“Youtalkin’ to me? Youtalkin’ to me? Youtalkin’ to me?”says Travis Bickle in the
film Taxi Driver.
The macro processor is the Travis Bickle of SAS. To understand why, look at how SAS
processesa program in the following short overview. If you want a more detailed
description, see Introduction to SAS Programs and Macro Processingat support.sas.com,
or Burlew (2006).
When program statements aresubmitted, they are sent to the input stack, which is an area
of computer memory. The word scanner processes these program statements by
converting them to tokens. Tokensare directed to an ...
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