haskell - 如何在 Haskell 中编写多行字符串？

Question

假设我有这个带有换行符的字符串文字:

file :: String
file = "the first line\nthe second line\nthe third line"

有没有办法这样写？

file :: String
file = "the first line
        the second line
        the third line"

上面的尝试会导致此错误:

factor.hs:58:33:
    lexical error in string/character literal at character '\n'
Failed, modules loaded: none.

Answer 1

你可以像这样编写多行字符串

x = "This is some text which we escape \
      \   and unescape to keep writing"

打印为

"This is some text which we escape   and unescape to keep writing"

如果您希望将其打印为两行

x = "This is some text which we escape \n\
      \   and unescape to keep writing"

打印为

This is some text which we escape
    and unescape to keep writing