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[ Source: flex  ]

Package: flex (2.5.35-7)

A fast lexical analyzer generator.

Flex is a tool for generating scanners: programs which recognized lexical patterns in text. It reads the given input files for a description of a scanner to generate. The description is in the form of pairs of regular expressions and C code, called rules. Flex generates as output a C source file, lex.yy.c, which defines a routine yylex(). This file is compiled and linked with the -lfl library to produce an executable. When the executable is run, it analyzes its input for occurrences of the regular expressions. Whenever it finds one, it executes the corresponding C code.

The behaviour of Flex has undergone a major change since version 2.5.4a. Flex scanners are now reentrant, and it is now possible to have multiple scanners in the same program with differing sets of defaults, and the scanners play nicer with modern C and C++ compilers. The Flip side is that Flex no longer conforms to the POSIX lex behaviour, and the scanners require conforming implementations when flex is used in ANSI C mode. The package flex-old provides the older behaviour.

Tags: Software Development: Code Generation, Implemented in: C, User Interface: Command Line, Role: Program, Scope: Utility, Works with: Source Code

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Download flex

Download for all available architectures
Architecture Package Size Installed Size Files
alpha 324.4 kB1040 kB [list of files]
amd64 324.7 kB1004 kB [list of files]
armel 313.5 kB984 kB [list of files]
avr32 (unofficial port) 314.4 kB956 kB [list of files]
hppa 320.8 kB988 kB [list of files]
hurd-i386 307.1 kB976 kB [list of files]
i386 307.4 kB972 kB [list of files]
ia64 352.9 kB1244 kB [list of files]
kfreebsd-amd64 323.0 kB882 kB [list of files]
kfreebsd-i386 307.0 kB846 kB [list of files]
m68k (unofficial port) 295.7 kB964 kB [list of files]
mips 321.8 kB1036 kB [list of files]
mipsel 321.1 kB1036 kB [list of files]
powerpc 318.8 kB996 kB [list of files]
s390 318.8 kB996 kB [list of files]
sparc 312.2 kB992 kB [list of files]