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2015-12-03 22:36:35 +08:00
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source/chapter3/01_About_the_Language_Reference.md
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@ -31,10 +31,10 @@ Swift 语言相对较小，这是由于 Swift 代码中的几乎所有常见类
举个例子，getter-setter 的语法块的定义如下：
> getter-setter 方法块语法
> *getter-setter 方法块* → { [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause) <sub>可选</sub> } | { [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause) [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) }
> *getter-setter 方法块* → { [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause)<sub>可选</sub> } | { [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause) [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) }
这个定义表明，一个 getter-setter 方法块可以由一个 getter 子句后跟一个可选的 setter 子句构成，然后用大括号括起来，或者由一个 setter 子句后跟一个 getter 子句构成，然后用大括号括起来。下面的两个语法产式等价于上述的语法产式，并明确指出了如何取舍：
> getter-setter 方法块语法
> getter-setter 方法块 → { [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause) <sub>可选</sub> }
> getter-setter 方法块 → { [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause)<sub>可选</sub> }
> getter-setter 方法块 → { [*setter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/setter-clause) [*getter 子句*](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html#//apple_ref/swift/grammar/getter-clause) }