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author | zzak <zzak@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-02-10 00:10:11 +0000 |
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committer | zzak <zzak@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-02-10 00:10:11 +0000 |
commit | 3952de50bf8e410a5a1ce929b98dbe42a9ab40f3 (patch) | |
tree | 0087c58d39a15d507fd54ada979a7fe23e250a66 /lib/pp.rb | |
parent | cf2da37701897a31951f1b83667ab5575606c297 (diff) | |
download | ruby-3952de50bf8e410a5a1ce929b98dbe42a9ab40f3.tar.gz |
* lib/pp.rb, lib/prettyprint.rb: Documentation for PP and PrettyPrint
Based on a patch by Vincent Batts [ruby-core:51253] [Bug #7656]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39180 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib/pp.rb')
-rw-r--r-- | lib/pp.rb | 91 |
1 files changed, 58 insertions, 33 deletions
@@ -1,7 +1,13 @@ require 'prettyprint' module Kernel - # returns a pretty printed object as a string. + # Returns a pretty printed object as a string. + # + # In order to use this method you must first require the PP module: + # + # require 'pp' + # + # See the PP module for more information. def pretty_inspect PP.pp(self, '') end @@ -10,23 +16,23 @@ module Kernel # prints arguments in pretty form. # # pp returns argument(s). - def pp(*objs) # :doc: + def pp(*objs) # :nodoc: objs.each {|obj| PP.pp(obj) } objs.size <= 1 ? objs.first : objs end - module_function :pp + module_function :pp # :nodoc: end -# == Pretty-printer for Ruby objects. +# Pretty-printer for Ruby objects. # -# = Which seems better? +# == Which seems better? # -# non-pretty-printed output by #p is: +# Standard output by #p like 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 by #pp is: +# Or the pretty-printed version: # #<PP:0x81fedf0 # @buffer=[], # @buffer_width=0, @@ -46,25 +52,27 @@ end # # I like the latter. If you do too, this library is for you. # -# = Usage +# == Usage # # pp(obj) #=> obj # pp(obj1, obj2, ...) #=> [obj1, obj2, ...] # pp() #=> nil # -# output +obj(s)+ to +$>+ in pretty printed format. +# Output <tt>obj(s)</tt> to <tt>$></tt> in pretty printed format. # -# It returns +obj(s)+. +# It returns <tt>obj(s)</tt>. # # = Output Customization +# # To define your customized pretty printing function for your classes, # redefine a method #pretty_print(+pp+) in the class. +# # It takes an argument +pp+ which is an instance of the class PP. -# The method should use PP#text, PP#breakable, PP#nest, PP#group and -# PP#pp to print the object. +# The method should use #text, #breakable, #nest, #group and #pp to print the +# object. # # = Author -# Tanaka Akira <akr@m17n.org> +# Tanaka Akira <akr@fsij.org> class PP < PrettyPrint # Outputs +obj+ to +out+ in pretty printed format of # +width+ columns in width. @@ -106,6 +114,9 @@ class PP < PrettyPrint end module PPMethods + + # Yields to a block + # and preserves the previous set of objects being printed. def guard_inspect_key if Thread.current[:__recursive_key__] == nil Thread.current[:__recursive_key__] = {}.untrust @@ -125,14 +136,22 @@ class PP < PrettyPrint end end + # 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. def check_inspect_key(id) Thread.current[:__recursive_key__] && Thread.current[:__recursive_key__][:inspect] && Thread.current[:__recursive_key__][:inspect].include?(id) end + + # Adds the object_id +id+ to the set of objects being pretty printed, so + # as to not repeat objects. def push_inspect_key(id) Thread.current[:__recursive_key__][:inspect][id] = true end + + # Removes an object from the set of objects being pretty printed. def pop_inspect_key(id) Thread.current[:__recursive_key__][:inspect].delete id end @@ -165,15 +184,19 @@ class PP < PrettyPrint group(1, '#<' + obj.class.name, '>', &block) end + # A mask used in formating object_id's into a hexadecimal id PointerMask = (1 << ([""].pack("p").size * 8)) - 1 case Object.new.inspect when /\A\#<Object:0x([0-9a-f]+)>\z/ + # String Formating for hexadecimal id PointerFormat = "%0#{$1.length}x" else PointerFormat = "%x" end + # A convenience method, like object_group, but also reformats the Object's + # object_id. def object_address_group(obj, &block) id = PointerFormat % (obj.object_id * 2 & PointerMask) group(1, "\#<#{obj.class}:0x#{id}", '>', &block) @@ -225,6 +248,7 @@ class PP < PrettyPrint } end + # A present standard failsafe for pretty printing any given Object def pp_object(obj) object_address_group(obj) { seplist(obj.pretty_print_instance_variables, lambda { text ',' }) {|v| @@ -240,6 +264,7 @@ class PP < PrettyPrint } end + # A pretty print for a Hash def pp_hash(obj) group(1, '{', '}') { seplist(obj, nil, :each_pair) {|k, v| @@ -258,7 +283,7 @@ class PP < PrettyPrint include PPMethods - class SingleLine < PrettyPrint::SingleLine + class SingleLine < PrettyPrint::SingleLine # :nodoc: include PPMethods end @@ -324,8 +349,8 @@ class PP < PrettyPrint end end -class Array - def pretty_print(q) +class Array # :nodoc: + def pretty_print(q) # :nodoc: q.group(1, '[', ']') { q.seplist(self) {|v| q.pp v @@ -333,23 +358,23 @@ class Array } end - def pretty_print_cycle(q) + def pretty_print_cycle(q) # :nodoc: q.text(empty? ? '[]' : '[...]') end end -class Hash - def pretty_print(q) +class Hash # :nodoc: + def pretty_print(q) # :nodoc: q.pp_hash self end - def pretty_print_cycle(q) + def pretty_print_cycle(q) # :nodoc: q.text(empty? ? '{}' : '{...}') end end -class << ENV - def pretty_print(q) +class << ENV # :nodoc: + def pretty_print(q) # :nodoc: h = {} ENV.keys.sort.each {|k| h[k] = ENV[k] @@ -358,8 +383,8 @@ class << ENV end end -class Struct - def pretty_print(q) +class Struct # :nodoc: + def pretty_print(q) # :nodoc: q.group(1, sprintf("#<struct %s", PP.mcall(self, Kernel, :class).name), '>') { q.seplist(PP.mcall(self, Struct, :members), lambda { q.text "," }) {|member| q.breakable @@ -373,13 +398,13 @@ class Struct } end - def pretty_print_cycle(q) + def pretty_print_cycle(q) # :nodoc: q.text sprintf("#<struct %s:...>", PP.mcall(self, Kernel, :class).name) end end -class Range - def pretty_print(q) +class Range # :nodoc: + def pretty_print(q) # :nodoc: q.pp self.begin q.breakable '' q.text(self.exclude_end? ? '...' : '..') @@ -388,9 +413,9 @@ class Range end end -class File < IO - class Stat - def pretty_print(q) +class File < IO # :nodoc: + class Stat # :nodoc: + def pretty_print(q) # :nodoc: require 'etc.so' q.object_group(self) { q.breakable @@ -470,8 +495,8 @@ class File < IO end end -class MatchData - def pretty_print(q) +class MatchData # :nodoc: + def pretty_print(q) # :nodoc: nc = [] self.regexp.named_captures.each {|name, indexes| indexes.each {|i| nc[i] = name } @@ -495,7 +520,7 @@ class MatchData end end -class Object < BasicObject +class Object < BasicObject # :nodoc: include PP::ObjectMixin end |