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module Morpher
# Evaluation and Evaluator pretty printer
class Printer
include Adamantium::Flat, Concord.new(:object, :output, :indent_level)
INDENT = ' '.freeze
REGISTRY = {}
# Run pretty printer on object
#
# @param [Object] object
# the object to be pretty printed
# @param [IO] output
# the output to write to
# @param [Fixnum] indent_level
# the current indentation level
#
# @return [self]
#
# @api private
#
def self.run(object, output, indent_level = 0)
printer = new(object, output, indent_level)
block = lookup(object)
printer.instance_eval(&block)
end
# Perform type lookup
#
# FIXME: Instanciate type lookup once and allow caching.
#
# @param [Evaluation, Evaluator] object
#
# @return [Proc]
# if found
#
# @raise [PrinterMissingException]
# otherwise
#
# @api private
#
def self.lookup(object)
TypeLookup.new(REGISTRY).call(object)
end
private
# Visit a child
#
# @param [Node] child
#
# @api private
#
# @return [undefined]
#
def visit_child(child)
self.class.run(child, output, indent_level.succ)
end
# Visit a child by name
#
# @param [Symbol] name
# the attribute name of the child to visit
#
# @return [undefined]
#
# @api private
#
def visit(name)
child = object.public_send(name)
child_label(name)
visit_child(child)
end
# Visit many children
#
# @param [Symbol] name
# the name of the collection attribute with children to visit
#
# @return [undefined]
#
# @api private
#
def visit_many(name)
children = object.public_send(name)
child_label(name)
children.each do |child|
visit_child(child)
end
end
# Print attribute class
#
# @param [Symbol] name
#
# @return [undefined]
#
# @api private
#
def attribute_class(name)
label_value(name, object.public_send(name).class)
end
# Print inspected attribute value with label
#
# @return [undefined]
#
# @api private
#
def attribute(name)
label_value(name, object.public_send(name))
end
# Print attributes of object
#
# @return [undefined]
#
# @api private
#
def attributes(*names)
names.each do |name|
attribute(name)
end
end
# Print name of object
#
# @return [undefined]
#
# @api private
#
def name
puts(object.class.name)
end
# Return string indented with current level
#
# @param [String] content
#
# @return [String]
#
# @api private
#
def indented(content)
"#{indentation_prefix}#{content}"
end
# Return indentation prefix
#
# @return [String]
#
# @api private
#
def indentation_prefix
INDENT * indent_level
end
memoize :indentation_prefix
# Add content to output at current indentation and close line
#
# @param [String] content
#
# @return [undefined]
#
# @api private
#
def puts(string)
output.puts(indented(string))
end
# Write content to output at current indentation
#
# @param [String] content
#
# @return [undefined]
#
# @api private
#
def write(string)
output.write(indented(string))
end
# Write child label to output at current indentation
#
# @param [String] label
#
# @return [undefined]
#
# @api private
#
def child_label(string)
puts("#{string}:")
end
# Call block inside indented context
#
# @return [undefined]
#
# @api private
#
def indent(&block)
printer = new(object, output, indent_level.succ)
printer.instance_eval(&block)
end
# Return new printer
#
# @return [Printer]
#
# @api private
#
def new(*arguments)
self.class.new(*arguments)
end
# Print label with value
#
# @param [String] label
# @param [Object] value
#
# @return [undefined]
#
# @api private
#
def label_value(label, value)
write("#{label}: ")
output.puts(value.inspect)
end
end # Printer
end # Morpher
|
