Merge pull request #785 from mbj/change/to-modern-ast

Change to unparsers modern AST

Gemfile.lock

@@ -15,7 +15,7 @@ PATH
       parser (~> 2.5.1)
       procto (~> 0.0.2)
       regexp_parser (~> 1.2)
-      unparser (~> 0.3.0)
+      unparser (~> 0.4.0)
     mutant-rspec (0.8.20)
       mutant (~> 0.8.20)
       rspec-core (>= 3.4.0, < 4.0.0)
@@ -141,7 +141,7 @@ GEM
     simplecov-html (0.10.2)
     thread_safe (0.3.6)
     unicode-display_width (1.4.0)
-    unparser (0.3.0)
+    unparser (0.4.0)
       abstract_type (~> 0.0.7)
       adamantium (~> 0.2.0)
       concord (~> 0.1.5)

lib/mutant.rb

@@ -135,7 +135,6 @@ require 'mutant/mutator/node/send'
 require 'mutant/mutator/node/send/binary'
 require 'mutant/mutator/node/send/conditional'
 require 'mutant/mutator/node/send/attribute_assignment'
-require 'mutant/mutator/node/send/index'
 require 'mutant/mutator/node/when'
 require 'mutant/mutator/node/class'
 require 'mutant/mutator/node/define'
@@ -151,6 +150,8 @@ require 'mutant/mutator/node/regopt'
 require 'mutant/mutator/node/resbody'
 require 'mutant/mutator/node/rescue'
 require 'mutant/mutator/node/match_current_line'
+require 'mutant/mutator/node/index'
+require 'mutant/mutator/node/procarg_zero'
 require 'mutant/loader'
 require 'mutant/context'
 require 'mutant/scope'

lib/mutant/ast/meta/send.rb

@@ -30,14 +30,7 @@ module Mutant
           naked_proc? || proc_new?
         end
 
-        # Test if AST node is a valid assignment target
-        #
-        # @return [Boolean]
-        def assignment?
-          index_assignment? || attribute_assignment?
-        end
-
-        # Test if AST node is an attribute assignment?
+        # Test if AST node is a valid attribute assignment
         #
         # @return [Boolean]
         def attribute_assignment?
@@ -45,13 +38,6 @@ module Mutant
           selector.to_s.end_with?(ATTRIBUTE_ASSIGNMENT_SELECTOR_SUFFIX)
         end
 
-        # Test if AST node is an index assign
-        #
-        # @return [Boolean]
-        def index_assignment?
-          selector.equal?(INDEX_ASSIGNMENT_SELECTOR)
-        end
-
         # Test for binary operator implemented as method
         #
         # @return [Boolean]

lib/mutant/ast/types.rb

@@ -182,10 +182,12 @@ module Mutant
       # Nodes that are NOT generated by parser but used by mutant / unparser.
       GENERATED = Set.new(%i[empty]).freeze
 
-      EXTRA = Set.new(GENERATED + REGEXP)
+      # Nodes missing from parser metadata
+      MISSING = Set.new(%i[index indexasgn lambda procarg0]).freeze
 
-      # All node types mutant handles
-      ALL = Set.new((Parser::Meta::NODE_TYPES + EXTRA) - BLACKLIST).freeze
+      ALL = Set.new(
+        (Parser::Meta::NODE_TYPES + GENERATED + REGEXP + MISSING) - BLACKLIST
+      ).freeze
     end # Types
   end # AST
 end # Mutant

lib/mutant/meta/example/dsl.rb

@@ -99,7 +99,7 @@ module Mutant
         def node(input)
           case input
           when String
-            Unparser::Preprocessor.run(::Parser::CurrentRuby.parse(input))
+            Unparser::Preprocessor.run(Unparser.parse(input))
           when ::Parser::AST::Node
             input
           else

lib/mutant/mutator/node.rb

@@ -96,6 +96,13 @@ module Mutant
         emit(::Parser::AST::Node.new(node.type, children))
       end
 
