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Re: Character literals for Unicode (control) characters

From: Philipp Stephani
Subject: Re: Character literals for Unicode (control) characters
Date: Sun, 06 Mar 2016 17:35:18 +0000

Eli Zaretskii <address@hidden> schrieb am So., 6. März 2016 um 16:54 Uhr:
> From: Philipp Stephani <address@hidden>
> Date: Sun, 06 Mar 2016 15:24:47 +0000
> I've attached a patch with an initial implementation.


> +/* Hash table that maps Unicode character names to code points.  */
> +static Lisp_Object character_names;
> +
> +/* Length of the longest Unicode character name, in bytes. */
> +static ptrdiff_t max_character_name_length;
> +
> +/* Initializes `character_names' and `max_character_name_length'.
> +   Called by `read_escape'.  */

I wonder if there's a better way, in particular with a smaller memory
footprint.  Doesn't map-char-table work well enough to avoid
generating all the names up front?

It doesn't seem to work; for some reason the Unicode name table appears very small (only 136 code points) when map-char-table is called from C and lacks most characters.

> +        if (! RANGED_INTEGERP (0, code, 0x10FFFF))

This should use MAX_UNICODE_CHAR.

Done, attached a new patch. 

Attachment: 0001-Implement-named-character-escapes-similar-to-Perl.patch
Description: Binary data

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