Lrama v0.5.11

tool/lrama/lib/lrama.rb

@@ -13,6 +13,5 @@
 require "lrama/state"
 require "lrama/states"
 require "lrama/states_reporter"
-require "lrama/type"
 require "lrama/version"
 require "lrama/warning"

tool/lrama/lib/lrama/grammar.rb

@@ -9,9 +9,9 @@
 require "lrama/grammar/rule"
 require "lrama/grammar/rule_builder"
 require "lrama/grammar/symbol"
+require "lrama/grammar/type"
 require "lrama/grammar/union"
 require "lrama/lexer"
-require "lrama/type"
 
 module Lrama
   # Grammar is the result of parsing an input grammar file
@@ -148,7 +148,7 @@ def epilogue=(epilogue)
     def prepare
       normalize_rules
       collect_symbols
-      replace_token_with_symbol
+      set_lhs_and_rhs
       fill_symbol_number
       fill_default_precedence
       fill_sym_to_rules
@@ -391,6 +391,11 @@ def normalize_rules
           @rules << rule
         end
 
+        builder.parameterizing_rules.each do |rule|
+          add_nterm(id: rule._lhs, tag: rule.lhs_tag)
+          @rules << rule
+        end
+
         builder.midrule_action_rules.each do |rule|
           add_nterm(id: rule._lhs)
         end
@@ -484,7 +489,7 @@ def fill_symbol_number
       end
     end
 
-    def replace_token_with_symbol
+    def set_lhs_and_rhs
       @rules.each do |rule|
         rule.lhs = token_to_symbol(rule._lhs) if rule._lhs
 

tool/lrama/lib/lrama/grammar/code/rule_action.rb

@@ -50,7 +50,7 @@ def rhs
         end
 
         def lhs
-          (@rule.original_rule || @rule).lhs
+          @rule.lhs
         end
 
         def raise_tag_not_found_error(ref)

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder.rb

@@ -8,6 +8,7 @@
 module Lrama
   class Grammar
     class ParameterizingRules
+      # Builder for parameterizing rules
       class Builder
         RULES = {
           option: Lrama::Grammar::ParameterizingRules::Builder::Option,
@@ -20,23 +21,39 @@ class Builder
           separated_list: Lrama::Grammar::ParameterizingRules::Builder::SeparatedList,
         }
 
-        def initialize(token, rule_counter, lhs, user_code, precedence_sym, line)
+        def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
           @token = token
           @key = token.s_value.to_sym
           @rule_counter = rule_counter
-          @lhs = lhs
+          @lhs_tag = lhs_tag
           @user_code = user_code
           @precedence_sym = precedence_sym
           @line = line
+          @builder = nil
         end
 
         def build
-          if RULES.key?(@key)
-            RULES[@key].new(@token, @rule_counter, @lhs, @user_code, @precedence_sym, @line).build
-          else
-            raise "Parameterizing rule does not exist. `#{@key}`"
+          create_builder
+          @builder.build
+        end
+
+        def build_token
+          create_builder
+          @builder.build_token
+        end
+
+        private
+
+        def create_builder
+          unless @builder
+            validate_key!
+            @builder = RULES[@key].new(@token, @rule_counter, @lhs_tag, @user_code, @precedence_sym, @line)
           end
         end
+
+        def validate_key!
+          raise "Parameterizing rule does not exist. `#{@key}`" unless RULES.key?(@key)
+        end
       end
     end
   end

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/base.rb

@@ -2,16 +2,24 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Base class for parameterizing rules builder
         class Base
-          def initialize(token, rule_counter, lhs, user_code, precedence_sym, line)
+          attr_reader :build_token
+
+          def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
             @args = token.args
             @token = @args.first
             @rule_counter = rule_counter
-            @lhs = lhs
+            @lhs_tag = lhs_tag
             @user_code = user_code
             @precedence_sym = precedence_sym
             @line = line
             @expected_argument_num = 1
+            @build_token = nil
+          end
+
+          def build
+            raise NotImplementedError
           end
 
           private

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/list.rb

@@ -2,15 +2,23 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Builder for list of general parameterizing rules
         class List < Base
+
+          # program: list(number)
+          #
+          # =>
+          #
+          # program: list_number
+          # list_number: ε
+          # list_number: list_number number
           def build
             validate_argument_number!
 
