[GGE] Further adaptions to Rakudo master

- Rewrote CodeString.emit to do string plumbing instead of using .subst --
  slightly more kosher, but still uses /\d/ and /\w/ for convenience.

- Changed a class-bound variable from 'my' to 'our'. (The alpha branch of
  Rakudo wrongly accepted the former variant.)

- Added an extra layer of parens in the parameter list of
  GGE::Perl6Regex.postcircumfix:<( )>

- Worked around the <-[\t]> bug. \T is a much better way to write this
  anyway.

- Put in a few stringifications where they were suddenly needed.

- Cured a case of sudden overinterpolation in a qq string.

- Replaced two well-placed Str.trans calls with a lot of Str.subst calls,
  since we don't have the former properly yet in Rakudo master.

lib/GGE/Exp.pm

@@ -5,10 +5,17 @@ class CodeString {
     has Str $!contents = '';
     my $counter = 0;
 
-    method emit($string, *@args, *%kwargs) {
-        $!contents ~= $string\
-                        .subst(/\%(\d)/, {   @args[$0] // '...' }, :g)\
-                        .subst(/\%(\w)/, { %kwargs{$0} // '...' }, :g);
+    method emit($string is copy, *@args, *%kwargs) {
+        while index($string, '%') -> $pos {
+            my $new;
+            given substr($string, $pos + 1, 1) {
+                when /\d/ { $new = @args[$_.Int] // '...' }
+                when /\w/ { $new = %kwargs{$_} // '...' }
+                default   { die "Illegal subststr %" ~ $_ }
+            }
+            $string = $string.substr(0, $pos) ~ $new ~ $string.substr($pos + 2)
+        }
+        $!contents ~= $string;
     }
 
     method escape($string) {
@@ -51,7 +58,7 @@ sub NONE   { 2 }
 #>;
 
 class GGE::Exp is GGE::Match {
-    my $group;
+    our $group;
 
     method structure($indent = 0) {
         # RAKUDO: The below was originally written as a map, but there's

lib/GGE/Perl6Regex.pm

@@ -131,7 +131,10 @@ class GGE::Perl6Regex {
         return self.bless(*, :$exp, :$binary);
     }
 
-    method postcircumfix:<( )>($target, :$debug) {
+    # Why the double parens in the parameter list? Apparently, the
+    # postcircumfix:<( )> method gets called with a Capture, so we have to
+    # unpack that.
+    method postcircumfix:<( )>( ($target, :$debug) ) {
         $!binary($target, :$debug);
     }
 

t/perl6regex/01-regex.t

@@ -30,12 +30,12 @@ for @test-files -> $test-file {
         }
         next if $line ~~ /^ \#/;
         $i++;
-        $line ~~ /^ (<-[\t]>*) \t+ (<-[\t]>+) \t+ (<-[\t]>+) \t+ (.*) $/
+        $line ~~ /^ (\T*) \t+ (\T+) \t+ (\T+) \t+ (.*) $/
             or die "Unrecognized line format: $line";
         my ($pattern, $target, $result, $description) = $0, $1, $2, $3;
-        $target  = $target eq q[''] ?? '' !! backslash_escape($target);
-        $result  = backslash_escape($result);
-        my $full-description = "[$test-file:$i] $description";
+        $target  = $target eq q[''] ?? '' !! backslash_escape(~$target);
+        $result  = backslash_escape(~$result);
+        my $full-description = "[$test-file" ~ ":$i] $description";
         my $match;
         my $failed = 1; # RAKUDO: Manual CATCH workaround
         try {
@@ -75,8 +75,10 @@ sub match_perl6regex($pattern, $target) {
 }
 
 sub backslash_escape($string) {
-    return $string.trans(['\n', '\r', '\e', '\t', '\f'] =>
-                         ["\n", "\r", "\e", "\t", "\f"])\
+    # RAKUDO: No .trans again yet
+    #return $string.trans(['\n', '\r', '\e', '\t', '\f'] =>
+    #                     ["\n", "\r", "\e", "\t", "\f"])\
+    return $string.subst(/\\n/, "\n", :g).subst(/\\r/, "\r", :g).subst(/\\e/, "\e", :g).subst(/\\t/, "\t", :g).subst(/\\f/, "\f", :g)\
                   .subst(/'\\x' (<[0..9a..f]>**{2..4})/, { chr(:16($0)) }, :g);
 }
 

test-regex

@@ -13,7 +13,9 @@ my GGE::Match $match
 say $match ?? $match.dump_str('mob', ' ', '') !! "No match\n";
 
 sub backslash_escape($string) {
-    return $string.trans(['\n', '\r', '\e', '\t', '\f'] =>
-                         ["\n", "\r", "\e", "\t", "\f"])\
-                  .subst(/'\\x' (<[0..9a..f]>**{4})/, { chr(:16($0)) }, :g);
+    # RAKUDO: No .trans again yet
+    #return $string.trans(['\n', '\r', '\e', '\t', '\f'] =>
+    #                     ["\n", "\r", "\e", "\t", "\f"])\
+    return $string.subst(/\\n/, "\n", :g).subst(/\\r/, "\r", :g).subst(/\\e/, "\e", :g).subst(/\\t/, "\t", :g).subst(/\\f/, "\f", :g)\
+                  .subst(/'\\x' (<[0..9a..f]>**{2..4})/, { chr(:16($0)) }, :g);
 }