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385 строки
13 KiB
Plaintext
# -*- rdoc -*-
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= NEWS for Ruby 2.3.0
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This document is a list of user visible feature changes made between
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releases except for bug fixes.
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Note that each entry is kept so brief that no reason behind or
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reference information is supplied with. For a full list of changes
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with all sufficient information, see the ChangeLog file or Redmine
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(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
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== Changes since the 2.2.0 release
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=== Language changes
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* frozen-string-literal pragma:
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* new pragma, frozen-string-literal has been experimentally introduced. [Feature #8976]
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* besides, --enable/--disable=frozen-string-literal options also have
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been introduced. [Feature #8976]
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* command line options --debug or --debug=frozen-string-literal enable
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additional debugging mode which shows created location with at frozen
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object error (RuntimeError). [Feature #11725]
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* safe navigation operator:
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* new method call syntax, `object&.foo', method #foo is called on
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`object' if it is not nil. [Feature #11537]
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This is similar to `try!' in Active Support, except:
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* method name is syntactically required
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obj.try! {} # valid
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obj&. {} # syntax error
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* arguments are evaluated only if a call is made:
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obj.try!(:foo, bar()) # bar() is always evaluated
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obj&.foo(bar()) # bar() is conditionally evaluated
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* attribute assignment is valid
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obj&.attr += 1
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* the did_you_mean gem:
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* When a NameError or NoMethodError occurs because of a typo in the name,
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the did_you_mean gem automatically suggests other names similar to the
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method name.
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"Yuki".starts_with?("Y")
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# => NoMethodError: undefined method `starts_with?' for "Yuki":String
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# Did you mean? start_with?
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* indented here document:
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* new string literal, here document starts with `<<~`.
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refer doc/syntax/literals.rdoc for more details. [Feature #9098]
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=== Core classes updates (outstanding ones only)
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* ARGF
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* ARGF.read_nonblock supports `exception: false' like IO#read_nonblock. [Feature #11358]
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* Array
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* Array#bsearch_index [Feature #10730]
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* Array#dig [Feature #11643]
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* Comparable
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* Comparable#== no longer rescues exceptions [Feature #7688]
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* Encoding
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* new Encoding::IBM037 (alias ebcdic-cp-us; dummy)
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* Enumerable
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* Enumerable#grep_v is added as inverse version of Enumerable#grep. [Feature #11049]
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* Enumerable#chunk_while [Feature #10769]
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* Enumerator::Lazy
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* Enumerator::Lazy#grep_v [Feature #11773]
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* File
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* File.mkfifo [Feature #11536]
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* Add File::TMPFILE corresponding to O_TMPFILE
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* Hash
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* Hash#fetch_values [Feature #10017]
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* Hash#dig [Feature #11643]
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* Hash#<=, Hash#<, Hash#>=, Hash#> [Feature #10984]
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* Hash#to_proc [Feature #11653]
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* IO
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* new mode flag File::SHARE_DELETE is available.
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this flag means to permit deleting opened file on Windows, but currently
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this affect only files opened as binary. [Feature #11218]
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* new option parameter `flags' is added.
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this parameter is bitwise-ORed to oflags generated by normal mode argument. [Feature #11253]
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* IO#advise no longer raises Errno::ENOSYS in cases where it was
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detected at build time but not available at runtime. [Feature #11806]
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* Kernel
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* Kernel#loop, when stopped by a StopIteration exception, returns
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what the enumerator has returned instead of nil. [Feature #11498]
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* Module
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* Module#deprecate_constant [Feature #11398]
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* NameError
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* NameError#receiver is added to take the receiver object. [Feature #10881]
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* Numeric
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* Numeric#positive? and Numeric#negative? are added, which return
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true when the receiver is positive and negative respectively. [Feature #11151]
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* Proc
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* Proc#call (and also #[], #===, #yield) are optimized.
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Backtrace doesn't show each method (show block lines directly).
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TracePoint also ignores these calls. [Feature #11569]
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* Queue (Thread::Queue)
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* Queue#close is added to notice a termination. [Feature #10600]
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* Regexp/String: Updated Unicode version from 7.0.0 to 8.0.0
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* RubyVM::InstructionSequence
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* add the following methods as a primitive tool of iseq loader.
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See sample/iseq_loader.rb for usage.
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Note that loader does not have verifier so it is easy to cause
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critical problem by loading modified/broken binary data.
