20569579414

Committed 29 Dec 2025 09:31AM UTC coverage: 80.005% (+0.9%) from 79.076%

Build # 20569579414

Build Type

Pull #30

github

Committed by

web-flow

Commit Message

Merge 6db8c3a50 into a7c451da7

Pull Request Pull Request #30: feat: improve error messages with tsc-style diagnostics

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10 existing lines in 4 files now uncovered.

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70.37

/lib/t_ruby/lsp_server.rb

# frozen_string_literal: true

require "json"

module TRuby
  # LSP (Language Server Protocol) Server for T-Ruby
  # Provides IDE integration with autocomplete, diagnostics, and navigation
  class LSPServer
    VERSION = "0.1.0"

    # LSP Error codes
    module ErrorCodes
      PARSE_ERROR = -32_700
      INVALID_REQUEST = -32_600
      METHOD_NOT_FOUND = -32_601
      INVALID_PARAMS = -32_602
      INTERNAL_ERROR = -32_603
      SERVER_NOT_INITIALIZED = -32_002
      UNKNOWN_ERROR_CODE = -32_001
    end

    # LSP Completion item kinds
    module CompletionItemKind
      TEXT = 1
      METHOD = 2
      FUNCTION = 3
      CONSTRUCTOR = 4
      FIELD = 5
      VARIABLE = 6
      CLASS = 7
      INTERFACE = 8
      MODULE = 9
      PROPERTY = 10
      UNIT = 11
      VALUE = 12
      ENUM = 13
      KEYWORD = 14
      SNIPPET = 15
      COLOR = 16
      FILE = 17
      REFERENCE = 18
      FOLDER = 19
      ENUM_MEMBER = 20
      CONSTANT = 21
      STRUCT = 22
      EVENT = 23
      OPERATOR = 24
      TYPE_PARAMETER = 25
    end

    # LSP Diagnostic severity
    module DiagnosticSeverity
      ERROR = 1
      WARNING = 2
      INFORMATION = 3
      HINT = 4
    end

    # Semantic Token Types (LSP 3.16+)
    module SemanticTokenTypes
      NAMESPACE = 0
      TYPE = 1
      CLASS = 2
      ENUM = 3
      INTERFACE = 4
      STRUCT = 5
      TYPE_PARAMETER = 6
      PARAMETER = 7
      VARIABLE = 8
      PROPERTY = 9
      ENUM_MEMBER = 10
      EVENT = 11
      FUNCTION = 12
      METHOD = 13
      MACRO = 14
      KEYWORD = 15
      MODIFIER = 16
      COMMENT = 17
      STRING = 18
      NUMBER = 19
      REGEXP = 20
      OPERATOR = 21
    end

    # Semantic Token Modifiers (bit flags)
    module SemanticTokenModifiers
      DECLARATION = 0x01
      DEFINITION = 0x02
      READONLY = 0x04
      STATIC = 0x08
      DEPRECATED = 0x10
      ABSTRACT = 0x20
      ASYNC = 0x40
      MODIFICATION = 0x80
      DOCUMENTATION = 0x100
      DEFAULT_LIBRARY = 0x200
    end

    # Token type names for capability registration
    SEMANTIC_TOKEN_TYPES = %w[
      namespace type class enum interface struct typeParameter
      parameter variable property enumMember event function method
      macro keyword modifier comment string number regexp operator
    ].freeze

    # Token modifier names
    SEMANTIC_TOKEN_MODIFIERS = %w[
      declaration definition readonly static deprecated
      abstract async modification documentation defaultLibrary
    ].freeze

    # Built-in types for completion
    BUILT_IN_TYPES = %w[String Integer Boolean Array Hash Symbol void nil].freeze

    # Type keywords for completion
    TYPE_KEYWORDS = %w[type interface def end].freeze

    def initialize(input: $stdin, output: $stdout)
      @input = input
      @output = output
      @documents = {}
      @initialized = false
      @shutdown_requested = false
      @type_alias_registry = TypeAliasRegistry.new
      # Use Compiler for unified diagnostics (same as CLI)
      @compiler = Compiler.new
    end

    # Main run loop for the LSP server
    def run
      loop do
        message = read_message
        break if message.nil?

        response = handle_message(message)
        send_response(response) if response
      end
    end

    # Read a single LSP message from input
    def read_message
      # Read headers
      headers = {}
      loop do
        line = @input.gets
        return nil if line.nil?

        line = line.strip
        break if line.empty?

        if line =~ /^([^:]+):\s*(.+)$/
          headers[Regexp.last_match(1)] = Regexp.last_match(2)
        end
      end

      content_length = headers["Content-Length"]&.to_i
      return nil unless content_length&.positive?

