logger call site.js

'use strict';

var format = require('util').format;

function Logger() {
}

Logger.prototype.log = function $$Logger_log(msg) {
    var context = this.getContext();
    console.log(format('%s:%s:%s(%s): %s', context.pathname, context.lno, context.col, context.func, msg));
}

Logger.prototype.getContext = function $$Logger_getContext() {
    try {
        throw new Error();
    } catch (e) {
        var frames = e.stack.split('\n');
        for (var i = 0; i < frames.length; i++) {
            var frame = frames[i].trim();
            if (frame.indexOf('$$Logger') !== -1 || frame.indexOf('at') === -1) {
                continue;
            }
            var groups = /at (\S+) .*\((.*):(\d+):(\d+)\)/.exec(frame);
            return {
                func: groups[1] || '',
                pathname: groups[2],
                lno: groups[3],
                col: groups[4]
            };
        }
        return {
            func: '',
            pathname: '',
            lno: '',
            col: ''
        };
    }
}

function g() {
    var log = new Logger();
    log.log('hi there');
}

g();