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Ax51 User's Guide
Ax51 Introduction Assembling Programs Writing Assembly Programs Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting a Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes C Preprocessor Exceptions Side-Effects Predefined Macros Examples Error Messages AppendixWHILE Function
The WHILE MPL function repeats a block until a specified condition is TRUE. The syntax for the WHILE function is:
%WHILE (expression) (balanced-text)
The WHILE function first evaluates the expression. If it is TRUE the balanced-text is expanded and the expression is reevaluated. If it is TRUE the balanced-text is expanded again and so on. This loop repeats until the expression is FALSE.
The balanced-text must modify the expression or the WHILE function never terminates. Additionally, the balanced-text may call the EXIT MPL function to terminate the WHILE function.
Source Text
%SET (count, 5) %'initialize count to 5' %WHILE (%count GT 0) ( ADD R5,R5 %SET (count, %count - 1) )
Output Text
ADD R5,R5 ADD R5,R5 ADD R5,R5 ADD R5,R5 ADD R5,R5
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