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- "use strict";
-
- var conversions = {};
- module.exports = conversions;
-
- function sign(x) {
- return x < 0 ? -1 : 1;
- }
-
- function evenRound(x) {
- // Round x to the nearest integer, choosing the even integer if it lies halfway between two.
- if ((x % 1) === 0.5 && (x & 1) === 0) { // [even number].5; round down (i.e. floor)
- return Math.floor(x);
- } else {
- return Math.round(x);
- }
- }
-
- function createNumberConversion(bitLength, typeOpts) {
- if (!typeOpts.unsigned) {
- --bitLength;
- }
- const lowerBound = typeOpts.unsigned ? 0 : -Math.pow(2, bitLength);
- const upperBound = Math.pow(2, bitLength) - 1;
-
- const moduloVal = typeOpts.moduloBitLength ? Math.pow(2, typeOpts.moduloBitLength) : Math.pow(2, bitLength);
- const moduloBound = typeOpts.moduloBitLength ? Math.pow(2, typeOpts.moduloBitLength - 1) : Math.pow(2, bitLength - 1);
-
- return function(V, opts) {
- if (!opts) opts = {};
-
- let x = +V;
-
- if (opts.enforceRange) {
- if (!Number.isFinite(x)) {
- throw new TypeError("Argument is not a finite number");
- }
-
- x = sign(x) * Math.floor(Math.abs(x));
- if (x < lowerBound || x > upperBound) {
- throw new TypeError("Argument is not in byte range");
- }
-
- return x;
- }
-
- if (!isNaN(x) && opts.clamp) {
- x = evenRound(x);
-
- if (x < lowerBound) x = lowerBound;
- if (x > upperBound) x = upperBound;
- return x;
- }
-
- if (!Number.isFinite(x) || x === 0) {
- return 0;
- }
-
- x = sign(x) * Math.floor(Math.abs(x));
- x = x % moduloVal;
-
- if (!typeOpts.unsigned && x >= moduloBound) {
- return x - moduloVal;
- } else if (typeOpts.unsigned) {
- if (x < 0) {
- x += moduloVal;
- } else if (x === -0) { // don't return negative zero
- return 0;
- }
- }
-
- return x;
- }
- }
-
- conversions["void"] = function () {
- return undefined;
- };
-
- conversions["boolean"] = function (val) {
- return !!val;
- };
-
- conversions["byte"] = createNumberConversion(8, { unsigned: false });
- conversions["octet"] = createNumberConversion(8, { unsigned: true });
-
- conversions["short"] = createNumberConversion(16, { unsigned: false });
- conversions["unsigned short"] = createNumberConversion(16, { unsigned: true });
-
- conversions["long"] = createNumberConversion(32, { unsigned: false });
- conversions["unsigned long"] = createNumberConversion(32, { unsigned: true });
-
- conversions["long long"] = createNumberConversion(32, { unsigned: false, moduloBitLength: 64 });
- conversions["unsigned long long"] = createNumberConversion(32, { unsigned: true, moduloBitLength: 64 });
-
- conversions["double"] = function (V) {
- const x = +V;
-
- if (!Number.isFinite(x)) {
- throw new TypeError("Argument is not a finite floating-point value");
- }
-
- return x;
- };
-
- conversions["unrestricted double"] = function (V) {
- const x = +V;
-
- if (isNaN(x)) {
- throw new TypeError("Argument is NaN");
- }
-
- return x;
- };
-
- // not quite valid, but good enough for JS
- conversions["float"] = conversions["double"];
- conversions["unrestricted float"] = conversions["unrestricted double"];
-
- conversions["DOMString"] = function (V, opts) {
- if (!opts) opts = {};
-
- if (opts.treatNullAsEmptyString && V === null) {
- return "";
- }
-
- return String(V);
- };
-
- conversions["ByteString"] = function (V, opts) {
- const x = String(V);
- let c = undefined;
- for (let i = 0; (c = x.codePointAt(i)) !== undefined; ++i) {
- if (c > 255) {
- throw new TypeError("Argument is not a valid bytestring");
- }
- }
-
- return x;
- };
-
- conversions["USVString"] = function (V) {
- const S = String(V);
- const n = S.length;
- const U = [];
- for (let i = 0; i < n; ++i) {
- const c = S.charCodeAt(i);
- if (c < 0xD800 || c > 0xDFFF) {
- U.push(String.fromCodePoint(c));
- } else if (0xDC00 <= c && c <= 0xDFFF) {
- U.push(String.fromCodePoint(0xFFFD));
- } else {
- if (i === n - 1) {
- U.push(String.fromCodePoint(0xFFFD));
- } else {
- const d = S.charCodeAt(i + 1);
- if (0xDC00 <= d && d <= 0xDFFF) {
- const a = c & 0x3FF;
- const b = d & 0x3FF;
- U.push(String.fromCodePoint((2 << 15) + (2 << 9) * a + b));
- ++i;
- } else {
- U.push(String.fromCodePoint(0xFFFD));
- }
- }
- }
- }
-
- return U.join('');
- };
-
- conversions["Date"] = function (V, opts) {
- if (!(V instanceof Date)) {
- throw new TypeError("Argument is not a Date object");
- }
- if (isNaN(V)) {
- return undefined;
- }
-
- return V;
- };
-
- conversions["RegExp"] = function (V, opts) {
- if (!(V instanceof RegExp)) {
- V = new RegExp(V);
- }
-
- return V;
- };
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