Module: MilkTea::LSP::Server::ServerRename

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

Instance Method Summary collapse

Instance Method Details

#allow_hover_last_good_fallback?(uri) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 26

def allow_hover_last_good_fallback?(uri)
  return true unless @workspace.dependency_resolution_mode == :frozen

  path = uri_to_path(uri)
  return true unless path && File.file?(path)

  DependencyResolution.resolve(path, mode: @workspace.dependency_resolution_mode).ok?
rescue StandardError
  true
end

#ast_name_range(name, line, column) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 426

def ast_name_range(name, line, column)
  { name: name, line: line, column: column, length: name.length }
end

#collect_struct_field_changes(uri, field_name, new_name) ⇒ Object 



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

def collect_struct_field_changes(uri, field_name, new_name)
  tokens = @workspace.get_tokens(uri) || []
  edits = []
  tokens.each_with_index do |tok, i|
    next unless tok.type == :identifier && tok.lexeme == field_name
    next unless struct_field_edit_context?(tokens, i, nil)

    edits << { range: token_to_range(tok), newText: new_name }
  end
  edits.empty? ? nil : edits
end

#declaration_name_range(node) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 407

def declaration_name_range(node)
  if node.is_a?(AST::MatchArm) || node.is_a?(AST::MatchExprArm)
    return nil unless node.binding_name && node.binding_line && node.binding_column

    return {
      name: node.binding_name,
      line: node.binding_line,
      column: node.binding_column,
      length: node.binding_name.length,
    }
  end

  return nil if node.is_a?(AST::ForStmt)
  return nil unless node.respond_to?(:name)
  return nil unless node.name.is_a?(String) && node.line && node.column

  ast_name_range(node.name, node.line, node.column)
end

#definition_identity_key(location) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 161

def definition_identity_key(location)
  uri = location[:uri] || location['uri']
  range = location[:range] || location['range']
  return nil unless uri && range

  start = range[:start] || range['start']
  return nil unless start

  line = start[:line] || start['line']
  character = start[:character] || start['character']
  return nil if line.nil? || character.nil?

  [uri, line, character]
end

#each_ast_node(node) {|node| ... } ⇒ Object

Yields:

  • (node) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 430

def each_ast_node(node, &block)
  return if node.nil?

  if node.is_a?(Array)
    node.each { |item| each_ast_node(item, &block) }
    return
  end

  class_name = node.class.name
  return unless class_name && class_name.start_with?('MilkTea::AST::')

  yield node

  if node.respond_to?(:members)
    node.members.each do |member|
      next unless member.is_a?(Symbol)
      each_ast_node(node.public_send(member), &block)
    end
  end
end

#enum_member_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 251

def enum_member_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
  tokens = @workspace.get_tokens(uri) || []

  cursor_index = tokens.index { |t| t.line == token.line && t.column == token.column }
  return nil unless cursor_index

  cursor_is_enum_member = variant_enum_member_declaration?(tokens, cursor_index) ||
                          type_name_member_access?(tokens, cursor_index, facts)
  return nil unless cursor_is_enum_member

  changes = {}
  [uri, *@workspace.related_open_document_uris(uri)].uniq.each do |doc_uri|
    doc_tokens = @workspace.get_tokens(doc_uri) || []
    doc_facts = doc_uri == uri ? facts : @workspace.get_facts(doc_uri)
    edits = doc_tokens.each_with_index.filter_map do |tok, i|
      next unless tok.type == :identifier && tok.lexeme == token.lexeme

      enum_member_decl = variant_enum_member_declaration?(doc_tokens, i)
      enum_member_access = type_name_member_access?(doc_tokens, i, doc_facts)
      next unless enum_member_decl || enum_member_access