      # Read content
      content = @input.read(content_length)
      return nil if content.nil?

      JSON.parse(content)
    rescue JSON::ParserError => e
      { "error" => "Parse error: #{e.message}" }
    end

    # Send a response message
    def send_response(response)
      return if response.nil?

      content = JSON.generate(response)
      message = "Content-Length: #{content.bytesize}\r\n\r\n#{content}"
      @output.write(message)
      @output.flush
    end

    # Send a notification (no response expected)
    def send_notification(method, params)
      notification = {
        "jsonrpc" => "2.0",
        "method" => method,
        "params" => params,
      }
      send_response(notification)
    end

    # Handle an incoming message
    def handle_message(message)
      return error_response(nil, ErrorCodes::PARSE_ERROR, "Parse error") if message["error"]

      method = message["method"]
      params = message["params"] || {}
      id = message["id"]

      # Check if server is initialized for non-init methods
      if !@initialized && method != "initialize" && method != "exit"
        return error_response(id, ErrorCodes::SERVER_NOT_INITIALIZED, "Server not initialized")
      end

      result = dispatch_method(method, params, id)

      # For notifications (no id), don't send a response
      return nil if id.nil?

      if result.is_a?(Hash) && result[:error]
        error_response(id, result[:error][:code], result[:error][:message])
      else
        success_response(id, result)
      end
    end

    private

    def dispatch_method(method, params, _id)
      case method
      when "initialize"
        handle_initialize(params)
      when "initialized"
        handle_initialized(params)
      when "shutdown"
        handle_shutdown
      when "exit"
        handle_exit
      when "textDocument/didOpen"
        handle_did_open(params)
      when "textDocument/didChange"
        handle_did_change(params)
      when "textDocument/didClose"
        handle_did_close(params)
      when "textDocument/completion"
        handle_completion(params)
      when "textDocument/hover"
        handle_hover(params)
      when "textDocument/definition"
        handle_definition(params)
      when "textDocument/semanticTokens/full"
        handle_semantic_tokens_full(params)
      when "textDocument/diagnostic"
        handle_diagnostic(params)
      else
        { error: { code: ErrorCodes::METHOD_NOT_FOUND, message: "Method not found: #{method}" } }
      end
    end

    # === LSP Lifecycle Methods ===

    def handle_initialize(params)
      @initialized = true
      @root_uri = params["rootUri"]
      @workspace_folders = params["workspaceFolders"]

      {
        "capabilities" => {
          "textDocumentSync" => {
            "openClose" => true,
            "change" => 1, # Full sync
            "save" => { "includeText" => true },
          },
          "completionProvider" => {
            "triggerCharacters" => [":", "<", "|", "&"],
            "resolveProvider" => false,
          },
          "hoverProvider" => true,
          "definitionProvider" => true,
          "diagnosticProvider" => {
            "interFileDependencies" => false,
            "workspaceDiagnostics" => false,
          },
          "semanticTokensProvider" => {
            "legend" => {
              "tokenTypes" => SEMANTIC_TOKEN_TYPES,
              "tokenModifiers" => SEMANTIC_TOKEN_MODIFIERS,
            },
            "full" => true,
            "range" => false,
          },
        },
        "serverInfo" => {
          "name" => "t-ruby-lsp",
          "version" => VERSION,
        },
      }
    end

    def handle_initialized(_params)
      # Server is now fully initialized
      nil
    end

    def handle_shutdown
      @shutdown_requested = true
      nil
    end

    def handle_exit
      exit(@shutdown_requested ? 0 : 1)
    end

    # === Document Synchronization ===

    def handle_did_open(params)
      text_document = params["textDocument"]
      uri = text_document["uri"]
      text = text_document["text"]

      @documents[uri] = {
        text: text,
        version: text_document["version"],
      }

      # Parse and send diagnostics
      publish_diagnostics(uri, text)
      nil
    end

    def handle_did_change(params)
      text_document = params["textDocument"]
      uri = text_document["uri"]
      changes = params["contentChanges"]

      # For full sync, take the last change
      if changes && !changes.empty?
        @documents[uri] = {
          text: changes.last["text"],
          version: text_document["version"],
        }

