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Every command has a name. When an object receives a command, it checks to see whether it contains a command handler of the same name. If it does, it responds to the command by executing the code in that handler. If not . . . well, we ll discuss what happens then later in the chapter (see the Types of Commands section). A command name may be a keyword defined by a scriptable application, scripting addition, or AppleScript itself, or it may be an AppleScript identifier if it s a user-defined command. Here are some examples: run, make, set, display dialog, and find_and_replace.
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To have an effect, a command must be sent to an object that knows how to handle it. This is often an application object representing the program you want to script. For example: application "Finder" You can also specify applications by their full path, which is useful if you have several applications with the same name and need to specify one of them in particular: application "Macintosh HD:Applications:AppleScript:Script Editor.app:" You can use AppleScript values such as lists and strings as the target for AppleScript s own count command. For example: count "The quick brown fox jumps over the lazy dog." each word
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CHAPTER 7 GIVING COMMANDS
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The target can also be a script object, usually your main script. (More advanced scripters may want to target other script objects as well; 19 explains how and why.) If you do not specify a particular target for a command, it will be targeted at the current script. Scripting addition commands and user-defined commands are usually sent to the current script, although they can also be sent to other applications if needed. The following example sends a beep command to the current script: beep I ll discuss just what happens to commands when they arrive at the current script a bit later in the chapter (see the More About Targets section). To make targeting commands easier, AppleScript provides the tell block statement, which you already met in 2. You can use a tell block to specify the default target for all the commands inside the block, which can be especially convenient when you want to direct several commands to the same location. In the following script, the target for the sleep command is the System Events application: tell application "System Events" sleep end tell Here, the commands activate, enable_logging, and start_next_job are being sent to an application named Job Manager: tell application "Job Manager" activate enable_logging() start_next_job() end tell
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Many command handlers need additional data in order to do their jobs. The command itself must supply these values we call these values parameters. For example, the following open command has a single parameter, an alias value identifying the file you want to open in TextEdit: tell application "TextEdit" open alias "Macintosh HD:Users:hanaan:Notes.txt" end tell Here s another example, taken from a larger script: set the_list to {"John", "Pete", "Jan", "Mary", "Frank"} set value_to_find to "Mary" find_position_in_list(the_list, value_to_find) Here the command find_position_in_list contains two values: a list and a string. As you can see, this command is being targeted at the script itself. In the completed script, a command handler of the same name would take these two values and perform some operations on them in this case, finding the position of the value Mary in the given list. You may notice that the find_position_in_list command is written a bit differently than the open command. That s because find_position_in_list is a user-defined command whereas open is defined by an application. Although it may seem a bit odd and inconsistent that one command can have one syntax while another command follows another, this is just one of those quirks that makes AppleScript AppleScript. I ll discuss these differences and how they affect you throughout this chapter.
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