Module: MilkTea::LSP::Server::ServerSemanticTokens

Included in:
MilkTea::LSP::Server
Defined in:
lib/milk_tea/lsp/server/semantic_tokens.rb

Instance Method Summary collapse

Instance Method Details

#bare_builtin_specialization?(name, tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1025

def bare_builtin_specialization?(name, tokens, index)
  return false unless name == 'zero' || name == 'default'

  next_index = next_non_trivia_token_index(tokens, index + 1)
  return false unless next_index && tokens[next_index].type == :lbracket

  rbracket_index = matching_closer_index(tokens, next_index, :lbracket, :rbracket)
  return false unless rbracket_index

  after_bracket_index = next_non_trivia_token_index(tokens, rbracket_index + 1)
  after_bracket_index.nil? || tokens[after_bracket_index].type != :lparen
end

#bare_function_value_identifier_site?(facts, token) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1038

def bare_function_value_identifier_site?(facts, token)
  facts.functions.key?(token.lexeme) &&
    facts.callable_value_identifier_sites.fetch([token.line, token.column], false)
end

#build_attribute_name_semantic_overrides(tokens, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1462

def build_attribute_name_semantic_overrides(tokens, facts)
  return {} unless facts&.respond_to?(:ast) && facts.ast

  token_indices_by_position = tokens.each_with_index.each_with_object({}) do |(token, index), positions|
    positions[[token.line, token.column]] = index
  end
  overrides = {}

  walk_ast_nodes(facts.ast) do |node|
    case node
    when AST::AttributeDecl
      mark_attribute_name_override(
        overrides,
        token_indices_by_position,
        tokens,
        [node.name],
        line: node.line,
        column: node.column,
        declaration: true,
      )
    when AST::AttributeApplication
      mark_attribute_name_override(
        overrides,
        token_indices_by_position,
        tokens,
        node.name.parts,
        line: node.line,
        column: node.column,
      )
    when AST::Call
      mark_attribute_reflection_name_overrides(overrides, token_indices_by_position, tokens, node)
    end
  end

  overrides
end

#build_semantic_token_entries(tokens, facts = nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 127

def build_semantic_token_entries(tokens, facts = nil)
  # Precompute line → non-trivia tokens index so non_trivia_tokens_on_line
  # is O(1) per call instead of O(n), turning the overall build from O(n²) to O(n).
  trivia_types = Set[:newline, :indent, :dedent, :eof]
  @tokens_by_line_cache = Hash.new { |h, k| h[k] = [] }
  tokens.each { |t| @tokens_by_line_cache[t.line] << t unless trivia_types.include?(t.type) }
  @attribute_name_semantic_overrides = build_attribute_name_semantic_overrides(tokens, facts)

  entries = []

  tokens.each_with_index do |tok, index|
    next if [:newline, :indent, :dedent, :eof].include?(tok.type)

    if tok.type == :fstring
      next if embedded_heredoc_token?(tok)
      fstring_interpolation_entries(tok, facts).each { |e| entries << e }
      next
    end

    semantic_type, modifiers = classify_semantic_token(tokens, index, facts)
    next unless semantic_type

    token_semantic_entries(tok, semantic_type, modifiers).each { |entry| entries << entry }
  end

  entries.sort_by { |entry| [entry[:line], entry[:start_char]] }
ensure
  @tokens_by_line_cache = nil
  @attribute_name_semantic_overrides = nil
end

#callable_field_member_access?(name, tokens, index, facts) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 946

def callable_field_member_access?(name, tokens, index, facts)
  next_tok = next_non_trivia_token(tokens, index + 1)
  return false unless next_tok&.type == :lparen

  dot_index = previous_non_trivia_token_index(tokens, index)
  return false unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return false unless receiver_index

  receiver_tok = tokens[receiver_index]
  return false unless receiver_tok.type == :identifier

  resolve_receiver_value_type(facts, receiver_tok).then do |receiver_type|
    next false unless receiver_type

    field_receiver_type = project_field_receiver_type_for_completion(receiver_type, facts)
    next false unless field_receiver_type.respond_to?(:field)

    callable_semantic_type?(field_receiver_type.field(name))
  end
end

#callable_parameter_declaration_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 630

def callable_parameter_declaration_token?(tokens, index)
  return false unless parameter_declaration_token?(tokens, index)

  opener_index = parameter_list_opener_index(tokens, index)
  return false unless opener_index

  head_index = previous_non_trivia_token_index(tokens, opener_index)
  return false unless head_index

  head = tokens[head_index]
  return true if [:fn, :proc].include?(head.type)

  if head.type == :rbracket
    lbracket_index = matching_opener_index(tokens, head_index)
    return false unless lbracket_index

    head_index = previous_non_trivia_token_index(tokens, lbracket_index)
    return false unless head_index

    head = tokens[head_index]
  end

  return false unless head.type == :identifier

  previous_non_trivia_token(tokens, head_index)&.type == :function
end

#callable_semantic_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 980

def callable_semantic_type?(type)
  type.is_a?(Types::Function) || type.is_a?(Types::Proc)
end

#classify_name_semantic(name, tokens, index, facts = nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 311

def classify_name_semantic(name, tokens, index, facts = nil)
  tok = tokens[index]
  prev_tok = previous_non_trivia_token(tokens, index)
  next_tok = next_non_trivia_token(tokens, index + 1)
  parameter_declaration = parameter_declaration_token?(tokens, index)
  user_defined_function = facts ? facts.functions.key?(name) : lexically_declared_free_function_name?(tokens, name)

  if @attribute_name_semantic_overrides && (override = @attribute_name_semantic_overrides[[tok.line, tok.column]])
    return override
  end

  if (import_info = import_path_info_at(tokens, index, allow_keywords: true))
    modifiers = []
    modifiers << 'declaration' if import_info[:role] == :alias
    return [:namespace, modifiers]
  end

  return [:namespace, []] if module_declaration_path_token?(tokens, index, allow_keywords: true)

  if prev_tok && [:function, :fn, :proc].include?(prev_tok.type)
    return [:function, ['declaration']]
  end

  if prev_tok && [:struct, :union, :enum, :flags, :variant, :type, :opaque, :interface].include?(prev_tok.type)
    return [:type, ['declaration']]
  end

  return [:variable, []] if name == "_"

  if prev_tok&.type == :event
    return struct_event_declaration_token?(tokens, index) ? [:property, ['declaration']] : [:variable, ['declaration']]
  end

  if prev_tok&.type == :const
    return [:variable, ['declaration', 'readonly']]
  end

  if prev_tok&.type == :let
    return [:variable, ['declaration', 'readonly']] unless next_tok&.type == :lparen
  end

  if prev_tok&.type == :var
    return [:variable, ['declaration']] unless next_tok&.type == :lparen
  end

  if prev_tok&.type == :for
    return [:variable, ['declaration', 'readonly']]
  end

  return [:variable, ['declaration', 'readonly']] if match_arm_binding_token?(tokens, index)
  return [:parameter, ['declaration']] if callable_parameter_declaration_token?(tokens, index)
  return [:property, ['declaration']] if variant_payload_field_declaration_token?(tokens, index)
  return [:property, ['declaration']] if field_declaration_token?(tokens, index)

  if destructure_let_binding?(tokens, index)
    return [:variable, ['declaration', 'readonly']]
  end

  if facts
    return [:typeParameter, ['declaration']] if type_parameter_declaration_token?(facts, tokens, index)
    return [:typeParameter, []] if type_parameter_reference_token?(facts, tokens, index)
  end

  return [:property, []] if named_argument_label_token?(tokens, index) && named_argument_label_in_type_constructor?(tokens, index, facts)
  return [:parameter, []] if named_argument_label_token?(tokens, index)

  if facts && prev_tok&.type != :dot && (generic_binding = generic_function_lexical_binding_semantic(facts, tok))
    return generic_binding
  end