        # Re-parse and send diagnostics
        publish_diagnostics(uri, changes.last["text"])
      end
      nil
    end

    def handle_did_close(params)
      uri = params["textDocument"]["uri"]
      @documents.delete(uri)

      # Clear diagnostics
      send_notification("textDocument/publishDiagnostics", {
                          "uri" => uri,
                          "diagnostics" => [],
                        })
      nil
    end

    # === Diagnostics ===

    # Handle pull-based diagnostics (LSP 3.17+)
    def handle_diagnostic(params)
      uri = params.dig("textDocument", "uri")
      return { "kind" => "full", "items" => [] } unless uri

      doc = @documents[uri]
      return { "kind" => "full", "items" => [] } unless doc

      text = doc[:text]
      return { "kind" => "full", "items" => [] } unless text

      diagnostics = analyze_document(text)
      { "kind" => "full", "items" => diagnostics }
    end

    def publish_diagnostics(uri, text)
      diagnostics = analyze_document(text)

      send_notification("textDocument/publishDiagnostics", {
                          "uri" => uri,
                          "diagnostics" => diagnostics,
                        })
    end

    def analyze_document(text, uri: nil)
      # Use unified Compiler.analyze for diagnostics
      # This ensures CLI and LSP show the same errors
      file_path = uri ? uri_to_path(uri) : "<source>"
      compiler_diagnostics = @compiler.analyze(text, file: file_path)

      # Convert TRuby::Diagnostic objects to LSP diagnostic format
      compiler_diagnostics.map { |d| diagnostic_to_lsp(d) }
    end

    # Convert TRuby::Diagnostic to LSP diagnostic format
    def diagnostic_to_lsp(diagnostic)
      # LSP uses 0-based line numbers
      line = (diagnostic.line || 1) - 1
      line = 0 if line.negative?

      col = (diagnostic.column || 1) - 1
      col = 0 if col.negative?

      end_col = diagnostic.end_column ? diagnostic.end_column - 1 : col + 1

      severity = case diagnostic.severity
                 when :error then DiagnosticSeverity::ERROR
                 when :warning then DiagnosticSeverity::WARNING
                 when :info then DiagnosticSeverity::INFORMATION
                 else DiagnosticSeverity::ERROR
                 end

      lsp_diag = {
        "range" => {
          "start" => { "line" => line, "character" => col },
          "end" => { "line" => line, "character" => end_col },
        },
        "severity" => severity,
        "source" => "t-ruby",
        "message" => diagnostic.message,
      }

      # Add error code if available
      lsp_diag["code"] = diagnostic.code if diagnostic.code

      lsp_diag
    end

    def uri_to_path(uri)
      # Convert file:// URI to filesystem path
      return uri unless uri.start_with?("file://")

      uri.sub(%r{^file://}, "")
    end

    def create_diagnostic(line, message, severity)
      {
        "range" => {
          "start" => { "line" => line, "character" => 0 },
          "end" => { "line" => line, "character" => 1000 },
        },
        "severity" => severity,
        "source" => "t-ruby",
        "message" => message,
      }
    end

    # === Completion ===

    def handle_completion(params)
      uri = params["textDocument"]["uri"]
      position = params["position"]

      document = @documents[uri]
      return { "items" => [] } unless document

      text = document[:text]
      lines = text.split("\n")
      line = lines[position["line"]] || ""
      char_pos = position["character"]

      # Get the text before cursor
      prefix = line[0...char_pos] || ""

      completions = []

      # Context-aware completion
      case prefix
      when /:\s*$/
        # After colon - suggest types
        completions.concat(type_completions)
      when /\|\s*$/
        # After pipe - suggest types for union
        completions.concat(type_completions)
      when /&\s*$/
        # After ampersand - suggest types for intersection
        completions.concat(type_completions)
      when /<\s*$/
        # Inside generic - suggest types
        completions.concat(type_completions)
      when /^\s*$/
        # Start of line - suggest keywords
        completions.concat(keyword_completions)
      when /^\s*def\s+\w*$/
        # Function definition - no completion needed
        completions = []
      when /^\s*type\s+\w*$/
        # Type alias definition - no completion needed
        completions = []
      when /^\s*interface\s+\w*$/
        # Interface definition - no completion needed
        completions = []
      else
        # Default - suggest all
        completions.concat(type_completions)
        completions.concat(keyword_completions)
      end

