Module: MilkTea::LSP::Server::ServerFormatting

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

Instance Method Summary collapse

Instance Method Details

#child_event_symbol(e) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 341

def child_event_symbol(e)
  return nil unless e.respond_to?(:name) && e.name && e.line

  parts = ["event[#{e.capacity}]"]
  parts << "(#{type_detail_string(e.payload_type)})" if e.respond_to?(:payload_type) && e.payload_type

  {
    name: e.name, kind: 24,
    detail: parts.join,
    range: { start: { line: e.line - 1, character: 0 }, end: { line: e.line, character: 0 } },
    selectionRange: {
      start: { line: e.line - 1, character: (e.column ? e.column - 1 : 0) },
      end: { line: e.line - 1, character: (e.column ? e.column - 1 + e.name.length : 0) },
    },
  }
end

#child_field_symbol(f) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 327

def child_field_symbol(f)
  return nil unless f.respond_to?(:name) && f.name && f.line
  detail = f.respond_to?(:type) ? type_detail_string(f.type) : nil
  {
    name: f.name, kind: 8,
    detail: detail,
    range: { start: { line: f.line - 1, character: 0 }, end: { line: f.line, character: 0 } },
    selectionRange: {
      start: { line: f.line - 1, character: (f.column ? f.column - 1 : 0) },
      end: { line: f.line - 1, character: (f.column ? f.column - 1 + f.name.length : 0) },
    },
  }.compact
end

#child_member_symbol(m, default_line: nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 358

def child_member_symbol(m, default_line: nil)
  line = (m.line) ? m.line : default_line
  return nil unless m.respond_to?(:name) && m.name && line

  col = m.column ? m.column : 1
  {
    name: m.name, kind: 22,
    range: { start: { line: line - 1, character: 0 }, end: { line: line, character: 0 } },
    selectionRange: {
      start: { line: line - 1, character: col - 1 },
      end: { line: line - 1, character: col - 1 + m.name.length },
    },
  }
end

#child_method_symbol(m) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 483

def child_method_symbol(m)
  return nil unless m.respond_to?(:name) && m.name && m.line

  detail_parts = []
  detail_parts << 'mut' if m.respond_to?(:kind) && m.kind == :editable_function
  detail_parts << 'static' if m.respond_to?(:kind) && m.kind == :static_function
  detail_parts << 'async' if m.respond_to?(:async) && m.async
  if (ret = type_detail_string(m.return_type))
    detail_parts << "-> #{ret}"
  end
  {
    name: m.name, kind: 6,
    range: { start: { line: m.line - 1, character: 0 }, end: { line: (m.respond_to?(:end_line) && m.end_line ? m.end_line : m.line), character: 0 } },
    selectionRange: {
      start: { line: m.line - 1, character: (m.column ? m.column - 1 : 0) },
      end: { line: m.line - 1, character: (m.column ? m.column - 1 + m.name.length : 0) },
    },
    detail: detail_parts.empty? ? nil : detail_parts.join(' '),
  }.compact
end

#child_nested_struct_symbol(nested) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 304

def child_nested_struct_symbol(nested)
  return nil unless nested.respond_to?(:name) && nested.name && nested.line

  grandchildren = child_symbols_for(nested)
  {
    name: nested.name, kind: 23,
    range: { start: { line: nested.line - 1, character: 0 }, end: { line: nested.line, character: 0 } },
    selectionRange: {
      start: { line: nested.line - 1, character: (nested.column ? nested.column - 1 : 0) },
      end: { line: nested.line - 1, character: (nested.column ? nested.column - 1 + nested.name.length : 0) },
    },
  }.tap { |s| s[:children] = grandchildren if grandchildren&.any? }
end

#child_parent_name(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 269

def child_parent_name(decl)
  case decl
  when AST::StructDecl then decl.name
  when AST::UnionDecl then decl.name
  when AST::EnumDecl then decl.name
  when AST::FlagsDecl then decl.name
  when AST::VariantDecl then decl.name
  when AST::InterfaceDecl then decl.name
  when AST::OpaqueDecl then decl.name
  when AST::ExtendingBlock then decl.type_name.name.parts.join('.')
  else nil
  end
end

