package PLP;
-use v5.6;
+use 5.006;
use PLP::Functions ();
use PLP::Fields;
use PLP::Tie::Delay;
use PLP::Tie::Print;
-use Symbol ();
-#use strict;
+use File::Basename ();
+use File::Spec;
-our $VERSION = '3.10';
+use strict;
-# subs in this package:
-# sendheaders Send headers
-# source($path, $level, $linespec) Read and parse .plp files
-# error($error, $type) Handle errors
+our $VERSION = '3.19';
+
+# Subs in this package:
# _default_error($plain, $html) Default error handler
# clean Reset variables
-# cgi_init Initialization for CGI
-# mod_perl_init($r) Initialization for mod_perl
-# start Start the initialized PLP script
+# error($error, $type) Handle errors
# everything Do everything: CGI
# handler($r) Do everything: mod_perl
+# sendheaders Send headers
+# source($path, $level, $linespec) Read and parse .plp files
+# start Start the initialized PLP script
-
-# Sends the headers waiting in %PLP::Script::header
-sub sendheaders () {
- our $sentheaders = 1;
- print STDOUT "Content-Type: text/plain\n\n" if $PLP::DEBUG & 2;
- print STDOUT map("$_: $PLP::Script::header{$_}\n", keys %PLP::Script::header), "\n";
-};
-
-# Given a filename and optional level (level should be 0 if the caller isn't
-# source() itself), and optional linespec (used by PLP::Functions::Include),
-# this function parses a PLP file and returns Perl code, ready to be eval'ed
-sub source {
- my ($path, $level, $linespec) = @_;
- $level = 0 if not defined $level;
- $linespec = '1' if not defined $linespec;
-
- our ($inA, $inB);
-
- (my $file = $path) =~ s[.*/][];
-
- my $source = $level
- ? qq/\cQ;\n#line 1 "$file"\nprint q\cQ/
- : qq/\n#line 1 "$file"\nprint q\cQ/;
- my $linenr = 0;
-
- local *SOURCE;
- open SOURCE, '<', $path or return $level
- ? qq{\cQ; die qq[Can't open "\Q$path\E" (\Q$!\E)]; print q\cQ}
- : qq{\n#line $linespec\ndie qq[Can't open "\Q$path\E" (\Q$!\E)];};
-
- LINE:
- while (defined (my $line = <SOURCE>)) {
- $linenr++;
- for (;;) {
- $line =~ /
- \G # Begin where left off
- ( \z # End
- | <:=? | :> # PLP tags <:= ... :> <: ... :>
- | <\(.*?\)> # Include tags <(...)>
- | <[^:(][^<:]* # Normal text
- | :[^>][^<:]* # Normal text
- | [^<:]* # Normal text
- )
- /gxs;
- next LINE unless length $1;
- my $part = $1;
- if ($part eq '<:=' and not $inA || $inB) {
- $inA = 1;
- $source .= "\cQ, ";
- } elsif ($part eq '<:' and not $inA || $inB) {
- $inB = 1;
- $source .= "\cQ; ";
- } elsif ($part eq ':>' and $inA) {
- $inA = 0;
- $source .= ", q\cQ";
- } elsif ($part eq ':>' and $inB) {
- $inB = 0;
- $source .= "; print q\cQ";
- } elsif ($part =~ /^<\((.*?)\)>\z/ and not $inA || $inB) {
- $source .= source($1, $level + 1) .
- qq/\cQ, \n#line $linenr "$file"\nq\cQ/;
- } else {
- $part =~ s/\\/\\\\/ if not $inA || $inB;
- $source .= $part;
- }
- }
- }
- $source .= "\cQ" unless $level;
-
- return $source;
-}
-
-# Handles errors, uses the sub reference $PLP::ERROR that gets two arguments:
-# the error message in plain text, and the error message with html entities
-sub error {
- my ($error, $type) = @_;
- if (not defined $type or $type < 100) {
- return undef unless $PLP::DEBUG & 1;
- my $plain = $error;
- (my $html = $plain) =~ s/([<&>])/'&#' . ord($1) . ';'/ge;
- PLP::sendheaders unless $PLP::sentheaders;
- $PLP::ERROR->($plain, $html);
- } else {
- select STDOUT;
- my ($short, $long) = @{
- +{
- 404 => [
- 'Not Found',
- "The requested URL $ENV{REQUEST_URI} was not found on this server."
