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454 lines
14 KiB
Perl
454 lines
14 KiB
Perl
#!/usr/bonsaitools/bin/perl
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# $Id: Local.pm,v 1.7 2001/07/16 20:15:03 timeless%mac.com Exp $
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# Local.pm -- Subroutines that need to be customized for each installation
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#
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# Dawn Endico <endico@mozilla.org>
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#
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######################################################################
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# This package is for placing subroutines that are likely to need
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# to be customized for each installation. In particular, the file
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# and directory description snarfing mechanism is likely to be
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# different for each project.
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package Local;
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require Exporter;
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@ISA = qw(Exporter);
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@EXPORT = qw(&fdescexpand &descexpand &dirdesc &convertwhitespace );
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use lib 'lib/';
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use LXR::Common;
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# dme: Create descriptions for a file in a directory listing
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# If no description, return the string "\ \;" to keep the
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# table looking pretty.
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#
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# In mozilla search the beginning of a source file for a short
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# description. Not all files have them and the ones that do use
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# many different formats. Try to find as many of these without
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# printing gobbledygook or something silly like a file name or a date.
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#
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# Read in the beginning of the file into a string. I chose 60 because the
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# Berkeley copyright notice is around 40 lines long so we need a bit more
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# than this.
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#
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# Its common for file descriptions to be delimited by the file name or
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# the word "Description" which precedes the description. Search the entire
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# string for these. Sometimes they're put in odd places such as inside
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# the copyright notice or after the code begins. The file name should be
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# followed by a colon or some pattern of dashes.
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#
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# If no such description is found then use the contents of the "first"
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# comment as the description. First, strip off the copyright notice plus
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# anything before it. Remove rcs comments. Search for the first bit of
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# code (usually #include) and remove it plus anything after it. In what's
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# left, find the contents of the first comment, and get the first paragraph.
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# If that's too long, use only the first sentence up to a period. If that's
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# still too long then we probably have a list or something that will look
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# strange if we print it out so give up and return null.
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#
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# Yes, this is a lot of trouble to go through but its easier than getting
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# people to use the same format and re-writing thousands of comments. Not
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# everything printed will really be a summary of the file, but still the
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# signal/noise ratio seems pretty high.
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#
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# Yea, though I walk through the valley of the shadow of pattern
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# matching, I shall fear no regex.
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sub fdescexpand {
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# use global vars here because the expandtemplate subroutine makes
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# passing parameters impossible. Use $filename from source and
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# $Path from Common.pm
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my $filename = $main::filename;
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my $linecount=0;
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my $copy= "";
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local $desc= "";
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my $maxlines = 40; #only look at the beginning of the file
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#ignore files that aren't source code
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if (!(
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($filename =~ /\.c$/) |
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($filename =~ /\.h$/) |
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($filename =~ /\.cc$/) |
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($filename =~ /\.cp$/) |
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($filename =~ /\.cpp$/) |
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($filename =~ /\.idl$/) |
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($filename =~ /\.java$/)
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)){
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return("\ \;");
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}
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if (open(FILE, $Path->{'real'}."/".$filename)) {
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while(<FILE>){
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$desc = $desc . $_ ;
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if($linecount++ > 60) {
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last;
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}
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}
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close(FILE);
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}
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# sanity check: if there's no description then stop
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if (!($desc =~ /\w/)){
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return("\ \;");;
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}
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# save a copy for later
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$copy = $desc;
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# Look for well behaved <filename><separator> formatted
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# descriptions before we go to the trouble of looking for
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# one in the first comment. The whitespace between the
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# delimiter and the description may include a newline.
