748 lines
22 KiB
JavaScript
748 lines
22 KiB
JavaScript
/**
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* @license
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* Copyright The Closure Library Authors.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Logging and debugging utilities.
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*
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* @see ../demos/debug.html
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*/
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goog.provide('goog.debug');
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goog.require('goog.array');
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goog.require('goog.debug.errorcontext');
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/** @define {boolean} Whether logging should be enabled. */
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goog.debug.LOGGING_ENABLED =
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goog.define('goog.debug.LOGGING_ENABLED', goog.DEBUG);
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/** @define {boolean} Whether to force "sloppy" stack building. */
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goog.debug.FORCE_SLOPPY_STACKS =
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goog.define('goog.debug.FORCE_SLOPPY_STACKS', false);
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/**
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* @define {boolean} TODO(user): Remove this hack once bug is resolved.
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*/
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goog.debug.CHECK_FOR_THROWN_EVENT =
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goog.define('goog.debug.CHECK_FOR_THROWN_EVENT', false);
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/**
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* Catches onerror events fired by windows and similar objects.
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* @param {function(Object)} logFunc The function to call with the error
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* information.
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* @param {boolean=} opt_cancel Whether to stop the error from reaching the
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* browser.
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* @param {Object=} opt_target Object that fires onerror events.
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* @suppress {strictMissingProperties} onerror is not defined as a property
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* on Object.
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*/
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goog.debug.catchErrors = function(logFunc, opt_cancel, opt_target) {
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'use strict';
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var target = opt_target || goog.global;
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var oldErrorHandler = target.onerror;
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var retVal = !!opt_cancel;
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/**
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* New onerror handler for this target. This onerror handler follows the spec
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* according to
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* http://www.whatwg.org/specs/web-apps/current-work/#runtime-script-errors
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* The spec was changed in August 2013 to support receiving column information
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* and an error object for all scripts on the same origin or cross origin
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* scripts with the proper headers. See
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* https://mikewest.org/2013/08/debugging-runtime-errors-with-window-onerror
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*
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* @param {string} message The error message. For cross-origin errors, this
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* will be scrubbed to just "Script error.". For new browsers that have
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* updated to follow the latest spec, errors that come from origins that
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* have proper cross origin headers will not be scrubbed.
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* @param {string} url The URL of the script that caused the error. The URL
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* will be scrubbed to "" for cross origin scripts unless the script has
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* proper cross origin headers and the browser has updated to the latest
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* spec.
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* @param {number} line The line number in the script that the error
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* occurred on.
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* @param {number=} opt_col The optional column number that the error
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* occurred on. Only browsers that have updated to the latest spec will
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* include this.
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* @param {Error=} opt_error The optional actual error object for this
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* error that should include the stack. Only browsers that have updated
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* to the latest spec will inlude this parameter.
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* @return {boolean} Whether to prevent the error from reaching the browser.
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*/
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target.onerror = function(message, url, line, opt_col, opt_error) {
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'use strict';
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if (oldErrorHandler) {
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oldErrorHandler(message, url, line, opt_col, opt_error);
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}
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logFunc({
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message: message,
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fileName: url,
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line: line,
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lineNumber: line,
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col: opt_col,
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error: opt_error
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});
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return retVal;
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};
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};
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/**
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* Creates a string representing an object and all its properties.
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* @param {Object|null|undefined} obj Object to expose.
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* @param {boolean=} opt_showFn Show the functions as well as the properties,
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* default is false.
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* @return {string} The string representation of `obj`.
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*/
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goog.debug.expose = function(obj, opt_showFn) {
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'use strict';
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if (typeof obj == 'undefined') {
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return 'undefined';
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}
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if (obj == null) {
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return 'NULL';
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}
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var str = [];
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for (var x in obj) {
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if (!opt_showFn && typeof obj[x] === 'function') {
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continue;
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}
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var s = x + ' = ';
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try {
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s += obj[x];
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} catch (e) {
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s += '*** ' + e + ' ***';
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}
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str.push(s);
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}
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return str.join('\n');
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};
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/**
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* Creates a string representing a given primitive or object, and for an
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* object, all its properties and nested objects. NOTE: The output will include
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* Uids on all objects that were exposed. Any added Uids will be removed before
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* returning.
