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1.1.2
by Leo Iannacone
Import upstream version 2.0.0+dfsg |
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/**
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* This is the web browser implementation of `debug()`.
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*
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* Expose `debug()` as the module.
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*/
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exports = module.exports = require('./debug'); |
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exports.log = log; |
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exports.formatArgs = formatArgs; |
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exports.save = save; |
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exports.load = load; |
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exports.useColors = useColors; |
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/**
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* Colors.
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*/
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exports.colors = [ |
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'lightseagreen', |
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'forestgreen', |
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'goldenrod', |
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'dodgerblue', |
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'darkorchid', |
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'crimson'
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];
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/**
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* Currently only WebKit-based Web Inspectors, Firefox >= v31,
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* and the Firebug extension (any Firefox version) are known
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* to support "%c" CSS customizations.
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*
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* TODO: add a `localStorage` variable to explicitly enable/disable colors
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*/
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function useColors() { |
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// is webkit? http://stackoverflow.com/a/16459606/376773
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return ('WebkitAppearance' in document.documentElement.style) || |
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// is firebug? http://stackoverflow.com/a/398120/376773
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(window.console && (console.firebug || (console.exception && console.table))) || |
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// is firefox >= v31?
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// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
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(navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31); |
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}
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/**
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* Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
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*/
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exports.formatters.j = function(v) { |
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return JSON.stringify(v); |
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};
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/**
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* Colorize log arguments if enabled.
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*
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* @api public
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*/
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function formatArgs() { |
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var args = arguments; |
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var useColors = this.useColors; |
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args[0] = (useColors ? '%c' : '') |
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+ this.namespace |
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+ (useColors ? ' %c' : ' ') |
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+ args[0] |
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+ (useColors ? '%c ' : ' ') |
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+ '+' + exports.humanize(this.diff); |
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if (!useColors) return args; |
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var c = 'color: ' + this.color; |
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args = [args[0], c, 'color: inherit'].concat(Array.prototype.slice.call(args, 1)); |
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// the final "%c" is somewhat tricky, because there could be other
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// arguments passed either before or after the %c, so we need to
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// figure out the correct index to insert the CSS into
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var index = 0; |
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var lastC = 0; |
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args[0].replace(/%[a-z%]/g, function(match) { |
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if ('%%' === match) return; |
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index++; |
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if ('%c' === match) { |
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// we only are interested in the *last* %c
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// (the user may have provided their own)
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lastC = index; |
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}
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});
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args.splice(lastC, 0, c); |
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return args; |
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}
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/**
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* Invokes `console.log()` when available.
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* No-op when `console.log` is not a "function".
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*
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* @api public
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*/
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function log() { |
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// This hackery is required for IE8,
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// where the `console.log` function doesn't have 'apply'
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return 'object' == typeof console |
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&& 'function' == typeof console.log |
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&& Function.prototype.apply.call(console.log, console, arguments); |
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}
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/**
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* Save `namespaces`.
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*
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* @param {String} namespaces
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* @api private
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*/
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function save(namespaces) { |
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try { |
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if (null == namespaces) { |
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localStorage.removeItem('debug'); |
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} else { |
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localStorage.debug = namespaces; |
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}
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} catch(e) {} |
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}
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/**
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* Load `namespaces`.
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*
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* @return {String} returns the previously persisted debug modes
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* @api private
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*/
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function load() { |
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var r; |
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try { |
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r = localStorage.debug; |
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} catch(e) {} |
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return r; |
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}
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/**
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* Enable namespaces listed in `localStorage.debug` initially.
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*/
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exports.enable(load()); |
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