[bug#38986] [PATCH] gnu: Add peg.

[bug#38986] [PATCH] gnu: Add peg.

[Josh Holland]

* gnu/packages/parser.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
---
 gnu/local.mk            |  2 ++
 gnu/packages/parser.scm | 55 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 gnu/packages/parser.scm

diff --git a/gnu/local.mk b/gnu/local.mk
index b7fa503257..c4f75ec775 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -26,6 +26,7 @@
 # Copyright © 2019 Evan Straw <evan.straw99@gmail.com>
 # Copyright © 2019 Brett Gilio <brettg@gnu.org>
 # Copyright © 2019 Amin Bandali <bandali@gnu.org>
+# Copyright © 2020 Josh Holland <josh@inv.alid.pw>
 #
 # This file is part of GNU Guix.
 #
@@ -384,6 +385,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/ots.scm				\
   %D%/packages/package-management.scm		\
   %D%/packages/parallel.scm			\
+  %D%/packages/parser.scm			\
   %D%/packages/password-utils.scm		\
   %D%/packages/patchutils.scm			\
   %D%/packages/pciutils.scm			\
diff --git a/gnu/packages/parser.scm b/gnu/packages/parser.scm
new file mode 100644
index 0000000000..40a16915df
--- /dev/null
+++ b/gnu/packages/parser.scm
@@ -0,0 +1,55 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Josh Holland <josh@inv.alid.pw>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages parser)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix download)
+  #:use-module (guix licenses)
+  #:use-module (guix packages))
+
+(define-public peg
+  (package
+    (name "peg")
+    (version "0.1.18")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://www.piumarta.com/software/peg/peg-"
+                    version ".tar.gz"))
+              (sha256
+               (base32
+                "114h1y4k8fwcq9m0hfk33dsp7ah8zxzjjzlk71x4iirzczfkn690"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:make-flags (list "CC=gcc"
+                          (string-append "PREFIX=" (assoc-ref %outputs "out")))
+       #:phases (modify-phases %standard-phases
+                  (delete 'configure))))
+    (synopsis "Parser generators for Parsing Expression Grammars (PEGs)")
+    (description "peg and leg are tools for generating recursive-descent
+parsers: programs that perform pattern matching on text.  They processes a
+Parsing Expression Grammar (PEG) [Ford 2004] to produce a program that
+recognises legal sentences of that grammar.  peg processes PEGs written using
+the original syntax described by Ford; leg processes PEGs written using
+slightly different syntax and conventions that are intended to make it an
+attractive replacement for parsers built with lex and yacc.  Unlike lex and
+yacc, peg and leg support unlimited backtracking, provide ordered choice as a
+means for disambiguation, and can combine scanning (lexical analysis) and
+parsing (syntactic analysis) into a single activity.")
+    (home-page "https://www.piumarta.com/software/peg/")
+    (license (x11-style "file://LICENSE.txt"))))
-- 
2.24.1

[bug#38986] Acknowledgement ([PATCH] gnu: Add peg.)

[Josh Holland]

FWIW, if maintainers prefer, this package could also justifiably be
named `pegleg`.  I stuck with the upstream tarball name for now.

--
Josh Holland

[bug#38986] [PATCH] gnu: Add peg.

[Jakub Kądziołka]

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On Mon, Jan 06, 2020 at 11:30:43AM +0000, Josh Holland wrote:
> * gnu/packages/parser.scm: New file.
> * gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
> ---
>  gnu/local.mk            |  2 ++
>  gnu/packages/parser.scm | 55 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 57 insertions(+)
>  create mode 100644 gnu/packages/parser.scm

Hi Josh,
it seems that PEG doesn't build fully from source, src/peg.peg-c is a
pre-generated file that's pretty much not human-readable. While
bootstrapping fully from source is not a hard requirement, sidestepping
it is usually reserved to highly-desirable packages. Could you take a
look at the possibility of generating src/peg.peg-c during build?

Meanwhile, I have fixed up the description a bit (texinfo markup,
grammar):

    (description "@command{peg} and @command{leg} are tools for generating
recursive-descent parsers: programs that perform pattern matching on text.
They process a Parsing Expression Grammar (PEG) to produce a program that
recognises legal sentences of that grammar.  @command{peg} processes PEGs
written using the original syntax described by Ford; @command{leg} processes
PEGs written using slightly different syntax and conventions that are intended
to make it an attractive replacement for parsers built with @command{lex}
and @command{yacc}.  Unlike @command{lex} and @command{yacc}, @command{peg}
and @command{leg} support unlimited backtracking, provide ordered choice
as a means for disambiguation, and can combine scanning (lexical analysis) and
parsing (syntactic analysis) into a single activity.")

Regards,
Jakub Kądziołka

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