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* @param {*} obj Object to expose.
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* @param {boolean=} opt_showFn Also show properties that are functions (by
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* default, functions are omitted).
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* @return {string} A string representation of `obj`.
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*/
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goog.debug.deepExpose = function(obj, opt_showFn) {
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'use strict';
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var str = [];
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// Track any objects where deepExpose added a Uid, so they can be cleaned up
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// before return. We do this globally, rather than only on ancestors so that
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// if the same object appears in the output, you can see it.
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var uidsToCleanup = [];
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var ancestorUids = {};
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var helper = function(obj, space) {
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'use strict';
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var nestspace = space + ' ';
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var indentMultiline = function(str) {
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'use strict';
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return str.replace(/\n/g, '\n' + space);
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};
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try {
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if (obj === undefined) {
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str.push('undefined');
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} else if (obj === null) {
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str.push('NULL');
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} else if (typeof obj === 'string') {
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str.push('"' + indentMultiline(obj) + '"');
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} else if (typeof obj === 'function') {
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str.push(indentMultiline(String(obj)));
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} else if (goog.isObject(obj)) {
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// Add a Uid if needed. The struct calls implicitly adds them.
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if (!goog.hasUid(obj)) {
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uidsToCleanup.push(obj);
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}
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var uid = goog.getUid(obj);
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if (ancestorUids[uid]) {
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str.push('*** reference loop detected (id=' + uid + ') ***');
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} else {
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ancestorUids[uid] = true;
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str.push('{');
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for (var x in obj) {
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if (!opt_showFn && typeof obj[x] === 'function') {
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continue;
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}
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str.push('\n');
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str.push(nestspace);
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str.push(x + ' = ');
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helper(obj[x], nestspace);
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}
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str.push('\n' + space + '}');
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delete ancestorUids[uid];
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}
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} else {
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str.push(obj);
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}
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} catch (e) {
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str.push('*** ' + e + ' ***');
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}
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};
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helper(obj, '');
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// Cleanup any Uids that were added by the deepExpose.
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for (var i = 0; i < uidsToCleanup.length; i++) {
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goog.removeUid(uidsToCleanup[i]);
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}
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return str.join('');
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};
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/**
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* Recursively outputs a nested array as a string.
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* @param {Array<?>} arr The array.
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* @return {string} String representing nested array.
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*/
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goog.debug.exposeArray = function(arr) {
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'use strict';
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var str = [];
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for (var i = 0; i < arr.length; i++) {
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if (Array.isArray(arr[i])) {
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str.push(goog.debug.exposeArray(arr[i]));
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} else {
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str.push(arr[i]);
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}
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}
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return '[ ' + str.join(', ') + ' ]';
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};
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/**
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* Normalizes the error/exception object between browsers.
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* @param {*} err Raw error object.
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* @return {{
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* message: (?|undefined),
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* name: (?|undefined),
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* lineNumber: (?|undefined),
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* fileName: (?|undefined),
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* stack: (?|undefined)
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* }} Representation of err as an Object. It will never return err.
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* @suppress {strictMissingProperties} properties not defined on err
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*/
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goog.debug.normalizeErrorObject = function(err) {
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'use strict';
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var href = goog.getObjectByName('window.location.href');
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if (err == null) {
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err = 'Unknown Error of type "null/undefined"';
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}
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if (typeof err === 'string') {
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return {
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'message': err,
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'name': 'Unknown error',
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'lineNumber': 'Not available',
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'fileName': href,
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'stack': 'Not available'
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};
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}
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var lineNumber, fileName;
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var threwError = false;
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try {
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lineNumber = err.lineNumber || err.line || 'Not available';
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} catch (e) {
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// Firefox 2 sometimes throws an error when accessing 'lineNumber':
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// Message: Permission denied to get property UnnamedClass.lineNumber
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lineNumber = 'Not available';
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threwError = true;
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}
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try {
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fileName = err.fileName || err.filename || err.sourceURL ||
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// $googDebugFname may be set before a call to eval to set the filename
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// that the eval is supposed to present.
