class RBS::Locator

# File rbs-2.1.0/lib/rbs/locator.rb, line 5
def initialize(decls:)
  @decls = decls
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 9
def buffer
  decls[0].location&.buffer or raise
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 13
def find(line:, column:)
  pos = buffer.loc_to_pos([line, column])

  decls.each do |decl|
    array = []
    find_in_decl(pos, decl: decl, array: array) and return array
  end

  []
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 24
def find2(line:, column:)
  path = find(line: line, column: column)

  return if path.empty?

  hd, *tl = path
  if hd.is_a?(Symbol)
    [hd, tl]
  else
    [nil, path]
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 37
def find_in_decl(pos, decl:, array:)
  if test_loc(pos, location: decl.location)
    array.unshift(decl)

    case decl
    when AST::Declarations::Class
      decl.type_params.each do |param|
        if test_loc(pos, location: param.location)
          array.unshift(param)
          find_in_loc(pos, array: array, location: param.location)
          return true
        end
      end

      if super_class = decl.super_class
        if test_loc(pos, location: super_class.location)
          array.unshift(super_class)
          find_in_loc(pos, array: array, location: super_class.location)
          return true
        end
      end

      decl.each_decl do |decl_|
        find_in_decl(pos, decl: decl_, array: array) and return true
      end

      decl.each_member do |member|
        find_in_member(pos, array: array, member: member) and return true
      end

    when AST::Declarations::Module
      decl.type_params.each do |param|
        if test_loc(pos, location: param.location)
          array.unshift(param)
          find_in_loc(pos, array: array, location: param.location)
          return true
        end
      end

      decl.self_types.each do |self_type|
        if test_loc(pos, location: self_type.location)
          array.unshift(self_type)
          find_in_loc(pos, array: array, location: self_type.location)
          return true
        end
      end

      decl.each_decl do |decl_|
        find_in_decl(pos, decl: decl_, array: array) and return true
      end

      decl.each_member do |member|
        find_in_member(pos, array: array, member: member) and return true
      end

    when AST::Declarations::Interface
      decl.type_params.each do |param|
        if test_loc(pos, location: param.location)
          array.unshift(param)
          find_in_loc(pos, array: array, location: param.location)
          return true
        end
      end

      decl.members.each do |member|
        find_in_member(pos, array: array, member: member) and return true
      end

    when AST::Declarations::Constant, AST::Declarations::Global
      find_in_type(pos, array: array, type: decl.type) and return true

    when AST::Declarations::Alias
      find_in_type(pos, array: array, type: decl.type) and return true
    end

    find_in_loc(pos, location: decl.location, array: array)

    true
  else
    false
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 173
def find_in_loc(pos, location:, array:)
  if test_loc(pos, location: location)
    if location.is_a?(Location)
      location.each_optional_key do |key|
        if loc = location[key]
          if loc.range === pos
            array.unshift(key)
            return true
          end
        end
      end

      location.each_required_key do |key|
        loc = location[key] or raise
        if loc.range === pos
          array.unshift(key)
          return true
        end
      end
    end

    true
  else
    false
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 120
def find_in_member(pos, member:, array:)
  if test_loc(pos, location: member.location)
    array.unshift(member)

    case member
    when AST::Members::MethodDefinition
      member.types.each do |method_type|
        find_in_method_type(pos, array: array, method_type: method_type) and return true
      end
    when AST::Members::InstanceVariable, AST::Members::ClassInstanceVariable, AST::Members::ClassVariable
      find_in_type(pos, array: array, type: member.type) and return true
    when AST::Members::AttrReader, AST::Members::AttrWriter, AST::Members::AttrAccessor
      find_in_type(pos, array: array, type: member.type) and return true
    end

    find_in_loc(pos, location: member.location, array: array)

    true
  else
    false
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 143
def find_in_method_type(pos, method_type:, array:)
  if test_loc(pos, location: method_type.location)
    array.unshift(method_type)

    method_type.each_type do |type|
      find_in_type(pos, array: array, type: type) and break
    end

    true
  else
    false
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 157
def find_in_type(pos, type:, array:)
  if test_loc(pos, location: type.location)
    array.unshift(type)

    type.each_type do |type_|
      find_in_type(pos, array: array, type: type_) and return true
    end

    find_in_loc(pos, array: array, location: type.location)

    true
  else
    false
  end
end

# File rbs-2.1.0/lib/rbs/locator.rb, line 200
def test_loc(pos, location:)
  if location
    location.range === pos
  else
    false
  end
end