      {
        range: token_to_range(tok),
        newText: new_name,
      }
    end

    changes[doc_uri] = edits unless edits.empty?
  end

  return nil if changes.empty?
  changes
end

#find_declaration_ast_node_at(ast, name, line, char) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 393

def find_declaration_ast_node_at(ast, name, line, char)
  each_ast_node(ast) do |node|
    range = declaration_name_range(node)
    next unless range
    next unless range[:name] == name
    next unless range[:line] == line
    next unless char >= range[:column] && char < range[:column] + range[:length]

    return node
  end

  nil
end

#find_extending_type_for_method(ast, method_node) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 588

def find_extending_type_for_method(ast, method_node)
  each_ast_node(ast) do |node|
    next unless node.is_a?(AST::ExtendingBlock)
    return node.type_name if node.methods.any? { |m| m.object_id == method_node.object_id }
  end
  nil
end

#find_identifier_ast_node_at(ast, name, line, char) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 380

def find_identifier_ast_node_at(ast, name, line, char)
  each_ast_node(ast) do |node|
    next unless node.is_a?(AST::Identifier)
    next unless node.name == name
    next unless node.line == line
    next unless char >= node.column && char < node.column + name.length

    return node
  end

  nil
end

#find_method_at_position(uri, token, facts) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 571

def find_method_at_position(uri, token, facts)
  ast = @workspace.get_ast(uri)
  return nil unless ast

  each_ast_node(ast) do |node|
    next unless node.is_a?(AST::MethodDef)
    next unless node.line == token.line
    next unless token.column >= node.column && token.column < node.column + node.name.length

    type_name = find_extending_type_for_method(ast, node)
    next unless type_name

    { receiver_type: facts.types[type_name], method_name: node.name }
  end
  nil
end

#find_struct_containing_field(facts, field_name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 527

def find_struct_containing_field(facts, field_name)
  facts.types.each_value do |type|
    target = if type.is_a?(Types::GenericStructDefinition)
              type
            elsif type.is_a?(Types::Struct) || type.is_a?(Types::StructInstance)
              type.is_a?(Types::StructInstance) ? type.definition : type
            else
              next
            end
    next unless target.respond_to?(:fields) && target.fields.key?(field_name)
    return type
  end
  nil
end

#handle_prepare_rename(params) ⇒ Object 



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

def handle_prepare_rename(params)
  uri      = params['textDocument']['uri']
  lsp_line = params['position']['line']
  lsp_char = params['position']['character']

  token = @workspace.find_token_at(uri, lsp_line, lsp_char)
  return nil unless name_like_token?(token)

  { range: token_to_range(token), placeholder: token.lexeme }
rescue StandardError => e
  warn "Error in prepareRename handler: #{e.message}"
  nil
end

#handle_rename(params) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 37

def handle_rename(params)
  uri      = params['textDocument']['uri']
  lsp_line = params['position']['line']
  lsp_char = params['position']['character']
  new_name = params['newName'].to_s

  token = @workspace.find_token_at(uri, lsp_line, lsp_char)
  return nil unless name_like_token?(token)

  import_alias_changes = import_alias_rename_changes(uri, token, lsp_line, lsp_char, nil, new_name)
  return { changes: import_alias_changes } if import_alias_changes

  if (facts = @workspace.get_facts(uri))
    sc = struct_field_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
    return { changes: sc } if sc && !sc.empty?

    mc = method_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
    return { changes: mc } if mc && !mc.empty?
  end

  enum_member_changes = enum_member_rename_changes(uri, token, lsp_line, lsp_char, nil, new_name)
  return { changes: enum_member_changes } if enum_member_changes

  if (facts = @workspace.get_facts(uri))
    scoped_changes = scoped_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
    return { changes: scoped_changes } if scoped_changes

    enum_member_changes = enum_member_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
    return { changes: enum_member_changes } if enum_member_changes
  end

  workspace_symbol_changes = workspace_symbol_identity_rename_changes(uri, token, lsp_line, lsp_char, new_name)
  return { changes: workspace_symbol_changes } if workspace_symbol_changes

  lexical_changes = lexical_rename_changes_in_document(uri, token.lexeme, new_name)
  return { changes: lexical_changes } if lexical_changes

  nil
rescue StandardError => e
  warn "Error in rename handler: #{e.message}"
  nil
end

#import_alias_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name) ⇒ Object 



