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 21RQ

Explanation of Solution

Handle of a sentential form:

A bottom up parser attempts for a reduction from right hand side of right sentential form (γ) by replacing the right most sub-string (assume it be β) of terminals and non-terminals. From the grammar rule the most appropriate rule with β on RHS is to be selected. The correct RHS is called handle.

  • A handle of a sentential form is a substring β such that, β matches with a rule A β in the grammar and replacing β with A is a step in the reverse of the right most derivation of a string.
  • The formal definition of a handle can be given as: For a right sentential form γ=αβw, β is the handle if and only if ⇒</

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