# == Pretty-printer for Ruby objects.

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#

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# = Which seems better?

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#

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# non-pretty-printed output by #p is:

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# #<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>>

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#

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# pretty-printed output by #pp is:

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# #<PP:0x81fedf0

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# @buffer=[],

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# @buffer_width=0,

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# @genspace=#<Proc:0x81feda0>,

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# @group_queue=

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# #<PrettyPrint::GroupQueue:0x81fed3c

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# @queue=

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# [[#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],

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# []]>,

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# @group_stack=

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# [#<PrettyPrint::Group:0x81fed78 @break=false, @breakables=[], @depth=0>],

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# @indent=0,

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# @maxwidth=79,

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# @newline="\n",

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# @output=#<IO:0x8114ee4>,

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# @output_width=2>

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#

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# I like the latter. If you do too, this library is for you.

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#

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# = Usage

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#

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# pp(obj)

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#

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# output +obj+ to +$>+ in pretty printed format.

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#

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# It returns +nil+.

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#

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# = Output Customization

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# To define your customized pretty printing function for your classes,

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# redefine a method #pretty_print(+pp+) in the class.

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# It takes an argument +pp+ which is an instance of the class PP.

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# The method should use PP#text, PP#breakable, PP#nest, PP#group and

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# PP#pp to print the object.

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#

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# = Author

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# Tanaka Akira <akr@m17n.org>

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require 'prettyprint'

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module Kernel

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# returns a pretty printed object as a string.

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def pretty_inspect

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PP.pp(self, '')

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end

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private

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# prints arguments in pretty form.

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#

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# pp returns nil.

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def pp(*objs) # :doc:

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objs.each {|obj|

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PP.pp(obj)

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}

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nil

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end

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module_function :pp

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end

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class PP < PrettyPrint

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# Outputs +obj+ to +out+ in pretty printed format of

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# +width+ columns in width.

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#

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# If +out+ is omitted, +$>+ is assumed.

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# If +width+ is omitted, 79 is assumed.

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#

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# PP.pp returns +out+.

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def PP.pp(obj, out=$>, width=79)

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q = PP.new(out, width)

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q.guard_inspect_key {q.pp obj}

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q.flush

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#$pp = q

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out << "\n"

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end

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# Outputs +obj+ to +out+ like PP.pp but with no indent and

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# newline.

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#

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# PP.singleline_pp returns +out+.

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def PP.singleline_pp(obj, out=$>)

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q = SingleLine.new(out)

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q.guard_inspect_key {q.pp obj}

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q.flush

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out

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end

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# :stopdoc:

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def PP.mcall(obj, mod, meth, *args, &block)

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mod.instance_method(meth).bind(obj).call(*args, &block)

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end

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# :startdoc:

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@sharing_detection = false

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class << self

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# Returns the sharing detection flag as a boolean value.

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# It is false by default.

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attr_accessor :sharing_detection

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end

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module PPMethods

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InspectKey = :__inspect_key__

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def guard_inspect_key

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if Thread.current[InspectKey] == nil

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Thread.current[InspectKey] = []

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end

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save = Thread.current[InspectKey]

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begin

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Thread.current[InspectKey] = []

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yield

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ensure

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Thread.current[InspectKey] = save

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end

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end

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# Adds +obj+ to the pretty printing buffer

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# using Object#pretty_print or Object#pretty_print_cycle.

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#

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# Object#pretty_print_cycle is used when +obj+ is already

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# printed, a.k.a the object reference chain has a cycle.

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def pp(obj)

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id = obj.__id__

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if Thread.current[InspectKey].include? id

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group {obj.pretty_print_cycle self}

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return

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end

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begin

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Thread.current[InspectKey] << id

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group {obj.pretty_print self}

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ensure

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Thread.current[InspectKey].pop unless PP.sharing_detection

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end

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end

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# A convenience method which is same as follows:

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#

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

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def object_group(obj, &block) # :yield:

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group(1, '#<' + obj.class.name, '>', &block)

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end

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def object_address_group(obj, &block)

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id = "%x" % (obj.__id__ * 2)

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id.sub!(/\Af(?=[[:xdigit:]]{2}+\z)/, '') if id.sub!(/\A\.\./, '')

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group(1, "\#<#{obj.class}:0x#{id}", '>', &block)

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end

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# A convenience method which is same as follows:

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#

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# text ','

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# breakable

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def comma_breakable

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text ','

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breakable

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end

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# Adds a separated list.

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# The list is separated by comma with breakable space, by default.

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#

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# #seplist iterates the +list+ using +iter_method+.

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# It yields each object to the block given for #seplist.

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# The procedure +separator_proc+ is called between each yields.

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#

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# If the iteration is zero times, +separator_proc+ is not called at all.

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#

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# If +separator_proc+ is nil or not given,

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# +lambda { comma_breakable }+ is used.