      # Add document-specific completions
      completions.concat(document_type_completions(text))

      { "items" => completions }
    end

    def type_completions
      BUILT_IN_TYPES.map do |type|
        {
          "label" => type,
          "kind" => CompletionItemKind::CLASS,
          "detail" => "Built-in type",
          "documentation" => "T-Ruby built-in type: #{type}",
        }
      end
    end

    def keyword_completions
      TYPE_KEYWORDS.map do |keyword|
        {
          "label" => keyword,
          "kind" => CompletionItemKind::KEYWORD,
          "detail" => "Keyword",
          "documentation" => keyword_documentation(keyword),
        }
      end
    end

    def keyword_documentation(keyword)
      case keyword
      when "type"
        "Define a type alias: type AliasName = TypeDefinition"
      when "interface"
        "Define an interface: interface Name ... end"
      when "def"
        "Define a function with type annotations: def name(param: Type): ReturnType"
      when "end"
        "End a block (interface, class, method, etc.)"
      else
        keyword
      end
    end

    def document_type_completions(text)
      parser = Parser.new(text)
      result = parser.parse

      # Add type aliases from the document
      completions = (result[:type_aliases] || []).map do |alias_info|
        {
          "label" => alias_info[:name],
          "kind" => CompletionItemKind::CLASS,
          "detail" => "Type alias",
          "documentation" => "type #{alias_info[:name]} = #{alias_info[:definition]}",
        }
      end

      # Add interfaces from the document
      (result[:interfaces] || []).each do |interface_info|
        completions << {
          "label" => interface_info[:name],
          "kind" => CompletionItemKind::INTERFACE,
          "detail" => "Interface",
          "documentation" => "interface #{interface_info[:name]}",
        }
      end

      completions
    end

    # === Hover ===

    def handle_hover(params)
      uri = params["textDocument"]["uri"]
      position = params["position"]

      document = @documents[uri]
      return nil unless document

      text = document[:text]
      lines = text.split("\n")
      line = lines[position["line"]] || ""
      char_pos = position["character"]

      # Find the word at cursor position
      word = extract_word_at_position(line, char_pos)
      return nil if word.nil? || word.empty?

      hover_info = get_hover_info(word, text)
      return nil unless hover_info

      {
        "contents" => {
          "kind" => "markdown",
          "value" => hover_info,
        },
        "range" => word_range(position["line"], line, char_pos, word),
      }
    end

    def extract_word_at_position(line, char_pos)
      return nil if char_pos > line.length

      # Find word boundaries
      start_pos = char_pos
      end_pos = char_pos

      # Move start back to word start
      start_pos -= 1 while start_pos.positive? && line[start_pos - 1] =~ /[\w<>]/

      # Move end forward to word end
      end_pos += 1 while end_pos < line.length && line[end_pos] =~ /[\w<>]/

      return nil if start_pos == end_pos

      line[start_pos...end_pos]
    end

    def word_range(line_num, line, char_pos, word)
      start_pos = line.index(word) || char_pos
      end_pos = start_pos + word.length

      {
        "start" => { "line" => line_num, "character" => start_pos },
        "end" => { "line" => line_num, "character" => end_pos },
      }
    end

    def get_hover_info(word, text)
      # Check if it's a built-in type
      if BUILT_IN_TYPES.include?(word)
        return "**#{word}** - Built-in T-Ruby type"
      end

      # Check if it's a type alias
      parser = Parser.new(text)
      result = parser.parse

      (result[:type_aliases] || []).each do |alias_info|
        if alias_info[:name] == word
          return "**Type Alias**\n\n```ruby\ntype #{alias_info[:name]} = #{alias_info[:definition]}\n```"
        end
      end

      # Check if it's an interface
      (result[:interfaces] || []).each do |interface_info|
        if interface_info[:name] == word
          members = interface_info[:members].map { |m| "  #{m[:name]}: #{m[:type]}" }.join("\n")
          return "**Interface**\n\n```ruby\ninterface #{interface_info[:name]}\n#{members}\nend\n```"
        end
      end

      # Check if it's a function
      (result[:functions] || []).each do |func|
        next unless func[:name] == word

        params = func[:params].map { |p| "#{p[:name]}: #{p[:type] || "untyped"}" }.join(", ")
        return_type = func[:return_type] || "void"
        return "**Function**\n\n```ruby\ndef #{func[:name]}(#{params}): #{return_type}\n```"
      end

      nil
    end

    # === Definition ===

    def handle_definition(params)
      uri = params["textDocument"]["uri"]
      position = params["position"]

      document = @documents[uri]
      return nil unless document

      text = document[:text]
      lines = text.split("\n")
      line = lines[position["line"]] || ""
      char_pos = position["character"]

      word = extract_word_at_position(line, char_pos)
      return nil if word.nil? || word.empty?

