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Merge branch 'pullreq/129' into trunk
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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ChangeLog

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Sun Aug 19 01:24:32 2012 Ayumu AIZAWA <[email protected]>
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* enum.c: fix docs. https://github.com/ruby/ruby/pull/129 by
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richardkmichael (Richard Michael).
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Sun Aug 19 00:47:26 2012 Ayumu AIZAWA <[email protected]>
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* lib/fileutils.rb: fix typo.

enum.c

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@@ -2506,27 +2506,26 @@ slicebefore_i(VALUE yielder, VALUE enumerator, int argc, VALUE *argv)
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*
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* Creates an enumerator for each chunked elements.
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* The beginnings of chunks are defined by _pattern_ and the block.
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* If _pattern_ === _elt_ returns true or
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* the block returns true for the element,
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* the element is beginning of a chunk.
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*
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* The === and block is called from the first element to the last element
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* of _enum_.
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* The result for the first element is ignored.
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*
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* The result enumerator yields the chunked elements as an array for +each+
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* method.
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* +each+ method can be called as follows.
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* If <code>_pattern_ === _elt_</code> returns <code>true</code> or the block
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* returns <code>true</code> for the element, the element is beginning of a
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* chunk.
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* The <code>===</code> and _block_ is called from the first element to the last
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* element of _enum_. The result for the first element is ignored.
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* The result enumerator yields the chunked elements as an array.
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* So +each+ method can be called as follows:
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*
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* enum.slice_before(pattern).each { |ary| ... }
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* enum.slice_before { |elt| bool }.each { |ary| ... }
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* enum.slice_before(initial_state) { |elt, state| bool }.each { |ary| ... }
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*
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* Other methods of Enumerator class and Enumerable module,
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* Other methods of the Enumerator class and Enumerable module,
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* such as map, etc., are also usable.
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*
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* For example, iteration over ChangeLog entries can be implemented as
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* follows.
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* follows:
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*
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* # iterate over ChangeLog entries.
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* open("ChangeLog") { |f|
@@ -2538,8 +2537,9 @@ slicebefore_i(VALUE yielder, VALUE enumerator, int argc, VALUE *argv)
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* f.slice_before { |line| /\A\S/ === line }.each { |e| pp e }
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* }
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*
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* "svn proplist -R" produces multiline output for each file.
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* They can be chunked as follows:
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*
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* "svn proplist -R" produces multiline output for each file.
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* They can be chunked as follows:
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*
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* IO.popen([{"LC_ALL"=>"C"}, "svn", "proplist", "-R"]) { |f|
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* f.lines.slice_before(/\AProp/).each { |lines| p lines }
@@ -2567,15 +2567,14 @@ slicebefore_i(VALUE yielder, VALUE enumerator, int argc, VALUE *argv)
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*
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* However local variables are not appropriate to maintain state
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* if the result enumerator is used twice or more.
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* In such case, the last state of the 1st +each+ is used in 2nd +each+.
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* _initial_state_ argument can be used to avoid this problem.
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* In such a case, the last state of the 1st +each+ is used in the 2nd +each+.
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* The _initial_state_ argument can be used to avoid this problem.
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* If non-nil value is given as _initial_state_,
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* it is duplicated for each "each" method invocation of the enumerator.
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* it is duplicated for each +each+ method invocation of the enumerator.
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* The duplicated object is passed to 2nd argument of the block for
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* +slice_before+ method.
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*
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* # word wrapping.
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* # this assumes all characters have same width.
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* # Word wrapping. This assumes all characters have same width.
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* def wordwrap(words, maxwidth)
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* # if cols is a local variable, 2nd "each" may start with non-zero cols.
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* words.slice_before(cols: 0) { |w, h|
@@ -2603,8 +2602,8 @@ slicebefore_i(VALUE yielder, VALUE enumerator, int argc, VALUE *argv)
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* # 20
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* # ----------
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*
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* mbox contains series of mails which start with Unix From line.
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* So each mail can be extracted by slice before Unix From line.
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* mbox contains series of mails which start with Unix From line.
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* So each mail can be extracted by slice before Unix From line.
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*
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* # parse mbox
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* open("mbox") { |f|

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