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add function safeBigInt to wrap BigInt values and provide useful errors

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This commit is contained in:
atsiv sivat 2026-03-08 00:57:03 +00:00
parent 8a75be1b20
commit e95782eba7
1 changed files with 12 additions and 4 deletions
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16
src/core/lib/IEEEBinary.mjs
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@ -28,6 +28,14 @@ function normaliseInput(input) {
return String(input).trim(); return String(input).trim();
} }
function safeBigInt(str, context="number") {
try {
return BigInt(str);
} catch {
throw new Error(`Invalid ${context}`);
}
}
/** /**
* Compute 10^exp as BigInt without using ** on BigInt, to avoid * Compute 10^exp as BigInt without using ** on BigInt, to avoid
@ -216,19 +224,19 @@ export function ToIEEE754Float64(input) {
const sciMatch = input.match(/^(.*)e([+-]?\d+)$/i); const sciMatch = input.match(/^(.*)e([+-]?\d+)$/i);
if (sciMatch) { if (sciMatch) {
input = sciMatch[1]; input = sciMatch[1];
sci = BigInt(sciMatch[2]); sci = safeBigInt(sciMatch[2], "exponent");
} }
let [intStr, fracStr] = input.split("."); let [intStr, fracStr] = input.split(".");
intStr = (intStr || "0").replace(/_/g, ""); intStr = (intStr || "0").replace(/_/g, "");
fracStr = (fracStr || "").replace(/_/g, ""); fracStr = (fracStr || "").replace(/_/g, "");
let N = BigInt(intStr); let N = safeBigInt(intStr, "integer part");
let D = 1n; let D = 1n;
if (fracStr.length > 0) { if (fracStr.length > 0) {
const pow10 = pow10BigInt(BigInt(fracStr.length)); const pow10 = pow10BigInt(BigInt(fracStr.length));
N = N * pow10 + BigInt(fracStr); N = N * pow10 + safeBigInt(fracStr, "fractional part");
D = pow10; D = pow10;
} }