refactor: Use Hash#fetch instead of Hash#[] to resolve type errors

lib/steep/expectations.rb

@@ -203,7 +203,7 @@ def to_yaml
       array = [] #: Array[{ "file" => String, "diagnostics" => Array[untyped] }]
 
       diagnostics.each_key.sort.each do |key|
-        ds = diagnostics[key]
+        ds = diagnostics.fetch(key)
         array << {
           "file" => key.to_s,
           'diagnostics' => ds.sort_by(&:sort_key).map(&:to_hash)

lib/steep/interface/shape.rb

@@ -125,7 +125,7 @@ def [](name)
           return nil unless key?(name)
 
           resolved_methods[name] ||= begin
-            entry = methods[name]
+            entry = methods.fetch(name)
             Entry.new(
               method_name: name,
               overloads: entry.overloads.map do |overload|

lib/steep/server/change_buffer.rb

@@ -46,7 +46,7 @@ def collect_changes(request)
 
             changes[path] ||= []
             request[:params][:contentChanges].each do |change|
-              changes[path] << Services::ContentChange.new(
+              changes.fetch(path) << Services::ContentChange.new(
                 range: change[:range]&.yield_self {|range|
                   [
                     range[:start].yield_self {|pos| Services::ContentChange::Position.new(line: pos[:line] + 1, column: pos[:character]) },

lib/steep/server/interaction_worker.rb

@@ -164,7 +164,7 @@ def process_completion(job)
             case
             when target = project.target_for_source_path(job.path)
               file = service.source_files[job.path] or return
-              subtyping = service.signature_services[target.name].current_subtyping or return
+              subtyping = service.signature_services.fetch(target.name).current_subtyping or return
 
               provider = Services::CompletionProvider.new(source_text: file.content, path: job.path, subtyping: subtyping)
               items = begin
@@ -193,12 +193,12 @@ def process_completion(job)
               case sig_service.status
               when Services::SignatureService::SyntaxErrorStatus, Services::SignatureService::AncestorErrorStatus
                 if buffer = sig_service.latest_env.buffers.find {|buf| Pathname(buf.name) == Pathname(relative_path) }
-                  dirs = sig_service.latest_env.signatures[buffer][0]
+                  dirs = sig_service.latest_env.signatures.fetch(buffer)[0]
                 else
                   dirs = [] #: Array[RBS::AST::Directives::t]
                 end
               else
-                signature = sig_service.files[relative_path].signature
+                signature = sig_service.files.fetch(relative_path).signature
                 signature.is_a?(Array) or raise
                 buffer, dirs, decls = signature
 
@@ -219,7 +219,7 @@ def process_completion(job)
                 end
               end
 
-              buffer = RBS::Buffer.new(name: relative_path, content: sig_service.files[relative_path].content)
+              buffer = RBS::Buffer.new(name: relative_path, content: sig_service.files.fetch(relative_path).content)
               prefix = Services::TypeNameCompletion::Prefix.parse(buffer, line: job.line, column: job.column)
 
               completion = Services::TypeNameCompletion.new(env: sig_service.latest_env, context: context, dirs: dirs)
@@ -460,7 +460,7 @@ def process_signature_help(job)
         Steep.logger.tagged("##{__method__}") do
           if target = project.target_for_source_path(job.path)
             file = service.source_files[job.path] or return
-            subtyping = service.signature_services[target.name].current_subtyping or return
+            subtyping = service.signature_services.fetch(target.name).current_subtyping or return
             source =
               Source.parse(file.content, path: file.path, factory: subtyping.factory)
                 .without_unrelated_defs(line: job.line, column: job.column)

lib/steep/server/type_check_worker.rb

@@ -222,7 +222,7 @@ def workspace_symbol_result(query)
         Steep.measure "Generating workspace symbol list for query=`#{query}`" do
           provider = Index::SignatureSymbolProvider.new(project: project, assignment: assignment)
           project.targets.each do |target|
-            index = service.signature_services[target.name].latest_rbs_index
+            index = service.signature_services.fetch(target.name).latest_rbs_index
             provider.indexes[target] = index
           end
 

lib/steep/services/completion_provider.rb

@@ -105,9 +105,9 @@ class TypeNameItem < Struct.new(:env, :absolute_type_name, :relative_type_name,
         def decl
           case
           when absolute_type_name.interface?
-            env.interface_decls[absolute_type_name].decl
+            env.interface_decls.fetch(absolute_type_name).decl
           when absolute_type_name.alias?
-            env.type_alias_decls[absolute_type_name].decl
+            env.type_alias_decls.fetch(absolute_type_name).decl
           when absolute_type_name.class?
             case entry = env.module_class_entry(absolute_type_name)
             when RBS::Environment::ClassEntry, RBS::Environment::ModuleEntry
@@ -127,11 +127,11 @@ def comments
 
           case
           when absolute_type_name.interface?
-            if comment = env.interface_decls[absolute_type_name].decl.comment
+            if comment = env.interface_decls.fetch(absolute_type_name).decl.comment
               comments << comment
             end
           when absolute_type_name.alias?
-            if comment = env.type_alias_decls[absolute_type_name].decl.comment
+            if comment = env.type_alias_decls.fetch(absolute_type_name).decl.comment
               comments << comment
             end
           when absolute_type_name.class?

