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422 lines (369 loc) · 13.9 KB
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'use strict';
const {
ArrayPrototypeJoin,
ArrayPrototypePop,
ArrayPrototypeSlice,
Error,
ErrorCaptureStackTrace,
ObjectAssign,
ObjectDefineProperty,
ObjectGetPrototypeOf,
ObjectPrototypeHasOwnProperty,
SafeSet,
String,
StringPrototypeRepeat,
StringPrototypeSlice,
StringPrototypeSplit,
} = primordials;
const { isError } = require('internal/util');
const { inspect } = require('internal/util/inspect');
const colors = require('internal/util/colors');
const { validateObject } = require('internal/validators');
const { isErrorStackTraceLimitWritable } = require('internal/errors');
const { myersDiff, printMyersDiff, printSimpleMyersDiff } = require('internal/assert/myers_diff');
const kReadableOperator = {
deepStrictEqual: 'Expected values to be strictly deep-equal:',
partialDeepStrictEqual: 'Expected values to be partially and strictly deep-equal:',
strictEqual: 'Expected values to be strictly equal:',
strictEqualObject: 'Expected "actual" to be reference-equal to "expected":',
deepEqual: 'Expected values to be loosely deep-equal:',
notDeepStrictEqual: 'Expected "actual" not to be strictly deep-equal to:',
notStrictEqual: 'Expected "actual" to be strictly unequal to:',
notStrictEqualObject:
'Expected "actual" not to be reference-equal to "expected":',
notDeepEqual: 'Expected "actual" not to be loosely deep-equal to:',
notIdentical: 'Values have same structure but are not reference-equal:',
notDeepEqualUnequal: 'Expected values not to be loosely deep-equal:',
};
const kMaxShortStringLength = 12;
const kMaxLongStringLength = 512;
const kMethodsWithCustomMessageDiff = new SafeSet()
.add('deepStrictEqual')
.add('strictEqual')
.add('partialDeepStrictEqual');
function copyError(source) {
const target = ObjectAssign(
{ __proto__: ObjectGetPrototypeOf(source) },
source,
);
ObjectDefineProperty(target, 'message', {
__proto__: null,
value: source.message,
});
if (ObjectPrototypeHasOwnProperty(source, 'cause')) {
let { cause } = source;
if (isError(cause)) {
cause = copyError(cause);
}
ObjectDefineProperty(target, 'cause', { __proto__: null, value: cause });
}
return target;
}
function inspectValue(val) {
// The util.inspect default values could be changed. This makes sure the
// error messages contain the necessary information nevertheless.
return inspect(val, {
compact: false,
customInspect: false,
depth: 1000,
maxArrayLength: Infinity,
// Assert compares only enumerable properties (with a few exceptions).
showHidden: false,
// Assert does not detect proxies currently.
showProxy: false,
sorted: true,
// Inspect getters as we also check them when comparing entries.
getters: true,
});
}
function getErrorMessage(operator, message) {
return message || kReadableOperator[operator];
}
function checkOperator(actual, expected, operator) {
// In case both values are objects or functions explicitly mark them as not
// reference equal for the `strictEqual` operator.
if (
operator === 'strictEqual' &&
((typeof actual === 'object' &&
actual !== null &&
typeof expected === 'object' &&
expected !== null) ||
(typeof actual === 'function' && typeof expected === 'function'))
) {
operator = 'strictEqualObject';
}
return operator;
}
function getColoredMyersDiff(actual, expected) {
const header = `${colors.green}actual${colors.white} ${colors.red}expected${colors.white}`;
const skipped = false;
const diff = myersDiff(StringPrototypeSplit(actual, ''), StringPrototypeSplit(expected, ''));
let message = printSimpleMyersDiff(diff);
if (skipped) {
message += '...';
}
return { message, header, skipped };
}
function getStackedDiff(actual, expected) {
const isStringComparison = typeof actual === 'string' && typeof expected === 'string';
let message = `\n${colors.green}+${colors.white} ${actual}\n${colors.red}- ${colors.white}${expected}`;
const stringsLen = actual.length + expected.length;
const maxTerminalLength = process.stderr.isTTY ? process.stderr.columns : 80;
const showIndicator = isStringComparison && (stringsLen <= maxTerminalLength);
if (showIndicator) {
let indicatorIdx = -1;
for (let i = 0; i < actual.length; i++) {
if (actual[i] !== expected[i]) {