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See [Feature #11788] for more details. (experimental feature)
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* RubyVM::InstructionSequence#to_binary(extra_data = nil)
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* RubyVM::InstructionSequence.load_from_binary(binary)
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* RubyVM::InstructionSequence.load_from_binary_extra_data(binary)
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* String
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* String#+@ and String#-@ are added to get mutable/frozen strings. [Feature #11782]
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* String.new now accepts new option parameter `encoding'. [Feature #11785]
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* Struct
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* Struct#dig [Feature #11688]
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* Thread
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* Thread#name, Thread#name= are added to handle thread names [Feature #11251]
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=== Core classes compatibility issues (excluding feature bug fixes)
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* Array
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* Array#select!, Array#keep_if, Array#reject!, and Array#delete_if
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no longer changes the receiver array instantly every time the
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block is called. [Feature #10714]
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* Array#flatten and Array#flatten! no longer try to call #to_ary
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method on elements beyond the given level. [Bug #10748]
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* Array#inspect doesn't raise error even if its content returns
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a string which is not compatible with Encoding.default_external
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as inspected result. [Feature #11801]
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* Enumerable
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* Enumerable#chunk and Enumerable#slice_before no longer takes the
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initial_state argument. [Feature #10958]
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Use a local variable instead to maintain a state.
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* File::Stat
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* On Windows File::Stat#ino always returned 0, but now returns
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BY_HANDLE_FILE_INFORMATION.nFileIndexHigh/Low. [Feature #11216]
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* Hash
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* Hash#inspect doesn't raise error even if its content returns
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a string which is not compatible with Encoding.default_external
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as inspected result. [Feature #11801]
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* IO
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* IO#close doesn't raise when the IO object is closed. [Feature #10718]
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* IO#each_codepoint raises an exception at incomplete character
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before EOF when conversion takes place. [Bug #11444]
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* Module
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* Module#define_method and Object.define_singleton_method now
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require method body, Proc, Method, or a block, and raise
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ArgumentError if no block is given directly. [Bug #11283]
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* pack/unpack (Array/String)
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* j and J directives for pointer width integer type. [Feature #11215]
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=== Stdlib updates (outstanding ones only)
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* Logger
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* Logger#level= now supports symbol and string levels such as :debug, :info,
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:warn, :error, :fatal (case insensitive) [Feature #11695]
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* Logger#reopen is added to reopen a log device. [Feature #11696]
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* io/wait
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* IO#wait_readable no longer checks FIONREAD, it may be used for
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non-bytestream IO such as listen sockets.
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* Net::FTP
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* Net::FTP#mlst is added.
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* Net::FTP#mlsd is added.
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* nkf
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* Merge nkf 2.1.4.
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* ObjectSpace (objspace)
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* ObjectSpace.count_symbols is added.
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* ObjectSpace.count_imemo_objects is added.
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* ObjectSpace.internal_class_of is added.
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* ObjectSpace.internal_super_of is added.
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* OpenSSL
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* OpenSSL::SSL::SSLSocket#accept_nonblock and
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OpenSSL::SSL::SSLSocket#connect_nonblock supports `exception: false`. [Feature #10532]
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* Pathname
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* Pathname#descend and Pathname#ascend supported blockless form. [Feature #11052]
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* Socket
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* Socket#connect_nonblock, Socket#accept_nonblock,
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TCPServer#accept_nonblock, UNIXServer#accept_nonblock,
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BasicSocket#recv_nonblock, BasicSocket#recvmsg_nonblock,
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BasicSocket#sendmsg_nonblock all support `exception: false` to return
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:wait_readable or :wait_writable symbols instead of raising
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IO::WaitReadable or IO::WaitWritable exceptions [Feature #10532] [Feature #11229]
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* BasicSocket#recv and BasicSocket#recv_nonblock allow an output
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String buffer argument like IO#read and IO#read_nonblock to reduce
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GC overhead [Feature #11242]
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* StringIO
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* In read-only mode, StringIO#set_encoding no longer sets the encoding
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of its buffer string. Setting the encoding of the string directly
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without StringIO#set_encoding may cause unpredictable behavior now. [Bug #11827]
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* timeout
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* Object#timeout is now warned as deprecated when called.
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=== Stdlib compatibility issues (excluding feature bug fixes)
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* ext/coverage/coverage.c
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* Coverage.peek_result: new method to allow coverage to be captured without
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stopping the coverage tool. [Feature #10816]
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* Fiddle
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* Fiddle::Function#call releases the GVL. [Feature #11607]
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* io-console
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* Update to io-console 0.4.5, and change the license to BSD 2-clause
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"Simplified" License.
