发布于 2015-09-21 01:22:14 | 175 次阅读 | 评论: 0 | 来源: 网友投递
Crystal 编译型的编程语言
Crystal 是一个编译型的编程语言。
Crystal 0.8.0 发布，此版本主要改进：枚举定义问题方法；大大改进调试器支持；shards 成为官方依赖安装方法等等。
更新内容如下：
(breaking change) Renamed a couple of types: ChannelClosed -> Channel::ClosedError,UnbufferedChannel -> Channel::Unbuffered, BufferedChannel -> Channel::Buffered,DayOfWeek -> Time::DayOfWeek, MonthSpan -> Time::MonthSpan, TimeSpan -> Time::Span,TimeFormat -> Time::Format, EmptyEnumerable -> Enumerable::EmptyError, SocketError -> Socket::Error,MatchData -> Regex::MatchData, SignedInt -> Int::Signed, UnsignedInt -> Int::Unsigned,FileDescriptorIO -> IO::FileDescriptor, BufferedIO -> IO::Buffered, CharReader -> Char::Reader,PointerAppender -> Pointer::Appender.
(breaking change) All places that raised DomainError raise ArgumentError now.
(breaking change) Renamed Type.cast to Type.new (for example, Int32.new instead of Int32.cast)
(breaking change) Removed all macro instance variables except @type
(breaking change) Removed undef
(breaking change) Removed length() and count() methods from collections. The only method for this is now size.
(breaking change) Removed the ability to invoke methods on a union class
Improved debugger support
crystal deps now delegates to shards. Removed Projecfile support.
Automatically convert numeric types when invoking C functions
Automatically define questions methods for enum members
Support quotes inside quoted symbols (thanks @wolflee)
Allow marking initialize as private
Added method_added macro hook (thanks @MakeNowJust)
Added ArrayLiteral#includes?(obj) in macros
Added ASTNode#symbolize in macros (thanks @kirbyfan64)
Added experimental yaml_mapping
Added nilable variants to Enumerable#max, Enumerable#min, and others (thanks @technorama)
Added Iterator#flatten (thanks @jpellerin)
Added setting a read timeout to HTTP::Client (thanks @benoist)
Added Array#delete_at(index, count) and Array#delete_at(range) (thanks @tebakane)
Added HTTP::Cookies (thanks @netfeed)
Added Tuple#reverse (thanks @jhass)
Added Number#clamp (thanks @technorama)
Added serveral socket options (thanks @technorama)
Added WebSocket.open (thanks @kumpelblase2)
Added Enum.flags macro
Added support for sending chunked content in HTTP server (thanks @bcardiff)
Added future, lazy and delay concurrency methods (thanks @technorama)
fork now returns a Process (thanks @technorama)
Documented Set, and added a couple of methods (thanks @will)
Nicer formatting in Benchmark.ips, and interactive mode (thanks @will)
The -f format output is now honored in compiler errors (thanks @kirbyfan64)
Fixed an ambiguity with the crystal build command (thanks @MakeNowJust)
Cast exceptions now raise TypeCastError instead of Exception (thanks @will)
Many bugs fixes
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Crystal 是一个编译型的编程语言。特性：
语法类似 Ruby Ruby-inspired syntax.
无需指定变量类型和方法参数类型 Never have to specify the type of a variable or method argument.
可以调用 C 代码 Be able to call C code by writing bindings to it in Crystal.
编译时代码模拟和生成 Have compile-time evaluation and generation of code, to avoid boilerplate code.
编译成高效的本机代码 Compile to efficient native code.