/*
Core JavaScript Library
$Id: core.js 17432 2005-09-13 23:25:57Z ydnar $

Copyright (c) 2005, Six Apart, Ltd.
All rights reserved.

Redistribution and use 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 "Six Apart" nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

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.

*/


/* stubs */

log = function() {}


/* utility functions */

defined = function( x ) {
    try {
        if( typeof x != "undefined" )
            return true;
    }
    catch( e ) {}
    return false;
}


finite = function( x ) {
    return isFinite( x ) ? x : 0;
}


finiteInt = function( x, base ) {
    return finite( parseInt( x, base ) );
}


finiteFloat = function( x ) {
    return finite( parseFloat( x ) );
}


max = function() {
    var n = arguments[ 0 ];
    for( var i = 1; i < arguments.length; i++ )
        if( arguments[ i ] > n )
            n = arguments[ i ];
    return n;
}


min = function() {
    var n = arguments[ 0 ];
    for( var i = 1; i < arguments.length; i++ )
        if( arguments[ i ] < n )
            n = arguments[ i ];
    return n;
}


/* try block */

Try = {
    these: function() {
        for( var i = 0; i < arguments.length; i++ ) {
            try {
                return arguments[ i ]();
            } catch( e ) {}
        }
        return undefined;
    }
}


/* unique id generator */

Unique = {
    length: 0,
    
    id: function() {
        return ++this.length;
    }
}


/* object extensions */

if( !Object.prototype.hasOwnProperty ) {
    Object.prototype.hasOwnProperty = function( property ) {
        try {
            var prototype = this.constructor.prototype;
            while( prototype ) {
                if( prototype[ property ] == this[ property ] ) {
                    return false;
                }
                prototype = prototype.prototype;
            }
        } catch( e ) {}
        return true;
    }
}


if( !Object.prototype.hasOwnMethod ) {
    Object.prototype.hasOwnMethod = function( property ) {
        try {
            if( this.hasOwnProperty( property ) && typeof this[ property ] == "function" )
                return true;
        } catch( e ) {}
        return false;
    }
}


Object.prototype.extend = function() {
    for( var i = 0; i < arguments.length; i++ ) {
        var object = arguments[ i ];
        for( var property in object ) {
            try {
                if( !this[ property ] &&
                    object.hasOwnProperty( property ) )
                    this[ property ] = object[ property ];
            } catch( e ) {}
        }
    }
    return this;
}


Object.prototype.override = function() {
    for( var i = 0; i < arguments.length; i++ ) {
        var object = arguments[ i ];
        for( var property in object ) {
            try {
                if( object.hasOwnProperty( property ) )
                    this[ property ] = object[ property ];
            } catch( e ) {}
        }
    }
    return this;
}


Object.prototype.extend( {
    init: function() {},
    
    
    destroy: function() {
        for( var property in this ) {
            try {
                if( this.hasOwnProperty( property ) )
                    delete this[ property ];
            } catch( e ) {}
        }
    }
} );



/* function extensions */

Function.extend( {
    stub: function() {}
} );


Function.prototype.extend( {
    bind: function( object ) {
        var method = this;
        return function() {
            return function() {
                return method.apply( object, arguments );
            };
        }();
    },
    
    
    bindEventListener: function( object ) {
        var method = this;
        return function() {
            return function( event ) {
                event = Event.prep( event );
                return method.call( object, event );
            };
        }();
    }
} );


/* class helpers */

Class = function( superClass ) {
    var constructor = function() {
        if( arguments.length )
            this.init.apply( this, arguments );
    };
    
    constructor.extend( Class );
    superClass = superClass || Object;
    constructor.superClass = superClass.prototype;
    constructor.prototype = new superClass();
    constructor.prototype.extend( Class.prototype );
    for( var i = 1; i < arguments.length; i++ )
        constructor.prototype.override( arguments[ i ] );
    
    return constructor;
}


Class.extend( {
    initSingleton: function() {
        if( this.singleton )
            throw "multiple singleton initialization";
        this.singleton = this.singletonConstructor
            ? new this.singletonConstructor()
            : new this();
        this.singleton.init.apply( this.singleton, arguments );
        return this.singleton;
    }
} );


