html.pm

UNIX下perl实现代码

                        $linktext .= "the $page manpage" if $page;
                    }
                    ###  print STDERR "got coderef url=$url\n";
                    last RESOLVE;
                }
                ## no luck: go for a section (auto-quoting!)
                $section = $ident;
            }
            ## now go for a section
            my $htmlsection = htmlify( $section );
 	    $url = page_sect( $page, $htmlsection );
            if( $url ){
                if( ! defined( $linktext ) ){
                    $linktext = $section;
                    $linktext .= " in " if $section && $page;
                    $linktext .= "the $page manpage" if $page;
                }
                ### print STDERR "got page/section url=$url\n";
                last RESOLVE;
            }
            ## no luck: go for an ident 
            if( $section ){
                $ident = $section;
            } else {
                $ident = $page;
                $page  = undef();
            }
            ( $url, $fid ) = coderef( $page, $ident );
            if( $url ){
                if( ! defined( $linktext ) ){
                    $linktext = $ident;
                    $linktext .= " in " if $ident && $page;
                    $linktext .= "the $page manpage" if $page;
                }
                ### print STDERR "got section=>coderef url=$url\n";
                last RESOLVE;
            }

            # warning; show some text.
            $linktext = $opar unless defined $linktext;
            warn "$0: $podfile: cannot resolve L<$opar> in paragraph $paragraph.";
        }

        # now we have an URL or just plain code
        $$rstr = $linktext . '>' . $$rstr;
        if( defined( $url ) ){
            $res = "<A HREF=\"$url\">" . process_text1( $lev, $rstr ) . '</A>';
        } else {
	    $res = '<EM>' . process_text1( $lev, $rstr ) . '</EM>';
        }

    } elsif( $func eq 'S' ){
	# S<text> - non-breaking spaces
	$res = process_text1( $lev, $rstr );
	$res =~ s/ /&nbsp;/g;

    } elsif( $func eq 'X' ){
	# X<> - ignore
	$$rstr =~ s/^[^>]*>//;

    } elsif( $func eq 'Z' ){
	# Z<> - empty 
	warn "$0: $podfile: invalid X<> in paragraph $paragraph."
	    unless $$rstr =~ s/^>//;

    } else {
        my $term = pattern $closing;
	while( $$rstr =~ s/\A(.*?)(([BCEFILSXZ])<(<+[^\S\n]+)?|$term)//s ){
	    # all others: either recurse into new function or
	    # terminate at closing angle bracket(s)
	    my $pt = $1;
            $pt .= $2 if !$3 &&  $lev == 1;
	    $res .= $lev == 1 ? pure_text( $pt ) : inIS_text( $pt );
	    return $res if !$3 && $lev > 1;
            if( $3 ){
		$res .= process_text1( $lev, $rstr, $3, closing $4 );
 	    }
	}
	if( $lev == 1 ){
	    $res .= pure_text( $$rstr );
	} else {
	    warn "$0: $podfile: undelimited $func<> in paragraph $paragraph.";
	}
    }
    return $res;
}

#
# go_ahead: extract text of an IS (can be nested)
#
sub go_ahead($$$){
    my( $rstr, $func, $closing ) = @_;
    my $res = '';
    my @closing = ($closing);
    while( $$rstr =~
      s/\A(.*?)(([BCEFILSXZ])<(<+[^\S\n]+)?|@{[pattern $closing[0]]})//s ){
	$res .= $1;
	unless( $3 ){
	    shift @closing;
	    return $res unless @closing;
	} else {
	    unshift @closing, closing $4;
	}
	$res .= $2;
    }
    warn "$0: $podfile: undelimited $func<> in paragraph $paragraph.";
    return $res;
}

#
# emit_C - output result of C<text>
#    $text is the depod-ed text
#
sub emit_C($;$$){
    my( $text, $nocode, $args ) = @_;
    $args = '' unless defined $args;
    my $res;
    my( $url, $fid ) = coderef( undef(), $text );

