Lex & yacc, 2nd Edition - NYLXS
lex & yacc, 2nd Edition
lex & yacc, 2nd Edition
by
Published by OReilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
Revision History for the :
See for release details.
ISBN: 978-1-565-92000-2
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Whats New in the Second Edition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Scope of This Book. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
Availability of Lex and Yacc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Sample Programs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Conventions Used in This Handbook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
1.
Lex and Yacc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
The Simplest Lex Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recognizing Words with Lex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Symbol Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Grammars. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Parser-Lexer Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
The Parts of Speech Lexer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
A Yacc Parser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
The Rules Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Running Lex and Yacc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Lex vs. Hand-written Lexers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Exercises. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.
Using Lex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Regular Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Examples of Regular Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
A Word Counting Program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Parsing a Command Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Start States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
iii
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