+      # Emit propagation if node can stand alone
+      #
+      # @return [undefined]
+      def emit_propagation(node)
+        emit(node) unless AST::Types::NOT_STANDALONE.include?(node.type)
+      end
+
       # Emit singleton literals
       #
       # @return [undefined]

lib/mutant/mutator/node/argument.rb

@@ -67,7 +67,6 @@ module Mutant
           end
 
         end # Optional
-
       end # Argument
     end # Node
   end # Mutator

lib/mutant/mutator/node/arguments.rb

@@ -24,11 +24,23 @@ module Mutant
         # @return [undefined]
         def emit_argument_presence
           emit_type
+
           Util::Array::Presence.call(children).each do |children|
-            emit_type(*children)
+            if children.one? && n_mlhs?(Mutant::Util.one(children))
+              emit_procarg(Mutant::Util.one(children))
+            else
+              emit_type(*children)
+            end
           end
         end
 
+        # Emit procarg form
+        #
+        # @return [undefined]
+        def emit_procarg(arg)
+          emit_type(s(:procarg0, *arg))
+        end
+
         # Emit argument mutations
         #
         # @return [undefined]

lib/mutant/mutator/node/block.rb

@@ -17,7 +17,7 @@ module Mutant
         # @return [undefined]
         def dispatch
           emit_singletons
-          emit(send)
+          emit(send) unless n_lambda?(send)
           emit_send_mutations(&method(:n_send?))
           emit_arguments_mutations
 

lib/mutant/mutator/node/index.rb

@@ -0,0 +1,129 @@
+# frozen_string_literal: true
+
+module Mutant
+  class Mutator
+    class Node
+      # Base mutator for index operations
+      class Index < self
+        NO_VALUE_RANGE    = (1..-1).freeze
+        SEND_REPLACEMENTS = %i[at fetch key?].freeze
+
+        private_constant(*constants(false))
+
+        children :receiver
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        def dispatch
+          emit_singletons
+          emit_receiver_mutations { |node| !n_nil?(node) }
+          emit(receiver)
+          emit_send_forms
+          emit_drop_mutation
+          mutate_indices
+        end
+
+        # Emit send forms
+        #
+        # @return [undefined]
+        def emit_send_forms
+          return if asgn_left?
+
+          SEND_REPLACEMENTS.each do |selector|
+            emit(s(:send, receiver, selector, *indices))
+          end
+        end
+
+        # Emit mutation `foo[n..-1]` -> `foo.drop(n)`
+        #
+        # @return [undefined]
+        def emit_drop_mutation
+          return unless indices.one? && n_irange?(Mutant::Util.one(indices))
+
+          start, ending = *indices.first
+
+          return unless ending.eql?(s(:int, -1))
+
+          emit(s(:send, receiver, :drop, start))
+        end
+
+        # Mutate indices
+        #
+        # @return [undefined]
+        def mutate_indices
+          children_indices(index_range).each do |index|
+            emit_propagation(children.fetch(index)) unless asgn_left?
+            delete_child(index)
+            mutate_child(index)
+          end
+        end
+
+        # The index nodes
+        #
+        # @return [Enumerable<Parser::AST::Node>]
+        def indices
+          children[index_range]
+        end
+
+        class Read < self
+
+          handle :index
+
+        private
+
+          # The range index children can be found
+          #
+          # @return [Range]
+          def index_range
+            NO_VALUE_RANGE
+          end
+        end
+
+        # Mutator for index assignments
+        class Assign < self
+          REGULAR_RANGE = (1..-2).freeze
+
+          private_constant(*constants(false))
+
+          handle :indexasgn
+
+        private
+
+          # Emit mutations
+          #
+          # @return [undefined]
+          def dispatch
+            super()
+
+            return if asgn_left?
+
+            emit_index_read
+            emit(children.last)
+            mutate_child(children.length.pred)
+          end
+
+          # Emit index read
+          #
+          # @return [undefined]
+          def emit_index_read
+            emit(s(:index, receiver, *children[index_range]))
+          end
+
+          # Index indices
+          #
+          # @return [Range<Integer>]
+          def index_range
+            if asgn_left?
+              NO_VALUE_RANGE
+            else
+              REGULAR_RANGE
+            end
+          end
+        end # Assign
+      end # Index
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/noop.rb

@@ -7,7 +7,7 @@ module Mutant
       # Mutation emitter to handle noop nodes
       class Noop < self
 
