Class: Solargraph::CodeMap

Inherits:
Object
  • Object
show all
Includes:
NodeMethods
Defined in:
lib/solargraph/code_map.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from NodeMethods

#const_from, #infer_literal_node_type, #pack_name, #resolve_node_signature, #unpack_name

Constructor Details

#initialize(code: '', filename: nil, workspace: nil, api_map: nil, cursor: nil) ⇒ CodeMap

Returns a new instance of CodeMap.



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# File 'lib/solargraph/code_map.rb', line 35

def initialize code: '', filename: nil, workspace: nil, api_map: nil, cursor: nil
  @workspace = workspace
  # HACK: Adjust incoming filename's path separator for yardoc file comparisons
  filename = filename.gsub(File::ALT_SEPARATOR, File::SEPARATOR) unless filename.nil? or File::ALT_SEPARATOR.nil?
  @filename = filename
  @api_map = api_map
  @code = code.gsub(/\r/, '')
  tries = 0
  tmp = @code
  cursor = CodeMap.get_offset(@code, cursor[0], cursor[1]) if cursor.kind_of?(Array)
  fixed_cursor = false
  begin
    # HACK: The current file is parsed with a trailing underscore to fix
    # incomplete trees resulting from short scripts (e.g., a lone variable
    # assignment).
    node, @comments = Parser::CurrentRuby.parse_with_comments(tmp + "\n_")
    @node = self.api_map.append_node(node, @comments, filename)
    @parsed = tmp
    @code.freeze
    @parsed.freeze
  rescue Parser::SyntaxError => e
    if tries < 10
      tries += 1
      if tries == 10 and e.message.include?('token $end')
        tmp += "\nend"
      else
        if !fixed_cursor and !cursor.nil? and e.message.include?('token $end') and cursor >= 2
          fixed_cursor = true
          spot = cursor - 2
          if tmp[cursor - 1] == '.'
            repl = ';'
          else
            repl = '#'
          end
        else
          spot = e.diagnostic.location.begin_pos
          repl = '_'
          if tmp[spot] == '@' or tmp[spot] == ':'
            # Stub unfinished instance variables and symbols
            spot -= 1
          elsif tmp[spot - 1] == '.'
            # Stub unfinished method calls
            repl = '#' if spot == tmp.length or tmp[spot] == '\n'
            spot -= 2
          else
            # Stub the whole line
            spot = beginning_of_line_from(tmp, spot)
            repl = '#'
            if tmp[spot+1..-1].rstrip == 'end'
              repl= 'end;end'
            end
          end
        end
        tmp = tmp[0..spot] + repl + tmp[spot+repl.length+1..-1].to_s
      end
      retry
    end
    raise e
  end
end

Instance Attribute Details

#code ⇒ String (readonly)

The source code being analyzed.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 14

def code
  @code
end

#filename ⇒ String (readonly)

The filename for the source code.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 25

def filename
  @filename
end

#node ⇒ AST::Node

The root node of the parsed code.

Returns:

  • (AST::Node) 


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# File 'lib/solargraph/code_map.rb', line 9

def node
  @node
end

#parsed ⇒ String (readonly)

The source code after modification to fix syntax errors during parsing. This string will match #code if no modifications were made.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 20

def parsed
  @parsed
end

#workspace ⇒ String (readonly)

The root directory of the project. The ApiMap will search here for additional files to parse and analyze.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 31

def workspace
  @workspace
end

Class Method Details

.get_offset(text, line, col) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 115

def self.get_offset text, line, col
  offset = 0
  if line > 0
    text.lines[0..line - 1].each { |l|
      offset += l.length
    }
  end
  offset + col      
end

Instance Method Details

#api_map ⇒ Solargraph::ApiMap

Get the ApiMap that was generated for this CodeMap.

Returns:



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# File 'lib/solargraph/code_map.rb', line 99

def api_map
  @api_map ||= ApiMap.new(workspace)
end

#comment_at?(index) ⇒ Boolean

Determine if the specified index is inside a comment.

