Module: MilkTea::LSP::Server::ServerUtilities

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

Constant Summary collapse

MESSAGE_TYPES = 
{
  error:   1,
  warning: 2,
  info:    3,
  log:     4,
}.freeze

Instance Method Summary collapse

Instance Method Details

#clear_cancelled_request(id) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 236

def clear_cancelled_request(id)
  return if id.nil?

  @cancelled_requests_mutex.synchronize do
    @cancelled_request_ids.delete(id)
  end
end

#collect_call_argument_starts(tokens, lparen_index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 388

def collect_call_argument_starts(tokens, lparen_index)
  starts = []
  depth = 1
  j = lparen_index + 1

  first = next_non_trivia_token(tokens, j)
  starts << first if first && first.type != :rparen

  while j < tokens.length
    tok = tokens[j]
    case tok.type
    when :lparen
      depth += 1
    when :rparen
      depth -= 1
      return [starts, j] if depth.zero?
    when :comma
      if depth == 1
        next_tok = next_non_trivia_token(tokens, j + 1)
        starts << next_tok if next_tok && next_tok.type != :rparen
      end
    end
    j += 1
  end

  [starts, nil]
end

#current_word_prefix(uri, lsp_line, lsp_char) ⇒ Object 



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

def current_word_prefix(uri, lsp_line, lsp_char)
  lines = @workspace.document_lines(uri)
  line  = lines[lsp_line] || ''
  # Walk backwards from cursor to find start of current word
  char_idx = [lsp_char - 1, line.length - 1].min
  return '' if char_idx < 0

  start = char_idx
  start -= 1 while start >= 0 && line[start] =~ /[A-Za-z0-9_]/
  line[(start + 1)..char_idx] || ''
end

#decode_client_char(uri, lsp_line, client_char) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 336

def decode_client_char(uri, lsp_line, client_char)
  return client_char if @position_encoding == 'utf-16'

  content = @workspace.get_content(uri)
  return client_char unless content

  lines = content.split("\n", -1)
  line_text = lines[lsp_line]
  return client_char unless line_text

  if @position_encoding == 'utf-8'
    utf8_to_utf16_char(line_text, client_char)
  elsif @position_encoding == 'utf-32'
    utf32_to_utf16_char(line_text, client_char)
  else
    client_char
  end
end

#diagnostics_fingerprint(content, diagnostics) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 375

def diagnostics_fingerprint(content, diagnostics)
  [content, diagnostics].hash.to_s(16)
end

#elapsed_ms(start_time) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 23

def elapsed_ms(start_time)
  ((monotonic_time - start_time) * 1000).round(1)
end

#encode_char_for_client(lsp_line, internal_char) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 330

def encode_char_for_client(lsp_line, internal_char)
  return internal_char if @position_encoding == 'utf-16'

  internal_char
end

#format_document_symbol(sym) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 261

def format_document_symbol(sym)
  line = sym[:line].to_i
  col  = sym[:column].to_i

  {
    name:           sym[:name],
    kind:           symbol_kind(sym[:kind]),
    range:          {
      start: { line: line - 1, character: col - 1 },
      end:   { line: line - 1, character: col - 1 + sym[:name].length }
    },
    selectionRange: {
      start: { line: line - 1, character: col - 1 },
      end:   { line: line - 1, character: col - 1 + sym[:name].length }
    }
  }
end

#format_symbol(sym, uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 244

def format_symbol(sym, uri)
  line = sym[:line].to_i
  col  = sym[:column].to_i

  {
    name:     sym[:name],
    kind:     symbol_kind(sym[:kind]),
    location: {
      uri:   uri,
      range: {
        start: { line: line - 1, character: col - 1 },
        end:   { line: line - 1, character: col - 1 + sym[:name].length }
      }
    }
  }
end

#handle_did_change_watched_files(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 178

def handle_did_change_watched_files(params)
  changes = params['changes'] || []
  @workspace.apply_module_index_events(changes)
  affected_uris = Set.new
  changes.each do |change|
    uri = change['uri']
    type = change['type']
    next unless uri

    affected_uris.merge(@workspace.apply_watched_file_change(uri, type))
  end

  invalidate_document_caches_for(affected_uris)
  affected_uris.each do |affected_uri|
    schedule_diagnostics(affected_uri, force: true, lint_tier: :full) unless @workspace.background_document?(affected_uri)
  end
  refresh_client_semantic_tokens if affected_uris.any?
  nil
end

