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Wir weisen darauf hin, dass möglicherweise nicht alle Beiträge den Anforderungen genügen. Die Anforderungen sind: Flos sind in Liste "flo" gespeichert, zur Ausführ- oder Compilierzeit werden durch den Code einzelne flo0, flo1, flo2, flo3 Variablen angelegt, die später dann auch zur Ausgabe verwendet werden. |
Wir sind die Flo, Widerstand ist zwecklos!
Beiträge, die die Anforderungen erfüllen
#!/usr/bin/env ruby
flo = [ "dividuum", "syb", "fiji", "flowhase" ]
# flos sind keine arrayss1!
for i in 0..flo.size-1
eval "flo#{i} = flo[#{i}]"
puts "flo#{i} == \"" + eval("flo#{i}") + "\""
end
Dieses Perl (*duck*) kann ja keiner lesen!1) Daher:
(eval-when (:compile-toplevel :load-toplevel :execute)
(defvar *flo-sequence* #("dividuum" "syb" "fiji" "flowhase")))
(defmacro make-individual-flo-variables ()
(cons 'progn
(loop for flo across *flo-sequence*
for i from 0
collect `(defvar ,(read-from-string (format nil "*flo~d*" i)) ,flo))))
(make-individual-flo-variables)
(dotimes (i 4)
(format t "~&flo~d = ~a" i (eval (read-from-string (format nil "*flo~d*" i)))))
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Dreckiges C:
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
const int flolen = 4;
static char *flos[] = {"dividuum","syb","fiji","flowhase"};
static char *proghead = "#include <stdio.h>\nint main(void){\n";
static char *progend = " return(0);\n}\n";
int main(void){
int i; FILE *o;
o=fopen("flo2.c","w");
fputs(proghead,o);
for(i=0;i<flolen;i++){
fprintf(o," char *flo%d = \"%s\";\n",i,flos[i]);
fprintf(o," printf(\"flo%%d ist %%s\\n\",%d,flo%d);\n",i,i); }
fputs(progend,o);
fclose(o);
system("/usr/bin/gcc -o flos flo2.c;./flos;rm -f flo2.c flos");
return(0);
}
Nu aber wirklich noch in Perl:
#!/usr/bin/perl
@flo = ( "dividuum", "syb", "fiji", "flowhase" );
for $i (0..$#flo) {
eval "\$flo$i = \$flo\[$i\]";
print "\$flo$i eq \"" . eval("\$flo$i") . "\"\n";
}
Gute alte Bash:
#!/bin/sh flo="dividuum syb fiji flowhase" n=0 for f in $flo do eval flo$n=$f echo -n "flo$n == " eval echo \$flo$n n=$(($n+1)) done
Realisiert in PHP, Lisp, Perl, XML, Bash und XSLT und immernoch kürzer als die C-Version:
<?php
$flo = array( "dividuum", "syb", "fiji", "flowhase" );
$l = fopen("flo.lisp", "w"); $p = fopen("flo.pl", "w");
fwrite($l, '(progn (format t "~a" "<flo>")');
fwrite($p,'
print <<EOF
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="http://www.w3.org/TR/xhtml1/strict">
<xsl:template match="/">');
for($i=0;$i<count($flo);$i++) {
fwrite($l, "(format t \"~a~a~a\" \"<flo$i>\" \"$flo[$i]\" \"</flo$i>\")");
fwrite($p, "flo$i == <xsl:value-of select=\"flo/flo$i\"/>\n");
}
fwrite($l, '(format t "~a" "</flo>"))');
fwrite($p,'
</xsl:template>
</xsl:stylesheet>
EOF'."\n");
fclose($l); fclose($p);
system("sbcl --noinform --load flo.lisp --eval '(quit)' > flo.xml");
system("perl flo.pl > flo.xslt");
system("xsltproc flo.xslt flo.xml | grep -v xml");
?>
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Noch einmal in Ruby:
#!/usr/bin/env ruby
flo = [ "dividuum", "syb", "fiji", "flowhase" ]
# flos sind keine arrayss1!
flo.each_with_index do | f, i |
instance_variable_set "@flo#{i}", f
puts "flo#{i} = #{instance_variable_get "@flo#{i}"}"
end
'cause JavaScript rocks:
flo = new Array("dividuum", "syb", "fiji", "flowhase");
for (i in flo) {
eval("flo"+i+" = flo["+i+"]");
dump("flo"+i+" == "+eval("flo"+i)+"\n");
}
Bloatiger Angebercode, der auch noch etwas völlig anderes macht
Und nochmal das, was das Ruby-Programm "mit viel bloatigem Metaprogramming-Foo" macht, allerdings wiederum in Common Lisp gegossen:
(Warnung: (Zumindest) als Lispprogramm ist dieses Beispiel ziemlich unsinning, und z.B. die PRINT-OBJECT-Methode widerspricht der gängigen Konvention.)
