Prima language Compiler

v. 0.6

Features

• kotlin-like syntax (but, e.g., with semicolons)
• primitive int,bool and str types
• arrays
• primitive operators:
  • +, -, *, /, % - (int, int) -> int
  • ==, != - ((T, T) -> bool)
  • <, <=, >, >= - ((int, int) -> bool)
  • &&, || - ((bool, bool) -> bool)
  • + - (str, str) -> str)
• if, if-else, while and for control-flow statements
• readInt, readBool, readStr, write and writeln pre-built functions
• nop
• user-defined functions (without overloading)
• JVM as target platform (JAVA class is generated)
• constant folding and constant propagation optimizations
• dead code elimination optimization

Build

The project can be built with gradle

Some details about the specification

Source file name should be in form [name].prima.

Output class file will be named [name].class with class [name] inside. Use java [name] to run it

Primitive type variable's declaration syntax (all variables are mutable): var N:T = EXPR. All variables must be initialized in the declaration.

Array variable's declaration syntax: var N:T[] = T[size], where T: Primitive | T[]. Default value for an array of int is 0, for array of bool is false. For an array of str default value is not set: if you try to get uninitialized value of such array it is undefined behavior (NPE from JVM actually :) ).

Function's declaration syntax: fun [main]([N1]:[T1], ... ,[Nn]:[Tn]): type {}.

for structure: for( (VAR_DECLARATION|VAR_ASSIGNMENT)?; expr; VAR_ASSIGNMENT?)

Entry point should be fun main(): void.

Examples

Fast power computation:

fun main(): void {
    writeln(binpow(readInt(), readInt()));
}

fun binpow(a: int, n: int): int {
    var res: int = 1;
    while (n > 0) {
        if (n % 2 == 1) {
            res = res * a;
        }
        a = a * a;
        n= n / 2;
    }
    return res;
}

Some string stuff:

fun main(): void {
    greetings();
    var name: str = getName();
    if (name == "Ilya") {
        writeln("Hello, master!");
    } else {
        writeln("Hello, " + name + "!");
    }
}

fun greetings(): void {
    writeln("What is your name?");
}

fun getName(): str {
    return readStr();
}

Some arrays stuff:

fun main(): void {
	var tenOfTenOfTen: int[][] = int[ten()][10];
	for (var i: int = 0; i < 10; i = i + 1) {
        tenOfTenOfTen[i] = tenOfTen();
    }
    tenOfTenOfTen[1][2] = 5;
    writeln(tenOfTenOfTen[1][2]);
}

fun ten(): int {
	return 10;
}

fun tenOfTen(): int[] {
	var tenOfTen: int[] = int[ten()];
    for (var i: int = 0; i < 10; i = i + 1) {
        tenOfTen[i] = 10;
    }
	return tenOfTen;
}

More examples are in examples folder.