Flex, version 2.5.23

A fast scanner generator

Edition 2.5.23, 21 October 2002

• Copyright
• Reporting Bugs
• Introduction
• Some Simple Examples
• Format of the Input File
  • Format of the Definitions Section
  • Format of the Rules Section
  • Format of the User Code Section
  • Comments in the Input
• Patterns
• How the Input Is Matched
• Actions
• The Generated Scanner
• Start Conditions
• Multiple Input Buffers
• End-of-File Rules
• Miscellaneous Macros
• Values Available To the User
• Interfacing with Yacc
• Scanner Options
  • Options for Specifing Filenames
  • Options Affecting Scanner Behavior
  • Code-Level And API Options
  • Options for Scanner Speed and Size
  • Debugging Options
  • Miscellaneous Options
• Performance Considerations
• Generating C++ Scanners
• Reentrant C Scanners
  • Uses for Reentrant Scanners
  • An Overview of the Reentrant API
  • Reentrant Example
  • The Reentrant API in Detail
    • Declaring a Scanner As Reentrant
    • The Extra Argument
    • Global Variables Replaced By Macros
    • Init and Destroy Functions
    • Accessing Variables with Reentrant Scanners
    • Extra Data
    • About yyscan_t
  • Functions and Macros Available in Reentrant C Scanners
• Incompatibilities with Lex and Posix
• Memory Management
  • The Default Memory Management
  • Overriding The Default Memory Management
  • A Note About yytext And Memory
• Serialized Tables
  • Creating Serialized Tables
  • Loading and Unloading Serialized Tables
  • Tables File Format
• Diagnostics
• Limitations
• Additional Reading
• FAQ
  • When was flex born?
  • How do I expand \ escape sequences in C-style quoted strings?
  • Why do flex scanners call fileno if it is not ANSI compatible?
  • Does flex support recursive pattern definitions?
  • How do I skip huge chunks of input (tens of megabytes) while using flex?
  • Flex is not matching my patterns in the same order that I defined them.
  • My actions are executing out of order or sometimes not at all.
  • How can I have multiple input sources feed into the same scanner at the same time?
  • Can I build nested parsers that work with the same input file?
  • How can I match text only at the end of a file?
  • How can I make REJECT cascade across start condition boundaries?
  • Why can't I use fast or full tables with interactive mode?
  • How much faster is -F or -f than -C?
  • If I have a simple grammar can't I just parse it with flex?
  • Why doesn't yyrestart() set the start state back to INITIAL?
  • How can I match C-style comments?
  • The '.' isn't working the way I expected.
  • Can I get the flex manual in another format?
  • Does there exist a "faster" NDFA->DFA algorithm?
  • How does flex compile the DFA so quickly?
  • How can I use more than 8192 rules?
  • How do I abandon a file in the middle of a scan and switch to a new file?
  • How do I execute code only during initialization (only before the first scan)?
  • How do I execute code at termination?
  • Where else can I find help?
  • Can I include comments in the "rules" section of the file?
  • I get an error about undefined yywrap().
  • How can I change the matching pattern at run time?
  • How can I expand macros in the input?
  • How can I build a two-pass scanner?
  • How do I match any string not matched in the preceding rules?
  • I am trying to port code from AT&T lex that uses yysptr and yysbuf.
  • Is there a way to make flex treat NULL like a regular character?
  • Whenever flex can not match the input it says "flex scanner jammed".
  • Why doesn't flex have non-greedy operators like perl does?
  • Memory leak - 16386 bytes allocated by malloc.
  • How do I track the byte offset for lseek()?
  • How do I use my own I/O classes in a C++ scanner?
  • How do I skip as many chars as possible?
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• Appendices
  • Makefiles and Flex
  • C Scanners with Bison Parsers
• Indices
  • Concept Index
  • Index of Functions and Macros
  • Index of Variables
  • Index of Data Types
  • Index of Hooks
  • Index of Scanner Options

This document was generated on 9 November 2002 using texi2html 1.56k.