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The standard copy command is mostly used as an AppleScript command, although it can also operate as various application commands under some conditions.
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Using copy As an AppleScript Command
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Like the set command, AppleScript s copy command is commonly used to assign values to variables. Here is its syntax: copy some_expression to an_AppleScript_variable_or_reference There is one important difference between using set and copy, however. Although set always puts the original value you give it directly into the variable, when used with certain classes of AppleScript values, the copy command makes an identical copy of the original value and puts this in the variable instead. This duplicating behavior applies only to values that can have editable properties and elements: lists, records, dates, script objects, and AppleScript references created with the a reference to operator. Simpler values such as numbers and strings aren t affected. For example, the following: set variable_1 to "John" set variable_2 to variable_1 and the following: set variable_1 to "John" copy variable_1 to variable_2
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CHAPTER 7 GIVING COMMANDS
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do the same thing. The first line assigns a string value, "John", to variable_1. The second line assigns the value of variable_1 to variable_2. Both variables contain the same object. Similarly, if you use the set command with a list object, like this: set variable_1 to {"John", "Paul", "George", "Pete"} set variable_2 to variable_1 both variables contain the same object. You can check this by changing one of the items in the list as follows: set variable_1 to {"John", "Paul", "George", "Pete"} set variable_2 to variable_1 set last item of variable_2 to "Ringo" If you look at the value of variable_2, it s just what you d expect it to be: variable_2 --> {"John", "Paul", "George", "Ringo"} If you next check the value of variable_1, you ll find it s the same list object: variable_1 --> {"John", "Paul", "George", "Ringo"} This ability to put the same value into multiple variables can be useful in some situations, although it can also easily catch you out if you re not careful! For example, what if you wanted to keep your original list around so you could use it again later in a different part of the script Obviously, using set is no good for this. One solution is to make a perfect copy of the original list by using the copy command instead: set variable_1 to {"John", "Paul", "George", "Pete"} copy variable_1 to variable_2 Now each variable contains a different list object. At first, they still look identical: variable_1 --> {"John", "Paul", "George", "Pete"} variable_2 --> {"John", "Paul", "George", "Pete"} but you can now safely alter the contents of the second list without affecting the first one: set last item of variable_2 to "Ringo" variable_2 --> {"John", "Paul", "George", "Ringo"} --our new list variable_1 --> {"John", "Paul", "George", "Pete"} --our original list Lastly, like set, you can use copy to assign an application object or list of objects to an AppleScript variable. For example, the following: tell application "Finder" copy every folder of home to folder_list end tell is equivalent to the following: tell application "Finder" set folder_list to every folder of home end tell
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CHAPTER 7 GIVING COMMANDS
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In each case, you re getting a list of folder references from the Finder and assigning this to the variable folder_list.
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Using copy As an Application Command
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So far you ve seen how the standard copy command works when used with AppleScript values and variables. What happens when you start using it as an application command Here is the syntax: copy some_expression to an_application_reference Once again, the target is a reference to a property or element of an application object (or objects). However, the way this statement actually behaves varies according to how it s used. Most of the time, it behaves the same as an application s set command. For example, when you run the following script: tell application "Finder" copy "new name" to name of folder "old name" of desktop end tell AppleScript will look at the parameters to the copy command and then internally translate it to a standard set command before sending it to the Finder. It s equivalent to writing this: tell application "Finder" set name of folder "old name" of desktop to "new name" end tell How does it know to do this Well, AppleScript already knows that applications always use set to assign values to their properties. Since the copy command s direct parameter is a string and its to parameter is a property of an application object, it helpfully converts your original instruction to one that the application will understand. Similarly, the following: tell application "Finder" tell desktop copy label index of first folder to label index of every folder end tell end tell is equivalent to this: tell application "Finder" tell desktop set label index of every folder to label index of first folder end tell end tell The one exception is when both parameters are references to the elements of application objects (the to parameter must be a literal reference, though the direct parameter can be either a literal reference or an application reference stored in a variable). In this case, AppleScript will internally translate the copy command into a standard application duplicate command and send that to the application. Consider the following example: tell application "Finder" copy every file of desktop to folder "Archive" of home end tell The direct parameter is a literal reference to all the desktop object s file elements, and the to parameter is a literal reference to the home folder s Archive folder element. Once again, AppleScript helpfully converts your original instruction into one that the application will understand. Since
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