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 29

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
  @source = self.api_map.virtualize filename, code, cursor
  @node = @source.node
  @code = @source.code
  @comments = @source.comments
  self.api_map.refresh
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 19

def filename
  @filename
end

#node ⇒ Parser::AST::Node (readonly)

The root node of the parsed code.

Returns:

  • (Parser::AST::Node) 


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

def node
  @node
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 25

def workspace
  @workspace
end

Class Method Details

.get_offset(text, line, col) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 61

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 associated ApiMap.

Returns:



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# File 'lib/solargraph/code_map.rb', line 45

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 102

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) ⇒ Array<Solargraph::Suggestion>

Returns:



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# File 'lib/solargraph/code_map.rb', line 177

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 182

def get_instance_variables_at(index)
  # @todo There are a lot of other cases that need to be handled here
  node = parent_node_from(index, :def, :defs, :class, :module, :sclass)
  ns = namespace_at(index) || ''
  scope = (node.type == :def ? :instance : :class)
  api_map.get_instance_variables(ns, scope)
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 507

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)
  result += get_local_variables_from(node_at(index))
  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)
  # @todo This might not be necessary.
  #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 57

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 475

def get_signature_at index
  get_signature_data_at(index)[1]
end

#get_signature_index_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 479

def get_signature_index_at index
  get_signature_data_at(index)[0]
end

#get_snippets_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 483

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 455

def get_type_comment node
  obj = nil
  cmnt = @source.docstring_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 309

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)
    if @code[beg_sig] == '.'
      literal = node_at(beg_sig - 1)
    else
      literal = node_at(1 + beg_sig)
    end
  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?
      # The rest of this routine is dedicated to method and block parameters
      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], arg.return_type, 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? or signature == '[].'
      result = type
    else
      cursed = get_signature_index_at(index)
      if signature.start_with?('[].')
        rest = signature[3..-1]
      else
        if signature.start_with?('.')
          rest = signature[literal.loc.expression.end_pos+(cursed-literal.loc.expression.end_pos)..-1]
        else
          rest = signature
        end
      end
      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 398

def infer_signature_from_node signature, node
  inferred = nil
  parts = signature.split('.')
  ns_here = namespace_from(node)
  if parts[0] and parts[0].include?('::')
    sub = get_namespace_or_constant(parts[0], ns_here)
    unless sub.nil?
      return sub if signature.match(/^#{parts[0]}\.$/)
      parts[0] = sub
    end
  end
  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?('@@')
    cv = api_map.get_class_variable_pins(ns_here).select{|s| s.name == start}.first
    return (cv.return_type || api_map.infer_assignment_node_type(cv.node, cv.namespace)) unless cv.nil?
  elsif start.start_with?('@')
    scope = (node.type == :def ? :instance : :class)
    iv = api_map.get_instance_variable_pins(ns_here, scope).select{|s| s.name == start}.first
    return (iv.return_type || api_map.infer_assignment_node_type(iv.node, iv.namespace)) unless iv.nil?
  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 389

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 130

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 149

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 87

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 115

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

#resolve_object_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 259

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.get_path_suggestions(path)
end

#signatures_at(index) ⇒ Object 



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# File 'lib/solargraph/code_map.rb', line 251

def signatures_at index
  sig = signature_index_before(index)
  return [] if sig.nil?
  word = word_at(sig)
  sugg = suggest_at(sig - word.length)
  sugg.select{|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 94

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

#suggest_at(index, filtered: true, with_snippets: false) ⇒ Array<Solargraph::Suggestion>

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

Returns:



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# File 'lib/solargraph/code_map.rb', line 194

def suggest_at index, filtered: true, with_snippets: false
  return [] if string_at?(index) or string_at?(index - 1) or comment_at?(index)
  signature = get_signature_at(index)
  unless signature.include?('.')
    if signature.start_with?(':')
      return api_map.get_symbols
    elsif 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
    end
  end
  result = []
  type = nil
  if signature.include?('.')
    type = infer_signature_at(index)
    if type.nil? and signature.include?('.')
      last_period = @code[0..index].rindex('.')
      type = infer_signature_at(last_period)
    end
  end
  if type.nil?
    unless signature.include?('.')
      namespace = namespace_at(index)
      if signature.include?('::')
        parts = signature.split('::', -1)
        ns = parts[0..-2].join('::')
        result = api_map.namespaces_in(ns, namespace)
      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) unless (type == '' and signature.include?('.'))
  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 76

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 162

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