wddx.js

嵌入式ＷＥＢ

///////////////////////////////////////////////////////////////////////////
//
//	Filename:		wddx.js
//
//	Authors:		Simeon Simeonov ([e-mail])
//				Nate Weiss ([e-mail])
//
//	Last Modified:		October 19, 1999
//
///////////////////////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////////////////////
//
//	WddxSerializer
//
///////////////////////////////////////////////////////////////////////////


///////////////////////////////////////////////////////////////////////////
// 	serializeValue() serializes any value that can be serialized
//	returns true/false
function wddxSerializer_serializeValue(obj)
{
	var bSuccess = true;
	var val;

	if (obj == null)
	{
		// Null value
		this.write("<null/>");
	}
	else if (typeof(val = obj.valueOf()) == "string")
	{
		// String value
		this.serializeString(val);
	}
	else if (typeof(val = obj.valueOf()) == "number")
	{
		// Distinguish between numbers and date-time values

		if (
			typeof(obj.getTimezoneOffset) == "function" &&
			typeof(obj.toGMTString) == "function")
		{
			// Possible Date
			// Note: getYear() fix is from David Flanagan's 
			// "JS: The Definitive Guide". This code is Y2K safe.
			this.write("<dateTime>" + 
				(obj.getYear() < 1000 ? 1900+obj.getYear() : obj.getYear()) + "-" + (obj.getMonth() + 1) + "-" + obj.getDate() +
				"T" + obj.getHours() + ":" + obj.getMinutes() + ":" + obj.getSeconds());
            if (this.useTimezoneInfo)
            {
            	this.write(this.timezoneString);
            }
            this.write("</dateTime>");
		}
		else
		{
			// Number value
			this.write("<number>" + val + "</number>");
		}
	}
	else if (typeof(val = obj.valueOf()) == "boolean")
	{
		// Boolean value
		this.write("<boolean value='" + val + "'/>");
	}
	else if (typeof(obj) == "object")
	{
		if (typeof(obj.wddxSerialize) == "function")
		{
			// Object knows how to serialize itself
			bSuccess = obj.wddxSerialize(this);
		}
		else if (
			typeof(obj.join) == "function" &&
			typeof(obj.reverse) == "function" &&
			typeof(obj.sort) == "function" &&
			typeof(obj.length) == "number")
		{
			// Possible Array
			this.write("<array length='" + obj.length + "'>");
			for (var i = 0; bSuccess && i < obj.length; ++i)
			{
				bSuccess = this.serializeValue(obj[i]);
			}
			this.write("</array>");
		}
		else
		{
			// Some generic object; treat it as a structure

			// Use the wddxSerializationType property as a guide as to its type			
			if (typeof(obj.wddxSerializationType) == 'string')
			{              
				this.write('<struct type="'+ obj.wddxSerializationType +'">')
			}  
			else
			{                                                       
				this.write("<struct>");
			}
						
			for (var prop in obj)
			{  
				if (prop != 'wddxSerializationType')
				{                          
				    bSuccess = this.serializeVariable(prop, obj[prop]);
					if (! bSuccess)
					{
						break;
					}
				}
			}
			
			this.write("</struct>");
		}
	}
	else
	{
		// Error: undefined values or functions
		bSuccess = false;
	}

	// Successful serialization
	return bSuccess;
}



///////////////////////////////////////////////////////////////////////////
// serializeAttr() serializes an attribute (such as a var tag) using JavaScript 
// functionality available in NS 3.0 and above
function wddxSerializer_serializeAttr(s)
{
	for (var i = 0; i < s.length; ++i)
    {
    	this.write(this.at[s.charAt(i)]);
    }
}


///////////////////////////////////////////////////////////////////////////
// serializeAttrOld() serializes a string using JavaScript functionality
// available in IE 3.0. We don't support special characters for IE3, so
// just throw the unencoded text and hope for the best
function wddxSerializer_serializeAttrOld(s)
{
	this.write(s);
}


///////////////////////////////////////////////////////////////////////////
// serializeString() serializes a string using JavaScript functionality
// available in NS 3.0 and above
function wddxSerializer_serializeString(s)
{
	this.write("<string>");
	for (var i = 0; i < s.length; ++i)
    {
    	this.write(this.et[s.charAt(i)]);
    }
	this.write("</string>");
}


