A pretty-printer for Ruby objects.
PP Does Standard output by p returns this:
#<PP:0x81fedf0 @genspace=#<Proc:0x81feda0>, @group_queue=#<PrettyPrint::GroupQueue:0x81fed3c @queue=[[#<PrettyPrint::Group:0x81fed78 @breakables=[], @depth=0, @break=false>], []]>, @buffer=[], @newline="\n", @group_stack=[#<PrettyPrint::Group:0x81fed78 @breakables=[], @depth=0, @break=false>], @buffer_width=0, @indent=0, @maxwidth=79, @output_width=2, @output=#<IO:0x8114ee4>>
Pretty-printed output returns this:
#<PP:0x81fedf0
@buffer=[],
@buffer_width=0,
@genspace=#<Proc:0x81feda0>,
@group_queue=
#<PrettyPrint::GroupQueue:0x81fed3c
@queue=
[[#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],
[]]>,
@group_stack=
[#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],
@indent=0,
@maxwidth=79,
@newline="\n",
@output=#<IO:0x8114ee4>,
@output_width=2>
pp(obj) #=> obj pp obj #=> obj pp(obj1, obj2, ...) #=> [obj1, obj2, ...] pp() #=> nil
Output obj(s) to $> in pretty printed format.
It returns obj(s).
To define a customized pretty printing function for your classes, redefine method #pretty_print(pp) in the class.
#pretty_print takes the pp argument, which is an instance of the PP class. The method uses text, breakable, nest, group and pp to print the object.
JSON To pretty-print JSON refer to JSON#pretty_generate.
Tanaka Akira <akr@fsij.org>
# File tmp/rubies/ruby-3.2.0/lib/pp.rb, line 91
def PP.pp(obj, out=$>, width=width_for(out))
q = PP.new(out, width)
q.guard_inspect_key {q.pp obj}
q.flush
#$pp = q
out << "\n"
end
# File tmp/rubies/ruby-3.2.0/lib/pp.rb, line 120
def sharing_detection
Ractor.current[:pp_sharing_detection]
end
Returns the sharing detection flag as a boolean value. It is false (nil) by default.
# File tmp/rubies/ruby-3.2.0/lib/pp.rb, line 124
def sharing_detection=(b)
Ractor.current[:pp_sharing_detection] = b
end
Sets the sharing detection flag to b.
# File tmp/rubies/ruby-3.2.0/lib/pp.rb, line 103
def PP.singleline_pp(obj, out=$>)
q = SingleLine.new(out)
q.guard_inspect_key {q.pp obj}
q.flush
out
end
Outputs obj to out like PP.pp but with no indent and newline.
PP.singleline_pp returns out.
# File tmp/rubies/ruby-3.2.0/lib/pp.rb, line 74
def PP.width_for(out)
begin
require 'io/console'
_, width = out.winsize
rescue LoadError, NoMethodError, SystemCallError
end
(width || ENV['COLUMNS']&.to_i&.nonzero? || 80) - 1
end
Returns the usable width for out. As the width of out:
If out is assigned to a tty device, its width is used.
Otherwise, or it could not get the value, the COLUMN environment variable is assumed to be set to the width.
If COLUMN is not set to a non-zero number, 80 is assumed.
And finally, returns the above width value - 1.
This -1 is for Windows command prompt, which moves the cursor to the next line if it reaches the last column.