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* lib/base64.rb
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* Base64.urlsafe_encode64: added a "padding" option to suppress
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the padding character ("="). [Feature #10740]
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* Base64.urlsafe_decode64: now it accepts not only correctly-padded
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input but also unpadded input. [Feature #10740]
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* lib/drb/drb.rb
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* removed unused argument. https://github.com/ruby/ruby/pull/515
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* lib/matrix.rb
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* Add Vector#round. https://github.com/ruby/ruby/pull/802
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* lib/webrick/utils.rb
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* removed unused argument. https://github.com/ruby/ruby/pull/356
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* Net::FTP
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* Connections are in passive mode per default now. The default mode can
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be changed by Net::FTP.default_passive=. [Feature #11612]
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* Net::HTTP
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* default value of Net::HTTP#open_timeout is now 60 (was nil).
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* Net::Telnet
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* Net::Telnet is extracted to net-telnet gem. It's unmaintain code. [Feature #11083]
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* Psych
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* Updated to Psych 2.0.17
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* Rake
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* Rake is removed from stdlib. [Feature #11025]
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* RDoc
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* Updated to RDoc 4.2.1. For full release notes see:
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https://github.com/rdoc/rdoc/blob/master/History.rdoc#421--2015-12-22
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* RubyGems
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* Updated to RubyGems 2.5.1. For full release notes see:
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http://docs.seattlerb.org/rubygems/History_txt.html#label-2.5.0+-2F+2015-11-03
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and
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http://docs.seattlerb.org/rubygems/History_txt.html#label-2.5.1+-2F+2015-12-10
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=== Built-in global variables compatibility issues
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* $SAFE
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* $SAFE=2 and $SAFE=3 are obsolete. If $SAFE is set to 2 or larger,
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an ArgumentError is raised. [Feature #5455]
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=== C API updates
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* rb_define_class_id_under() now raises a TypeError exception when the
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class is already defined but its superclass does not match the given
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superclass, as well as definitions in ruby level.
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* rb_timespec_now() is added to fetch current datetime as struct timespec. [Feature #11558]
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* rb_time_timespec_new() is added to create a time object with epoch,
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nanosecond, and UTC/localtime/time offset arguments. [Feature #11558]
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* rb_autoload() deprecated, use rb_funcall() instead. [Feature #11664]
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* rb_compile_error_with_enc(), rb_compile_error(), and rb_compile_bug()
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deprecated. these functions are exposed but only for internal use.
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external libraries should not use them.
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=== Supported platform changes
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* OS/2 is no longer supported
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* BeOS is no longer supported
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* Borland-C is no longer supported
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* Haiku now stable and best effort
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=== Implementation improvements
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* Optimize Proc#call to eliminate method frame construction. [Feature #11569]
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* Reconsidering method entry data structure. [Bug #11278]
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* Introducing new table data structure for ID keys tables used by
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method table and so on. New table structure is simple and fast
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than st_table. [Feature #11420]
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* Machine code level tuning for object allocation and method calling
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code. r52099, r52254
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* RubyVM::InstructionSequence is extended for future improvement. [Feature #11788]
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* Case dispatch is now optimized for all special constant literals
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including nil, true, and false. Previously, only literal strings,
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symbols, integers and floats compiled to optimized case dispatch. [Feature #11769]
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* Instance variables on non-pure Ruby classes (T_DATA, T_FILE,
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etc..) is less expensive to store than before. [Feature #11170]
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* All accesses to members of big Struct objects are performed in
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constant-time. Previously, Struct elements beyond the first 10
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elements used a linear scan. [Feature #10585]
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* The Set class got several speed up. [Misc #10754], [r52591]
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* Socket and I/O-related improvements
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* Calling overhead of most of new keyword-using I/O methods in
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[Feature #11229] is reduced by avoiding the inefficient C API
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to parse keywords. [Feature #11339]
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* The standard library is updated to use the improved
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exception-free non-blocking I/O from [Feature #11229].
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This has the additional benefit of quieter $DEBUG output in
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addition to reducing expensive exceptions. [Feature #11044]
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* (Linux-only) waiting on a single FD anywhere in the stdlib no longer
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uses select(2), making it immune to slowdowns with high-numbered
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FDs. [Feature #11081] [Feature #11377]
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* CGI.escapeHTML is optimized with C extension.
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https://github.com/ruby/ruby/pull/1164
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