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AP P E N D I X   A
The Language at a Glance
Operators
371
5/5/99  ã Apple Computer, Inc.
Table A-8 shows the order in which AppleScript performs operations. The 
column labeled “Associativity” indicates the order in which AppleScript 
performs operations if there are two or more operations of the same precedence 
in an expression. The word “none” in the Associativity column indicates that 
you cannot have multiple consecutive occurrences of the operation in an 
expression. For example, the expression 
3 = 3 = 3
is not legal because the 
associativity for the equal operator (=) is “none.” The word “unary” indicates 
that the operator is a unary operator. To evaluate expressions with multiple 
unary operators of the same order, AppleScript applies the operator closest to 
³
>=
does not come before
doesn't come before
greater than or equal [to]
is greater than or equal [to]
is not less than
isn't less than
date
³
date
integer
³
integer
real
³
real
string
³
string
Miscellaneous operators
& (concatenation)
expression
expression
as
expression
as 
className
a reference to
[a] ( ref [to] | reference to ) 
Ø
reference
Table A-7
Operators  (continued)
Operator
Syntax
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AP P E N D I X   A  
The Language at a Glance
372
Operators
5/5/99  ã Apple Computer, Inc.
the operand first, then applies the next closest operator, and so on. For example, 
the expression 
not not not true
is evaluated as 
not (not (not true)).
Table A-8
Operator precedence 
Order
Operators
Associativity
Type of operator
1
( )
Innermost to 
outermost
Grouping
2
Unary
Plus or minus sign for numbers
3
^
Right to left
Exponentiation
4
*
/
÷
div
mod
Left to right
Multiplication and division
5
+
-
Left to right
Addition and subtraction
6
&
Left to right
Concatenation
7
as
Left to right
Coercion
8
<
£
>
³
None
Comparison
9
=
¹
None
Equality and inequality
10
not
Unary
Logical negation
11
and
Left to right
Logical for Boolean values
12
or
Left to right
Logical for Boolean values
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AP P E N D I X   A
The Language at a Glance
Control Statements
373
5/5/99  ã Apple Computer, Inc.
Control Statements
A
Control statements are described in detail in “Control Statements” (page 237).
Control statements are statements that control when and how other statements 
are executed. Table A-9 summarizes the control statements in the AppleScript 
English dialect. For more information about control statements, see Chapter 7, 
“Control Statements.”  
Table A-9
Control statements 
Control 
statement
Syntax
tell
tell 
referenceToObject
to 
statement
tell 
referenceToObject
statement
]...
end [ tell ]
if
if 
Boolean
then 
statement
if 
Boolean
[ then ] 
statement
]...
[ else if 
Boolean
[ then ]
statement
]...]...
[ else
statement
]...]
end [ if ]
repeat
repeat
statement
]...
end [ repeat ]
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AP P E N D I X   A  
The Language at a Glance
374
Control Statements
5/5/99  ã Apple Computer, Inc.
repeat 
integer
[ times ]
statement
]...
end [ repeat ]
repeat while 
Boolean
statement
]...
end [ repeat ]
repeat until 
Boolean
statement
]...
end [ repeat ]
repeat with 
variable
from 
integer
to 
integer
[ by 
integer
]
statement
]...
end [ repeat ]
repeat with 
variable
in 
list
statement
]...
end [ repeat ]
exit
exit
Table A-9
Control statements (continued)
Control 
statement
Syntax
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AP P E N D I X   A
The Language at a Glance
Control Statements
375
5/5/99  ã Apple Computer, Inc.
try
try
statement
]...
on error¬
errorMessageVariable
[ number 
errorNumberVariable
[ from 
offendingObjectVariable
[ partial result 
resultListVariable
[ to 
expectedTypeVariable
]
[ global 
variable
[, 
variable
]...]
[ local 
variable
[, 
variable
]...]
statement
]...
end [ error | try ]
considering
considering 
attribute
[, 
attribute
... and 
attribute
Ø
[ but ignoring 
attribute
[,
attribute
... and 
attribute
] ]
statement
]...
end considering
ignoring
ignoring 
attribute
[, 
attribute
... and 
attribute
Ø
[ but considering 
attribute
[, 
attribute
... and 
attribute
] ]
statement
]...
end ignoring
with timeout
with timeout [ of ] 
integer
second[s]
statement
]...
end [ timeout ]
with 
transaction
with transaction [ 
session
statement
]...
end [ transaction ]
Table A-9
Control statements (continued)
Control 
statement
Syntax
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AP P E N D I X   A  
The Language at a Glance
376
Handlers
5/5/99  ã Apple Computer, Inc.
Handlers
A
Handlers are collections of statements that are executed in response to 
commands or error messages. Table A-10 summarizes handler definitions and 
subroutine calls. Handlers are described in detail in “Handlers” (page 279).
Table A-10
Handler definitions and calls 
Handler
Syntax
Subroutine 
definition 
(labeled 
parameters)
( on | to ) 
subroutineName
¬
[ of | in 
directParameterVariable
subroutineParamLabel
paramVariable
] ...¬
[ given 
label
:
paramVariable
[, label:
paramVariable
]...]
[ global 
variable
[, 
variable
]...]
