/*
 * yui-ext 0.33
 * Copyright(c) 2006, Jack Slocum.
 */

/*
 * All the Date functions below are the excellent work of Baron Schwartz
 * They generate precompiled functions from date formats instead of parsing and processing
 * the format everytime you do something with a date.
 */
/** @ignore */
Date.parseFunctions = {count:0};
/** @ignore */
Date.parseRegexes = [];
/** @ignore */
Date.formatFunctions = {count:0};

/**
 * Formats a date given to the supplied format - the format syntax is the same as <a href="http://www.php.net/date">PHP's date() function</a>.
 */
Date.prototype.dateFormat = function(format) {
    if (Date.formatFunctions[format] == null) {
        Date.createNewFormat(format);
    }
    var func = Date.formatFunctions[format];
    return this[func]();
};

/**
 * Same as {@link #dateFormat}
 */
Date.prototype.format = Date.prototype.dateFormat;

/** @ignore */
Date.createNewFormat = function(format) {
    var funcName = "format" + Date.formatFunctions.count++;
    Date.formatFunctions[format] = funcName;
    var code = "Date.prototype." + funcName + " = function(){return ";
    var special = false;
    var ch = '';
    for (var i = 0; i < format.length; ++i) {
        ch = format.charAt(i);
        if (!special && ch == "\\") {
            special = true;
        }
        else if (special) {
            special = false;
            code += "'" + String.escape(ch) + "' + ";
        }
        else {
            code += Date.getFormatCode(ch);
        }
    }
    eval(code.substring(0, code.length - 3) + ";}");
};

/** @ignore */
Date.getFormatCode = function(character) {
    switch (character) {
    case "d":
        return "String.leftPad(this.getDate(), 2, '0') + ";
    case "D":
        return "Date.dayNames[this.getDay()].substring(0, 3) + ";
    case "j":
        return "this.getDate() + ";
    case "l":
        return "Date.dayNames[this.getDay()] + ";
    case "S":
        return "this.getSuffix() + ";
    case "w":
        return "this.getDay() + ";
    case "z":
        return "this.getDayOfYear() + ";
    case "W":
        return "this.getWeekOfYear() + ";
    case "F":
        return "Date.monthNames[this.getMonth()] + ";
    case "m":
        return "String.leftPad(this.getMonth() + 1, 2, '0') + ";
    case "M":
        return "Date.monthNames[this.getMonth()].substring(0, 3) + ";
    case "n":
        return "(this.getMonth() + 1) + ";
    case "t":
        return "this.getDaysInMonth() + ";
    case "L":
        return "(this.isLeapYear() ? 1 : 0) + ";
    case "Y":
        return "this.getFullYear() + ";
    case "y":
        return "('' + this.getFullYear()).substring(2, 4) + ";
    case "a":
        return "(this.getHours() < 12 ? 'am' : 'pm') + ";
    case "A":
        return "(this.getHours() < 12 ? 'AM' : 'PM') + ";
    case "g":
        return "((this.getHours() %12) ? this.getHours() % 12 : 12) + ";
    case "G":
        return "this.getHours() + ";
    case "h":
        return "String.leftPad((this.getHours() %12) ? this.getHours() % 12 : 12, 2, '0') + ";
    case "H":
        return "String.leftPad(this.getHours(), 2, '0') + ";
    case "i":
        return "String.leftPad(this.getMinutes(), 2, '0') + ";
    case "s":
        return "String.leftPad(this.getSeconds(), 2, '0') + ";
    case "O":
        return "this.getGMTOffset() + ";
    case "T":
        return "this.getTimezone() + ";
    case "Z":
        return "(this.getTimezoneOffset() * -60) + ";
    default:
        return "'" + String.escape(character) + "' + ";
    };
};

/**
 * Parses a date given the supplied format - the format syntax is the same as <a href="http://www.php.net/date">PHP's date() function</a>.
 */
Date.parseDate = function(input, format) {
    if (Date.parseFunctions[format] == null) {
        Date.createParser(format);
    }
    var func = Date.parseFunctions[format];
    return Date[func](input);
};