Returns:

  • (Boolean) 


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# File 'lib/solargraph/code_map.rb', line 156

def comment_at?(index)
  @comments.each do |c|
    return true if index > c.location.expression.begin_pos and index <= c.location.expression.end_pos
  end
  false
end

#get_class_variables_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 248

def get_class_variables_at(index)
  ns = namespace_at(index) || ''
  api_map.get_class_variables(ns)
end

#get_instance_variables_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 253

def get_instance_variables_at(index)
  node = parent_node_from(index, :def, :defs, :class, :module)
  ns = namespace_at(index) || ''
  api_map.get_instance_variables(ns, (node.type == :def ? :instance : :class))
end

#get_local_variables_and_methods_at(index) ⇒ Array<Solargraph::Suggestion>

Get an array of local variables and methods that can be accessed from the specified location in the code.

Parameters:

  • index (Integer)

Returns:



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# File 'lib/solargraph/code_map.rb', line 637

def get_local_variables_and_methods_at(index)
  result = []
  local = parent_node_from(index, :class, :module, :def, :defs) || @node
  result += get_local_variables_from(local)
  scope = namespace_at(index) || @node
  if local.type == :def
    result += api_map.get_instance_methods(scope, visibility: [:public, :private, :protected])
  else
    result += api_map.get_methods(scope, scope, visibility: [:public, :private, :protected])
  end
  if local.type == :def or local.type == :defs
    result += get_method_arguments_from local
  end
  result += get_yieldparams_at(index)
  result += api_map.get_methods('Kernel')
  result
end

#get_offset(line, col) ⇒ Integer

Get the offset of the specified line and column. The offset (also called the “index”) is typically used to identify the cursor’s location in the code when generating suggestions. The line and column numbers should start at zero.

Parameters:

  • line (Integer)
  • col (Integer)

Returns:

  • (Integer) 


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# File 'lib/solargraph/code_map.rb', line 111

def get_offset line, col
  CodeMap.get_offset @code, line, col
end

#get_signature_at(index) ⇒ String

Get the signature at the specified index. A signature is a method call that can start with a constant, method, or variable and does not include any method arguments. Examples:

  • String.new -> String.new

  • @x.bar -> @x.bar

  • y.split(‘, ’).length -> y.split.length

Parameters:

  • index (Integer)

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 537

def get_signature_at index
  brackets = 0
  squares = 0
  parens = 0
  signature = ''
  index -=1
  while index >= 0
    break if brackets > 0 or parens > 0 or squares > 0
    char = @code[index, 1]
    if char == ')'
      parens -=1
    elsif char == ']'
      squares -=1
    elsif char == '}'
      brackets -= 1
    elsif char == '('
      parens += 1
    elsif char == '{'
      brackets += 1
    elsif char == '['
      squares += 1
      signature = ".[]#{signature}" if squares == 0 and @code[index-2] != '%'
    end
    if brackets == 0 and parens == 0 and squares == 0
      break if ['"', "'", ',', ' ', "\t", "\n", ';', '%'].include?(char)
      signature = char + signature if char.match(/[a-z0-9:\._@]/i) and @code[index - 1] != '%'
      if char == '@'
        signature = "@#{signature}" if @code[index-1, 1] == '@'
        break
      end
    end
    index -= 1
  end
  signature = signature[1..-1] if signature.start_with?('.')
  #signature = signature[2..-1] if signature.start_with?('[]')
  signature
end

#get_signature_index_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 575

def get_signature_index_at index
  brackets = 0
  squares = 0
  parens = 0
  signature = ''
  index -=1
  while index >= 0
    break if brackets > 0 or parens > 0 or squares > 0
    char = @code[index, 1]
    if char == ')'
      parens -=1
    elsif char == ']'
      squares -=1
    elsif char == '}'
      brackets -= 1
    elsif char == '('
      parens += 1
    elsif char == '{'
      brackets += 1
    elsif char == '['
      squares += 1
      signature = ".[]#{signature}" if squares == 0
    end
    if brackets == 0 and parens == 0 and squares == 0
      break if ['"', "'", ',', ' ', "\t", "\n", ';'].include?(char)
      signature = char + signature if char.match(/[a-z0-9:\._@]/i)
      if char == '@'
        signature = "@#{signature}" if @code[index-1, 1] == '@'
        break
      end
    end
    index -= 1
  end
  signature = signature[1..-1] if signature.start_with?('.')
  signature = signature[2..-1] if signature.start_with?('[]')
  index + 1
end