// Skip the indicator for the first 2 characters because the diff is immediately apparent
// It is 3 instead of 2 to account for the quotes
if (i >= 3) {
indicatorIdx = i;
}
break;
}
}
if (indicatorIdx !== -1) {
message += `\n${StringPrototypeRepeat(' ', indicatorIdx + 2)}^`;
}
}
return { message };
}
function getSimpleDiff(originalActual, actual, originalExpected, expected) {
let stringsLen = actual.length + expected.length;
// Accounting for the quotes wrapping strings
if (typeof originalActual === 'string') {
stringsLen -= 2;
}
if (typeof originalExpected === 'string') {
stringsLen -= 2;
}
if (stringsLen <= kMaxShortStringLength && (originalActual !== 0 || originalExpected !== 0)) {
return { message: `${actual} !== ${expected}`, header: '' };
}
const isStringComparison = typeof originalActual === 'string' && typeof originalExpected === 'string';
// colored myers diff
if (isStringComparison && colors.hasColors) {
return getColoredMyersDiff(actual, expected);
}
return getStackedDiff(actual, expected);
}
function isSimpleDiff(actual, inspectedActual, expected, inspectedExpected) {
if (inspectedActual.length > 1 || inspectedExpected.length > 1) {
return false;
}
return typeof actual !== 'object' || actual === null || typeof expected !== 'object' || expected === null;
}
function createErrDiff(actual, expected, operator, customMessage, diffType = 'simple') {
operator = checkOperator(actual, expected, operator);
let skipped = false;
let message = '';
const inspectedActual = inspectValue(actual);
const inspectedExpected = inspectValue(expected);
const inspectedSplitActual = StringPrototypeSplit(inspectedActual, '\n');
const inspectedSplitExpected = StringPrototypeSplit(inspectedExpected, '\n');
const showSimpleDiff = isSimpleDiff(actual, inspectedSplitActual, expected, inspectedSplitExpected);
let header = `${colors.green}+ actual${colors.white} ${colors.red}- expected${colors.white}`;
if (showSimpleDiff) {
const simpleDiff = getSimpleDiff(actual, inspectedSplitActual[0], expected, inspectedSplitExpected[0]);
message = simpleDiff.message;
if (typeof simpleDiff.header !== 'undefined') {
header = simpleDiff.header;
}
if (simpleDiff.skipped) {
skipped = true;
}
} else if (inspectedActual === inspectedExpected) {
// Handles the case where the objects are structurally the same but different references
operator = 'notIdentical';
if (inspectedSplitActual.length > 50 && diffType !== 'full') {
message = `${ArrayPrototypeJoin(ArrayPrototypeSlice(inspectedSplitActual, 0, 50), '\n')}\n...}`;
skipped = true;
} else {
message = ArrayPrototypeJoin(inspectedSplitActual, '\n');
}
header = '';
} else {
const checkCommaDisparity = actual != null && typeof actual === 'object';
const diff = myersDiff(inspectedSplitActual, inspectedSplitExpected, checkCommaDisparity);
const myersDiffMessage = printMyersDiff(diff, operator);
message = myersDiffMessage.message;
if (operator === 'partialDeepStrictEqual') {
header = `${colors.gray}${colors.hasColors ? '' : '+ '}actual${colors.white} ${colors.red}- expected${colors.white}`;
}
if (myersDiffMessage.skipped) {
skipped = true;
}
}
const headerMessage = `${getErrorMessage(operator, customMessage)}\n${header}`;
const skippedMessage = skipped ? '\n... Skipped lines' : '';
return `${headerMessage}${skippedMessage}\n${message}\n`;
}
function addEllipsis(string) {
const lines = StringPrototypeSplit(string, '\n', 11);
if (lines.length > 10) {
lines.length = 10;
return `${ArrayPrototypeJoin(lines, '\n')}\n...`;
} else if (string.length > kMaxLongStringLength) {
return `${StringPrototypeSlice(string, kMaxLongStringLength)}...`;
}
return string;
}
class AssertionError extends Error {
constructor(options) {
validateObject(options, 'options');
const {
message,
operator,
stackStartFn,
details,
// Compatibility with older versions.
stackStartFunction,
diff = 'simple',
} = options;
let {
actual,
expected,
} = options;
const limit = Error.stackTraceLimit;
if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = 0;
if (message != null) {
if (kMethodsWithCustomMessageDiff.has(operator)) {
super(createErrDiff(actual, expected, operator, message, diff));
} else {
super(String(message));
}
} else {
// Reset colors on each call to make sure we handle dynamically set environment
// variables correct.