#child_symbols_for(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 283

def child_symbols_for(decl)
  case decl
  when AST::StructDecl
    field_children = (decl.fields&.map { |f| child_field_symbol(f) } || []).compact
    nested_children = (decl.nested_types&.map { |n| child_nested_struct_symbol(n) } || []).compact
    event_children = (decl.events&.map { |e| child_event_symbol(e) } || []).compact
    field_children + nested_children + event_children
  when AST::UnionDecl
    (decl.fields&.map { |f| child_field_symbol(f) } || []).compact
  when AST::EnumDecl, AST::FlagsDecl
    (decl.members&.map { |m| child_member_symbol(m, default_line: decl.line) } || []).compact
  when AST::VariantDecl
    (decl.arms&.map { |a| child_variant_arm_symbol(a, default_line: decl.line) } || []).compact
  when AST::InterfaceDecl
    (decl.methods&.map { |m| child_method_symbol(m) } || []).compact
  when AST::ExtendingBlock
    (decl.methods&.map { |m| child_method_symbol(m) } || []).compact
  else nil
  end
end

#child_variant_arm_symbol(a, default_line: nil) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 373

def child_variant_arm_symbol(a, default_line: nil)
  line = (a.line) ? a.line : default_line
  return nil unless a.respond_to?(:name) && a.name && line
  col = a.column ? a.column : 1
  {
    name: a.name, kind: 22,
    range: { start: { line: line - 1, character: 0 }, end: { line: line, character: 0 } },
    selectionRange: {
      start: { line: line - 1, character: col - 1 },
      end: { line: line - 1, character: col - 1 + a.name.length },
    },
  }
end

#collect_local_decls(body) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 387

def collect_local_decls(body)
  return [] unless body

  case body
  when Array
    body.flat_map { |stmt| collect_local_decls(stmt) }.compact
  when AST::LocalDecl
    [body]
  when AST::IfStmt
    (body.branches || []).flat_map { |b| collect_local_decls(b.body) } +
      collect_local_decls(body.else_body)
  when AST::WhileStmt
    collect_local_decls(body.body)
  when AST::ForStmt
    collect_local_decls(body.body) + body.bindings
  when AST::MatchStmt
    (body.arms || []).flat_map { |arm| collect_local_decls(arm.body) }
  when AST::ParallelBlockStmt
    (body.bodies || []).flat_map { |b| collect_local_decls(b) }
  when AST::DeferStmt
    collect_local_decls(body.body)
  when AST::UnsafeStmt
    collect_local_decls(body.body)
  when AST::WhenStmt
    (body.branches || []).flat_map { |b| collect_local_decls(b.body) } +
      collect_local_decls(body.else_body)
  when AST::ErrorBlockStmt
    collect_local_decls(body.body)
  else
    []
  end
end

#collect_nested_type_names(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 318

def collect_nested_type_names(decl)
  names = []
  decl.nested_types.each do |nested|
    names << nested.name
    names.concat(collect_nested_type_names(nested))
  end
  names
end

#descendant_names(symbol) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 444

def descendant_names(symbol)
  return [] unless symbol[:children]

  symbol[:children].flat_map { |c| [c[:name]] + descendant_names(c) }
end

#enrich_with_children(symbols, ast) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 77

def enrich_with_children(symbols, ast)
  removed_local_names = []
  removed_method_names = []
  removed_nested_type_names = []
  removed_event_names = []
  name_index = symbols.each_with_object(Hash.new { |h, k| h[k] = [] }) { |s, h| h[s[:name]] << s }

  ast.declarations&.each do |decl|
    removed_nested_type_names.concat(collect_nested_type_names(decl)) if decl.is_a?(AST::StructDecl)

    case decl
    when AST::EventDecl
      parent = name_index[decl.name]&.find { |s| symbol_line(s) == (decl.line || 0) }
      next unless parent

      parts = ["event[#{decl.capacity}]"]
      parts << "(#{type_detail_string(decl.payload_type)})" if decl.payload_type
      parent[:detail] = parts.join

    when AST::FunctionDef
      parent = name_index[decl.name]&.find { |s| symbol_line(s) == (decl.line || 0) }
      next unless parent

      detail_parts = []
      detail_parts << 'const' if decl.respond_to?(:const) && decl.const
      detail_parts << 'async' if decl.respond_to?(:async) && decl.async
      if (ret = type_detail_string(decl.return_type))
        detail_parts << "-> #{ret}"
      end
      parent[:detail] = detail_parts.join(' ') unless detail_parts.empty?

