Unicode Type

The unicode type is a representation of Unicode (arguably ISO10646) code points. In practice they are much like an integer ranging from 0 to 0x10FFFF although they do not overlap or have any direct interaction with integers, they are a separate type.

Reader Forms

The canonical reader form is #U+HHHH where the number of hex digits, H, is “enough.” Leading zeroes are not required, #U+127 is the same as #U+0127.

An alternate reader form is #\x where x is the UTF-8 representation of the code point – for example, #\ħ would be read as U+0127 (LATIN SMALL LETTER H WITH STROKE). Clearly, the usefulness of this form is dependent on general support by fonts and editors.

A final reader form is for a limited number of named characters, say, #\{newline}, with the name in braces. We could, but we don’t, use the Unicode Character Database names, say, #\{LATIN SMALL LETTER H WITH STROKE}.

Instead the set of names is limited to:

name

code point

C escape sequence

nul

U+0000

soh

U+0001

stx

U+0002

etx

U+0003

eot

U+0004

enq

U+0005

ack

U+0006

bel

U+0007

\a

bs

U+0008

\b

ht

U+0009

\t

lf

U+000A

\n

vt

U+000B

\v

ff

U+000C

\f

cr

U+000D

\r

so

U+000E

si

U+000F

dle

U+0010

dcl

U+0011

dc2

U+0012

dc3

U+0013

dc4

U+0014

nak

U+0015

syn

U+0016

etb

U+0017

can

U+0018

em

U+0019

sub

U+001A

esc

U+001B

fs

U+001C

gs

U+001D

rs

U+001E

us

U+001F

sp

U+0020

alarm

U+0007

\a

backspace

U+0008

\b

tab

U+0009

\t

linefeed

U+000A

\n

newline

U+000A

\n

vtab

U+000B

\v

page

U+000C

\f

return

U+000D

\r

carriage-return

U+000D

\r

esc

U+001B

escape

U+001B

space

U+0020

del

U+007F

delete

U+007F

lbrace

U+007B

{

U+007B

Unicode Predicates

function unicode? o

test if o is a unicode value

Param o:

object to test

Return:

#t if o is a unicode value, #f otherwise

Unicode Constructors

function integer->unicode i

convert integer i to a Unicode code point

Param i:

number

Type i:

integer

Return:

Unicode code point

Rtype:

unicode

Unicode Functions

function unicode=? cp1 cp2 [...]

test if unicode arguments are equal

Param cp1:

unicode

Param cp2:

unicode

Param …:

unicode

Return:

#t if arguments are equal, #f otherwise

Last built at 2024-05-17T06:10:59Z+0000 from 62cca4c (dev) for Idio 0.3.b.6