Flo: Unterschied zwischen den Versionen

aus dem Wiki des Entropia e.V., CCC Karlsruhe
Wechseln zu: Navigation, Suche
(wo wir schonmal dabei sind)
Zeile 13: Zeile 13:
 
#!/usr/bin/env ruby
 
#!/usr/bin/env ruby
  
flo = [ "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" ]
+
flo = [ "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" ]
  
 
# flos sind keine arrayss1!
 
# flos sind keine arrayss1!
Zeile 27: Zeile 27:
 
|<pre>
 
|<pre>
 
(eval-when (:compile-toplevel :load-toplevel :execute)
 
(eval-when (:compile-toplevel :load-toplevel :execute)
   (defvar *flo-sequence* #("dividuum" "syb" "fiji" "flowhase" "florolf" "piratenflo")))
+
   (defvar *flo-sequence* #("dividuum" "syb" "fiji" "flowhase" "florolf" "FlorianJW")))
  
 
(defmacro make-individual-flo-variables ()
 
(defmacro make-individual-flo-variables ()
Zeile 51: Zeile 51:
 
#include <unistd.h>
 
#include <unistd.h>
 
const int flolen = 6;
 
const int flolen = 6;
static const char *flos[] = {"dividuum","syb","fiji","flowhase","florolf", "piratenflo"};
+
static const char *flos[] = {"dividuum","syb","fiji","flowhase","florolf", "FlorianJW"};
 
static const char *proghead = "#include <stdio.h>\nint main(void){\n";
 
static const char *proghead = "#include <stdio.h>\nint main(void){\n";
 
static const char *progend =  "  return(0);\n}\n";
 
static const char *progend =  "  return(0);\n}\n";
Zeile 74: Zeile 74:
 
#!/usr/bin/perl
 
#!/usr/bin/perl
  
@flo = ( "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" );
+
@flo = ( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );
  
 
for $i (0..$#flo) {
 
for $i (0..$#flo) {
Zeile 87: Zeile 87:
 
#!/usr/bin/perl
 
#!/usr/bin/perl
  
@flo = ( "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" );
+
@flo = ( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );
  
 
for $i (0..$#flo) {
 
for $i (0..$#flo) {
Zeile 99: Zeile 99:
 
<pre>
 
<pre>
 
<?php
 
<?php
$flo = array( "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" );
+
$flo = array( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );
  
 
foreach ($flo as $i => $x) {
 
foreach ($flo as $i => $x) {
Zeile 114: Zeile 114:
 
#!/bin/sh
 
#!/bin/sh
  
flo="dividuum syb fiji flowhase florolf piratenflo"
+
flo="dividuum syb fiji flowhase florolf FlorianJW"
  
 
n=0
 
n=0
Zeile 133: Zeile 133:
 
<pre>
 
<pre>
 
<?php
 
<?php
$flo = array( "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" );
+
$flo = array( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );
  
 
$l = fopen("flo.lisp", "w"); $p = fopen("flo.pl", "w");
 
$l = fopen("flo.lisp", "w"); $p = fopen("flo.pl", "w");
Zeile 174: Zeile 174:
 
#!/usr/bin/env ruby
 
#!/usr/bin/env ruby
  
flo = [ "dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo" ]
+
flo = [ "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" ]
  
 
# flos sind keine arrayss1!
 
# flos sind keine arrayss1!
Zeile 185: Zeile 185:
 
'cause JavaScript rocks:
 
'cause JavaScript rocks:
 
<pre>
 
<pre>
flo = new Array("dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo");
+
flo = new Array("dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW");
 
for (i in flo) {
 
for (i in flo) {
 
   eval("flo"+i+" = flo["+i+"]");
 
   eval("flo"+i+" = flo["+i+"]");
Zeile 200: Zeile 200:
 
lua_State *L;
 
lua_State *L;
  
char *flos[] = {"dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo"};
+
char *flos[] = {"dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW"};
 
char buf[1024];
 
char buf[1024];
  
Zeile 234: Zeile 234:
  
 
int main(){
 
int main(){
vector<string> flo={"dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo"};
+
vector<string> flo={"dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW"};
 
ofstream cpp_2("cpp_2.cpp");
 
ofstream cpp_2("cpp_2.cpp");
 
cpp_2<<"#include <iostream>\n#include <string> \nusing namespace std;\nint main(){\n";
 
cpp_2<<"#include <iostream>\n#include <string> \nusing namespace std;\nint main(){\n";
Zeile 318: Zeile 318:
  
 
(def-flo-class |Flo5|
 
(def-flo-class |Flo5|
     :name "piratenflo"
+
     :name "FlorianJW"
 
     :skill "pirat"
 
     :skill "pirat"
 
     :notebook "I-have-no-idea")
 
     :notebook "I-have-no-idea")
Zeile 343: Zeile 343:
 
VALUE flo_init(VALUE self)
 
VALUE flo_init(VALUE self)
 
{
 
{
         char *flo[] = {"dividuum", "syb", "fiji", "flowhase", "florolf", "piratenflo"};
+
         char *flo[] = {"dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW"};
 
         int i;
 
         int i;
  
Zeile 392: Zeile 392:
 
Stimmt doch gar nicht! Ist ganz einfach:
 
Stimmt doch gar nicht! Ist ganz einfach:
 
<pre>
 
<pre>
map printf("%s = %s\n", [flo0..flo5]->[$_], [dividuum, syb, fiji, flowhase, florolf, piratenflo]->[$_]), 0..$#{@{[flo0..flo5]}};
+
map printf("%s = %s\n", [flo0..flo5]->[$_], [dividuum, syb, fiji, flowhase, florolf, FlorianJW]->[$_]), 0..$#{@{[flo0..flo5]}};
 
</pre>
 
</pre>
 
(Kommentar von [[Benutzer:Mgr|mgr]]: Genau, "0..$#{@{[flo0..flo5]}}" ... q.e.d. Danke für das gute Beispiel.
 