      locals = collect_local_decls(decl.body)
      next unless locals&.any?

      parent[:children] ||= []
      parent_children = parent[:children]
      locals.each do |local|
        next unless local.name

        child = local_decl_symbol(local)
        next unless child

        parent_children << child unless parent_children.any? { |pc| pc[:name] == child[:name] }
        removed_local_names << local.name
        removed_local_names.concat(descendant_names(child))
      end
    when AST::ExtendingBlock
      type_name_str = decl.type_name.name.parts.join('.')

      # Find the extending block's own flat token symbol by name + line,
      # enrich it in-place with the implementation detail and methods.
      parent = name_index[type_name_str]&.find { |s| s[:kind] == 23 && symbol_line(s) == (decl.line || 0) }
      unless parent
        line = decl.line || 0
        parent = {
          name: type_name_str,
          kind: 23,
          detail: 'implementation',
          range: { start: { line: line - 1, character: 0 }, end: { line: line, character: 0 } },
          selectionRange: { start: { line: line - 1, character: 0 }, end: { line: line - 1, character: type_name_str.length } },
          children: [],
        }
        symbols << parent
        name_index[type_name_str] << parent
      end
      parent[:detail] = 'implementation'

      (decl.methods || []).each do |method|
        next unless method.respond_to?(:name) && method.name

        child = child_method_symbol(method)
        next unless child

        parent[:children] ||= []
        parent_children = parent[:children]
        parent_children << child unless parent_children.any? { |pc| pc[:name] == child[:name] }
        removed_method_names << child[:name] if child[:kind] == 6

        locals = collect_local_decls(method.respond_to?(:body) ? method.body : nil)
        next unless locals&.any?

        child[:children] ||= []
        child_children = child[:children]
        locals.each do |local|
          next unless local.name

          local_child = local_decl_symbol(local)
          next unless local_child

          child_children << local_child unless child_children.any? { |pc| pc[:name] == local_child[:name] }
          removed_local_names << local.name
          removed_local_names.concat(descendant_names(local_child))
        end
      end
    when AST::ConstDecl
      parent = name_index[decl.name]&.find { |s| symbol_line(s) == (decl.line || 0) }
      next unless parent

      if decl.respond_to?(:type) && (detail = type_detail_string(decl.type))
        parent[:detail] = detail
      end

      next unless decl.block_body

      locals = collect_local_decls(decl.block_body)
      next unless locals&.any?

      parent[:children] ||= []
      parent_children = parent[:children]
      locals.each do |local|
        next unless local.name

        child = local_decl_symbol(local)
        next unless child

        parent_children << child unless parent_children.any? { |pc| pc[:name] == child[:name] }
        removed_local_names << local.name
        removed_local_names.concat(descendant_names(child))
      end
    else
      parent_name = child_parent_name(decl)
      parent = parent_name ? name_index[parent_name]&.find { |s| symbol_line(s) == (decl.line || 0) } : nil
      next unless parent

      if decl.is_a?(AST::StructDecl) && decl.implements&.any?
        ifaces = decl.implements.map { |i|
          base = i.respond_to?(:parts) ? i.parts.join('.') : i.name.parts.join('.')
          type_args = i.respond_to?(:type_arguments) ? i.type_arguments : i.respond_to?(:arguments) ? i.arguments : []
          args = if type_args&.any?
                  arg_strs = type_args.map { |a| a.respond_to?(:name) ? a.name.parts.join('.') : a.respond_to?(:parts) ? a.parts.join('.') : a.to_s }
                  "[#{arg_strs.join(', ')}]"
                else
                  ""
                end
          "#{base}#{args}"
        }.join(', ')
        parent[:detail] = "(#{ifaces})"
      end

      type_params = expand_generic_type_params(decl)
      if type_params&.any?
        parent[:children] ||= []
        parent_children = parent[:children]
        type_params.each do |tp|
          child = type_param_child_symbol(tp)
          next unless child
          parent_children << child unless parent_children.any? { |pc| pc[:name] == child[:name] }
        end
      end

      children = child_symbols_for(decl)
      next unless children&.any?

