1 files changed, 56 insertions, 0 deletions
diff --git a/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb b/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb
new file mode 100644
index 0000000000..d8f3ae7897
--- /dev/null
+++ b/tool/lrama/lib/lrama/grammar/parameterizing_rule/resolver.rb
@@ -0,0 +1,56 @@
+module Lrama
+  class Grammar
+    class ParameterizingRule
+      class Resolver
+        attr_accessor :rules, :created_lhs_list
+
+        def initialize
+          @rules = []
+          @created_lhs_list = []
+        end
+
+        def add_parameterizing_rule(rule)
+          @rules << rule
+        end
+
+        def find_rule(token)
+          select_rules(@rules, token).last
+        end
+
+        def find_inline(token)
+          @rules.select { |rule| rule.name == token.s_value && rule.is_inline }.last
+        end
+
+        def created_lhs(lhs_s_value)
+          @created_lhs_list.reverse.find { |created_lhs| created_lhs.s_value == lhs_s_value }
+        end
+
+        private
+
+        def select_rules(rules, token)
+          rules = select_not_inline_rules(rules)
+          rules = select_rules_by_name(rules, token.rule_name)
+          rules = rules.select { |rule| rule.required_parameters_count == token.args_count }
+          if rules.empty?
+            raise "Invalid number of arguments. `#{token.rule_name}`"
+          else
+            rules
+          end
+        end
+
+        def select_not_inline_rules(rules)
+          rules.select { |rule| !rule.is_inline }
+        end
+
+        def select_rules_by_name(rules, rule_name)
+          rules = rules.select { |rule| rule.name == rule_name }
+          if rules.empty?
+            raise "Parameterizing rule does not exist. `#{rule_name}`"
+          else
+            rules
+          end
+        end
+      end
+    end
+  end
+end