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Use the Flex (a fast lexer generator) to generate a lexer. Flex is the tool for generating lexers. Flex implements the algorithm that convert RE to NFA and NFA to DFA for you. So, you only need to write an input source Flex file (filename.I), where you specify a specification of patterns (called rules) of the lexer using Regular Expressions and C code. You are expected to: 1. Describe the skeleton of an input Flex source file (filename.) and their functionalities. Three sections in the file: definitions, rules and user routines.

Use the Flex (a fast lexer generator) to generate a lexer. Flex is the tool for generating lexers. Flex implements the algorithm that convert RE to NFA and NFA to DFA for you. So, you only need to write an input source Flex file (filename.I), where you specify a specification of patterns (called rules) of the lexer using Regular Expressions and C code. You are expected to: 1. Describe the skeleton of an input Flex source file (filename.) and their functionalities. Three sections in the file: definitions, rules and user routines.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Use the Flex (a fast lexer generator) to generate a lexer. Flex is the tool for generating lexers. Flex implements the algorithm that convert RE to NFA and NFA to DFA for you. So, you only need to write an input source Flex file (filename.I), where you specify a specification of patterns (called rules) of the lexer using Regular Expressions and C code. You are expected to: 1. Describe the skeleton of an input Flex source file (filename.l) and their functionalities. Three sections in the file: definitions, rules and user routines. %{ Declaration Section Definitions section %% Rules Section User routines Section
Transcribed Image Text:Use the Flex (a fast lexer generator) to generate a lexer. Flex is the tool for generating lexers. Flex implements the algorithm that convert RE to NFA and NFA to DFA for you. So, you only need to write an input source Flex file (filename.I), where you specify a specification of patterns (called rules) of the lexer using Regular Expressions and C code. You are expected to: 1. Describe the skeleton of an input Flex source file (filename.l) and their functionalities. Three sections in the file: definitions, rules and user routines. %{ Declaration Section Definitions section %% Rules Section User routines Section
m ■ 2. Program and implement Flex. Know the working steps of Flex as below. Flex Source File (sample 1) Flex Compiler (Flex) Input Text File Lexical Analyzer Code (lex.yy.c) C Compiler Lexical Analyzer executable Output: Tokens Parser sample.I is a Flex source file containing the specification (rules) in the form of pairs of regular expressions and C code, for identifying tokens in the input text file. lex.yy.c defines a scanning routine yylex() that uses the specification to recognize tokens. Lexical analyzer executable is actually the lexer/scanner program (a.out/ .exe)! Requirement of submission part: your final submission to Canvas must have Four (4) files: the given "input_soucecode.txt", your Flex (.) file, output file (saving the result into two columns, one for tokens and another for lexemes, name it as "output". See the example in above option 1), and a readme file (including a brief instruction and commands i.e., how to set up and run your program).
Transcribed Image Text:m ■ 2. Program and implement Flex. Know the working steps of Flex as below. Flex Source File (sample 1) Flex Compiler (Flex) Input Text File Lexical Analyzer Code (lex.yy.c) C Compiler Lexical Analyzer executable Output: Tokens Parser sample.I is a Flex source file containing the specification (rules) in the form of pairs of regular expressions and C code, for identifying tokens in the input text file. lex.yy.c defines a scanning routine yylex() that uses the specification to recognize tokens. Lexical analyzer executable is actually the lexer/scanner program (a.out/ .exe)! Requirement of submission part: your final submission to Canvas must have Four (4) files: the given "input_soucecode.txt", your Flex (.) file, output file (saving the result into two columns, one for tokens and another for lexemes, name it as "output". See the example in above option 1), and a readme file (including a brief instruction and commands i.e., how to set up and run your program).
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