             rules = []
-            list_token = Lrama::Lexer::Token::Ident.new(s_value: "list_#{@token.s_value}")
-            rules << Rule.new(id: @rule_counter.increment, _lhs: @lhs, _rhs: [list_token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: list_token, _rhs: [], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: list_token, _rhs: [list_token, @token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            @build_token = Lrama::Lexer::Token::Ident.new(s_value: "list_#{@token.s_value}")
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@build_token, @token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
             rules
           end
         end

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/nonempty_list.rb

@@ -2,15 +2,23 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Builder for nonempty list of general parameterizing rules
         class NonemptyList < Base
+
+          # program: nonempty_list(number)
+          #
+          # =>
+          #
+          # program: nonempty_list_number
+          # nonempty_list_number: number
+          # nonempty_list_number: nonempty_list_number number
           def build
             validate_argument_number!
 
             rules = []
-            nonempty_list_token = Lrama::Lexer::Token::Ident.new(s_value: "nonempty_list_#{@token.s_value}")
-            rules << Rule.new(id: @rule_counter.increment, _lhs: @lhs, _rhs: [nonempty_list_token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: nonempty_list_token, _rhs: [@token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: nonempty_list_token, _rhs: [nonempty_list_token, @token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            @build_token = Lrama::Lexer::Token::Ident.new(s_value: "nonempty_list_#{@token.s_value}")
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@build_token, @token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
             rules
           end
         end

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/option.rb

@@ -2,15 +2,23 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Builder for option of general parameterizing rules
         class Option < Base
+
+          # program: option(number)
+          #
+          # =>
+          #
+          # program: option_number
+          # option_number: ε
+          # option_number: number
           def build
             validate_argument_number!
 
             rules = []
-            option_token = Lrama::Lexer::Token::Ident.new(s_value: "option_#{@token.s_value}")
-            rules << Rule.new(id: @rule_counter.increment, _lhs: @lhs, _rhs: [option_token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: option_token, _rhs: [], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: option_token, _rhs: [@token], token_code: @ser_code, precedence_sym: @precedence_sym, lineno: @line)
+            @build_token = Lrama::Lexer::Token::Ident.new(s_value: "option_#{@token.s_value}")
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
             rules
           end
         end

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/separated_list.rb

@@ -2,23 +2,34 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Builder for separated list of general parameterizing rules
         class SeparatedList < Base
-          def initialize(token, rule_counter, lhs, user_code, precedence_sym, line)
+          def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
             super
             @separator = @args[0]
             @token = @args[1]
             @expected_argument_num = 2
           end
 
+          # program: separated_list(',', number)
+          #
+          # =>
+          #
+          # program: separated_list_number
+          # separated_list_number: ε
+          # separated_list_number: separated_nonempty_list_number
+          # separated_nonempty_list_number: number
+          # separated_nonempty_list_number: separated_nonempty_list_number ',' number
           def build
             validate_argument_number!
 
             rules = []
-            separated_list_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_list_#{@token.s_value}")
-            rules << Rule.new(id: @rule_counter.increment, _lhs: @lhs, _rhs: [separated_list_token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_list_token, _rhs: [], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_list_token, _rhs: [@token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_list_token, _rhs: [separated_list_token, @separator, @token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            @build_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_list_#{@token.s_value}")
+            separated_nonempty_list_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_nonempty_list_#{@token.s_value}")
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [separated_nonempty_list_token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_nonempty_list_token, _rhs: [@token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_nonempty_list_token, _rhs: [separated_nonempty_list_token, @separator, @token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
             rules
           end
         end

tool/lrama/lib/lrama/grammar/parameterizing_rules/builder/separated_nonempty_list.rb

@@ -2,22 +2,29 @@ module Lrama
   class Grammar
     class ParameterizingRules
       class Builder
+        # Builder for separated nonempty list of general parameterizing rules
         class SeparatedNonemptyList < Base
-          def initialize(token, rule_counter, lhs, user_code, precedence_sym, line)
+          def initialize(token, rule_counter, lhs_tag, user_code, precedence_sym, line)
             super
             @separator = @args[0]
             @token = @args[1]
             @expected_argument_num = 2
           end
 
+          # program: separated_nonempty_list(',', number)
+          #
+          # =>
+          #
+          # program: separated_nonempty_list_number
+          # separated_nonempty_list_number: number
+          # separated_nonempty_list_number: separated_nonempty_list_number ',' number
           def build
             validate_argument_number!
 
