diff options
| -rw-r--r-- | Makefile.am | 4 | ||||
| -rw-r--r-- | guix/glob.scm | 97 | ||||
| -rw-r--r-- | tests/glob.scm | 58 |
3 files changed, 158 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am index e2c940ca8d..6556799e6b 100644 --- a/Makefile.am +++ b/Makefile.am @@ -1,5 +1,5 @@ # GNU Guix --- Functional package management for GNU -# Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org> +# Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org> # Copyright © 2013 Andreas Enge <andreas@enge.fr> # Copyright © 2015, 2017 Alex Kost <alezost@gmail.com> # Copyright © 2016, 2018 Mathieu Lirzin <mthl@gnu.org> @@ -83,6 +83,7 @@ MODULES = \ guix/gnu-maintenance.scm \ guix/upstream.scm \ guix/licenses.scm \ + guix/glob.scm \ guix/git.scm \ guix/graph.scm \ guix/cache.scm \ @@ -314,6 +315,7 @@ SCM_TESTS = \ tests/substitute.scm \ tests/builders.scm \ tests/derivations.scm \ + tests/glob.scm \ tests/grafts.scm \ tests/ui.scm \ tests/records.scm \ diff --git a/guix/glob.scm b/guix/glob.scm new file mode 100644 index 0000000000..4fc5173ac0 --- /dev/null +++ b/guix/glob.scm @@ -0,0 +1,97 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org> +;;; +;;; 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 (guix glob) + #:use-module (ice-9 match) + #:export (compile-glob-pattern + glob-match?)) + +;;; Commentary: +;;; +;;; This is a minimal implementation of "glob patterns" (info "(libc) +;;; Globbbing"). It is currently limited to simple patterns and does not +;;; support braces and square brackets, for instance. +;;; +;;; Code: + +(define (wildcard-indices str) + "Return the list of indices in STR where wildcards can be found." + (let loop ((index 0) + (result '())) + (if (= index (string-length str)) + (reverse result) + (loop (+ 1 index) + (case (string-ref str index) + ((#\? #\*) (cons index result)) + (else result)))))) + +(define (compile-glob-pattern str) + "Return an sexp that represents the compiled form of STR, a glob pattern +such as \"foo*\" or \"foo??bar\"." + (define flatten + (match-lambda + (((? string? str)) str) + (x x))) + + (let loop ((index 0) + (indices (wildcard-indices str)) + (result '())) + (match indices + (() + (flatten (cond ((zero? index) + (list str)) + ((= index (string-length str)) + (reverse result)) + (else + (reverse (cons (string-drop str index) + result)))))) + ((wildcard-index . rest) + (let ((wildcard (match (string-ref str wildcard-index) + (#\? '?) + (#\* '*)))) + (match (substring str index wildcard-index) + ("" (loop (+ 1 wildcard-index) + rest + (cons wildcard result))) + (str (loop (+ 1 wildcard-index) + rest + (cons* wildcard str result))))))))) + +(define (glob-match? pattern str) + "Return true if STR matches PATTERN, a compiled glob pattern as returned by +'compile-glob-pattern'." + (let loop ((pattern pattern) + (str str)) + (match pattern + ((? string? literal) (string=? literal str)) + (((? string? one)) (string=? one str)) + (('*) #t) + (('?) (= 1 (string-length str))) + (() #t) + (('* suffix . rest) + (match (string-contains str suffix) + (#f #f) + (index (loop rest + (string-drop str + (+ index (string-length suffix))))))) + (('? . rest) + (and (>= (string-length str) 1) + (loop rest (string-drop str 1)))) + ((prefix . rest) + (and (string-prefix? prefix str) + (loop rest (string-drop str (string-length prefix)))))))) diff --git a/tests/glob.scm b/tests/glob.scm new file mode 100644 index 0000000000..033eeb10fe --- /dev/null +++ b/tests/glob.scm @@ -0,0 +1,58 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org> +;;; +;;; 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 (test-glob) + #:use-module (guix glob) + #:use-module (srfi srfi-64)) + + +(test-begin "glob") + +(test-equal "compile-glob-pattern, no wildcards" + "foo" + (compile-glob-pattern "foo")) + +(test-equal "compile-glob-pattern, Kleene star" + '("foo" * "bar") + (compile-glob-pattern "foo*bar")) + +(test-equal "compile-glob-pattern, question mark" + '(? "foo" *) + (compile-glob-pattern "?foo*")) + +(test-assert "literal match" + (let ((pattern (compile-glob-pattern "foo"))) + (and (glob-match? pattern "foo") + (not (glob-match? pattern "foobar")) + (not (glob-match? pattern "barfoo"))))) + +(test-assert "trailing star" + (let ((pattern (compile-glob-pattern "foo*"))) + (and (glob-match? pattern "foo") + (glob-match? pattern "foobar") + (not (glob-match? pattern "xfoo"))))) + +(test-assert "question marks" + (let ((pattern (compile-glob-pattern "foo??bar"))) + (and (glob-match? pattern "fooxxbar") + (glob-match? pattern "fooZZbar") + (not (glob-match? pattern "foobar")) + (not (glob-match? pattern "fooxxxbar")) + (not (glob-match? pattern "fooxxbarzz"))))) + +(test-end "glob") |