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update read-cdot documentation

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This commit is contained in:
AlexKnauth 2016-09-01 09:18:12 -04:00
parent f1906d572f
commit 17db8e57f0
1 changed files with 13 additions and 7 deletions
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20
pkgs/racket-doc/scribblings/reference/reader.scrbl
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@ -955,13 +955,19 @@ equivalent prefix as discussed in @secref["parse-number"]. If these
numbers are followed by a @litchar{.} intended to be read as a C-style
infix dot, then there must be separating whitespace.
Finally, after reading any value, @racket[_x], the reader will seek
over whitespace until it reaches a non-whitespace character. If the
character is not @litchar{.}, then the value, @racket[_x], is returned
as usual. If the character is @litchar{.}, then another value,
@racket[_y], is read and the result @racket[(list '#%dot _x _y)] is
returned. In @racket[read-syntax] mode, the @racket['#%dot] symbol has
the source location information of the @litchar{.} character and the
Finally, after reading any datum @racket[_x], the reader will seek
through whitespace and look for zero or more sequences of a
@litchar{.} followed by another datum @racket[_y]. It will then group
@racket[_x] and @racket[_y] together in a @racket[#%dot] form so that
@racket[_x.y] reads equal to @racket[(#%dot _x _y)].
If @racket[_x.y] has another @litchar{.} after it, the reader will
accumulate more @litchar{.}-separated datums, grouping them from
left-to-right. For example, @racket[_x.y.z] reads equal to
@racket[(#%dot (#%dot _x _y) _z)].
In @racket[read-syntax] mode, the @racket[#%dot] symbol has the
source location information of the @litchar{.} character and the
entire list has the source location information spanning from the
start of @racket[_x] to the end of @racket[_y].