[ local 
variable
[, 
variable
]...]
statement
]...
end [ 
subroutineName
]
Subroutine call 
(labeled 
parameters)
subroutineName
¬
[ ( of | in ) 
directParameter
subroutineParamLabel
parameterValue
| [ with 
labelForTrueParam
[, 
labelForTrueParam
]...¬
[( and | or | , ) 
labelForTrueParam
] ]¬
| [ without 
labelForFalseParam
[, 
labelForFalseParam
]...¬
[( and | or | , ) 
labelForFalseParam
] ]¬
| [ given 
label
:
parameterValue
¬
[, 
label
:
parameterValue
]...]
...
Subroutine 
definition 
(positional 
parameters)
( on | to ) 
subroutineName
( [ 
paramVariable
[, 
paramVariable
]...] )
[ global 
variable
[, 
variable
]...]
[ local 
variable
[, 
variable
]...]
statement
]...
end [ 
subroutineName
]
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AP P E N D I X   A
The Language at a Glance
Handlers
377
5/5/99  ã Apple Computer, Inc.
Subroutine call 
(positional 
parameters)
subroutineName
( [ 
parameterValue
[, 
parameterValue
]...] )
Return 
statement
return 
expression
Command 
handler 
definition
( on | to ) 
commandName
¬
[ [ of ] 
directParameterVariable
[ [ given ] 
label
:
paramVariable
[, 
label
:
paramVariable
]...]
[ global 
variable
[, 
variable
]...]
[ local 
variable
[, 
variable
]...]
statement
]...
end [ 
commandName
]
Table A-10
Handler definitions and calls (continued)
Handler
Syntax
AP P E N D I X   A  
The Language at a Glance
378
Script Objects
5/5/99  ã Apple Computer, Inc.
Script Objects
A
Script objects are user-defined objects. Table A-11 summarizes the syntax for 
defining script objects in AppleScript. For more information about script 
objects, see Chapter 9, “Script Objects.”
Variable and Property Assignments and Declarations
A
Table A-12 summarizes the syntax for assigning values to variables and script 
properties and declaring local and global variables. For information about 
variables and script properties, see Chapter 3, “Values and Constants.” For 
Table A-11
Script objects
Script object element
Syntax
Script object 
definition
script [
scriptObjectVariable
]
[(property | prop) 
propertyLabel
expression
]...
handlerDefinition
]...
statement
]...
end [ script ]
Continue statement 
(to pass a command 
to a handler in the 
parent script object)
continue 
commandStatement
AP P E N D I X   A
The Language at a Glance
Variable and Property Assignments and Declarations
379
5/5/99  ã Apple Computer, Inc.
detailed information about the scope of script variables and properties, see 
“Scope of Script Variables and Properties” (page 311). 
The Text Item Delimiters property, which is the only property you can get and 
set using the global variable 
AppleScript
, consists of a list of the delimiters used 
by AppleScript when coercing lists to strings and when getting text items from 
strings. This property is declared by AppleScript and is available from any 
script. You can get and set this property with statements such as the following:
set savedDelimiters to AppleScript's text item delimiters
set AppleScript's text item delimiters to {":"}
get last text item of "Hard Disk:CD Contents:Release Notes"
--result: "Release Notes"
set AppleScript's text item delimiters to savedDelimiters
Currently, only the first delimiter in the list is used by AppleScript. For more 
information, see “AppleScript Properties” (page 210).
Table A-12
Assignments and declarations 
Assignment or declaration
Syntax
Variable assignment 
(and declaration if variable 
has not previously been 
declared)
copy 
expression
to 
variable
copy 
reference
to 
variable
set 
variable
to 
expression
set 
variable
to 
reference
Global variable declaration
global 
variable 
[, 
variable
]...
Local variable declaration
local 
variable
[, 
variable
]...
Script property declaration 
and assignment
property 
propertyLabel
expression
prop 
propertyLabel
expression
AP P E N D I X   A  
The Language at a Glance
380
Placeholders
5/5/99  ã Apple Computer, Inc.
Placeholders
A
Table A-13 explains the placeholders used in the syntax descriptions in this 
book.
Table A-13
Placeholders used in syntax descriptions 
Placeholder
Explanation
applicationName
A string containing the name of the application as it would be listed 
in the Application menu, or a string of the form 
"
Disk
:
Folder1
:
Folder2
:...:
ApplicationName
"
that specifies where the 
application is stored. For more information, see “References to 
Applications” (page 194).
attribute
An attribute, identified by a constant, that can be considered or 
ignored in a Considering or Ignoring control statement. The 
constants for attributes are 
case
white space
diacriticals
hyphens
expansion
punctuation
, and 
application responses
.
Boolean
An expression that evaluates to 
true
or 
false
. Boolean is an 
AppleScript value class. For more information, see “Boolean” 
(page 58).
className
A class identifier or an expression that evaluates to an object class 
identifier. 
commandName
An identifier (name) for a command.
commandStatement
A statement, consisting of a command with either parameter values 
or formal parameters, to be passed to a parent script object.
compositeValue
A value that contains other values. AppleScript has three types of 
composite values: lists, records, and strings.
containerReference
A reference that specifies a container for another object.
dataValue
An expression that evaluates to a value of the appropriate class for 
the object being created.
date
An expression that evaluates to a date. Date is an AppleScript value 
class. For more information, see “Date” (page 62).
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