- ],
- 403 => [
- 'Forbidden',
- "You don't have permission to access $ENV{REQUEST_URI} on this server."
- ],
- }->{$type}
- };
- print "Status: $type\nContent-Type: text/html\n\n",
- qq{<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">\n},
- "<html><head>\n<title>--$type $short</title>\n</head></body>\n",
- "<h1>$short</h1>\n$long<p>\n<hr>\n$ENV{SERVER_SIGNATURE}</body></html>";
- }
-}
+# The _init subs do the following:
+# Set $PLP::code to the initial code
+# Set $ENV{PLP_*} and make PATH_INFO if needed
+# Change the CWD
# This gets referenced as the initial $PLP::ERROR
sub _default_error {
- my ($plain, $html) = @_;
- print qq{<table border=1 class="PLPerror"><tr><td>},
- qq{<span><b>Debug information:</b><BR>$html</td></tr></table>};
+ my ($plain, $html) = @_;
+ print qq{<table border=1 class="PLPerror"><tr><td>},
+ qq{<b>Debug information:</b><br>$html</td></tr></table>};
}
# This cleans up from previous requests, and sets the default $PLP::DEBUG
sub clean {
- @PLP::END = ();
- $PLP::code = '';
- $PLP::sentheaders = 0;
- $PLP::inA = 0;
- $PLP::inB = 0;
- $PLP::DEBUG = 1;
- delete @ENV{ grep /^PLP_/, keys %ENV };
+ @PLP::END = ();
+ $PLP::code = '';
+ $PLP::sentheaders = 0;
+ $PLP::DEBUG = 1;
+ $PLP::print = '';
+ delete @ENV{ grep /^PLP_/, keys %ENV };
}
-# The *_init subs do the following:
-# o Set $PLP::code to the initial code
-# o Set $ENV{PLP_*} and makes PATH_INFO if needed
-# o Change the CWD
-
-# This sub is meant for CGI requests only, and takes apart PATH_TRANSLATED
-# to find the file.
-sub cgi_init {
- my $file = defined $_[0] ? $_[0] : $ENV{PATH_TRANSLATED};
- $ENV{PLP_NAME} = $ENV{PATH_INFO};
- my $path_info;
- while (not -f $file) {
- if (not $file =~ s/(\/+[^\/]*)$//) {
- print STDERR "PLP: Not found: $ENV{PATH_TRANSLATED} ($ENV{REQUEST_URI})\n";
- PLP::error(undef, 404);
- exit;
+# Handles errors, uses subref $PLP::ERROR (default: \&_default_error)
+sub error {
+ my ($error, $type) = @_;
+ if (not defined $type or $type < 100) {
+ return undef unless $PLP::DEBUG & 1;
+ my $plain = $error;
+ (my $html = $plain) =~ s/([<&>])/'&#' . ord($1) . ';'/ge;
+ PLP::sendheaders() unless $PLP::sentheaders;
+ $PLP::ERROR->($plain, $html);
+ } else {
+ select STDOUT;
+ my ($short, $long) = @{
+ +{
+ 404 => [
+ 'Not Found',
+ "The requested URL $ENV{REQUEST_URI} was not found " .
+ "on this server."
+ ],
+ 403 => [
+ 'Forbidden',
+ "You don't have permission to access $ENV{REQUEST_URI} " .
+ "on this server."
