New PDF release: An Implementation Guide to Compiler Writing

By Jean-Paul Tremblay

ISBN-10: 0070651663

ISBN-13: 9780070651661

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Extra info for An Implementation Guide to Compiler Writing

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The expressionSeries portion of the method definition is the part of the code that actually performs some operation when the method is invoked. Let's take a look at a typical SmalltalkIV method to see how the various pieces (with the exception of the primitive) look and behave. Open a CHB if one is not already opened and choose the class Magnitude. If the name is followed by three dots (indicating it has hidden subclasses), double-click on it to open the list of subclasses. Now choose the subclass called Integer.

The result should look something like Figure 3-3 after you have entered a few answers and pressed the Enter key when you've finished your entries. Note that SmalltalklV indeed returns a set. You might want to enter a duplicate value just to verify that a set performs as advertised. ~ Sorting the User's List Since we will have more than one item in the list of objects to be sorted, we know that there's a good chance we will be dealing with one of the subclasses of the class Collection. A perusal of the Class Library diagram reveals the existence of a class called Sorted Collection that at least sounds like it should do what we want.

Chapter 3 The First Project: A Prioritizer ~ 43 Changing the Prompter We used an instance of the class Prompter to create both of the user interaction components of our prioritizer. The problem is that a prompter can only do one thing: pose a question and let the user type in an answer (or accept a supplied default response). We'd like to allow the user to click on the words "Yes" and "No" as the means of providing information about a given choice that we've placed into the Prioritizer. Although prompters only allow the user to type a response, there is a user interface component on which the user is accustomed to clicking to provide a response to the system.

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An Implementation Guide to Compiler Writing by Jean-Paul Tremblay


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