Inside Macintosh: AppleScript Language Guide / Part 3 - Appendixes

Appendix A - The Language at a Glance

Handlers

Handlers are collections of statements that are executed in response to commands or error messages. Table A-6 summarizes handler definitions
and subroutine calls.

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 ]
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 ]

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