EBK CONCEPTS OF PROGRAMMING LANGUAGES
EBK CONCEPTS OF PROGRAMMING LANGUAGES
12th Edition
ISBN: 9780135102251
Author: Sebesta
Publisher: VST
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Chapter 4, Problem 10RQ

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Parsing problem for a top-down parser:

The top down parser attempts for a left most derivation on a left sentential form to get the next sentential form.

  • Suppose the left sentential form “xAa” has to be expanded to get the next form. We know that x is a string of terminals; A represents a non-terminal and α represents string containing both terminals and non-terminals.
  • The parser attempts for an expansion from left hand side of “xAa” by replacing the left most non- terminal A.
  • From the grammar rule the most appropriate rule with A on LHS is to be selected...

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