+ ],
+ }->{$type}
+ };
+ print "Status: $type\nContent-Type: text/html\n\n",
+ qq{<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">\n<html>},
+ "<head>\n<title>$type $short</title>\n</head></body>\n<h1>$short",
+ "</h1>\n$long<p>\n<hr>\n$ENV{SERVER_SIGNATURE}</body></html>";
}
- my $pi = $1;
- $ENV{PLP_NAME} =~ s/\Q$pi\E$//;
- $path_info = $pi . $path_info;
- }
-
- if (not -r $file) {
- print STDERR "PLP: Can't read: $ENV{PATH_TRANSLATED} ($ENV{REQUEST_URI})\n";
- PLP::error(undef, 403);
- exit;
- }
-
- delete @ENV{
- qw(PATH_TRANSLATED SCRIPT_NAME SCRIPT_FILENAME PATH_INFO),
- grep { /^REDIRECT_/ } keys %ENV
- };
-
- $ENV{PATH_INFO} = $path_info if defined $path_info;
- $ENV{PLP_FILENAME} = $file;
- (my $dir = $file) =~ s{/[^/]+$}[];
- chdir $dir;
-
- $PLP::code = PLP::source($file, 0);
}
-# This is the mod_perl initializer.
-# Returns 0 on success.
-sub mod_perl_init {
- my $r = shift;
-
- $ENV{PLP_FILENAME} = my $filename = $r->filename;
-
- unless (-f $filename) {
- return Apache::Constants::NOT_FOUND;
- }
- unless (-r _) {
- return Apache::Constants::FORBIDDEN;
- }
-
- (my $dir) = $filename =~ m!(.*)/!s;
- chdir $dir;
- $ENV{PLP_NAME} = $r->uri;
- $PLP::code = PLP::source($r->filename);
-
- return 0; # OK
+# Wrap old request handlers.
+sub everything {
+ require PLP::CGI;
+ PLP::CGI::everything();
+}
+sub handler {
+ require PLP::Apache;
+ PLP::Apache::handler(@_);
}
-# Let the games begin!
-# No lexicals may exist at this point.
-sub start {
- no strict;
- tie *PLPOUT, 'PLP::Tie::Print';
- select PLPOUT;
- $PLP::ERROR = \&_default_error;
-
- PLP::Fields::doit();
- {
- package PLP::Script;
- *headers = \%header;
- *cookies = \%cookie;
- PLP::Functions->import();
- # No lexicals may exist at this point.
- eval qq{ package PLP::Script; $PLP::code; };
- PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
- eval { package PLP::Script; $_->() for reverse @PLP::END };
- PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
- }
- PLP::sendheaders() unless $PLP::sentheaders;
- select STDOUT;
- # undef *{"PLP::Script::$_"} for keys %PLP::Script::;
- Symbol::delete_package('PLP::Script');
+# Sends the headers waiting in %PLP::Script::header
+sub sendheaders () {
+ $PLP::sentheaders ||= [ caller 1 ? (caller 1)[1, 2] : (caller)[1, 2] ];
+ print STDOUT "Content-Type: text/plain\n\n" if $PLP::DEBUG & 2;
+ print STDOUT map("$_: $PLP::Script::header{$_}\n", keys %PLP::Script::header), "\n";
}
-# This is run by the CGI script.
-# The CGI script is just:
-# #!/usr/bin/perl
-# use PLP;
-# PLP::everything();
-sub everything {
- clean();
- cgi_init();
- start();
+{
+ my %cached; # Conceal cached sources: ( path => [ [ deps ], source, -M ] )
+
+ # Given a filename and optional level (level should be 0 if the caller isn't
+ # source() itself), and optional linespec (used by PLP::Functions::Include),
+ # this function parses a PLP file and returns Perl code, ready to be eval'ed
+ sub source {
+ my ($file, $level, $linespec, $path) = @_;
+ our $use_cache;
+
+ # $file is displayed, $path is used. $path is constructed from $file if
+ # not given.
