Add TypeCompletor (YARP+RBS completion)

lib/irb/completion.rb

@@ -64,10 +64,27 @@ def self.retrieve_files_to_require_relative_from_current_dir
     end
 
     singleton_class.attr_accessor :completion_analyze_result
+    singleton_class.attr_reader :completion_method, :completor
 
-    def self.completor
-      require_relative 'completion/regexp_completor'
-      RegexpCompletor
+    def self.completion_method=(completion_method)
+      case completion_method
+      when :regexp
+        require_relative 'completion/regexp_completor'
+        @completor = RegexpCompletor
+      when :type
+        require_relative 'completion/type_completor'
+        @completor = TypeCompletor
+      else
+        raise ArgumentError
+      end
+      @completion_method = completion_method
+    end
+
+    # TODO: make it configurable
+    begin
+      self.completion_method = :type
+    rescue StandardError, LoadError
+      self.completion_method = :regexp
     end
 
     CompletionProc = lambda { |target, preposing = nil, postposing = nil|

lib/irb/completion/scope.rb

@@ -0,0 +1,318 @@
+require 'set'
+require_relative 'types'
+
+# TODO: rename module
+module KatakataIrb
+  class BaseScope
+    BREAK_RESULT = '%break'
+    NEXT_RESULT = '%next'
+    RETURN_RESULT = '%return'
+    PATTERNMATCH_BREAK = '%match'
+    RAISE_BREAK = '%raise'
+
+    attr_reader :module_nesting
+
+    def initialize(binding, self_object, local_variables)
+      @binding = binding
+      @self_object = self_object
+      @cache = {}
+      modules = [*binding.eval('Module.nesting'), Object]
+      @module_nesting = modules.map { [_1, []] }
+      binding_local_variables = binding.local_variables
+      uninitialized_locals = local_variables - binding_local_variables
+      uninitialized_locals.each { @cache[_1] = KatakataIrb::Types::NIL }
+      @local_variables = (local_variables | binding_local_variables).map(&:to_s).to_set
+      @global_variables = Kernel.global_variables.map(&:to_s).to_set
+      @owned_constants_cache = {}
+    end
+
+    def level() = 0
+
+    def level_of(_name) = 0
+
+    def mutable?() = false
+
+    def module_own_constant?(mod, name)
+      set = (@owned_constants_cache[mod] ||= Set.new(mod.constants.map(&:to_s)))
+      set.include? name
+    end
+
+    def get_const(nesting, path, _key = nil)
+      result = path.reduce nesting do |mod, name|
+        return nil unless mod.is_a?(Module) && module_own_constant?(mod, name)
+        mod.const_get name
+      end
+      KatakataIrb::Types.type_from_object result
+    end
+
+    def [](name)
+      @cache[name] ||= (
+        fallback = KatakataIrb::Types::NIL
+        case BaseScope.type_by_name name
+        when :cvar
+          BaseScope.type_of(fallback: fallback) { @self_object.class_variable_get name }
+        when :ivar
+          BaseScope.type_of(fallback: fallback) { @self_object.instance_variable_get name }
+        when :lvar
+          BaseScope.type_of(fallback: fallback) { @binding.local_variable_get(name) }
+        when :const
+          BaseScope.type_of(fallback: fallback) { @binding.eval name }
+        when :gvar
+          BaseScope.type_of(fallback: fallback) { @binding.eval name if @global_variables.include? name }
+        end
+      )
+    end
+
+    def self_type
+      KatakataIrb::Types.type_from_object @self_object
+    end
+
+    def local_variables() = @local_variables.to_a
+
+    def global_variables() = @global_variables.to_a
+
+    def self.type_of(fallback: KatakataIrb::Types::OBJECT)
+      begin
+        KatakataIrb::Types.type_from_object yield
+      rescue
+        fallback
+      end
+    end
+
+    def self.type_by_name(name)
+      if name.start_with? '@@'
+        :cvar
+      elsif name.start_with? '@'
+        :ivar
+      elsif name.start_with? '$'
+        :gvar
+      elsif name.start_with? '%'
+        :internal
+      elsif name[0].downcase != name[0]
+        :const
+      else
+        :lvar
+      end
+    end
+  end
+
+  class Scope < BaseScope
+    attr_reader :parent, :mergeable_changes, :level, :module_nesting
+
+    def self.from_binding(binding, locals) = new(BaseScope.new(binding, binding.eval('self'), locals))
+
+    def initialize(parent, table = {}, trace_cvar: true, trace_ivar: true, trace_lvar: true, self_type: nil, nesting: nil)
+      @parent = parent
+      @level = parent.level + 1
+      @trace_cvar = trace_cvar
+      @trace_ivar = trace_ivar
+      @trace_lvar = trace_lvar
+      @module_nesting = nesting ? [nesting, *parent.module_nesting] : parent.module_nesting
+      @self_type = self_type
+      @terminated = false
+      @jump_branches = []
+      @mergeable_changes = @table = table.transform_values { [level, _1] }
+    end
+
+    def mutable? = true
+
+    def terminated?
+      @terminated
+    end
+
+    def terminate_with(type, value)
+      return if terminated?
+      store_jump type, value, @mergeable_changes
+      terminate
+    end
+
+    def store_jump(type, value, changes)
+      return if terminated?
+      if has_own?(type)
+        changes[type] = [level, value]
+        @jump_branches << changes
+      elsif @parent.mutable?