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

def import_alias_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
  alias_name = token.lexeme
  if facts
    return nil unless facts.imports.key?(alias_name)
  end

  ast = @workspace.get_ast(uri)
  return nil unless ast

  import_node = ast.imports.find do |imp|
    (imp.alias_name || imp.path.parts.last) == alias_name
  end
  return nil unless import_node

  # Validate the cursor is at the declaration site or a module-qualifier usage (alias followed by dot).
  tokens = @workspace.get_tokens(uri) || []

  cursor_at_declaration = token.line == import_node.line && token.column == import_node.column
  unless cursor_at_declaration
    # token was already located by find_token_at; verify it's used as a module qualifier
    tok_idx = tokens.index { |t| t.line == token.line && t.column == token.column }
    return nil unless tok_idx && tokens[tok_idx + 1]&.type == :dot
  end

  edits = []

  # Declaration site
  decl_char = import_node.column - 1
  edits << {
    range: {
      start: { line: import_node.line - 1, character: decl_char },
      end:   { line: import_node.line - 1, character: decl_char + alias_name.length },
    },
    newText: new_name,
  }

  # Usage sites: every token with this lexeme immediately followed by a dot
  tokens.each_with_index do |tok, i|
    next unless tok.type == :identifier && tok.lexeme == alias_name
    next unless tokens[i + 1]&.type == :dot

    edits << {
      range: {
        start: { line: tok.line - 1, character: tok.column - 1 },
        end:   { line: tok.line - 1, character: tok.column - 1 + alias_name.length },
      },
      newText: new_name,
    }
  end

  { uri => edits }
end

#lexical_rename_changes_in_document(uri, name, new_name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 80

def lexical_rename_changes_in_document(uri, name, new_name)
  tokens = @workspace.get_tokens(uri) || []
  edits = tokens.flat_map do |tok|
    result = []

    if tok.type == :fstring && tok.literal.is_a?(Array)
      tok.literal.each do |part|
        next unless part.is_a?(Hash) && part[:kind] == :expr
        next unless part[:line] && part[:column]

        expr_tokens = MilkTea::Lexer.lex(part[:source], path: uri_to_path(uri))
        expr_tokens.each do |etok|
          next unless name_like_token?(etok) && etok.lexeme == name

          result << {
            range: {
              start: { line: part[:line] - 1, character: part[:column] + etok.column - 2 },
              end:   { line: part[:line] - 1, character: part[:column] + etok.column - 2 + etok.lexeme.length },
            },
            newText: new_name,
          }
        end
      rescue MilkTea::LexError
        nil
      end
    end

    if name_like_token?(tok) && tok.lexeme == name
      result << { range: token_to_range(tok), newText: new_name }
    end

    result
  end

  return nil if edits.empty?

  { uri => edits }
end

#local_binding_declaration_node?(node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 319

def local_binding_declaration_node?(node)
  node.is_a?(AST::LocalDecl) ||
    node.is_a?(AST::Param) ||
    node.is_a?(AST::ForBinding) ||
    node.is_a?(AST::MatchArm) ||
    node.is_a?(AST::MatchExprArm)
end

#local_binding_id?(uri, facts, binding_id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 302

def local_binding_id?(uri, facts, binding_id)
  ast = @workspace.get_ast(uri)
  return false unless ast

  resolution = facts.binding_resolution
  return false unless resolution

  each_ast_node(ast) do |node|
    next unless local_binding_declaration_node?(node)
    next unless resolution.declaration_binding_ids[node.object_id] == binding_id

    return true
  end

  false
end

#method_rename_changes(uri, token, _lsp_line, _lsp_char, facts, new_name) ⇒ Object 



