Lexical Elements of the DEC Text Processing Utility Language 4.8 Expressions

A true value in DECTPU is any odd integer; a false value is any even integer. Use the logical operators (AND, NOT, OR, XOR) to combine one or more expressions. DECTPU evaluates Boolean expressions enclosed in parentheses before other elements. The following example shows the use of parentheses to ensure that the Boolean expression is evaluated correctly:

IF (X = 12) AND (y <> 40)

THEN

.

.

.

ENDIF;

4.9 Reserved Words

Reserved words are words that are defined by DECTPU and that have a special meaning for the compiler.

DECTPU reserved words can be divided into the following categories:

•Keywords

•Built-in procedure names

•Predefined constants

•Declarations and statements

The following sections describe the categories of reserved words.

4.9.1 Keywords

Keywords are a DECTPU data type. They are reserved words that have special meaning to the compiler. You can redefine DECTPU keywords only in local declarations (local constants, local variables, and parameters in a parameter list). If you give a local constant, local variable, or parameter the same name as that of a keyword, the compiler issues a message notifying you that the local declaration or parameter temporarily supersedes the keyword. In such a circumstance, the keyword is said to be occluded. See Chapter 3 and the DEC Text Processing Utility Reference Manual for more information on keywords.

4.9.2 Built-In Procedure Names

The DECTPU language has many built-in procedures that perform functions such as screen management, key definition, text manipulation, and program execution. You can redefine DECTPU built-in procedures only in local declarations (local constants, local variables, and parameters in a parameter list). If you give a local constant, local variable, or parameter the same name as that of a built-in procedure, the compiler issues a message notifying you that the local declaration or parameter temporarily supersedes the built-in. In such a circumstance, the built-in is said to be occluded. See the DEC Text Processing Utility Reference Manual for a complete description of the DECTPU built-in procedures.

4.9.3 Predefined Constants

The following is a list of predefined global constants that DECTPU sets up. You cannot redefine these constants.

•FALSE

•TPU$K_ALT_MODIFIED

•TPU$K_CTRL_MODIFIED

4–12Lexical Elements of the DEC Text Processing Utility Language

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Compaq AA-PWCBD-TE manual Reserved Words, Keywords, Built-In Procedure Names, Predefined Constants
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