8.13.0.2
Unicode Chars
This package provides definitions for several unicode character
properties defined by Unicode Technical Report #44,
Unicode Character Database.
Currently, it includes three properties: XID_Start, XID_Continue, and Bidi_Mirrored.
In addition to these, though, it is built upon an auto-extraction mechanism that can
download and update the given properties or any other binary property from the canonical
unicode sources.
1 Built-in properties
The following three properties are built-in. Of course, it’s easy to change this set....
procedure
(bidi-mirrored? codepoint) → boolean?
codepoint : exact-nonnegative-integer?
given a number representing a unicode code point, return true when this code point
has the "Bidi_Mirrored" property.
procedure
(xid-start? codepoint) → boolean?
codepoint : exact-nonnegative-integer?
given a number representing a unicode code point, return true when this code point
has the "XID_Start" property.
procedure
(xid-continue? codepoint) → boolean?
codepoint : exact-nonnegative-integer?
given a number representing a unicode code point, return true when this code point
has the "XID_Continue" property.
2 Auto Update
This package contains code that automatically downloads and extracts updated versions of these (or other) properties from the canonical database.
In order to run this auto-update, evaluate the file "compute-prop.rkt". In order to change the set of properties that is automatically derived, edit the definition of prop-files contained in "compute-prop.rkt".