Language Processors
The macro processor must perform

recognize macro definitions and macro calls
expand macro calls and substitute arguments
All of these
save the macro definitions

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Language Processors
In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with

recognition of basic elements and creation of uniform symbols
use of macro processor to produce more optimal assembly code
recognition of basic syntactic constructs through reductions
creation of more optional matrix

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