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LibJS: Add symbol objects

This commit adds the following classes: SymbolObject, SymbolConstructor,
SymbolPrototype, and Symbol. This commit does not introduce any
new functionality to the Object class, so they cannot be used as
property keys in objects.
This commit is contained in:
mattco98 2020-04-29 23:25:21 -07:00 committed by Andreas Kling
parent b5b08fba92
commit 4ced126704
21 changed files with 819 additions and 3 deletions

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load("test-common.js")
try {
const localSym = Symbol("foo");
const globalSym = Symbol.for("foo");
assert(localSym !== globalSym);
assert(localSym !== Symbol("foo"));
assert(globalSym !== Symbol("foo"));
assert(globalSym === Symbol.for("foo"));
assert(localSym.toString() === "Symbol(foo)");
assert(globalSym.toString() === "Symbol(foo)");
assert(Symbol.for(1).description === "1");
assert(Symbol.for(true).description === "true");
assert(Symbol.for({}).description === "[object Object]");
assert(Symbol.for().description === "undefined");
assert(Symbol.for(null).description === "null");
assertThrowsError(() => {
Symbol.for(Symbol());
}, {
error: TypeError,
message: "Can't convert symbol to string",
});
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

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load("test-common.js")
try {
const s1 = Symbol("foo");
const s2 = Symbol("foo");
assert(s1 !== s2);
assert(s1.description === "foo");
assert(s2.description === "foo");
s1.description = "bar";
assert(s1.description === "foo");
assert(typeof s1 === "symbol");
assertThrowsError(() => {
Symbol(Symbol('foo'));
}, {
error: TypeError,
message: "Can't convert symbol to string"
})
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

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load("test-common.js")
try {
const localSym = Symbol("foo");
const globalSym = Symbol.for("foo");
assert(Symbol.keyFor(localSym) === undefined);
assert(Symbol.keyFor(globalSym) === "foo");
const testThrows = (value, str) => {
assertThrowsError(() => {
Symbol.keyFor(value);
}, {
error: TypeError,
message: str + " is not a symbol",
});
};
testThrows(1, "1");
testThrows(null, "null");
testThrows(undefined, "undefined");
testThrows([], "[object Array]");
testThrows({}, "[object Object]");
testThrows(true, "true");
testThrows("foobar", "foobar");
testThrows(function(){}, "[object ScriptFunction]"); // FIXME: Better function stringification
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

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load("test-common.js")
try {
const s1 = Symbol("foo");
const s2 = Symbol.for("bar");
assert(s1.toString() === "Symbol(foo)");
assert(s2.toString() === "Symbol(bar)");
assertThrowsError(() => {
s1 + "";
}, {
error: TypeError,
message: "Can't convert symbol to string",
});
// FIXME: Uncomment when this doesn't assert
// assertThrowsError(() => {
// s1 + 1;
// }, {
// error: TypeError,
// message: "Can't convert symbol to number",
// });
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

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load("test-common.js");
try {
let local = Symbol('foo');
let global = Symbol.for('foo');
assert(local.valueOf() === local);
assert(global.valueOf() === global);
assert(Symbol.prototype.valueOf.call(local) === local);
assert(Symbol.prototype.valueOf.call(global) === global);
assertThrowsError(() => {
Symbol.prototype.valueOf.call("foo");
}, {
error: TypeError,
message: "object must be of type Symbol"
});
console.log("PASS");
} catch (err) {
console.log("FAIL: " + err);
}