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CS112 Parsers Course Notes: Recognizing Languages

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CS112 Parsers Course Notes: Recognizing Languages

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Questions and Answers

What is one technique for implementing a top-down parser?

Bottom-up parsing

Left-recursive productions

Backtracking

Recursive Descent (correct)

Why can left-recursive productions not be handled by a Recursive Descent parser?

They require a bottom-up approach

Recursion will continue indefinitely without consuming any symbols (correct)

They require a different parsing algorithm

They are not supported by the grammar

How can a grammar with left recursion be converted for use with a Recursive Descent parser?

It cannot be converted for use with a Recursive Descent parser

By converting it to a grammar with only right-recursion (correct)

By using a different parsing technique

By adding additional production rules

What is the process for writing a Recursive Descent parser?

Create a function shell for each non-terminal and fill in the details based on the right-hand sides (C) Signup and view all the answers

What type of parser builds parse trees from the root down as tokens are processed?

Predictive parser (B) Signup and view all the answers

What is the key difference between left-recursive and right-recursive productions in the context of Recursive Descent parsing?

Left-recursive productions cannot be handled by Recursive Descent parsers (D) Signup and view all the answers

Which type of parser uses left-to-right processing of the string and leftmost derivation of the parse tree?

LL parser (D) Signup and view all the answers

What does LL(1) mean in the context of parsers?

Requires one token lookahead (A) Signup and view all the answers

What is a limitation of LL parsers compared to LR parsers?

Cannot handle left-recursion (D) Signup and view all the answers

Which type of parser is described as the most general but also the most complicated to implement?

LR (C) Signup and view all the answers

What is the main purpose of a parser?

To convert generators into recognizers (B) Signup and view all the answers

What is the key difference between bottom-up parsers and other types of parsers?

Bottom-up parsers build the parse tree from the leaves up to the root (D) Signup and view all the answers

What is the main advantage of using a bottom-up parser over other types of parsers?

Bottom-up parsers never have to "guess" during the parsing process (A) Signup and view all the answers

What is the relationship between LR(k) grammars and bottom-up parsers?

LR(k) grammars correspond to bottom-up parsers, with k symbols of lookahead required (C) Signup and view all the answers

What is the purpose of restricting PDAs to be deterministic in the context of parsing?

To eliminate the need for guessing during the parsing process (A) Signup and view all the answers