Language Processors
The macro processor must perform

expand macro calls and substitute arguments
All of these
recognize macro definitions and macro calls
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 syntactic constructs through reductions
use of macro processor to produce more optimal assembly code
creation of more optional matrix
recognition of basic elements and creation of uniform symbols

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