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When Are Explicit gets Necessary
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Although AppleScript is good at working out the right time to send an implicit get command, it doesn t always get it 100% right when dealing with literal references. As a result, sometimes you need to help AppleScript out a bit by adding them yourself. First you ll look at how AppleScript decides when to send an implicit get when evaluating a literal reference. Consider the following example:
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CHAPTER 7 GIVING COMMANDS
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tell application "Finder" set the_name to name of home end tell --> "hanaan" This code actually involves two commands: An implicit application command, get, to get the value identified by the literal, reference name of home [of application "Finder"] An explicit AppleScript command, set, to assign the result of the right-side expression to the variable the_name AppleScript looks at the expression on the right side of the set command, sees that it s all a single reference, and sees that the start of the reference identifies an application property, home. So, it bundles the entire reference, sticks it in an implicit get command, and sends it off to the Finder. The Finder responds by evaluating the reference and returning the value it identifies, in this case a string value containing the name of the current user s Home folder. Lastly, the AppleScript set command assigns this string to the variable the_name. Whew! So far, so good. As I ve said, AppleScript is pretty good at guessing the right thing to do. Now let s look at what happens when it gets it wrong. Let s say that instead of the full folder name, I want only the first three characters of it han instead of hanaan in this case. Here s the code I originally wrote to do this: tell application "Finder" set abbreviated_name to text 1 thru 3 of name of home end tell When I try to run this script, however, instead of getting han, I get an error: Finder got an error: Can t get text 1 thru 3 of name of home. I know the folder name is at least three characters long, so the problem isn t that I asked for text that was out of range. Something else must have gone wrong, but what Well, remember how AppleScript performed its implicit get command in the earlier example It saw a literal reference that must be intended for the Finder, name of home, so it slurped up the entire reference and sent it off as the direct parameter to a Finder get command. In this example, it s using the same approach, only this time the reference it s sending to the Finder is text 1 thru 3 of name of home. If you look at the Finder s dictionary, you ll see that the name property defined in the item class (which is where the folder class gets it from) contains a string value (Unicode text, to be precise). Here is the part of the Finder s dictionary you re interested in, the definition for the item class: Class item: An item Plural form: items Properties: name Unicode text ...
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-- the name of the item
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You already know that AppleScript knows how to get text 1 thru 3 of an AppleScript string . . . and there s the problem: AppleScript may know how to do it, but right now you re not talking to AppleScript; you re talking to the Finder. And the Finder, like all scriptable applications, knows how to manipulate only the contents of application objects. In other words, the Finder knows how to resolve the name of home part OK, since the home property contains a folder object and the folder object contains a name property all things the Finder understands. However, its dictionary clearly states that the content of the name property is a simple string value, not an application object, and the Finder doesn t know how to manipulate the contents of values such as strings, lists, and records: its object model just doesn t stretch that far.
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