Class.prototype = {
    init: Function.stub,
    destroy: Function.stub
}


/* string extensions */

String.extend( {
    escapeJSChar: function( c ) {
        // try simple escaping
        switch( c ) {
            case "\\": return "\\";
            case "\"": return "\\\"";
            case "'":  return "\\'";
            case "\b": return "\\b";
            case "\f": return "\\f";
            case "\n": return "\\n";
            case "\r": return "\\r";
            case "\t": return "\\t";
        }
        
        // try printable
        if( c >= " " && c <= "~" )
            return c;
        
        // try \uXXXX escaping
        c = c.charCodeAt( 0 ).toString( 16 );
        switch( c.length ) {
            case 1: return "\\u000" + c;
            case 2: return "\\u00" + c;
            case 3: return "\\u0" + c;
            case 4: return "\\u" + c;
        }
        
        // should never make it here
        return "";
    }
} );


String.prototype.extend( {
    escapeJSChar: function( c ) {
        // try simple escaping
        switch( c ) {
            case "\\": return "\\";
            case "\"": return "\\\"";
            case "'":  return "\\'";
            case "\b": return "\\b";
            case "\f": return "\\f";
            case "\n": return "\\n";
            case "\r": return "\\r";
            case "\t": return "\\t";
        }
        
        // try printable
        if( c >= " " && c <= "~" )
            return c;
        
        // try \uXXXX escaping
        c = c.charCodeAt( 0 ).toString( 16 );
        switch( c.length ) {
            case 1: return "\\u000" + c;
            case 2: return "\\u00" + c;
            case 3: return "\\u0" + c;
            case 4: return "\\u" + c;
        }
        
        // should never make it here
        return "";
    },


    cssToJS: function() {
        return this.replace( /-([a-z])/g, function( m, c ) { return c.toUpperCase() } );
    },
    
    
    jsToCSS: function() {
        return this.replace( /([A-Z])/g, function( m, c ) { return "-" + c.toLowerCase() } );
    },
    
    
    pad: function( length, padChar ) {
        var padding = length - this.length;
        if( padding <= 0 )
            return this;
        if( !defined( padChar ) )
            padChar = " ";
        var out = [];
        for( var i = 0; i < padding; i++ )
            out.push( padChar );
        out.push( this );
        return out.join( "" );
    }
} );


/* word-based regexp constructor */

RegExp.Words = function( pattern, flags ) {
    var words;
    switch( pattern.constructor ) {
        case RegExp:
            return pattern;
        case Array:
            words = pattern;
            break;
        case Boolean:
        case Number:
        case Date:
            words = words.toString();
        case String:
            words = words.split( /\s+/g );
            break;
    }
    return new RegExp( [ "(^|\\s)(", words.join( "|" ), ")(\\s|$)" ].join( "" ), flags );
}


/* extend array object */

Array.prototype.extend( {
    copy: function() {
        var out = [];
        for( var i = 0; i < this.length; i++ )
            out[ i ] = this[ i ];
        return out;
    },


    first: function( callback, object ) {
        var length = this.length;
        for( var i = 0; i < length; i++ ) {
            var result = object
                ? callback.call( object, this[ i ], i, this )
                : callback( this[ i ], i, this );
            if( result )
                return this[ i ];
        }
        return null;
    },


    fitIndex: function( fromIndex, defaultIndex ) {
        if( !defined( fromIndex ) || fromIndex == null )
            fromIndex = defaultIndex;
        else if( fromIndex < 0 ) {
            fromIndex = this.length - fromIndex;
            if( fromIndex < 0 )
                fromIndex = 0;
        } else if( fromIndex > this.length )
            fromIndex = this.length;
        return fromIndex;
    },


    scramble: function() {
        for( var i = 0; i < this.length; i++ ) {
            var j = Math.floor( Math.random() * this.length );
            var temp = this[ i ];
            this[ i ] = this[ j ];
            this[ j ] = temp;
        }
    },
    
    
    add: function() {
        for( var i = 0; i < arguments.length; i++ ) {
            var index = this.indexOf( arguments[ i ] );
            if( index < 0 ) 
                this.push( arguments[ i ] );
        }
        return this.length;
    },
        
    
    remove: function() {
        var count = 0;
        for( var i = 0; i < arguments.length; i++ ) {
            var index = this.indexOf( arguments[ i ] );
            if( index >= 0 )
                this.splice( index, 1 );
        }
        return this.length;
    },