#get_snippets_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 613

def get_snippets_at(index)
  result = []
  Snippets.definitions.each_pair { |name, detail|
    matched = false
    prefix = detail['prefix']
    while prefix.length > 0
      if @code[index-prefix.length, prefix.length] == prefix
        matched = true
        break
      end
      prefix = prefix[0..-2]
    end
    if matched
      result.push Suggestion.new(detail['prefix'], kind: Suggestion::SNIPPET, detail: name, insert: detail['body'].join("\r\n"))
    end
  }
  result
end

#get_type_comment(node) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 517

def get_type_comment node
  obj = nil
  cmnt = api_map.get_comment_for(node)
  unless cmnt.nil?
    tag = cmnt.tag(:type)
    obj = tag.types[0] unless tag.nil? or tag.types.empty?
  end
  obj
end

#infer_signature_at(index) ⇒ String

Infer the type of the signature located at the specified index.

Examples:

# Given the following code:
nums = [1, 2, 3]
nums.join
# ...and given an index that points at the end of "nums.join",
# infer_signature_at will identify nums as an Array and the return
# type of Array#join as a String, so the signature's type will be
# String.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 387

def infer_signature_at index
  signature = get_signature_at(index)
  # Check for literals first
  return 'Integer' if signature.match(/^[0-9]+?\.?$/)
  literal = nil
  if (signature.empty? and @code[index - 1] == '.') or signature == '[].'
    literal = node_at(index - 2)
  elsif signature.start_with?('.')
    literal = node_at(index - 1)
  else
    beg_sig = get_signature_index_at(index)
    literal = node_at(1 + beg_sig)
  end
  type = infer_literal_node_type(literal)
  if type.nil?
    node = parent_node_from(index, :class, :module, :def, :defs) || @node
    result = infer_signature_from_node signature, node
    if result.nil? or result.empty?
      arg = nil
      if node.type == :def or node.type == :defs or node.type == :block
        # Check for method arguments
        parts = signature.split('.', 2)
        # @type [Solargraph::Suggestion]
        arg = get_method_arguments_from(node).keep_if{|s| s.to_s == parts[0] }.first
        unless arg.nil?
          if parts[1].nil?
            result = arg.return_type
          else
            result = api_map.infer_signature_type(parts[1], parts[0], scope: :instance)
          end
        end
      end
      if arg.nil?
        # Check for yieldparams
        parts = signature.split('.', 2)
        yp = get_yieldparams_at(index).keep_if{|s| s.to_s == parts[0]}.first
        unless yp.nil?
          if parts[1].nil? or parts[1].empty?
            result = yp.return_type
          else
            newsig = parts[1..-1].join('.')
            result = api_map.infer_signature_type(newsig, yp.return_type, scope: :instance)
          end
        end
      end
    end
  else
    if signature.empty?
      result = type
    else
      cursed = get_signature_index_at(index)
      rest = signature[literal.loc.expression.end_pos+(cursed-literal.loc.expression.end_pos)..-1]
      return type if rest.nil?
      lit_code = @code[literal.loc.expression.begin_pos..literal.loc.expression.end_pos]
      rest = rest[lit_code.length..-1] if rest.start_with?(lit_code)
      rest = rest[1..-1] if rest.start_with?('.')
      rest = rest[0..-2] if rest.end_with?('.')
      if rest.empty?
        result = type
      else
        result = api_map.infer_signature_type(rest, type, scope: :instance)
      end
    end
  end
  result
end

#infer_signature_from_node(signature, node) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 463

