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Ascii
ascii
Ascii-Str
empty-ascii-str
ascii-str-concat
ascii-str-length
meta-ascii->ascii
meta-string->ascii-str
ascii-datum
ascii->meta-ascii
ascii-str->meta-string
7.4

3.9 ASCII

This library defines ASCII characters and strings, and a #%datum extension for ASCII string literals.

0 parameter type

Ascii : Type

constructor

ascii : (-> Bool Bool Bool Bool Bool Bool Bool Ascii)

A datatype representing an ASCII character, as a bit vector.

Examples:
> (define zero (ascii false false false false false false false))
> (define one (ascii false false false false false false true))
> ""

(nil (Ascii))

> "1"

(cons (Ascii) (ascii (false) (true) (true) (false) (false) (false) (true)) (nil (Ascii)))

type

Ascii-Str : Type

The type of ASCII string; equivalent to (List Ascii).

The empty string; equivalent to (nil Ascii) and "".

procedure

(ascii-str-concat str1 str2)  Ascii-Str

  str1 : Ascii-Str
  str2 : Ascii-Str
Concatenates two strings, appending str2 to the end of str1.

procedure

(ascii-str-length str)  Nat

  str : Ascii-Str
Returns the length of the string str.

procedure

(meta-ascii->ascii syn char)  syntax?

  syn : (or/c syntax? #f)
  char : ascii-char?
A meta-procedure, provided at phase 1, for converting a Racket (meta-level) ascii-char? into syntax representing an Ascii. If syn is provided, it is used in error messages in the even that char is not an ascii-char?.

procedure

(meta-string->ascii-str syn str)  syntax?

  syn : (or/c syntax? #f)
  str : ascii-string?
A meta-procedure, provided at phase 1, for converting a Racket (meta-level) ascii-string? into syntax representing an Ascii-Str. If syn is provided, it is used in error messages in the even that str is not an ascii-string?.

procedure

(ascii-datum syn f)  syntax?

  syn : syntax?
  f : procedure?
A meta-procedure, provided at phase 1, for parsing ASCII string literals. This module automatically updates #%datum using this procedure.

Examples:
> ""

(nil (Ascii))

> "1"

(cons (Ascii) (ascii (false) (true) (true) (false) (false) (false) (true)) (nil (Ascii)))

procedure

(ascii->meta-ascii syn)  ascii-char?

  syn : syntax?
A meta-procedure, provided at phase 1, for converting syntax representing a Ascii literal into a Racket (meta-level) ascii-char?.

procedure

(ascii-str->meta-string syn)  ascii-string?

  syn : syntax?
A meta-procedure, provided at phase 1, for converting syntax representing a Ascii-Str literal into a Racket (meta-level) ascii-string?.