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:
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.
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
Permit block/lambda nodes to mark newlines within themselves.
# 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
Mark if/unless nodes as newlines.
# File lib/prism/parse_result/newlines.rb, line 41 def visit_if_node(node) node.set_newline_flag(@newline_marked) super(node) end
Permit statements lists to mark newlines within themselves.
# 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