def infer_signature_from_node signature, node
  inferred = nil
  parts = signature.split('.')
  ns_here = namespace_from(node)
  unless signature.include?('.')
    fqns = api_map.find_fully_qualified_namespace(signature, ns_here)
    return "Class<#{fqns}>" unless fqns.nil?
  end
  start = parts[0]
  return nil if start.nil?
  remainder = parts[1..-1]
  if start.start_with?('@@')
    type = api_map.infer_class_variable(start, ns_here)
    return nil if type.nil?
    return type if remainder.empty?
    return api_map.infer_signature_type(remainder.join('.'), type, scope: :instance)
  elsif start.start_with?('@')
    scope = (node.type == :def ? :instance : :scope)
    type = api_map.infer_instance_variable(start, ns_here, scope)
    return nil if type.nil?
    return type if remainder.empty?
    return api_map.infer_signature_type(remainder.join('.'), type, scope: :instance)
  end
  var = find_local_variable_node(start, node)
  if var.nil?
    scope = (node.type == :def ? :instance : :class)
    type = api_map.infer_signature_type(signature, ns_here, scope: scope)
    return type unless type.nil?
  else
    # Signature starts with a local variable
    type = get_type_comment(var)
    type = infer_literal_node_type(var.children[1]) if type.nil?
    if type.nil?
      vsig = resolve_node_signature(var.children[1])
      type = infer_signature_from_node vsig, node
    end
  end
  unless type.nil?
    if remainder[0] == 'new'
      remainder.shift
      if remainder.empty?
        inferred = type
      else
        inferred = api_map.infer_signature_type(remainder.join('.'), type, scope: :instance)
      end
    elsif remainder.empty?
      inferred = type
    else
      inferred = api_map.infer_signature_type(remainder.join('.'), type, scope: :instance)
    end
  end
  inferred
end

#local_variable_in_node?(name, node) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/solargraph/code_map.rb', line 454

def local_variable_in_node?(name, node)
  return true unless find_local_variable_node(name, node).nil?
  if node.type == :def or node.type == :defs
    args = get_method_arguments_from(node).keep_if{|a| a.label == name}
    return true unless args.empty?
  end
  false
end

#namespace_at(index) ⇒ String

Get the namespace at the specified location. For example, given the code ‘class Foo; def bar; end; end`, index 14 (the center) is in the “Foo” namespace.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 184

def namespace_at(index)
  tree = tree_at(index)
  return nil if tree.length == 0
  slice = tree
  parts = []
  slice.reverse.each { |n|
    if n.type == :class or n.type == :module
      c = const_from(n.children[0])
      parts.push c
    end
  }
  parts.join("::")
end

#namespace_from(node) ⇒ String

Get the namespace for the specified node. For example, given the code ‘class Foo; def bar; end; end`, the node for `def bar` is in the “Foo” namespace.

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 203

def namespace_from(node)
  if node.respond_to?(:loc)
    namespace_at(node.loc.expression.begin_pos)
  else
    ''
  end
end

#node_at(index) ⇒ AST::Node

Get the nearest node that contains the specified index.

Parameters:

  • index (Integer)

Returns:

  • (AST::Node) 


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# File 'lib/solargraph/code_map.rb', line 141

def node_at(index)
  tree_at(index).first
end

#parent_node_from(index, *types) ⇒ AST::Node

Find the nearest parent node from the specified index. If one or more types are provided, find the nearest node whose type is in the list.

Parameters:

  • index (Integer)
  • types (Array<Symbol>)

Returns:

  • (AST::Node) 


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# File 'lib/solargraph/code_map.rb', line 169

def parent_node_from(index, *types)
  arr = tree_at(index)
  arr.each { |a|
    if a.kind_of?(AST::Node) and (types.empty? or types.include?(a.type))
      return a
    end
  }
  @node
end

#phrase_at(index) ⇒ String

Select the phrase that directly precedes the specified index. A phrase can consist of most types of characters other than whitespace, semi-colons, equal signs, parentheses, or brackets.

Parameters:

  • index (Integer)

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 217

def phrase_at index
  word = ''
  cursor = index - 1
  while cursor > -1
    char = @code[cursor, 1]
    break if char.nil? or char == ''
    break unless char.match(/[\s;=\(\)\[\]\{\}]/).nil?
    word = char + word
    cursor -= 1
  end
  word
end

#resolve_object_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 337

def resolve_object_at index
  return [] if string_at?(index)
  signature = get_signature_at(index)
  cursor = index
  while @code[cursor] =~ /[a-z0-9_\?]/i
    signature += @code[cursor]
    cursor += 1
    break if cursor >= @code.length
  end
  return [] if signature.to_s == ''
  path = nil
  ns_here = namespace_at(index)
  node = parent_node_from(index, :class, :module, :def, :defs) || @node
  parts = signature.split('.')
  if parts.length > 1
    beginner = parts[0..-2].join('.')
    type = infer_signature_from_node(beginner, node)
    ender = parts.last
    path = "#{type}##{ender}"
  else
    if local_variable_in_node?(signature, node)
      path = infer_signature_from_node(signature, node)
    elsif signature.start_with?('@')
      path = api_map.infer_instance_variable(signature, ns_here, (node.type == :def ? :instance : :class))
    else
      path = signature
    end
    if path.nil?
      path = api_map.find_fully_qualified_namespace(signature, ns_here)
    end
  end
  return [] if path.nil?
  if path.start_with?('Class<')
    path.gsub!(/^Class<([a-z0-9_:]*)>#([a-z0-9_]*)$/i, '\\1.\\2')
  end
  api_map.yard_map.objects(path, ns_here)
end

