Alan K
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lib/debug.js
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lib/debug.js
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/*!
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* JavaScript Debug - v0.4 - 6/22/2010
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* http://benalman.com/projects/javascript-debug-console-log/
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*
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* Copyright (c) 2010 "Cowboy" Ben Alman
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* Dual licensed under the MIT and GPL licenses.
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* http://benalman.com/about/license/
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*
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* With lots of help from Paul Irish!
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* http://paulirish.com/
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*/
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// Script: JavaScript Debug: A simple wrapper for console.log
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//
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// *Version: 0.4, Last Updated: 6/22/2010*
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//
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// Tested with Internet Explorer 6-8, Firefox 3-3.6, Safari 3-4, Chrome 3-5, Opera 9.6-10.5
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//
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// Home - http://benalman.com/projects/javascript-debug-console-log/
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// GitHub - http://github.com/cowboy/javascript-debug/
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// Source - http://github.com/cowboy/javascript-debug/raw/master/ba-debug.js
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// (Minified) - http://github.com/cowboy/javascript-debug/raw/master/ba-debug.min.js (1.1kb)
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//
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// About: License
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//
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// Copyright (c) 2010 "Cowboy" Ben Alman,
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// Dual licensed under the MIT and GPL licenses.
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// http://benalman.com/about/license/
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//
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// About: Support and Testing
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//
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// Information about what browsers this code has been tested in.
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//
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// Browsers Tested - Internet Explorer 6-8, Firefox 3-3.6, Safari 3-4, Chrome
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// 3-5, Opera 9.6-10.5
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//
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// About: Examples
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//
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// These working examples, complete with fully commented code, illustrate a few
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// ways in which this plugin can be used.
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//
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// Examples - http://benalman.com/code/projects/javascript-debug/examples/debug/
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//
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// About: Revision History
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//
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// 0.4 - (6/22/2010) Added missing passthrough methods: exception,
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// groupCollapsed, table
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// 0.3 - (6/8/2009) Initial release
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//
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// Topic: Pass-through console methods
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//
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// assert, clear, count, dir, dirxml, exception, group, groupCollapsed,
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// groupEnd, profile, profileEnd, table, time, timeEnd, trace
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//
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// These console methods are passed through (but only if both the console and
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// the method exists), so use them without fear of reprisal. Note that these
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// methods will not be passed through if the logging level is set to 0 via
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// <debug.setLevel>.
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(function(define, console) {
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define(function() { "use strict";
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// Some convenient shortcuts.
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var aps = Array.prototype.slice,
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con = console,
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// Public object to be returned.
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that = {},
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callback_func,
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callback_force,
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// Default logging level, show everything.
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log_level = 9,
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// Logging methods, in "priority order". Not all console implementations
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// will utilize these, but they will be used in the callback passed to
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// setCallback.
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log_methods = [ 'error', 'warn', 'info', 'debug', 'log' ],
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// Pass these methods through to the console if they exist, otherwise just
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// fail gracefully. These methods are provided for convenience.
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pass_methods = 'assert clear count dir dirxml exception group groupCollapsed groupEnd profile profileEnd table time timeEnd trace'.split(' '),
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idx = pass_methods.length,
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// Logs are stored here so that they can be recalled as necessary.
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logs = [];
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while ( --idx >= 0 ) {
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(function( method ){
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// Generate pass-through methods. These methods will be called, if they
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// exist, as long as the logging level is non-zero.
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that[ method ] = function() {
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log_level !== 0 && con && con[ method ]
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&& con[ method ].apply( con, arguments );
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}
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})( pass_methods[idx] );
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}
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idx = log_methods.length;
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while ( --idx >= 0 ) {
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(function( idx, level ){
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// Method: debug.log
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//
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// Call the console.log method if available. Adds an entry into the logs
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// array for a callback specified via <debug.setCallback>.
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//
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// Usage:
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//
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// debug.log( object [, object, ...] ); - -
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//
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// Arguments:
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//
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// object - (Object) Any valid JavaScript object.
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// Method: debug.debug
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//
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// Call the console.debug method if available, otherwise call console.log.