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# If +iter_method+ is not given, :each is used.

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#

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# For example, following 3 code fragments has similar effect.

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#

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# q.seplist([1,2,3]) {|v| xxx v }

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#

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# q.seplist([1,2,3], lambda { comma_breakable }, :each) {|v| xxx v }

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#

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# xxx 1

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# q.comma_breakable

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# xxx 2

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# q.comma_breakable

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# xxx 3

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def seplist(list, sep=nil, iter_method=:each) # :yield: element

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sep ||= lambda { comma_breakable }

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first = true

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list.__send__(iter_method) {|*v|

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if first

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first = false

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else

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sep.call

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end

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yield(*v)

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}

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end

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def pp_object(obj)

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object_address_group(obj) {

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seplist(obj.pretty_print_instance_variables, lambda { text ',' }) {|v|

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breakable

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v = v.to_s if Symbol === v

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text v

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text '='

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group(1) {

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breakable ''

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pp(obj.instance_eval(v))

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}

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}

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}

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end

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def pp_hash(obj)

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group(1, '{', '}') {

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seplist(obj, nil, :each_pair) {|k, v|

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group {

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pp k

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text '=>'

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group(1) {

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breakable ''

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pp v

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}

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}

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}

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}

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end

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end

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include PPMethods

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class SingleLine < PrettyPrint::SingleLine

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include PPMethods

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end

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module ObjectMixin

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# 1. specific pretty_print

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# 2. specific inspect

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# 3. specific to_s if instance variable is empty

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# 4. generic pretty_print

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# A default pretty printing method for general objects.

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# It calls #pretty_print_instance_variables to list instance variables.

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#

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# If +self+ has a customized (redefined) #inspect method,

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# the result of self.inspect is used but it obviously has no

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# line break hints.

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#

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# This module provides predefined #pretty_print methods for some of

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# the most commonly used built-in classes for convenience.

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def pretty_print(q)

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if /\(Kernel\)#/ !~ Object.instance_method(:method).bind(self).call(:inspect).inspect

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q.text self.inspect

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elsif /\(Kernel\)#/ !~ Object.instance_method(:method).bind(self).call(:to_s).inspect && instance_variables.empty?

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q.text self.to_s

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else

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q.pp_object(self)

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end

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end

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# A default pretty printing method for general objects that are

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# detected as part of a cycle.

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def pretty_print_cycle(q)

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q.object_address_group(self) {

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q.breakable

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q.text '...'

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}

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end

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# Returns a sorted array of instance variable names.

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#

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# This method should return an array of names of instance variables as symbols or strings as:

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# +[:@a, :@b]+.

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def pretty_print_instance_variables

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instance_variables.sort

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end

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# Is #inspect implementation using #pretty_print.

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# If you implement #pretty_print, it can be used as follows.

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#

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# alias inspect pretty_print_inspect

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#

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# However, doing this requires that every class that #inspect is called on

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# implement #pretty_print, or a RuntimeError will be raised.

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def pretty_print_inspect

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if /\(PP::ObjectMixin\)#/ =~ Object.instance_method(:method).bind(self).call(:pretty_print).inspect

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raise "pretty_print is not overridden for #{self.class}"

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end

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PP.singleline_pp(self, '')

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end

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end

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end

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class Array

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def pretty_print(q)

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q.group(1, '[', ']') {

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q.seplist(self) {|v|

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q.pp v

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}

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}

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end

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def pretty_print_cycle(q)

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q.text(empty? ? '[]' : '[...]')

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end

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end

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class Hash

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def pretty_print(q)

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q.pp_hash self

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end

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def pretty_print_cycle(q)

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q.text(empty? ? '{}' : '{...}')

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end

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end

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class << ENV

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def pretty_print(q)

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q.pp_hash self

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end

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end

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class Struct

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def pretty_print(q)

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q.group(1, '#<struct ' + PP.mcall(self, Kernel, :class).name, '>') {

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q.seplist(PP.mcall(self, Struct, :members), lambda { q.text "," }) {|member|

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q.breakable

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q.text member.to_s

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q.text '='

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q.group(1) {

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q.breakable ''

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q.pp self[member]

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}

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}

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}

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end

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def pretty_print_cycle(q)

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q.text sprintf("#<struct %s:...>", PP.mcall(self, Kernel, :class).name)

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end

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end

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class Range

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def pretty_print(q)

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q.pp self.begin

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q.breakable ''

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q.text(self.exclude_end? ? '...' : '..')

