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package Devel::StackTrace::AsHTML; |
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39326
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use strict; |
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use 5.008_001; |
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our $VERSION = '0.15'; |
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use Data::Dumper; |
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use Devel::StackTrace; |
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use Scalar::Util; |
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no warnings 'qw'; |
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my %enc = qw( & & > > < < " " ' ' ); |
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# NOTE: because we don't know which encoding $str is in, or even if |
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# $str is a wide character (decoded strings), we just leave the low |
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# bits, including latin-1 range and encode everything higher as HTML |
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# entities. I know this is NOT always correct, but should mostly work |
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# in case $str is encoded in utf-8 bytes or wide chars. This is a |
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# necessary workaround since we're rendering someone else's code which |
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# we can't enforce string encodings. |
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sub encode_html { |
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my $str = shift; |
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$str =~ s/([^\x00-\x21\x23-\x25\x28-\x3b\x3d\x3f-\xff])/$enc{$1} || '' . ord($1) . ';' /ge; |
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utf8::downgrade($str); |
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$str; |
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} |
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sub Devel::StackTrace::as_html { |
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__PACKAGE__->render(@_); |
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} |
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sub render { |
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my $class = shift; |
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my $trace = shift; |
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my %opt = @_; |
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my $msg = encode_html($trace->frame(0)->as_string(1)); |
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my $out = qq{Error: ${msg}}; |
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$opt{style} ||= \<); |
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} else { |
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$out .= qq(); |
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} |
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$out .= <
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Error trace$msg |
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HEAD |
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my $i = 0; |
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while (my $frame = $trace->next_frame) { |
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$i++; |
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my $next_frame = $trace->frame($i); # peek next |
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$out .= join( |
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'', |
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'', |
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($next_frame && $next_frame->subroutine) ? encode_html("in " . $next_frame->subroutine) : '', |
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' at ', |
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$frame->filename ? encode_html($frame->filename) : '', |
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' line ', |
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$frame->line, |
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q(),
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_build_context($frame) || '', |
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q(), |
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_build_arguments($i, $next_frame), |
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$frame->can('lexicals') ? _build_lexicals($i, $frame->lexicals) : '', |
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q(), |
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); |
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} |
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$out .= qq{}; |
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$out .= ""; |
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$out; |
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} |
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my $dumper = sub { |
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my $value = shift; |
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$value = $$value if ref $value eq 'SCALAR' or ref $value eq 'REF'; |
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my $d = Data::Dumper->new([ $value ]); |
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$d->Indent(1)->Terse(1)->Deparse(1); |
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chomp(my $dump = $d->Dump); |
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$dump; |
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}; |
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sub _build_arguments { |
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my($id, $frame) = @_; |
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my $ref = "arg-$id"; |
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return '' unless $frame && $frame->args; |
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my @args = $frame->args; |
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my $html = qq( Show function arguments );
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# Don't use while each since Dumper confuses that |
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for my $idx (0 .. @args - 1) { |
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my $value = $args[$idx]; |
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my $dump = $dumper->($value); |
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$html .= qq{ | };
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$html .= qq{ | \$_[$idx] | };
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$html .= qq{ | } . encode_html($dump) . qq{ | };
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$html .= qq{ | };
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} |
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$html .= qq( | ); |
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return $html; |
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} |
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sub _build_lexicals { |
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my($id, $lexicals) = @_; |
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my $ref = "lex-$id"; |
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return '' unless keys %$lexicals; |
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my $html = qq( Show lexical variables );
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# Don't use while each since Dumper confuses that |
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for my $var (sort keys %$lexicals) { |
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my $value = $lexicals->{$var}; |
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my $dump = $dumper->($value); |
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$dump =~ s/^\{(.*)\}$/($1)/s if $var =~ /^\%/; |
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$dump =~ s/^\[(.*)\]$/($1)/s if $var =~ /^\@/; |
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$html .= qq{ | };
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$html .= qq{ | } . encode_html($var) . qq{ | };
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$html .= qq{ | } . encode_html($dump) . qq{ | };
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$html .= qq{ | };
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} |
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$html .= qq( | ); |
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return $html; |
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} |
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174
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sub _build_context { |
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my $frame = shift; |
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my $file = $frame->filename; |
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my $linenum = $frame->line; |
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my $code; |
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if (-f $file) { |
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my $start = $linenum - 3; |
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my $end = $linenum + 3; |
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$start = $start < 1 ? 1 : $start; |
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open my $fh, '<', $file |
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or die "cannot open $file:$!"; |
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my $cur_line = 0; |
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48
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while (my $line = <$fh>) { |
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++$cur_line; |
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last if $cur_line > $end; |
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next if $cur_line < $start; |
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$line =~ s|\t| |g; |
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100
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my @tag = $cur_line == $linenum |
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? (q{}, '') |
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: ('', ''); |
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$code .= sprintf( |
195
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'%s%5d: %s%s', $tag[0], $cur_line, encode_html($line), |
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$tag[1], |
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); |
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} |
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close $file; |
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} |
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return $code; |
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} |
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1; |
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__END__ |