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.
A string field represents a string value on a node. It almost always represents the unescaped value of a string-like literal. It resolves to a string in Ruby.
An integer field represents an integer value. It is used to represent the value of an integer literal, the depth of local variables, and the number of a numbered reference. It resolves to an Integer in Ruby.
Searches for gems starting with the supplied argument.