Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / ice-9 / debugger / state.scm

diff --git a/guile18/ice-9/debugger/state.scm b/guile18/ice-9/debugger/state.scm
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+;;;; (ice-9 debugger state) -- debugger state representation
+
+;;; Copyright (C) 2002, 2006 Free Software Foundation, Inc.
+;;;
+;; This library is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU Lesser General Public
+;; License as published by the Free Software Foundation; either
+;; version 2.1 of the License, or (at your option) any later version.
+;; 
+;; This library 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
+;; Lesser General Public License for more details.
+;; 
+;; You should have received a copy of the GNU Lesser General Public
+;; License along with this library; if not, write to the Free Software
+;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+(define-module (ice-9 debugger state)
+  #:export (make-state
+           state-stack
+           state-index
+           state-flags
+           set-stack-index!))
+
+(define state-rtd (make-record-type "debugger-state" '(stack index flags)))
+(define state? (record-predicate state-rtd))
+(define make-state
+  (let ((make-state-internal (record-constructor state-rtd
+                                                '(stack index flags))))
+    (lambda (stack index . flags)
+      (make-state-internal stack index flags))))
+(define state-stack (record-accessor state-rtd 'stack))
+(define state-index (record-accessor state-rtd 'index))
+(define state-flags (record-accessor state-rtd 'flags))
+
+(define set-state-index! (record-modifier state-rtd 'index))
+
+(define (set-stack-index! state index)
+  (let* ((stack (state-stack state))
+        (ssize (stack-length stack)))
+    (set-state-index! state
+                     (cond ((< index 0) 0)
+                           ((>= index ssize) (- ssize 1))
+                           (else index)))))
+
+;;; (ice-9 debugger state) ends here.