  if next_tok&.type == :dot && facts
    return [:type, []] if known_type_name?(facts, name)
    return [:type, []] if facts.interfaces.key?(name)
    return [:namespace, []] if facts.imports.key?(name)

    if (binding = local_semantic_value_binding(facts, tok, allow_same_line_future: parameter_declaration))
      return semantic_value_binding_entry(binding, declaration: binding.kind == :param && parameter_declaration)
    end

    if (binding = facts.values[name])
      return semantic_value_binding_entry(binding)
    end
  end

  if facts && (known_type_name?(facts, name) || facts.interfaces.key?(name)) && identifier_in_type_argument_position?(tokens, index)
    return [:type, []]
  end

  return [:enumMember, ['declaration']] if variant_enum_member_declaration?(tokens, index)

  if prev_tok&.type == :dot
    if facts
      module_binding = imported_module_binding_for_member(tokens, index, facts)
      if module_binding
        if module_binding.functions.key?(name)
          return [:function, []] if next_tok&.type == :lparen || specialized_call_with_type_args?(tokens, index)
          return [:function, []] if next_tok&.type == :lbracket
          return [:function, []] if imported_module_function_value_member_access_site?(facts, tokens, index)
          return [:property, []]
        end
        return [:type, []] if module_binding.types.key?(name)
        return [:type, []] if module_binding.interfaces.key?(name)
        if (value_binding = module_binding.values[name])
          modifiers = []
          modifiers << 'readonly' if value_binding.respond_to?(:mutable) && value_binding.mutable == false
          return [:variable, modifiers]
        end
        return [:namespace, []] if facts.imports.key?(name)
      end

      return [:type, []] if dot_nested_type_member?(tokens, index, facts)
      return [:property, []] if callable_field_member_access?(name, tokens, index, facts)
      return [:method, []] if static_type_member_access?(tokens, index, facts)
    end

    return [:enumMember, []] if type_name_member_access?(tokens, index, facts)
    return [:method, []] if next_tok&.type == :lparen || specialized_call_with_type_args?(tokens, index)
    return [:property, []]
  end

  if next_tok&.type == :lparen || specialized_call_with_type_args?(tokens, index)
    if facts && (resolved = resolved_call_callee_semantic(name, tok, parameter_declaration, facts))
      return resolved
    end

    return [:function, []] if user_defined_function

    modifiers = []
    modifiers << 'defaultLibrary' if BUILTIN_FUNCTION_NAMES.include?(name)
    if BUILTIN_ASSOCIATED_HOOK_NAMES.include?(name) && specialized_call_with_type_args?(tokens, index) && !user_defined_function
      modifiers << 'defaultLibrary'
    end
    return [:function, modifiers]
  end

  return [:function, []] if next_tok&.type == :lbracket && user_defined_function

  if facts && identifier_in_type_reference_position?(tokens, index)
    if known_type_name?(facts, name)
      modifiers = []
      modifiers << 'defaultLibrary' if DEFAULT_LIBRARY_TYPE_NAMES.include?(name)
      return [:type, modifiers]
    end
    return [:type, []] if facts.interfaces.key?(name)

    if DEFAULT_LIBRARY_TYPE_NAMES.include?(name)
      return [:type, ['defaultLibrary']]
    end
  end

  if facts

    if (binding = local_semantic_value_binding(facts, tok, allow_same_line_future: parameter_declaration))
      return semantic_value_binding_entry(binding, declaration: binding.kind == :param && parameter_declaration)
    end

    if known_type_name?(facts, name)
      modifiers = []
      modifiers << 'defaultLibrary' if DEFAULT_LIBRARY_TYPE_NAMES.include?(name)
      return [:type, modifiers]
    end
    return [:type, []] if facts.interfaces.key?(name)

    return [:namespace, []] if facts.imports.key?(name)

    if (binding = facts.values[name])
      return semantic_value_binding_entry(binding)
    end

    return [:function, []] if bare_function_value_identifier_site?(facts, tok)
  end

  if DEFAULT_LIBRARY_TYPE_NAMES.include?(name)
    return [:type, ['defaultLibrary']]
  end

  return [:function, ['defaultLibrary']] if bare_builtin_specialization?(name, tokens, index)

  [:variable, []]
end

#classify_semantic_token(tokens, index, facts = nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 256

def classify_semantic_token(tokens, index, facts = nil)
  tok = tokens[index]

  if tok.type == :identifier || namespace_keyword_token?(tokens, index)
    return classify_name_semantic(tok.lexeme, tokens, index, facts)
  end

  if [:string, :cstring].include?(tok.type)
    return [nil, []] if embedded_heredoc_token?(tok)

    return [:string, []]
  end

  if tok.type == :comment
    return [:comment, []]
  end

  if [:integer, :float].include?(tok.type)
    return [:number, []]
  end

  if KEYWORD_TOKEN_TYPES.include?(tok.type)
    return [:keyword, []]
  end

  if OPERATOR_TOKEN_TYPES.include?(tok.type)
    return [:operator, []]
  end

  [nil, []]
end

#collect_generic_function_local_scopes(statements, current_bindings, block_end_line, scopes) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 800

def collect_generic_function_local_scopes(statements, current_bindings, block_end_line, scopes)
  active_bindings = current_bindings.dup
  Array(statements).each do |statement|
    case statement
    when AST::LocalDecl
      active_bindings[statement.name] = statement.kind == :var ? :var : :let
      scopes << generic_binding_scope(statement, active_bindings, block_end_line)
    when AST::IfStmt
      Array(statement.branches).each do |branch|
        branch_body = Array(branch.body)
        branch_end_line = generic_statement_list_end_line(branch_body, statement.line)
        collect_generic_function_local_scopes(branch_body, active_bindings, branch_end_line, scopes)
      end

      else_body = Array(statement.else_body)
      unless else_body.empty?
        else_end_line = generic_statement_list_end_line(else_body, statement.line)
        collect_generic_function_local_scopes(else_body, active_bindings, else_end_line, scopes)
      end
    when AST::MatchStmt
      Array(statement.arms).each do |arm|
        arm_bindings = active_bindings.dup
        arm_body = Array(arm.body)
        arm_end_line = generic_statement_list_end_line(arm_body, statement.line)
        if arm.respond_to?(:binding_name) && arm.binding_name
          arm_bindings[arm.binding_name] = :let
          scopes << generic_binding_scope(arm, arm_bindings, arm_end_line)
        end
        collect_generic_function_local_scopes(arm_body, arm_bindings, arm_end_line, scopes)
      end
    when AST::UnsafeStmt, AST::WhileStmt, AST::DeferStmt
      body = Array(statement.body)
      body_end_line = generic_statement_list_end_line(body, statement.line)
      collect_generic_function_local_scopes(body, active_bindings, body_end_line, scopes)
    when AST::ForStmt
      next unless statement.respond_to?(:name) && statement.name

      body = Array(statement.body)
      body_end_line = generic_statement_list_end_line(body, statement.line)
      for_bindings = active_bindings.dup
      for_bindings[statement.name] = :let
      scopes << generic_binding_scope(statement, for_bindings, body_end_line)
      collect_generic_function_local_scopes(body, for_bindings, body_end_line, scopes)
    end
  end
end

#compute_semantic_tokens_edits(old_entries, new_entries) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1663

def compute_semantic_tokens_edits(old_entries, new_entries)
  return [] if old_entries == new_entries

  prefix = find_semantic_token_common_prefix(old_entries, new_entries)
  suffix = find_semantic_token_common_suffix(old_entries, new_entries, prefix)

  old_mid = old_entries.length - prefix - suffix
  new_mid = new_entries.length - prefix - suffix

  if old_mid.zero? && new_mid.zero?
    return []
  end

  start_offset = prefix * 5
  delete_count = old_mid * 5
  insert_tokens = encode_semantic_tokens(new_entries[prefix...(new_entries.length - suffix)])

