Concepts Of Programming Languages
Concepts Of Programming Languages
12th Edition
ISBN: 9780134997186
Author: Sebesta, Robert W.
Publisher: Pearson,
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Chapter 4, Problem 5RQ

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Three building approaches of a lexical analyzer:

The main function of a lexical analyzer is to separate tokens from the input program and to check it syntax validity. The three main approaches to build a lexical analyzer are:

  • As lexical analysis involves pattern matching, patterns of the tokens are to be formally described using a language related to regular expression. These formal descriptions for patterns are inputted to an automated software tool which generates a lexical analyzer.
  • The second approach is to design a state transition diagram which describes the token patterns...

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