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q.breakable ''

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q.pp self.end

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end

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end

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class File

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class Stat

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def pretty_print(q)

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require 'etc.so'

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q.object_group(self) {

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q.breakable

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q.text sprintf("dev=0x%x", self.dev); q.comma_breakable

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q.text "ino="; q.pp self.ino; q.comma_breakable

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q.group {

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m = self.mode

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q.text sprintf("mode=0%o", m)

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q.breakable

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q.text sprintf("(%s %c%c%c%c%c%c%c%c%c)",

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self.ftype,

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(m & 0400 == 0 ? ?- : ?r),

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(m & 0200 == 0 ? ?- : ?w),

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(m & 0100 == 0 ? (m & 04000 == 0 ? ?- : ?S) :

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(m & 04000 == 0 ? ?x : ?s)),

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(m & 0040 == 0 ? ?- : ?r),

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(m & 0020 == 0 ? ?- : ?w),

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(m & 0010 == 0 ? (m & 02000 == 0 ? ?- : ?S) :

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(m & 02000 == 0 ? ?x : ?s)),

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(m & 0004 == 0 ? ?- : ?r),

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(m & 0002 == 0 ? ?- : ?w),

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(m & 0001 == 0 ? (m & 01000 == 0 ? ?- : ?T) :

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(m & 01000 == 0 ? ?x : ?t)))

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}

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q.comma_breakable

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q.text "nlink="; q.pp self.nlink; q.comma_breakable

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q.group {

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q.text "uid="; q.pp self.uid

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begin

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pw = Etc.getpwuid(self.uid)

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rescue ArgumentError

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end

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if pw

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q.breakable; q.text "(#{pw.name})"

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end

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}

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q.comma_breakable

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q.group {

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q.text "gid="; q.pp self.gid

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begin

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gr = Etc.getgrgid(self.gid)

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rescue ArgumentError

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end

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if gr

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q.breakable; q.text "(#{gr.name})"

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end

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}

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q.comma_breakable

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q.group {

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q.text sprintf("rdev=0x%x", self.rdev)

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q.breakable

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q.text sprintf('(%d, %d)', self.rdev_major, self.rdev_minor)

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}

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q.comma_breakable

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q.text "size="; q.pp self.size; q.comma_breakable

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q.text "blksize="; q.pp self.blksize; q.comma_breakable

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q.text "blocks="; q.pp self.blocks; q.comma_breakable

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q.group {

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t = self.atime

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q.text "atime="; q.pp t

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q.breakable; q.text "(#{t.tv_sec})"

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}

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q.comma_breakable

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q.group {

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t = self.mtime

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q.text "mtime="; q.pp t

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q.breakable; q.text "(#{t.tv_sec})"

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}

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q.comma_breakable

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q.group {

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t = self.ctime

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q.text "ctime="; q.pp t

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q.breakable; q.text "(#{t.tv_sec})"

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}

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}

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end

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end

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end

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class MatchData

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def pretty_print(q)

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q.object_group(self) {

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q.breakable

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q.seplist(1..self.size, lambda { q.breakable }) {|i|

[445] Fix | Delete

q.pp self[i-1]

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}

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}

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end

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end

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class Object

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include PP::ObjectMixin

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end

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[Numeric, Symbol, FalseClass, TrueClass, NilClass, Module].each {|c|

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c.class_eval {

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def pretty_print_cycle(q)

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q.text inspect

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end

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}

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}

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[Numeric, FalseClass, TrueClass, Module].each {|c|

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c.class_eval {

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def pretty_print(q)

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q.text inspect

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end

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}

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}

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# :enddoc:

[472] Fix | Delete

if __FILE__ == $0

[473] Fix | Delete

require 'test/unit'

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[475] Fix | Delete

class PPTest < Test::Unit::TestCase

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def test_list0123_12

[477] Fix | Delete

assert_equal("[0, 1, 2, 3]\n", PP.pp([0,1,2,3], '', 12))

[478] Fix | Delete

end

[479] Fix | Delete

[480] Fix | Delete

def test_list0123_11

[481] Fix | Delete

assert_equal("[0,\n 1,\n 2,\n 3]\n", PP.pp([0,1,2,3], '', 11))

[482] Fix | Delete

end

[483] Fix | Delete

[484] Fix | Delete

OverriddenStruct = Struct.new("OverriddenStruct", :members, :class)

[485] Fix | Delete

def test_struct_override_members # [ruby-core:7865]

[486] Fix | Delete

a = OverriddenStruct.new(1,2)

[487] Fix | Delete

assert_equal("#<struct Struct::OverriddenStruct members=1, class=2>\n", PP.pp(a, ''))

[488] Fix | Delete

end

[489] Fix | Delete

[490] Fix | Delete

def test_redefined_method

[491] Fix | Delete

o = ""

[492] Fix | Delete

def o.method

[493] Fix | Delete

end

[494] Fix | Delete

assert_equal(%(""\n), PP.pp(o, ""))

[495] Fix | Delete

end

[496] Fix | Delete

end

[497] Fix | Delete

[498] Fix | Delete

class HasInspect

[499] Fix | Delete