compiler-course/src/compiler/parser/tests.rs

use super::*;
use crate::compiler::tokenizer::tokenize;

macro_rules! int_ast {
    ($x:expr) => {
        Box::new(IntLiteral($x))
    };
}

macro_rules! id_ast {
    ($x:expr) => {
        Box::new(Identifier($x))
    };
}

macro_rules! bin_ast {
    ($x:expr, $y:expr, $z:expr) => {
        Box::new(BinaryOp($x, $y, $z))
    };
}

macro_rules! bool_ast {
    ($x:expr) => {
        Box::new(BoolLiteral($x))
    };
}

#[test]
#[should_panic]
fn test_empty() {
    parse(&vec![]);
}

#[test]
#[should_panic]
fn test_invalid_start() {
    parse(&tokenize("1 2 + 3"));
}

#[test]
#[should_panic]
fn test_invalid_middle() {
    parse(&tokenize("1 + 2 2 + 3"));
}

#[test]
#[should_panic]
fn test_invalid_end() {
    parse(&tokenize("1 + 2 3"));
}

#[test]
fn test_binary_op_basic() {
    let result = parse(&tokenize("1 + 23"));
    assert_eq!(result, BinaryOp(int_ast!(1), "+", int_ast!(23)));

    let result = parse(&tokenize("4 - 56"));
    assert_eq!(result, BinaryOp(int_ast!(4), "-", int_ast!(56)));

    let result = parse(&tokenize("1 * 2"));
    assert_eq!(result, BinaryOp(int_ast!(1), "*", int_ast!(2)));

    let result = parse(&tokenize("1 / 2"));
    assert_eq!(result, BinaryOp(int_ast!(1), "/", int_ast!(2)));
}

#[test]
fn test_binary_op_identifier() {
    let result = parse(&tokenize("a + 1"));
    assert_eq!(result, BinaryOp(id_ast!("a"), "+", int_ast!(1)));

    let result = parse(&tokenize("1 - a"));
    assert_eq!(result, BinaryOp(int_ast!(1), "-", id_ast!("a")));
}

#[test]
fn test_binary_op_multiple() {
    let result = parse(&tokenize("1 + 2 - 3"));
    assert_eq!(
        result,
        BinaryOp(bin_ast!(int_ast!(1), "+", int_ast!(2)), "-", int_ast!(3))
    );
}

#[test]
fn test_binary_op_precedence() {
    let result = parse(&tokenize("1 + 2 * 3"));
    assert_eq!(
        result,
        BinaryOp(int_ast!(1), "+", bin_ast!(int_ast!(2), "*", int_ast!(3)),)
    );

    let result = parse(&tokenize("1 - 2 / 3"));
    assert_eq!(
        result,
        BinaryOp(int_ast!(1), "-", bin_ast!(int_ast!(2), "/", int_ast!(3)),)
    );
}

#[test]
fn test_parenthesized() {
    let result = parse(&tokenize("(1+2)*3"));
    assert_eq!(
        result,
        BinaryOp(bin_ast!(int_ast!(1), "+", int_ast!(2)), "*", int_ast!(3),)
    );
}

#[test]
fn test_parenthesized_nested() {
    let result = parse(&tokenize("((1 - 2))/3"));
    assert_eq!(
        result,
        BinaryOp(bin_ast!(int_ast!(1), "-", int_ast!(2)), "/", int_ast!(3),)
    );

    let result = parse(&tokenize("((1 + 2)*3) / 4"));
    assert_eq!(
        result,
        BinaryOp(
            bin_ast!(bin_ast!(int_ast!(1), "+", int_ast!(2)), "*", int_ast!(3)),
            "/",
            int_ast!(4)
        )
    );
}

#[test]
#[should_panic]
fn test_parenthesized_mismatched() {
    parse(&tokenize("(1+2*3"));
}

#[test]
fn test_if_then() {
    let result = parse(&tokenize("if 1 + 2 then 3"));
    assert_eq!(
        result,
        Conditional(bin_ast!(int_ast!(1), "+", int_ast!(2)), int_ast!(3), None,)
    );
}

#[test]
fn test_if_then_else() {
    let result = parse(&tokenize("if a then b + c else 1 * 2"));
    assert_eq!(
        result,
        Conditional(
            id_ast!("a"),
            bin_ast!(id_ast!("b"), "+", id_ast!("c")),
            Some(bin_ast!(int_ast!(1), "*", int_ast!(2)))
        )
    );
}

#[test]
fn test_if_then_else_embedded() {
    let result = parse(&tokenize("1 + if true then 2 else 3"));
    assert_eq!(
        result,
        BinaryOp(
            int_ast!(1),
            "+",
            Box::new(Conditional(bool_ast!(true), int_ast!(2), Some(int_ast!(3))))
        )
    );
}

#[test]
fn test_if_then_else_nested() {
    let result = parse(&tokenize("if true then if false then 1 else 2 else 3"));
    assert_eq!(
        result,
        Conditional(
            bool_ast!(true),
            Box::new(Conditional(
                bool_ast!(false),
                int_ast!(1),
                Some(int_ast!(2))
            )),
            Some(int_ast!(3))
        )
    );
}

#[test]
#[should_panic]
fn test_if_no_then() {
    parse(&tokenize("if true"));
}

#[test]
fn test_func_basic() {
    let result = parse(&tokenize("f(a, b)"));
    assert_eq!(
        result,
        FunCall("f", vec![Identifier("a"), Identifier("b"),])
    );

    let result = parse(&tokenize("f(a, 1 + 2)"));
    assert_eq!(
        result,
        FunCall(
            "f",
            vec![Identifier("a"), BinaryOp(int_ast!(1), "+", int_ast!(2),),]
        )
    );

    let result = parse(&tokenize("f()"));
    assert_eq!(result, FunCall("f", vec![]));
}

#[test]
fn test_func_embedded() {
    let result = parse(&tokenize("1 + f(a)"));
    assert_eq!(
        result,
        BinaryOp(
            int_ast!(1),
            "+",
            Box::new(FunCall("f", vec![Identifier("a")]))
        )
    );
}

#[test]
fn test_func_nested() {
    let result = parse(&tokenize("f(a, g(b))"));
    assert_eq!(
        result,
        FunCall(
            "f",
            vec![Identifier("a"), FunCall("g", vec![Identifier("b")]),]
        )
    );
}

#[test]
#[should_panic]
fn test_func_missing_comma() {
    parse(&tokenize("f(a b)"));
}

#[test]
#[should_panic]
fn test_func_missing_close() {
    parse(&tokenize("f(a"));
}