  [{ start: start_offset, deleteCount: delete_count, data: insert_tokens }]
end

#constructible_semantic_type?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1021

def constructible_semantic_type?(type)
  type.is_a?(Types::Struct) || type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::StringView) || type.is_a?(Types::Task) || type.is_a?(Types::Vector) || type.is_a?(Types::Matrix) || type.is_a?(Types::Quaternion)
end

#declaration_scope_end_line(decls, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1322

def declaration_scope_end_line(decls, index)
  nested_declaration_scope_end_line(decls, index, fallback_end_line: Float::INFINITY)
end

#destructure_let_binding?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 553

def destructure_let_binding?(tokens, index)
  tok = tokens[index]
  return false unless tok&.type == :identifier

  line_tokens = non_trivia_tokens_on_line(tokens, tok.line)
  return false unless line_tokens.length >= 3

  first = line_tokens[0]
  return false unless [:let, :var].include?(first.type)

  eq_idx = line_tokens.index { |t| t.type == :equal }
  lparen_idx = line_tokens.index { |t| t.type == :lparen }
  return false unless lparen_idx

  return false if eq_idx && lparen_idx >= eq_idx

  # let (a, b) = ...
  if line_tokens[1]&.type == :lparen
    return first.type == :let
  end

  # let Vec2(x, y) = ... — identifier then lparen adjacency
  return false unless line_tokens[1]&.type == :identifier && lparen_idx == 2

  first.type == :let
end

#dot_nested_type_member?(tokens, index, facts) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 993

def dot_nested_type_member?(tokens, index, facts)
  return false unless facts

  dot_index = index - 1
  return false unless dot_index >= 0 && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return false unless receiver_index && tokens[receiver_index].type == :identifier

  receiver_name = tokens[receiver_index].lexeme
  type = resolve_struct_type_name(facts, receiver_name)
  return false unless type.is_a?(Types::Struct)

  member_name = tokens[index].lexeme
  type.nested_types.key?(member_name)
end

#dot_type_receiver_info(tokens, index, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1079

def dot_type_receiver_info(tokens, index, facts)
  dot_index = previous_non_trivia_token_index(tokens, index)
  return nil unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return nil unless receiver_index

  if tokens[receiver_index].type == :rbracket
    lbracket_index = matching_opener_index(tokens, receiver_index)
    return nil unless lbracket_index

    receiver_index = previous_non_trivia_token_index(tokens, lbracket_index)
    return nil unless receiver_index
  end

  receiver = tokens[receiver_index]
  return nil unless receiver.type == :identifier

  receiver_name = receiver.lexeme
  receiver_path = receiver_name

  module_dot_index = previous_non_trivia_token_index(tokens, receiver_index)
  if module_dot_index && tokens[module_dot_index].type == :dot
    module_index = previous_non_trivia_token_index(tokens, module_dot_index)
    return nil unless module_index && tokens[module_index].type == :identifier

    receiver_path = "#{tokens[module_index].lexeme}.#{receiver_name}"
  end

  resolve_type_receiver_info(facts, receiver_name, receiver_path)
end

#embedded_heredoc_token?(token) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 288

def embedded_heredoc_token?(token)
  return false unless [:string, :cstring, :fstring].include?(token.type)

  tag = token.lexeme[/\A(?:f|c)?<<-([A-Za-z_][A-Za-z0-9_]*)[ \t]*\n/, 1]
  return false if tag.nil?

  %w[GLSL VERT FRAG COMP JSON JSONC SQL HTML MT].include?(tag)
end

#encode_semantic_tokens(entries) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1633

def encode_semantic_tokens(entries)
  data = []
  prev_line = 0
  prev_char = 0

  entries.each do |entry|
    delta_line = entry[:line] - prev_line
    delta_start = delta_line.zero? ? entry[:start_char] - prev_char : entry[:start_char]
    type_index = SEMANTIC_TOKEN_TYPES.index(entry[:type].to_s) || 0
    modifiers_bitset = semantic_modifiers_bitset(entry[:modifiers])

    data << delta_line
    data << delta_start
    data << entry[:length]
    data << type_index
    data << modifiers_bitset

    prev_line = entry[:line]
    prev_char = entry[:start_char]
  end

  data
end

#field_declaration_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 542

def field_declaration_token?(tokens, index)
  tok = tokens[index]
  return false unless tok&.type == :identifier
  return false unless first_non_trivia_token_on_line?(tokens, index)
  return false if parameter_declaration_token?(tokens, index)
  return false if match_arm_binding_token?(tokens, index)

  next_tok = next_non_trivia_token(tokens, index + 1)
  next_tok&.type == :colon
end

#find_semantic_token_common_prefix(old_entries, new_entries) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1683

def find_semantic_token_common_prefix(old_entries, new_entries)
  limit = [old_entries.length, new_entries.length].min
  prefix = 0
  while prefix < limit && semantic_token_entry_equal?(old_entries[prefix], new_entries[prefix])
    prefix += 1
  end
  prefix
end

#find_semantic_token_common_suffix(old_entries, new_entries, prefix) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1692

def find_semantic_token_common_suffix(old_entries, new_entries, prefix)
  old_limit = old_entries.length - prefix
  new_limit = new_entries.length - prefix
  limit = [old_limit, new_limit].min
  suffix = 0
  while suffix < limit &&
        semantic_token_entry_equal?(old_entries[old_entries.length - 1 - suffix],
                                    new_entries[new_entries.length - 1 - suffix])
    suffix += 1
  end
  suffix
end

#first_non_trivia_token_on_line?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1597

def first_non_trivia_token_on_line?(tokens, index)
  token = tokens[index]
  return false unless token

  i = index - 1
  while i >= 0
    previous = tokens[i]
    return true if previous.type == :newline
    return false if previous.line == token.line && ![:indent, :dedent].include?(previous.type)

    i -= 1
  end

  true
end

#fstring_interpolation_entries(fstring_tok, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 158

def fstring_interpolation_entries(fstring_tok, facts)
  parts = fstring_tok.literal
  return [{ line: fstring_tok.line - 1, start_char: fstring_tok.column - 1, length: fstring_tok.lexeme.length, type: :string, modifiers: [] }] unless parts.is_a?(Array)

  result = []
  fstr_line = fstring_tok.line - 1   # 0-indexed
  fstr_col0 = fstring_tok.column - 1 # 0-indexed start of `f`
  cursor = fstr_col0

  parts.each do |part|
    next unless part[:kind] == :expr

    # part[:column] is 1-indexed column of the first char of the expression source
    # (i.e. the char right after `#{`).
    expr_col0  = part[:column] - 1          # 0-indexed
    hash_col0  = expr_col0 - 2              # 0-indexed position of `#`

    raw_len       = part[:source].length + (part[:format_spec] ? 1 + part[:format_spec].length : 0)
    rbrace_col0   = expr_col0 + raw_len     # 0-indexed position of `}`

    # :string for everything from cursor up to (but not including) `#`
    text_len = hash_col0 - cursor
    result << { line: fstr_line, start_char: cursor, length: text_len, type: :string, modifiers: [] } if text_len > 0

    # classified entries for the expression source only (not format spec).
    source = part[:source]
    unless source.nil? || source.strip.empty?
      begin
        sub_tokens = interpolation_expression_tokens(part)
        sub_tokens.each_with_index do |sub_tok, i|
          sem_type, modifiers = classify_semantic_token(sub_tokens, i, facts)
          next unless sem_type
          result << {
            line: sub_tok.line - 1,
            start_char: sub_tok.column - 1,
            length: sub_tok.lexeme.length,
            type: sem_type,
            modifiers: modifiers
          }
        end
      rescue MilkTea::LexError
        # Fall back to string coloring for malformed expression.
        result << {
          line: fstr_line,
          start_char: expr_col0,
          length: source.length,
          type: :string,
          modifiers: [],
        }
      end
    end

