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CHAPTER 2 JAVASCRIPT RECIPES
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Until the loop is started using the for keyword, variables are initialized. They are defined as follows: buffer: This variable is used to create the complete text that represents the serialized object. comma: This variable uses the technique outlined in Recipe 2-7 to determine whether a comma is needed when creating the JavaScript serialized object format. As a reference, each property declaration in a serialized object format (e.g., {prop1: true;,prop2:false}) is separated using a comma. The function implements a technique where the first time it is called, no comma is necessary, but for every call thereafter, a comma is necessary. Without using the technique in Recipe 2-7, a decision block and flag would be necessary. quoteProperties: This variable denotes whether the buffer contains a double quote. The quote is used when serializing the object to JSON format. canProcessFilter: This variable is a function callback that is called for each property value found. The callback returns either true to serialize the property or false to ignore the property. The callback has three parameters: property, the actual property reference; obj, the object being serialized; and propertyIdentifier, the string identifier of the property. functionPropertyCallback: This variable is a function callback that is called when iterating the properties of a function. The properties of the function cannot be stored in the buffer variable because the serialized format does not allow for the definition of function properties. The properties of a function need to be assigned after the definition of the serialized JavaScript object buffer. This is why the complete serialization of a JavaScript object requires a variable definition. callingStack: To assign a function property embedded within another JavaScript object declaration, you need the serialized object reference (e.g., variable.embeddedobj. function.value). To create the reference, a stack is used, where each element in the stack is an object reference. After the declarations, the properties of the object are iterated (for(property...) in a loop. Before explaining the details of the loop, I ll cover the missing callback initialization. Source: /website/ROOT/scripts/common.js if (callbacks) { if (callbacks.canProcessFilter) { canProcessFilter = callbacks.canProcessFilter; } if (callbacks.functionPropertyCallback) { functionPropertyCallback = callbacks.functionPropertyCallback; } if (callbacks.variablename) { callingStack.pop(); callingStack.push(callbacks.variablename); }
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CHAPTER 2 JAVASCRIPT RECIPES
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if (callbacks.quoteProperties) { if (callbacks.quoteProperties == true) { quoteProperties = "\""; } } } The caller of the serialization does not need to provide a value for callbacks. If no value is provided, a default serialization of everything is assumed, except the function properties. The function properties are not serialized because there is no way in the serialized JavaScript object format to associate a function property with the function. More of the code will be explained shortly. The serialization has four callback functions: canProcessFilter: Used to determine whether the property can be serialized. functionPropertyCallback: Called whenever a function property is serialized. variableName: Represents the variable identifier used when a serialization to a variable is generated. quoteProperties: Represents a value that when set to true generates quotes around the property identifier. This is typically used when generating a serialization format for JSON. Now that we ve looked at the initialization details, let s move on to examine the serialization logic. The loop is responsible for serializing the object instance, and the details of the loop have been abbreviated. At this stage, I ll explain the overall strategy. In JavaScript, each method and data member can be accessed on an object using the following notation: obj.datamember = ... This notation is the most common way of accessing a method or data member when writing source code. For serialization purposes, the notation is not useful because the programmer is expected to know what the individual methods and data members are. For serialization purposes, reflection is needed. Reflection in JavaScript is a two-step process: 1. The string value property identifiers are available using an enumeration and iterated using a loop (e.g., for(property in obj)). 2. The actual property is accessed using an array notation, where the array is the object instance and the index is the string value property identifier (e.g., obj[property]). As each property is iterated, the serialization first queries if the property should be serialized by calling the canProcessFilter callback function. If the property can be serialized, then a switch statement is called that tests the type of the property. The typeof function returns six different identifiers, of which five are of interest (we are not interested in undefined, as undefined should not be serialized). The details of the switch statement are as follows.
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