// Domain Public by Eric Wendelin http://eriwen.com/ (2008)
//                  Luke Smith http://lucassmith.name/ (2008)
//                  Loic Dachary <loic@dachary.org> (2008)
//                  Johan Euphrosine <proppy@aminche.com> (2008)
//
// Information and discussions
// http://jspoker.pokersource.info/skin/test-printstacktrace.html
// http://eriwen.com/javascript/js-stack-trace/
// http://pastie.org/253058
// http://browsershots.org/http://jspoker.pokersource.info/skin/test-printstacktrace.html
//

//
// guessFunctionNameFromLines comes from firebug
//
// Software License Agreement (BSD License)
//
// Copyright (c) 2007, Parakey Inc.
// All rights reserved.
//
// Redistribution and use of this software in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above
//   copyright notice, this list of conditions and the
//   following disclaimer.
//
// * Redistributions in binary form must reproduce the above
//   copyright notice, this list of conditions and the
//   following disclaimer in the documentation and/or other
//   materials provided with the distribution.
//
// * Neither the name of Parakey Inc. nor the names of its
//   contributors may be used to endorse or promote products
//   derived from this software without specific prior
//   written permission of Parakey Inc.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
// IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

function printStackTrace(options) {
    if (options && options.guess) {
        var p = new printStackTrace.implementation();
        var result = p.run();
        return p.guessFunctions(result);
    }
    return (new printStackTrace.implementation()).run();
}

printStackTrace.implementation = function() {};

printStackTrace.implementation.prototype = {
    run: function() {
        mode = this.mode();
        if (mode != 'other') {
            try { (0)(); } catch (e) {
                return this[mode](e);
            }
        } else {
            return this.other(arguments.callee);
        }
    },

    mode: function() {
        var mode;
        try { (0)(); } catch (e) {
            if (e.arguments) {
                mode = 'chrome';
            } else if (e.stack) {
                mode = 'firefox';
            } else {
                mode = 'other';
            }
        }
        return mode;
    },

    chrome: function(e) {
        return e.stack.replace(/^.*?\n/, '').
        replace(/^.*?\n/, '').
        replace(/^.*?\n/, '').
        replace(/^[^\(]+?[\n$]/gm, '').
        replace(/^\s+at\s+/gm, '').
        replace(/^Object.<anonymous>/gm, '{anonymous}()').
        split("\n");
    },

    firefox: function(e) {
        return e.stack.replace(/^.*?\n/, '').
        replace(/(?:\n@:0)?\s+$/m, '').
        replace(/^\(/gm, '{anonymous}(').
        split("\n");
    },

    other: function(curr) {
        var ANON = "{anonymous}",
        fnRE = /function\s*([\w\-$]+)?\s*\(/i,
        stack = [], j = 0, fn, args;

        var maxStackSize = 10;
        while (curr && stack.length < maxStackSize) {
            fn = fnRE.test(curr.toString()) ? RegExp.$1 || ANON : ANON;
            args = Array.prototype.slice.call(curr['arguments']);
            stack[j++] = fn + '(' + printStackTrace.implementation.prototype.stringifyArguments(args) + ')';

            //Opera bug: if curr.caller does not exist, Opera returns curr (WTF)
            if (curr === curr.caller && window.opera) {
                break;
            }
            curr = curr.caller;
        }
        return stack;
    },

    stringifyArguments: function(args) {
        var stringified = '\n';

        for (var i = 0; i < args.length; ++i) {
            var argument = args[i];
            if (argument === null) {
                args[i] = 'null';
            } else if (typeof argument == 'object') {
                args[i] = print_r(argument);
            } else if (typeof argument == 'function') {
                args[i] = '#function';
            } else if (typeof argument == 'string') {
                args[i] = '"' + argument + '"';
            }
        }
        stringified += args.join('\n\n,');
        stringified += '\n\n'

        return stringified;
    },

    sourceCache: {},

    ajax: function(url) {
        var req = this.createXMLHTTPObject();
        if (!req) {
            return;
        }
        req.open('GET', url, false);
        req.setRequestHeader("User-Agent", "XMLHTTP/1.0");
        req.send('');
        return req.responseText;
    },

    createXMLHTTPObject: function() {
        var XMLHttpFactories = [
		    function() {
		        return new XMLHttpRequest();
		    },
		    function() {
		        return new ActiveXObject("Msxml2.XMLHTTP");
		    },
		    function() {
		        return new ActiveXObject("Msxml3.XMLHTTP");
		    },
		    function() {
		        return new ActiveXObject("Microsoft.XMLHTTP");
		    }
		];
        var xmlhttp = false;
        for (var i = 0; i < XMLHttpFactories.length; i++) {
            try {
                xmlhttp = XMLHttpFactories[i]();
            }
            catch (e) {
                e = null;
                continue;
            }
            break;
        }
        return xmlhttp;
    },

    getSource: function(url) {
        var self = this;
        if (!(url in self.sourceCache)) {
            self.sourceCache[url] = self.ajax(url).split("\n");
        }
        return self.sourceCache[url];
    },

    guessFunctions: function(stack) {
        for (var i = 0; i < stack.length; ++i) {
            var reStack = /{anonymous}\(.*\)@(.*):(\d+)/;
            var frame = stack[i];
            var m = reStack.exec(frame);
            if (m) {
                var file = m[1];
                var lineno = m[2];
                if (file && lineno) {
                    var functionName = this.guessFunctionName(file, lineno);
                    stack[i] = frame.replace('{anonymous}', functionName);
                }
            }
        }
        return stack;
    },

    guessFunctionName: function(url, lineNo) {
        var source;
        try {
            source = this.getSource(url);
        } catch (e) {
            return 'getSource failed with url: ' + url + ', exception: ' + e.toString();
        }
        return this.guessFunctionNameFromLines(lineNo, source);
    },

    guessFunctionNameFromLines: function(lineNo, source) {
        var reFunctionArgNames = /function ([^(]*)\(([^)]*)\)/;
        var reGuessFunction = /['"]?([0-9A-Za-z_]+)['"]?\s*[:=]\s*(function|eval|new Function)/;
        // Walk backwards from the first line in the function until we find the line which
        // matches the pattern above, which is the function definition
        var line = "";
        var maxLines = 10;
        for (var i = 0; i < maxLines; ++i) {
            line = source[lineNo - i] + line;
            if (line !== undefined) {
                var m = reGuessFunction.exec(line);
                if (m) {
                    return m[1];
                } else {
                    m = reFunctionArgNames.exec(line);
                }
                if (m && m[1]) {
                    return m[1];
                }
            }
        }
        return "(?)";
    }
};