primitives.lsp

"Copyright (c) 2010-2015, Mark Tarver

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. The name of Mark Tarver may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY Mark Tarver ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL Mark Tarver BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."

(SETQ *user-syntax-in* NIL)

(DEFMACRO if (X Y Z)
  `(LET ((*C* ,X))
       (COND ((EQ *C* 'true) ,Y)
             ((EQ *C* 'false) ,Z)
             (T (ERROR "~S is not a boolean~%" *C*)))))

(DEFMACRO and (X Y) `(if ,X (if ,Y 'true 'false) 'false))

(DEFMACRO or (X Y) `(if ,X 'true (if ,Y 'true 'false)))

(DEFUN set (X Y) (SET X Y))

(DEFUN value (X) (SYMBOL-VALUE X))

(DEFUN simple-error (String) (ERROR "~A" String))

(DEFMACRO trap-error (X F)
`(HANDLER-CASE ,X (ERROR (Condition) (FUNCALL ,F Condition))))

(DEFUN error-to-string (E)
   (IF (TYPEP E 'CONDITION)
       (FORMAT NIL "~A" E)
       (ERROR "~S is not an exception~%" E)))

(DEFUN cons (X Y) (CONS X Y))

(DEFUN hd (X) (CAR X))

(DEFUN tl (X) (CDR X))

(DEFUN cons? (X) (IF (CONSP X) 'true 'false))

(DEFUN intern (String) (INTERN (shen.process-intern String)))

(DEFUN shen.process-intern (S)
   (COND ((STRING-EQUAL S "") S)
         ((STRING-EQUAL (pos S 0) "#") 
          (cn "_hash1957" (shen.process-intern (tlstr S))))
         ((STRING-EQUAL (pos S 0) "'") 
          (cn "_quote1957" (shen.process-intern (tlstr S))))
         ((STRING-EQUAL (pos S 0) "`") 
          (cn "_backquote1957" (shen.process-intern (tlstr S))))
         ((STRING-EQUAL (pos S 0) "|") 
          (cn "bar!1957" (shen.process-intern (tlstr S))))
         (T (cn (pos S 0) (shen.process-intern (tlstr S))))))

(DEFUN eval-kl (X)
  (LET ((E (EVAL (shen.kl-to-lisp NIL X))))
       (IF (AND (CONSP X) (EQ (CAR X) 'defun))
           (COMPILE E)
           E)))

(DEFMACRO lambda (X Y) `(FUNCTION (LAMBDA (,X) ,Y)))

(DEFMACRO let (X Y Z) `(LET ((,X ,Y)) ,Z))

(DEFUN shen.equal? (X Y)
   (IF (shen.ABSEQUAL X Y) 'true 'false))

(DEFUN shen.ABSEQUAL (X Y)
  (COND ((AND (CONSP X) (CONSP Y) (shen.ABSEQUAL (CAR X) (CAR Y)))
         (shen.ABSEQUAL (CDR X) (CDR Y)))
        ((AND (STRINGP X) (STRINGP Y))
         (STRING= X Y))
        ((AND (NUMBERP X) (NUMBERP Y))
         (= X Y))
        ((AND (ARRAYP X) (ARRAYP Y))
         (CF-VECTORS X Y (LENGTH X) (LENGTH Y)))
        (T
         (EQUAL X Y))))

(DEFUN CF-VECTORS (X Y LX LY)
   (AND (= LX LY)
        (CF-VECTORS-HELP X Y 0 (1- LX))))

(DEFUN CF-VECTORS-HELP (X Y COUNT MAX)
  (COND ((= COUNT MAX) (shen.ABSEQUAL (AREF X MAX) (AREF Y MAX)))
        ((shen.ABSEQUAL (AREF X COUNT) (AREF Y COUNT)) (CF-VECTORS-HELP X Y (1+ COUNT) MAX))
        (T NIL)))

(DEFMACRO freeze (X) `(FUNCTION (LAMBDA () ,X)))

(DEFUN absvector (N) (MAKE-ARRAY (LIST N)))

(DEFUN absvector? (X) (IF (ARRAYP X) 'true 'false))

(DEFUN address-> (Vector N Value) (SETF (AREF Vector N) Value) Vector)

(DEFUN <-address (Vector N)
  (trap-error (AREF Vector N)
              (LAMBDA (N)
                (ERROR "~A out of range in vector~%" N))))

(DEFUN n->string (N) (FORMAT NIL "~C" (CODE-CHAR N)))

(DEFUN string->n (S) (CHAR-CODE (CAR (COERCE S 'LIST))))

(DEFUN read-byte (S) (READ-BYTE S NIL -1))

(DEFUN write-byte (Byte S) (WRITE-BYTE Byte S))