lib/steep/services/goto_service.rb

@@ -97,7 +97,7 @@ def type_definition(path:, line:, column:)
         relative_path = project.relative_path(path)
 
         target = type_check.source_file?(relative_path) or return []
-        source = type_check.source_files[relative_path]
+        source = type_check.source_files.fetch(relative_path)
         typing, signature = type_check_path(target: target, path: relative_path, content: source.content, line: line, column: column)
 
         typing or return []
@@ -163,7 +163,7 @@ def query_at(path:, line:, column:)
 
         case
         when target = type_check.source_file?(relative_path)
-          source = type_check.source_files[relative_path]
+          source = type_check.source_files.fetch(relative_path)
           typing, _signature = type_check_path(target: target, path: relative_path, content: source.content, line: line, column: column)
           if typing
             node, *parents = typing.source.find_nodes(line: line, column: column)
@@ -284,7 +284,7 @@ def query_at(path:, line:, column:)
       end
 
       def type_check_path(target:, path:, content:, line:, column:)
-        signature_service = type_check.signature_services[target.name]
+        signature_service = type_check.signature_services.fetch(target.name)
         subtyping = signature_service.current_subtyping or return
         source = Source.parse(content, path: path, factory: subtyping.factory)
         source = source.without_unrelated_defs(line: line, column: column)

lib/steep/services/hover_provider/rbs.rb

@@ -17,7 +17,7 @@ def project
         end
 
         def content_for(target:, path:, line:, column:)
-          service = self.service.signature_services[target.name]
+          service = self.service.signature_services.fetch(target.name)
 
           env = service.latest_env
           buffer = env.buffers.find {|buf| buf.name.to_s == path.to_s } or return

lib/steep/services/hover_provider/ruby.rb

@@ -65,22 +65,22 @@ def project
         def method_definition_for(factory, type_name, singleton_method: nil, instance_method: nil)
           case
           when instance_method
-            factory.definition_builder.build_instance(type_name).methods[instance_method]
+            factory.definition_builder.build_instance(type_name).methods.fetch(instance_method)
           when singleton_method
             methods = factory.definition_builder.build_singleton(type_name).methods
 
             if singleton_method == :new
-              methods[:new] || methods[:initialize]
+              methods[:new] || methods.fetch(:initialize)
             else
-              methods[singleton_method]
+              methods.fetch(singleton_method)
             end
           else
             raise "One of the instance_method or singleton_method is required"
           end
         end
 
         def typecheck(target, path:, content:, line:, column:)
-          subtyping = service.signature_services[target.name].current_subtyping or return
+          subtyping = service.signature_services.fetch(target.name).current_subtyping or return
           source = Source.parse(content, path: path, factory: subtyping.factory)
           source = source.without_unrelated_defs(line: line, column: column)
           resolver = ::RBS::Resolver::ConstantResolver.new(builder: subtyping.factory.definition_builder)

lib/steep/services/type_check_service.rb

@@ -131,7 +131,7 @@ def signature_diagnostics
         signature_diagnostics = {}
 
         project.targets.each do |target|
-          service = signature_services[target.name]
+          service = signature_services.fetch(target.name)
 
           service.each_rbs_path do |path|
             signature_diagnostics[path] ||= []
@@ -142,13 +142,13 @@ def signature_diagnostics
             service.status.diagnostics.group_by {|diag| diag.location&.buffer&.name&.to_s }.each do |path_string, diagnostics|
               if path_string
                 path = Pathname(path_string)
-                signature_diagnostics[path].push(*diagnostics)
+                signature_diagnostics.fetch(path).push(*diagnostics)
               end
             end
           when SignatureService::LoadedStatus
             validation_diagnostics = signature_validation_diagnostics[target.name] || {}
             validation_diagnostics.each do |path, diagnostics|
-              signature_diagnostics[path].push(*diagnostics)
+              signature_diagnostics.fetch(path).push(*diagnostics)
             end
           end
         end
@@ -197,7 +197,7 @@ def update(changes:)
       def validate_signature(path:, target:)
         Steep.logger.tagged "#validate_signature(path=#{path})" do
           Steep.measure "validation" do
-            service = signature_services[target.name]
+            service = signature_services.fetch(target.name)
 
             raise unless target.possible_signature_file?(path) || service.env_rbs_paths.include?(path)
 
@@ -264,7 +264,7 @@ def validate_signature(path:, target:)
               end
             end
 
-            signature_validation_diagnostics[target.name][path] = diagnostics
+            signature_validation_diagnostics.fetch(target.name)[path] = diagnostics
           end
         end
       end
@@ -274,11 +274,11 @@ def typecheck_source(path:, target: project.target_for_source_path(path))
 