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if (($desc =~ s/(?:.*?$filename\s*?- ?-*\s*)([^\n]*)(?:.*)/$1/sgi) ||
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($desc =~ s/(?:.*?$filename\s*?:\s*)([^\n]*)(?:.*)/$1/sgi) ||
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($desc =~ s/(?:.*?Description:\s*)([^\n]*)(?:.*)/$1/sgi)
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){
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# if the description is non-empty then clean it up and return it
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if ($desc =~ /\w/) {
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#strip trailing asterisks and "*/"
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$desc =~ s#\*/?\s*$##;
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$desc =~ s#^[^\S]*\**[^\S]*#\n#gs;
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# Strip beginning and trailing whitespace
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$desc =~ s/^\s+//;
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$desc =~ s/\s+$//;
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# Strip junk from the beginning
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$desc =~ s#[^\w]*##ms;
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#htmlify the comments making links to symbols and files
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$desc = markupstring($desc, $Path->{'virt'});
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return($desc);
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}
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}
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# we didn't find any well behaved descriptions above so start over
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# and look for one in the first comment
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$desc = $copy;
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# Strip off code from the end, starting at the first cpp directive
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$desc =~ s/\n#.*//s;
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# Strip off code from the end, starting at typedef
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$desc =~ s/\ntypedef.*//s;
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# Strip off license
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$desc =~ s#(?:/\*.*license.*?\*/)(.*)#$1#is;
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# Strip off copyright notice
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$desc =~ s#(?:/\*.*copyright.*?\*/)(.*)#$1#is;
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# Strip off emacs line
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$desc =~ s#(/\*.*tab-width.*?\*/)(.*)#$2#isg;
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# excise rcs crud
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$desc =~ s#Id: $filename.*?Exp \$##g;
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# Yuck, nuke these silly comments in js/jsj /* ** */
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$desc =~ s#\n\s*/\*+[\s\*]+\*/\n#\n#sg;
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# Don't bother to continue if there aren't any comments here
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if(!($desc =~ m#/\*#)) {
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return(" ");
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}
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# Remove lines generated by jmc
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$desc =~ s#\n.*?Source date:.*\n#\n#;
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$desc =~ s#\n.*?Generated by jmc.*\n#\n#;
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# Extract the first comment
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$desc =~ s#(?:.*?/\*+)(.*?)(?:(?:\*+/.*)|(?:$))#$1#s;
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# Strip silly borders
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$desc =~ s#\n\s*[\*\=\-\s]+#\n#sg;
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# Strip beginning and trailing whitespace
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$desc =~ s/^\s+//;
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$desc =~ s/\s+$//;
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# Strip out file name
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$desc =~ s#$filename##i;
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# Strip By line
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$desc =~ s#By [^\n]*##;
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# Strip out dates
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$desc =~ s#\d{1,2}/\d{1,2}/\d\d\d\d##;
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$desc =~ s#\d{1,2}/\d{1,2}/\d\d##;
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$desc =~ s#\d{1,2} \w\w\w \d\d\d\d##;
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# Strip junk from the beginning
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$desc =~ s#[^\w]*##;
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# Extract the first paragraph
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$desc =~ s#(\n\s*?\n.*)##s;
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# If the description is too long then just use the first sentence
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# this will fail if no period was used.
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if (length($desc) > 200 ) {
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$desc =~ s#([^\.]+\.)\s.*#$1#s;
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}
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# If the description is still too long then assume it will look
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# like gobbledygook and give up
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if (length($desc) > 200 ) {
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return(" ");
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}
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# htmlify the comments, making links to symbols and files
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$desc = markupstring($desc, $Path->{'virt'});
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if ($desc) {
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return($desc);
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}else{
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return("\ \;");
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}
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}
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# dme: create a short description for a subdirectory in a directory listing
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# If no description, return the string "\ \;" to keep the
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# table looking pretty.
