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'use strict';
const binding = process.binding('util');
const prefix = `(${process.release.name}:${process.pid}) `;
const kArrowMessagePrivateSymbolIndex = binding['arrow_message_private_symbol'];
const kDecoratedPrivateSymbolIndex = binding['decorated_private_symbol'];
exports.getHiddenValue = binding.getHiddenValue;
exports.setHiddenValue = binding.setHiddenValue;
// The `buffer` module uses this. Defining it here instead of in the public
// `util` module makes it accessible without having to `require('util')` there.
exports.customInspectSymbol = Symbol('util.inspect.custom');
// All the internal deprecations have to use this function only, as this will
// prepend the prefix to the actual message.
exports.deprecate = function(fn, msg, code) {
return exports._deprecate(fn, msg, code);
};
exports.error = function(msg) {
const fmt = `${prefix}${msg}`;
if (arguments.length > 1) {
const args = new Array(arguments.length);
args[0] = fmt;
for (var i = 1; i < arguments.length; ++i)
args[i] = arguments[i];
console.error.apply(console, args);
} else {
console.error(fmt);
}
};
exports.trace = function(msg) {
console.trace(`${prefix}${msg}`);
};
// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports._deprecate = function(fn, msg, code) {
// Allow for deprecating things in the process of starting up.
if (global.process === undefined) {
return function() {
return exports._deprecate(fn, msg).apply(this, arguments);
};
}
if (process.noDeprecation === true) {
return fn;
}
if (code !== undefined && typeof code !== 'string')
throw new TypeError('`code` argument must be a string');
var warned = false;
function deprecated() {
if (!warned) {
warned = true;
if (code !== undefined) {
process.emitWarning(msg, 'DeprecationWarning', code, deprecated);
} else {
process.emitWarning(msg, 'DeprecationWarning', deprecated);
}
}
if (new.target) {
return Reflect.construct(fn, arguments, new.target);
}
return fn.apply(this, arguments);
}
// The wrapper will keep the same prototype as fn to maintain prototype chain
Object.setPrototypeOf(deprecated, fn);
if (fn.prototype) {
// Setting this (rather than using Object.setPrototype, as above) ensures
// that calling the unwrapped constructor gives an instanceof the wrapped
// constructor.
deprecated.prototype = fn.prototype;
}
return deprecated;
};
exports.decorateErrorStack = function decorateErrorStack(err) {
if (!(exports.isError(err) && err.stack) ||
exports.getHiddenValue(err, kDecoratedPrivateSymbolIndex) === true)
return;
const arrow = exports.getHiddenValue(err, kArrowMessagePrivateSymbolIndex);
if (arrow) {
err.stack = arrow + err.stack;
exports.setHiddenValue(err, kDecoratedPrivateSymbolIndex, true);
}
};
exports.isError = function isError(e) {
return exports.objectToString(e) === '[object Error]' || e instanceof Error;
};
exports.objectToString = function objectToString(o) {
return Object.prototype.toString.call(o);
};
const noCrypto = !process.versions.openssl;
exports.assertCrypto = function() {
if (noCrypto)
throw new Error('Node.js is not compiled with openssl crypto support');
};
exports.kIsEncodingSymbol = Symbol('node.isEncoding');
// The loop should only run at most twice, retrying with lowercased enc
// if there is no match in the first pass.
// We use a loop instead of branching to retry with a helper
// function in order to avoid the performance hit.
// Return undefined if there is no match.
exports.normalizeEncoding = function normalizeEncoding(enc) {
if (!enc) return 'utf8';
var retried;
while (true) {
switch (enc) {
case 'utf8':
case 'utf-8':
return 'utf8';
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return 'utf16le';
case 'latin1':
case 'binary':
return 'latin1';
case 'base64':
case 'ascii':
case 'hex':
return enc;
default:
if (retried) return; // undefined
enc = ('' + enc).toLowerCase();
retried = true;
}
}
};
// Filters duplicate strings. Used to support functions in crypto and tls
// modules. Implemented specifically to maintain existing behaviors in each.
exports.filterDuplicateStrings = function filterDuplicateStrings(items, low) {
const map = new Map();
for (var i = 0; i < items.length; i++) {
const item = items[i];
const key = item.toLowerCase();
if (low) {
map.set(key, key);
} else {
map.set(key, item);
}
}
return Array.from(map.values()).sort();
};
exports.cachedResult = function cachedResult(fn) {
var result;
return () => {
if (result === undefined)
result = fn();
return result.slice();
};
};
/*
* Implementation of ToInteger as per ECMAScript Specification
* Refer: http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger
*/
const toInteger = exports.toInteger = function toInteger(argument) {
const number = +argument;
return Number.isNaN(number) ? 0 : Math.trunc(number);
};
/*
* Implementation of ToLength as per ECMAScript Specification
* Refer: http://www.ecma-international.org/ecma-262/6.0/#sec-tolength
*/
exports.toLength = function toLength(argument) {
const len = toInteger(argument);
return len <= 0 ? 0 : Math.min(len, Number.MAX_SAFE_INTEGER);
};
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