flex & bison > A Reference for Flex Specifications > Structure of a Flex Specification

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flex & bison

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Preface

Ch. 1. Introducing Flex and Bison

Ch. 2. Using Flex

Ch. 3. Using Bison

Ch. 4. Parsing SQL

Ch. 5. A Reference for Flex Specifications

Structure of a Flex Specification

BEGIN

C++ Scanners

Context Sensitivity

Definitions (Substitutions)

ECHO

Input Management

Flex Library

Interactive and Batch Scanners

Line Numbers and yylineno

Literal Block

Multiple Lexers in One Program

Options When Building a Scanner

Portability of Flex Lexers

Reentrant Scanners

Regular Expression Syntax

REJECT

Returning Values from yylex()

yy_scan_string and yy_scan_buffer

YY_USER_ACTION

yywrap()

Ch. 6. A Reference for Bison Specifications

Ch. 7. Ambiguities and Conflicts

Ch. 8. Error Reporting and Recovery

Ch. 9. Advanced Flex and Bison

Appx. A. SQL Parser Grammar and Cross-Reference

Glossary

Colophon

Index

5.1. Structure of a Flex Specification

A flex program consists of three parts: the definition section, the rules section, and the user subroutines.

...definition section ...
%%
            
... rules section ...
%%
... user subroutines ...

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Contents

Chapter 5. A Reference for Flex Specific... > Structure of a Flex Specification

5.1. Structure of a Flex Specification