Implement simple binary expressions

Rakefile

@@ -63,3 +63,35 @@ end
 file 'build/stage2b' => ['build/stage2b.s', 'boot/common-boot.s'] do |t|
   sh CROSS_GCC, '-nostdlib', '-o', t.name, *t.prerequisites
 end
+
+desc 'Print remaining lines to rewrite'
+task :statistics do
+  def is_false_positive(word)
+    word.start_with?('(*') ||
+      word.start_with?('*)') ||
+      ('A'..'Z').include?(word[0]) ||
+      /^[[:alpha:]][[:digit:]]$/.match(word)
+  end
+
+  lines = File.read('boot/stage2.elna')
+    .split("\n")
+    .select { |line| line.start_with? "\t" }
+    .map { |line| line.delete_prefix("\t").split(' ') }
+    .reject { |words| is_false_positive(words.first) }
+    .group_by do |words|
+      if words.first.length < 5
+        case words.first
+        when 'goto'
+          'Statements'
+        else
+          words.first
+        end
+      else
+        'Statements'
+      end
+    end
+
+  lines.each do |key, value|
+    puts "#{key}: #{value.count}"
+  end
+end