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; Standard IO Library
; read-string.lisp
; Copyright (C) 2013 Centaur Technology
;
; Contact:
; Centaur Technology Formal Verification Group
; 7600-C N. Capital of Texas Highway, Suite 300, Austin, TX 78731, USA.
; http://www.centtech.com/
;
; License: (An MIT/X11-style license)
;
; Permission is hereby granted, free of charge, to any person obtaining a
; copy of this software and associated documentation files (the "Software"),
; to deal in the Software without restriction, including without limitation
; the rights to use, copy, modify, merge, publish, distribute, sublicense,
; and/or sell copies of the Software, and to permit persons to whom the
; Software is furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
; DEALINGS IN THE SOFTWARE.
;
; Original author: Jared Davis <jared@centtech.com>
(in-package "ACL2")
(defparameter *read-string-should-check-bad-lisp-object* t)
(defun read-string-fn (str state)
(handler-case
(progn (unless (live-state-p state)
(error "read-string requires a live state!"))
(let ((acc nil)
(*readtable* *acl2-readtable*)
(*package* (find-package (current-package state))))
(with-input-from-string
(stream str)
(loop do
(let* ((eof-marker (cons nil nil))
(elem (read stream nil eof-marker)))
(if (eq elem eof-marker)
(loop-finish)
(push elem acc)))))
(setq acc (nreverse acc))
(let ((msg (and *read-string-should-check-bad-lisp-object*
(bad-lisp-objectp acc))))
(if msg
(mv msg nil state)
(mv nil acc state)))))
(error (condition)
(return-from read-string-fn
(mv (format nil "~A" condition) nil state)))
;; Really bad-lisp-objectp shouldn't just stack-overflow on #1=(a . #1#).
;; Catching it is tricky...
;; "Because such a condition is indicative of a limitation of the
;; implementation or of the image rather than an error in a program,
;; objects of type storage-condition are not of type error."
(storage-condition (condition)
(return-from read-string-fn
(mv (format nil "~A" condition) nil state)))))
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