+
+ $level = 0 unless defined $level;
+ $linespec = '1' unless defined $linespec;
+
+ if ($level > 128) {
+ %cached = ();
+ return $level
+ ? qq{\cQ; die qq[Include recursion detected]; print q\cQ}
+ : qq{\n#line $linespec\ndie qq[Include recursion detected];};
+ }
+
+ my $in_block = 0; # 1 => "<:", 2 => "<:="
+
+ $path ||= File::Spec->rel2abs($file);
+
+ my $source_start = $level
+ ? qq/\cQ;\n#line 1 "$file"\n$PLP::print q\cQ/
+ : qq/\n#line 1 "$file"\n$PLP::print q\cQ/;
+
+ if ($use_cache and exists $cached{$path}) {
+ BREAKOUT: {
+ my @checkstack = ($path);
+ my $item;
+ my %checked;
+ while (defined(my $item = shift @checkstack)) {
+ next if $checked{$item};
+ last BREAKOUT if $cached{$item}[2] > -M $item;
+ $checked{$item} = 1;
+ push @checkstack, @{ $cached{$item}[0] }
+ if @{ $cached{$item}[0] };
+ }
+ return $level
+ ? $source_start . $cached{$path}[1]
+ : $source_start . $cached{$path}[1] . "\cQ";
+ }
+ }
+
+ $cached{$path} = [ [ ], undef, undef ] if $use_cache;
+
+ my $linenr = 0;
+ my $source = '';
+
+ local *SOURCE;
+ open SOURCE, '<', $path or return $level
+ ? qq{\cQ; die qq[Can't open "\Q$path\E" (\Q$!\E)]; print q\cQ}
+ : qq{\n#line $linespec\ndie qq[Can't open "\Q$path\E" (\Q$!\E)];};
+
+ LINE:
+ while (defined (my $line = <SOURCE>)) {
+ $linenr++;
+ for (;;) {
+ $line =~ /
+ \G # Begin where left off
+ ( \z # End
+ | <:=? | :> # PLP tags <:= ... :> <: ... :>
+ | <\([^)]*\)> # Include tags <(...)>
+ | <[^:(][^<:]* # Normal text
+ | :[^>][^<:]* # Normal text
+ | [^<:]* # Normal text
+ )
+ /gxs;
+ next LINE unless length $1;
+ my $part = $1;
+ if ($part eq '<:=' and not $in_block) {
+ $in_block = 2;
+ $source .= "\cQ, (";
+ } elsif ($part eq '<:' and not $in_block) {
+ $in_block = 1;
+ $source .= "\cQ; ";
+ } elsif ($part eq ':>' and $in_block) {
+ $source .= (
+ $in_block == 2
+ ? "), q\cQ" # 2
+ : "; $PLP::print q\cQ" # 1
+ );
+ $in_block = 0;
+ } elsif ($part =~ /^<\((.*?)\)>\z/ and not $in_block) {
+ my $ipath = File::Spec->rel2abs(
+ $1, File::Basename::dirname($path)
+ );
+ $source .= source($1, $level + 1, undef, $ipath) .
+ qq/\cQ, \n#line $linenr "$file"\nq\cQ/;
+ push @{ $cached{$path}[0] }, $ipath;
+ } else {
+ $part =~ s/\\/\\\\/ unless $in_block;
+ $source .= $part;
+ }
+ }
+ }
+
+ if ($in_block) {
+ $source .= (
+ $in_block == 2
+ ? "), q\cQ" # 2
+ : "; $PLP::print q\cQ" # 1
+ );
+ }
+
+ if ($use_cache) {
+ $cached{$path}[1] = $source;
+ $cached{$path}[2] = -M $path;
+ }
+
+ return $level
+ ? $source_start . $source
+ : $source_start . $source . "\cQ";
+ }
}
-# This is the mod_perl handler.
-sub handler {
- require Apache::Constants;
- clean();
- if (my $ret = mod_perl_init(shift)) {
- return $ret;
- }
- start();
- return Apache::Constants::OK;
+
+# Let the games begin! No lexicals may exist at this point.
+sub start {
+ no strict;
+ tie *PLPOUT, 'PLP::Tie::Print';
+ select PLPOUT;
+ $PLP::ERROR = \&_default_error;
+
+ PLP::Fields::doit();
+ {
+ package PLP::Script;
+ use vars qw(%headers %header %cookies %cookie %get %post %fields);
+ *headers = \%header;
+ *cookies = \%cookie;
+ PLP::Functions->import();
+
+ # No lexicals may exist at this point.
+
+ eval qq{ package PLP::Script; $PLP::code; };
+ PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+
+ eval { package PLP::Script; $_->() for reverse @PLP::END };
+ PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+ }
+ PLP::sendheaders() unless $PLP::sentheaders;
+ select STDOUT;
+ undef *{"PLP::Script::$_"} for keys %PLP::Script::;
+ # Symbol::delete_package('PLP::Script');
+ # The above does not work. TODO - find out why not.
