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+#| -*-Scheme-*-
+
+$Id: symbol.scm,v 1.1 1992/12/07 22:07:36 cph Exp $
+
+Copyright (c) 1992 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  Permission to copy this software, to redistribute
+it, and to use it for any purpose is granted, subject to the following
+restrictions and understandings.
+
+1. Any copy made of this software must include this copyright notice
+in full.
+
+2. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. |#
+
+;;;; Symbols
+;;; package: (runtime scode)
+
+(declare (usual-integrations))
+\f
+(define (symbol? object)
+  (or (interned-symbol? object)
+      (uninterned-symbol? object)))
+
+(define-integrable (interned-symbol? object)
+  (object-type? (ucode-type interned-symbol) object))
+
+(define-integrable (uninterned-symbol? object)
+  (object-type? (ucode-type uninterned-symbol) object))
+
+(define (string->uninterned-symbol string)
+  (if (not (string? string))
+      (error:wrong-type-argument string "string" 'STRING->UNINTERNED-SYMBOL))
+  ((ucode-primitive system-pair-cons)
+   (ucode-type uninterned-symbol)
+   string
+   ;; Magic: must match microcode and "urtrap".
+   ((ucode-primitive primitive-object-set-type)
+    (ucode-type reference-trap)
+    2)))
+
+(define (string->symbol string)
+  ;; This prevents the symbol from being affected if the string
+  ;; is mutated.  The string is copied only if the symbol is
+  ;; created.
+  (or ((ucode-primitive find-symbol) string)
+      ((ucode-primitive string->symbol) (string-copy string))))
+
+(define-integrable (intern string)
+  ((ucode-primitive string->symbol) (string-downcase string)))
+
+(define-integrable (intern-soft string)
+  ((ucode-primitive find-symbol) (string-downcase string)))
+
+(define (symbol-name symbol)
+  (if (not (symbol? symbol))
+      (error:wrong-type-argument symbol "symbol" 'SYMBOL-NAME))
+  (system-pair-car symbol))
+
+(define-integrable (symbol->string symbol)
+  (string-copy (symbol-name symbol)))
+
+(define (symbol-append . symbols)
+  (let ((string (apply string-append (map symbol-name symbols))))
+    (string-downcase! string)
+    ((ucode-primitive string->symbol) string)))
+
+(define-integrable (symbol-hash symbol)
+  (string-hash (symbol-name symbol)))
+
+(define-integrable (symbol-hash-mod symbol modulus)
+  (string-hash-mod (symbol-name symbol) modulus))
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