      parent[:children] ||= []
      parent_children = parent[:children]
      children.each do |c|
        next if parent_children.any? { |pc| pc[:name] == c[:name] }

        parent_children << c
        case c[:kind]
        when 6 then removed_method_names << c[:name]
        when 23 then removed_nested_type_names << c[:name]
        when 24 then removed_event_names << c[:name]
        end
      end
    end
  end

  if removed_local_names.any?
    removed_set = removed_local_names.to_set
    symbols.reject! { |s| s[:kind] == 13 && removed_set.include?(s[:name]) }
  end
  if removed_method_names.any?
    removed_set = removed_method_names.to_set
    symbols.reject! { |s| (s[:kind] == 6 || s[:kind] == 12) && removed_set.include?(s[:name]) }
  end
  if removed_nested_type_names.any?
    removed_set = removed_nested_type_names.to_set
    symbols.reject! { |s| s[:kind] == 23 && removed_set.include?(s[:name]) && (!s[:children] || s[:children].empty?) }
  end
  if removed_event_names.any?
    removed_set = removed_event_names.to_set
    symbols.reject! { |s| s[:kind] == 24 && removed_set.include?(s[:name]) && (!s[:children] || s[:children].empty?) }
  end

  symbols
end

#expand_generic_type_params(decl) ⇒ Object 



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

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

  decl.type_params.flat_map do |tp|
    if tp.respond_to?(:type_params) && tp.type_params&.any?
      expand_generic_type_params(tp)
    else
      [tp]
    end
  end
end

#handle_document_symbols(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 9

def handle_document_symbols(params)
  stages = new_perf_stages
  total_start = stages ? monotonic_time : nil
  uri = params['textDocument']['uri']
  symbols = measure_perf_stage(stages, 'symbols') { @workspace.get_symbols(uri) }
  result = measure_perf_stage(stages, 'format') { symbols.map { |sym| format_document_symbol(sym) } }

  # Enrich with hierarchical children from AST
  ast = @workspace.get_ast(uri)
  if ast && result
    enrich_with_children(result, ast)
  end

  module_name = resolve_outline_module_name(uri)
  result = wrap_in_module_hierarchy(result, module_name, uri) if module_name && result&.any?

  result
rescue StandardError => e
  warn "Error in documentSymbol handler: #{e.message}"
  []
ensure
  symbol_count = defined?(result) && result ? result.length : 0
  log_request_stage_breakdown('textDocument/documentSymbol', total_start, uri: uri, stages: stages, summary: "symbols=#{symbol_count}")
end

#handle_formatting(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 522

def handle_formatting(params)
  uri     = params['textDocument']['uri']
  content = @workspace.get_content(uri)

  formatted = Formatter.format_source(content, path: uri, mode: @format_mode)
  line_count = content.count("\n")

  [
    {
      range: {
        start: { line: 0, character: 0 },
        end:   { line: line_count + 1, character: 0 }
      },
      newText: formatted
    }
  ]
rescue StandardError => e
  warn "Error in formatting handler: #{e.message}"
  []
end

#handle_range_formatting(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 543

def handle_range_formatting(params)
  uri = params['textDocument']['uri']
  content = @workspace.get_content(uri)
  range = params['range'] || {}
  start_pos = range['start'] || { 'line' => 0, 'character' => 0 }
  end_pos = range['end'] || { 'line' => 0, 'character' => 0 }

  start_off = @workspace.position_to_offset(uri, start_pos['line'], start_pos['character'])
  end_off = @workspace.position_to_offset(uri, end_pos['line'], end_pos['character'])
  return [] if end_off < start_off

  segment = content.byteslice(start_off...end_off).to_s
  formatted_segment = Formatter.format_source(segment, path: uri, mode: @format_mode)