}
1;
<Files *.plp>
SetHandler perl-script
- PerlHandler PLP
+ PerlHandler PLP::Apache
PerlSendHeader On
+ PerlSetVar PLPcache On
</Files>
# Who said CGI was easier to set up? :)
=item * /foo/bar/plp.cgi (local filesystem address)
#!/usr/bin/perl
- use PLP;
- PLP::everything();
+ use PLP::CGI;
+ PLP::CGI::everything();
=item * httpd.conf (for CGI setup)
ScriptAlias /foo/bar/ /PLP_COMMON/
<Directory /foo/bar/>
- AllowOverride None
- Options +ExecCGI
- Order allow,deny
- Allow from all
+ AllowOverride None
+ Options +ExecCGI
+ Order allow,deny
+ Allow from all
</Directory>
AddHandler plp-document plp
Action plp-document /PLP_COMMON/plp.cgi
model: one can just use the normal Perl constructs. PLP runs under mod_perl
for speeds comparable to those of PHP, but can also be run as a CGI script.
-=head1 WEBSITE
+=head2 PLP Syntax
+
+=over 22
+
+=item C<< <: perl_code(); :> >>
+
+With C<< <: >> and C<< :> >>, you can add Perl code to your document. This is
+what PLP is all about. All code outside of these tags is printed. It is
+possible to mix perl language constructs with normal HTML parts of the document:
+
+ <: unless ($ENV{REMOTE_USER}) { :>
+ You are not logged in.
+ <: } :>
+
+C<< :> >> always stops a code block, even when it is found in a string literal.
+
+=item C<< <:= $expression :> >>
+
+Includes a dynamic expression in your document. The expression is evaluated in
+list context. Please note that the expression should not end a statement: avoid
+semi-colons. No whitespace may be between C<< <: >> and the equal sign.
-For now, all documentation is on the website. Everything will be POD one day,
-but until that day, you will need to visit http://plp.juerd.nl/
+C<< foo <:= $bar :> $baz >> is like C<< <: print 'foo ', $bar, ' $baz'; :> >>.
+
+=item C<< <(filename)> >>
+
+Includes another file before the PLP code is executed. The file is included
+literally, so it shares lexical variables. Because this is a compile-time tag,
+it's fast, but you can't use a variable as the filename. You can create
+recursive includes, so beware! (PLP will catch simple recursion: the maximum
+depth is 128.) Whitespace in the filename is not ignored so C<< <( foo.txt)> >>
+includes the file named C< foo.txt>, including the space in its name. A
+compile-time alternative is include(), which is described in L<PLP::Functions>.
+
+=back
+
+=head2 PLP Functions
+
+These are described in L<PLP::Functions>.
+
+=head2 PLP Variables
+
+=over 22
+
+=item $ENV{PLP_NAME}
+
+The URI of the PLP document, without the query string. (Example: C</foo.plp>)
+
+=item $ENV{PLP_FILENAME}
+
+The filename of the PLP document. (Example: C</var/www/index.plp>)
+
+=item $PLP::VERSION
+
+The version of PLP.
+
+=item $PLP::DEBUG
+
+Controls debugging output, and should be treated as a bitmask. The least
+significant bit (1) controls if run-time error messages are reported to the
+browser, the second bit (2) controls if headers are sent twice, so they get
+displayed in the browser. A value of 3 means both features are enabled. The
+default value is 1.
+
+=item $PLP::ERROR
+
+Contains a reference to the code that is used to report run-time errors. You
+can override this to have it in your own design, and you could even make it
+report errors by e-mail. The sub reference gets two arguments: the error message
+as plain text and the error message with special characters encoded with HTML
+entities.
+
+=item %header, %cookie, %get, %post, %fields
+
+These are described in L<PLP::Fields>.
+
+=back
+
+=head2 (mod_perl only) PerlSetVar configuration directives
+
+=over 22
+
+=item PLPcache
+
+Sets caching B<On>/B<Off>. When caching, PLP saves your script in memory and
+doesn't re-read and re-parse it if it hasn't changed. PLP will use more memory,
+but will also run 50% faster.
