Flex (fast lexical analyzer generator )
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FLEX is a tool that generates programs for performing pattern-matching on text. It automates the conversion of regular expressions (RE) to nondeterministic finite automata (NFA) and NFA to deterministic finite automata (DFA), allowing developers to build lexical analyzers. The workflow involves writing rules in a .l file, FLEX generating a C file containing the scanner, and compiling that C file along with additional code to produce an executable that takes input and produces a sequence of tokens.
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This document discusses Lex and Yacc, which are tools used to generate lexical analyzers and parsers. Lex reads input specifying a lexical analyzer and outputs C code implementing it. Yacc reads a grammar and generates a C parser. The document provides examples of Lex and Yacc code and explains how they are linked and used together, with Lex generating tokens that are passed to a Yacc parser. Key aspects covered include the structure and sections of Lex and Yacc programs, and how they are compiled and linked to recognize formal languages.
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Flex (fast lexical analyzer generator )
- 1. FLEX (Fast Lexical Analyzer Generator) Introduction, Workflow and Illustrative Examples Sandip Basnet (@mondyfy)
- 2. CONTENTS ● Introduction to FLEX. ● How does Flex works(Workflow of FLEX). ● Environment setup || Installing FLEX. ● Structure of FLEX program. ● Illustrative Examples ● Conclusion
- 3. INTRODUCTION TO FLEX ● FLEX(The Fast Lexical Analyzer). ● Tool for generating programs that performs pattern-matching on text. ● Free implementation of original UNIX Lex
- 4. WHY FLEX ? ● To build lexical analyzer you have to follow:
- 5. SO WHAT DOES FLEX DO THEN? ● FLEX automates the conversion RE to NFA & NFA to DFA
- 6. WORK FLOW OF FLEX Fig: Illustration of use of FLEX
- 7. WORKING STEPS OF FLEX Flex C Compiler a.out Scanner .l file (source file) lex.yy.c lex.yy.c a.out Input Stream Sequence of tokens
- 8. THANK YOU!