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Showing content from https://ruby-syntax-tree.github.io/syntax_tree/SyntaxTree/VarRef.html below:

class SyntaxTree::VarRef - RDoc Documentation

1. SyntaxTree::
2. VarRef

VarRef represents a variable reference.

true

This can be a plain local variable like the example above. It can also be a constant, a class variable, a global variable, an instance variable, a keyword (like self, nil, true, or false), or a numbered block variable.

def initialize(value:, location:)
  @value = value
  @location = location
  @comments = []
end

def ===(other)
  other.is_a?(VarRef) && value === other.value
end

def accept(visitor)
  visitor.visit_var_ref(self)
end

def child_nodes
  [value]
end

def copy(value: nil, location: nil)
  node =
    VarRef.new(
      value: value || self.value,
      location: location || self.location
    )

  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys)
  { value: value, location: location, comments: comments }
end

def format(q)
  q.format(value)
end

def pin(parent, pin)
  replace =
    PinnedVarRef.new(value: value, location: pin.location.to(location))

  parent
    .deconstruct_keys([])
    .each do |key, value|
      if value == self
        parent.instance_variable_set(:"@#{key}", replace)
        break
      elsif value.is_a?(Array) && (index = value.index(self))
        parent.public_send(key)[index] = replace
        break
      elsif value.is_a?(Array) &&
            (index = value.index { |(_k, v)| v == self })
        parent.public_send(key)[index][1] = replace
        break
      end
    end
end

Oh man I hate this so much. Basically, ripper doesn’t provide enough functionality to actually know where pins are within an expression. So we have to walk the tree ourselves and insert more information. In doing so, we have to replace this node by a pinned node when necessary.

To be clear, this method should just not exist. It’s not good. It’s a place of shame. But it’s necessary for now, so I’m keeping it.

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