      # Find definition location
      location = find_definition(word, text, uri)
      return nil unless location

      location
    end

    def find_definition(word, text, uri)
      lines = text.split("\n")

      # Search for type alias definition
      lines.each_with_index do |line, idx|
        if line.match?(/^\s*type\s+#{Regexp.escape(word)}\s*=/)
          return {
            "uri" => uri,
            "range" => {
              "start" => { "line" => idx, "character" => 0 },
              "end" => { "line" => idx, "character" => line.length },
            },
          }
        end

        # Search for interface definition
        if line.match?(/^\s*interface\s+#{Regexp.escape(word)}\s*$/)
          return {
            "uri" => uri,
            "range" => {
              "start" => { "line" => idx, "character" => 0 },
              "end" => { "line" => idx, "character" => line.length },
            },
          }
        end

        # Search for function definition
        if line.match?(/^\s*def\s+#{Regexp.escape(word)}\s*\(/)
          return {
            "uri" => uri,
            "range" => {
              "start" => { "line" => idx, "character" => 0 },
              "end" => { "line" => idx, "character" => line.length },
            },
          }
        end
      end

      nil
    end

    # === Semantic Tokens ===

    def handle_semantic_tokens_full(params)
      uri = params["textDocument"]["uri"]
      document = @documents[uri]
      return { "data" => [] } unless document

      text = document[:text]
      tokens = generate_semantic_tokens(text)

      { "data" => tokens }
    end

    def generate_semantic_tokens(text)
      lines = text.split("\n")

      # Parse the document to get IR
      parser = Parser.new(text)
      parse_result = parser.parse
      parser.ir_program

      # Collect all tokens from parsing
      raw_tokens = []

      # Process type aliases
      (parse_result[:type_aliases] || []).each do |alias_info|
        lines.each_with_index do |line, line_idx|
          next unless (match = line.match(/^\s*type\s+(#{Regexp.escape(alias_info[:name])})\s*=/))

          # 'type' keyword
          type_pos = line.index("type")
          raw_tokens << [line_idx, type_pos, 4, SemanticTokenTypes::KEYWORD, SemanticTokenModifiers::DECLARATION]

          # Type name
          name_pos = match.begin(1)
          raw_tokens << [line_idx, name_pos, alias_info[:name].length, SemanticTokenTypes::TYPE, SemanticTokenModifiers::DEFINITION]

          # Type definition (after =)
          add_type_tokens(raw_tokens, line, line_idx, alias_info[:definition])
        end
      end

      # Process interfaces
      (parse_result[:interfaces] || []).each do |interface_info|
        lines.each_with_index do |line, line_idx|
          if (match = line.match(/^\s*interface\s+(#{Regexp.escape(interface_info[:name])})/))
            # 'interface' keyword
            interface_pos = line.index("interface")
            raw_tokens << [line_idx, interface_pos, 9, SemanticTokenTypes::KEYWORD, SemanticTokenModifiers::DECLARATION]

            # Interface name
            name_pos = match.begin(1)
            raw_tokens << [line_idx, name_pos, interface_info[:name].length, SemanticTokenTypes::INTERFACE, SemanticTokenModifiers::DEFINITION]
          end

          # Interface members
          interface_info[:members]&.each do |member|
            next unless (match = line.match(/^\s*(#{Regexp.escape(member[:name])})\s*:\s*/))

            prop_pos = match.begin(1)
            raw_tokens << [line_idx, prop_pos, member[:name].length, SemanticTokenTypes::PROPERTY, 0]

            # Member type
            add_type_tokens(raw_tokens, line, line_idx, member[:type])
          end
        end
      end

      # Process functions
      (parse_result[:functions] || []).each do |func|
        lines.each_with_index do |line, line_idx|
          next unless (match = line.match(/^\s*def\s+(#{Regexp.escape(func[:name])})\s*\(/))

          # 'def' keyword
          def_pos = line.index("def")
          raw_tokens << [line_idx, def_pos, 3, SemanticTokenTypes::KEYWORD, 0]

          # Function name
          name_pos = match.begin(1)
          raw_tokens << [line_idx, name_pos, func[:name].length, SemanticTokenTypes::FUNCTION, SemanticTokenModifiers::DEFINITION]