    # classified entries for format spec (if present), excluding the
    # delimiter token so TextMate interpolation punctuation can style it.
    if part[:format_spec]
      spec_col0 = expr_col0 + source.length
      # Format spec content (e.g., ".0", "3", ".5f") as individual token-like entries.
      # Treat it as lexable content or just string for simplicity.
      spec = part[:format_spec]
      unless spec.empty?
        begin
          spec_tokens = MilkTea::Lexer.new(spec).lex
                                    .reject { |t| [:newline, :indent, :dedent, :eof].include?(t.type) }
          spec_tokens.each_with_index do |spec_tok, i|
            spec_sem_type, spec_modifiers = classify_semantic_token(spec_tokens, i, facts)
            next unless spec_sem_type
            result << {
              line: fstr_line,
              start_char: spec_col0 + 1 + (spec_tok.column - 1),
              length: spec_tok.lexeme.length,
              type: spec_sem_type,
              modifiers: spec_modifiers
            }
          end
        rescue MilkTea::LexError
          # Fall back: treat spec as a number/string token.
          result << {
            line: fstr_line,
            start_char: spec_col0 + 1,
            length: spec.length,
            type: :number,
            modifiers: []
          }
        end
      end
    end

    cursor = rbrace_col0 + 1
  end

  # :string for tail text + closing `"`
  fstr_end_col0 = fstr_col0 + fstring_tok.lexeme.length - 1
  tail_len = fstr_end_col0 - cursor + 1
  result << { line: fstr_line, start_char: cursor, length: tail_len, type: :string, modifiers: [] } if tail_len > 0

  result
end

#generic_binding_scope(node, bindings, end_line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 847

def generic_binding_scope(node, bindings, end_line)
  {
    start_line: node.line ? node.line : 0,
    start_column: node.column ? node.column : 0,
    end_line: end_line,
    bindings: bindings.dup,
  }
end

#generic_callable_lexical_scopes(decl, end_line:, include_receiver: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 768

def generic_callable_lexical_scopes(decl, end_line:, include_receiver: false)
  scopes = []
  current_bindings = {}
  current_bindings['this'] = :param if include_receiver
  Array(decl.params).each do |param|
    next unless param.respond_to?(:name)

    current_bindings[param.name] = :param
  end

  unless current_bindings.empty?
    scopes << {
      start_line: decl.line,
      start_column: 0,
      end_line: end_line,
      bindings: current_bindings.dup,
    }
  end

  collect_generic_function_local_scopes(Array(decl.body), current_bindings, end_line, scopes)

  scopes
end

#generic_function_binding_for_line(facts, line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1724

def generic_function_binding_for_line(facts, line)
  generic_function_bindings(facts).filter_map do |binding|
    next unless binding.ast.respond_to?(:body) && binding.ast.line

    start_line = binding.ast.line
    end_line = generic_statement_list_end_line(Array(binding.ast.body), start_line)
    next unless start_line <= line && line <= end_line

    [end_line - start_line, -start_line, binding]
  end.min_by { |span, start_line, _binding| [span, start_line] }&.last
end

#generic_function_bindings(facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1736

def generic_function_bindings(facts)
  facts.functions.each_value.select { |binding| binding.type_params.any? } +
    facts.methods.each_value.flat_map(&:values).select { |binding| binding.type_params.any? }
end

#generic_function_declaration?(decl) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 792

def generic_function_declaration?(decl)
  decl.respond_to?(:type_params) &&
    Array(decl.type_params).any? &&
    decl.respond_to?(:params) &&
    decl.respond_to?(:body) &&
    !decl.body.nil?
end

#generic_function_lexical_binding_kind_at(facts, line, column, name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 710

def generic_function_lexical_binding_kind_at(facts, line, column, name)
  generic_function_lexical_binding_scopes(facts).reverse_each do |scope|
    next if line < scope[:start_line] || line > scope[:end_line]
    next if line == scope[:start_line] && column < scope[:start_column]

    kind = scope[:bindings][name]
    return kind if kind
  end

  nil
end

#generic_function_lexical_binding_scopes(facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 722

def generic_function_lexical_binding_scopes(facts)
  scopes = @generic_function_lexical_binding_scope_cache ||= {}
  cached = scopes[facts.object_id]
  unless cached
    decls = Array(facts.ast&.declarations)
    cached = decls.each_with_index.flat_map do |decl, index|
      generic_function_lexical_scopes_for_declaration(
        decl,
        end_line: declaration_scope_end_line(decls, index),
      )
    end
    scopes[facts.object_id] = cached
  end

  cached
end

#generic_function_lexical_binding_semantic(facts, token) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 698

def generic_function_lexical_binding_semantic(facts, token)
  kind = generic_function_lexical_binding_kind_at(facts, token.line, token.column, token.lexeme)
  case kind
  when :param
    [:parameter, []]
  when :variable
    [:variable, []]
  else
    nil
  end
end

#generic_function_lexical_scopes_for_declaration(decl, end_line: Float::INFINITY) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 739

def generic_function_lexical_scopes_for_declaration(decl, end_line: Float::INFINITY)
  if decl.is_a?(AST::ExtendingBlock)
    receiver_type_params = generic_type_parameter_names_for_extending_block(decl)
    methods = Array(decl.methods)
    return methods.each_with_index.flat_map do |method, index|
      generic_method_lexical_scopes(
        method,
        receiver_type_params: receiver_type_params,
        end_line: nested_declaration_scope_end_line(methods, index, fallback_end_line: end_line),
      )
    end
  end

  return [] unless generic_function_declaration?(decl)

  generic_callable_lexical_scopes(decl, end_line: generic_statement_list_end_line(decl.body, decl.line))
end

#generic_method_lexical_scopes(method, receiver_type_params:, end_line:) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 757

def generic_method_lexical_scopes(method, receiver_type_params:, end_line:)
  return [] unless method.respond_to?(:body) && !method.body.nil?
  return [] if receiver_type_params.empty? && Array(method.type_params).empty?

  generic_callable_lexical_scopes(
    method,
    end_line:,
    include_receiver: method.respond_to?(:kind) && method.kind != :static,
  )
end

#generic_statement_end_line(statement) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 862

def generic_statement_end_line(statement)
  return 0 unless statement

  case statement
  when AST::IfStmt
    branch_lines = Array(statement.branches).map do |branch|
      generic_statement_list_end_line(Array(branch.body), branch.line || statement.line)
    end
    else_line = generic_statement_list_end_line(Array(statement.else_body), statement.line)
    ([statement.line, else_line] + branch_lines).compact.max
  when AST::MatchStmt
    arm_lines = Array(statement.arms).map do |arm|
      generic_statement_list_end_line(Array(arm.body), arm.line || statement.line)
    end
    ([statement.line] + arm_lines).compact.max
  when AST::UnsafeStmt, AST::WhileStmt, AST::ForStmt, AST::DeferStmt
    [statement.line, generic_statement_list_end_line(Array(statement.body), statement.line)].compact.max
  else
    statement.line || 0
  end
end

#generic_statement_list_end_line(statements, fallback_line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 856

def generic_statement_list_end_line(statements, fallback_line)
  Array(statements).reduce(fallback_line || 0) do |max_line, statement|
    [max_line, generic_statement_end_line(statement)].compact.max
  end
end

#generic_type_parameter_header_token?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1246

def generic_type_parameter_header_token?(type)
  [:function, :struct, :union, :enum, :flags, :variant, :type, :extending].include?(type)
end

#generic_type_parameter_names_for_declaration(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1297

def generic_type_parameter_names_for_declaration(decl)
  return [] unless decl.respond_to?(:type_params)