             rules = []
-            separated_list_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_nonempty_list_#{@token.s_value}")
-            rules << Rule.new(id: @rule_counter.increment, _lhs: @lhs, _rhs: [separated_list_token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_list_token, _rhs: [@token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
-            rules << Rule.new(id: @rule_counter.increment, _lhs: separated_list_token, _rhs: [separated_list_token, @separator, @token], token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            @build_token = Lrama::Lexer::Token::Ident.new(s_value: "separated_nonempty_list_#{@token.s_value}")
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
+            rules << Rule.new(id: @rule_counter.increment, _lhs: @build_token, _rhs: [@build_token, @separator, @token], lhs_tag: @lhs_tag, token_code: @user_code, precedence_sym: @precedence_sym, lineno: @line)
             rules
           end
         end

tool/lrama/lib/lrama/grammar/rule.rb

@@ -1,12 +1,13 @@
 module Lrama
   class Grammar
     # _rhs holds original RHS element. Use rhs to refer to Symbol.
-    class Rule < Struct.new(:id, :_lhs, :lhs, :_rhs, :rhs, :token_code, :position_in_original_rule_rhs, :nullable, :precedence_sym, :lineno, keyword_init: true)
+    class Rule < Struct.new(:id, :_lhs, :lhs, :lhs_tag, :_rhs, :rhs, :token_code, :position_in_original_rule_rhs, :nullable, :precedence_sym, :lineno, keyword_init: true)
       attr_accessor :original_rule
 
       def ==(other)
         self.class == other.class &&
         self.lhs == other.lhs &&
+        self.lhs_tag == other.lhs_tag &&
         self.rhs == other.rhs &&
         self.token_code == other.token_code &&
         self.position_in_original_rule_rhs == other.position_in_original_rule_rhs &&

tool/lrama/lib/lrama/grammar/rule_builder.rb

@@ -3,7 +3,7 @@
 module Lrama
   class Grammar
     class RuleBuilder
-      attr_accessor :lhs, :line
+      attr_accessor :lhs, :lhs_tag, :line
       attr_reader :rhs, :user_code, :precedence_sym
 
       def initialize(rule_counter, midrule_action_counter, position_in_original_rule_rhs = nil, skip_preprocess_references: false)
@@ -14,6 +14,7 @@ def initialize(rule_counter, midrule_action_counter, position_in_original_rule_r
 
         @lhs = nil
         @rhs = []
+        @lhs_tag = nil
         @user_code = nil
         @precedence_sym = nil
         @line = nil
@@ -81,22 +82,16 @@ def preprocess_references
       def build_rules
         tokens = @replaced_rhs
 
-        # Expand Parameterizing rules
-        if tokens.any? {|r| r.is_a?(Lrama::Lexer::Token::Parameterizing) }
-          @rules = @parameterizing_rules
-          @midrule_action_rules = []
-        else
-          rule = Rule.new(
-            id: @rule_counter.increment, _lhs: lhs, _rhs: tokens, token_code: user_code,
-            position_in_original_rule_rhs: @position_in_original_rule_rhs, precedence_sym: precedence_sym, lineno: line
-          )
-          @rules = [rule]
-          @midrule_action_rules = @rule_builders_for_derived_rules.map do |rule_builder|
-            rule_builder.rules
-          end.flatten
-          @midrule_action_rules.each do |r|
-            r.original_rule = rule
-          end
+        rule = Rule.new(
+          id: @rule_counter.increment, _lhs: lhs, _rhs: tokens, token_code: user_code,
+          position_in_original_rule_rhs: @position_in_original_rule_rhs, precedence_sym: precedence_sym, lineno: line
+        )
+        @rules = [rule]
+        @midrule_action_rules = @rule_builders_for_derived_rules.map do |rule_builder|
+          rule_builder.rules
+        end.flatten
+        @midrule_action_rules.each do |r|
+          r.original_rule = rule
         end
       end
 
@@ -115,8 +110,11 @@ def process_rhs
           when Lrama::Lexer::Token::Ident
             @replaced_rhs << token
           when Lrama::Lexer::Token::Parameterizing
-            @parameterizing_rules = ParameterizingRules::Builder.new(token, @rule_counter, lhs, user_code, precedence_sym, line).build
-            @replaced_rhs << token
+            parameterizing = ParameterizingRules::Builder.new(token, @rule_counter, @lhs_tag, user_code, precedence_sym, line)
+            parameterizing.build.each do |r|
+              @parameterizing_rules << r
+            end
+            @replaced_rhs << parameterizing.build_token
           when Lrama::Lexer::Token::UserCode
             prefix = token.referred ? "@" : "$@"
             new_token = Lrama::Lexer::Token::Ident.new(s_value: prefix + @midrule_action_counter.increment.to_s)