gnu/packages/flex.scm

   1 ;;; GNU Guix --- Functional package management for GNU
   2 ;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
   3 ;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
   4 ;;;
   5 ;;; This file is part of GNU Guix.
   6 ;;;
   7 ;;; GNU Guix is free software; you can redistribute it and/or modify it
   8 ;;; under the terms of the GNU General Public License as published by
   9 ;;; the Free Software Foundation; either version 3 of the License, or (at
  10 ;;; your option) any later version.
  11 ;;;
  12 ;;; GNU Guix is distributed in the hope that it will be useful, but
  13 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;;; GNU General Public License for more details.
  16 ;;;
  17 ;;; You should have received a copy of the GNU General Public License
  18 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 (define-module (gnu packages flex)
  21   #:use-module (guix licenses)
  22   #:use-module (guix packages)
  23   #:use-module (guix download)
  24   #:use-module (guix build-system gnu)
  25   #:use-module (gnu packages)
  26   #:use-module (gnu packages m4)
  27   #:use-module (gnu packages man)
  28   #:use-module (gnu packages bison)
  29   #:use-module (gnu packages indent)
  30   #:use-module (srfi srfi-1))
  31
  32 (define-public flex
  33   (package
  34     (name "flex")
  35     (version "2.6.4")
  36     (source (origin
  37               (method url-fetch)
  38               (uri (string-append
  39                     "https://github.com/westes/flex"
  40                     "/releases/download/v" version "/"
  41                     "flex-" version ".tar.gz"))
  42               (sha256
  43                (base32
  44                 "15g9bv236nzi665p9ggqjlfn4dwck5835vf0bbw2cz7h5c1swyp8"))))
  45     (build-system gnu-build-system)
  46     (inputs
  47      (let ((bison-for-tests
  48             ;; Work around an incompatibility with Bison 3.0:
  49             ;; <http://lists.gnu.org/archive/html/bug-bison/2013-09/msg00014.html>.
  50             (package
  51               (inherit bison)
  52               (version "2.7.1")
  53               (source (origin
  54                         (method url-fetch)
  55                         (uri (string-append
  56                               "mirror://gnu/bison/"
  57                               "bison-" version ".tar.xz"))
  58                         (sha256
  59                          (base32
  60                           "1yx7isx67sdmyijvihgyra1f59fwdz7sqriginvavfj5yb5ss2dl"))))
  61
  62               ;; Unlike Bison 3.0, this version did not need Flex for its
  63               ;; tests, so it allows us to break the cycle.
  64               (inputs (alist-delete "flex" (package-inputs bison))))))
  65        `(("bison" ,bison-for-tests)
  66          ("indent" ,indent))))
  67     ;; m4 is not present in PATH when cross-building
  68     (native-inputs
  69      `(("help2man" ,help2man)
  70        ("m4" ,m4)))
  71     (propagated-inputs `(("m4" ,m4)))
  72     (home-page "https://github.com/westes/flex")
  73     (synopsis "Fast lexical analyser generator")
  74     (description
  75      "Flex is a tool for generating scanners.  A scanner, sometimes
  76 called a tokenizer, is a program which recognizes lexical patterns in
  77 text.  The flex program reads user-specified input files, or its standard
  78 input if no file names are given, for a description of a scanner to
  79 generate.  The description is in the form of pairs of regular expressions
  80 and C code, called rules.  Flex generates a C source file named,
  81 \"lex.yy.c\", which defines the function yylex().  The file \"lex.yy.c\"
  82 can be compiled and linked to produce an executable.  When the executable
  83 is run, it analyzes its input for occurrences of text matching the
  84 regular expressions for each rule.  Whenever it finds a match, it
  85 executes the corresponding C code.")
  86     (license (non-copyleft "file://COPYING"
  87                            "See COPYING in the distribution."))))