  Array(decl.type_params).filter_map { |type_param| type_param.respond_to?(:name) ? type_param.name : nil }
end

#generic_type_parameter_names_for_extending_block(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1303

def generic_type_parameter_names_for_extending_block(decl)
  return [] unless decl.respond_to?(:type_name)

  type_ref = decl.type_name
  return [] unless type_ref.is_a?(AST::TypeRef)

  Array(type_ref.arguments).filter_map do |argument|
    simple_type_parameter_name_from_type_argument(argument)
  end
end

#handle_semantic_tokens_delta(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 60

def handle_semantic_tokens_delta(params)
  uri = params.dig('textDocument', 'uri')
  previous_result_id = params['previousResultId']
  return handle_semantic_tokens_full(params) unless uri && previous_result_id

  cached = @semantic_tokens_delta_cache[uri]
  unless cached && cached[:result_id] == previous_result_id
    return handle_semantic_tokens_full(params)
  end

  content = @workspace.get_content(uri)
  cache_key = content.hash
  if cached[:content_hash] == cache_key
    return { resultId: cached[:result_id], edits: [] }
  end

  tokens = @workspace.get_tokens(uri) || []
  facts = @workspace.get_facts(uri, allow_last_good_fallback: semantic_tokens_allow_last_good_fallback?(uri))
  new_entries = build_semantic_token_entries(tokens, facts)

  new_result_id = next_semantic_token_result_id(uri)
  @semantic_tokens_delta_cache[uri] = {
    result_id: new_result_id,
    content_hash: cache_key,
    entries: new_entries,
  }

  edits = compute_semantic_tokens_edits(cached[:entries], new_entries)
  { resultId: new_result_id, edits: edits }
rescue StandardError => e
  warn "Error in semanticTokens/full/delta handler: #{e.message}"
  handle_semantic_tokens_full(params)
end

#handle_semantic_tokens_full(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 7

def handle_semantic_tokens_full(params)
  uri = params.dig('textDocument', 'uri')
  return { data: [] } unless uri

  total_start = monotonic_time

  content = @workspace.get_content(uri)
  cache_key = content.hash
  cached = @semantic_tokens_cache[uri]
  if cached && cached[:content_hash] == cache_key
    elapsed = elapsed_ms(total_start)
    short_uri = shorten_uri(uri) || uri
    log_perf_breakdown('textDocument/semanticTokens/full', elapsed,
                      "uri=#{short_uri} bytes=#{content.bytesize} lines=#{content.count("\n") + 1} cache=hit data_len=#{cached[:data].length}")
    return { data: cached[:data] }
  end

  tokens_start = monotonic_time
  tokens = @workspace.get_tokens(uri) || []
  tokens_ms = elapsed_ms(tokens_start)

  facts_start = monotonic_time
  facts = @workspace.get_facts(uri, allow_last_good_fallback: semantic_tokens_allow_last_good_fallback?(uri))
  facts_ms = elapsed_ms(facts_start)

  build_start = monotonic_time
  semantic_entries = build_semantic_token_entries(tokens, facts)
  build_ms = elapsed_ms(build_start)

  encode_start = monotonic_time
  data = encode_semantic_tokens(semantic_entries)
  encode_ms = elapsed_ms(encode_start)

  @semantic_tokens_cache[uri] = { content_hash: cache_key, data: data }

  result_id = next_semantic_token_result_id(uri)
  @semantic_tokens_delta_cache[uri] = {
    result_id: result_id,
    content_hash: cache_key,
    entries: semantic_entries,
  }

  elapsed = elapsed_ms(total_start)
  short_uri = shorten_uri(uri) || uri
  log_perf_breakdown('textDocument/semanticTokens/full', elapsed,
                    "uri=#{short_uri} bytes=#{content.bytesize} lines=#{content.count("\n") + 1} cache=miss tokens=#{tokens.length} entries=#{semantic_entries.length} data_len=#{data.length} facts=on stages_ms=tokens:#{tokens_ms},facts:#{facts_ms},build:#{build_ms},encode:#{encode_ms}")

  { data: data }
rescue StandardError => e
  warn "Error in semanticTokens/full handler: #{e.message}"
  { data: [] }
end

#handle_semantic_tokens_range(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 94

def handle_semantic_tokens_range(params)
  uri = params.dig("textDocument", "uri")
  range = params["range"]
  return { data: [] } unless uri && range

  content = @workspace.get_content(uri)
  return { data: [] } unless content

  tokens = @workspace.get_tokens(uri) || []
  return { data: [] } if tokens.empty?

  start_line = range.dig("start", "line") + 1
  end_line = range.dig("end", "line") + 1

  range_tokens = tokens.select do |t|
    t.line >= start_line && t.line <= end_line &&
      ![:newline, :indent, :dedent, :eof].include?(t.type)
  end

  facts = @workspace.get_facts(uri, allow_last_good_fallback: semantic_tokens_allow_last_good_fallback?(uri))
  semantic_entries = build_semantic_token_entries(range_tokens, facts)

  entries_in_range = semantic_entries.select do |entry|
    entry[:line] >= start_line && entry[:line] <= end_line
  end

  data = encode_semantic_tokens(entries_in_range)
  { data: data }
rescue StandardError => e
  warn "Error in semanticTokens/range handler: #{e.message}"
  { data: [] }
end

#identifier_in_type_argument_position?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1122

def identifier_in_type_argument_position?(tokens, index)
  lbracket_index = previous_non_trivia_token_index(tokens, index)
  return false unless lbracket_index

  if tokens[lbracket_index].type == :comma
    depth = 0
    i = lbracket_index - 1
    lbracket_index = nil
    while i >= 0
      tok = tokens[i]
      if tok.type == :rbracket
        depth += 1
      elsif tok.type == :lbracket
        if depth.zero?
          lbracket_index = i
          break
        end

        depth -= 1
      end
      i -= 1
    end
  end

  return false unless lbracket_index && tokens[lbracket_index].type == :lbracket

  rbracket_index = matching_closer_index(tokens, lbracket_index, :lbracket, :rbracket)
  return false unless rbracket_index

  next_index = next_non_trivia_token_index(tokens, index + 1)
  return false unless next_index

  # Type argument entries should stay inside the current [] pair.
  next_index <= rbracket_index
end

#identifier_in_type_parameter_reference_position?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1171

def identifier_in_type_parameter_reference_position?(tokens, index)
  return true if identifier_in_type_argument_position?(tokens, index)

  prev_tok = previous_non_trivia_token(tokens, index)
  [:colon, :arrow].include?(prev_tok&.type)
end

#identifier_in_type_reference_position?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1178

def identifier_in_type_reference_position?(tokens, index)
  return true if identifier_in_type_argument_position?(tokens, index)

  prev_tok = previous_non_trivia_token(tokens, index)
  return true if [:colon, :arrow, :as].include?(prev_tok&.type)

  line_tokens = non_trivia_tokens_on_line(tokens, tokens[index].line)
  return true if prev_tok&.type == :equal && line_tokens.first&.type == :type

  next_index = next_non_trivia_token_index(tokens, index + 1)
  return false unless next_index && tokens[next_index].type == :less

  minus_index = next_non_trivia_token_index(tokens, next_index + 1)
  return false unless minus_index && tokens[minus_index].type == :minus

  tokens[next_index].line == tokens[index].line &&
    tokens[next_index].column == (tokens[index].column + tokens[index].lexeme.length) &&
    tokens[minus_index].line == tokens[next_index].line &&
    tokens[minus_index].column == (tokens[next_index].column + tokens[next_index].lexeme.length)
end

