What is a possible reason why the Lexer and the parser are two different entities? Group of answer choices The lexer does not need to deal with external environment necessities, like identifying tokens Parsers cannot do all the work that lexers do CFGs are easier to understand using lexers than parser based Regular expressions Regular Expression based lexers are easier to automate than CFG parsers

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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What is a possible reason why the Lexer and the parser are two different entities?
Group of answer choices
The lexer does not need to deal with external environment necessities, like identifying tokens
Parsers cannot do all the work that lexers do
CFGs are easier to understand using lexers than parser based Regular expressions
Regular Expression based lexers are easier to automate than CFG parsers
 
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