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.

This file is autoloaded only when ‘mark_newlines!` is called, so the re-opening of the various nodes in this file will only be performed in that case. We do that to avoid storing the extra `@newline` instance variable on every node if we don’t need it.

# File lib/prism/parse_result/newlines.rb, line 27
def initialize(lines)
  # @type var lines: Integer
  @lines = Array.new(1 + lines, false)
end

# File lib/prism/parse_result/newlines.rb, line 33
def visit_block_node(node)
  old_lines = @lines
  @lines = Array.new(old_lines.size, false)

  begin
    super(node)
  ensure
    @lines = old_lines
  end
end

# File lib/prism/parse_result/newlines.rb, line 47
def visit_if_node(node)
  node.newline_flag!(@lines)
  super(node)
end

# File lib/prism/parse_result/newlines.rb, line 55
def visit_statements_node(node)
  node.body.each do |child|
    child.newline_flag!(@lines)
  end
  super(node)
end