#import_path_info_at(tokens, index, allow_keywords: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1347

def import_path_info_at(tokens, index, allow_keywords: false)
  tok = tokens[index]
  return nil unless tok
  return nil unless tok.type == :identifier || (allow_keywords && Token::KEYWORDS.value?(tok.type))

  line_tokens = non_trivia_tokens_on_line(tokens, tok.line)
  return nil if line_tokens.empty? || line_tokens.first.type != :import

  as_index = line_tokens.index { |line_tok| line_tok.type == :as }
  module_tokens = line_tokens[1...(as_index || line_tokens.length)] || []
  alias_token = as_index ? line_tokens[as_index + 1] : nil

  module_identifiers = module_tokens.select do |line_tok|
    line_tok.type == :identifier || (allow_keywords && Token::KEYWORDS.value?(line_tok.type))
  end
  return nil if module_identifiers.empty?

  module_name = module_identifiers.map(&:lexeme).join('.')
  return { module_name: module_name, role: :module_path } if module_identifiers.include?(tok)
  return { module_name: module_name, role: :alias } if alias_token == tok

  nil
end

#imported_module_binding_for_member(tokens, index, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1059

def imported_module_binding_for_member(tokens, index, facts)
  dot_index = previous_non_trivia_token_index(tokens, index)
  return nil unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return nil unless receiver_index

  receiver = tokens[receiver_index]
  return nil unless receiver.type == :identifier

  facts.imports[receiver.lexeme]
end

#imported_module_function_value_member_access_site?(facts, tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1043

def imported_module_function_value_member_access_site?(facts, tokens, index)
  dot_index = previous_non_trivia_token_index(tokens, index)
  return false unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return false unless receiver_index

  receiver = tokens[receiver_index]
  return false unless receiver.type == :identifier

  facts.callable_value_member_access_sites.fetch(
    [receiver.lexeme, receiver.line, receiver.column, tokens[index].lexeme],
    false,
  )
end

#known_type_name?(facts, name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 984

def known_type_name?(facts, name)
  return false unless facts
  return true if facts.types.key?(name)
  facts.types.each_value do |type|
    return true if type.respond_to?(:nested_types) && type.nested_types.key?(name)
  end
  false
end

#lexically_declared_free_function_name?(tokens, name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 675

def lexically_declared_free_function_name?(tokens, name)
  lexically_declared_free_function_names(tokens).include?(name)
end

#lexically_declared_free_function_names(tokens) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 679

def lexically_declared_free_function_names(tokens)
  cache = @lexically_declared_free_function_name_cache ||= {}
  cached = cache[tokens.object_id]
  return cached if cached

  cache[tokens.object_id] = tokens.each_with_index.each_with_object(Set.new) do |(token, index), names|
    next unless token.type == :identifier

    prev_index = previous_non_trivia_token_index(tokens, index)
    next unless prev_index

    prev_tok = tokens[prev_index]
    next unless [:function, :fn, :proc].include?(prev_tok.type)
    next unless first_non_trivia_token_on_line?(tokens, prev_index)

    names << token.lexeme
  end
end

#local_semantic_value_binding(facts, token, allow_same_line_future: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 893

def local_semantic_value_binding(facts, token, allow_same_line_future: false)
  char = token.column - 1
  [token.line - 1, token.line].uniq.each do |line|
    frame = enclosing_completion_frame(facts, line)
    next unless frame

    snapshot = latest_completion_snapshot(frame, line, char)
    binding = snapshot&.bindings&.dig(token.lexeme)
    return binding if binding

    next unless allow_same_line_future

    future_snapshot = same_line_future_completion_snapshot(frame, line, char)
    binding = future_snapshot&.bindings&.dig(token.lexeme)
    return binding if binding
  end

  nil
end

#mark_attribute_name_override(overrides, token_indices_by_position, tokens, parts, line:, column:, declaration: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1545

def mark_attribute_name_override(overrides, token_indices_by_position, tokens, parts, line:, column:, declaration: false)
  current_index = token_indices_by_position[[line, column]]
  return unless current_index

  parts.each_with_index do |part, part_index|
    token = tokens[current_index]
    return unless token&.lexeme == part

    if part_index == parts.length - 1
      modifiers = []
      modifiers << 'declaration' if declaration
      overrides[[token.line, token.column]] = [:decorator, modifiers]
      return
    end

    overrides[[token.line, token.column]] = [:namespace, []]
    dot_index = next_non_trivia_token_index(tokens, current_index + 1)
    return unless dot_index && tokens[dot_index].type == :dot

    current_index = next_non_trivia_token_index(tokens, dot_index + 1)
    return unless current_index
  end
end

#mark_attribute_reflection_name_overrides(overrides, token_indices_by_position, tokens, call_expression) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1513

def mark_attribute_reflection_name_overrides(overrides, token_indices_by_position, tokens, call_expression)
  callee = call_expression.callee
  return unless callee.is_a?(AST::Identifier)
  return unless %w[has_attribute attribute_of].include?(callee.name)
  return unless call_expression.arguments.length >= 2

  attribute_name_expression = call_expression.arguments[1].value

  case attribute_name_expression
  when AST::Identifier
    mark_attribute_name_override(
      overrides,
      token_indices_by_position,
      tokens,
      [attribute_name_expression.name],
      line: attribute_name_expression.line,
      column: attribute_name_expression.column,
    )
  when AST::MemberAccess
    return unless attribute_name_expression.receiver.is_a?(AST::Identifier)

    mark_attribute_name_override(
      overrides,
      token_indices_by_position,
      tokens,
      [attribute_name_expression.receiver.name, attribute_name_expression.member],
      line: attribute_name_expression.receiver.line,
      column: attribute_name_expression.receiver.column,
    )
  end
end

#match_arm_binding_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 536

def match_arm_binding_token?(tokens, index)
  prev_tok = previous_non_trivia_token(tokens, index)
  next_tok = next_non_trivia_token(tokens, index + 1)
  prev_tok&.type == :as && next_tok&.type == :colon
end

#matching_closer_index(tokens, opener_index, opener_type, closer_type) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1331

def matching_closer_index(tokens, opener_index, opener_type, closer_type)
  depth = 0
  i = opener_index
  while i < tokens.length
    tok = tokens[i]
    if tok.type == opener_type
      depth += 1
    elsif tok.type == closer_type
      depth -= 1
      return i if depth.zero?
    end
    i += 1
  end
  nil
end

#matching_opener_index(tokens, closer_index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1429

def matching_opener_index(tokens, closer_index)
  closer = tokens[closer_index]
  return nil unless closer

  opener_type, closer_type = case closer.type
    when :rbracket then [:lbracket, :rbracket]
    when :rparen   then [:lparen,   :rparen]
    else return nil
  end

  depth = 0
  i = closer_index
  while i >= 0
    t = tokens[i]
    if t.type == closer_type
      depth += 1
    elsif t.type == opener_type
      depth -= 1
      return i if depth.zero?
    end
    i -= 1
  end
  nil
end

#module_declaration_info_at(tokens, index, allow_keywords: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1573

def module_declaration_info_at(tokens, index, allow_keywords: false)
  tok = tokens[index]
  return nil unless tok&.type == :identifier || (allow_keywords && Token::KEYWORDS.value?(tok.type))

  line_tokens = non_trivia_tokens_on_line(tokens, tok.line)
  return nil if line_tokens.empty? || line_tokens.first.type != :module

  path_tokens = line_tokens[1..].to_a.select do |line_tok|
    line_tok.type == :identifier || (allow_keywords && Token::KEYWORDS.value?(line_tok.type))
  end
  return nil unless path_tokens.any? { |line_tok| line_tok.equal?(tok) }

  {
    module_name: path_tokens.map(&:lexeme).join('.'),
  }
end

#module_declaration_path_token?(tokens, index, allow_keywords: false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1569

def module_declaration_path_token?(tokens, index, allow_keywords: false)
  !module_declaration_info_at(tokens, index, allow_keywords:).nil?
end