-        handle(:__ENCODING__, :block_pass, :cbase)
+        handle(:__ENCODING__, :block_pass, :cbase, :lambda)
 
       private
 

lib/mutant/mutator/node/procarg_zero.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+module Mutant
+  class Mutator
+    class Node
+      class ProcargZero < self
+        MAP = {
+          ::Parser::AST::Node => :emit_argument_node_mutations,
+          Symbol              => :emit_argument_symbol_mutations
+        }.freeze
+
+        private_constant(*constants(false))
+
+        handle :procarg0
+
+        children :argument
+
+      private
+
+        # Emit mutations
+        #
+        # @return [undefined]
+        def dispatch
+          __send__(MAP.fetch(argument.class))
+        end
+
+        # Emit argument symbol mutations
+        #
+        # @return [undefined]
+        def emit_argument_symbol_mutations
+          emit_type(:"_#{argument}") unless argument.to_s.start_with?('_')
+        end
+
+        # Emit argument node mutations
+        #
+        # @return [undefined]
+        def emit_argument_node_mutations
+          emit_argument_mutations
+          first = Mutant::Util.one(argument.children)
+          emit_type(first)
+        end
+      end # ProcargZero
+    end # Node
+  end # Mutator
+end # Mutant

lib/mutant/mutator/node/send.rb

@@ -40,7 +40,6 @@ module Mutant
           values_at:     %i[fetch_values],
           match:         %i[match?],
           '=~':          %i[match?],
-          :[] =>         %i[at fetch key?],
           :== =>         %i[eql? equal?],
           :>= =>         %i[> == eql? equal?],
           :<= =>         %i[< == eql? equal?],
@@ -61,17 +60,7 @@ module Mutant
         # @return [undefined]
         def dispatch
           emit_singletons
-          if meta.index_assignment?
-            run(Index::Assign)
-          else
-            non_index_dispatch
-          end
-        end
 
-        # Perform non index dispatch
-        #
-        # @return [undefined]
-        def non_index_dispatch
           if meta.binary_method_operator?
             run(Binary)
           elsif meta.attribute_assignment?
@@ -117,7 +106,6 @@ module Mutant
           emit_dig_mutation
           emit_double_negation_mutation
           emit_lambda_mutation
-          emit_drop_mutation
         end
 
         # Emit selector mutations specific to top level constants
@@ -167,19 +155,6 @@ module Mutant
           emit(s(:send, fetch_mutation, :dig, *tail))
         end
 
-        # Emit mutation `foo[n..-1]` -> `foo.drop(n)`
-        #
-        # @return [undefined]
-        def emit_drop_mutation
-          return if !selector.equal?(:[]) || !arguments.one? || !n_irange?(arguments.first)
-
-          start, ending = *arguments.first
-
-          return unless ending.eql?(s(:int, -1))
-
-          emit(s(:send, receiver, :drop, start))
-        end
-
         # Emit mutation from `to_i` to `Integer(...)`
         #
         # @return [undefined]
@@ -227,8 +202,7 @@ module Mutant
         #
         # @return [undefined]
         def emit_argument_propagation
-          node = arguments.first
-          emit(node) if arguments.one? && !NOT_STANDALONE.include?(node.type)
+          emit_propagation(Mutant::Util.one(arguments)) if arguments.one?
         end
 
         # Emit receiver mutations

lib/mutant/mutator/node/send/index.rb

@@ -1,52 +0,0 @@
-# frozen_string_literal: true
-
-module Mutant
-  class Mutator
-    class Node
-      class Send
-        # Base mutator for index operations
-        class Index < self
-
-          # Mutator for index assignments
-          class Assign < self
-
-            define_named_child(:value, -1)
-
-            INDEX_RANGE = (2..-2).freeze
-
-          private
-
-            # Emit mutations
-            #
-            # @return [undefined]
-            def dispatch
-              emit_naked_receiver
-              emit_value_mutations
-              emit_index_read
-              emit(value)
-              mutate_indices
-            end
-
-            # Mutate indices
-            #
-            # @return [undefined]
-            def mutate_indices
-              children_indices(INDEX_RANGE).each do |index|
-                delete_child(index)
-                mutate_child(index)
-              end
-            end
-
-            # Emit index read
-            #
-            # @return [undefined]
-            def emit_index_read
-              emit_type(receiver, :[], *children[INDEX_RANGE])
-            end
-
-          end # Assign
-        end # Index
-      end # Send
-    end # Node
-  end # Mutator
-end # Mutant