    # need HTML-safe text
    my $linktext = html_escape( "$text$args" );

    if( defined( $url ) &&
        (!defined( $EmittedItem ) || $EmittedItem ne $fid ) ){
	$res = "<A HREF=\"$url\"><CODE>$linktext</CODE></A>";
    } elsif( 0 && $nocode ){
	$res = $linktext;
    } else {
	$res = "<CODE>$linktext</CODE>";
    }
    return $res;
}

#
# html_escape: make text safe for HTML
#
sub html_escape {
    my $rest = $_[0];
    $rest   =~ s/&/&amp;/g;
    $rest   =~ s/</&lt;/g;
    $rest   =~ s/>/&gt;/g;
    $rest   =~ s/"/&quot;/g;
    return $rest;
} 


#
# dosify - convert filenames to 8.3
#
sub dosify {
    my($str) = @_;
    return lc($str) if $^O eq 'VMS';     # VMS just needs casing
    if ($Is83) {
        $str = lc $str;
        $str =~ s/(\.\w+)/substr ($1,0,4)/ge;
        $str =~ s/(\w+)/substr ($1,0,8)/ge;
    }
    return $str;
}

#
# page_sect - make an URL from the text of a L<>
#
sub page_sect($$) {
    my( $page, $section ) = @_;
    my( $linktext, $page83, $link);	# work strings

    # check if we know that this is a section in this page
    if (!defined $pages{$page} && defined $sections{$page}) {
	$section = $page;
	$page = "";
        ### print STDERR "reset page='', section=$section\n";
    }

    $page83=dosify($page);
    $page=$page83 if (defined $pages{$page83});
    if ($page eq "") {
	$link = "#" . htmlify( $section );
    } elsif ( $page =~ /::/ ) {
	$page =~ s,::,/,g;
	# Search page cache for an entry keyed under the html page name,
	# then look to see what directory that page might be in.  NOTE:
	# this will only find one page. A better solution might be to produce
	# an intermediate page that is an index to all such pages.
	my $page_name = $page ;
	$page_name =~ s,^.*/,,s ;
	if ( defined( $pages{ $page_name } ) && 
	     $pages{ $page_name } =~ /([^:]*$page)\.(?:pod|pm):/ 
	   ) {
	    $page = $1 ;
	}
	else {
	    # NOTE: This branch assumes that all A::B pages are located in
	    # $htmlroot/A/B.html . This is often incorrect, since they are
	    # often in $htmlroot/lib/A/B.html or such like. Perhaps we could
	    # analyze the contents of %pages and figure out where any
	    # cousins of A::B are, then assume that.  So, if A::B isn't found,
	    # but A::C is found in lib/A/C.pm, then A::B is assumed to be in
	    # lib/A/B.pm. This is also limited, but it's an improvement.
	    # Maybe a hints file so that the links point to the correct places
	    # nonetheless?

	}
	$link = "$htmlroot/$page.html";
	$link .= "#" . htmlify( $section ) if ($section);
    } elsif (!defined $pages{$page}) {
	$link = "";
    } else {
	$section = htmlify( $section ) if $section ne "";
        ### print STDERR "...section=$section\n";

	# if there is a directory by the name of the page, then assume that an
	# appropriate section will exist in the subdirectory
#	if ($section ne "" && $pages{$page} =~ /([^:]*[^(\.pod|\.pm)]):/) {
	if ($section ne "" && $pages{$page} =~ /([^:]*(?<!\.pod)(?<!\.pm)):/) {
	    $link = "$htmlroot/$1/$section.html";
            ### print STDERR "...link=$link\n";

	# since there is no directory by the name of the page, the section will
	# have to exist within a .html of the same name.  thus, make sure there
	# is a .pod or .pm that might become that .html
	} else {
	    $section = "#$section" if $section;
            ### print STDERR "...section=$section\n";

