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33 lines
1.2 KiB
Scheme
33 lines
1.2 KiB
Scheme
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;; Copyright (C) 2015
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;; "Mu Lei" known as "NalaGinrut" <NalaGinrut@gmail.com>
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;; This file is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This file is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (env)
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(export make-Env)
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(import (guile) (types)))
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(define* (make-Env #:key (outer nil) (bindings '()))
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(define _env (make-hash-table))
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(define (_set k v) (hash-set! _env k v))
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(define (_get k)
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(or (hash-ref _env k) (and (not (_nil? outer)) ((outer 'find) k))))
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(define (_find k) (_get k))
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(for-each (lambda (b) (hash-set! _env (car b) (cdr b))) bindings)
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(lambda (cmd)
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(case cmd
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((set) _set)
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((find) _find)
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((get) _get)
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(else (throw 'mal-error "BUG: Invalid cmd" cmd)))))
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