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#
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# In Mozilla, if the directory has a README file look in it for lines
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# like the ones used in source code: "directoryname --- A short description"
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sub descexpand {
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# use global vars here because the expandtemplate subroutine makes
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# passing parameters impossible. Use $filename from source and
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# $Path from Common.pm
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my $filename = $main::filename;
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my $linecount=0;
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local $desc= "";
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if (open(DESC, $Path->{'real'}. $filename."/README.html")) {
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undef $/;
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$desc = <DESC>;
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$/ = "\n";
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close(DESC);
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# Make sure there is no <span> embedded in our string. If so
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# then we've matched against the wrong /span and this string is junk
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# so we'll throw it away and refrain from writing a description.
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# Disallowing embedded spans theoretically removes some flexibility
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# but this seems to be a little used tag and doing this makes lxr
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# a lot faster.
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if ($desc =~ /<SPAN CLASS=\"?LXRSHORTDESC\"?>(.*?)<\/SPAN>/is) {
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$short = $1;
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if (!($short =~ /\<span/is)) {
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return ($short);
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}
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}
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}
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$desc = "";
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if (open(FILE, $Path->{'real'}. $filename."README")) {
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$path = $Path->{'virt'}.$filename;
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$path =~ s#/(.+)/#$1#;
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while(<FILE>){
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if($linecount++ > 10) {
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last;
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}elsif (/\s*$path\s*-\s*-*\s*/i){
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$desc = (split(/\s*$path\s*-\s*-*\s*/i))[1];
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if ($desc) {last};
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}elsif (/\s*$filename\s*-\s*-*\s*/i){
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$desc = (split(/\s*$filename\s*-\s*-*\s*/i))[1];
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if ($desc) {last};
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}elsif (/$path\s*:\s*/i){
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$desc = (split(/ $path\s*:\s*/i))[1];
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if ($desc) {last};
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}elsif (/$filename\s*:\s*/i){
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$desc = (split(/ $filename\s*:\s*/i))[1];
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if ($desc) {last};
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}
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}
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close(FILE);
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}
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#strip trailing asterisks and "*/"
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$desc =~ s#\*/?\s*$##;
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if ($desc){
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#htmlify the comments making links to symbols and files
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$desc = markupstring($desc, $Path->{'virt'});
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return($desc);
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} else {
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return("\ \;");
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}
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}
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# dme: Print a descriptive blurb in directory listings between
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# the document heading and the table containing the actual listing.
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#
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# For Mozilla, we extract this information from the README file if
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# it exists. If the file is short then just print the whole thing.
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# For longer files print the first paragraph or so. As much as
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# possible make this work for randomly formatted files rather than
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# inventing strict rules which create gobbledygook when they're broken.
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sub dirdesc {
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my ($path) = @_;
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if (-f $Path->{'real'}."/README") {
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descreadme($path);
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} elsif (-f $Path->{'real'}."/README.html") {
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descreadmehtml($path);
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}
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}
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sub descreadmehtml {
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my ($path) = @_;
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my $string = "";
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if (!(open(DESC, $Path->{'real'}."/README.html"))) {
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return;
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}
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undef $/;
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$string = <DESC>;
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$/ = "\n";
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close(DESC);
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# if the README is 0 length then give up
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if (!$string) {
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return;
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}
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# check if there's a short desc nested inside the long desc. If not, do
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# a non-greedy search for a long desc. assume there are no other stray
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# spans within the description.
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if ($string =~ /<SPAN CLASS=\"?LXRLONGDESC\"?>(.*?<SPAN CLASS=\"?LXRSHORTDESC\"?>.*?<\/SPAN>.*?)<\/SPAN>/is) {
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$long = $1;
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if (!($long =~ /<span.*?\<span/is)) {
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print($long . "<P>\nSEE ALSO: <A HREF=\"README.html\">README</A>\n");
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}
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} elsif ($string =~ /<SPAN CLASS=\"?LXRLONGDESC\"?>(.*?)<\/SPAN>/is) {
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$long = $1;
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if (!($long =~ /\<span/is)) {
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print($long . "<P>\nSEE ALSO: <A HREF=\"README.html\">README</A>\n");
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}
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}
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}
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sub descreadme {
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my ($path) = @_;
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my $string = "";
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# $string =~ s#(</?([^>^\s]+[^>]*)>.*$)#($2~/B|A|IMG|FONT|BR|EM|I|TT/i)?$1:""#sg;
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my $n;
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my $count;
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my $temp;
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my $maxlines = 20; # If file is less than this then just print it all
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my $minlines = 5; # Too small. Go back and add another paragraph.
