- <+> puts its arguments beside each other with a space between them,
- unless either argument is empty in which case it returns the other
-
-
- hcat is a list version of <>
- hsep is a list version of <+>
- vcat is a list version of $$
-
- sep (separate) is either like hsep or like vcat, depending on what fits
-
- cat is behaves like sep, but it uses <> for horizontal conposition
- fcat is behaves like fsep, but it uses <> for horizontal conposition
-
- These new ones do the obvious things:
- char, semi, comma, colon, space,
- parens, brackets, braces,
- quotes, doubleQuotes
-
-4. The "above" combinator, $$, now overlaps its two arguments if the
- last line of the top argument stops before the first line of the second begins.
- For example: text "hi" $$ nest 5 "there"
- lays out as
- hi there
- rather than
- hi
- there
-
- There are two places this is really useful
-
- a) When making labelled blocks, like this:
- Left -> code for left
- Right -> code for right
- LongLongLongLabel ->
- code for longlonglonglabel
- The block is on the same line as the label if the label is
- short, but on the next line otherwise.
-
- b) When laying out lists like this:
- [ first
- , second
- , third
- ]
- which some people like. But if the list fits on one line
- you want [first, second, third]. You can't do this with
- John's original combinators, but it's quite easy with the
- new $$.
-
- The combinator $+$ gives the original "never-overlap" behaviour.
-
-5. Several different renderers are provided:
- * a standard one
- * one that uses cut-marks to avoid deeply-nested documents
- simply piling up in the right-hand margin
- * one that ignores indentation (fewer chars output; good for machines)
- * one that ignores indentation and newlines (ditto, only more so)
-
-6. Numerous implementation tidy-ups
- Use of unboxed data types to speed up the implementation
+ <+> puts its arguments beside each other with a space between them,
+ unless either argument is empty in which case it returns the other
+
+
+ hcat is a list version of <>
+ hsep is a list version of <+>
+ vcat is a list version of $$
+
+ sep (separate) is either like hsep or like vcat, depending on what fits
+
+ cat is behaves like sep, but it uses <> for horizontal conposition
+ fcat is behaves like fsep, but it uses <> for horizontal conposition
+
+ These new ones do the obvious things:
+ char, semi, comma, colon, space,
+ parens, brackets, braces,
+ quotes, doubleQuotes
+
+4. The "above" combinator, $$, now overlaps its two arguments if the
+ last line of the top argument stops before the first line of the second begins.
+ For example: text "hi" $$ nest 5 "there"
+ lays out as
+ hi there
+ rather than
+ hi
+ there
+
+ There are two places this is really useful
+
+ a) When making labelled blocks, like this:
+ Left -> code for left
+ Right -> code for right
+ LongLongLongLabel ->
+ code for longlonglonglabel
+ The block is on the same line as the label if the label is
+ short, but on the next line otherwise.
+
+ b) When laying out lists like this:
+ [ first
+ , second
+ , third
+ ]
+ which some people like. But if the list fits on one line
+ you want [first, second, third]. You can't do this with
+ John's original combinators, but it's quite easy with the
+ new $$.
+
+ The combinator $+$ gives the original "never-overlap" behaviour.
+
+5. Several different renderers are provided:
+ * a standard one
+ * one that uses cut-marks to avoid deeply-nested documents
+ simply piling up in the right-hand margin
+ * one that ignores indentation (fewer chars output; good for machines)
+ * one that ignores indentation and newlines (ditto, only more so)
+
+6. Numerous implementation tidy-ups
+ Use of unboxed data types to speed up the implementation
projects / ghc-hetmet.git / commitdiff