Documentation

Fields

• outputOptionsIndentAmount :: Int

  Number of spaces to use when indenting. It should probably be either 2 or 4.

• outputOptionsPageWidth :: Int

  The maximum number of characters to fit on to one line.

• outputOptionsCompact :: Bool

  Use less vertical (and more horizontal) space.

• outputOptionsCompactParens :: Bool

  Group closing parentheses on to a single line.

• outputOptionsInitialIndent :: Int

  Indent the whole output by this amount.

• outputOptionsColorOptions :: Maybe ColorOptions

  If this is Nothing, then don't colorize the output. If this is Just colorOptions, then use colorOptions to colorize the output.

• outputOptionsStringStyle :: StringOutputStyle

  Controls how string literals are output.

  By default, the pPrint functions escape non-printable characters, but print all printable characters:

  >>> pPrintString "\"A \\x42 Ä \\xC4 \\x1 \\n\""
  "A B Ä Ä \x1
  "
  

  Here, you can see that the character A has been printed as-is. x42 has been printed in the non-escaped version, B. The non-printable character x1 has been printed as x1. Newlines will be removed to make the output easier to read.

  This corresponds to the StringOutputStyle called EscapeNonPrintable.

  (Note that in the above and following examples, the characters have to be double-escaped, which makes it somewhat confusing...)

  Another output style is DoNotEscapeNonPrintable. This is similar to EscapeNonPrintable, except that non-printable characters get printed out literally to the screen.

  >>> pPrintStringOpt CheckColorTty defaultOutputOptionsDarkBg{ outputOptionsStringStyle = DoNotEscapeNonPrintable } "\"A \\x42 Ä \\xC4 \\n\""
  "A B Ä Ä
  "
  

  If you change the above example to contain x1, you can see that it is output as a literal, non-escaped character. Newlines are still removed for readability.

  Another output style is Literal. This just outputs all escape characters.

  >>> pPrintStringOpt CheckColorTty defaultOutputOptionsDarkBg{ outputOptionsStringStyle = Literal } "\"A \\x42 Ä \\xC4 \\x1 \\n\""
  "A \x42 Ä \xC4 \x1 \n"
  

  You can see that all the escape characters get output literally, including newline.

Fields

• tapeLeft :: Stream a

  the side of the Tape left of tapeHead

• tapeHead :: a

  the focused element

• tapeRight :: Stream a

  the side of the Tape right of tapeHead