+        @parent.store_jump(type, value, changes)
+      end
+    end
+
+    def terminate
+      return if terminated?
+      @terminated = true
+      @table = @mergeable_changes.dup
+    end
+
+    def trace?(name)
+      return false unless @parent
+      type = BaseScope.type_by_name(name)
+      type == :cvar ? @trace_cvar : type == :ivar ? @trace_ivar : type == :lvar ? @trace_lvar : true
+    end
+
+    def level_of(name)
+      variable_level, = @table[name]
+      variable_level || parent.level_of(name)
+    end
+
+    def get_const(nesting, path, key = nil)
+      key ||= [nesting.__id__, path].join('::')
+      _l, value = @table[key]
+      value || @parent.get_const(nesting, path, key)
+    end
+
+    def [](name)
+      if BaseScope.type_by_name(name) == :const
+        module_nesting.each do |(nesting, path)|
+          value = get_const nesting, [*path, name]
+          return value if value
+        end
+        KatakataIrb::Types::NIL
+      end
+      level, value = @table[name]
+      if level
+        value
+      elsif trace? name
+        @parent[name] if trace? name
+      end
+    end
+
+    def set_const(nesting, path, value)
+      key = [nesting.__id__, path].join('::')
+      @table[key] = [0, value]
+    end
+
+    def []=(name, value)
+      if BaseScope.type_by_name(name) == :const
+        parent_module, parent_path = module_nesting.first
+        set_const parent_module, [*parent_path, name], value
+        return
+      end
+      variable_level = level_of name
+      @table[name] = [variable_level, value] if variable_level
+    end
+
+    def self_type
+      @self_type || @parent.self_type
+    end
+
+    def global_variables
+      gvar_keys = @table.keys.select do |name|
+        BaseScope.type_by_name(name) == :gvar
+      end
+      gvar_keys | @parent.global_variables
+    end
+
+    def local_variables
+      lvar_keys = @table.keys.select do |name|
+        BaseScope.type_by_name(name) == :lvar
+      end
+      lvar_keys |= @parent.local_variables if @trace_lvar
+      lvar_keys
+    end
+
+    def table_constants
+      constants = module_nesting.flat_map do |mod, path|
+        prefix = [mod.__id__, *path].join('::') + '::'
+        @table.keys.select { _1.start_with? prefix }.map { _1.delete_prefix(prefix).split('::').first }
+      end.uniq
+      constants |= @parent.table_constants if @parent.mutable?
+      constants
+    end
+
+    def table_instance_variables
+      ivars = @table.keys.select { BaseScope.type_by_name(_1) == :ivar }
+      ivars |= @parent.table_instance_variables if @parent.mutable? && @trace_ivar
+      ivars
+    end
+
+    def instance_variables
+      self_singleton_types = self_type.types.grep(KatakataIrb::Types::SingletonType)
+      self_singleton_types.flat_map { _1.module_or_class.instance_variables } | table_instance_variables
+    end
+
+    def class_variables
+      cvars = @table.keys.select { BaseScope.type_by_name(_1) == :cvar }
+      cvars |= @parent.class_variables if @parent.mutable? && @trace_cvar
+      unless @trace_cvar
+        m = module_nesting.first
+        cvars |= m.class_variables if m.is_a? Module
+      end
+      cvars
+    end
+
+    def constants
+      module_nesting.flat_map do |nest,|
+        nest.constants
+      end.map(&:to_s) | table_constants
+    end
+
+    def merge_jumps
+      if terminated?
+        @terminated = false
+        @table = @mergeable_changes
+        merge @jump_branches
+        @terminated = true
+      else
+        merge [*@jump_branches, {}]
+      end
+    end
+
+    def conditional(&block)
+      run_branches(block, ->(_s) {}).first || KatakataIrb::Types::NIL
+    end
+
+    def never(&block)
+      block.call Scope.new(self, { BREAK_RESULT => nil, NEXT_RESULT => nil, PATTERNMATCH_BREAK => nil, RETURN_RESULT => nil, RAISE_BREAK => nil })
+    end
+
+    def run(*args, **option)
+      scope = Scope.new(self, *args, **option)
+      yield scope
+      merge_jumps
+      update scope
+    end
+
+    def run_branches(*blocks)
+      results = []
+      branches = []
+      blocks.each do |block|
+        scope = Scope.new self
+        result = block.call scope
+        next if scope.terminated?
+        results << result
+        branches << scope.mergeable_changes
+      end
+      terminate if branches.empty?
+      merge branches
+      results
+    end
+
+    def has_own?(name)
+      @table.key? name
+    end
+
+    def update(child_scope)
+      current_level = level
+      child_scope.mergeable_changes.each do |name, (level, value)|
+        self[name] = value if level <= current_level
+      end
+    end
+
+    protected
+
+    def merge(branches)
+      current_level = level
+      merge = {}
+      branches.each do |changes|
+        changes.each do |name, (level, value)|
+          next if current_level < level
+          (merge[name] ||= []) << value
+        end
+      end
+      merge.each do |name, values|
+        values << self[name] unless values.size == branches.size
+        values.compact!
+        self[name] = KatakataIrb::Types::UnionType[*values.compact] unless values.empty?
+      end
+    end
+  end
+end