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goog.global['$googDebugFname'] || href;
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} catch (e) {
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// Firefox 2 may also throw an error when accessing 'filename'.
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fileName = 'Not available';
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threwError = true;
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}
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var stack = goog.debug.serializeErrorStack_(err);
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// The IE Error object contains only the name and the message.
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// The Safari Error object uses the line and sourceURL fields.
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if (threwError || !err.lineNumber || !err.fileName || !err.stack ||
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!err.message || !err.name) {
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var message = err.message;
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if (message == null) {
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if (err.constructor && err.constructor instanceof Function) {
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var ctorName = err.constructor.name ?
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err.constructor.name :
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goog.debug.getFunctionName(err.constructor);
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message = 'Unknown Error of type "' + ctorName + '"';
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// TODO(user): Remove this hack once bug is resolved.
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if (goog.debug.CHECK_FOR_THROWN_EVENT && ctorName == 'Event') {
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try {
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message = message + ' with Event.type "' + (err.type || '') + '"';
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} catch (e) {
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// Just give up on getting more information out of the error object.
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}
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}
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} else {
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message = 'Unknown Error of unknown type';
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}
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// Avoid TypeError since toString could be missing from the instance
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// (e.g. if created Object.create(null)).
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if (typeof err.toString === 'function' &&
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Object.prototype.toString !== err.toString) {
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message += ': ' + err.toString();
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}
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}
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return {
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'message': message,
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'name': err.name || 'UnknownError',
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'lineNumber': lineNumber,
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'fileName': fileName,
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'stack': stack || 'Not available'
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};
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}
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// Standards error object
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// Typed !Object. Should be a subtype of the return type, but it's not.
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err.stack = stack;
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// Return non-standard error to allow for consistent result (eg. enumerable).
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return {
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'message': err.message,
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'name': err.name,
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'lineNumber': err.lineNumber,
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'fileName': err.fileName,
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'stack': err.stack
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};
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};
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/**
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* Serialize stack by including the cause chain of the exception if it exists.
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*
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*
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* @param {*} e an exception that may have a cause
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* @param {!Object=} seen set of cause that have already been serialized
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* @return {string}
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* @private
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* @suppress {missingProperties} properties not defined on cause and e
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*/
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goog.debug.serializeErrorStack_ = function(e, seen) {
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'use strict';
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if (!seen) {
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seen = {};
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}
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seen[goog.debug.serializeErrorAsKey_(e)] = true;
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var stack = e['stack'] || '';
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// Add cause if exists.
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var cause = e.cause;
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if (cause && !seen[goog.debug.serializeErrorAsKey_(cause)]) {
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stack += '\nCaused by: ';
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// Some browsers like Chrome add the error message as the first frame of the
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// stack, In this case we don't need to add it. Note: we don't use
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// String.startsWith method because it might have to be polyfilled.
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if (!cause.stack || cause.stack.indexOf(cause.toString()) != 0) {
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stack += (typeof cause === 'string') ? cause : cause.message + '\n';
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}
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stack += goog.debug.serializeErrorStack_(cause, seen);
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}
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return stack;
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};
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/**
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* Serialize an error to a string key.
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* @param {*} e an exception
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* @return {string}
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* @private
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*/
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goog.debug.serializeErrorAsKey_ = function(e) {
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'use strict';
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var keyPrefix = '';
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if (typeof e.toString === 'function') {
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keyPrefix = '' + e;
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}
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return keyPrefix + e['stack'];
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};
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/**
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* Converts an object to an Error using the object's toString if it's not
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* already an Error, adds a stacktrace if there isn't one, and optionally adds
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* an extra message.
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* @param {*} err The original thrown error, object, or string.
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* @param {string=} opt_message optional additional message to add to the
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* error.
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* @return {!Error} If err is an Error, it is enhanced and returned. Otherwise,
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* it is converted to an Error which is enhanced and returned.