+
+B<On> is default, anything that isn't =~ /^off$/i is considered On.
+
+=back
+
+=head2 Things that you should know about
+
+Not only syntax is important, you should also be aware of some other important
+features. Your script runs inside the package C<PLP::Script> and shouldn't
+leave it. This is because when your script ends, all global variables in the
+C<PLP::Script> package are destroyed, which is very important if you run under
+mod_perl (they would retain their values if they weren't explicitly destroyed).
+
+Until your first output, you are printing to a tied filehandle C<PLPOUT>. On
+first output, headers are sent to the browser and C<STDOUT> is selected for
+efficiency. To set headers, you must assign to C<$header{ $header_name}> before
+any output. This means the opening C<< <: >> have to be the first characters in
+your document, without any whitespace in front of them. If you start output and
+try to set headers later, an error message will appear telling you on which
+line your output started. An alternative way of setting headers is using Perl's
+BEGIN blocks. BEGIN blocks are executed as soon as possible, before anything
+else.
+
+Because the interpreter that mod_perl uses never ends, C<END { }> blocks won't
+work properly. You should use C<PLP_END { };> instead. Note that this is a not
+a built-in construct, so it needs proper termination with a semi-colon (as do
+C<eval> and C<do>).
+
+Under mod_perl, modules are loaded only once. A good modular design can improve
+performance because of this, but you will have to B<reload> the modules
+yourself when there are newer versions.
+
+The special hashes are tied hashes and do not always behave the way you expect,
+especially when mixed with modules that expect normal CGI environments, like
+CGI.pm. Read L<PLP::Fields> for information more about this.
+
+=head1 FAQ and HowTo
+
+A lot of questions are asked often, so before asking yours, please read the
+FAQ at L<PLP::FAQ>. Some examples can be found at L<PLP::HowTo>.
=head1 NO WARRANTY
No warranty, no guarantees. Use PLP at your own risk, as I disclaim all
responsibility.
-=head1 AUTHOR
+=head1 AUTHORS
+
+Currently maintained by Mischa POSLAWSKY <perl@shiar.org>
+
+Originally by Juerd Waalboer <juerd@cpan.org>
+
+=head1 SEE ALSO
-Juerd Waalboer <juerd@juerd.nl>
+L<PLP::Functions>, L<PLP::Fields>, L<PLP::FAQ>, L<PLP::HowTo>
=cut
+### Garbage bin
+
+# About the #S lines:
+# I wanted to implement Safe.pm so that scripts were run inside a
+# configurable compartment. This needed for XS modules to be pre-loaded,
+# hence the PLPsafe_* Apache directives. However, $safe->reval() lets
+# Apache segfault. End of fun. The lines are still here so that I can
+# s/^#S //g to re-implement them whenever this has been fixed.
+
+#S # For PLPsafe scripts
+#S sub safe_eval {
+#S my ($r, $code) = @_;
+#S $r->send_http_header('text/plain');
+#S require Safe;
+#S unless ($PLP::safe) {
+#S $PLP::safe = Safe->new('PLP::Script');
+#S for ( map split, $r->dir_config->get('PLPsafe_module') ) {
+#S $PLP::safe->share('*' . $_ . '::');
+#S s!::!/!g;
+#S require $_ . '.pm';
+#S }
+#S $PLP::safe->permit(Opcode::full_opset());
+#S $PLP::safe->deny(Opcode::opset(':dangerous'));
+#S }
+#S $PLP::safe->reval($code);
+#S }
+#S my ($r) = @_;
+
+# start()
+#S if ($PLP::use_safe) {
+#S PLP::safe_eval($r, $PLP::code);
+#S } else {
+# eval qq{ package PLP::Script; $PLP::code; };
+#S }
+# PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+#S if ($PLP::use_safe) {
+#S PLP::safe_eval($r, '$_->() for reverse @PLP::END');
+#S } else {
+# eval { package PLP::Script; $_->() for reverse @PLP::END };
+#S }
+# PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+
+###