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// Adds an entry into the logs array for a callback specified via
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// <debug.setCallback>.
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//
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// Usage:
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//
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// debug.debug( object [, object, ...] ); - -
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//
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// Arguments:
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//
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// object - (Object) Any valid JavaScript object.
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// Method: debug.info
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//
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// Call the console.info method if available, otherwise call console.log.
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// Adds an entry into the logs array for a callback specified via
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// <debug.setCallback>.
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//
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// Usage:
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//
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// debug.info( object [, object, ...] ); - -
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//
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// Arguments:
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//
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// object - (Object) Any valid JavaScript object.
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// Method: debug.warn
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//
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// Call the console.warn method if available, otherwise call console.log.
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// Adds an entry into the logs array for a callback specified via
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// <debug.setCallback>.
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//
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// Usage:
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//
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// debug.warn( object [, object, ...] ); - -
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//
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// Arguments:
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//
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// object - (Object) Any valid JavaScript object.
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// Method: debug.error
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//
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// Call the console.error method if available, otherwise call console.log.
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// Adds an entry into the logs array for a callback specified via
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// <debug.setCallback>.
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//
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// Usage:
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//
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// debug.error( object [, object, ...] ); - -
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//
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// Arguments:
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//
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// object - (Object) Any valid JavaScript object.
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that[ level ] = function() {
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var args = aps.call( arguments ),
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log_arr = [ level ].concat( args );
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logs.push( log_arr );
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exec_callback( log_arr );
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if ( !con || !is_level( idx ) ) { return; }
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con.firebug ? con[ level ].apply( window, args )
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: con[ level ] ? con[ level ].apply( window, args )
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: con.log.apply( window, args );
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};
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})( idx, log_methods[idx] );
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}
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// Execute the callback function if set.
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function exec_callback( args ) {
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if ( callback_func && (callback_force || !con || !con.log) ) {
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callback_func.apply( window, args );
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}
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};
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// Method: debug.setLevel
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//
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// Set a minimum or maximum logging level for the console. Doesn't affect
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// the <debug.setCallback> callback function, but if set to 0 to disable
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// logging, <Pass-through console methods> will be disabled as well.
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//
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// Usage:
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//
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// debug.setLevel( [ level ] ) - -
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//
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// Arguments:
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//
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// level - (Number) If 0, disables logging. If negative, shows N lowest
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// priority levels of log messages. If positive, shows N highest priority
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// levels of log messages.
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//
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// Priority levels:
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//
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// log (1) < debug (2) < info (3) < warn (4) < error (5)
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that.setLevel = function( level ) {
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log_level = typeof level === 'number' ? level : 9;
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};
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// Determine if the level is visible given the current log_level.
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function is_level( level ) {
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return log_level > 0
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? log_level > level
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: log_methods.length + log_level <= level;
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};
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// Method: debug.setCallback
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//
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// Set a callback to be used if logging isn't possible due to console.log
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// not existing. If unlogged logs exist when callback is set, they will all
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// be logged immediately unless a limit is specified.
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//
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// Usage:
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//
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// debug.setCallback( callback [, force ] [, limit ] )
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//
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// Arguments:
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//
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// callback - (Function) The aforementioned callback function. The first
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// argument is the logging level, and all subsequent arguments are those
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// passed to the initial debug logging method.
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// force - (Boolean) If false, log to console.log if available, otherwise
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// callback. If true, log to both console.log and callback.
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// limit - (Number) If specified, number of lines to limit initial scrollback
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// to.
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that.setCallback = function() {
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var args = aps.call( arguments ),
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max = logs.length,
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i = max;
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callback_func = args.shift() || null;
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callback_force = typeof args[0] === 'boolean' ? args.shift() : false;
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i -= typeof args[0] === 'number' ? args.shift() : max;
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while ( i < max ) {
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exec_callback( logs[i++] );
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}
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};
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return that;
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});
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})(typeof define == 'function'
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? define
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: function (factory) { typeof exports != 'undefined'
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? (module.exports = factory())
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: (this.when = factory());
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},
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window.console
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// Boilerplate for AMD, Node, and browser global
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);
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