Class: RubySyntaxLsp

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_syntax_lsp/cli.rb,
lib/ruby_syntax_lsp/core.rb,
lib/ruby_syntax_lsp/version.rb

Constant Summary collapse

VERSION = 
"0.0.3"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(writer, reader, level) ⇒ RubySyntaxLsp

Returns a new instance of RubySyntaxLsp.



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# File 'lib/ruby_syntax_lsp/core.rb', line 9

def initialize(writer, reader, level)
  @writer = writer
  @reader = reader
  @logger = Logger.new(STDERR, level: level)
end

Class Method Details

.cli ⇒ Object 



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# File 'lib/ruby_syntax_lsp/cli.rb', line 8

def self.cli
  options = {
    log_level: :info,
  }
  opts = OptionParser.new("Usage: ruby_syntax_lsp [options]")

  opts.on("--log LEVEL", "Set log level (debug, info, warn, error, fatal)") do |v|
    options[:log_level] = level.to_sym
  end

  opts.on("--verbose", "Set log level to debug") do
    options[:log_level] = :debug
  end

  opts.version = RubySyntaxLsp::VERSION

  opts.parse!

  reader = LSP::Transport::Stdio::Reader.new
  writer = LSP::Transport::Stdio::Writer.new

  RubySyntaxLsp.new(writer, reader, options[:log_level]).start
end

Instance Method Details

#request_initialize(id, params) ⇒ Object 



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# File 'lib/ruby_syntax_lsp/core.rb', line 42

def request_initialize(id, params)
  @writer.write(
    id: id,
    result: LSP::Interface::InitializeResult.new(
      capabilities: LSP::Interface::ServerCapabilities.new(
        text_document_sync: LSP::Interface::TextDocumentSyncOptions.new(
          change: LSP::Constant::TextDocumentSyncKind::FULL,
        ),
      ),
    ),
  )
end

#request_initialized(id, params) ⇒ Object 



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# File 'lib/ruby_syntax_lsp/core.rb', line 55

def request_initialized(id, params)
  # none
end

#request_text_document_did_change(id, params) ⇒ Object 



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# File 'lib/ruby_syntax_lsp/core.rb', line 59

def request_text_document_did_change(id, params)
  @writer.write(
    method: "textDocument/publishDiagnostics",
    params: {
      uri: params[:textDocument][:uri],
      diagnostics: params[:contentChanges].filter_map do |change|
        text = change[:text]
        begin
          RubyVM::InstructionSequence.compile(text)
        rescue SyntaxError => e
          @logger.info("SyntaxError detected:\n#{e.message}")
          lines = text.lines
          e.message.split(/^<compiled>:(?=\d+: )/m)[1..].map do |error|
            @logger.info("Parsing this error message:\n#{error}")
            lineno_s, message = error.split(": ", 2)
            lineno = lineno_s.strip.to_i
            @logger.info("Line number: #{lineno}")
            range = if message.lines.length > 1 # Message has `^`
                pos_start = message.lines[2].delete_prefix("...").index("^")
                if message.lines[1].start_with?("...")
                  pos_start += lines[lineno - 1].index(message.lines[1].delete_prefix("...").delete_suffix("..."))
                end
                pos_end = pos_start + message.lines[2].count("~") + 1

                @logger.info("line: #{lineno}, position: #{pos_start}-#{pos_end}")
                LSP::Interface::Range.new(
                  start: LSP::Interface::Position.new(line: lineno - 1, character: pos_start),
                  end: LSP::Interface::Position.new(line: lineno - 1, character: pos_end),
                )
              else
                @logger.info("line: #{lineno}, no position")
                LSP::Interface::Range.new(
                  start: LSP::Interface::Position.new(line: lineno - 1, character: 0),
                  end: LSP::Interface::Position.new(line: lineno - 1, character: lines[lineno - 1].length - 1),
                )
              end
            LSP::Interface::Diagnostic.new(
              range: range,
              severity: LSP::Constant::DiagnosticSeverity::ERROR,
              message: message.lines[0].strip.sub(/^syntax error, /, ""),
              source: "Ruby Syntax LSP",
            )
          end
        else
          @logger.info("No SyntaxError")
          nil
        end
      end.flatten,
    },
  )
end

#start ⇒ Object 



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# File 'lib/ruby_syntax_lsp/core.rb', line 15

def start
  @logger.info "Started Ruby Syntax LSP server..."
  @reader.read do |request|
    break if request[:method] == "shutdown"
    method_name = ("request_" + request[:method].gsub(/[A-Z]/) { |m| "_#{m.downcase}" }.gsub("/", "_")).to_sym
    if respond_to?(method_name)
      @logger.debug "Received supported method: #{method_name}"
      begin
        send(method_name, request[:id], request[:params])
      rescue => e
        @logger.error "Error: #{e.full_message}"
        @writer.write(
          code: -32603,
          message: e.message,
        )
      end
    elsif request[:method].start_with?("$/")
      @logger.debug "Received unsupported method: #{request[:method]}"
    else
      @writer.write(
        code: -32601,
        message: "Method not implemented: #{request[:method]}",
      )
    end
  end
end