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doc clarification on readtable procedures

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Matthew Flatt 2013-01-23 11:56:14 -05:00
parent 9e0fce224b
commit 21c8ef6e91
1 changed files with 9 additions and 7 deletions
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16
collects/scribblings/reference/readtables.scrbl
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@ -108,7 +108,7 @@ The possible combinations for @racket[key], @racket[mode], and
@item{@racket[(code:line _char (unsyntax @indexed-racket['dispatch-macro]) _proc)] --- like the
@racket['non-terminating-macro] variant, but for @racket[_char] only
when it follows a @litchar{#} (or, more precisely, when the character
follows one that has been mapped to the behavior of @litchar{#}hash
follows one that has been mapped to the behavior of @litchar{#}
in the default readtable).}
@item{@racket[(code:line _char _like-char _readtable)] --- causes
@ -144,12 +144,14 @@ optionally accept two arguments. The first two arguments are always
the character that triggered the reader macro and the input port for
reading. When the reader macro is triggered by @racket[read-syntax]
(or @racket[read-syntax/recursive]), the procedure is passed four
additional arguments that represent a source location. When the reader
macro is triggered by @racket[read] (or @racket[read/recursive]), the
procedure is passed only two arguments if it accepts two arguments,
otherwise it is passed six arguments where the last four are all
@racket[#f]. See @secref["reader-procs"] for information on the
procedure's results.
additional arguments that represent a source location for
already-consumed character(s): the source name, a line number or
@racket[#f], a column number or @racket[#f], and a position or
@racket[#f]. When the reader macro is triggered by @racket[read] (or
@racket[read/recursive]), the procedure is passed only two arguments
if it accepts two arguments, otherwise it is passed six arguments
where the last four are all @racket[#f]. See @secref["reader-procs"]
for information on the procedure's results.
A reader macro normally reads characters from the given input port to
produce a value to be used as the ``reader macro-expansion'' of the