    /* javascript 1.5 array methods */
    /* http://developer-test.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Objects:Array#Methods */

    every: function( callback, object ) {
        var length = this.length;
        for( var i = 0; i < length; i++ ) {
            var result = object
                ? callback.call( object, this[ i ], i, this )
                : callback( this[ i ], i, this );
            if( !result )
                return false;
        }
        return true;
    },


    filter: function( callback, object ) {
        var out = [];
        var length = this.length;
        for( var i = 0; i < length; i++ ) {
            var result = object
                ? callback.call( object, this[ i ], i, this )
                : callback( this[ i ], i, this );
            if( result )
                out.push( this[ i ] );
        }
        return out;
    },
    
    
    forEach: function( callback, object ) {
        var length = this.length;
        for( var i = 0; i < length; i++ ) {
            object
                ? callback.call( object, this[ i ], i, this )
                : callback( this[ i ], i, this );
        }
    },
    
    
    indexOf: function( value, fromIndex ) {
        fromIndex = this.fitIndex( fromIndex, 0 );
        for( var i = 0; i < this.length; i++ ) {
            if( this[ i ] == value )
                return i;
        }
        return -1;
    },


    lastIndexOf: function( value, fromIndex ) {
        fromIndex = this.fitIndex( fromIndex, this.length );
        for( var i = fromIndex - 1; i >= 0; i-- ) {
            if( this[ i ] == value )
                return i;
        }
        return -1;
    },


    some: function( callback, object ) {
        var length = this.length;
        for( var i = 0; i < length; i++ ) {
            var result = object
                ? callback.call( object, this[ i ], i, this )
                : callback( this[ i ], i, this );
            if( result )
                return true;
        }
        return false;
    },


    /* javascript 1.2 array methods */

    concat: function() {
        var out = this.copy();
        for( i = 0; i < arguments.length; i++ ) {
            for( j = 0; j < arguments[ i ].length; j++ )
                out.push( arguments[ i ][ j ] );
        }
        return out;
    },
    

    push: function() {
        for( var i = 0; i < arguments.length; i++ )
            this[ this.length + 1 ] = arguments[ i ];
        return this.length;     
    },


    pop: function() {
        if( this.length == 0 )
            return undefined;
        var out = this[ this.length - 1 ];
        this.length--;
        return out;
    },
    
    
    unshift: function() {
        for( var i = 0; i < arguments.length; i++ ) {
            this[ i + arguments.length ] = this[ i ];
            this[ i ] = arguments[ i ];
        }
        return this.length;     
    },
    
    
    shift: function() {
        if( this.length == 0 )
            return undefined;
        var out = this[ 0 ];
        for( var i = 1; i < this.length; i++ )
            this[ i - 1 ] = this[ i ];
        this.length--;
        return out;
    }
} );


/* date extensions */

Date.extend( {
    /*  iso 8601 date format parser
        this was fun to write...
        thanks to: http://www.cl.cam.ac.uk/~mgk25/iso-time.html */

    matchISOString: new RegExp(
        "^([0-9]{4})" +                                                     // year
        "(?:-(?=0[1-9]|1[0-2])|$)(..)?" +                                   // month
        "(?:-(?=0[1-9]|[12][0-9]|3[01])|$)([0-9]{2})?" +                    // day of the month
        "(?:T(?=[01][0-9]|2[0-4])|$)T?([0-9]{2})?" +                        // hours
        "(?::(?=[0-5][0-9])|\\+|-|Z|$)([0-9]{2})?" +                        // minutes
        "(?::(?=[0-5][0-9]|60$|60[+|-|Z]|60.0+)|\\+|-|Z|$):?([0-9]{2})?" +  // seconds
        "(\.[0-9]+)?" +                                                     // fractional seconds
        "(Z|\\+[01][0-9]|\\+2[0-4]|-[01][0-9]|-2[0-4])?" +                  // timezone hours
        ":?([0-5][0-9]|60)?$"                                               // timezone minutes
    ),

    fromISOString: function( string ) {
        var t = this.matchISOString.exec( string );
        if( !t )
            return undefined;
        // log( inspect( t ) );

