Download AppleScript: The Definitive Guide (Definitive Guides) PDF

TitleAppleScript: The Definitive Guide (Definitive Guides)
LanguageEnglish
File Size23.7 MB
Total Pages482
Document Text Contents
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Developer
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The Definitive Guide

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O'REILLY®

AppleScript: The Definitive Guide
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Page 241

if condition then
- - wh at to do if con dition is true

end if

It is also permitted to supply a second block, to be executed if the condition is false .
One or the other of the two blocks will be executed.

if condition then
- - wh at to do if con dition is true

else
- - wh at to do if con dition is false

end if

Another syntax lets you specify multiple conditions. Apple5cript will execute the first
block whose condition is true, skipping the others . It is permitted to supply a final
block that will be executed if none of the conditions is true.

if conditionl then
- - wh at to do if con dition l is true

else if condition2 then
- - wh at to do if con dition 2 is true

- - . . . s ame for condition3, condition4, etc.
[ else ]

- - wh at to do if none of them is true
end if

So, for example :

set x to random number from 1 to 10
set guess to text returned of �

(display dialog " Pick a number from 1 to 10" default answer " " )
try

set guess to guess a s number
on error

return
end try
if guess < 1 or guess > 10 then

display dialog "I said from 1 to 10 ! "
else if guess < x then

display dialog "Too small . I was thinking of " & x
else if guess > x then

display dialog "Too big . I was thinking of " & x
else

display dialog " J ust right . "
end if

There's also a single-line form :

if condition then whatToDo

In the single-line form, whatToDo is any valid expression or single-line command (it
can even be another single-line if) .

Branching I 219

Page 242

Looping
The other major form of choice is looping, which involves branching back to the start
of a block repeatedly. In AppleScript, looping is performed with repeat . There are
several varieties of repeat, but repeat blocks all take same basic form :

repeat whatKindOfRepeat
- - what to do
end repeat

The big question with a repeat block is how you're going to get out of it. Obviously
you don't want to repeat the repeat block forever, since this will be an infinite loop
and will cause the computer to hang. Usually you deal with this through the nature
of the whatKindOjRepeat, which typically provides a condition to be evaluated, as a
way of deciding whether to loop again, or some other form of instruction governing
how many times the block will be repeated.

There are also some special commands for hustling things along by leaping com­
pletely out of the repeat block. They can be used with any form of repeat block. Here
they are :

return

This command leaves the repeat block by virtue of the fact that i t terminates exe­
cution of the handler or script.

exit repeat

This command exits the innermost repeat block in which it occurs . Execution
resumes after the end repeat line .

Repeat Forever

A repeat block with no whatKindOjRepeat clause repeats unconditionally, whence for­
ever. Obviously you don't really want it to repeat forever, so it's up to you to supply
a way out . I just told you two ways out. A third is to loop inside a try block and to
throw an error; this method is illustrated later in this chapter, in "Catch. "

repeat
display dialog " Prepare to loop forever . "
exit repeat

end repeat
display dialog " J ust kidding . "

Repeat While
A repeat block where whatKindOjRepeat is the keyword while followed by a boolean
expression tests the expression before each repetition. If the expression is true, the
block is executed. If the expression is false, the block is not executed and that's the end
of the loop; execution resumes after the end repeat line. The idea is that in the course
of looping something will eventually happen that will make the expression false.

220 I Chapter 12 : Control

Page 481

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