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/**
* Copyright (c) 2014, Facebook, Inc. All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*
*/
'use strict';
const ReactElementPlugin = require('pretty-format/build/plugins/ReactElement');
const ReactTestComponentPlugin = require('pretty-format/build/plugins/ReactTestComponent');
const AsymmetricMatcherPlugin = require('pretty-format/build/plugins/AsymmetricMatcher');
const chalk = require('chalk');
const diffStrings = require('./diffStrings');var _require =
require('jest-matcher-utils');const getType = _require.getType;
const prettyFormat = require('pretty-format');var _require2 =
require('./constants');const NO_DIFF_MESSAGE = _require2.NO_DIFF_MESSAGE,SIMILAR_MESSAGE = _require2.SIMILAR_MESSAGE;
const PLUGINS = [
ReactTestComponentPlugin,
ReactElementPlugin,
AsymmetricMatcherPlugin];
const FORMAT_OPTIONS = {
plugins: PLUGINS };
const FALLBACK_FORMAT_OPTIONS = {
callToJSON: false,
maxDepth: 10,
plugins: PLUGINS };
// Generate a string that will highlight the difference between two values
// with green and red. (similar to how github does code diffing)
function diff(a, b, options) {
if (a === b) {
return NO_DIFF_MESSAGE;
}
const aType = getType(a);
let expectedType = aType;
let omitDifference = false;
if (aType === 'object' && typeof a.asymmetricMatch === 'function') {
if (a.$$typeof !== Symbol.for('jest.asymmetricMatcher')) {
// Do not know expected type of user-defined asymmetric matcher.
return null;
}
if (typeof a.getExpectedType !== 'function') {
// For example, expect.anything() matches either null or undefined
return null;
}
expectedType = a.getExpectedType();
// Primitive types boolean and number omit difference below.
// For example, omit difference for expect.stringMatching(regexp)
omitDifference = expectedType === 'string';
}
if (expectedType !== getType(b)) {
return (
' Comparing two different types of values.' +
` Expected ${chalk.green(expectedType)} but ` +
`received ${chalk.red(getType(b))}.`);
}
if (omitDifference) {
return null;
}
switch (aType) {
case 'string':
const multiline = a.match(/[\r\n]/) !== -1 && b.indexOf('\n') !== -1;
if (multiline) {
return diffStrings(String(a), String(b), options);
}
return null;
case 'number':
case 'boolean':
return null;
case 'map':
return compareObjects(sortMap(a), sortMap(b), options);
case 'set':
return compareObjects(sortSet(a), sortSet(b), options);
default:
return compareObjects(a, b, options);}
}
function sortMap(map) {
return new Map(Array.from(map.entries()).sort());
}
function sortSet(set) {
return new Set(Array.from(set.values()).sort());
}
function compareObjects(a, b, options) {
let diffMessage;
let hasThrown = false;
try {
diffMessage = diffStrings(
prettyFormat(a, FORMAT_OPTIONS),
prettyFormat(b, FORMAT_OPTIONS),
options);
} catch (e) {
hasThrown = true;
}
// If the comparison yields no results, compare again but this time
// without calling `toJSON`. It's also possible that toJSON might throw.
if (!diffMessage || diffMessage === NO_DIFF_MESSAGE) {
diffMessage = diffStrings(
prettyFormat(a, FALLBACK_FORMAT_OPTIONS),
prettyFormat(b, FALLBACK_FORMAT_OPTIONS),
options);
if (diffMessage !== NO_DIFF_MESSAGE && !hasThrown) {
diffMessage = SIMILAR_MESSAGE + '\n\n' + diffMessage;
}
}
return diffMessage;
}
module.exports = diff;
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