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Description: 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.
Description: A fast lexical analyzer generator.
flex is a tool for generating scanners: programs which recognized lexical
patterns in text. flex 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 reenterant, you may have multiple
scanners in the same program with differing sets of defaults, and
they 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.
.
This product includes software developed by the University of California,
Berkeley and its contributors. The upstream source code can be found at
http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
The project web page is at http://flex.sf.net/
--- 43860 Thu Jan 1 00:00:00 1970
+++ 22786 Thu Jan 1 00:00:00 1970
@@ -1,18 +1,22 @@
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
+ flex is a tool for generating scanners: programs which recognized lexical
+ patterns in text. flex 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
+ 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
+ 2.5.4a; Flex scanners are now reenterant, you may have multiple
- have multiple scanners in the same program with differing sets of
+ scanners in the same program with differing sets of defaults, and
- defaults, and the scanners play nicer with modern C and C++
+ they play nicer with modern C and C++ compilers. The Flip side is
- compilers. The Flip side is that Flex no longer conforms to the POSIX
+ that Flex no longer conforms to the POSIX lex behaviour, and the
- lex behaviour, and the scanners require conforming implementations
+ scanners require conforming implementations when flex is used in ANSI
- when flex is used in ANSI C mode. The package flex-old provides the
+ C mode. The package flex-old provides the older behaviour.
- older behaviour.
+ .
+ This product includes software developed by the University of California,
+ Berkeley and its contributors. The upstream source code can be found at
+ http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
+ The project web page is at http://flex.sf.net/