Scriptcase global variables
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If not, it can use an error statement to resignal the error message it receives, modifying the message as needed to supply information specific to the script. In the on error branch of a try statement, a script may be able to recover gracefully from the error. For example, a script can prepare to handle anticipated errors by using a try statement. This allows scripts to supply their own messages for errors that occur within the script. An error message can include an error number, which is an integer that identifies the error an error expression, which is an expression, usually a text object, that describes the error and other information.Ī script can signal an error-which can then be handled by an error handler-with the error statement.
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An error message is a message that is supplied by an application, AppleScript, or macOS when an error occurs during the handling of a command. error Statementsĭuring script execution, errors can occur in the operating system (for example, when a specified file isn’t found), in an application (for example, when the script specifies an object that doesn’t exist), and in the script itself. Results and error messages from AppleScript commands, scripting additions, and expressions are not affected by the application responses attribute. When you use an ignoring application responses block, you forego this information. The following examples show how considering and ignoring statements for various attributes can change the value of text comparisons.Ī response to an application command indicates whether the command completed successfully, and also returns results and error messages, if there are any. Default Value: Case and numeric strings are ignored all others are considered. If this attribute is ignored, the text objects are compared as if spaces, tab characters, and return characters were not present for example "Brick house" would be considered equal to "Brickhouse". , ? : ! ' ") are present for example "What? they inquired." is equal to "what they inquired". If this attribute is ignored, text objects are compared as if no punctuation marks (such as. This can be useful in comparing version strings. For example, if this attribute is considered, "1.10.1" > "1.9.4" evaluates as true otherwise it evaluates as false. numeric stringsīy default, this attribute is ignored, and text strings are compared according to their character values. If this attribute is ignored, text objects are compared as if no hyphens are present for example "anti-war" is equal to "antiwar". If this attribute is ignored, text objects are compared as if no diacritical marks (such as ´, `, ˆ, ¨, and ˜) are present for example, "résumé" is equal to "resume". See also greater than, less than for a description of how AppleScript sorts letters, punctuation, and other symbols. See Special Considerations below for related information. If this attribute is ignored, uppercase letters are not distinguished from lowercase letters. Specify how AppleScript should treats attributes, such as case, in performing text comparisons. Those that specify whether AppleScript should consider or ignore responses from an application. Those that specify attributes to be considered or ignored in performing text comparisons. There are two kinds of considering and ignoring statements: The considering and ignoring statements cause AppleScript to consider or ignore specific characteristics as it executes groups of statements. The last line of a compound statement always starts with end, and can optionally include the word that begins the control statement (such as end tell). A compound statement is known as a statement block.Ĭompound statements begin with one or more reserved words, such as tell, that identify the type of control statement. Simple statements can be written on one line, while compound statements can contain other statements, including multiple clauses with nested and multi-line statements.
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For example, a control statement may cause AppleScript to skip or repeat certain statements. A control statement is a statement that determines when and how other statements are executed or how expressions are evaluated.
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This chapter describes AppleScript control statements. Next Previous Control Statements Reference