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Dir : ~/opt/alt/ruby19/share/ri/1.9.1/system/Enumerable/
View File Name : chunk-i.ri

U:RDoc::AnyMethod[iI"
chunk:ETI"Enumerable#chunk;TF:publico:RDoc::Markup::Document:@parts[o:RDoc::Markup::Paragraph;	[I"5Creates an enumerator for each chunked elements.;TI"FThe consecutive elements which have same block value are chunked.;To:RDoc::Markup::BlankLine�o;
;	[I"SThe result enumerator yields the block value and an array of chunked elements.;TI"/So "each" method can be called as follows.;T@o:RDoc::Markup::Verbatim;	[I"4enum.chunk {|elt| key }.each {|key, ary| ... }
;FI"Jenum.chunk(initial_state) {|elt, state| key }.each {|key, ary| ... }
;Fo;
;	[I"AFor example, consecutive even numbers and odd numbers can be;TI"splitted as follows.;T@o;;	[I"([3,1,4,1,5,9,2,6,5,3,5].chunk {|n|
;FI"  n.even?
;FI"}.each {|even, ary|
;FI"  p [even, ary]
;FI"}
;FI"#=> [false, [3, 1]]
;FI"#   [true, [4]]
;FI"#   [false, [1, 5, 9]]
;FI"#   [true, [2, 6]]
;FI"#   [false, [5, 3, 5]]
;Fo;
;	[I"DThis method is especially useful for sorted series of elements.;TI"@The following example counts words for each initial letter.;T@o;;	[I"8open("/usr/share/dict/words", "r:iso-8859-1") {|f|
;FI"O  f.chunk {|line| line.ord }.each {|ch, lines| p [ch.chr, lines.length] }
;FI"}
;FI"#=> ["\n", 1]
;FI"#   ["A", 1327]
;FI"#   ["B", 1372]
;FI"#   ["C", 1507]
;FI"#   ["D", 791]
;FI"
#   ...
;Fo;
;	[I"2The following key values has special meaning:;To:RDoc::Markup::List:
@type:BULLET:@items[o:RDoc::Markup::ListItem:@label0;	[o;
;	[I"Anil and :_separator specifies that the elements are dropped.;To;;0;	[o;
;	[I"I:_alone specifies that the element should be chunked as a singleton.;To;
;	[I";Other symbols which begins an underscore are reserved.;T@o;
;	[I"=nil and :_separator can be used to ignore some elements.;TI"RFor example, the sequence of hyphens in svn log can be eliminated as follows.;T@o;;	[I"sep = "-"*72 + "\n"
;FI"%IO.popen("svn log README") {|f|
;FI"  f.chunk {|line|
;FI"    line != sep || nil
;FI"  }.each {|_, lines|
;FI"    pp lines
;FI"	  }
;FI"}
;FI"U#=> ["r20018 | knu | 2008-10-29 13:20:42 +0900 (Wed, 29 Oct 2008) | 2 lines\n",
;FI"#    "\n",
;FI"D#    "* README, README.ja: Update the portability section.\n",
;FI"#    "\n"]
;FI"U#   ["r16725 | knu | 2008-05-31 23:34:23 +0900 (Sat, 31 May 2008) | 2 lines\n",
;FI"#    "\n",
;FI"F#    "* README, README.ja: Add a note about default C flags.\n",
;FI"#    "\n"]
;FI"
#   ...
;Fo;
;	[I"Bparagraphs separated by empty lines can be parsed as follows.;T@o;;	[
I"*File.foreach("README").chunk {|line|
;FI"   /\A\s*\z/ !~ line || nil
;FI"}.each {|_, lines|
;FI"  pp lines
;FI"}
;Fo;
;	[I";:_alone can be used to pass through bunch of elements.;TI">For example, sort consecutive lines formed as Foo#bar and;TI"4pass other lines, chunk can be used as follows.;T@o;;	[I"$pat = /\A[A-Z][A-Za-z0-9_]+\#/
;FI"open(filename) {|f|
;FI"G  f.chunk {|line| pat =~ line ? $& : :_alone }.each {|key, lines|
;FI"    if key != :_alone
;FI"%      print lines.sort.join('')
;FI"    else
;FI"       print lines.join('')
;FI"
    end
;FI"	  }
;FI"}
;Fo;
;	[
I"AIf the block needs to maintain state over multiple elements,;TI"*_initial_state_ argument can be used.;TI"If non-nil value is given,;TI"Jit is duplicated for each "each" method invocation of the enumerator.;TI"UThe duplicated object is passed to 2nd argument of the block for "chunk" method.;T:
@file0I"enum.chunk {|elt| ... }                       -> an_enumerator
enum.chunk(initial_state) {|elt, state| ... } -> an_enumerator
 ;T0[�I"(p1 = v1);FI"enum.c;T