#signatures_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 330

def signatures_at index
  sig = signature_index_before(index)
  return [] if sig.nil?
  word = word_at(sig)
  suggest_at(sig).reject{|s| s.label != word}
end

#string_at?(index) ⇒ Boolean

Determine if the specified index is inside a string.

Returns:

  • (Boolean) 


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# File 'lib/solargraph/code_map.rb', line 148

def string_at?(index)
  n = node_at(index)
  n.kind_of?(AST::Node) and n.type == :str
end

#suggest_at(index, filtered: false, with_snippets: false) ⇒ Array<Suggestions>

Get suggestions for code completion at the specified location in the source.

Returns:

  • (Array<Suggestions>) —

    The completion suggestions



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# File 'lib/solargraph/code_map.rb', line 263

def suggest_at index, filtered: false, with_snippets: false
  return [] if string_at?(index) or string_at?(index - 1) or comment_at?(index)
  result = []
  signature = get_signature_at(index)
  if index == 0 or @code[index - 1].match(/[\.\s]/)
    type = infer_signature_at(index)
  else
    if signature.include?('.')
      last_period = @code[0..index].rindex('.')
      if last_period.nil?
        type = infer_signature_at(index)
      else
        type = infer_signature_at(last_period)
      end  
    else
      if signature.start_with?('@@')
        return get_class_variables_at(index)
      elsif signature.start_with?('@')
        return get_instance_variables_at(index)
      elsif signature.start_with?('$')
        return api_map.get_global_variables
      else
        type = infer_signature_at(index)
      end
    end
  end
  if type.nil?
    unless signature.include?('.')
      phrase = phrase_at(index)
      signature = get_signature_at(index)
      namespace = namespace_at(index)
      if phrase.include?('::')
        parts = phrase.split('::', -1)
        ns = parts[0..-2].join('::')
        if parts.last.include?('.')
          ns = parts[0..-2].join('::') + '::' + parts.last[0..parts.last.index('.')-1]
          result = api_map.get_methods(ns)
        else
          result = api_map.namespaces_in(ns, namespace)
        end
      else
        type = infer_literal_node_type(node_at(index - 2))
        if type.nil?
          current_namespace = namespace_at(index)
          parts = current_namespace.to_s.split('::')
          result += get_snippets_at(index) if with_snippets
          result += get_local_variables_and_methods_at(index)
          result += ApiMap.get_keywords
          while parts.length > 0
            ns = parts.join('::')
            result += api_map.namespaces_in(ns, namespace)
            parts.pop
          end
          result += api_map.namespaces_in('')
          result += api_map.get_instance_methods('Kernel')
        else
          result.concat api_map.get_instance_methods(type)
        end
      end
    end
  else
    result.concat api_map.get_instance_methods(type)
  end
  result = reduce_starting_with(result, word_at(index)) if filtered
  result.uniq{|s| s.path}.sort{|a,b| a.label <=> b.label}
end

#tree_at(index) ⇒ Array<AST::Node>

Get an array of nodes containing the specified index, starting with the topmost node and ending with the nearest.

Parameters:

  • index (Integer)

Returns:

  • (Array<AST::Node>) 


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# File 'lib/solargraph/code_map.rb', line 130

def tree_at(index)
  arr = []
  arr.push @node
  inner_node_at(index, @node, arr)
  arr
end

#word_at(index) ⇒ String

Select the word that directly precedes the specified index. A word can only consist of letters, numbers, and underscores.

Parameters:

  • index (Integer)

Returns:

  • (String) 


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# File 'lib/solargraph/code_map.rb', line 235

def word_at index
  word = ''
  cursor = index - 1
  while cursor > -1
    char = @code[cursor, 1]
    break if char.nil? or char == ''
    break unless char.match(/[a-z0-9_]/i)
    word = char + word
    cursor -= 1
  end
  word
end