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Extra spaces and tabs will be cleaned up when you check syntax, so don t bother with them. Also, indentation will happen automatically. You can, for readability s sake, leave some blank lines here and there. AppleScript will leave those alone. To add text that you want the script to ignore, precede it with a double hyphen (--). Any text starting after the double hyphen, all the way to the end of the line, will compile as an inline comment. Adding comments is essential if you or someone else returns to some code written a couple of months ago and wants to figure out how the code works with the aim of adding functionality or fixing a bug. It is amazing how difficult it can be to decipher even your own scripts after a while, after you can no longer remember what the different parts of the script are supposed to do. Another reason to comment scripts is that when you re creating scripts that are part of a large system, these comments will be a part of your technical specifications. Clients take well to scripters who comment their scripts. You can comment out whole blocks of text as well. You do that by starting the block with (* and ending it with *). Here s an example: (* The following statements identify the files that are a part of the job handled by the script at the time. *) This type of comment is great for longer explanations you want to add to your scripts. Adding a sort of executive summary at the start of the script is a great way to explain what the code does and how it does it.
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The time you spend writing comments will pay for itself many times over when it comes time for you to change the code, especially if some time has passed since you first wrote it.
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CHAPTER 2 SCRIPTING FROM THE GROUND UP
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The Application Scripting Dictionary
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The application dictionary describes all the commands and object classes defined by an application. A dictionary is your first stop when discovering how to script a specific application. You can tell whether an application is scriptable or not just by checking to see whether it has a dictionary. You can view the dictionary for any scriptable application in Script Editor by choosing File Open Dictionary and then choosing an application from the application list. The dictionary of the selected application will be displayed in the dictionary window. Figure 2-12 shows the dictionary of the Finder.
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Figure 2-12. The Finder s dictionary as shown in Script Editor
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CHAPTER 2 SCRIPTING FROM THE GROUND UP
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You can open an application s dictionary in Script Editor in two other ways. You can drag the application s icon and drop it on the Script Editor application s icon. Alternatively, in the Library panel in Script Editor (Window Library), you can click the plus button in the Library window s toolbar to add the application to the list, then select the application in the list, and finally click the Dictionary button in the toolbar to display that application s dictionary.
As you can see in Figure 2-12, an application s dictionary is segmented into suites. The suites are organized in a logical way in order to help you find the information you need. In each suite you will find definitions of both classes and commands or sometimes just one or the other. Note that the classes and commands are organized in suites so that the scripter will have an easier time browsing them. The suites don t play any actual role in how scripting actually works.
Classes in the Dictionary
Each object type, or class, is listed in the dictionary under the most fitting suite or is sometimes spread over more than one suite. This listing includes specific details about that class. Besides the class s name and description, you will find two main types of information for every class. Elements are the first type of information. Under the Elements heading are the potential elements a class could have once it is an actual object in the application. For instance, among the elements of the Folder class are folder, file, alias file, clipping, and so on. Disks do not appear as elements of folders since a folder can never contain a disk. The other type of information listed for a given class is that class s properties. Properties can be read using the get command and can be changed using the set command. Not all properties can be set, however. Properties that are denoted with r/o are read-only and therefore can t be changed, only read.
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