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# frozen_string_literal: true
module Prism
# This object is responsible for generating the output for the inspect method
# implementations of child nodes.
class NodeInspector # :nodoc:
attr_reader :prefix, :output
def initialize(prefix = "")
@prefix = prefix
@output = +""
end
# Appends a line to the output with the current prefix.
def <<(line)
output << "#{prefix}#{line}"
end
# This generates a string that is used as the header of the inspect output
# for any given node.
def header(node)
output = +"@ #{node.class.name.split("::").last} ("
output << "location: (#{node.location.start_line},#{node.location.start_column})-(#{node.location.end_line},#{node.location.end_column})"
output << ", newline: true" if node.newline?
output << ")\n"
output
end
# Generates a string that represents a list of nodes. It handles properly
# using the box drawing characters to make the output look nice.
def list(prefix, nodes)
output = +"(length: #{nodes.length})\n"
last_index = nodes.length - 1
nodes.each_with_index do |node, index|
pointer, preadd = (index == last_index) ? ["└── ", " "] : ["├── ", "│ "]
node_prefix = "#{prefix}#{preadd}"
output << node.inspect(NodeInspector.new(node_prefix)).sub(node_prefix, "#{prefix}#{pointer}")
end
output
end
# Generates a string that represents a location field on a node.
def location(value)
if value
"(#{value.start_line},#{value.start_column})-(#{value.end_line},#{value.end_column}) = #{value.slice.inspect}"
else
"∅"
end
end
# Generates a string that represents a child node.
def child_node(node, append)
node.inspect(child_inspector(append)).delete_prefix(prefix)
end
# Returns a new inspector that can be used to inspect a child node.
def child_inspector(append)
NodeInspector.new("#{prefix}#{append}")
end
# Returns the output as a string.
def to_str
output
end
end
end
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