2022-08-04 14:00:11 -04:00
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<title>GScheme</title>
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2022-08-05 07:02:50 -04:00
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<body text="#000000" bgcolor="#CCCCCC" link="#0000FF" vlink="#000000">
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2022-08-04 14:00:11 -04:00
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<H1> GScheme </H1>
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2022-08-05 07:02:50 -04:00
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A GNUstep-aware scheme interpreter.
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Includes many examples, e.g. the sieve of Erathostenes to compute primes, a
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Koch curve plotter, mandelbrot set, graphs of various functions etc. GScheme
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is fully tail recursive. The garbage collector bypasses GNUstep's
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retain/release mechanism in order to deal with circular data structures. <P>
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GScheme is document-based and you can edit more than one file at the
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same time. <P>
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Speed leaves something to be desired as there is a lot of overhead due
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to Objective C.<P>
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Press Ctrl-Return in the interpreter window to evaluate the last form
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that you have entered. This will copy the form to the paste board, so that you
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may re-enter it by pressing Alt-V.
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<P>
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<IMG SRC=GScheme.png>
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<P>
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2022-08-05 07:02:12 -04:00
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Download it
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<A HREF="//files.scheme.org/GScheme-20060213.tar">
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here (TAR)</A>.
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<HR>
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Special forms implemented include
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<UL>
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<LI> define, set!, lambda,
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<LI> if, and, or
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<LI> begin, apply,
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<LI> quote, case, cond,
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<LI> let, let, letrec,
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<LI> call-with-current-continuation
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</UL>
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Primitives implemented include
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<UL>
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<LI> +, *, -, /, =, >, <,
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<LI> draw-move, draw-line, draw-color,
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<LI> sin, cos, sqrt,
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<LI> quotient, remainder, not,
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<LI> zero?, pair?, number?, eqv?, eq?,
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<LI> cons, car, cdr, list, null?,
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<LI> set-car!, set-cdr!,
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<LI> display, newline
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</UL>
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There is a library of additional primitives that are loaded on start-up.
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<HR>
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New! As of July 23, 2002:
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<UL>
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<LI> make-vector, vector?, list->vector, vector->list?
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<LI> vector-length, vector-ref, vector-set! and vector-fill!.
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<LI> asin, acos
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</UL>
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Examples now include queens.scm, which solves the classic problem and
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takes symmetries into account.
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<HR>
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New! As of July 31, 2002:
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<UL>
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<LI> memory management completely reworked
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<LI> browse-environment pops up a window that shows the current
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environment (e.g. for environment diagrams); browse.scm shows how
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</UL>
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<HR>
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New! As of January 10, 2005:
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<UL>
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<LI> memory management simplified
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<LI> new UI for browse-environment
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<LI> additional primitives: exp, log, tan, atan
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<LI> evaluate external files
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<LI> more intutive UI e.g. the last form entered is copied to the paste board
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and may be repeated by pressing Alt-V
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<LI> better error handling
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</UL>
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<PRE>
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Important: older GNUstep installations may need to replace
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#include <GNUstepBase/GSIMap.h>
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by
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#include <base/GSIMap.h>
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at the very beginning of SchemeTypes.m.
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</PRE>
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<HR>
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New! As of February 17, 2005:
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<P>
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New primitives:
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<UL>
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<LI> draw-show produces an image window with the data that have
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accumulated and resets the image
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<LI> draw-circle draws a circle of a given radius at the current position
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without changing the position
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<LI> fill-circle is like draw-circle, but fills the circle
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<LI> random outputs a random integer in the interval [0, n) when invoked
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with an integer "n" and a random double in the interval [0, v) when
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invoked with a double "v"
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</UL>
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<HR>
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New! As of February 25, 2005:
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<P>
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New primitives, graphical ones come first.
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<UL>
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<LI> string-size returns a pair containing the width and height of the
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string in the current font
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<LI> draw-font sets the current font to a font of a given size
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<LI> draw-string draws a string at the current position and advances the
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position to just behind the newly drawn string.
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</UL>
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There is a demo in "text.scm." You will probably have to change the
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font names in the demo to reflect the fonts that you have on your
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system e.g. as displayed in the font panel of Ink.app.
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Additional primitives:
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<UL>
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<LI> string->symbol
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<LI> symbol->string
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<LI> integer->char
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<LI> char->integer
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<LI> string-ref
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<LI> list->string
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<LI> string->list
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<LI> make-string
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<LI> string-append
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<LI> number->string (works for integers in bases between 2 and 36 and decimal floats).
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</UL>
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<HR>
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New! As of Mar 2, 2005:
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<P>
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New primitives:
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<UL>
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<LI> eval
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<LI> string-length
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<LI> draw-rect: draws a rectangle of the given width and height at the
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current position
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<LI> fill-rect: fills the rectangle with the current color.
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<LI> format: format a string using the ~a escape etc.
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</UL>
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<HR>
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<A HREF=mailto:markoriedelde@yahoo.de>
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markoriedelde@yahoo.de
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</A>
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</body>
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2022-08-05 07:02:50 -04:00
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</html>
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