#hget(hash, key) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 113

def hget(hash, key)
  return nil unless hash.is_a?(Hash)

  hash[key] || hash[key.to_sym]
end

#invalidate_document_caches(uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 198

def invalidate_document_caches(uri)
  @semantic_tokens_cache.delete(uri)
  @semantic_tokens_delta_cache.delete(uri)
  @fixall_cache.delete(uri)
  @document_symbol_cache.delete(uri)
  @completion_docs_cache.clear
  @completion_resolve_cache.clear
  path = uri_to_path(uri)
  if path
    prefix = "#{path}:"
    @definition_file_token_cache.delete_if { |key, _| key.start_with?(prefix) }
    @definition_file_ast_cache.delete_if { |key, _| key.start_with?(prefix) }
  end
end

#invalidate_document_caches_for(uris) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 213

def invalidate_document_caches_for(uris)
  uris.each { |uri| invalidate_document_caches(uri) }
end

#library_uri?(uri) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 148

def library_uri?(uri)
  return false unless @root_uri

  file_path = uri_to_path(uri)
  root_path = uri_to_path(@root_uri)
  return false unless file_path && root_path

  !file_path.start_with?(root_path)
rescue StandardError
  false
end

#log_message(type, message) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 473

def log_message(type, message)
  @protocol.write_notification("window/logMessage", {
    type: MESSAGE_TYPES[type] || type,
    message: message,
  })
end

#log_perf_breakdown(method_name, elapsed_ms_value, detail) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 27

def log_perf_breakdown(method_name, elapsed_ms_value, detail)
  return unless perf_breakdown_logging?(elapsed_ms_value)

  id_detail = @current_request_id ? " id=#{@current_request_id}" : ''
  warn "[LSP perf] breakdown #{method_name} #{elapsed_ms_value}ms#{id_detail} #{detail}"
end

#log_request_stage_breakdown(method_name, total_start, uri: nil, stages: nil, summary: nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 47

def log_request_stage_breakdown(method_name, total_start, uri: nil, stages: nil, summary: nil)
  return unless total_start

  detail = []
  detail << "uri=#{shorten_uri(uri) || uri}" if uri
  detail << summary if summary && !summary.empty?
  unless stages.nil? || stages.empty?
    detail << "stages_ms=#{stages.map { |name, ms| "#{name}:#{ms}" }.join(',')}"
  end

  log_perf_breakdown(method_name, elapsed_ms(total_start), detail.join(' '))
end

#measure_perf_stage(stages, name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 38

def measure_perf_stage(stages, name)
  return yield unless stages

  start_time = monotonic_time
  result = yield
  stages << [name, elapsed_ms(start_time)]
  result
end

#monotonic_time ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 19

def monotonic_time
  Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

#new_perf_stages ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 34

def new_perf_stages
  perf_logging? ? [] : nil
end

#next_diagnostic_result_id(uri, fingerprint) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 379

def next_diagnostic_result_id(uri, fingerprint)
  "#{uri}:#{fingerprint}"
end

#next_non_trivia_token(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 450

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

#path_to_uri(path) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 383

def path_to_uri(path)
  escaped_path = path.split('/').map { |seg| CGI.escape(seg).gsub('+', '%20') }.join('/')
  "file://#{escaped_path}"
end

#perf_breakdown_logging?(elapsed_ms) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 15

def perf_breakdown_logging?(elapsed_ms)
  perf_logging? && (perf_verbose? || elapsed_ms > Workspace::PERF_LOG_THRESHOLD_MS)
end

#perf_log_context(method_name, params, verbose: false) ⇒ Object 



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

def perf_log_context(method_name, params, verbose: false)
  return "" unless params.is_a?(Hash)

  summary = summarize_lsp_params(method_name, params)
  return summary.empty? ? "" : " #{summary}" if verbose

  text_document = hget(params, 'textDocument')
  uri = text_document.is_a?(Hash) ? hget(text_document, 'uri') : nil
  bits = []
  bits << "uri=#{shorten_uri(uri) || uri}" if uri

  if method_name == 'textDocument/didChange'
    changes = hget(params, 'contentChanges')
    bits << "changes=#{changes.length}" if changes.respond_to?(:length)
  end

  bits.empty? ? "" : " #{bits.join(' ')}"
rescue StandardError
  ""
end

#perf_logging? ⇒ Boolean

Returns:

  • (Boolean) 


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

def perf_logging?
  @perf_logging ||= !ENV.fetch('MILK_TEA_LSP_PERF', nil).to_s.empty?
end

#perf_verbose? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 11

def perf_verbose?
  @perf_verbose ||= ENV.fetch('MILK_TEA_LSP_PERF', nil).to_s == 'verbose'
end

#position_in_range?(line, char, start_line, start_char, end_line, end_char) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 460

def position_in_range?(line, char, start_line, start_char, end_line, end_char)
  after_start = (line > start_line) || (line == start_line && char >= start_char)
  before_end = (line < end_line) || (line == end_line && char <= end_char)
  after_start && before_end
end

#refresh_open_document_dependency_state(changed_uri, previous_content: nil, current_content: nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 217

def refresh_open_document_dependency_state(changed_uri, previous_content: nil, current_content: nil)
  return [] unless dependency_refresh_required_for_edit?(changed_uri, previous_content, current_content)

  affected_uris = @workspace.refresh_open_document_dependency_caches(changed_uri)
  invalidate_document_caches_for(affected_uris)
  affected_uris.each do |affected_uri|
    schedule_diagnostics(affected_uri, force: true, lint_tier: :full) unless @workspace.background_document?(affected_uri)
  end
  affected_uris
end

#request_cancelled?(id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 228

def request_cancelled?(id)
  return false if id.nil?

  @cancelled_requests_mutex.synchronize do
    @cancelled_request_ids.include?(id)
  end
end

#self_describing_argument_expression?(tokens, arg_tok) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 416

def self_describing_argument_expression?(tokens, arg_tok)
  arg_index = tokens.index(arg_tok)
  return false unless arg_index

  simple_identifier_like_argument_expression?(tokens, arg_index)
end

#shorten_uri(uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 119

def shorten_uri(uri)
  return nil unless uri
  return uri unless uri.is_a?(String) && uri.start_with?('file://')

  file_path = uri_to_path(uri)
  return uri unless file_path

  root_path = uri_to_path(@root_uri)
  return uri unless root_path

  begin
    relative = Pathname.new(file_path).relative_path_from(Pathname.new(root_path)).to_s
    return relative unless relative.start_with?('..')
  rescue StandardError
    # Keep the original URI if path normalization fails.
  end

  uri
end

#show_message(type, message) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 466

def show_message(type, message)
  @protocol.write_notification("window/showMessage", {
    type: MESSAGE_TYPES[type] || type,
    message: message,
  })
end

#show_message_request(type, message, actions:, &callback) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 480

def show_message_request(type, message, actions:, &callback)
  if @protocol.respond_to?(:send_request)
    @protocol.send_request('window/showMessageRequest', {
      type: MESSAGE_TYPES[type] || type,
      message: message,
      actions: actions.map { |title| { title: title } }
    }) do |result, error|
      if error
        callback.call(nil)
      elsif result.is_a?(Hash) && result['title']
        callback.call(result['title'])
      else
        callback.call(nil)
      end
    end
  else
    Protocol.send_request('window/showMessageRequest', {
      type: MESSAGE_TYPES[type] || type,
      message: message,
      actions: actions.map { |title| { title: title } }
    }) do |result, error|
      if error
        callback.call(nil)
      elsif result.is_a?(Hash) && result['title']
        callback.call(result['title'])
      else
        callback.call(nil)
      end
    end
  end
end

#simple_identifier_like_argument_expression?(tokens, start_index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 423

def simple_identifier_like_argument_expression?(tokens, start_index)
  saw_identifier = false
  expect_identifier = true
  i = start_index

  while i < tokens.length
    tok = tokens[i]
    break if [:comma, :rparen].include?(tok.type)
    return false if [:newline, :indent, :dedent].include?(tok.type)

    if expect_identifier
      return false unless tok.type == :identifier

      saw_identifier = true
      expect_identifier = false
    else
      return false unless tok.type == :dot

      expect_identifier = true
    end

    i += 1
  end

  saw_identifier && !expect_identifier
end

#skip_expensive_source_fix_all?(uri, content) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/utilities.rb', line 160

def skip_expensive_source_fix_all?(uri, content)
  !skip_expensive_work_reason(uri, content).nil?
rescue StandardError
  false
end