colors.refresh();
// Prevent the error stack from being visible by duplicating the error
// in a very close way to the original in case both sides are actually
// instances of Error.
if (typeof actual === 'object' && actual !== null &&
typeof expected === 'object' && expected !== null &&
'stack' in actual && actual instanceof Error &&
'stack' in expected && expected instanceof Error) {
actual = copyError(actual);
expected = copyError(expected);
}
if (kMethodsWithCustomMessageDiff.has(operator)) {
super(createErrDiff(actual, expected, operator, message, diff));
} else if (operator === 'notDeepStrictEqual' ||
operator === 'notStrictEqual') {
// In case the objects are equal but the operator requires unequal, show
// the first object and say A equals B
let base = kReadableOperator[operator];
const res = StringPrototypeSplit(inspectValue(actual), '\n');
// In case "actual" is an object or a function, it should not be
// reference equal.
if (operator === 'notStrictEqual' &&
((typeof actual === 'object' && actual !== null) ||
typeof actual === 'function')) {
base = kReadableOperator.notStrictEqualObject;
}
// Only remove lines in case it makes sense to collapse those.
if (res.length > 50 && diff !== 'full') {
res[46] = `${colors.blue}...${colors.white}`;
while (res.length > 47) {
ArrayPrototypePop(res);
}
}
// Only print a single input.
if (res.length === 1) {
super(`${base}${res[0].length > 5 ? '\n\n' : ' '}${res[0]}`);
} else {
super(`${base}\n\n${ArrayPrototypeJoin(res, '\n')}\n`);
}
} else {
let res = inspectValue(actual);
let other = inspectValue(expected);
const knownOperator = kReadableOperator[operator];
if (operator === 'notDeepEqual' && res === other) {
res = `${knownOperator}\n\n${res}`;
if (res.length > 1024 && diff !== 'full') {
res = `${StringPrototypeSlice(res, 0, 1021)}...`;
}
super(res);
} else {
if (res.length > kMaxLongStringLength && diff !== 'full') {
res = `${StringPrototypeSlice(res, 0, 509)}...`;
}
if (other.length > kMaxLongStringLength && diff !== 'full') {
other = `${StringPrototypeSlice(other, 0, 509)}...`;
}
if (operator === 'deepEqual') {
res = `${knownOperator}\n\n${res}\n\nshould loosely deep-equal\n\n`;
} else {
const newOp = kReadableOperator[`${operator}Unequal`];
if (newOp) {
res = `${newOp}\n\n${res}\n\nshould not loosely deep-equal\n\n`;
} else {
other = ` ${operator} ${other}`;
}
}
super(`${res}${other}`);
}
}
}
if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = limit;
this.generatedMessage = !message;
ObjectDefineProperty(this, 'name', {
__proto__: null,
value: 'AssertionError [ERR_ASSERTION]',
enumerable: false,
writable: true,
configurable: true,
});
this.code = 'ERR_ASSERTION';
if (details) {
this.actual = undefined;
this.expected = undefined;
this.operator = undefined;
for (let i = 0; i < details.length; i++) {
this['message ' + i] = details[i].message;
this['actual ' + i] = details[i].actual;
this['expected ' + i] = details[i].expected;
this['operator ' + i] = details[i].operator;
this['stack trace ' + i] = details[i].stack;
}
} else {
this.actual = actual;
this.expected = expected;
this.operator = operator;
}
ErrorCaptureStackTrace(this, stackStartFn || stackStartFunction);
// Create error message including the error code in the name.
this.stack; // eslint-disable-line no-unused-expressions
// Reset the name.
this.name = 'AssertionError';
this.diff = diff;
}
toString() {
return `${this.name} [${this.code}]: ${this.message}`;
}
[inspect.custom](recurseTimes, ctx) {
// Long strings should not be fully inspected.
const tmpActual = this.actual;
const tmpExpected = this.expected;
if (typeof this.actual === 'string') {
this.actual = addEllipsis(this.actual);
}
if (typeof this.expected === 'string') {
this.expected = addEllipsis(this.expected);
}
// This limits the `actual` and `expected` property default inspection to
// the minimum depth. Otherwise those values would be too verbose compared
// to the actual error message which contains a combined view of these two
// input values.
const result = inspect(this, {
...ctx,
customInspect: false,
depth: 0,
});
// Reset the properties after inspection.
this.actual = tmpActual;
this.expected = tmpExpected;
return result;
}
}
module.exports = AssertionError;