Unicode Chars🔗 i

John Clements <clements@racket-lang.org>

(require unicode )

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.

1Built-in properties🔗 i

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.

2Auto Update🔗 i

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".

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