用于每个包含那个指令逻辑的样式表类型的类。
A class for each style sheet instruction type that contains the logic for that instruction.
你也可以把模式匹配想象成你最喜欢的c类语言的case指令，当然是打了激素的。
Pattern matching is the familiar case statement from your favorite C-like language, but on steroids.
你也可以把模式匹配想象成你最喜欢的c类语言的case指令，当然是打了激素的。
Pattern matching is the familiar case statement from your favorite C-like language, but on steroids.
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