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Much like the = and operators, the greater than and less than operators always return a result as a Boolean. This means the result of using an operator can be either true or false. To use these operators, you need to understand how a certain character is considered to be greater than another. In MacRoman text, one character is considered less than or greater than another character depending on whether the first character appears before or after the second one in the MacRoman character table (though don t forget that text comparisons may also be affected by ignoring clauses, of course). Refer to Table 3-1 for the order of characters in the MacRoman table. To determine in a script whether one string comes before another string, use the less than operator, which can be written in any of several ways: "a" comes before "b" "a" < "b" "a" is less than "b" Similarly, the greater than operator checks whether the first parameter is greater than the second or appears later in the sorting chain: "a" comes after "b" "a" > "b" "a" is greater than "b" Use the greater than or equal operator to see whether one value is either the same as or greater than another: "a" "b" You can also write this as follows: "a" is greater than or equal to "b" And you can use the less than or equal operator to see whether one value is the same as or less than the other: "a" "b" "a" is less than or equal to "b"

In the spirit of putting characters in order, let s try to analyze a script that sorts a list of strings. First, Script 3-3 shows the script. Note that this script snippet is a prime candidate for a subroutine. The parameter will be the list you want to sort, and the returned result will be the sorted list. For now, though, you will just concentrate on the code itself and not on how it may fit in a script. (I should also note that I did not write this script. This subroutine is a standard beginner sorting example that has been around for decades.) Script 3-3. set theList to {"Dell", "Apple", "HP"} repeat (length of theList) times repeat with j from 1 to (length of theList) 1 if item j of theList > item (j + 1) of theList then set {item j of theList, item (j + 1) of theList} to {item (j + 1) of theList, item j of theList}

Another method of adding functionality to AppleScript is by using faceless background applications. These invisible applications play a similar role to scripting additions, providing additional commands for AppleScripts to use. The main difference is that scripting additions are chunks of code that are loaded into existing programs; faceless scriptable applications are applications with their own scripting dictionary. In the following sections, you will explore three such faceless applications. All three are not only free but come preinstalled with every Mac, so you don t run a risk that someone won t have them installed.

Summary

Although this little application has only two scriptable commands, it can be quite useful. It allows you to use AppleScript to upload and download files to and from the Internet.

If you use ColorSync on a regular basis, you may want to take a good look at this little utility, which provides commands for adding, removing, and examining the ColorSync profiles attached to image files and converting images from one color space to another. In the /Library/Scripts/ColorSync folder, you will find 18 scripts that use ColorSync scripting. I urge you to open them and figure out how they work (it is a bit beyond the scope of the book).

In this chapter, you have built application modules to implement business use cases using instances of the view objects you created earlier, and you have learned that: An application module represents a specific use case. The application module comprises instances of view objects. The application module defines the boundary of the database transaction.