The abstract type of documents. A Doc represents a *set* of layouts. A Doc with no occurrences of Union or NoDoc represents just one layout.

The TextDetails data type

A TextDetails represents a fragment of text that will be output at some point.

A document of height and width 1, containing a literal character.

A document of height 1 containing a literal string. text satisfies the following laws:

• text s <> text t = text (s++t)

• text "" <> x = x, if x non-empty

The side condition on the last law is necessary because text "" has height 1, while empty has no height.

Same as text. Used to be used for Bytestrings.

Some text with any width. (text s = sizedText (length s) s)

Some text, but without any width. Use for non-printing text such as a HTML or Latex tags

The empty document, with no height and no width. empty is the identity for <>, <+>, $$ and $+$, and anywhere in the argument list for sep, hcat, hsep, vcat, fcat etc.

Beside. <> is associative, with identity empty.

Beside, separated by space, unless one of the arguments is empty. <+> is associative, with identity empty.

List version of <>.

List version of <+>.

Above, except that if the last line of the first argument stops at least one position before the first line of the second begins, these two lines are overlapped. For example:

    text "hi" $$ nest 5 (text "there")

lays out as

    hi   there

rather than

    hi
         there

$$ is associative, with identity empty, and also satisfies

• (x $$ y) <> z = x $$ (y <> z), if y non-empty.

Above, with no overlapping. $+$ is associative, with identity empty.

List version of $$.

Either hsep or vcat.

Either hcat or vcat.

"Paragraph fill" version of sep.

"Paragraph fill" version of cat.

Nest (or indent) a document by a given number of positions (which may also be negative). nest satisfies the laws:

• nest 0 x = x

• nest k (nest k' x) = nest (k+k') x

• nest k (x <> y) = nest k z <> nest k y

• nest k (x $$ y) = nest k x $$ nest k y

• nest k empty = empty

• x <> nest k y = x <> y, if x non-empty

The side condition on the last law is needed because empty is a left identity for <>.

hang d1 n d2 = sep [d1, nest n d2]

punctuate p [d1, ... dn] = [d1 <> p, d2 <> p, ... dn-1 <> p, dn]

Returns True if the document is empty

first returns its first argument if it is non-empty, otherwise its second.

Perform some simplification of a built up GDoc.

Render the Doc to a String using the default Style.

A rendering style.

The default style (mode=PageMode, lineLength=100, ribbonsPerLine=1.5).

Render the Doc to a String using the given Style.

Rendering mode.

The general rendering interface.