/** @ignore */
Date.createParser = function(format) {
    var funcName = "parse" + Date.parseFunctions.count++;
    var regexNum = Date.parseRegexes.length;
    var currentGroup = 1;
    Date.parseFunctions[format] = funcName;

    var code = "Date." + funcName + " = function(input){\n"
        + "var y = -1, m = -1, d = -1, h = -1, i = -1, s = -1;\n"
        + "var d = new Date();\n"
        + "y = d.getFullYear();\n"
        + "m = d.getMonth();\n"
        + "d = d.getDate();\n"
        + "var results = input.match(Date.parseRegexes[" + regexNum + "]);\n"
        + "if (results && results.length > 0) {"
    var regex = "";

    var special = false;
    var ch = '';
    for (var i = 0; i < format.length; ++i) {
        ch = format.charAt(i);
        if (!special && ch == "\\") {
            special = true;
        }
        else if (special) {
            special = false;
            regex += String.escape(ch);
        }
        else {
            obj = Date.formatCodeToRegex(ch, currentGroup);
            currentGroup += obj.g;
            regex += obj.s;
            if (obj.g && obj.c) {
                code += obj.c;
            }
        }
    }

    code += "if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0 && s >= 0)\n"
        + "{return new Date(y, m, d, h, i, s);}\n"
        + "else if (y > 0 && m >= 0 && d > 0 && h >= 0 && i >= 0)\n"
        + "{return new Date(y, m, d, h, i);}\n"
        + "else if (y > 0 && m >= 0 && d > 0 && h >= 0)\n"
        + "{return new Date(y, m, d, h);}\n"
        + "else if (y > 0 && m >= 0 && d > 0)\n"
        + "{return new Date(y, m, d);}\n"
        + "else if (y > 0 && m >= 0)\n"
        + "{return new Date(y, m);}\n"
        + "else if (y > 0)\n"
        + "{return new Date(y);}\n"
        + "}return null;}";

    Date.parseRegexes[regexNum] = new RegExp("^" + regex + "$");
    eval(code);
};

/** @ignore */
Date.formatCodeToRegex = function(character, currentGroup) {
    switch (character) {
    case "D":
        return {g:0,
        c:null,
        s:"(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)"};
    case "j":
    case "d":
        return {g:1,
            c:"d = parseInt(results[" + currentGroup + "], 10);\n",
            s:"(\\d{1,2})"};
    case "l":
        return {g:0,
            c:null,
            s:"(?:" + Date.dayNames.join("|") + ")"};
    case "S":
        return {g:0,
            c:null,
            s:"(?:st|nd|rd|th)"};
    case "w":
        return {g:0,
            c:null,
            s:"\\d"};
    case "z":
        return {g:0,
            c:null,
            s:"(?:\\d{1,3})"};
    case "W":
        return {g:0,
            c:null,
            s:"(?:\\d{2})"};
    case "F":
        return {g:1,
            c:"m = parseInt(Date.monthNumbers[results[" + currentGroup + "].substring(0, 3)], 10);\n",
            s:"(" + Date.monthNames.join("|") + ")"};
    case "M":
        return {g:1,
            c:"m = parseInt(Date.monthNumbers[results[" + currentGroup + "]], 10);\n",
            s:"(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)"};
    case "n":
    case "m":
        return {g:1,
            c:"m = parseInt(results[" + currentGroup + "], 10) - 1;\n",
            s:"(\\d{1,2})"};
    case "t":
        return {g:0,
            c:null,
            s:"\\d{1,2}"};
    case "L":
        return {g:0,
            c:null,
            s:"(?:1|0)"};
    case "Y":
        return {g:1,
            c:"y = parseInt(results[" + currentGroup + "], 10);\n",
            s:"(\\d{4})"};
    case "y":
        return {g:1,
            c:"var ty = parseInt(results[" + currentGroup + "], 10);\n"
                + "y = ty > Date.y2kYear ? 1900 + ty : 2000 + ty;\n",
            s:"(\\d{1,2})"};
    case "a":
        return {g:1,
            c:"if (results[" + currentGroup + "] == 'am') {\n"
                + "if (h == 12) { h = 0; }\n"
                + "} else { if (h < 12) { h += 12; }}",
            s:"(am|pm)"};
    case "A":
        return {g:1,
            c:"if (results[" + currentGroup + "] == 'AM') {\n"
                + "if (h == 12) { h = 0; }\n"
                + "} else { if (h < 12) { h += 12; }}",
            s:"(AM|PM)"};
    case "g":
    case "G":
    case "h":
    case "H":
        return {g:1,
            c:"h = parseInt(results[" + currentGroup + "], 10);\n",
            s:"(\\d{1,2})"};
    case "i":
        return {g:1,
            c:"i = parseInt(results[" + currentGroup + "], 10);\n",
            s:"(\\d{2})"};
    case "s":
        return {g:1,
            c:"s = parseInt(results[" + currentGroup + "], 10);\n",
            s:"(\\d{2})"};
    case "O":
        return {g:0,
            c:null,
            s:"[+-]\\d{4}"};
    case "T":
        return {g:0,
            c:null,
            s:"[A-Z]{3}"};
    case "Z":
        return {g:0,
            c:null,
            s:"[+-]\\d{1,5}"};
    default:
        return {g:0,
            c:null,
            s:String.escape(character)};
    }
};