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

def method_rename_changes(uri, token, _lsp_line, _lsp_char, facts, new_name)
  method_name = token.lexeme
  method_info = find_method_at_position(uri, token, facts)
  return nil unless method_info

  receiver_type = method_info[:receiver_type]
  return nil unless receiver_type

  changes = {}
  [uri, *@workspace.related_open_document_uris(uri)].uniq.each do |doc_uri|
    edits = []
    doc_tokens = @workspace.get_tokens(doc_uri) || []
    doc_tokens.each_with_index do |tok, i|
      next unless tok.type == :identifier && tok.lexeme == method_name

      is_call = i > 0 && doc_tokens[i - 1].type == :dot
      is_def = doc_uri == uri && tok.line == token.line && tok.column == token.column
      next unless is_call || is_def

      edits << { range: token_to_range(tok), newText: new_name }
    end

    changes[doc_uri] = edits unless edits.empty?
  end

  return nil if changes.empty?
  changes
end

#name_like_token?(tok) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 21

def name_like_token?(tok)
  return false if tok.nil?
  tok.type == :identifier || Token::KEYWORDS.value?(tok.type)
end

#rename_target_binding_id(uri, token, lsp_line, lsp_char, facts) ⇒ Object 



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

def rename_target_binding_id(uri, token, lsp_line, lsp_char, facts)
  resolution = facts.binding_resolution
  return nil unless resolution

  line = lsp_line + 1
  char = lsp_char + 1
  ast = @workspace.get_ast(uri)
  return nil unless ast

  identifier_node = find_identifier_ast_node_at(ast, token.lexeme, line, char)
  if identifier_node && (id = resolution.identifier_binding_ids[identifier_node.object_id])
    return id
  end

  declaration_node = find_declaration_ast_node_at(ast, token.lexeme, line, char)
  if declaration_node && (id = resolution.declaration_binding_ids[declaration_node.object_id])
    return id
  end

  resolve_local_hover_binding(facts, token.lexeme, line, char)&.id
end

#scoped_binding_occurrence_ranges(uri, name, facts, binding_id, include_declaration:) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 349

def scoped_binding_occurrence_ranges(uri, name, facts, binding_id, include_declaration:)
  ast = @workspace.get_ast(uri)
  return [] unless ast

  resolution = facts.binding_resolution
  return [] unless resolution

  ranges = []
  seen = Set.new

  each_ast_node(ast) do |node|
    range = nil

    if node.is_a?(AST::Identifier) && node.name == name && resolution.identifier_binding_ids[node.object_id] == binding_id
      range = ast_name_range(node.name, node.line, node.column)
    elsif include_declaration && resolution.declaration_binding_ids[node.object_id] == binding_id
      range = declaration_name_range(node)
    end

    next unless range

    key = [range[:line], range[:column], range[:length]]
    next if seen.include?(key)

    seen << key
    ranges << range
  end

  ranges
end

#scoped_local_reference_locations(uri, token, lsp_line, lsp_char, facts, include_declaration:) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 285

def scoped_local_reference_locations(uri, token, lsp_line, lsp_char, facts, include_declaration:)
  binding_id = rename_target_binding_id(uri, token, lsp_line, lsp_char, facts)
  return nil unless binding_id
  return nil unless local_binding_id?(uri, facts, binding_id)

  ranges = scoped_binding_occurrence_ranges(uri, token.lexeme, facts, binding_id, include_declaration: include_declaration)
  ranges.map do |range|
    {
      uri: uri,
      range: {
        start: { line: range[:line] - 1, character: range[:column] - 1 },
        end: { line: range[:line] - 1, character: range[:column] - 1 + range[:length] },
      },
    }
  end
end

#scoped_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 176

def scoped_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
  binding_id = rename_target_binding_id(uri, token, lsp_line, lsp_char, facts)
  unless binding_id
    return import_alias_rename_changes(uri, token, lsp_line, lsp_char, facts, new_name)
  end

  ranges = scoped_binding_occurrence_ranges(uri, token.lexeme, facts, binding_id, include_declaration: true)
  return nil if ranges.empty?

  edits = ranges.map do |range|
    {
      range: {
        start: { line: range[:line] - 1, character: range[:column] - 1 },
        end: { line: range[:line] - 1, character: range[:column] - 1 + range[:length] },
      },
      newText: new_name,
    }
  end

  { uri => edits }
end

#skip_trivia_forward(tokens, start_index) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 518

def skip_trivia_forward(tokens, start_index)
  i = start_index
  while i < tokens.length
    return i unless tokens[i].type == :whitespace || tokens[i].type == :newline || tokens[i].type == :comment
    i += 1
  end
  nil
end