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*/
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goog.debug.enhanceError = function(err, opt_message) {
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'use strict';
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var error;
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if (!(err instanceof Error)) {
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error = Error(err);
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if (Error.captureStackTrace) {
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// Trim this function off the call stack, if we can.
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Error.captureStackTrace(error, goog.debug.enhanceError);
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}
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} else {
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error = err;
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}
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if (!error.stack) {
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error.stack = goog.debug.getStacktrace(goog.debug.enhanceError);
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}
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if (opt_message) {
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// find the first unoccupied 'messageX' property
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var x = 0;
|
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while (error['message' + x]) {
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++x;
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}
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error['message' + x] = String(opt_message);
|
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}
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return error;
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};
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|
|
|
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/**
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* Converts an object to an Error using the object's toString if it's not
|
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* already an Error, adds a stacktrace if there isn't one, and optionally adds
|
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* context to the Error, which is reported by the closure error reporter.
|
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* @param {*} err The original thrown error, object, or string.
|
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* @param {!Object<string, string>=} opt_context Key-value context to add to the
|
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* Error.
|
|
* @return {!Error} If err is an Error, it is enhanced and returned. Otherwise,
|
|
* it is converted to an Error which is enhanced and returned.
|
|
*/
|
|
goog.debug.enhanceErrorWithContext = function(err, opt_context) {
|
|
'use strict';
|
|
var error = goog.debug.enhanceError(err);
|
|
if (opt_context) {
|
|
for (var key in opt_context) {
|
|
goog.debug.errorcontext.addErrorContext(error, key, opt_context[key]);
|
|
}
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|
}
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return error;
|
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};
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|
|
|
|
/**
|
|
* Gets the current stack trace. Simple and iterative - doesn't worry about
|
|
* catching circular references or getting the args.
|
|
* @param {number=} opt_depth Optional maximum depth to trace back to.
|
|
* @return {string} A string with the function names of all functions in the
|
|
* stack, separated by \n.
|
|
* @suppress {es5Strict}
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|
*/
|
|
goog.debug.getStacktraceSimple = function(opt_depth) {
|
|
'use strict';
|
|
if (!goog.debug.FORCE_SLOPPY_STACKS) {
|
|
var stack = goog.debug.getNativeStackTrace_(goog.debug.getStacktraceSimple);
|
|
if (stack) {
|
|
return stack;
|
|
}
|
|
// NOTE: browsers that have strict mode support also have native "stack"
|
|
// properties. Fall-through for legacy browser support.
|
|
}
|
|
|
|
var sb = [];
|
|
var fn = arguments.callee.caller;
|
|
var depth = 0;
|
|
|
|
while (fn && (!opt_depth || depth < opt_depth)) {
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sb.push(goog.debug.getFunctionName(fn));
|
|
sb.push('()\n');
|
|
|
|
try {
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|
fn = fn.caller;
|
|
} catch (e) {
|
|
sb.push('[exception trying to get caller]\n');
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|
break;
|
|
}
|
|
depth++;
|
|
if (depth >= goog.debug.MAX_STACK_DEPTH) {
|
|
sb.push('[...long stack...]');
|
|
break;
|
|
}
|
|
}
|
|
if (opt_depth && depth >= opt_depth) {
|
|
sb.push('[...reached max depth limit...]');
|
|
} else {
|
|
sb.push('[end]');
|
|
}
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|
|
|
return sb.join('');
|
|
};
|
|
|
|
|
|
/**
|
|
* Max length of stack to try and output
|
|
* @type {number}
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|
*/
|
|
goog.debug.MAX_STACK_DEPTH = 50;
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|
|
|
|
/**
|
|
* @param {Function} fn The function to start getting the trace from.
|
|
* @return {?string}
|
|
* @private
|
|
*/
|
|
goog.debug.getNativeStackTrace_ = function(fn) {
|
|
'use strict';
|
|
var tempErr = new Error();
|
|
if (Error.captureStackTrace) {
|
|
Error.captureStackTrace(tempErr, fn);
|
|
return String(tempErr.stack);
|
|
} else {
|
|
// IE10, only adds stack traces when an exception is thrown.
