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96 lines
3.6 KiB
JavaScript
96 lines
3.6 KiB
JavaScript
/**
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* empower - Power Assert feature enhancer for assert function/object.
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*
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* https://github.com/power-assert-js/empower
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*
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* Copyright (c) 2013-2018 Takuto Wada
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* Licensed under the MIT license.
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* https://github.com/power-assert-js/empower/blob/master/MIT-LICENSE.txt
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*/
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var empowerCore = require('empower-core');
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var defaultOptions = require('./lib/default-options');
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var capturable = require('./lib/capturable');
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var assign = require('core-js/library/fn/object/assign');
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var define = require('./lib/define-properties');
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/**
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* Enhance Power Assert feature to assert function/object.
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* @param assert target assert function or object to enhance
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* @param formatter power assert format function
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* @param options enhancement options
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* @return enhanced assert function/object
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*/
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function empower (assert, formatter, options) {
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var config = assign(defaultOptions(), options);
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var eagerEvaluation = !(config.modifyMessageOnRethrow || config.saveContextOnRethrow);
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// see: https://github.com/power-assert-js/empower/pull/26
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var shouldRecreateAssertionError = (function isStackUnchanged () {
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if (typeof assert !== 'function') {
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return false;
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}
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if (typeof assert.AssertionError !== 'function') {
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return false;
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}
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var ae = new assert.AssertionError({
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actual: 123,
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expected: 456,
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operator: '==='
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});
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ae.message = '[REPLACED MESSAGE]';
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return !(/REPLACED MESSAGE/.test(ae.stack)) && /123 === 456/.test(ae.stack);
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})();
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var empowerCoreConfig = assign(config, {
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modifyMessageBeforeAssert: function (beforeAssertEvent) {
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var message = beforeAssertEvent.originalMessage;
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if (!eagerEvaluation) {
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return message;
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}
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return buildPowerAssertText(formatter, message, beforeAssertEvent.powerAssertContext);
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},
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onError: function onError (errorEvent) {
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var e = errorEvent.error;
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if (!/^AssertionError/.test(e.name)) {
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throw e;
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}
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if (!errorEvent.powerAssertContext) {
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throw e;
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}
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var poweredMessage;
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if (config.modifyMessageOnRethrow || config.saveContextOnRethrow) {
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poweredMessage = buildPowerAssertText(formatter, errorEvent.originalMessage, errorEvent.powerAssertContext);
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if (shouldRecreateAssertionError) {
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e = new assert.AssertionError({
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message: poweredMessage,
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actual: e.actual,
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expected: e.expected,
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operator: e.operator,
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stackStartFunction: e.stackStartFunction || onError
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});
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e.generatedMessage = false;
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}
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}
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if (config.modifyMessageOnRethrow && !shouldRecreateAssertionError) {
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e.message = poweredMessage;
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e.generatedMessage = false;
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}
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if (config.saveContextOnRethrow) {
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e.powerAssertContext = errorEvent.powerAssertContext;
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}
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throw e;
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}
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});
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var enhancedAssert = empowerCore(assert, empowerCoreConfig);
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define(enhancedAssert, capturable());
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return enhancedAssert;
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}
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function buildPowerAssertText (formatter, message, context) {
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// console.log(message);
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var powerAssertText = formatter(context);
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return message ? message + ' ' + powerAssertText : powerAssertText;
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};
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empower.defaultOptions = defaultOptions;
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module.exports = empower;
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