Add environment

* geesh/environment.scm: New file.
* tests/environment.scm: New file.
* Makefile.am: Add them.
This commit is contained in:
Timothy Sample 2018-07-11 21:51:54 -04:00
parent 2b05199562
commit 6678ae1e59
3 changed files with 111 additions and 0 deletions

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@ -37,6 +37,7 @@ endif # HAVE_GENHTML
test-list: ; @echo $(TESTS)
MODULES = \
geesh/environment.scm \
geesh/lexer.scm \
geesh/parser.scm \
geesh/repl.scm
@ -45,6 +46,7 @@ bin_SCRIPTS = \
scripts/geesh
TESTS = \
tests/environment.scm \
tests/lexer.scm \
tests/parser.scm \
tests/repl.scm

53
geesh/environment.scm Normal file
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@ -0,0 +1,53 @@
;;; The Geesh Shell Interpreter
;;; Copyright 2018 Timothy Sample <samplet@ngyro.com>
;;;
;;; This file is part of Geesh.
;;;
;;; Geesh 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.
;;;
;;; Geesh 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 Geesh. If not, see <http://www.gnu.org/licenses/>.
(define-module (geesh environment)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:export (<environment>
make-environment
environment?
var-ref
set-var!))
;;; Commentary:
;;;
;;; This module contains data structures and functions for the
;;; environment of the Shell language.
;;;
;;; Code:
(define-record-type <environment>
(%make-environment vars)
environment?
(vars environment-vars set-environment-vars!))
(define (make-environment vars)
;; In order to insure that each pair in the 'vars' alist is mutable,
;; we copy each one into a new list.
(%make-environment (map (match-lambda
((key . val) (cons key val)))
vars)))
(define (var-ref env name)
(assoc-ref (environment-vars env) name))
(define (set-var! env name val)
(set-environment-vars! env (acons name val
(environment-vars env))))

56
tests/environment.scm Normal file
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@ -0,0 +1,56 @@
;;; The Geesh Shell Interpreter
;;; Copyright 2018 Timothy Sample <samplet@ngyro.com>
;;;
;;; This file is part of Geesh.
;;;
;;; Geesh 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.
;;;
;;; Geesh 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 Geesh. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-environment)
#:use-module (geesh environment)
#:use-module (srfi srfi-64)
#:use-module (tests automake))
;;; Commentary:
;;;
;;; Tests for the environment module.
;;;
;;; Code:
(test-begin "environment")
;;;
;;; Variables.
;;;
(test-equal "Stores existing variables"
"bar"
(let ((env (make-environment '(("FOO" . "bar")))))
(var-ref env "FOO")))
(test-equal "Stores new variables"
"bar"
(let ((env (make-environment '())))
(set-var! env "FOO" "bar")
(var-ref env "FOO")))
(test-equal "Updates variables"
"baz"
(let ((env (make-environment '(("FOO" . "bar")))))
(set-var! env "FOO" "baz")
(var-ref env "FOO")))
(test-equal "Returns '#f' for unset variables"
#f
(let ((env (make-environment '())))
(var-ref env "FOO")))