#named_argument_label_in_type_constructor?(tokens, index, facts) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 498

def named_argument_label_in_type_constructor?(tokens, index, facts)
  return false unless facts

  opener_index = parameter_list_opener_index(tokens, index)
  return false unless opener_index

  callee_index = previous_non_trivia_token_index(tokens, opener_index)
  return false unless callee_index

  if tokens[callee_index].type == :rbracket
    lbracket_index = matching_opener_index(tokens, callee_index)
    return false unless lbracket_index
    callee_index = previous_non_trivia_token_index(tokens, lbracket_index)
  end

  return false unless callee_index && tokens[callee_index].type == :identifier

  callee_name = tokens[callee_index].lexeme
  return true if facts.types.key?(callee_name) || facts.interfaces.key?(callee_name)

  dot_index = previous_non_trivia_token_index(tokens, callee_index)
  return false unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return false unless receiver_index

  if tokens[receiver_index].type == :rbracket
    lbracket_index = matching_opener_index(tokens, receiver_index)
    return false unless lbracket_index
    receiver_index = previous_non_trivia_token_index(tokens, lbracket_index)
  end

  return false unless receiver_index && tokens[receiver_index].type == :identifier

  receiver_name = tokens[receiver_index].lexeme
  facts.types.key?(receiver_name) || facts.interfaces.key?(receiver_name)
end

#named_argument_label_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 492

def named_argument_label_token?(tokens, index)
  prev_tok = previous_non_trivia_token(tokens, index)
  next_tok = next_non_trivia_token(tokens, index + 1)
  next_tok&.type == :equal && prev_tok && [:lparen, :comma].include?(prev_tok.type)
end

#namespace_keyword_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 884

def namespace_keyword_token?(tokens, index)
  tok = tokens[index]
  return false unless tok && Token::KEYWORDS.value?(tok.type)

  import_path_info_at(tokens, index, allow_keywords: true) ||
    module_declaration_path_token?(tokens, index, allow_keywords: true)

end

#nested_declaration_scope_end_line(decls, index, fallback_end_line:) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1326

def nested_declaration_scope_end_line(decls, index, fallback_end_line:)
  next_decl = decls[(index + 1)..]&.find { |candidate| candidate.line }
  next_decl ? next_decl.line - 1 : fallback_end_line
end

#next_non_trivia_token_index(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1623

def next_non_trivia_token_index(tokens, index)
  i = index
  while i < tokens.length
    tok = tokens[i]
    return i unless [:newline, :indent, :dedent].include?(tok.type)
    i += 1
  end
  nil
end

#next_semantic_token_result_id(uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1657

def next_semantic_token_result_id(uri)
  @semantic_token_result_counter ||= 0
  @semantic_token_result_counter += 1
  "#{uri}:#{@semantic_token_result_counter}"
end

#non_trivia_tokens_on_line(tokens, line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1454

def non_trivia_tokens_on_line(tokens, line)
  return @tokens_by_line_cache[line] if @tokens_by_line_cache

  tokens.select do |tok|
    tok.line == line && ![:newline, :indent, :dedent, :eof].include?(tok.type)
  end
end

#parameter_declaration_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 621

def parameter_declaration_token?(tokens, index)
  prev_tok = previous_non_trivia_token(tokens, index)
  next_tok = next_non_trivia_token(tokens, index + 1)
  next_tok&.type == :colon && prev_tok && (
    [:lparen, :comma].include?(prev_tok.type) ||
    FOREIGN_PARAM_MODE_TOKENS.include?(prev_tok.type)
  )
end

#parameter_list_opener_index(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 657

def parameter_list_opener_index(tokens, index)
  depth = 0
  i = index - 1
  while i >= 0
    tok = tokens[i]
    if tok.type == :rparen
      depth += 1
    elsif tok.type == :lparen
      return i if depth.zero?

      depth -= 1
    end
    i -= 1
  end

  nil
end

#previous_non_trivia_token(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1590

def previous_non_trivia_token(tokens, index)
  prev_index = previous_non_trivia_token_index(tokens, index)
  return nil unless prev_index

  tokens[prev_index]
end

#previous_non_trivia_token_index(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1613

def previous_non_trivia_token_index(tokens, index)
  i = index - 1
  while i >= 0
    tok = tokens[i]
    return i unless [:newline, :indent, :dedent].include?(tok.type)
    i -= 1
  end
  nil
end

#resolve_receiver_value_type(facts, token) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 969

def resolve_receiver_value_type(facts, token)
  char = token.column

  [token.line - 1, token.line].uniq.each do |line|
    receiver_type = resolve_dot_receiver_value_type(facts, token.lexeme, line, char)
    return receiver_type if receiver_type
  end

  nil
end

#resolve_struct_type_name(facts, name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1010

def resolve_struct_type_name(facts, name)
  type = facts.types[name]
  return type if type.is_a?(Types::Struct)
  facts.types.each_value do |t|
    next unless t.respond_to?(:nested_types)
    found = t.nested_types[name]
    return found if found.is_a?(Types::Struct)
  end
  nil
end

#resolved_call_callee_semantic(name, token, parameter_declaration, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 928

def resolved_call_callee_semantic(name, token, parameter_declaration, facts)
  if (binding = local_semantic_value_binding(facts, token, allow_same_line_future: parameter_declaration))
    return semantic_value_binding_entry(binding, declaration: binding.kind == :param && parameter_declaration)
  end

  if (binding = facts.values[name])
    return semantic_value_binding_entry(binding)
  end

  modifiers = []
  modifiers << 'defaultLibrary' if BUILTIN_FUNCTION_NAMES.include?(name)
  return [:function, modifiers] if BUILTIN_FUNCTION_NAMES.include?(name)
  return [:function, modifiers] if facts.functions.key?(name)
  return [:type, []] if constructible_semantic_type?(facts.types[name])

  nil
end

#semantic_modifiers_bitset(modifiers) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1713

def semantic_modifiers_bitset(modifiers)
  bits = 0
  Array(modifiers).each do |modifier|
    idx = SEMANTIC_TOKEN_MODIFIERS.index(modifier.to_s)
    next unless idx

    bits |= (1 << idx)
  end
  bits
end

#semantic_token_entry_equal?(a, b) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1705

def semantic_token_entry_equal?(a, b)
  a[:line] == b[:line] &&
    a[:start_char] == b[:start_char] &&
    a[:length] == b[:length] &&
    a[:type] == b[:type] &&
    a[:modifiers] == b[:modifiers]
end

#semantic_value_binding_entry(binding, declaration: false) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 913

def semantic_value_binding_entry(binding, declaration: false)
  case binding.kind
  when :param
    modifiers = []
    modifiers << 'declaration' if declaration
    [:parameter, modifiers]
  when :const, :let
    [:variable, ['readonly']]
  else
    modifiers = []
    modifiers << 'declaration' if declaration
    [:variable, modifiers]
  end
end

#simple_type_parameter_name_from_type_argument(argument) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1314

def simple_type_parameter_name_from_type_argument(argument)
  value = argument.respond_to?(:value) ? argument.value : nil
  return nil unless value.is_a?(AST::TypeRef)
  return nil unless value.arguments.empty? && !value.nullable && value.name.parts.length == 1

  value.name.parts.first
end

#specialized_call_with_type_args?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1111

def specialized_call_with_type_args?(tokens, index)
  next_index = next_non_trivia_token_index(tokens, index + 1)
  return false unless next_index && tokens[next_index].type == :lbracket

  rbracket_index = matching_closer_index(tokens, next_index, :lbracket, :rbracket)
  return false unless rbracket_index

  after_bracket_index = next_non_trivia_token_index(tokens, rbracket_index + 1)
  after_bracket_index && tokens[after_bracket_index].type == :lparen
end