(Kommentar von [[Benutzer:Mgr|mgr]]: Genau, "0..$#{@{[flo0..flo5]}}" ... q.e.d. Danke für das gute Beispiel.
Zeile 400: Zeile 400:
 
Und auch in python kann man Einzeiler schreiben:
 
Und auch in python kann man Einzeiler schreiben:
 
<pre>
 
<pre>
print "\n".join(["%s = %s" % (k, v) for k, v in {"flo0":"dividuum", "flo1":"syb", "flo2":"fiji", "flo3":"flowhase","flo4":"florolf", "flo5":"piratenflo"}.items()])
+
print "\n".join(["%s = %s" % (k, v) for k, v in {"flo0":"dividuum", "flo1":"syb", "flo2":"fiji", "flo3":"flowhase","flo4":"florolf", "flo5":"FlorianJW"}.items()])
 
</pre>
 
</pre>
  
 
[[Kategorie:Wissen]]
 
[[Kategorie:Wissen]]
 
[[Kategorie:Entropia]]
 
[[Kategorie:Entropia]]

Version vom 28. November 2012, 19:38 Uhr

Qsicon Ueberarbeiten.png 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", "florolf", "FlorianJW" ]

# 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" "florolf" "FlorianJW")))

(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 5)
    (format t "~&flo~d = ~a" i (eval (read-from-string (format nil "*flo~d*" i)))))
Lisplogo warning 128.png

Dreckiges C:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
const int flolen = 6;
static const char *flos[] = {"dividuum","syb","fiji","flowhase","florolf", "FlorianJW"};
static const char *proghead = "#include <stdio.h>\nint main(void){\n";
static const 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", "florolf", "FlorianJW" );

for $i (0..$#flo) {
  eval "\$flo$i = \$flo\[$i\]";
  print "\$flo$i eq \"" . eval("\$flo$i") . "\"\n";
}

Perl:

#!/usr/bin/perl

@flo = ( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );

for $i (0..$#flo) {
  ${"flo$i"} = $flo[$i];
  print "\$flo$i eq \"" . ${"flo$i"} . "\"\n";
}

PHP:

<?php
$flo = array( "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" );

foreach ($flo as $i => $x) {
  ${"flo$i"} = $flo[$i];
  echo "\$flo$i = \"" . ${"flo$i"} . "\"\n";
}
?>


Gute alte Bash:

#!/bin/sh

flo="dividuum syb fiji flowhase florolf FlorianJW"

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", "florolf", "FlorianJW" );

$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");
?>

Php-logo.gif Lisplogo warning 128.png Perl logo mermaid.png

Bash-org.jpg Xslt.png

Noch einmal in Ruby:

#!/usr/bin/env ruby

flo = [ "dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW" ]

# 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", "florolf", "FlorianJW");
for (i in flo) {
  eval("flo"+i+" = flo["+i+"]");
  dump("flo"+i+" == "+eval("flo"+i)+"\n");
}

Wir moegen Lua:

#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>

lua_State *L;

char *flos[] = {"dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW"};
char buf[1024];

void main() {
        char *p;
        int i;

        L = luaL_newstate();
        luaL_openlibs(L);

        for(i=0; i < 6; i++) {
                sprintf(buf, "flo%d", i);
                lua_pushstring(L, flos[i]);
                lua_setglobal(L, buf);
        }

        p=buf;
        for(i=0; i < 6; i++)
                p += sprintf(p, "print(\"flo%d = \" .. flo%d);", i, i);

        luaL_dostring(L, buf);
}

C++11:

#include <vector>
#include <string>
#include <cstdlib>
#include <fstream>

using namespace std;

int main(){
	vector<string> flo={"dividuum", "syb", "fiji", "flowhase", "florolf", "FlorianJW"};
	ofstream cpp_2("cpp_2.cpp");
	cpp_2<<"#include <iostream>\n#include <string> \nusing namespace std;\nint main(){\n";
	for(int i=0;i<flo.size();++i){
		cpp_2<<"\tstring flo"<<i<<" =\""<<flo[i]<<"\";\n";
	}
	cpp_2<<"\tcout\n";
	for(int i=0;i<flo.size();++i){
		cpp_2<<"\t\t<<flo"<<i;
		if(i+1==flo.size()){
			cpp_2<<"<<endl;\n";
		}
		else{
			cpp_2<<"<<\", \"\n";
		}
		
	}
	cpp_2<<"}"<<endl;
	cpp_2.close();
	system("g++ cpp_2.cpp -o cpp_2; ./cpp_2");
	return 0;
}

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")

(def-flo-class |Flo4|
    :name "florolf"
    :skill "konfusion"
    :notebook "Thinkpad")

(def-flo-class |Flo5|
    :name "FlorianJW"
    :skill "pirat"
    :notebook "I-have-no-idea")


(let ((flos (list (make-instance '|Flo0|)
                  (make-instance '|Flo1|)
                  (make-instance '|Flo2|)
                  (make-instance '|Flo3|)
                  (make-instance '|Flo4|)
                  (make-instance '|Flo5|))))
  (dolist (flo flos)
    (print flo)))
Lisplogo 256.png

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", "florolf", "FlorianJW"};
        int i;

        for(i = 0; i < 6; i++)
        {
                char varname[7];
                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..flo5]->[$_], [dividuum, syb, fiji, flowhase, florolf, FlorianJW]->[$_]), 0..$#{@{[flo0..flo5]}};

(Kommentar von mgr: Genau, "0..$#{@{[flo0..flo5]}}" ... 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","flo4":"florolf", "flo5":"FlorianJW"}.items()])