          # Parameters
          func[:params]&.each do |param|
            next unless (param_match = line.match(/\b(#{Regexp.escape(param[:name])})\s*(?::\s*)?/))

            param_pos = param_match.begin(1)
            raw_tokens << [line_idx, param_pos, param[:name].length, SemanticTokenTypes::PARAMETER, 0]

            # Parameter type if present
            if param[:type]
              add_type_tokens(raw_tokens, line, line_idx, param[:type])
            end
          end

          # Return type
          if func[:return_type]
            add_type_tokens(raw_tokens, line, line_idx, func[:return_type])
          end
        end
      end

      # Process 'end' keywords
      lines.each_with_index do |line, line_idx|
        if (match = line.match(/^\s*(end)\s*$/))
          end_pos = match.begin(1)
          raw_tokens << [line_idx, end_pos, 3, SemanticTokenTypes::KEYWORD, 0]
        end
      end

      # Sort tokens by line, then by character position
      raw_tokens.sort_by! { |t| [t[0], t[1]] }

      # Convert to delta encoding
      encode_tokens(raw_tokens)
    end

    def add_type_tokens(raw_tokens, line, line_idx, type_str)
      return unless type_str

      # Find position of the type in the line
      pos = line.index(type_str)
      return unless pos

      # Handle built-in types
      if BUILT_IN_TYPES.include?(type_str)
        raw_tokens << [line_idx, pos, type_str.length, SemanticTokenTypes::TYPE, SemanticTokenModifiers::DEFAULT_LIBRARY]
        return
      end

      # Handle generic types like Array<String>
      if type_str.include?("<")
        if (match = type_str.match(/^(\w+)<(.+)>$/))
          base = match[1]
          base_pos = line.index(base, pos)
          if base_pos
            modifier = BUILT_IN_TYPES.include?(base) ? SemanticTokenModifiers::DEFAULT_LIBRARY : 0
            raw_tokens << [line_idx, base_pos, base.length, SemanticTokenTypes::TYPE, modifier]
          end
          # Recursively process type arguments
          # (simplified - just mark them as types)
          args = match[2]
          args.split(/[,\s]+/).each do |arg|
            arg = arg.strip.gsub(/[<>]/, "")
            next if arg.empty?

            arg_pos = line.index(arg, pos)
            if arg_pos
              modifier = BUILT_IN_TYPES.include?(arg) ? SemanticTokenModifiers::DEFAULT_LIBRARY : 0
              raw_tokens << [line_idx, arg_pos, arg.length, SemanticTokenTypes::TYPE, modifier]
            end
          end
        end
        return
      end

      # Handle union types
      if type_str.include?("|")
        type_str.split("|").map(&:strip).each do |t|
          t_pos = line.index(t, pos)
          if t_pos
            modifier = BUILT_IN_TYPES.include?(t) ? SemanticTokenModifiers::DEFAULT_LIBRARY : 0
            raw_tokens << [line_idx, t_pos, t.length, SemanticTokenTypes::TYPE, modifier]
          end
        end
        return
      end

      # Handle intersection types
      if type_str.include?("&")
        type_str.split("&").map(&:strip).each do |t|
          t_pos = line.index(t, pos)
          if t_pos
            modifier = BUILT_IN_TYPES.include?(t) ? SemanticTokenModifiers::DEFAULT_LIBRARY : 0
            raw_tokens << [line_idx, t_pos, t.length, SemanticTokenTypes::TYPE, modifier]
          end
        end
        return
      end

      # Simple type
      raw_tokens << [line_idx, pos, type_str.length, SemanticTokenTypes::TYPE, 0]
    end

    def encode_tokens(raw_tokens)
      encoded = []
      prev_line = 0
      prev_char = 0

      raw_tokens.each do |token|
        line, char, length, token_type, modifiers = token

        delta_line = line - prev_line
        delta_char = delta_line.zero? ? char - prev_char : char

        encoded << delta_line
        encoded << delta_char
        encoded << length
        encoded << token_type
        encoded << modifiers

        prev_line = line
        prev_char = char
      end

      encoded
    end

    # === Response Helpers ===

    def success_response(id, result)
      {
        "jsonrpc" => "2.0",
        "id" => id,
        "result" => result,
      }
    end

    def error_response(id, code, message)
      {
        "jsonrpc" => "2.0",
        "id" => id,
        "error" => {
          "code" => code,
          "message" => message,
        },
      }
    end
  end
end

type-ruby / t-ruby / 20569579414

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