|
|
try {
|
|
throw tempErr;
|
|
} catch (e) {
|
|
tempErr = e;
|
|
}
|
|
var stack = tempErr.stack;
|
|
if (stack) {
|
|
return String(stack);
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
|
|
/**
|
|
* Gets the current stack trace, either starting from the caller or starting
|
|
* from a specified function that's currently on the call stack.
|
|
* @param {?Function=} fn If provided, when collecting the stack trace all
|
|
* frames above the topmost call to this function, including that call,
|
|
* will be left out of the stack trace.
|
|
* @return {string} Stack trace.
|
|
* @suppress {es5Strict}
|
|
*/
|
|
goog.debug.getStacktrace = function(fn) {
|
|
'use strict';
|
|
var stack;
|
|
if (!goog.debug.FORCE_SLOPPY_STACKS) {
|
|
// Try to get the stack trace from the environment if it is available.
|
|
var contextFn = fn || goog.debug.getStacktrace;
|
|
stack = goog.debug.getNativeStackTrace_(contextFn);
|
|
}
|
|
if (!stack) {
|
|
// NOTE: browsers that have strict mode support also have native "stack"
|
|
// properties. This function will throw in strict mode.
|
|
stack = goog.debug.getStacktraceHelper_(fn || arguments.callee.caller, []);
|
|
}
|
|
return stack;
|
|
};
|
|
|
|
|
|
/**
|
|
* Private helper for getStacktrace().
|
|
* @param {?Function} fn If provided, when collecting the stack trace all
|
|
* frames above the topmost call to this function, including that call,
|
|
* will be left out of the stack trace.
|
|
* @param {Array<!Function>} visited List of functions visited so far.
|
|
* @return {string} Stack trace starting from function fn.
|
|
* @suppress {es5Strict}
|
|
* @private
|
|
*/
|
|
goog.debug.getStacktraceHelper_ = function(fn, visited) {
|
|
'use strict';
|
|
var sb = [];
|
|
|
|
// Circular reference, certain functions like bind seem to cause a recursive
|
|
// loop so we need to catch circular references
|
|
if (goog.array.contains(visited, fn)) {
|
|
sb.push('[...circular reference...]');
|
|
|
|
// Traverse the call stack until function not found or max depth is reached
|
|
} else if (fn && visited.length < goog.debug.MAX_STACK_DEPTH) {
|
|
sb.push(goog.debug.getFunctionName(fn) + '(');
|
|
var args = fn.arguments;
|
|
// Args may be null for some special functions such as host objects or eval.
|
|
for (var i = 0; args && i < args.length; i++) {
|
|
if (i > 0) {
|
|
sb.push(', ');
|
|
}
|
|
var argDesc;
|
|
var arg = args[i];
|
|
switch (typeof arg) {
|
|
case 'object':
|
|
argDesc = arg ? 'object' : 'null';
|
|
break;
|
|
|
|
case 'string':
|
|
argDesc = arg;
|
|
break;
|
|
|
|
case 'number':
|
|
argDesc = String(arg);
|
|
break;
|
|
|
|
case 'boolean':
|
|
argDesc = arg ? 'true' : 'false';
|
|
break;
|
|
|
|
case 'function':
|
|
argDesc = goog.debug.getFunctionName(arg);
|
|
argDesc = argDesc ? argDesc : '[fn]';
|
|
break;
|
|
|
|
case 'undefined':
|
|
default:
|
|
argDesc = typeof arg;
|
|
break;
|
|
}
|
|
|
|
if (argDesc.length > 40) {
|
|
argDesc = argDesc.slice(0, 40) + '...';
|
|
}
|
|
sb.push(argDesc);
|
|
}
|
|
visited.push(fn);
|
|
sb.push(')\n');
|
|
|
|
try {
|
|
sb.push(goog.debug.getStacktraceHelper_(fn.caller, visited));
|
|
} catch (e) {
|
|
sb.push('[exception trying to get caller]\n');
|
|
}
|
|
|
|
} else if (fn) {
|
|
sb.push('[...long stack...]');
|
|
} else {
|
|
sb.push('[end]');
|
|
}
|
|
return sb.join('');
|
|
};
|
|
|
|
|
|
/**
|
|
* Gets a function name
|
|
* @param {Function} fn Function to get name of.
