tests.rs - mozsearch

use crate::{

    Literal, ParseError,

    test_util::{assert_parse_ok_eq, assert_roundtrip},

};

use super::{FloatLit, FloatType};

// ===== Utility functions =======================================================================

/// Helper macro to check parsing a float.

///

/// This macro contains quite a bit of logic itself (which can be buggy of

/// course), so we have a few test functions below to test a bunch of cases

/// manually.

macro_rules! check {

    ($intpart:literal $fracpart:literal $exppart:literal $suffix:tt) => {

        let input = concat!($intpart, $fracpart, $exppart, check!(@stringify_suffix $suffix));

        let expected_float = FloatLit {

            raw: input,

            end_integer_part: $intpart.len(),

            end_fractional_part: $intpart.len() + $fracpart.len(),

            end_number_part: $intpart.len() + $fracpart.len() + $exppart.len(),

};

        assert_parse_ok_eq(

            input, FloatLit::parse(input), expected_float.clone(), "FloatLit::parse");

        assert_parse_ok_eq(

            input, Literal::parse(input), Literal::Float(expected_float), "Literal::parse");

        assert_eq!(FloatLit::parse(input).unwrap().suffix(), check!(@ty $suffix));

        assert_roundtrip(expected_float.to_owned(), input);

};

    (@ty f32) => { "f32" };

    (@ty f64) => { "f64" };

    (@ty -) => { "" };

    (@stringify_suffix -) => { "" };

    (@stringify_suffix $suffix:ident) => { stringify!($suffix) };

// ===== Actual tests ===========================================================================

#[test]

fn manual_without_suffix() -> Result<(), ParseError> {

    let f = FloatLit::parse("3.14")?;

    assert_eq!(f.number_part(), "3.14");

    assert_eq!(f.integer_part(), "3");

    assert_eq!(f.fractional_part(), Some("14"));

    assert_eq!(f.exponent_part(), "");

    assert_eq!(f.suffix(), "");

    let f = FloatLit::parse("9.")?;

    assert_eq!(f.number_part(), "9.");

    assert_eq!(f.integer_part(), "9");

    assert_eq!(f.fractional_part(), Some(""));

    assert_eq!(f.exponent_part(), "");

    assert_eq!(f.suffix(), "");

    let f = FloatLit::parse("8e1")?;

    assert_eq!(f.number_part(), "8e1");

    assert_eq!(f.integer_part(), "8");

    assert_eq!(f.fractional_part(), None);

    assert_eq!(f.exponent_part(), "e1");

    assert_eq!(f.suffix(), "");

    let f = FloatLit::parse("8E3")?;

    assert_eq!(f.number_part(), "8E3");

    assert_eq!(f.integer_part(), "8");

    assert_eq!(f.fractional_part(), None);

    assert_eq!(f.exponent_part(), "E3");

    assert_eq!(f.suffix(), "");

    let f = FloatLit::parse("8_7_6.1_23e15")?;

    assert_eq!(f.number_part(), "8_7_6.1_23e15");

    assert_eq!(f.integer_part(), "8_7_6");

    assert_eq!(f.fractional_part(), Some("1_23"));

    assert_eq!(f.exponent_part(), "e15");

    assert_eq!(f.suffix(), "");

    let f = FloatLit::parse("8.2e-_04_9")?;

    assert_eq!(f.number_part(), "8.2e-_04_9");

    assert_eq!(f.integer_part(), "8");

    assert_eq!(f.fractional_part(), Some("2"));

    assert_eq!(f.exponent_part(), "e-_04_9");

    assert_eq!(f.suffix(), "");

    Ok(())

#[test]

fn manual_with_suffix() -> Result<(), ParseError> {

    let f = FloatLit::parse("3.14f32")?;

    assert_eq!(f.number_part(), "3.14");

    assert_eq!(f.integer_part(), "3");

    assert_eq!(f.fractional_part(), Some("14"));

    assert_eq!(f.exponent_part(), "");

    assert_eq!(FloatType::from_suffix(f.suffix()), Some(FloatType::F32));

    let f = FloatLit::parse("8e1f64")?;

    assert_eq!(f.number_part(), "8e1");

    assert_eq!(f.integer_part(), "8");

    assert_eq!(f.fractional_part(), None);

    assert_eq!(f.exponent_part(), "e1");

    assert_eq!(FloatType::from_suffix(f.suffix()), Some(FloatType::F64));

    let f = FloatLit::parse("8_7_6.1_23e15f32")?;

    assert_eq!(f.number_part(), "8_7_6.1_23e15");

    assert_eq!(f.integer_part(), "8_7_6");

    assert_eq!(f.fractional_part(), Some("1_23"));

    assert_eq!(f.exponent_part(), "e15");

    assert_eq!(FloatType::from_suffix(f.suffix()), Some(FloatType::F32));

    let f = FloatLit::parse("8.2e-_04_9f64")?;

    assert_eq!(f.number_part(), "8.2e-_04_9");

    assert_eq!(f.integer_part(), "8");

    assert_eq!(f.fractional_part(), Some("2"));

    assert_eq!(f.exponent_part(), "e-_04_9");

    assert_eq!(FloatType::from_suffix(f.suffix()), Some(FloatType::F64));

    Ok(())

