Use Lrama LALR parser generator instead of Bisonv3_3_0_preview1

https://bugs.ruby-lang.org/issues/19637

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/tool/lrama/lib/lrama/bitmap.rb b/tool/lrama/lib/lrama/bitmap.rb
new file mode 100644
index 0000000000..8349a23c34
--- /dev/null
+++ b/tool/lrama/lib/lrama/bitmap.rb
@@ -0,0 +1,29 @@
+module Lrama
+  module Bitmap
+    def self.from_array(ary)
+      bit = 0
+
+      ary.each do |int|
+        bit |= (1 << int)
+      end
+
+      bit
+    end
+
+    def self.to_array(int)
+      a = []
+      i = 0
+
+      while int > 0 do
+        if int & 1 == 1
+          a << i
+        end
+
+        i += 1
+        int >>= 1
+      end
+
+      a
+    end
+  end
+end