module PP::PPMethods
Public Instance Methods
Check whether the object_id id
is in the current buffer of objects to be pretty printed. Used to break cycles in chains of objects to be pretty printed.
# File pp.rb, line 167 def check_inspect_key(id) Thread.current[:__recursive_key__] && Thread.current[:__recursive_key__][:inspect] && Thread.current[:__recursive_key__][:inspect].include?(id) end
A convenience method which is same as follows:
text ',' breakable
# File pp.rb, line 226 def comma_breakable text ',' breakable end
Yields to a block and preserves the previous set of objects being printed.
# File pp.rb, line 145 def guard_inspect_key if Thread.current[:__recursive_key__] == nil Thread.current[:__recursive_key__] = {}.compare_by_identity end if Thread.current[:__recursive_key__][:inspect] == nil Thread.current[:__recursive_key__][:inspect] = {}.compare_by_identity end save = Thread.current[:__recursive_key__][:inspect] begin Thread.current[:__recursive_key__][:inspect] = {}.compare_by_identity yield ensure Thread.current[:__recursive_key__][:inspect] = save end end
A convenience method, like object_group
, but also reformats the Object’s object_id.
# File pp.rb, line 216 def object_address_group(obj, &block) str = Kernel.instance_method(:to_s).bind_call(obj) str.chomp!('>') group(1, str, '>', &block) end
A convenience method which is same as follows:
group(1, '#<' + obj.class.name, '>') { ... }
# File pp.rb, line 210 def object_group(obj, &block) # :yield: group(1, '#<' + obj.class.name, '>', &block) end
Removes an object from the set of objects being pretty printed.
# File pp.rb, line 180 def pop_inspect_key(id) Thread.current[:__recursive_key__][:inspect].delete id end
Adds obj
to the pretty printing buffer using Object#pretty_print or Object#pretty_print_cycle.
Object#pretty_print_cycle is used when obj
is already printed, a.k.a the object reference chain has a cycle.
# File pp.rb, line 189 def pp(obj) # If obj is a Delegator then use the object being delegated to for cycle # detection obj = obj.__getobj__ if defined?(::Delegator) and obj.is_a?(::Delegator) if check_inspect_key(obj) group {obj.pretty_print_cycle self} return end begin push_inspect_key(obj) group {obj.pretty_print self} ensure pop_inspect_key(obj) unless PP.sharing_detection end end
A pretty print for a Hash
# File pp.rb, line 285 def pp_hash(obj) group(1, '{', '}') { seplist(obj, nil, :each_pair) {|k, v| group { pp k text '=>' group(1) { breakable '' pp v } } } } end
A present standard failsafe for pretty printing any given Object
# File pp.rb, line 269 def pp_object(obj) object_address_group(obj) { seplist(obj.pretty_print_instance_variables, lambda { text ',' }) {|v| breakable v = v.to_s if Symbol === v text v text '=' group(1) { breakable '' pp(obj.instance_eval(v)) } } } end
Adds the object_id id
to the set of objects being pretty printed, so as to not repeat objects.
# File pp.rb, line 175 def push_inspect_key(id) Thread.current[:__recursive_key__][:inspect][id] = true end
Adds a separated list. The list is separated by comma with breakable space, by default.
seplist
iterates the list
using iter_method
. It yields each object to the block given for seplist
. The procedure separator_proc
is called between each yields.
If the iteration is zero times, separator_proc
is not called at all.
If separator_proc
is nil or not given, +lambda { comma_breakable
}+ is used. If iter_method
is not given, :each is used.
For example, following 3 code fragments has similar effect.
q.seplist([1,2,3]) {|v| xxx v } q.seplist([1,2,3], lambda { q.comma_breakable }, :each) {|v| xxx v } xxx 1 q.comma_breakable xxx 2 q.comma_breakable xxx 3
# File pp.rb, line 255 def seplist(list, sep=nil, iter_method=:each) # :yield: element sep ||= lambda { comma_breakable } first = true list.__send__(iter_method) {|*v| if first first = false else sep.call end RUBY_VERSION >= "3.0" ? yield(*v, **{}) : yield(*v) } end