lib/mutant/parser.rb

@@ -18,7 +18,7 @@ module Mutant
     #
     # @return [AST::Node]
     def call(path)
-      @cache[path] ||= ::Parser::CurrentRuby.parse(path.read)
+      @cache[path] ||= Unparser.parse(path.read)
     end
 
   end # Parser

lib/mutant/zombifier.rb

@@ -115,7 +115,7 @@ module Mutant
     #
     # @return [Parser::AST::Node]
     def namespaced_node(source_path)
-      s(:module, s(:const, nil, namespace), ::Parser::CurrentRuby.parse(source_path.read))
+      s(:module, s(:const, nil, namespace), Unparser.parse(source_path.read))
     end
 
   end # Zombifier

meta/block.rb

@@ -24,8 +24,8 @@ Mutant::Meta::Example.add :block do
   mutation 'foo { |a, b| raise }'
   mutation 'foo { |a, _b| }'
   mutation 'foo { |_a, b| }'
-  mutation 'foo { |a| }'
-  mutation 'foo { |b| }'
+  mutation 'foo { |a, | }'
+  mutation 'foo { |b, | }'
   mutation 'foo { || }'
 end
 
@@ -39,7 +39,7 @@ Mutant::Meta::Example.add :block do
   mutation 'foo { |(a), c| }'
   mutation 'foo { |(b), c| }'
   mutation 'foo { |(a, b)| }'
-  mutation 'foo { |c| }'
+  mutation 'foo { |c, | }'
   mutation 'foo { |(_a, b), c| }'
   mutation 'foo { |(a, _b), c| }'
   mutation 'foo { |(a, b), _c| }'
@@ -61,6 +61,25 @@ Mutant::Meta::Example.add :block do
   mutation 'foo {}'
 end
 
+Mutant::Meta::Example.add :block do
+  source 'foo { |_a| }'
+
+  singleton_mutations
+  mutation 'foo { || }'
+  mutation 'foo { |_a| raise }'
+  mutation 'foo'
+end
+
+Mutant::Meta::Example.add :block do
+  source 'foo { |a| }'
+
+  singleton_mutations
+  mutation 'foo { || }'
+  mutation 'foo { |a| raise }'
+  mutation 'foo { |_a| }'
+  mutation 'foo'
+end
+
 Mutant::Meta::Example.add :block do
   source 'foo { |(a)| }'
 

