Description: sorting hash keys to remove non-determinism from the generated
 parsers.
Bug: https://rt.cpan.org/Public/Bug/Display.html?id=122977
Bug-Debian: https://bugs.debian.org/903979
Forwarded: https://rt.cpan.org/Ticket/Display.html?id=122977#txn-1796659
Author: Andrius Merkys <andrius.merkys@gmail.com>
Last-Update: 2018-07-19

--- a/lib/Parse/Yapp/Driver.pm
+++ b/lib/Parse/Yapp/Driver.pm
@@ -159,7 +159,7 @@
 sub YYExpect {
     my($self)=shift;
 
-    keys %{$self->{STATES}[$self->{STACK}[-1][0]]{ACTIONS}}
+    sort keys %{$self->{STATES}[$self->{STACK}[-1][0]]{ACTIONS}}
 }
 
 sub YYLexer {
--- a/lib/Parse/Yapp/Grammar.pm
+++ b/lib/Parse/Yapp/Grammar.pm
@@ -340,7 +340,7 @@
     $reachable = _Reachable($rules,$nterm,$term,$ufrules,$ufnterm);
 
     $$grammar{TERM}{chr(0)}=undef;
-    for my $sym (keys %$term) {
+    for my $sym (sort keys %$term) {
             (   exists($$reachable{$sym})
              or exists($values->{PREC}{$sym}) )
         and do {
@@ -352,7 +352,7 @@
     }
 
     $$grammar{NTERM}{'$start'}=[];
-    for my $sym (keys %$nterm) {
+    for my $sym (sort keys %$nterm) {
             exists($$reachable{$sym})
         and do {
                 exists($values->{NULL}{$sym})
--- a/lib/Parse/Yapp/Lalr.pm
+++ b/lib/Parse/Yapp/Lalr.pm
@@ -132,7 +132,7 @@
         }
 
         #Prepare Actions
-        for (keys(%{$$states[$stateno]{ACTIONS}})) {
+        for (sort keys(%{$$states[$stateno]{ACTIONS}})) {
             my($term,$action)=($_,$$states[$stateno]{ACTIONS}{$_});
 
                 $term eq chr(0)
@@ -220,7 +220,7 @@
             exists($$states[$stateno]{GOTOS})
         and    do {
                 $text.= "\n";
-                for (keys(%{$$states[$stateno]{GOTOS}})) {
+                for (sort keys(%{$$states[$stateno]{GOTOS}})) {
                     $text.= "\t$_\tgo to state $$states[$stateno]{GOTOS}{$_}\n";
                 }
             };
@@ -336,7 +336,7 @@
 
                                     "$term => $action";
                                 
-                                } grep { $_ } keys(%{$$state{ACTIONS}}));
+                                } grep { $_ } sort keys(%{$$state{ACTIONS}}));
 
                         $text.="\n\t\t}";
                     };
@@ -359,7 +359,7 @@
 
                                     "'$nterm' => $stateno";
                                 
-                                } keys(%{$$state{GOTOS}}));
+                                } sort keys(%{$$state{GOTOS}}));
                         $text.="\n\t\t}";
                     };
 
@@ -412,7 +412,7 @@
 
             exists($$rel{$x})
         and do {
-            for $y (keys(%{$$rel{$x}})) {
+            for $y (sort keys(%{$$rel{$x}})) {
                     exists($N{$y})
                 or  &$Traverse($y,$d+1);
 
@@ -435,7 +435,7 @@
         };
     };
 
-    for (keys(%$rel)) {
+    for (sort keys(%$rel)) {
             exists($N{$_})
         or  &$Traverse($_,1);
     }
@@ -459,7 +459,7 @@
 	my($grammar)=@_;
     my($rel,$closures);
 
-    for my $symbol (keys(%{$$grammar{NTERM}})) {
+    for my $symbol (sort keys(%{$$grammar{NTERM}})) {
         $closures->{$symbol}=pack('b'.@{$$grammar{RULES}});
 
         for my $ruleno (@{$$grammar{NTERM}{$symbol}}) {
@@ -511,7 +511,7 @@
         push(@{$transitions{$$rhs[$pos]}},[ $ruleno, $pos+1 ]);
     }
 
-    for (keys(%transitions)) {
+    for (sort keys(%transitions)) {
         my($symbol,$core)=($_,$transitions{$_});
         my($corekey)=join(',',map  { join('.',@$_) }
                               sort {    $$a[0] <=> $$b[0]
@@ -573,7 +573,7 @@
 	my($grammar,$termlst,$terminx)=@_;
     my($rel,$first)=( {}, {} );
 
-    for my $symbol (keys(%{$$grammar{NTERM}})) {
+    for my $symbol (sort keys(%{$$grammar{NTERM}})) {
         $first->{$symbol}=pack('b'.@$termlst);
 
         RULE:
@@ -621,7 +621,7 @@
     }
 
     # Pass @$preds through a hash to ensure unicity
-    [ keys( %{ +{ map { ($_,1) } @$preds } } ) ];
+    [ sort keys( %{ +{ map { ($_,1) } @$preds } } ) ];
 }
 
 sub _FirstSfx {
@@ -694,7 +694,7 @@
     		exists($$state{GOTOS})
 		or	next;
 
-        for my $symbol (keys(%{$$state{GOTOS}})) {
+        for my $symbol (sort keys(%{$$state{GOTOS}})) {
             my($tostate)=$$states[$$state{GOTOS}{$symbol}];
             my($goto)="$stateno.$symbol";
 
@@ -731,11 +731,11 @@
 
 sub _ComputeLA {
 	my($grammar,$states)=@_;
-	my($termlst)= [ '',keys(%{$$grammar{TERM}}) ];
+	my($termlst)= [ '',sort keys(%{$$grammar{TERM}}) ];
 
     my($follows,$inconsistent) = _ComputeFollows($grammar,$states,$termlst);
 
-    for my $stateno ( keys(%$inconsistent ) ) {
+    for my $stateno ( sort keys(%$inconsistent ) ) {
         my($state)=$$states[$stateno];
         my($conflict);
 
@@ -794,12 +794,12 @@
         undef;
     };
 
-    for my $stateno (keys(%$inconsistent)) {
+    for my $stateno (sort keys(%$inconsistent)) {
         my($state)=$$states[$stateno];
         my($actions)=$$state{ACTIONS};
         my($nbsr,$nbrr);
 
-        for my $term ( keys(%$actions) ) {
+        for my $term ( sort keys(%$actions) ) {
             my($act)=$$actions{$term};
 
                 @$act > 1
@@ -899,7 +899,7 @@
         and $$actions{error}[0] > 0
         and ++$nodefault;
 
-        for my $term (keys(%$actions)) {
+        for my $term (sort keys(%$actions)) {
 
 			$$actions{$term}=$$actions{$term}[0];
 
@@ -917,7 +917,7 @@
         $default=( map { $$_[0] }
                    sort { $$b[1] <=> $$a[1] or $$b[0] <=> $$a[0] }
                    map { [ $_, scalar(@{$reduces{$_}}) ] }
-                   keys(%reduces))[0];
+                   sort(keys(%reduces)))[0];
 
         delete(@$actions{ @{$reduces{$default}} });
         $$state{ACTIONS}{''}=$default;