From 470f769f911d5dd36be6273f58ea44a833102a9b Mon Sep 17 00:00:00 2001
From: Steffen Mueller <smueller@cpan.org>
Date: Wed, 22 May 2013 22:07:59 +0200
Subject: [PATCH] EU::ParseXS: Move several constants out of the runtime object

---
 dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS.pm      | 61 +++++++++++-----------
 .../lib/ExtUtils/ParseXS/Constants.pm              |  2 +
 2 files changed, 33 insertions(+), 30 deletions(-)

diff --git a/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS.pm b/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS.pm
index af000a5..3849339 100644
--- a/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS.pm
+++ b/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS.pm
@@ -44,21 +44,29 @@ our @EXPORT_OK = qw(
   report_error_count
 );
 
+##############################
+# A number of "constants"
+
 our ($C_group_rex, $C_arg);
-BEGIN {
-  # Group in C (no support for comments or literals)
-  $C_group_rex = qr/ [({\[]
-               (?: (?> [^()\[\]{}]+ ) | (??{ $C_group_rex }) )*
-               [)}\]] /x;
-  # Chunk in C without comma at toplevel (no comments):
-  $C_arg = qr/ (?: (?> [^()\[\]{},"']+ )
-         |   (??{ $C_group_rex })
-         |   " (?: (?> [^\\"]+ )
-           |   \\.
-           )* "        # String literal
-                |   ' (?: (?> [^\\']+ ) | \\. )* ' # Char literal
-         )* /xs;
-}
+# Group in C (no support for comments or literals)
+$C_group_rex = qr/ [({\[]
+             (?: (?> [^()\[\]{}]+ ) | (??{ $C_group_rex }) )*
+             [)}\]] /x;
+# Chunk in C without comma at toplevel (no comments):
+$C_arg = qr/ (?: (?> [^()\[\]{},"']+ )
+       |   (??{ $C_group_rex })
+       |   " (?: (?> [^\\"]+ )
+         |   \\.
+         )* "        # String literal
+              |   ' (?: (?> [^\\']+ ) | \\. )* ' # Char literal
+       )* /xs;
+
+# "impossible" keyword (multiple newline)
+my $END = "!End!\n\n";
+# Match an XS Keyword
+my $BLOCK_regexp = '\s*(' . $ExtUtils::ParseXS::Constants::XSKeywordsAlternation . "|$END)\\s*:";
+
+
 
 sub new {
   return bless {} => shift;
@@ -171,13 +179,6 @@ sub process_file {
 
   $self->{typemap} = process_typemaps( $args{typemap}, $pwd );
 
-  my $END = "!End!\n\n";        # "impossible" keyword (multiple newline)
-
-  # Match an XS keyword
-  $self->{BLOCK_re} = '\s*(' .
-    join('|' => @ExtUtils::ParseXS::Constants::XSKeywords) .
-    "|$END)\\s*:";
-
   # Since at this point we're ready to begin printing to the output file and
   # reading from the input file, I want to get as much data as possible into
   # the proto-object $self.  That means assigning to $self and elements of
@@ -783,7 +784,7 @@ EOF
         next;
       }
       last if $_ eq "$END:";
-      $self->death(/^$self->{BLOCK_re}/o ? "Misplaced '$1:'" : "Junk at end of function ($_)");
+      $self->death(/^$BLOCK_regexp/o ? "Misplaced '$1:'" : "Junk at end of function ($_)");
     }
 
     print Q(<<"EOF") if $self->{except};
@@ -1020,7 +1021,7 @@ sub print_section {
   print("#line ", $self->{line_no}->[@{ $self->{line_no} } - @{ $self->{line} } -1], " \"",
         escape_file_for_line_directive($self->{filepathname}), "\"\n")
     if $self->{WantLineNumbers} && !/^\s*#\s*line\b/ && !/^#if XSubPPtmp/;
-  for (;  defined($_) && !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  defined($_) && !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     print "$_\n";
     $consumed_code .= "$_\n";
   }
@@ -1037,7 +1038,7 @@ sub merge_section {
     $_ = shift(@{ $self->{line} });
   }
 
-  for (;  defined($_) && !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  defined($_) && !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     $in .= "$_\n";
   }
   chomp $in;
@@ -1067,7 +1068,7 @@ sub CASE_handler {
 sub INPUT_handler {
   my $self = shift;
   $_ = shift;
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     last if /^\s*NOT_IMPLEMENTED_YET/;
     next unless /\S/;        # skip blank lines
 
@@ -1163,7 +1164,7 @@ sub OUTPUT_handler {
   $self->{have_OUTPUT} = 1;
 
   $_ = shift;
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     next unless /\S/;
     if (/^\s*SETMAGIC\s*:\s*(ENABLE|DISABLE)\s*/) {
       $self->{DoSetMagic} = ($1 eq "ENABLE" ? 1 : 0);
@@ -1302,7 +1303,7 @@ sub ATTRS_handler {
   my $self = shift;
   $_ = shift;
 
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     next unless /\S/;
     trim_whitespace($_);
     push @{ $self->{Attributes} }, $_;
@@ -1313,7 +1314,7 @@ sub ALIAS_handler {
   my $self = shift;
   $_ = shift;
 
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     next unless /\S/;
     trim_whitespace($_);
     $self->get_aliases($_) if $_;
@@ -1324,7 +1325,7 @@ sub OVERLOAD_handler {
   my $self = shift;
   $_ = shift;
 
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     next unless /\S/;
     trim_whitespace($_);
     while ( s/^\s*([\w:"\\)\+\-\*\/\%\<\>\.\&\|\^\!\~\{\}\=]+)\s*//) {
@@ -1400,7 +1401,7 @@ sub PROTOTYPE_handler {
   $self->death("Error: Only 1 PROTOTYPE definition allowed per xsub")
     if $self->{proto_in_this_xsub}++;
 
-  for (;  !/^$self->{BLOCK_re}/o;  $_ = shift(@{ $self->{line} })) {
+  for (;  !/^$BLOCK_regexp/o;  $_ = shift(@{ $self->{line} })) {
     next unless /\S/;
     $specified = 1;
     trim_whitespace($_);
diff --git a/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS/Constants.pm b/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS/Constants.pm
index ffb9449..f457ba5 100644
--- a/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS/Constants.pm
+++ b/dist/ExtUtils-ParseXS/lib/ExtUtils/ParseXS/Constants.pm
@@ -39,4 +39,6 @@ our @XSKeywords      = qw(
   EXPORT_XSUB_SYMBOLS
 );
 
+our $XSKeywordsAlternation = join('|', @XSKeywords);
+
 1;
-- 
2.7.4