| bison | Version: 2.3.dfsg-1 |
A parser generator that is compatible with YACC
Bison is a general-purpose parser generator that converts a
grammar description for an LALR(1) context-free grammar into a C
program to parse that grammar. Once you are proficient with Bison, you
may use it to develop a wide range of language parsers, from those used
in simple desk calculators to complex programming languages.
Bison is upward compatible with Yacc: all properly-written Yacc
grammars ought to work with Bison with no change. Anyone familiar with
Yacc should be able to use Bison with little trouble. Documentation of
the program is in the bison-doc package.
| Required | UnixLib |
| Recommended | Nothing |
| Suggested | Nothing |
| Conflicts with | Nothing |
| flex | Version: 2.5.35-1 |
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.
| Required | UnixLib |
| Recommended | Nothing |
| Suggested | Nothing |
| Conflicts with | Nothing |
| m4 | Version: 1.4.13-1 |
a macro processing language
GNU `m4' is an implementation of the traditional UNIX macro
processor. It is mostly SVR4 compatible, although it has some
extensions (for example, handling more than 9 positional parameters to
macros). `m4' also has builtin functions for including files, running
shell commands, doing arithmetic, etc. Autoconf needs GNU `m4' for
generating `configure' scripts, but not for running them.
| Required | UnixLib |
| Recommended | Nothing |
| Suggested | Nothing |
| Conflicts with | Nothing |