        var year = finiteInt( t[ 1 ], 10 );
        var month = finiteInt( t[ 2 ], 10 ) - 1;
        var day = finiteInt( t[ 3 ], 10 );
        var hours = finiteInt( t[ 4 ], 10 );
        var minutes = finiteInt( t[ 5 ], 10 );
        var seconds = finiteInt( t[ 6 ], 10 );
        var milliseconds = finiteInt( Math.round( parseFloat( t[ 7 ] ) * 1000 ) );
        var tzHours = finiteInt( t[ 8 ], 10 );
        var tzMinutes = finiteInt( t[ 9 ], 10 );

        var date = new this( 0 );
        if( defined( t[ 8 ] ) ) {
            date.setUTCFullYear( year, month, day );
            date.setUTCHours( hours, minutes, seconds, milliseconds );
            var offset = (tzHours * 60 + tzMinutes) * 60000;
            if( offset )
                date = new this( date - offset );
        } else {
            date.setFullYear( year, month, day );
            date.setHours( hours, minutes, seconds, milliseconds );
        }

        return date;
    }
} );


Date.prototype.extend( {
    getISOTimezoneOffset: function() {
        var offset = -this.getTimezoneOffset();
        var negative = false;
        if( offset < 0 ) {
            negative = true;
            offset *= -1;
        }
        var offsetHours = Math.floor( offset / 60 ).toString().pad( 2, "0" );
        var offsetMinutes = Math.floor( offset % 60 ).toString().pad( 2, "0" );
        return (negative ? "-" : "+") + offsetHours + ":" + offsetMinutes;
    },

    toISODateString: function() {
        var year = this.getFullYear();
        var month = (this.getMonth() + 1).toString().pad( 2, "0" );
        var day = this.getDate().toString().pad( 2, "0" );
        return year + "-" + month + "-" + day;
    },


    toUTCISODateString: function() {
        var year = this.getUTCFullYear();
        var month = (this.getUTCMonth() + 1).toString().pad( 2, "0" );
        var day = this.getUTCDate().toString().pad( 2, "0" );
        return year + "-" + month + "-" + day;
    },


    toISOTimeString: function() {
        var hours = this.getHours().toString().pad( 2, "0" );
        var minutes = this.getMinutes().toString().pad( 2, "0" );
        var seconds = this.getSeconds().toString().pad( 2, "0" );
        var milliseconds = this.getMilliseconds().toString().pad( 3, "0" );
        var timezone = this.getISOTimezoneOffset();
        return hours + ":" + minutes + ":" + seconds + "." + milliseconds + timezone;
    },


    toUTCISOTimeString: function() {
        var hours = this.getUTCHours().toString().pad( 2, "0" );
        var minutes = this.getUTCMinutes().toString().pad( 2, "0" );
        var seconds = this.getUTCSeconds().toString().pad( 2, "0" );
        var milliseconds = this.getUTCMilliseconds().toString().pad( 3, "0" );
        return hours + ":" + minutes + ":" + seconds + "." + milliseconds + "Z";
    },


    toISOString: function() {
        return this.toISODateString() + "T" + this.toISOTimeString();
    },


    toUTCISOString: function() {
        return this.toUTCISODateString() + "T" + this.toUTCISOTimeString();
    }
} );


/* event methods */

if( !defined( window.Event ) )
    Event = {};


Event.prep = function( event ) {
    event = event || window.event;
    if( !event.stop )
        event.stop = this.stop;
    if( !event.target )
        event.target = event.srcElement;
    return event;
}


Event.stop = function( event ) {
    event = event || this;
    if( event == Event )
        event = window.event;

    // w3c
    if( event.preventDefault )
        event.preventDefault();
    if( event.stopPropagation )
        event.stopPropagation();

    // ie
    try {
        event.cancelBubble = true;
        event.returnValue = false;
    } catch( e ) {}

    return false;
}


try { Event.prototype.stop = Event.stop; }
catch( e ) {}


/* ajax */

if( !defined( window.XMLHttpRequest ) ) {
    window.XMLHttpRequest = function() {
        var types = [
            "Microsoft.XMLHTTP",
            "MSXML2.XMLHTTP.5.0",
            "MSXML2.XMLHTTP.4.0",
            "MSXML2.XMLHTTP.3.0",
            "MSXML2.XMLHTTP"
        ];
        
        for( var i = 0; i < types.length; i++ ) {
            try {
                return new ActiveXObject( types[ i ] );
            } catch( e ) {}
        }
        
        return undefined;
    }
}