suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Minor pickinesses.

Browse Source
This commit is contained in:
Eli Barzilay 2012-10-15 15:03:53 -04:00
parent 7ffe9f2612
commit d67396cbb1
1 changed files with 39 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
collects/scribblings/reference/string-ports.scrbl
View File

@ -7,11 +7,12 @@
@title[#:tag "stringport"]{String Ports}
A @deftech{string port} reads or writes from a @tech{byte string}. An
input @tech{string port} can be created from either a @tech{byte string} or a
@tech{string}; in the latter case, the @tech{string} is effectively converted to
a @tech{byte string} using @racket[string->bytes/utf-8]. An output @tech{string port}
collects output into a @tech{byte string}, but @racket[get-output-string]
conveniently converts the accumulated bytes to a @tech{string}.
input @tech{string port} can be created from either a @tech{byte string}
or a @tech{string}; in the latter case, the @tech{string} is effectively
converted to a @tech{byte string} using @racket[string->bytes/utf-8]. An
output @tech{string port} collects output into a @tech{byte string}, but
@racket[get-output-string] conveniently converts the accumulated bytes
to a @tech{string}.
Input and output @tech{string ports} do not need to be explicitly
closed. The @racket[file-position] procedure works for @tech{string
@ -21,31 +22,30 @@ ports} in position-setting mode.
@defproc[(open-input-bytes [bstr bytes?] [name any/c 'string]) input-port?]{
Creates an input @tech{string port} that reads characters from @racket[bstr] (see
@secref["bytestrings"]). Modifying @racket[bstr] afterward does not
affect the byte stream produced by the port. The optional
@racket[name] argument is used as the name for the returned port.}
Creates an input @tech{string port} that reads characters from
@racket[bstr] (see @secref["bytestrings"]). Modifying @racket[bstr]
afterward does not affect the byte stream produced by the port. The
optional @racket[name] argument is used as the name for the returned
port.}
@examples[
#:eval sp-eval
@examples[#:eval sp-eval
(define sp (open-input-bytes #"(apples 42 day)"))
(define sexp1 (read sp))
(first sexp1)
(rest sexp1)
(define sp (open-input-bytes #"the cow jumped over the moon\nthe little dog\n"))
(read-line sp)
(read-line (open-input-bytes
#"the cow jumped over the moon\nthe little dog\n"))
]
@refalso["strings"]{strings}
@defproc[(open-input-string [str string?] [name any/c 'string]) input-port?]{
Creates an input @tech{string port} that reads bytes from the UTF-8 encoding (see
@secref["encodings"]) of @racket[str]. The optional @racket[name]
argument is used as the name for the returned port.}
Creates an input @tech{string port} that reads bytes from the UTF-8
encoding (see @secref["encodings"]) of @racket[str]. The optional
@racket[name] argument is used as the name for the returned port.}
@examples[
#:eval sp-eval
@examples[#:eval sp-eval
(define sp (open-input-string "(λ (x) x)"))
(read sp)
(define names (open-input-string "Günter Harder\nFrédéric Paulin\n"))
@ -54,8 +54,8 @@ argument is used as the name for the returned port.}
@defproc[(open-output-bytes [name any/c 'string]) output-port?]{
Creates an output @tech{string port} that accumulates the output into a byte
string. The optional @racket[name] argument is used as the name for
Creates an output @tech{string port} that accumulates the output into a
byte string. The optional @racket[name] argument is used as the name for
the returned port.}
@examples[ #:eval sp-eval
@ -95,13 +95,13 @@ same as @racket[open-output-bytes].}
[end-pos exact-nonnegative-integer? #f])
bytes?]{
Returns the bytes accumulated in the @tech{string port} @racket[out] so far in a
freshly allocated @tech{byte string} (including any bytes written after the
port's current position, if any). The @racket[out] port must be an
output @tech{string port} produced by @racket[open-output-bytes] (or
@racket[open-output-string]) or a structure whose
@racket[prop:output-port] property refers to such an output port
(transitively).
Returns the bytes accumulated in the @tech{string port} @racket[out] so
far in a freshly allocated @tech{byte string} (including any bytes
written after the port's current position, if any). The @racket[out]
port must be an output @tech{string port} produced by
@racket[open-output-bytes] (or @racket[open-output-string]) or a
structure whose @racket[prop:output-port] property refers to such an
output port (transitively).
If @racket[reset?] is true, then all bytes are removed from the port,
and the port's position is reset to @racket[0]; if @racket[reset?] is