Date.prototype.getTimezone = function() {
    return this.toString().replace(
        /^.*? ([A-Z]{3}) [0-9]{4}.*$/, "$1").replace(
        /^.*?\(([A-Z])[a-z]+ ([A-Z])[a-z]+ ([A-Z])[a-z]+\)$/, "$1$2$3");
};

Date.prototype.getGMTOffset = function() {
    return (this.getTimezoneOffset() > 0 ? "-" : "+")
        + String.leftPad(Math.floor(this.getTimezoneOffset() / 60), 2, "0")
        + String.leftPad(this.getTimezoneOffset() % 60, 2, "0");
};

Date.prototype.getDayOfYear = function() {
    var num = 0;
    Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
    for (var i = 0; i < this.getMonth(); ++i) {
        num += Date.daysInMonth[i];
    }
    return num + this.getDate() - 1;
};

Date.prototype.getWeekOfYear = function() {
    // Skip to Thursday of this week
    var now = this.getDayOfYear() + (4 - this.getDay());
    // Find the first Thursday of the year
    var jan1 = new Date(this.getFullYear(), 0, 1);
    var then = (7 - jan1.getDay() + 4);
    return String.leftPad(((now - then) / 7) + 1, 2, "0");
};

Date.prototype.isLeapYear = function() {
    var year = this.getFullYear();
    return ((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)));
};

Date.prototype.getFirstDayOfMonth = function() {
    var day = (this.getDay() - (this.getDate() - 1)) % 7;
    return (day < 0) ? (day + 7) : day;
};

Date.prototype.getLastDayOfMonth = function() {
    var day = (this.getDay() + (Date.daysInMonth[this.getMonth()] - this.getDate())) % 7;
    return (day < 0) ? (day + 7) : day;
};

Date.prototype.getDaysInMonth = function() {
    Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
    return Date.daysInMonth[this.getMonth()];
};

/** @ignore */
Date.prototype.getSuffix = function() {
    switch (this.getDate()) {
        case 1:
        case 21:
        case 31:
            return "st";
        case 2:
        case 22:
            return "nd";
        case 3:
        case 23:
            return "rd";
        default:
            return "th";
    }
};

/** @ignore */
Date.daysInMonth = [31,28,31,30,31,30,31,31,30,31,30,31];

/**
 * Override these values for international dates, for example...
 * Date.monthNames = ['JanInYourLang', 'FebInYourLang', ...];
 */
Date.monthNames =
   ["January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"];
    
/**
 * Override these values for international dates, for example...
 * Date.dayNames = ['SundayInYourLang', 'MondayInYourLang', ...];
 */
Date.dayNames =
   ["Sunday",
    "Monday",
    "Tuesday",
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday"];

/** @ignore */
Date.y2kYear = 50;

/** @ignore */
Date.monthNumbers = {
    Jan:0,
    Feb:1,
    Mar:2,
    Apr:3,
    May:4,
    Jun:5,
    Jul:6,
    Aug:7,
    Sep:8,
    Oct:9,
    Nov:10,
    Dec:11};