This glossary provides definitions of terms used in the ARexx manual.
- An identifying number assigned to every byte of information in a computer's memory and every sector on a disk.
- An additional piece of information included with an instruction or function. The argument determines the action to be taken.
- assignment clause
- A variable symbol (simple, stem or compound symbol) followed by an = operator. In an assignment clause, the tokens to the right of the = sign are evaluated and the result is assigned to the variable symbol.
- Having two possible states: 0 (false) or 1 (true).
- The smallest executable language unit.
- clip list
- A clipboard used for intertask communication. Name and value pairs can be added to the clip list with the SETCLIP() function.
- command clause
- An ARexx expression in which the result is issued as a command to an external application.
- command interface
- A message port through which ARexx issues commands to compatible applications.
- A group of characters enclosed in /*...*/ symbols. Each ARexx program starts with a comment.
- compound symbol
- A token made up of alphanumeric or ., !, ?, $, _ characters with one or more periods within the name. Compound symbols have the structure stem.n1.n2...nk.
- The process of linking together two strings.
- Finding and fixing errors in a program.
- A character that marks the beginning and end of a string. ARexx delimiters are a single quote (') and a double quote (").
- A group of tokens to be evaluated. Expressions are made up of strings, symbols, operators, and parentheses.
- fixed symbol
- A token beginning with a digit or a period.
- A group of statements that can be executed as a whole. Functions allow you to build complex programs from smaller modules.
- function hosts
- An external application that contains an ARexx port. The name of a function host is the name of the program's public message port.
- function libraries
- A collection of one or more functions organized as an Amiga shared library. A function library must contain a library name, a search priority, an entry point offset, and a version number.
- global environment
- The fixed components of an ARexx program, including the program source code, static data strings and argument strings.
- host address
- In an outside application, the host address is the name of the message port to which ARexx commands can be sent.
- A clause beginning with a certain keyword that tells ARexx to perform an action.
- interprocess communication
- The exchange of information between applications.
- Internal flags in ARexx that allow a program to detect errors and retain control when the program would normally abort. Interrupts are controlled by the SIGNAL: instruction.
- Repeating a section of a program.
- A symbol token followed by a colon (:). Labels identify a particular location in the program.
- library list
- An internal list, maintained by ARexx, of all the currently available function libraries and function hosts. Applications can add or remove functions as needed.
- Another name for an ARexx program.
- A token that determines the beginning and end of a parse string.
- message port
- An interface in an Amiga application that allows the program to communicate with an ARexx program.
- null clause
- A blank line or a comment line.
- numeric precision
- The number of decimal places in an arithmetic result. As the number of decimal places decreases, the result becomes less precise.
- A character such as (+), (-), or (|) used in an arithmetic, concatenation, comparison, or logical operation.
- Breaking a string into smaller units.
- return code
- The severity level of an error. This number (5, 10, or 20) is displayed when an error occurs in an ARexx program.
- The program that acts as an interpreter for ARexx programs.
- simple symbol
- A token that does not begin with a digit or contain any periods.
- An assignment, instruction, or command clause.
- stem symbol
- A token that has one period at the end of its name. Stem symbols are used to initialize compound symbols.
- storage environment
- The variable components of an ARexx program, including the symbol table, numeric options, trace options and host address strings.
- A group of characters beginning and ending with a delimiter (single or double quote). The value of a string is the string itself.
- Any group of the alphanumeric characters a-z, A-Z, 0-9, period (.), exclamation point (!), question mark (?), dollar sign ($), or underscore (_).
- symbol table
- An internal table created by ARexx that stores the value strings that have been assigned to the variables in a program.
- A symbol, usually a variable symbol, that is assigned a value during a parsing operation.
- A group of tokens that specifies the variables used in a parsing operation. It also specifies the way in which the values will be determined.
- The process of breaking a statement into its individual tokens.
- The smallest entities of the ARexx language.
- Displaying the lines of an ARexx program as the program is executing. This allows you to determine exactly where any errors are occurring.
- A symbol that can be assigned a value.