#struct_field_cursor_context?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/lsp/server/rename.rb', line 489

def struct_field_cursor_context?(tokens, index)
  next_nt = skip_trivia_forward(tokens, index + 1)
  return true if next_nt && tokens[next_nt]&.type == :colon

  return true if index > 0 && tokens[index - 1].type == :dot

  if index > 0 && (tokens[index - 1].type == :lparen || tokens[index - 1].type == :comma)
    next_nt = skip_trivia_forward(tokens, index + 1)
    return true if next_nt && (tokens[next_nt]&.type == :equal || tokens[next_nt]&.type == :colon)
    return true if next_nt.nil? || !(tokens[next_nt]&.type == :equal || tokens[next_nt]&.type == :colon)
  end

  false
end

#struct_field_edit_context?(tokens, index, _struct_type) ⇒ Boolean

Returns:

  • (Boolean) 


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

def struct_field_edit_context?(tokens, index, _struct_type)
  return true if index > 0 && tokens[index - 1].type == :dot

  next_nt = skip_trivia_forward(tokens, index + 1)
  return true if next_nt && tokens[next_nt]&.type == :colon

  if index > 0 && (tokens[index - 1].type == :lparen || tokens[index - 1].type == :comma)
    next_nt = skip_trivia_forward(tokens, index + 1)
    return true if next_nt.nil? || (tokens[next_nt]&.type == :equal || tokens[next_nt]&.type == :colon) || tokens[next_nt]&.type == :comma || tokens[next_nt]&.type == :rparen
  end

  false
end

#struct_field_rename_changes(uri, token, _lsp_line, _lsp_char, facts, new_name) ⇒ Object 



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# File 'lib/milk_tea/lsp/server/rename.rb', line 451

def struct_field_rename_changes(uri, token, _lsp_line, _lsp_char, facts, new_name)
  field_name = token.lexeme
  tokens = @workspace.get_tokens(uri) || []
  idx = tokens.index { |t| t.line == token.line && t.column == token.column }
  return nil unless idx

  cursor_in_field_context = struct_field_cursor_context?(tokens, idx)
  return nil unless cursor_in_field_context

  struct_type = find_struct_containing_field(facts, field_name)
  return nil unless struct_type

  changes = {}
  edits = collect_struct_field_changes(uri, field_name, new_name)
  changes[uri] = edits if edits
  related_uris = @workspace.related_open_document_uris(uri)
  related_uris.each do |related_uri|
    next if related_uri == uri
    related_changes = collect_struct_field_changes(related_uri, field_name, new_name)
    changes[related_uri] = related_changes if related_changes
  end

  return nil if changes.empty?
  changes
end

#workspace_symbol_identity_rename_changes(uri, token, lsp_line, lsp_char, new_name) ⇒ Object 



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

def workspace_symbol_identity_rename_changes(uri, token, lsp_line, lsp_char, new_name)
  target_location = resolve_definition_location({
    'textDocument' => { 'uri' => uri },
    'position' => { 'line' => lsp_line, 'character' => lsp_char },
  }, stages: nil)
  return nil unless target_location

  target_identity = definition_identity_key(target_location)
  return nil unless target_identity

  related_uris = @workspace.related_open_document_uris(uri)
  return nil if related_uris.empty?

  changes = {}
  related_uris.each do |related_uri|
    tokens = @workspace.get_tokens(related_uri) || []
    next if tokens.empty?

    edits = tokens.filter_map do |candidate|
      next unless name_like_token?(candidate) && candidate.lexeme == token.lexeme

      candidate_location = resolve_definition_location({
        'textDocument' => { 'uri' => related_uri },
        'position' => { 'line' => candidate.line - 1, 'character' => candidate.column - 1 },
      }, stages: nil)
      next unless candidate_location
      next unless definition_identity_key(candidate_location) == target_identity

      {
        range: token_to_range(candidate),
        newText: new_name,
      }
    end

    changes[related_uri] = edits unless edits.empty?
  end

  return nil if changes.empty?

  changes
end