mirror of https://github.com/nodejs/node.git
84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
'use strict';
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const {
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Error,
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ErrorCaptureStackTrace,
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StringPrototypeCharCodeAt,
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StringPrototypeReplace,
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} = primordials;
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const {
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isErrorStackTraceLimitWritable,
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} = require('internal/errors');
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const AssertionError = require('internal/assert/assertion_error');
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const { isError } = require('internal/util');
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const {
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getErrorSourceExpression,
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} = require('internal/errors/error_source');
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// Escape control characters but not \n and \t to keep the line breaks and
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// indentation intact.
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// eslint-disable-next-line no-control-regex
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const escapeSequencesRegExp = /[\x00-\x08\x0b\x0c\x0e-\x1f]/g;
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const meta = [
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'\\u0000', '\\u0001', '\\u0002', '\\u0003', '\\u0004',
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'\\u0005', '\\u0006', '\\u0007', '\\b', '',
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'', '\\u000b', '\\f', '', '\\u000e',
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'\\u000f', '\\u0010', '\\u0011', '\\u0012', '\\u0013',
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'\\u0014', '\\u0015', '\\u0016', '\\u0017', '\\u0018',
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'\\u0019', '\\u001a', '\\u001b', '\\u001c', '\\u001d',
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'\\u001e', '\\u001f',
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];
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const escapeFn = (str) => meta[StringPrototypeCharCodeAt(str, 0)];
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function getErrMessage(fn) {
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const tmpLimit = Error.stackTraceLimit;
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const errorStackTraceLimitIsWritable = isErrorStackTraceLimitWritable();
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// Make sure the limit is set to 1. Otherwise it could fail (<= 0) or it
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// does to much work.
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if (errorStackTraceLimitIsWritable) Error.stackTraceLimit = 1;
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// We only need the stack trace. To minimize the overhead use an object
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// instead of an error.
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const err = {};
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ErrorCaptureStackTrace(err, fn);
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if (errorStackTraceLimitIsWritable) Error.stackTraceLimit = tmpLimit;
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let source = getErrorSourceExpression(err);
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if (source) {
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source = StringPrototypeReplace(source, escapeSequencesRegExp, escapeFn);
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return `The expression evaluated to a falsy value:\n\n ${source}\n`;
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}
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}
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function innerOk(fn, argLen, value, message) {
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if (!value) {
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let generatedMessage = false;
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if (argLen === 0) {
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generatedMessage = true;
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message = 'No value argument passed to `assert.ok()`';
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} else if (message == null) {
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generatedMessage = true;
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message = getErrMessage(fn);
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} else if (isError(message)) {
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throw message;
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}
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const err = new AssertionError({
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actual: value,
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expected: true,
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message,
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operator: '==',
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stackStartFn: fn,
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});
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err.generatedMessage = generatedMessage;
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throw err;
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}
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}
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module.exports = {
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innerOk,
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};
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