,v){
println("index:" + i + ",value:"+v);
}
loop invoke
var arr = ["a","ab","abc"];
var lens = arr*.length();//lens will be [1,2,3]
while loop:
while(expression){
//do Some Thing
}
do loop:
do{
//do some thing
}while(expression);
//line comment
/*
multi-line comment
*/
int[] arr = new int[10];//length is 10
int[] arr2 = new int[]{1,2,3};arr2 is initialized and it's length is 3
or
var intArray = [1,2,3];//int[]
var integerArray= <Integer>[1,2,3];//Integer[]
var stringArray = ["hello","world"];//String[]
var objectMap = [name:"kalang",year:2016];//Map<Object,Object>
var stringMap = <String,String>[name:"kalang",type:"language"];//Map<String,String>
var ov = objectMap.get("name");//ov is Object type
var sv = stringMap.get("name");sv is String type
void hello(String? name){
name.length();//compile error:name may be null
if(name!=null){
name.length();//compile passed:name is null checked
}
}
Object s = "hello";
if(s instanceof String){
s.chars();//the type of s is changed from Object to String automatically
}