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 13

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
          repl = '_'
        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 ⇒ Object (readonly)

Returns the value of attribute code.



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# File 'lib/solargraph/code_map.rb', line 6

def code
  @code
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/solargraph/code_map.rb', line 8

def filename
  @filename
end

#node ⇒ Object

Returns the value of attribute node.



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# File 'lib/solargraph/code_map.rb', line 5

def node
  @node
end

#parsed ⇒ Object (readonly)

Returns the value of attribute parsed.



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# File 'lib/solargraph/code_map.rb', line 7

def parsed
  @parsed
end

#workspace ⇒ Object (readonly)

Returns the value of attribute workspace.



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

def workspace
  @workspace
end

Class Method Details

.get_offset(text, line, col) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 89

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 73

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

#build_signature(node, parts) ⇒ Array<String>

Build a signature from the specified node. This method returns the node as an array of strings.

Returns:

  • (Array<String>) 


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# File 'lib/solargraph/code_map.rb', line 509

def build_signature(node, parts)
  if node.kind_of?(AST::Node)
    if node.type == :send
      parts.unshift node.children[1].to_s
    elsif node.type == :const
      parts.unshift unpack_name(node)
    end
    build_signature(node.children[0], parts)
  end
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 130

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 222

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 227

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 544

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, 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 85

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:

Code                  Signature
-----------------------------------------
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 470

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
    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
end

#get_snippets_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 520

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 448

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 346

def infer_signature_at index
  signature = get_signature_at(index)
  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], :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
  result
end

#infer_signature_from_node(signature, node) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 391

def infer_signature_from_node signature, node
  inferred = nil
  parts = signature.split('.')
  ns_here = namespace_from(node)
  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: :instance)
    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 382

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 158

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 177

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 115

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 143

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 191

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 299

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?
  return api_map.yard_map.objects(path, ns_here)
end

#signatures_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 292

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 122

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 237

def suggest_at index, filtered: false, with_snippets: false
  return [] if string_at?(index) or string_at?(index - 1) or comment_at?(index)
  result = []
  phrase = phrase_at(index)
  signature = get_signature_at(index)
  namespace = namespace_at(index)
  if signature.include?('.')
    # Check for literals first

    type = infer_literal_node_type(node_at(index - 2))
    if type.nil?
      nearest = @code[0, index].rindex('.')
      revised = signature[0..nearest-index-1]
      type = infer_signature_at(nearest) unless revised.empty?
      if !type.nil?
        result.concat api_map.get_instance_methods(type) unless type.nil?
      elsif !revised.include?('.')
        fqns = api_map.find_fully_qualified_namespace(revised, namespace)
        result.concat api_map.get_methods(fqns) unless fqns.nil?
      end
    else
      result.concat api_map.get_instance_methods(type)
    end
  elsif signature.start_with?('@@')
    result.concat get_class_variables_at(index)
  elsif signature.start_with?('@')
    result.concat get_instance_variables_at(index)
  elsif phrase.start_with?('$')
    result.concat api_map.get_global_variables
  elsif 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
    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')
  end
  result = reduce_starting_with(result, word_at(index)) if filtered
  result.uniq{|s| s.path}.sort{|a,b| a.label <=> b.label}
end

#suggest_for_signature_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 441

def suggest_for_signature_at index
  result = []
  type = infer_signature_at(index)
  result.concat api_map.get_instance_methods(type) unless type.nil?
  result
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 104

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 209

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