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You can use the error command to throw errors at any point during the script, like this: error "Something happened" number 999 Although I used only the error text and number components, you can use the other two as well. Be aware that Apple reserves negative error numbers.
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CHAPTER
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Defining and Calling Subroutines
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lthough subroutines aren t the first thing you create when you learn AppleScript, they are the one facet of writing scripts that will have the most impact on your scripts, especially as they grow bigger and more ambitious. Subroutines are your tools for organizing scripts; they make your scripts efficient and give you a perfect way to store and reuse your code.
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What Are Subroutines
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Subroutines allow you to create your own commands. A command is simply an isolated block of code that does something, defined by AppleScript, a scripting addition, or a scriptable application. This code is executed from somewhere else in the system and can be reused over and over again, wherever you need that functionality to occur. A command you use in AppleScript can trigger a few or many lines of code, depending on its complexity. Your subroutines aren t much different; it s just that subroutines are commands written using AppleScript, which means you can easily write them and use them yourself. Rather than being part of the main body of the script, subroutines are organized away from it and are called, or triggered, from the main body of the script or from other subroutines.
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Subroutines are often referred to as handlers and sometimes as functions and procedures. All these, for this book s purposes, have the same meaning.
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To better understand subroutines, I want you to imagine making a list of tasks before throwing a party in your house. The list may include baking a cake, washing dishes, buying chips, and sending invitations. Although this list is a great overview, it doesn t offer any details. If the list actually included all the details of baking a cake or looping through dishes in the sink and washing each one, the list would no longer be a snapshot that you could glance at to see what needed to be done. For items that do require directions, such as the exact steps for baking the cake, which you ll most likely need, you know where to go. So when the day of the party finally arrives, you pick your list and look for the directions. Each item on the list, instead of being the specific instructions for the task, calls your attention to the task, whose specific details you can look up somewhere else. The same happens with a script that uses subroutines. The script in Figure 18-1 shows the party plan in the Script Editor the way you would organize it as a script with subroutines. By looking at the script in Figure 18-1, you can easily differentiate between the master plan and the fine details.
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CHAPTER 18 DEFINING AND CALLING SUBROUTINES
Figure 18-1. The party plan as a script Later, as you gain experience, you can start spreading commonly used subroutines into different script files called script libraries. Doing so makes your scripts smaller and more manageable and allows you to package general-purpose subroutines for use by multiple scripts. These libraries may have subroutines that all perform related tasks. In the preceding example, you could have a baker script library. In this case, you would use this line to bake the cake: tell baker to bake_cake("chocolate cake").
Subroutines Have to Be Called in Order to Work
On their own, subroutines don t do anything other than occupy bytes in your script file. A subroutine is used only when it is called from an active part of your script. That active part may start at the run handler (see the section Using the run handler later in this chapter) and continue through any subroutine that is called. Subroutines may call each other as well, which means one subroutine can contain a call to another subroutine. Imagine a job site without a foreman. You have a carpenter, electrician, landscaper plumber, and framer, but you don t have anyone to take charge and say, OK, we start by digging a big hole . . . . This foreman will assign tasks to the other workers. Each worker may then, based on their function, assign tasks to other people on the site. As soon as the workers have completed all the tasks the foreman had in the list, the job is considered done, and the workers can all go and have a drink (no matter what time of day it is . . .).
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