#static_type_member_access?(tokens, index, facts) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1072

def static_type_member_access?(tokens, index, facts)
  receiver_info = dot_type_receiver_info(tokens, index, facts)
  return false unless receiver_info

  !static_method_binding_for_receiver(facts, receiver_info[:type], tokens[index].lexeme).nil?
end

#struct_event_declaration_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 580

def struct_event_declaration_token?(tokens, index)
  tok = tokens[index]
  return false unless tok&.type == :identifier

  prev_tok = previous_non_trivia_token(tokens, index)
  return false unless prev_tok&.type == :event

  line_tokens = non_trivia_tokens_on_line(tokens, tok.line)
  line_start = line_tokens.first
  return false unless line_start && line_start.column > 1

  i = index - 1
  while i >= 0
    current = tokens[i]
    i -= 1
    next if [:newline, :indent, :dedent, :eof].include?(current.type)
    next if current.line == tok.line
    next if current.column >= line_start.column

    header_line_toks = non_trivia_tokens_on_line(tokens, current.line)
    return header_line_toks.first&.type == :struct
  end

  false
end

#token_semantic_entries(token, semantic_type, modifiers) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 297

def token_semantic_entries(token, semantic_type, modifiers)
  token.lexeme.split("\n", -1).each_with_index.filter_map do |segment, index|
    next if segment.empty?

    {
      line: token.line - 1 + index,
      start_char: index.zero? ? (token.column - 1) : 0,
      length: segment.length,
      type: semantic_type,
      modifiers: modifiers
    }
  end
end

#type_name_member_access?(tokens, index, facts = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1391

def type_name_member_access?(tokens, index, facts = nil)
  dot_index = previous_non_trivia_token_index(tokens, index)
  return false unless dot_index && tokens[dot_index].type == :dot

  receiver_index = previous_non_trivia_token_index(tokens, dot_index)
  return false unless receiver_index

  type_name_receiver_token?(tokens, receiver_index, facts)
end

#type_name_receiver_token?(tokens, index, facts = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1401

def type_name_receiver_token?(tokens, index, facts = nil)
  receiver = tokens[index]

  if receiver.type == :identifier
    return true if receiver.lexeme.match?(/\A[A-Z]/)
    return true if facts && facts.types.key?(receiver.lexeme)

    if facts
      module_binding = imported_module_binding_for_member(tokens, index, facts)
      return true if module_binding && module_binding.types.key?(receiver.lexeme)
    end

    return false
  end

  if receiver.type == :rbracket
    lbracket_i = matching_opener_index(tokens, index)
    return false unless lbracket_i

    base_index = previous_non_trivia_token_index(tokens, lbracket_i)
    return false unless base_index

    return type_name_receiver_token?(tokens, base_index, facts)
  end

  false
end

#type_parameter_declaration_info_on_line(tokens, line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1199

def type_parameter_declaration_info_on_line(tokens, line)
  line_tokens = non_trivia_tokens_on_line(tokens, line)
  return nil if line_tokens.empty?

  header_index = line_tokens.index { |line_tok| generic_type_parameter_header_token?(line_tok.type) }
  return nil unless header_index

  name_index = ((header_index + 1)...line_tokens.length).find { |i| line_tokens[i].type == :identifier }
  return nil unless name_index

  lbracket_index = name_index + 1
  return nil unless line_tokens[lbracket_index]&.type == :lbracket

  depth = 0
  type_param_tokens = []
  expect_name = false
  i = lbracket_index
  while i < line_tokens.length
    tok = line_tokens[i]
    case tok.type
    when :lbracket
      depth += 1
      expect_name = true if depth == 1
    when :rbracket
      depth -= 1
      return {
        names: type_param_tokens.map(&:lexeme),
        tokens: type_param_tokens,
      } if depth.zero?
    when :comma
      expect_name = true if depth == 1
    when :at
      expect_name = false if depth == 1
    when :implements
      expect_name = false if depth == 1
    else
      if depth == 1 && expect_name && tok.type == :identifier
        type_param_tokens << tok
        expect_name = false
      end
    end
    i += 1
  end

  nil
end

#type_parameter_declaration_token?(facts, tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1158

def type_parameter_declaration_token?(facts, tokens, index)
  info = type_parameter_declaration_info_on_line(tokens, tokens[index].line)
  info && info[:tokens].any? { |token| token.equal?(tokens[index]) }
end

#type_parameter_names_in_scope(facts, line) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1250

def type_parameter_names_in_scope(facts, line)
  scopes = @type_parameter_scope_cache ||= {}
  cached = scopes[facts.object_id]
  unless cached
    decls = Array(facts.ast&.declarations)
    cached = decls.each_with_index.flat_map do |decl, index|
      type_parameter_scopes_for_declaration(
        decl,
        end_line: declaration_scope_end_line(decls, index),
      )
    end
    scopes[facts.object_id] = cached
  end

  cached.reverse_each do |scope|
    return scope[:names] if line >= scope[:start_line] && line <= scope[:end_line]
  end

  []
end

#type_parameter_reference_token?(facts, tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1163

def type_parameter_reference_token?(facts, tokens, index)
  tok = tokens[index]
  return false unless type_parameter_names_in_scope(facts, tok.line).include?(tok.lexeme)
  return false if type_parameter_declaration_token?(facts, tokens, index)

  identifier_in_type_parameter_reference_position?(tokens, index)
end

#type_parameter_scopes_for_declaration(decl, end_line: Float::INFINITY) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1271

def type_parameter_scopes_for_declaration(decl, end_line: Float::INFINITY)
  if decl.is_a?(AST::ExtendingBlock)
    receiver_names = generic_type_parameter_names_for_extending_block(decl)
    methods = Array(decl.methods)
    return methods.each_with_index.filter_map do |method, index|
      names = receiver_names + generic_type_parameter_names_for_declaration(method)
      next if names.empty? || method.line.nil?

      {
        start_line: method.line,
        end_line: nested_declaration_scope_end_line(methods, index, fallback_end_line: end_line),
        names: names.uniq,
      }
    end
  end

  names = generic_type_parameter_names_for_declaration(decl)
  return [] if names.empty? || decl.line.nil?

  [{
    start_line: decl.line,
    end_line: end_line,
    names: names,
  }]
end

#variant_enum_member_declaration?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1371

def variant_enum_member_declaration?(tokens, index)
  tok = tokens[index]
  line_tokens = non_trivia_tokens_on_line(tokens, tok.line)
  return false unless line_tokens.first.equal?(tok) && tok.column > 1

  i = index - 1
  while i >= 0
    t = tokens[i]
    i -= 1
    next if [:newline, :indent, :dedent, :eof].include?(t.type)
    next if t.line == tok.line
    next if t.column >= tok.column

    header_line_toks = non_trivia_tokens_on_line(tokens, t.line)
    header_kind = header_line_toks.find { |header_tok| [:variant, :enum, :flags].include?(header_tok.type) }
    return !header_kind.nil?
  end
  false
end

#variant_payload_field_declaration_token?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 606

def variant_payload_field_declaration_token?(tokens, index)
  return false unless parameter_declaration_token?(tokens, index)

  opener_index = parameter_list_opener_index(tokens, index)
  return false unless opener_index

  head_index = previous_non_trivia_token_index(tokens, opener_index)
  return false unless head_index

  variant_enum_member_declaration?(tokens, head_index)
end

#walk_ast_nodes(node, &block) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/semantic_tokens.rb', line 1499

def walk_ast_nodes(node, &block)
  case node
  when Array
    node.each { |entry| walk_ast_nodes(entry, &block) }
  when String, Symbol, Numeric, TrueClass, FalseClass, NilClass
    nil
  else
    return unless node.class.name&.start_with?("MilkTea::AST::")

    yield node
    node.to_h.each_value { |value| walk_ast_nodes(value, &block) }
  end
end