--- loncom/homework/lonmaxima.pm	2006/12/11 17:37:43	1.6
+++ loncom/homework/lonmaxima.pm	2007/05/29 20:56:39	1.15
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Interface routines to MAXIMA CAS
 #
-# $Id: lonmaxima.pm,v 1.6 2006/12/11 17:37:43 www Exp $
+# $Id: lonmaxima.pm,v 1.15 2007/05/29 20:56:39 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,6 +31,7 @@ package Apache::lonmaxima;
 use strict;
 use IO::Socket;
 use Apache::lonnet;
+use Apache::response();
 use LONCAPA;
 
 sub connect {
@@ -59,7 +60,9 @@ sub maximareply {
 
 sub blacklisted {
     my ($cmd)=@_;
-    foreach my $forbidden ('save','load','plot','lisp','includ','compil','file','batch','stringout','translat','stout','stin','block','system') {
+    foreach my $forbidden ('save','load','plot','lisp','includ','compil',
+			   'file','batch','stringout','translat','stout',
+			   'stin','block','system','concat') {
 	if ($cmd=~/$forbidden/s) { return 1; }
     } 
     return 0;
@@ -68,24 +71,54 @@ sub blacklisted {
 sub runscript {
     my ($socket,$fullscript)=@_;
     if (&blacklisted($fullscript)) { return 'Error: blacklisted'; }
-    return &maximareply($socket,$fullscript);
+    my $reply;
+    $fullscript=~s/[\n\r\l]//gs;
+    foreach my $line (split(/\;/s,$fullscript)) {
+	if ($line=~/\w/) { $reply=&maximareply($socket,$line.";\n"); }
+	if ($reply=~/^Error\:/) { return $reply; }
+    }
+    $reply=~s/^\s*//gs;
+    $reply=~s/\s*$//gs;
+    &Apache::lonxml::debug("maxima $fullscript \n reply $reply");
+    return $reply;
+}
+
+sub maxima_cas_formula_fix {
+   my ($expression)=@_;
+   return &Apache::response::implicit_multiplication($expression);
 }
 
 sub maxima_run {
-    my ($script,$submission,$arguments) = @_;
+    my ($script,$submission,$argument) = @_;
     my $socket=&connect();
-    my $fullscript=$script;
-    my $reply=&runscript($socket,$fullscript);
-#    &Apache::lonnet::logthis('Script:'.$fullscript);
-#    &Apache::lonnet::logthis('Sub:'.$submission);
-#    &Apache::lonnet::logthis('Arg:'.$arguments);
-
+    my @submissionarray=split(/\s*\,\s*/,$submission);
+    for (my $i=0;$i<=$#submissionarray;$i++) {
+        my $n=$i+1;
+        my $fixedsubmission=&maxima_cas_formula_fix($submissionarray[$i]);
+        $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs;
+    }
+    my @argumentarray=@{$argument};
+    for (my $i=0;$i<=$#argumentarray;$i++) {
+        my $n=$i+1;
+        my $fixedargument=&maxima_cas_formula_fix($argumentarray[$i]);
+        $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs;
+    }
+    my $reply=&runscript($socket,$script);
     &disconnect($socket);
-    if ($reply=~/^\s*true\s*$/) { return 'EXACT_ANS'; }
-    if ($reply=~/^\s*false\s*/) { return 'INCORRECT'; } 
+    if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; }
+    if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; } 
     return 'BAD_FORMULA';
 }
 
+sub maxima_eval {
+    my ($script) = @_;
+    my $socket=&connect();
+    my $reply=&runscript($socket,$script);
+    &disconnect($socket);
+    return $reply;
+}
+
+
 sub compareterms {
     my ($socket,$terma,$termb)=@_;
     my $difference=$terma.'-'.$termb;