	    # check if there is a .pod with the page name
	    if ($pages{$page} =~ /([^:]*)\.pod:/) {
		$link = "$htmlroot/$1.html$section";
	    } elsif ($pages{$page} =~ /([^:]*)\.pm:/) {
		$link = "$htmlroot/$1.html$section";
	    } else {
		$link = "";
	    }
	}
    }

    if ($link) {
	# Here, we take advantage of the knowledge that $htmlfileurl ne ''
	# implies $htmlroot eq ''. This means that the link in question
	# needs a prefix of $htmldir if it begins with '/'. The test for
	# the initial '/' is done to avoid '#'-only links, and to allow
	# for other kinds of links, like file:, ftp:, etc.
        my $url ;
        if (  $htmlfileurl ne '' ) {
            $link = "$htmldir$link" if $link =~ m{^/}s;
            $url = relativize_url( $link, $htmlfileurl );
# print( "  b: [$link,$htmlfileurl,$url]\n" );
	}
	else {
            $url = $link ;
	}
	return $url;

    } else {
	return undef();
    }
}

#
# relativize_url - convert an absolute URL to one relative to a base URL.
# Assumes both end in a filename.
#
sub relativize_url {
    my ($dest,$source) = @_ ;

    my ($dest_volume,$dest_directory,$dest_file) = 
        File::Spec::Unix->splitpath( $dest ) ;
    $dest = File::Spec::Unix->catpath( $dest_volume, $dest_directory, '' ) ;

    my ($source_volume,$source_directory,$source_file) = 
        File::Spec::Unix->splitpath( $source ) ;
    $source = File::Spec::Unix->catpath( $source_volume, $source_directory, '' ) ;

    my $rel_path = '' ;
    if ( $dest ne '' ) {
       $rel_path = File::Spec::Unix->abs2rel( $dest, $source ) ;
    }

    if ( $rel_path ne ''                && 
         substr( $rel_path, -1 ) ne '/' &&
         substr( $dest_file, 0, 1 ) ne '#' 
        ) {
        $rel_path .= "/$dest_file" ;
    }
    else {
        $rel_path .= "$dest_file" ;
    }

    return $rel_path ;
}


#
# coderef - make URL from the text of a C<>
#
sub coderef($$){
    my( $page, $item ) = @_;
    my( $url );

    my $fid = fragment_id( $item );
    if( defined( $page ) ){
	# we have been given a $page...
	$page =~ s{::}{/}g;

	# Do we take it? Item could be a section!
	my $base = $items{$fid} || "";
	$base =~ s{[^/]*/}{};
	if( $base ne "$page.html" ){
            ###   print STDERR "coderef( $page, $item ): items{$fid} = $items{$fid} = $base => discard page!\n";
	    $page = undef();
	}

    } else {
        # no page - local items precede cached items
	if( defined( $fid ) ){
	    if(  exists $local_items{$fid} ){
		$page = $local_items{$fid};
	    } else {
		$page = $items{$fid};
	    }
	}
    }

    # if there was a pod file that we found earlier with an appropriate
    # =item directive, then create a link to that page.
    if( defined $page ){
	if( $page ){
            if( exists $pages{$page} and $pages{$page} =~ /([^:.]*)\.[^:]*:/){
		$page = $1 . '.html';
	    }
	    my $link = "$htmlroot/$page#item_$fid";

	    # Here, we take advantage of the knowledge that $htmlfileurl
	    # ne '' implies $htmlroot eq ''.
	    if (  $htmlfileurl ne '' ) {
		$link = "$htmldir$link" ;
		$url = relativize_url( $link, $htmlfileurl ) ;
	    } else {
		$url = $link ;
	    }
	} else {
	    $url = "#item_" . $fid;
	}

	confess "url has space: $url" if $url =~ /"[^"]*\s[^"]*"/;
    }       
    return( $url, $fid );
}



#
# Adapted from Nick Ing-Simmons' PodToHtml package.
sub relative_url {
    my $source_file = shift ;
    my $destination_file = shift;

    my $source = URI::file->new_abs($source_file);
    my $uo = URI::file->new($destination_file,$source)->abs;
    return $uo->rel->as_string;
}


#
# finish_list - finish off any pending HTML lists.  this should be called
# after the entire pod file has been read and converted.
#
sub finish_list {
    while ($listlevel > 0) {
	print HTML "</DL>\n";
	$listlevel--;
    }
}