meta/index.rb

@@ -0,0 +1,133 @@
+# frozen_string_literal: true
+
+Mutant::Meta::Example.add :index do
+  source 'self.foo[]'
+
+  singleton_mutations
+  mutation 'self.foo'
+  mutation 'self.foo.at()'
+  mutation 'self.foo.fetch()'
+  mutation 'self.foo.key?()'
+  mutation 'self[]'
+  mutation 'foo[]'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'foo[1]'
+
+  singleton_mutations
+  mutation '1'
+  mutation 'foo'
+  mutation 'foo[]'
+  mutation 'foo.at(1)'
+  mutation 'foo.fetch(1)'
+  mutation 'foo.key?(1)'
+  mutation 'self[1]'
+  mutation 'foo[0]'
+  mutation 'foo[2]'
+  mutation 'foo[-1]'
+  mutation 'foo[nil]'
+  mutation 'foo[self]'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'foo[n..-2]'
+
+  singleton_mutations
+  mutation 'n..-2'
+  mutation 'foo'
+  mutation 'foo[]'
+  mutation 'foo.at(n..-2)'
+  mutation 'foo.fetch(n..-2)'
+  mutation 'foo.key?(n..-2)'
+  mutation 'self[n..-2]'
+  mutation 'foo[nil]'
+  mutation 'foo[self]'
+  mutation 'foo[n..nil]'
+  mutation 'foo[n..self]'
+  mutation 'foo[n..-1]'
+  mutation 'foo[n..2]'
+  mutation 'foo[n..0]'
+  mutation 'foo[n..1]'
+  mutation 'foo[n..-3]'
+  mutation 'foo[n...-2]'
+  mutation 'foo[nil..-2]'
+  mutation 'foo[self..-2]'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'foo[n...-1]'
+
+  singleton_mutations
+  mutation 'n...-1'
+  mutation 'foo'
+  mutation 'foo[]'
+  mutation 'foo.at(n...-1)'
+  mutation 'foo.fetch(n...-1)'
+  mutation 'foo.key?(n...-1)'
+  mutation 'self[n...-1]'
+  mutation 'foo[nil]'
+  mutation 'foo[self]'
+  mutation 'foo[n...nil]'
+  mutation 'foo[n...self]'
+  mutation 'foo[n..-1]'
+  mutation 'foo[n...0]'
+  mutation 'foo[n...1]'
+  mutation 'foo[n...-2]'
+  mutation 'foo[nil...-1]'
+  mutation 'foo[self...-1]'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'foo[n..-1]'
+
+  singleton_mutations
+  mutation 'n..-1'
+  mutation 'foo'
+  mutation 'foo[]'
+  mutation 'foo.at(n..-1)'
+  mutation 'foo.fetch(n..-1)'
+  mutation 'foo.key?(n..-1)'
+  mutation 'self[n..-1]'
+  mutation 'foo[nil]'
+  mutation 'foo[self]'
+  mutation 'foo[n..nil]'
+  mutation 'foo[n..self]'
+  mutation 'foo[n..0]'
+  mutation 'foo[n..1]'
+  mutation 'foo[n..-2]'
+  mutation 'foo[n...-1]'
+  mutation 'foo[nil..-1]'
+  mutation 'foo[self..-1]'
+  mutation 'foo.drop(n)'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'self[foo]'
+
+  singleton_mutations
+  mutation 'self[self]'
+  mutation 'self[nil]'
+  mutation 'self[]'
+  mutation 'self.at(foo)'
+  mutation 'self.fetch(foo)'
+  mutation 'self.key?(foo)'
+  mutation 'foo'
+end
+
+Mutant::Meta::Example.add :index do
+  source 'foo[*bar]'
+
+  singleton_mutations
+  mutation 'foo'
+  mutation 'foo[]'
+  mutation 'foo.at(*bar)'
+  mutation 'foo.fetch(*bar)'
+  mutation 'foo.key?(*bar)'
+  mutation 'foo[nil]'
+  mutation 'foo[self]'
+  mutation 'foo[bar]'
+  mutation 'foo[*self]'
+  mutation 'foo[*nil]'
+  mutation 'self[*bar]'
+end

meta/indexasgn.rb

@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+Mutant::Meta::Example.add :indexasgn do
+  source 'foo[bar] = baz'
+
+  singleton_mutations
+  mutation 'self[bar] = baz'
+  mutation 'foo'
+  mutation 'foo[bar]'
+  mutation 'foo.at(bar)'
+  mutation 'foo.fetch(bar)'
+  mutation 'foo.key?(bar)'
+  mutation 'foo[bar] = self'
+  mutation 'foo[bar] = nil'
+  mutation 'foo[nil] = baz'
+  mutation 'foo[self] = baz'
+  mutation 'foo[] = baz'
+  mutation 'baz'
+  mutation 'bar'
+end
+
+Mutant::Meta::Example.add :indexasgn, :op_asgn do
+  source 'self[foo] += bar'
+
+  singleton_mutations
+  mutation 'self[] += bar'
+  mutation 'self[nil] += bar'
+  mutation 'self[self] += bar'
+  mutation 'self[foo] += nil'
+  mutation 'self[foo] += self'
+end

meta/lambda.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+Mutant::Meta::Example.add :block, :lambda do
+  source '->() {}'
+
+  singleton_mutations
+
+  mutation '->() { raise }'
+end

meta/send.rb

@@ -353,20 +353,6 @@ Mutant::Meta::Example.add :send do
   mutation 'baz'
 end
 
-Mutant::Meta::Example.add :send do
-  source 'foo[bar] = baz'
-
-  singleton_mutations
-  mutation 'foo'
-  mutation 'foo[bar]'
-  mutation 'foo[bar] = self'
-  mutation 'foo[bar] = nil'
-  mutation 'foo[nil] = baz'
-  mutation 'foo[self] = baz'
-  mutation 'foo[] = baz'
-  mutation 'baz'
-end
-
 Mutant::Meta::Example.add :send do
   source 'foo(*bar)'
 
