/ /gs;
+# $string=~s/\s/ /gs;
+ $string=&HTML::Entities::decode($string);
+ return &converted(\$string);
+}
+
+sub smiley {
+ my $expression=shift;
+ if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
+ my %smileys=('\:\-\)' => 'smiley',
+ '8\-\)' => 'coolsmile',
+ '8\-(I|\|)' => 'coolindiff',
+ ':\-(I|\|)' => 'neutral',
+ '\:\-(o|O|\(\))' => 'shocked',
+ ':\-\(' => 'frowny',
+ '\;\-\)' => 'wink',
+ '\:\-P' => 'baeh',
+ '\:\-(\\\|\\/)' => 'hrrm',
+ '\:\-D' => 'bigsmile',
+ '\:\-C' => 'angry',
+ '\:(\'|\`)\-\(' => 'cry',
+ '\:\-(X|\#)' => 'lipsrsealed',
+ '\:\-S' => 'huh');
+ my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
+ foreach (keys %smileys) {
+ $expression=~s/$_/\
/gs;
+ }
+ return $expression;
+}
+
+sub msgtexconverted {
+ my ($message,$email) = @_;
+ $errorstring='';
+ &init_tth();
+ my $outmessage='';
+ my $tex=0;
+ foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
+ if ($tex) {
+ if ($email) {
+ $outmessage.=''.&to_convert($_).''; $tex=0;
+ } else {
+ $outmessage.=&to_convert($_); $tex=0;
+ }
+ } else {
+ $outmessage.=&smiley($_); $tex=1;
+ }
+ }
+ $message=$outmessage; $outmessage=''; $tex=0;
+ foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
+ if ($tex) {
+ if ($email) {
+ $outmessage.=''.&algebra($_,'web').''; $tex=0;
+ } else {
+ $outmessage.=&algebra($_,'web'); $tex=0;
+ }
+ } else {
+ $outmessage.=$_; $tex=1;
+ }
+ }
+ if (wantarray) {
+ return ($outmessage,$errorstring);
+ } else {
+ return $outmessage.$errorstring;
+ }
+}
+
+sub algebra {
+ use AlgParser;
+
+ my ($string,$target,$style)=@_;
+ my $parser = new AlgParserWithImplicitExpand;
+ $string=&prepare_algebra($string);
+ my $ret = $parser->parse($string);
+ my $result='['.&mt('Algebra unconverted due to previous errors').']';
+ if ( ref($ret) ) {
+ #$parser->tostring();
+ $parser->normalize();
+ my $latex=$parser->tolatex();
+ $latex=&postprocess_algebra($latex);
+ if ($style eq 'display') {
+ $latex='$$'.$latex.'$$x';
+ } else {
+ # style is 'inline'
+ $latex='\\ensuremath{'.$latex.'}';
+ }
+ if ($target eq 'web' || $target eq 'analyze') {
+ $result = &converted(\$latex);
+ } else {
+ $result = $latex;
+ }
+ } else {
+ &Apache::lonxml::error($parser->{'htmlerror'});
+ }
+}
+
+sub prepare_algebra {
+ my ($string)=@_;
+
+ # makes the decision about what is a minus sign easier supposedly
+ $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
+
+ return $string;
+}
+
+sub postprocess_algebra {
+ my ($string)=@_;
+
+ # moodle had these and I don't know why, ignoring them for now
+ # $string =~s/\\fun/ /g;
+
+ # remove the extra () in the denominator of a \frac
+ $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
+
+ # sqrt(3,4) means the 4 root of 3
+ $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
+
+ # log(3,4) means the log base 4 of 3
+ $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
+
+ # log(3,4) means the log base 4 of 3
+ $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
+
+ # int(3,a,b) integral from a to b of 3
+ $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
+
+ # int( ... dx) -> ...
+ $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
+
+ #
+ $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
+ return $string;
+}
1;
__END__
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