class Prism::NodeInspector

:nodoc:
implementations of child nodes.
This object is responsible for generating the output for the inspect method

def <<(line)

Appends a line to the output with the current prefix. 
def <<(line)
  output << "#{prefix}#{line}"
end

def child_inspector(append)

Returns a new inspector that can be used to inspect a child node. 
def child_inspector(append)
  NodeInspector.new("#{prefix}#{append}")
end

def child_node(node, append)

Generates a string that represents a child node. 
def child_node(node, append)
  node.inspect(child_inspector(append)).delete_prefix(prefix)
end

def header(node)

for any given node.
This generates a string that is used as the header of the inspect output 
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

def initialize(prefix = "") 

def initialize(prefix = "")
  @prefix = prefix
  @output = +""
end

def list(prefix, nodes)

using the box drawing characters to make the output look nice.
Generates a string that represents a list of nodes. It handles properly 
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

def location(value)

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

def to_str

Returns the output as a string. 
def to_str
  output
end