mktables: Set caseless equivalent tables

Only a few tables will be affected by /i matching.  This hard-codes them all.

Note that at the point of this commit, the rest of the code doesn't implement
this, so the pod changes will delayed until the rest of the infrastructure is
in place.

1 files changed, 28 insertions, 8 deletions

diff --git a/lib/unicore/mktables b/lib/unicore/mktables
index d0485a9117..1a3f23479d 100644
--- a/lib/unicore/mktables
+++ b/lib/unicore/mktables
@@ -11168,10 +11168,16 @@ END
         $LC->initialize($gc->table('Ll') + $gc->table('Lu'));
 
         # Lt not in release 1.
-        $LC += $gc->table('Lt') if defined $gc->table('Lt');
+        if (defined $gc->table('Lt')) {
+            $LC += $gc->table('Lt');
+            $gc->table('Lt')->set_caseless_equivalent($LC);
+        }
     }
     $LC->add_description('[\p{Ll}\p{Lu}\p{Lt}]');
 
+    $gc->table('Ll')->set_caseless_equivalent($LC);
+    $gc->table('Lu')->set_caseless_equivalent($LC);
+
     my $Cs = $gc->table('Cs');
 
 
@@ -11281,13 +11287,17 @@ sub compile_perl() {
     my $Unicode_Lower = property_ref('Lowercase');
     if (defined $Unicode_Lower && ! $Unicode_Lower->is_empty) {
         $Lower->set_equivalent_to($Unicode_Lower->table('Y'), Related => 1);
+        $Unicode_Lower->table('Y')->set_caseless_equivalent(property_ref('Cased')->table('Y'));
+        $Unicode_Lower->table('N')->set_caseless_equivalent(property_ref('Cased')->table('N'));
+        $Lower->set_caseless_equivalent(property_ref('Cased')->table('Y'));
+
     }
     else {
         $Lower->set_equivalent_to($gc->table('Lowercase_Letter'),
                                                                 Related => 1);
     }
     $Lower->add_alias('XPosixLower');
-    $perl->add_match_table("PosixLower",
+    my $Posix_Lower = $perl->add_match_table("PosixLower",
                             Description => "[a-z]",
                             Initialize => $Lower & $ASCII,
                             );
@@ -11296,13 +11306,16 @@ sub compile_perl() {
     my $Unicode_Upper = property_ref('Uppercase');
     if (defined $Unicode_Upper && ! $Unicode_Upper->is_empty) {
         $Upper->set_equivalent_to($Unicode_Upper->table('Y'), Related => 1);
+        $Unicode_Upper->table('Y')->set_caseless_equivalent(property_ref('Cased')->table('Y'));
+        $Unicode_Upper->table('N')->set_caseless_equivalent(property_ref('Cased')->table('N'));
+        $Upper->set_caseless_equivalent(property_ref('Cased')->table('Y'));
     }
     else {
         $Upper->set_equivalent_to($gc->table('Uppercase_Letter'),
                                                                 Related => 1);
     }
     $Upper->add_alias('XPosixUpper');
-    $perl->add_match_table("PosixUpper",
+    my $Posix_Upper = $perl->add_match_table("PosixUpper",
                             Description => "[A-Z]",
                             Initialize => $Upper & $ASCII,
                             );
@@ -11311,20 +11324,25 @@ sub compile_perl() {
     # otherwise present
     my $Title = $perl->add_match_table('Title');
     my $lt = $gc->table('Lt');
-    if (defined $lt) {
-        $Title->set_equivalent_to($lt, Related => 1);
-    }
+
+    # Earlier versions of mktables had this related to $lt since they have
+    # identical code points, but their casefolds are not equivalent, and so
+    # now must be kept as separate entities.
+    $Title += $lt if defined $lt;
 
     # If this Unicode version doesn't have Cased, set up our own.  From
     # Unicode 5.1: Definition D120: A character C is defined to be cased if
     # and only if C has the Lowercase or Uppercase property or has a
     # General_Category value of Titlecase_Letter.
-    unless (defined property_ref('Cased')) {
+    my $Unicode_Cased = property_ref('Cased');
+    unless (defined $Unicode_Cased) {
         my $cased = $perl->add_match_table('Cased',
                         Initialize => $Lower + $Upper + $Title,
                         Description => 'Uppercase or Lowercase or Titlecase',
                         );
+        $Unicode_Cased = $cased;
     }
+    $Title->set_caseless_equivalent($Unicode_Cased->table('Y'));
 
     # Similarly, set up our own Case_Ignorable property if this Unicode
     # version doesn't have it.  From Unicode 5.1: Definition D121: A character
@@ -11397,10 +11415,12 @@ sub compile_perl() {
         $Alpha->add_description('Alphabetic');
     }
     $Alpha->add_alias('XPosixAlpha');
-    $perl->add_match_table("PosixAlpha",
+    my $Posix_Alpha = $perl->add_match_table("PosixAlpha",
                             Description => "[A-Za-z]",
                             Initialize => $Alpha & $ASCII,
                             );
+    $Posix_Upper->set_caseless_equivalent($Posix_Alpha);
+    $Posix_Lower->set_caseless_equivalent($Posix_Alpha);
 
     my $Alnum = $perl->add_match_table('Alnum',
                         Description => 'Alphabetic and (Decimal) Numeric',