Scala 中的换行符
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Line continuation character in Scala
提问by opensas
I want to split the following Scala code line like this:
我想像这样拆分以下 Scala 代码行：
ConditionParser.parseSingleCondition("field=*value1*").description
must equalTo("field should contain value1")
But which is the line continuation character?
但哪个是行继续符？
回答by kiritsuku
Wrap it in parentheses:
用括号括起来：
(ConditionParser.parseSingleCondition("field=*value1*").description
must equalTo("field should contain value1"))
Scala does not have a "line continuation character" - it infers a semicolon always when:
Scala 没有“行继续符”——它总是在以下情况下推断分号：
- An expression can end
- The following (not whitespace) line begins not with a token that can start a statement
- There are no unclosed
(or[found before
- 一个表达式可以结束
- 以下（非空白）行不以可以开始语句的标记开头
- 之前没有未关闭
(或[发现的
Thus, to "delay" semicolon inference one can place a method call or the dot at the end of the line or place the dot at the beginning of the following line:
因此，要“延迟”分号推断，可以将方法调用或点放在行尾或将点放在下一行的开头：
ConditionParser.
parseSingleCondition("field=*value1*").
description must equalTo("field should contain value1")
a +
b +
c
List(1,2,3)
.map(_+1)
