eoc 0.0.3

EO-to-binaries experimental compiler
Documentation 
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// Copyright (c) 2022 Yegor Bugayenko
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

use crate::basket::Bk;
use crate::data::Data;
use crate::emu::Emu;
use crate::loc::Loc;

pub type Atom = fn(&mut Emu, Bk) -> Option<Data>;

pub fn noop(_emu: &mut Emu, _bk: Bk) -> Option<Data> {
    Some(0)
}

pub fn int_add(emu: &mut Emu, bk: Bk) -> Option<Data> {
    Some(emu.read(bk, Loc::Rho)? + emu.read(bk, Loc::Attr(0))?)
}

pub fn int_sub(emu: &mut Emu, bk: Bk) -> Option<Data> {
    Some(emu.read(bk, Loc::Rho)? - emu.read(bk, Loc::Attr(0))?)
}

pub fn int_less(emu: &mut Emu, bk: Bk) -> Option<Data> {
    Some((emu.read(bk, Loc::Rho)? < emu.read(bk, Loc::Attr(0))?) as Data)
}

pub fn bool_if(emu: &mut Emu, bk: Bk) -> Option<Data> {
    let term = emu.read(bk, Loc::Rho)?;
    emu.read(bk, Loc::Attr(if term == 1 { 0 } else { 1 }))
}

#[cfg(test)]
use crate::assert_emu;

#[test]
pub fn bool_if_works() {
    assert_emu!(
        42,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x0001 ⟧
        ν2 ↦ ⟦ λ ↦ bool-if, ρ ↦ ν1, 𝛼0 ↦ ν3, 𝛼1 ↦ ν4 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x002A ⟧
        ν4 ↦ ⟦ Δ ↦ 0x0000 ⟧
    "
    );
    assert_emu!(
        42,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x0000 ⟧
        ν2 ↦ ⟦ λ ↦ bool-if, ρ ↦ ν1, 𝛼0 ↦ ν3, 𝛼1 ↦ ν4 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x0000 ⟧
        ν4 ↦ ⟦ Δ ↦ 0x002A ⟧
    "
    );
}

#[test]
pub fn int_add_works() {
    assert_emu!(
        49,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x0007 ⟧
        ν2 ↦ ⟦ λ ↦ int-add, ρ ↦ ν1, 𝛼0 ↦ ν3 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x002A ⟧
    "
    );
}

#[test]
pub fn int_sub_works() {
    assert_emu!(
        40,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x002A ⟧
        ν2 ↦ ⟦ λ ↦ int-sub, ρ ↦ ν1, 𝛼0 ↦ ν3 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x0002 ⟧
    "
    );
}

#[test]
pub fn int_less_works() {
    assert_emu!(
        0,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x002A ⟧
        ν2 ↦ ⟦ λ ↦ int-less, ρ ↦ ν1, 𝛼0 ↦ ν3 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x0002 ⟧
    "
    );
    assert_emu!(
        0,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x002A ⟧
        ν2 ↦ ⟦ λ ↦ int-less, ρ ↦ ν1, 𝛼0 ↦ ν3 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x002A ⟧
    "
    );
    assert_emu!(
        1,
        "
        ν0 ↦ ⟦ φ ↦ ν2 ⟧
        ν1 ↦ ⟦ Δ ↦ 0x002A ⟧
        ν2 ↦ ⟦ λ ↦ int-less, ρ ↦ ν1, 𝛼0 ↦ ν3 ⟧
        ν3 ↦ ⟦ Δ ↦ 0x002B ⟧
    "
    );
}