(DEFUN open (String Direction)
   (LET ((Path (FORMAT NIL "~A~A" *home-directory* String)))
        (shen.openh Path Direction)))

(DEFUN shen.openh (Path Direction)
      (COND ((EQ Direction 'in)
             (OPEN Path :DIRECTION :INPUT
                        :ELEMENT-TYPE 'UNSIGNED-BYTE))
            ((EQ Direction 'out)
             (OPEN Path :DIRECTION :OUTPUT
                        :ELEMENT-TYPE 'UNSIGNED-BYTE
                        :IF-EXISTS :SUPERSEDE))
            (T (ERROR "invalid direction"))))

(DEFUN type (X MyType) (DECLARE (IGNORE MyType)) X)

(DEFUN close (Stream) (CLOSE Stream) NIL)

(DEFUN pos (X N) (COERCE (LIST (CHAR X N)) 'STRING))

(DEFUN tlstr (X) (SUBSEQ X 1))

(DEFUN cn (Str1 Str2)
  (DECLARE ((TYPE STRING Str1) (TYPE STRING Str2)))
   (CONCATENATE 'STRING Str1 Str2))

(DEFUN string? (S) (IF (STRINGP S) 'true 'false))

(DEFUN str (X)
  (COND ((NULL X) (ERROR "[] is not an atom in Shen; str cannot convert it to a string.~%"))
        ((SYMBOLP X)
         (shen.process-string (SYMBOL-NAME X)))
        ((NUMBERP X)
         (shen.process-number (FORMAT NIL "~A" X)))
        ((STRINGP X) (FORMAT NIL "~S" X))
        ((STREAMP X) (FORMAT NIL "~A" X))
        ((FUNCTIONP X) (FORMAT NIL "~A" X))
        (T (ERROR "~S is not an atom, stream or closure; str cannot convert it to a string.~%" X))))

(DEFUN shen.process-number (S)
  (COND ((STRING-EQUAL S "") "")
        ((STRING-EQUAL (pos S 0) "d")
         (IF (STRING-EQUAL (pos S 1) "0")
             ""
             (cn "e" (tlstr S))))
        (T (cn (pos S 0) (shen.process-number (tlstr S))))))

(DEFUN shen.process-string (X)
   (COND ((STRING-EQUAL X "") X)
         ((AND (> (LENGTH X) 8)
               (STRING-EQUAL X "_hash1957" :END1 9))
          (cn "#" (shen.process-string (SUBSEQ X 9))))
         ((AND (> (LENGTH X) 9)
               (STRING-EQUAL X "_quote1957" :END1 10))
          (cn "'" (shen.process-string (SUBSEQ X 10))))
         ((AND (> (LENGTH X) 13)
               (STRING-EQUAL X "_backquote1957" :END1 14))
          (cn "`" (shen.process-string (SUBSEQ X 14))))
         ((AND (> (LENGTH X) 7)
               (STRING-EQUAL X "bar!1957" :END1 8))
          (cn "|" (shen.process-string (SUBSEQ X 8))))
         (T (cn (pos X 0) (shen.process-string (tlstr X))))))

(DEFUN get-time (Time)
  (COND ((EQ Time 'run)
         (* 1.0 (/ (GET-INTERNAL-RUN-TIME) INTERNAL-TIME-UNITS-PER-SECOND)))
        ((EQ Time 'unix)
         (- (GET-UNIVERSAL-TIME) 2208988800))
        (T
         (ERROR "get-time does not understand the parameter ~A~%" Time))))

(DEFUN shen.double-precision (X)
  (IF (INTEGERP X) X (COERCE X 'DOUBLE-FLOAT)))

(DEFUN shen.multiply (X Y)
  (* (shen.double-precision X)
     (shen.double-precision Y)))

(DEFUN shen.add (X Y)
  (+ (shen.double-precision X)
     (shen.double-precision Y)))

(DEFUN shen.subtract (X Y)
  (- (shen.double-precision X)
     (shen.double-precision Y)))

(DEFUN shen.divide (X Y)
  (LET ((Div (/ (shen.double-precision X)
                (shen.double-precision Y))))
       (IF (INTEGERP Div)
           Div
           (* (COERCE 1.0 'DOUBLE-FLOAT) Div))))

(DEFUN shen.greater? (X Y) (IF (> X Y) 'true 'false))

(DEFUN shen.less? (X Y) (IF (< X Y) 'true 'false))

(DEFUN shen.greater-than-or-equal-to? (X Y) (IF (>= X Y) 'true 'false))

(DEFUN shen.less-than-or-equal-to? (X Y) (IF (<= X Y) 'true 'false))

(SETQ *stinput* *STANDARD-INPUT*)
(SETQ *stoutput* *STANDARD-OUTPUT*)

(DEFUN number? (N) (IF (NUMBERP N) 'true 'false))