- 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 .= $part;
+ # Given a filename and optional level (level should be 0 if the caller isn't
+ # source() itself), and optional linespec (used by PLP::Functions::Include),
+ # this function parses a PLP file and returns Perl code, ready to be eval'ed
+ sub source {
+ my ($file, $level, $linespec, $path) = @_;
+ # $file is displayed, $path is used. $path is constructed from $file if
+ # not given.
+ $level = 0 if not defined $level;
+ $linespec = '1' if not defined $linespec;
+
+ if ($level > 128) {
+ %cached = ();
+ return $level
+ ? qq{\cQ; die qq[Include recursion detected]; print q\cQ}
+ : qq{\n#line $linespec\ndie qq[Include recursion detected];};
+ }
+
+ our ($inA, $inB, $use_cache);
+ $path ||= File::Spec->rel2abs($file);
+
+ my $source_start = $level
+ ? qq/\cQ;\n#line 1 "$file"\nprint q\cQ/
+ : qq/\n#line 1 "$file"\nprint q\cQ/;
+
+ if ($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 $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) {
+ 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/\\/\\\\/ if not $inA || $inB;
+ $source .= $part;
+ }