  [
    {
      range: {
        start: { line: start_pos['line'], character: start_pos['character'] },
        end: { line: end_pos['line'], character: end_pos['character'] }
      },
      newText: formatted_segment
    }
  ]
rescue StandardError => e
  warn "Error in rangeFormatting handler: #{e.message}"
  []
end

#local_decl_symbol(decl) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 420

def local_decl_symbol(decl)
  return nil unless decl.name
  return nil if decl.name == '_'

  line = decl.line || 0
  col = decl.column || 1
  detail = decl.respond_to?(:type) ? type_detail_string(decl.type) : nil

  children = []
  if decl.respond_to?(:value) && decl.value.is_a?(AST::ProcExpr)
    detail ||= proc_signature_detail(decl.value)
    proc_locals = collect_local_decls(decl.value.body)
    children = proc_locals.filter_map { |l| local_decl_symbol(l) }
  end

  {
    name: decl.name, kind: 13,
    detail: detail,
    range: { start: { line: line - 1, character: col - 1 }, end: { line: line - 1, character: col - 1 + decl.name.length } },
    selectionRange: { start: { line: line - 1, character: col - 1 }, end: { line: line - 1, character: col - 1 + decl.name.length } },
    children: children.any? ? children : nil,
  }.compact
end

#proc_signature_detail(proc_expr) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 477

def proc_signature_detail(proc_expr)
  params = proc_expr.params&.map { |p| "#{p.name}: #{type_detail_string(p.type)}" }&.join(', ') || ''
  ret = type_detail_string(proc_expr.return_type) || 'void'
  "proc(#{params}) -> #{ret}"
end

#resolve_outline_module_name(uri) ⇒ Object 



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

def resolve_outline_module_name(uri)
  module_name = @workspace.module_name_for_uri(uri) || @workspace.get_facts(uri)&.module_name
  return nil unless module_name && !module_name.empty?

  segments = module_name.split('.')
  return nil if segments.length <= 1

  # Only wrap files that live under a real source root: either a
  # package.toml directory or the std/ library hierarchy.
  path = @workspace.send(:uri_to_path, uri)
  if path && !MilkTea::ModuleRoots.package_root_for_path(path) && !path.split('/').include?('std')
    return nil
  end

  module_name
end

#symbol_line(symbol) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 265

def symbol_line(symbol)
  symbol.dig(:range, :start, :line)&.+ 1 || 0
end

#type_detail_string(type) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 504

def type_detail_string(type)
  return nil unless type

  case type
  when AST::TypeRef
    type.to_s
  when AST::ProcType
    params = (type.params || []).map { |p| type_detail_string(p.type) }.join(', ')
    ret = type_detail_string(type.return_type) || 'void'
    "proc(#{params}) -> #{ret}"
  when AST::TupleType
    base = "(#{(type.element_types || []).map { |t| type_detail_string(t) }.join(', ')})"
    type.nullable ? "#{base}?" : base
  when AST::DynType
    "dyn[#{type.interface}]"
  end
end

#type_param_child_symbol(tp) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 462

def type_param_child_symbol(tp)
  return nil unless tp.respond_to?(:name) && tp.name
  return nil unless tp.line

  col = tp.column ? tp.column : 1
  {
    name: tp.name, kind: 26,
    range: { start: { line: tp.line - 1, character: col - 1 }, end: { line: tp.line - 1, character: col - 1 + tp.name.length } },
    selectionRange: {
      start: { line: tp.line - 1, character: col - 1 },
      end: { line: tp.line - 1, character: col - 1 + tp.name.length },
    },
  }
end

#wrap_in_module_hierarchy(symbols, module_name, uri) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/formatting.rb', line 51

def wrap_in_module_hierarchy(symbols, module_name, uri)
  return symbols unless module_name && !module_name.empty?

  segments = module_name.split('.')
  return symbols if segments.length <= 1

  content = @workspace.get_content(uri)
  total_lines = content ? content.count("\n") : 0
  file_range = {
    start: { line: 0, character: 0 },
    end: { line: total_lines, character: 0 },
  }

  children = symbols
  segments.reverse.each do |seg|
    children = [{
      name: seg,
      kind: 2,
      range: file_range,
      selectionRange: file_range,
      children: children,
    }]
  end
  children
end