#
# htmlify - converts a pod section specification to a suitable section
# specification for HTML. Note that we keep spaces and special characters
# except ", ? (Netscape problem) and the hyphen (writer's problem...).
#
sub htmlify {
    my( $heading) = @_;
    $heading =~ s/(\s+)/ /g;
    $heading =~ s/\s+\Z//;
    $heading =~ s/\A\s+//;
    # The hyphen is a disgrace to the English language.
    $heading =~ s/[-"?]//g;
    $heading = lc( $heading );
    return $heading;
}

#
# depod - convert text by eliminating all interior sequences
# Note: can be called with copy or modify semantics
#
my %E2c;
$E2c{lt}     = '<';
$E2c{gt}     = '>';
$E2c{sol}    = '/';
$E2c{verbar} = '|';
$E2c{amp}    = '&'; # in Tk's pods

sub depod1($;$$);

sub depod($){
    my $string;
    if( ref( $_[0] ) ){
	$string =  ${$_[0]};
        ${$_[0]} = depod1( \$string );
    } else {
	$string =  $_[0];
        depod1( \$string );
    }    
}

sub depod1($;$$){
  my( $rstr, $func, $closing ) = @_;
  my $res = '';
  return $res unless defined $$rstr;
  if( ! defined( $func ) ){
      # skip to next begin of an interior sequence
      while( $$rstr =~ s/\A(.*?)([BCEFILSXZ])<(<+[^\S\n]+)?// ){
         # recurse into its text
	  $res .= $1 . depod1( $rstr, $2, closing $3);
      }
      $res .= $$rstr;
  } elsif( $func eq 'E' ){
      # E<x> - convert to character
      $$rstr =~ s/^([^>]*)>//;
      $res .= $E2c{$1} || "";
  } elsif( $func eq 'X' ){
      # X<> - ignore
      $$rstr =~ s/^[^>]*>//;
  } elsif( $func eq 'Z' ){
      # Z<> - empty 
      $$rstr =~ s/^>//;
  } else {
      # all others: either recurse into new function or
      # terminate at closing angle bracket
      my $term = pattern $closing;
      while( $$rstr =~ s/\A(.*?)(([BCEFILSXZ])<(<+[^\S\n]+)?|$term)// ){
	  $res .= $1;
	  last unless $3;
          $res .= depod1( $rstr, $3, closing $4 );
      }
      ## If we're here and $2 ne '>': undelimited interior sequence.
      ## Ignored, as this is called without proper indication of where we are.
      ## Rely on process_text to produce diagnostics.
  }
  return $res;
}

#
# fragment_id - construct a fragment identifier from:
#   a) =item text
#   b) contents of C<...>
#
my @hc;
sub fragment_id {
    my $text = shift();
    $text =~ s/\s+\Z//s;
    if( $text ){
	# a method or function?
	return $1 if $text =~ /(\w+)\s*\(/;
	return $1 if $text =~ /->\s*(\w+)\s*\(?/;

	# a variable name?
	return $1 if $text =~ /^([$@%*]\S+)/;

	# some pattern matching operator?
	return $1 if $text =~ m|^(\w+/).*/\w*$|;

	# fancy stuff... like "do { }"
	return $1 if $text =~ m|^(\w+)\s*{.*}$|;

	# honour the perlfunc manpage: func [PAR[,[ ]PAR]...]
	# and some funnies with ... Module ...
	return $1 if $text =~ m{^([a-z\d]+)(\s+[A-Z\d,/& ]+)?$};
	return $1 if $text =~ m{^([a-z\d]+)\s+Module(\s+[A-Z\d,/& ]+)?$};

	# text? normalize!
	$text =~ s/\s+/_/sg;
	$text =~ s{(\W)}{
         defined( $hc[ord($1)] ) ? $hc[ord($1)]
                 : ( $hc[ord($1)] = sprintf( "%%%02X", ord($1) ) ) }gxe;
        $text = substr( $text, 0, 50 );
    } else {
	return undef();
    }
}

#
# make_URL_href - generate HTML href from URL
# Special treatment for CGI queries.
#
sub make_URL_href($){
    my( $url ) = @_;
    if( $url !~ 
        s{^(http:[-\w/#~:.+=&%@!]+)(\?.*)$}{<A HREF="$1$2">$1</A>}i ){
        $url = "<A HREF=\"$url\">$url</A>";
    }
    return $url;
}

1;