srctree

Robin Linden parent ac8a94a8 d9eb03b1
js: Make it possible to convert Values into booleans

js/ast.h added: 38, removed: 2, total 36

@@ -56,6 +56,16 @@ public:

std::shared_ptr<Function const> as_function() const { return std::get<std::shared_ptr<Function>>(value_); }

std::vector<Value> const &as_vector() const { return std::get<std::vector<Value>>(value_); }

bool as_bool() const {

// TODO(robinlinden): false, 0n, null, NaN, objects with an [[IsHTMLDDA]] internal slot.

// https://developer.mozilla.org/en-US/docs/Glossary/Falsy

if (*this == Value{0} || *this == Value{-0} || *this == Value{""} || *this == Value{}) {

return false;

}

return true;

}

[[nodiscard]] bool operator==(Value const &) const = default;

private:

filename was Deleted added: 38, removed: 2, total 36

@@ -0,0 +1,26 @@

// SPDX-FileCopyrightText: 2022 Robin Lindén <dev@robinlinden.eu>

// SPDX-License-Identifier: BSD-2-Clause

#include "js/ast.h"

#include "etest/etest.h"

using namespace js::ast;

using etest::expect_eq;

int main() {

etest::test("Value: as_bool", [] {

expect_eq(Value{""}.as_bool(), false);

expect_eq(Value{0}.as_bool(), false);

expect_eq(Value{-0}.as_bool(), false);

expect_eq(Value{}.as_bool(), false);

expect_eq(Value{" "}.as_bool(), true);

expect_eq(Value{1}.as_bool(), true);

expect_eq(Value{-0.001}.as_bool(), true);

expect_eq(Value{std::vector<Value>{}}.as_bool(), true);

});

return etest::run_all_tests();

}