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6f278e3b4c
This way, in Firefox 31, the "main content" of the debug call will not have any extra whitespace on the left of it.
148 lines
3.2 KiB
JavaScript
148 lines
3.2 KiB
JavaScript
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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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