54 lines
2.4 KiB
Common Lisp
54 lines
2.4 KiB
Common Lisp
;;;; -*- Mode: Lisp; Base: 10; Syntax: ANSI-Common-Lisp; Package: ANAPHORA -*-
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;;;; Copyright (c) 2003 Brian Mastenbrook
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;;;; Permission is hereby granted, free of charge, to any person obtaining
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;;;; a copy of this software and associated documentation files (the
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;;;; "Software"), to deal in the Software without restriction, including
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;;;; without limitation the rights to use, copy, modify, merge, publish,
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;;;; distribute, sublicense, and/or sell copies of the Software, and to
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;;;; permit persons to whom the Software is furnished to do so, subject to
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;;;; the following conditions:
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;;;; The above copyright notice and this permission notice shall be
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;;;; included in all copies or substantial portions of the Software.
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;;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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;;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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;;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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;;;; IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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;;;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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;;;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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;;;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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(in-package :anaphora)
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(defmacro internal-symbol-macrolet (&rest whatever)
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`(symbol-macrolet ,@whatever))
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(define-setf-expander internal-symbol-macrolet (binding-forms place &environment env)
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(multiple-value-bind (dummies vals newvals setter getter)
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(get-setf-expansion place env)
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(values dummies
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(substitute `(symbol-macrolet ,binding-forms it) 'it vals)
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newvals
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`(symbol-macrolet ,binding-forms ,setter)
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`(symbol-macrolet ,binding-forms ,getter))))
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(with-unique-names (s-indicator current-s-indicator)
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(defmacro symbolic (operation test &rest other-args)
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(with-unique-names (this-s)
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(let ((current-s (get s-indicator current-s-indicator)))
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(setf (get s-indicator current-s-indicator) this-s)
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`(symbol-macrolet
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((,this-s (internal-symbol-macrolet ((it ,current-s)) ,test))
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(it ,this-s))
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(,operation it ,@other-args)))))
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(defmacro anaphoric (op test &body body)
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(with-unique-names (this-s)
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(setf (get s-indicator current-s-indicator) this-s)
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`(let* ((it ,test)
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(,this-s it))
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(declare (ignorable ,this-s))
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(,op it ,@body)))))
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