Merge pull request #12970 from andemark/challenge-346

ch-2.raku grammar improved

1 files changed, 1265 insertions, 36 deletions

diff --git a/challenge-346/mark-anderson/raku/ch-2.raku b/challenge-346/mark-anderson/raku/ch-2.raku
index 60238a8f9d..56d4f67876 100644
--- a/challenge-346/mark-anderson/raku/ch-2.raku
+++ b/challenge-346/mark-anderson/raku/ch-2.raku
@@ -14,31 +14,20 @@ is-deeply magic-expression("1001",  2), ("1+0*0+1", "1+0+0+1", "1+0-0+1", "1-0*0
 
 grammar Calculate 
 {
-    rule TOP        { <add-sub>                }
-    rule add-sub    { <mult>+   % $<op>=<[+-]> } 
-    rule mult       { <digits>+ % '*'          }
-    rule digits     { <digit>+                 }
+    rule  TOP    { <add>           }
+    rule  add    { <subt>+   % '+' }
+    rule  subt   { <mult>+   % '-' }
+    rule  mult   { <digits>+ % '*' }
+    rule  digits { <digit>+        }
 }
 
 class Actions 
 {
-    method TOP($/)    { make $<add-sub>.made      }
-    method digits($/) { make $/                   }
-    method mult($/)   { make [*] $<digits>>>.made }
-    method add-sub($/) 
-    {
-        my @ops = $<op>>>.Str; 
-        my @vals = $<mult>>>.made;  
-        my $result;     
-
-        for @vals Z @ops.unshift('+')
-        {
-            if .tail eq '+' { $result += .head }
-            else            { $result -= .head }
-        }
-
-        make $result
-    }
+    method TOP   ($/) { make $<add>.made          }
+    method add   ($/) { make [+] $<subt>>>.made   }
+    method subt  ($/) { make [-] $<mult>>>.made   }
+    method mult  ($/) { make [*] $<digits>>>.made }
+    method digits($/) { make $/.UInt              }
 }
 
 multi magic-expression($str where *.chars > 7, $target) 
@@ -54,28 +43,1268 @@ multi magic-expression($str, $target)
     gather for @partitions[@nums-2]<> -> @p
     {
         my @r = @nums.rotor(@p)>>.join;
-        next if any @r ~~ /^0\d/;
+        next if any @r ~~ /^0<digit>/;
 
         for @operators[@p-2]<> -> @o
         {
             my $exp = flat roundrobin @r, @o;
-            take [~] $exp if Calculate.parse($exp, actions => Actions).made == $target
+            take [~] $exp if Calculate.parse($exp, :actions(Actions)).made == $target
         }
     }
 }
 
 =finish
+
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