|
|
* @return {string} Function's name.
|
|
*/
|
|
goog.debug.getFunctionName = function(fn) {
|
|
'use strict';
|
|
if (goog.debug.fnNameCache_[fn]) {
|
|
return goog.debug.fnNameCache_[fn];
|
|
}
|
|
|
|
// Heuristically determine function name based on code.
|
|
var functionSource = String(fn);
|
|
if (!goog.debug.fnNameCache_[functionSource]) {
|
|
var matches = /function\s+([^\(]+)/m.exec(functionSource);
|
|
if (matches) {
|
|
var method = matches[1];
|
|
goog.debug.fnNameCache_[functionSource] = method;
|
|
} else {
|
|
goog.debug.fnNameCache_[functionSource] = '[Anonymous]';
|
|
}
|
|
}
|
|
|
|
return goog.debug.fnNameCache_[functionSource];
|
|
};
|
|
|
|
|
|
/**
|
|
* Makes whitespace visible by replacing it with printable characters.
|
|
* This is useful in finding diffrences between the expected and the actual
|
|
* output strings of a testcase.
|
|
* @param {string} string whose whitespace needs to be made visible.
|
|
* @return {string} string whose whitespace is made visible.
|
|
*/
|
|
goog.debug.makeWhitespaceVisible = function(string) {
|
|
'use strict';
|
|
return string.replace(/ /g, '[_]')
|
|
.replace(/\f/g, '[f]')
|
|
.replace(/\n/g, '[n]\n')
|
|
.replace(/\r/g, '[r]')
|
|
.replace(/\t/g, '[t]');
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the type of a value. If a constructor is passed, and a suitable
|
|
* string cannot be found, 'unknown type name' will be returned.
|
|
*
|
|
* <p>Forked rather than moved from {@link goog.asserts.getType_}
|
|
* to avoid adding a dependency to goog.asserts.
|
|
* @param {*} value A constructor, object, or primitive.
|
|
* @return {string} The best display name for the value, or 'unknown type name'.
|
|
*/
|
|
goog.debug.runtimeType = function(value) {
|
|
'use strict';
|
|
if (value instanceof Function) {
|
|
return value.displayName || value.name || 'unknown type name';
|
|
} else if (value instanceof Object) {
|
|
return /** @type {string} */ (value.constructor.displayName) ||
|
|
value.constructor.name || Object.prototype.toString.call(value);
|
|
} else {
|
|
return value === null ? 'null' : typeof value;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Hash map for storing function names that have already been looked up.
|
|
* @type {Object}
|
|
* @private
|
|
*/
|
|
goog.debug.fnNameCache_ = {};
|
|
|
|
|
|
/**
|
|
* Private internal function to support goog.debug.freeze.
|
|
* @param {T} arg
|
|
* @return {T}
|
|
* @template T
|
|
* @private
|
|
*/
|
|
goog.debug.freezeInternal_ = goog.DEBUG && Object.freeze || function(arg) {
|
|
'use strict';
|
|
return arg;
|
|
};
|
|
|
|
|
|
/**
|
|
* Freezes the given object, but only in debug mode (and in browsers that
|
|
* support it). Note that this is a shallow freeze, so for deeply nested
|
|
* objects it must be called at every level to ensure deep immutability.
|
|
* @param {T} arg
|
|
* @return {T}
|
|
* @template T
|
|
*/
|
|
goog.debug.freeze = function(arg) {
|
|
'use strict';
|
|
// NOTE: this compiles to nothing, but hides the possible side effect of
|
|
// freezeInternal_ from the compiler so that the entire call can be
|
|
// removed if the result is not used.
|
|
return {
|
|
valueOf: function() {
|
|
'use strict';
|
|
return goog.debug.freezeInternal_(arg);
|
|
}
|
|
}.valueOf();
|
|
};
|