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Contents
# frozen_string_literal: true
module SyntaxTree
class Visitor
# This visitor pretty-prints the AST into an equivalent s-expression.
class PrettyPrintVisitor < FieldVisitor
attr_reader :q
def initialize(q)
@q = q
end
# This is here because we need to make sure the operator is cast to a
# string before we print it out.
def visit_binary(node)
node(node, "binary") do
field("left", node.left)
text("operator", node.operator.to_s)
field("right", node.right)
comments(node)
end
end
# This is here to make it a little nicer to look at labels since they
# typically have their : at the end of the value.
def visit_label(node)
node(node, "label") do
q.breakable
q.text(":")
q.text(node.value[0...-1])
comments(node)
end
end
private
def comments(node)
return if node.comments.empty?
q.breakable
q.group(2, "(", ")") do
q.seplist(node.comments) { |comment| q.pp(comment) }
end
end
def field(_name, value)
q.breakable
q.pp(value)
end
def list(_name, values)
q.breakable
q.group(2, "(", ")") { q.seplist(values) { |value| q.pp(value) } }
end
def node(_node, type)
q.group(2, "(", ")") do
q.text(type)
yield
end
end
def pairs(_name, values)
q.group(2, "(", ")") do
q.seplist(values) do |(key, value)|
q.pp(key)
if value
q.text("=")
q.group(2) do
q.breakable("")
q.pp(value)
end
end
end
end
end
def text(_name, value)
q.breakable
q.text(value)
end
end
end
end
Version data entries
31 entries across 31 versions & 1 rubygems