#[test]

fn simple() {

    check!("3" ".14" "" -);

    check!("3" ".14" "" f32);

    check!("3" ".14" "" f64);

    check!("3" "" "e987654321" -);

    check!("3" "" "e987654321" f64);

    check!("42_888" ".05" "" -);

    check!("42_888" ".05" "E5___" f32);

    check!("123456789" "" "e_1" f64);

    check!("123456789" ".99" "e_1" f64);

    check!("123456789" ".99" "" f64);

    check!("123456789" ".99" "" -);

    check!("147" ".3_33" "" -);

    check!("147" ".3_33__" "E3" f64);

    check!("147" ".3_33__" "" f32);

    check!("147" ".333" "e-10" -);

    check!("147" ".333" "e-_7" f32);

    check!("147" ".333" "e+10" -);

    check!("147" ".333" "e+_7" f32);

    check!("86" "." "" -);

    check!("0" "." "" -);

    check!("0_" "." "" -);

    check!("0" ".0000001" "" -);

    check!("0" ".000_0001" "" -);

    check!("0" ".0" "e+0" -);

    check!("0" "" "E+0" -);

    check!("34" "" "e+0" -);

    check!("0" ".9182" "E+0" f32);

#[test]

fn non_standard_suffixes() {

    #[track_caller]

    fn check_suffix(

        input: &str,

        integer_part: &str,

        fractional_part: Option<&str>,

        exponent_part: &str,

        suffix: &str,

) {

        let lit = FloatLit::parse(input)

            .unwrap_or_else(|e| panic!("expected to parse '{}' but got {}", input, e));

        assert_eq!(lit.integer_part(), integer_part);

        assert_eq!(lit.fractional_part(), fractional_part);

        assert_eq!(lit.exponent_part(), exponent_part);

        assert_eq!(lit.suffix(), suffix);

        let lit = match Literal::parse(input) {

            Ok(Literal::Float(f)) => f,

            other => panic!("Expected float literal, but got {:?} for '{}'", other, input),

};

        assert_eq!(lit.integer_part(), integer_part);

        assert_eq!(lit.fractional_part(), fractional_part);

        assert_eq!(lit.exponent_part(), exponent_part);

        assert_eq!(lit.suffix(), suffix);

    check_suffix("7.1f23", "7", Some("1"), "", "f23");

    check_suffix("7.1f320", "7", Some("1"), "", "f320");

    check_suffix("7.1f64_", "7", Some("1"), "", "f64_");

    check_suffix("8.1f649", "8", Some("1"), "", "f649");

    check_suffix("8.1f64f32", "8", Some("1"), "", "f64f32");

    check_suffix("23e2_banana", "23", None, "e2_", "banana");

    check_suffix("23.2_banana", "23", Some("2_"), "", "banana");

    check_suffix("23e2pe55ter", "23", None, "e2", "pe55ter");

    check_suffix("23e2p_e55ter", "23", None, "e2", "p_e55ter");

    check_suffix("3.15Jürgen", "3", Some("15"), "", "Jürgen");

    check_suffix("3e2e5", "3", None, "e2", "e5");

    check_suffix("3e2e5f", "3", None, "e2", "e5f");

#[test]

fn parse_err() {

    assert_err!(FloatLit, "", Empty, None);

    assert_err_single!(FloatLit::parse("."), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("+"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("-"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("e"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("e8"), DoesNotStartWithDigit, 0);

    assert_err!(FloatLit, "0e", NoExponentDigits, 1..2);

    assert_err_single!(FloatLit::parse("f32"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("foo"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("inf"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("nan"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("NaN"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("NAN"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse("_2.7"), DoesNotStartWithDigit, 0);

    assert_err_single!(FloatLit::parse(".5"), DoesNotStartWithDigit, 0);

    assert_err!(FloatLit, "1e", NoExponentDigits, 1..2);

    assert_err!(FloatLit, "1.e4", UnexpectedChar, 2);

    assert_err!(FloatLit, "3._4", UnexpectedChar, 2);

    assert_err!(FloatLit, "3.f32", UnexpectedChar, 2);

    assert_err!(FloatLit, "3.e5", UnexpectedChar, 2);

    assert_err!(FloatLit, "12345._987", UnexpectedChar, 6);

    assert_err!(FloatLit, "46._", UnexpectedChar, 3);

    assert_err!(FloatLit, "46.f32", UnexpectedChar, 3);

    assert_err!(FloatLit, "46.e3", UnexpectedChar, 3);

    assert_err!(FloatLit, "46._e3", UnexpectedChar, 3);

    assert_err!(FloatLit, "46.e3f64", UnexpectedChar, 3);

    assert_err!(FloatLit, "23.4e_", NoExponentDigits, 4..6);

    assert_err!(FloatLit, "23E___f32", NoExponentDigits, 2..6);

    assert_err!(FloatLit, "55e3.1", UnexpectedChar, 4..6);

    assert_err!(FloatLit, "3.7+", UnexpectedChar, 3..4);

    assert_err!(FloatLit, "3.7+2", UnexpectedChar, 3..5);

    assert_err!(FloatLit, "3.7-", UnexpectedChar, 3..4);

    assert_err!(FloatLit, "3.7-2", UnexpectedChar, 3..5);

    assert_err!(FloatLit, "3.7e+", NoExponentDigits, 3..5);

    assert_err!(FloatLit, "3.7e-", NoExponentDigits, 3..5);

    assert_err!(FloatLit, "3.7e-+3", NoExponentDigits, 3..5);  // suboptimal error

    assert_err!(FloatLit, "3.7e+-3", NoExponentDigits, 3..5);  // suboptimal error

    assert_err_single!(FloatLit::parse("0x44.5"), InvalidSuffix, 1..6);

    assert_err_single!(FloatLit::parse("3"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("35_389"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("9_8_7f32"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("9_8_7banana"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("7f23"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("7f320"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("7f64_"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("8f649"), UnexpectedIntegerLit, None);

    assert_err_single!(FloatLit::parse("8f64f32"), UnexpectedIntegerLit, None);

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