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my $chopto = 10; # Truncate long READMEs to this length
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if (!(open(DESC, $Path->{'real'}."/README"))) {
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return;
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}
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undef $/;
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$string = <DESC>;
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$/ = "\n";
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close(DESC);
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# if the README is 0 length then give up
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if (!$string){
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return;
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}
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# strip the emacs tab line
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$string =~ s/.*tab-width:[ \t]*([0-9]+).*\n//;
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# strip the npl
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$string =~ s/.*The contents of this .* All Rights.*Reserved\.//s;
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# strip the short description from the beginning
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$path =~ s#/(.+)/#$1#;
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$string =~ s/.*$path\/*\s+--- .*//;
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# strip away junk
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$string =~ s/#+\s*\n/\n/;
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$string =~ s/---+\s*\n/\n/g;
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$string =~ s/===+\s*\n/\n/g;
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# strip blank lines at beginning and end of file.
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$string =~ s/^\s*\n//gs;
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$string =~ s/\s*\n$//gs;
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chomp($string);
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$_ = $string;
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$count = tr/\n//;
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# If the file is small there's not much use splitting it up.
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# Just print it all
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if ($count <= $maxlines) {
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$string = markupstring($string, $Path->{'virt'});
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$string = convertwhitespace($string);
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print($string);
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} else {
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# grab the first n paragraphs, with n decreasing until the
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# string is 10 lines or shorter or until we're down to
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# one paragraph.
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$n = 6;
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$temp = $string;
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while ( ($count > $chopto) && ($n-- > 1) ) {
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$string =~ s/^((?:(?:[\S\t ]*?\n)+?[\t ]*\n){$n}?)(.*)/$1/s;
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$_ = $string;
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$string =~ s/\s*\n$//gs;
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$count = tr/\n//;
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}
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# if we have too few lines then back up and grab another paragraph
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$_ = $string;
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$count = tr/\n//;
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if ($count < $minlines) {
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$n = $n+1;
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$temp =~ s/^((?:(?:[\S\t ]*?\n)+?[\t ]*\n){$n}?)(.*)/$1/s;
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$string = $temp;
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}
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# if we have more than $maxlines then truncate to $chopto
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# and add an ellipsis.
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if ($count > $maxlines) {
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$string =~ s/^((?:[\S \t]*\n){$chopto}?)(.*)/$1/s;
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chomp($string);
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$string = $string . "\n...";
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}
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# since not all of the README is displayed here,
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# add a link to it.
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chomp($string);
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if ($string =~ /SEE ALSO/) {
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$string = $string . ", README";
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} else {
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$string = $string . "\n\nSEE ALSO: README";
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}
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$string = markupstring($string, $Path->{'virt'});
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$string = convertwhitespace($string);
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# strip blank lines at beginning and end of file again
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$string =~ s/^\s*\n//gs;
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$string =~ s/\s*\n$//gs;
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chomp($string);
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print($string . "<P>\n");
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}
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}
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# dme: substitute carriage returns and spaces in original text
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# for html equivalent so we don't need to use <pre> and can
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# use variable width fonts but preserve the formatting
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sub convertwhitespace {
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my ($string) = @_;
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# handle ascii bulleted lists
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$string =~ s/<p>\n\s+o\s/<p>\n\ \;\ \;o /sg;
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$string =~ s/\n\s+o\s/ \;\n<br>\ \;\ \;o /sg;
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#find paragraph breaks and replace with <P>
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$string =~ s/\n\s*\n/<p>\n/sg;
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return($string);
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}
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