Module: PP::PPMethods

Included in:
PP, SingleLine
Defined in:
opal/stdlib/pp.rb

Instance Method Summary collapse

Instance Method Details

#check_inspect_key(id) ⇒ Object

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.


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# File 'opal/stdlib/pp.rb', line 132

def check_inspect_key(id)
  Thread.current[:__recursive_key__] &&
  Thread.current[:__recursive_key__][:inspect] &&
  Thread.current[:__recursive_key__][:inspect].include?(id)
end

#comma_breakableObject

A convenience method which is same as follows:

text ',' breakable


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# File 'opal/stdlib/pp.rb', line 191

def comma_breakable
  text ','
  breakable
end

#guard_inspect_keyObject

Yields to a block and preserves the previous set of objects being printed.


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# File 'opal/stdlib/pp.rb', line 110

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

#object_address_group(obj, &block) ⇒ Object

A convenience method, like object_group, but also reformats the Object's object_id.


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# File 'opal/stdlib/pp.rb', line 181

def object_address_group(obj, &block)
  str = Kernel.instance_method(:to_s).bind_call(obj)
  str.chomp!('>')
  group(1, str, '>', &block)
end

#object_group(obj, &block) ⇒ Object

A convenience method which is same as follows:

group(1, '#<' + obj.class.name, '>') { ... }


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# File 'opal/stdlib/pp.rb', line 175

def object_group(obj, &block) # :yield:
  group(1, '#<' + obj.class.name, '>', &block)
end

#pop_inspect_key(id) ⇒ Object

Removes an object from the set of objects being pretty printed.


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# File 'opal/stdlib/pp.rb', line 145

def pop_inspect_key(id)
  Thread.current[:__recursive_key__][:inspect].delete id
end

#pp(obj) ⇒ Object

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.


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# File 'opal/stdlib/pp.rb', line 154

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

#pp_hash(obj) ⇒ Object

A pretty print for a Hash


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# File 'opal/stdlib/pp.rb', line 250

def pp_hash(obj)
  group(1, '{', '}') {
    seplist(obj, nil, :each_pair) {|k, v|
      group {
        pp k
        text '=>'
        group(1) {
          breakable ''
          pp v
        }
      }
    }
  }
end

#pp_object(obj) ⇒ Object

A present standard failsafe for pretty printing any given Object


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# File 'opal/stdlib/pp.rb', line 234

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

#push_inspect_key(id) ⇒ Object

Adds the object_id +id+ to the set of objects being pretty printed, so as to not repeat objects.


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# File 'opal/stdlib/pp.rb', line 140

def push_inspect_key(id)
  Thread.current[:__recursive_key__][:inspect][id] = true
end

#seplist(list, sep = nil, iter_method = :each) ⇒ Object

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


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# File 'opal/stdlib/pp.rb', line 220

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
    yield(*v)
  }
end