@@ -484,36 +470,6 @@ Mutant::Meta::Example.add :send do
   mutation 'self / foo'
 end
 
-Mutant::Meta::Example.add :send do
-  source 'foo[1]'
-
-  singleton_mutations
-  mutation '1'
-  mutation 'foo'
-  mutation 'foo[]'
-  mutation 'foo.at(1)'
-  mutation 'foo.fetch(1)'
-  mutation 'foo.key?(1)'
-  mutation 'self[1]'
-  mutation 'foo[0]'
-  mutation 'foo[2]'
-  mutation 'foo[-1]'
-  mutation 'foo[nil]'
-  mutation 'foo[self]'
-end
-
-Mutant::Meta::Example.add :send do
-  source 'self.foo[]'
-
-  singleton_mutations
-  mutation 'self.foo'
-  mutation 'self.foo.at()'
-  mutation 'self.foo.fetch()'
-  mutation 'self.foo.key?()'
-  mutation 'self[]'
-  mutation 'foo[]'
-end
-
 Mutant::Meta::Example.add :send do
   source 'foo(n..-1)'
 
@@ -532,108 +488,6 @@ Mutant::Meta::Example.add :send do
   mutation 'foo(n..-2)'
 end
 
-Mutant::Meta::Example.add :send do
-  source 'foo[n..-2]'
-
-  singleton_mutations
-  mutation 'n..-2'
-  mutation 'foo'
-  mutation 'foo[]'
-  mutation 'foo.at(n..-2)'
-  mutation 'foo.fetch(n..-2)'
-  mutation 'foo.key?(n..-2)'
-  mutation 'self[n..-2]'
-  mutation 'foo[nil]'
-  mutation 'foo[self]'
-  mutation 'foo[n..nil]'
-  mutation 'foo[n..self]'
-  mutation 'foo[n..-1]'
-  mutation 'foo[n..2]'
-  mutation 'foo[n..0]'
-  mutation 'foo[n..1]'
-  mutation 'foo[n..-3]'
-  mutation 'foo[n...-2]'
-  mutation 'foo[nil..-2]'
-  mutation 'foo[self..-2]'
-end
-
-Mutant::Meta::Example.add :send do
-  source 'foo[n...-1]'
-
-  singleton_mutations
-  mutation 'n...-1'
-  mutation 'foo'
-  mutation 'foo[]'
-  mutation 'foo.at(n...-1)'
-  mutation 'foo.fetch(n...-1)'
-  mutation 'foo.key?(n...-1)'
-  mutation 'self[n...-1]'
-  mutation 'foo[nil]'
-  mutation 'foo[self]'
-  mutation 'foo[n...nil]'
-  mutation 'foo[n...self]'
-  mutation 'foo[n..-1]'
-  mutation 'foo[n...0]'
-  mutation 'foo[n...1]'
-  mutation 'foo[n...-2]'
-  mutation 'foo[nil...-1]'
-  mutation 'foo[self...-1]'
-end
-
-Mutant::Meta::Example.add :send do
-  source 'foo[n..-1]'
-
-  singleton_mutations
-  mutation 'n..-1'
-  mutation 'foo'
-  mutation 'foo[]'
-  mutation 'foo.at(n..-1)'
-  mutation 'foo.fetch(n..-1)'
-  mutation 'foo.key?(n..-1)'
-  mutation 'self[n..-1]'
-  mutation 'foo[nil]'
-  mutation 'foo[self]'
-  mutation 'foo[n..nil]'
-  mutation 'foo[n..self]'
-  mutation 'foo[n..0]'
-  mutation 'foo[n..1]'
-  mutation 'foo[n..-2]'
-  mutation 'foo[n...-1]'
-  mutation 'foo[nil..-1]'
-  mutation 'foo[self..-1]'
-  mutation 'foo.drop(n)'
-end
-
-Mutant::Meta::Example.add :send do
-  source 'self[foo]'
-
-  singleton_mutations
-  mutation 'self[self]'
-  mutation 'self[nil]'
-  mutation 'self[]'
-  mutation 'self.at(foo)'
-  mutation 'self.fetch(foo)'
-  mutation 'self.key?(foo)'
-  mutation 'foo'
-end
-
-Mutant::Meta::Example.add :send do
-  source 'foo[*bar]'
-
-  singleton_mutations
-  mutation 'foo'
-  mutation 'foo[]'
-  mutation 'foo.at(*bar)'
-  mutation 'foo.fetch(*bar)'
-  mutation 'foo.key?(*bar)'
-  mutation 'foo[nil]'
-  mutation 'foo[self]'
-  mutation 'foo[bar]'
-  mutation 'foo[*self]'
-  mutation 'foo[*nil]'
-  mutation 'self[*bar]'
-end
-
 (Mutant::AST::Types::BINARY_METHOD_OPERATORS - %i[=~ <= >= < > == != eql?]).each do |operator|
   Mutant::Meta::Example.add :send do
     source "true #{operator} false"