#skip_expensive_work_reason(uri, content) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 166

def skip_expensive_work_reason(uri, content)
  return 'library-uri' if library_uri?(uri)

  # Heuristic thresholds to avoid expensive full-file lint-fix runs.
  return 'large-bytes' if content.bytesize > 200_000
  return 'large-lines' if content.count("\n") > 1200

  nil
rescue StandardError
  nil
end

#summarize_lsp_params(method_name, params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 81

def summarize_lsp_params(method_name, params)
  return "" unless params.is_a?(Hash)

  text_document = hget(params, 'textDocument')
  uri = text_document.is_a?(Hash) ? hget(text_document, 'uri') : nil
  file_path = uri_to_path(uri)
  short_uri = shorten_uri(uri)
  position = hget(params, 'position')
  line = position.is_a?(Hash) ? hget(position, 'line') : nil
  char = position.is_a?(Hash) ? hget(position, 'character') : nil
  pos = "#{line}:#{char}" if line && char
  query = hget(params, 'query')

  bits = []
  bits << "uri=#{short_uri || uri}" if uri
  bits << "pos=#{pos}" if pos
  if file_path && line.is_a?(Integer) && char.is_a?(Integer)
    bits << "loc=#{file_path}:#{line + 1}:#{char + 1}"
  end
  bits << "query=#{query.inspect}" if query
  bits << "keys=#{params.keys.map(&:to_s).sort.join(',')}" unless params.empty?

  if method_name == 'textDocument/didChange'
    changes = hget(params, 'contentChanges')
    bits << "changes=#{changes.length}" if changes.respond_to?(:length)
  end

  bits.join(' ')
rescue StandardError
  ""
end

#symbol_kind(kind) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 279

def symbol_kind(kind)
  case kind
  when 'function'   then 12 # Function
  when 'interface'  then 11 # Interface
  when 'struct'     then 23 # Struct
  when 'union'      then 23 # Struct (union is a struct variant)
  when 'enum'       then 10 # Enum
  when 'flags'      then 10 # Enum (flags is an enum variant)
  when 'variant'    then 23 # Struct (variant is a struct variant)
  when 'type_alias' then 5  # Class
  when 'constant'   then 14 # Constant
  when 'variable'   then 13 # Variable
  when 'event'      then 24 # Event
  when 'type_param' then 26 # TypeParameter
  else 1 # File
  end
end

#token_end_position(token) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 321

def token_end_position(token)
  segments = token.lexeme.split("\n", -1)
  if segments.length == 1
    [token.line - 1, token.column - 1 + segments.first.length]
  else
    [token.line - 1 + segments.length - 1, segments.last.length]
  end
end

#token_to_range(token) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 309

def token_to_range(token)
  end_line, end_character = token_end_position(token)
  start_line = token.line - 1
  start_char = encode_char_for_client(start_line, token.column - 1)
  end_char = encode_char_for_client(end_line, end_character)

  {
    start: { line: start_line, character: start_char },
    end:   { line: end_line, character: end_char }
  }
end

#uri_to_path(uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 139

def uri_to_path(uri)
  parsed = URI.parse(uri)
  return nil unless parsed.scheme == 'file'

  CGI.unescape(parsed.path)
rescue URI::InvalidURIError
  nil
end

#utf32_to_utf16_char(line_text, utf32_offset) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 366

def utf32_to_utf16_char(line_text, utf32_offset)
  utf16_count = 0
  line_text.each_char.with_index do |ch, idx|
    break if idx >= utf32_offset
    utf16_count += ch.ord > 0xFFFF ? 2 : 1
  end
  utf16_count
end

#utf8_to_utf16_char(line_text, utf8_offset) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/utilities.rb', line 355

def utf8_to_utf16_char(line_text, utf8_offset)
  bytes_seen = 0
  utf16_count = 0
  line_text.each_char do |ch|
    break if bytes_seen >= utf8_offset
    bytes_seen += ch.bytesize
    utf16_count += ch.ord > 0xFFFF ? 2 : 1
  end
  utf16_count
end