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LibJS: Implement conversion of strings to BigInts according to the spec

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The spec defines a StringToBigInt AO which allows for converting binary,
octal, decimal, and hexadecimal strings to a BigInt. Our conversion was
only allowing for decimal strings.
This commit is contained in:
Timothy Flynn 2022-01-31 10:23:51 -05:00 • committed by Linus Groh
parent 94a346c9b9
commit 281b0411f2
3 changed files with 141 additions and 4 deletions
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60
Userland/Libraries/LibJS/Tests/builtins/BigInt/BigInt.js
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@ -29,6 +29,40 @@ describe("correct behavior", () => {
test("constructor with objects", () => {
expect(BigInt([])).toBe(0n);
});
test("base-2 strings", () => {
expect(BigInt("0b0")).toBe(0n);
expect(BigInt("0B0")).toBe(0n);
expect(BigInt("0b1")).toBe(1n);
expect(BigInt("0B1")).toBe(1n);
expect(BigInt("0b10")).toBe(2n);
expect(BigInt("0B10")).toBe(2n);
expect(BigInt(`0b${"1".repeat(100)}`)).toBe(1267650600228229401496703205375n);
});
test("base-8 strings", () => {
expect(BigInt("0o0")).toBe(0n);
expect(BigInt("0O0")).toBe(0n);
expect(BigInt("0o1")).toBe(1n);
expect(BigInt("0O1")).toBe(1n);
expect(BigInt("0o7")).toBe(7n);
expect(BigInt("0O7")).toBe(7n);
expect(BigInt("0o10")).toBe(8n);
expect(BigInt("0O10")).toBe(8n);
expect(BigInt(`0o1${"7".repeat(33)}`)).toBe(1267650600228229401496703205375n);
});
test("base-16 strings", () => {
expect(BigInt("0x0")).toBe(0n);
expect(BigInt("0X0")).toBe(0n);
expect(BigInt("0x1")).toBe(1n);
expect(BigInt("0X1")).toBe(1n);
expect(BigInt("0xf")).toBe(15n);
expect(BigInt("0Xf")).toBe(15n);
expect(BigInt("0x10")).toBe(16n);
expect(BigInt("0X10")).toBe(16n);
expect(BigInt(`0x${"f".repeat(25)}`)).toBe(1267650600228229401496703205375n);
});
});
describe("errors", () => {
@ -65,4 +99,30 @@ describe("errors", () => {
}).toThrowWithMessage(RangeError, "Cannot convert non-integral number to BigInt");
});
});
test("invalid string for base", () => {
["0b", "0b2", "0B02", "-0b1", "-0B1"].forEach(value => {
expect(() => {
BigInt(value);
}).toThrowWithMessage(SyntaxError, `Invalid value for BigInt: ${value}`);
});
["0o", "0o8", "0O08", "-0o1", "-0O1"].forEach(value => {
expect(() => {
BigInt(value);
}).toThrowWithMessage(SyntaxError, `Invalid value for BigInt: ${value}`);
});
["0x", "0xg", "0X0g", "-0x1", "-0X1"].forEach(value => {
expect(() => {
BigInt(value);
}).toThrowWithMessage(SyntaxError, `Invalid value for BigInt: ${value}`);
});
["a", "-1a"].forEach(value => {
expect(() => {
BigInt(value);
}).toThrowWithMessage(SyntaxError, `Invalid value for BigInt: ${value}`);
});
});
});