///////////////////////////////////////////////////////////////////////////
// serializeStringOld() serializes a string using JavaScript functionality
// available in IE 3.0
function wddxSerializer_serializeStringOld(s)
{
	this.write("<string><![CDATA[");
	
	pos = s.indexOf("]]>");
	if (pos != -1)
	{
		startPos = 0;
		while (pos != -1)
		{
			this.write(s.substring(startPos, pos) + "]]>]]&gt;<![CDATA[");
			
			startPos = pos + 3;
			if (startPos < s.length)
			{
				pos = s.indexOf("]]>", startPos);
			}
			else
			{
				// Work around bug in indexOf()
				// "" will be returned instead of -1 if startPos > length
				pos = -1;
			}                               
		}
		this.write(s.substring(startPos, s.length));
	}
	else
	{
		this.write(s);
	}
			
	this.write("]]></string>");
}


///////////////////////////////////////////////////////////////////////////
// serializeVariable() serializes a property of a structure
// returns true/false
function wddxSerializer_serializeVariable(name, obj)
{
	var bSuccess = true;
	
	if (typeof(obj) != "function")
	{
		this.write("<var name='");
		this.preserveVarCase ? this.serializeAttr(name) : this.serializeAttr(name.toLowerCase());
		this.write("'>");

		bSuccess = this.serializeValue(obj);
		this.write("</var>");
	}

	return bSuccess;
}


///////////////////////////////////////////////////////////////////////////
// write() appends text to the wddxPacket buffer
function wddxSerializer_write(str)
{
	this.wddxPacket += str;
}


///////////////////////////////////////////////////////////////////////////
// serialize() creates a WDDX packet for a given object
// returns the packet on success or null on failure
function wddxSerializer_serialize(rootObj)
{
	this.wddxPacket = "";

	this.write("<wddxPacket version='1.0'><header/><data>");
	var bSuccess = this.serializeValue(rootObj);
	this.write("</data></wddxPacket>");

	if (bSuccess)
	{
		return this.wddxPacket;
	}
	else
	{	
		return null;
	}
}


///////////////////////////////////////////////////////////////////////////
// WddxSerializer() binds the function properties of the object
function WddxSerializer()
{
	// Compatibility section
	if (navigator.appVersion != "" && navigator.appVersion.indexOf("MSIE 3.") == -1)
	{
    	// Character encoding table
        
    	// Encoding table for strings (CDATA)   
        var et = new Array();

    	// Numbers to characters table and 
    	// characters to numbers table
        var n2c = new Array();
        var c2n = new Array();
    
		// Encoding table for attributes (i.e. var=str)
		var at = new Array();

        for (var i = 0; i < 256; ++i)
        {
        	// Build a character from octal code
        	var d1 = Math.floor(i/64);
        	var d2 = Math.floor((i%64)/8);
        	var d3 = i%8;
        	var c = eval("\"\\" + d1.toString(10) + d2.toString(10) + d3.toString(10) + "\"");
    
    		// Modify character-code conversion tables        
        	n2c[i] = c;
            c2n[c] = i; 
            
    		// Modify encoding table
    		if (i < 32 && i != 9 && i != 10 && i != 13)
            {
            	// Control characters that are not tabs, newlines, and carriage returns
                
            	// Create a two-character hex code representation
            	var hex = i.toString(16);
                if (hex.length == 1)
                {
                	hex = "0" + hex;
                }
                
    	    	et[n2c[i]] = "<char code='" + hex + "'/>";

				// strip control chars from inside attrs
				at[n2c[i]] = "";

            }
            else if (i < 128)
            {
            	// Low characters that are not special control characters
    	    	et[n2c[i]] = n2c[i];

				// attr table
				at[n2c[i]] = n2c[i];
            }
            else
            {
            	// High characters
    	    	et[n2c[i]] = "&#x" + i.toString(16) + ";";
				at[n2c[i]] = "&#x" + i.toString(16) + ";";
            }
        }    
    
    	// Special escapes for CDATA encoding
        et["<"] = "&lt;";
        et[">"] = "&gt;";
        et["&"] = "&amp;";

		// Special escapes for attr encoding
		at["<"] = "&lt;";
        at[">"] = "&gt;";
        at["&"] = "&amp;";
		at["'"] = "&apos;";
		at["\""] = "&quot;";
		        
    	// Store tables
        this.n2c = n2c;
        this.c2n = c2n;
        this.et = et;    
		this.at = at;
        
   		// The browser is not MSIE 3.x
		this.serializeString = wddxSerializer_serializeString;
		this.serializeAttr = wddxSerializer_serializeAttr;
	}
	else
	{
		// The browser is most likely MSIE 3.x, it is NS 2.0 compatible
		this.serializeString = wddxSerializer_serializeStringOld;
		this.serializeAttr = wddxSerializer_serializeAttrOld;
	}
    
	// Setup timezone information
    
    var tzOffset = (new Date()).getTimezoneOffset();

	// Invert timezone offset to convert local time to UTC time
    if (tzOffset >= 0)
    {
    	this.timezoneString = '-';
    }
    else
    {
    	this.timezoneString = '+';
    }
    this.timezoneString += Math.floor(Math.abs(tzOffset) / 60) + ":" + (Math.abs(tzOffset) % 60);
    
	// Common properties
	this.preserveVarCase = false;
    this.useTimezoneInfo = true;

    // Common functions
	this.serialize = wddxSerializer_serialize;
	this.serializeValue = wddxSerializer_serializeValue;
	this.serializeVariable = wddxSerializer_serializeVariable;
	this.write = wddxSerializer_write;
}


///////////////////////////////////////////////////////////////////////////
//
//	WddxRecordset
//
///////////////////////////////////////////////////////////////////////////