(defclass flo ()
((name :initarg :name :reader flo-name)
(skill :initarg :skill :reader flo-skill)
(notebook :initarg :notebook :reader flo-notebook)))
(defun slot-value-or-something (object &key (slot 'name) (something "without name"))
(if (slot-boundp object slot)
(slot-value object slot)
something))
(defmethod print-object ((flo flo) stream)
(format stream "~&~a is actually ~a and is good at ~a.~&He loves hacking on his ~a."
(class-name (class-of flo))
(slot-value-or-something flo)
(slot-value-or-something flo :slot 'skill :something "nothing")
(slot-value-or-something flo :slot 'notebook :something "dulcimer")))
(defmacro def-flo-class (class-name &key name skill notebook)
(macrolet ((make-slot-def (name)
`(when ,name
`(,',name :initform ,,name))))
`(defclass ,class-name (flo)
,(remove nil (list
(make-slot-def name)
(make-slot-def skill)
(make-slot-def notebook))))))
(def-flo-class |Flo0|
:name "dividuum"
:skill "DOOM"
:notebook "old Dell")
(def-flo-class |Flo1|
:name "Peter"
:skill "math"
:notebook "IBM Thinkpad")
(def-flo-class |Flo2|
:name "Fiji"
:skill "WOW"
:notebook "I-have-no-idea")
(def-flo-class |Flo3|
:name "flohase"
:skill "hoppeln"
:notebook "hasIbook")
(let ((flos (list (make-instance '|Flo0|)
(make-instance '|Flo1|)
(make-instance '|Flo2|)
(make-instance '|Flo3|))))
(dolist (flo flos)
(print flo)))
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Ru^W Objektorientiertes C
// Das aendern:
#include "/usr/local/lib/ruby/1.8/i386-freebsd5/ruby.h"
VALUE flo_init(VALUE self)
{
char *flo[] = {"dividuum", "syb", "fiji", "flowhase"};
int i;
for(i = 0; i < 4; i++)
{
char varname[6];
sprintf(varname, "@flo%i", i); // Insecure!
rb_iv_set(self, varname, rb_str_new2(flo[i]));
}
}
VALUE flo_each(VALUE self)
{
int i;
VALUE vars = rb_funcall(self, rb_intern("instance_variables"), 0);
VALUE varname = rb_ary_shift(vars);
while(varname != Qnil)
{
rb_yield(rb_ary_new3(2, varname, rb_iv_get(self, RSTRING(varname)->ptr)));
varname = rb_ary_shift(vars);
}
return(Qnil);
}
int main()
{
VALUE flo;
ruby_init();
flo = rb_define_class("Flo", rb_cObject);
rb_define_method(flo, "initialize", flo_init, 0);
rb_define_method(flo, "each", flo_each, 0);
rb_eval_string("Flo.new.each { |name,value| puts \"#{name.gsub(/^@/, '')} = #{value}\" }");
return(0);
}
Fußnoten
1) Anmerkung zu: "Dieses Perl (*duck*) kann ja keiner lesen!"
Stimmt doch gar nicht! Ist ganz einfach:
map printf("%s = %s\n", [flo0..flo3]->[$_], [dividuum, syb, fiji, flowhase]->[$_]), 0..$#{@{[flo0..flo3]}};
(Kommentar von mgr: Genau, "0..$#{@{[flo0..flo3]}}" ... q.e.d. Danke für das gute Beispiel. Aber ernsthaft, es ging hier eben gerade *nicht* um Einzeiler, die will niemand.)
Und auch in python kann man Einzeiler schreiben:
print "\n".join(["%s = %s" % (k, v) for k, v in {"flo0":"dividuum", "flo1":"syb", "flo2":"fiji", "flo3":"flowhase"}.items()])