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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 AppendixComment Function
The Comment MPL function allows you to add comments to your macro definitions. MPL is subtle which makes the operation of some macros unobvious. Therefore, it is good programming practice to add comments to your macro definitions. Comment functions always expand to a null string. The syntax of the comment function is:
%'text' %'text <EOL>
Two terminating characters are recognized for comments: the apostrophe and the end-of-line character (<EOL>). When a comment is terminated with the <EOL>, all text in the comment including the <EOL> is replaced with a null string. This allows you to create several lines of comments without including <EOL> characters in the expanded output.
No matter which form of the comment function you use, comment text is not evaluated for macro calls.
Source Text
MOV R5, R15 %'the following line will be kept separate' MOV R1, %'this comment eats the newline character R12 %' This is a Multi-Line comment. %' This is another line. %' And, this is a third line.
Output Text
MOV R5, R15 MOV R1, R12
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