         Steep.logger.tagged "#typecheck_source(path=#{path})" do
           Steep.measure "typecheck" do
-            signature_service = signature_services[target.name]
+            signature_service = signature_services.fetch(target.name)
             subtyping = signature_service.current_subtyping
 
             if subtyping
-              text = source_files[path].content
+              text = source_files.fetch(path).content
               file = type_check_file(target: target, subtyping: subtyping, path: path, text: text) { signature_service.latest_constant_resolver }
               source_files[path] = file
 
@@ -291,11 +291,11 @@ def typecheck_source(path:, target: project.target_for_source_path(path))
       def update_signature(changes:, requests:)
         Steep.logger.tagged "#update_signature" do
           project.targets.each do |target|
-            signature_service = signature_services[target.name]
+            signature_service = signature_services.fetch(target.name)
             signature_changes = changes.filter {|path, _| target.possible_signature_file?(path) }
 
             unless signature_changes.empty?
-              requests[target].signature_updated!
+              requests.fetch(target).signature_updated!
               signature_service.update(signature_changes)
             end
           end
@@ -318,7 +318,7 @@ def update_sources(changes:, requests:)
             file = source_files[path] || SourceFile.no_data(path: path, content: "")
             content = changes.inject(file.content) {|text, change| change.apply_to(text) }
             source_files[path] = file.update_content(content)
-            requests[target].source_paths << path
+            requests.fetch(target).source_paths << path
           end
         end
       end

lib/steep/signature/validator.rb

@@ -130,7 +130,7 @@ def validate_type_application(type)
             ]
           when RBS::Types::Alias
             type_name = env.normalize_type_name?(type.name) or return
-            entry = env.type_alias_decls[type_name]
+            entry = env.type_alias_decls.fetch(type_name)
 
             [
               type_name,
@@ -485,7 +485,7 @@ def validate_ancestor_application(name, ancestor)
           location =
             case ancestor.source
             when :super
-              primary_decl = env.class_decls[name].primary.decl
+              primary_decl = env.class_decls.fetch(name).primary.decl
               primary_decl.is_a?(RBS::AST::Declarations::Class) or raise
               if super_class = primary_decl.super_class
                 super_class.location
@@ -594,7 +594,7 @@ def validate_one_global(name, entry)
         end
       end
 
-      def validate_one_alias(name, entry = env.type_alias_decls[name])
+      def validate_one_alias(name, entry = env.type_alias_decls.fetch(name))
         *, inner_most_outer_module = entry.outer
         if inner_most_outer_module
           class_type = AST::Types::Name::Singleton.new(name: inner_most_outer_module.name)

lib/steep/source.rb

@@ -88,7 +88,7 @@ def self.parse(source_code, path:, factory:)
 
       annotations.each do |annot|
         map[node] ||= []
-        map[node] << annot
+        map.fetch(node) << annot
       end
 
       ignores = comments.filter_map do |comment|
@@ -269,7 +269,7 @@ def self.construct_mapping(node:, annotations:, mapping:, line_range: nil)
 
       associated_annotations.each do |annot|
         mapping[node] ||= []
-        mapping[node] << annot
+        mapping.fetch(node) << annot
       end
 
       annotations.replace(other_annotations)
@@ -442,7 +442,7 @@ def without_unrelated_defs(line:, column:)
 
         annotations.each do |annot|
           mapping[node_] ||= []
-          mapping[node_] << annot
+          mapping.fetch(node_) << annot
         end
 
         Source.new(buffer: buffer, path: path, node: node_, mapping: mapping, comments: comments, ignores: ignores)

lib/steep/subtyping/check.rb

@@ -1057,10 +1057,10 @@ def match_params(name, relation)
 
         sup_flat_kws.each do |name, _|
           if sub_flat_kws.key?(name)
-            pairs << [sub_flat_kws[name], sup_flat_kws[name]]
+            pairs << [sub_flat_kws.fetch(name), sup_flat_kws.fetch(name)]
           else
             if sub_params.rest_keywords
-              pairs << [sub_params.rest_keywords, sup_flat_kws[name]]
+              pairs << [sub_params.rest_keywords, sup_flat_kws.fetch(name)]
             else
               return failure
             end

lib/steep/subtyping/constraints.rb

@@ -102,7 +102,7 @@ def add_var(*vars)
       end
 
       def add(var, sub_type: nil, super_type: nil, skip: false)
-        subs, supers, skips = dictionary[var]
+        subs, supers, skips = dictionary.fetch(var)
 
         if sub_type.is_a?(AST::Types::Logic::Base)
           sub_type = AST::Builtin.bool_type
@@ -204,7 +204,7 @@ def upper_bound(var, skip: false)
         if skip
           upper_bound = upper_bound_types(var)
         else
-          _, upper_bound, _ = dictionary[var]
+          _, upper_bound, _ = dictionary.fetch(var)
         end
 
         case upper_bound.size
@@ -320,12 +320,12 @@ def to_s
       end
 
       def lower_bound_types(var_name)
-        lower, _, _ = dictionary[var_name]
+        lower, _, _ = dictionary.fetch(var_name)
         lower
       end
 
       def upper_bound_types(var_name)
-        _, upper, skips = dictionary[var_name]
+        _, upper, skips = dictionary.fetch(var_name)
 
         case
         when upper.empty?