BluLang

• Programming language based on Go and supports Vietnamese language syntax
• Example:

; this is a single line comment

; 'if' is an expression so it can stand alone or be assigned
; example of conditional statement
let a = if 10 != 10 {
    11
} else {
    12
}
; the last statement is always returned as a value

let b = 0

; 'while' is also an expression so it can stand alone or be assigned
; 'c' will be 10, 'b' will be 10
; example of looping statement
let c = while b != 10 {
    b = b + 1
}

; example of normal function declaration
fn minus(num1, num2, num3) {
    num1 - num2 - num3
}

; example of functions as a variable
let sum = fn (num1, num2, num3) {
    num1 + num2 + num3
}

let d = sum(a,b,c)
print("Hello world")
print(d) ; final result is 32
d ; returned result for testing

• Vietnamese example calculating the Fibonacci number:

hàm fiboViệt(trỏ) {
    nếu trỏ == 0 {
        0
    } hay nếu trỏ = 1 {
        1
    } hay {
        fiboViệt(trỏ-2) + fiboViệt(trỏ-1)
    }
}
; vị trí  0 1 2 3 4 5 6 7
; giá trị 0 1 1 2 3 5 8 13
; 8 + 13
in(fiboEnglish(6) + fiboViệt(7)) ; kết quả là 21

• More examples in sample folder

Syntax

Construct	Syntax
Variable declaration	let a = 10
Conditional statement	if 1 == 1 { print("ok") } else { print("what?") }
Looping statement	while 1 == 1 { print("forever") }
Function declaration	fn add(arg1,arg2) { arg1 + arg2}
Printing	print("ok")
Reading user input	let a = input()
Return statement	fn inc(a) { while a<100 {if a == 50 {a return}} } last value before 'return' is always returned
Break statement	while 1 == 1 { if a=3 {break} } last value before 'break' is returned
Array declaration	let arr = [1,2,3]
Array usage	arr[2] = 3, arr = arr + [4]
Array element count	count(arr)
Comment	from ';' to end of line e.g ; this is a comment
Object	let body = { head: { eyes: 2, nose: 1}, torso: 1}

Important note is that all construct returns the last statement's value so these syntax are allowed

let value1 = if 1+1 == 2 {
    1
} else {
    2
}
; value1 is now 1

let start = 0
let sum = while start < 3 {
    start = start + 1
}
; result will be sum = start = 3

let multiply2 = fn (a) {
    a*2
}   
; no need explicit return statement in function

Run

• Requirements: Go >= 1.18
• Checkout this repository then run:

go build
blulang ./sample/hello.blu