class Prism::ParseResult::Newlines

The :line tracepoint event gets fired whenever the Ruby VM encounters an expression on a new line. The types of expressions that can trigger this event are:

  • if statements

  • unless statements

  • nodes that are children of statements lists

In order to keep track of the newlines, we have a list of offsets that come back from the parser. We assign these offsets to the first nodes that we find in the tree that are on those lines.

Note that the logic in this file should be kept in sync with the Java MarkNewlinesVisitor, since that visitor is responsible for marking the newlines for JRuby/TruffleRuby.

Public Class Methods

new (newline_marked)

Create a new Newlines visitor with the given newline offsets.

# File lib/prism/parse_result/newlines.rb, line 22
def initialize(newline_marked)
  @newline_marked = newline_marked
end

Public Instance Methods

visit_block_node (node)

Permit block/lambda nodes to mark newlines within themselves.

Calls superclass method 
# File lib/prism/parse_result/newlines.rb, line 27
def visit_block_node(node)
  old_newline_marked = @newline_marked
  @newline_marked = Array.new(old_newline_marked.size, false)

  begin
    super(node)
  ensure
    @newline_marked = old_newline_marked
  end
end
Also aliased as: visit_lambda_node
visit_if_node (node)

Mark if/unless nodes as newlines.

Calls superclass method 
# File lib/prism/parse_result/newlines.rb, line 41
def visit_if_node(node)
  node.set_newline_flag(@newline_marked)
  super(node)
end
Also aliased as: visit_unless_node
visit_statements_node (node)

Permit statements lists to mark newlines within themselves.

Calls superclass method 
# File lib/prism/parse_result/newlines.rb, line 49
def visit_statements_node(node)
  node.body.each do |child|
    child.set_newline_flag(@newline_marked)
  end
  super(node)
end