Accept %param declarations for both lexer and parser

lib/lrama/grammar.rb

@@ -332,6 +332,12 @@ def _evaluate_nodes
           self.epilogue = node.code.s_value
         when Node::RequireDecl
           @required = true
+        when Node::ParamDecl
+          node.params.each do |param|
+            code = Grammar::Code::NoReferenceCode.new(type: :param, token_code: param).token_code.s_value
+            self.lex_param = code
+            self.parse_param = code
+          end
         when Node::LexParamDecl
           node.params.each do |param|
             self.lex_param = Grammar::Code::NoReferenceCode.new(type: :lex_param, token_code: param).token_code.s_value

lib/lrama/grammar/node.rb

@@ -18,6 +18,7 @@
 require_relative "node/locations_decl"
 require_relative "node/no_stdlib_decl"
 require_relative "node/nterm_decl"
+require_relative "node/param_decl"
 require_relative "node/parameterized_rule"
 require_relative "node/parse_param_decl"
 require_relative "node/precedence_decl"

lib/lrama/grammar/node/param_decl.rb

@@ -0,0 +1,18 @@
+# rbs_inline: enabled
+# frozen_string_literal: true
+
+module Lrama
+  class Grammar
+    module Node
+      class ParamDecl < Base
+        attr_reader :params #: Array[Lexer::Token::UserCode]
+
+        # @rbs (params: Array[Lexer::Token::UserCode], location: Lexer::Location) -> void
+        def initialize(params:, location:)
+          @params = params
+          super(location: location)
+        end
+      end
+    end
+  end
+end

lib/lrama/lexer.rb

@@ -42,6 +42,7 @@ class Lexer
       %require
       %printer
       %destructor
+      %param
       %lex-param
       %parse-param
       %initial-action