mutant.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency('parser',        '~> 2.5.1')
   gem.add_runtime_dependency('procto',        '~> 0.0.2')
   gem.add_runtime_dependency('regexp_parser', '~> 1.2')
-  gem.add_runtime_dependency('unparser',      '~> 0.3.0')
+  gem.add_runtime_dependency('unparser',      '~> 0.4.0')
 
   gem.add_development_dependency('devtools', '~> 0.1.22')
   gem.add_development_dependency('parallel', '~> 1.3')

spec/spec_helper.rb

@@ -44,7 +44,7 @@ module ParserHelper
   end
 
   def parse(string)
-    Unparser::Preprocessor.run(Parser::CurrentRuby.parse(string))
+    Unparser::Preprocessor.run(Unparser.parse(string))
   end
 
   def parse_expression(string)

spec/unit/mutant/ast/meta/send/proc_predicate_spec.rb

@@ -4,7 +4,7 @@ RSpec.describe Mutant::AST::Meta::Send, '#proc?' do
   subject { described_class.new(node).proc? }
 
   shared_context 'proc send' do |source|
-    let(:node) { Parser::CurrentRuby.parse(source).children.first }
+    let(:node) { Unparser.parse(source).children.first }
   end
 
   shared_examples 'proc definition' do |*args|

spec/unit/mutant/ast/meta/send/receiver_possible_top_level_const_predicate_spec.rb

@@ -4,7 +4,7 @@ RSpec.describe Mutant::AST::Meta::Send, '#receiver_possible_top_level_const?' do
   subject { described_class.new(node).receiver_possible_top_level_const? }
 
   def parse(source)
-    Parser::CurrentRuby.parse(source)
+    Unparser.parse(source)
   end
 
   context 'when implicit top level const' do

spec/unit/mutant/ast/meta/send_spec.rb

@@ -4,24 +4,22 @@ RSpec.describe Mutant::AST::Meta::Send do
   let(:object) { described_class.new(node) }
 
   def parse(source)
-    Parser::CurrentRuby.parse(source)
+    Unparser.parse(source)
   end
 
   let(:method_call)            { parse('foo.bar(baz)')  }
   let(:attribute_read)         { parse('foo.bar')       }
-  let(:index_assignment)       { parse('foo[0] = bar')  }
   let(:attribute_assignment)   { parse('foo.bar = baz') }
   let(:binary_method_operator) { parse('foo == bar')    }
 
   class Expectation
-    include Adamantium, Anima.new(:name, :assignment, :attribute_assignment, :index_assignment, :binary_method_operator)
+    include Adamantium, Anima.new(:name, :attribute_assignment, :binary_method_operator)
 
     ALL = [
-      [:method_call,            false, false, false, false],
-      [:attribute_read,         false, false, false, false],
-      [:index_assignment,       true,  false, true,  false],
-      [:attribute_assignment,   true,  true,  false, false],
-      [:binary_method_operator, false, false, false, true]
+      [:method_call,            false, false],
+      [:attribute_read,         false, false],
+      [:attribute_assignment,   true,  false],
+      [:binary_method_operator, false, true]
     ].map do |values|
       new(Hash[anima.attribute_names.zip(values)])
     end.freeze

spec/unit/mutant/subject_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe Mutant::Subject do
   let(:object) { class_under_test.new(context, node) }
 
   let(:node) do
-    Parser::CurrentRuby.parse(<<-RUBY)
+    Unparser.parse(<<-RUBY)
       def foo
       end
     RUBY