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Re: [PATCH] Unicode Lisp reader escapes
From: |
Oliver Scholz |
Subject: |
Re: [PATCH] Unicode Lisp reader escapes |
Date: |
Fri, 05 May 2006 19:23:36 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
For what it's worth, I just tried the attached little stress test on
an updated C port of `decode-char' in order to check whether it
returns equivalent results. It does. (Well, except intentional
differences like that `ucs_to_internal' throws an error where
`decode-char' returns nil.)
Basically the test runs through all positive integers up to MAX_CHAR
and inserts an alist into a temp buffer with each car being the
integer and each cdr being a character in the \u syntax (e.g.
`?\u3b1'). It then reads that alist again and checks whether
`decode-char' on its car is `eq' to its cdr. I tried it with and
without `utf-translate-cjk-mode' and with and without
`utf-fragment-on-decoding'. Since all tests succeed, ucs_to_internal
and `decode-char' are functionally equivalent on all supported
characters.
The test:
ucs-test.el
Description: application/emacs-lisp
The updated patch:
Index: src/lread.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/lread.c,v
retrieving revision 1.350
diff -u -r1.350 lread.c
--- src/lread.c 27 Feb 2006 02:04:35 -0000 1.350
+++ src/lread.c 5 May 2006 17:09:37 -0000
@@ -87,6 +87,9 @@
Lisp_Object Qbackquote, Qcomma, Qcomma_at, Qcomma_dot, Qfunction;
Lisp_Object Qinhibit_file_name_operation;
Lisp_Object Qeval_buffer_list, Veval_buffer_list;
+Lisp_Object Qutf_translate_cjk_mode, Qutf_translate_cjk_lang_env,
Qutf_translate_cjk_load_tables;
+Lisp_Object Qutf_subst_table_for_decode, Qtranslation_hash_table;
+Lisp_Object Qutf_translation_table_for_decode, Qtranslation_table;
extern Lisp_Object Qevent_symbol_element_mask;
extern Lisp_Object Qfile_exists_p;
@@ -1731,6 +1734,110 @@
return str[0];
}
+
+#define READ_HEX_ESCAPE(i, c) \
+ while (1) \
+ { \
+ c = READCHAR; \
+ if (c >= '0' && c <= '9') \
+ { \
+ i *= 16; \
+ i += c - '0'; \
+ } \
+ else if ((c >= 'a' && c <= 'f') \
+ || (c >= 'A' && c <= 'F')) \
+ { \
+ i *= 16; \
+ if (c >= 'a' && c <= 'f') \
+ i += c - 'a' + 10; \
+ else \
+ i += c - 'A' + 10; \
+ } \
+ else \
+ { \
+ UNREAD (c); \
+ break; \
+ } \
+ }
+
+
+
+/* Return the internal character coresponding to an UCS code point.*/
+
+int
+ucs_to_internal (ucs)
+ int ucs;
+{
+ int c = 0;
+ Lisp_Object tmp_char;
+
+ if (! EQ (Qnil, SYMBOL_VALUE (Qutf_translate_cjk_mode)))
+ /* cf. `utf-lookup-subst-table-for-decode' */
+ {
+ Lisp_Object hash;
+
+ if (EQ (Qnil, SYMBOL_VALUE (Qutf_translate_cjk_lang_env)))
+ call0 (Qutf_translate_cjk_load_tables);
+
+ hash = Fget (Qutf_subst_table_for_decode, Qtranslation_hash_table);
+
+ if (HASH_TABLE_P (hash))
+ {
+ tmp_char = Fgethash (make_number (ucs), hash, Qnil);
+ if (! EQ (Qnil, tmp_char))
+ {
+ CHECK_NUMBER (tmp_char);
+ c = XFASTINT (tmp_char);
+ }
+ }
+ }
+
+ if (c)
+ /* We found the character already in the translation hash table.
+ Do nothing. */
+ ;
+ else if (ucs < 160)
+ c = ucs;
+ else if (ucs < 256)
+ c = MAKE_CHAR (charset_latin_iso8859_1, ucs, 0);
+ else if (ucs < 0x2500)
+ {
+ ucs -= 0x0100;
+ c = MAKE_CHAR (charset_mule_unicode_0100_24ff,
+ ((ucs / 96) + 32),
+ ((ucs % 96) + 32));
+ }
+ else if (ucs < 0x3400)
+ {
+ ucs -= 0x2500;
+ c = MAKE_CHAR (charset_mule_unicode_2500_33ff,
+ ((ucs / 96) + 32),
+ ((ucs % 96) + 32));
+ }
+ else if ((ucs >= 0xE000) && (ucs < 0x10000))
+ {
+ ucs -= 0xE000;
+ c = MAKE_CHAR (charset_mule_unicode_e000_ffff,
+ ((ucs / 96) + 32),
+ ((ucs % 96) + 32));
+ }
+
+ if (c || ucs == 0) /* U+0000 is also a valid character. */
+ {
+ Lisp_Object vect = Fget (Qutf_translation_table_for_decode,
+ Qtranslation_table);
+ if (CHAR_TABLE_P (vect))
+ {
+ tmp_char = Faref (vect, make_number (c));
+ if (! EQ (Qnil, tmp_char))
+ return XFASTINT (tmp_char);
+ }
+ return c;
+ }
+ else error ("Invalid or unsupported UCS character: %x", ucs);
+}
+
+
/* Read a \-escape sequence, assuming we already read the `\'.
If the escape sequence forces unibyte, store 1 into *BYTEREP.
If the escape sequence forces multibyte, store 2 into *BYTEREP.
@@ -1879,34 +1986,23 @@
/* A hex escape, as in ANSI C. */
{
int i = 0;
- while (1)
- {
- c = READCHAR;
- if (c >= '0' && c <= '9')
- {
- i *= 16;
- i += c - '0';
- }
- else if ((c >= 'a' && c <= 'f')
- || (c >= 'A' && c <= 'F'))
- {
- i *= 16;
- if (c >= 'a' && c <= 'f')
- i += c - 'a' + 10;
- else
- i += c - 'A' + 10;
- }
- else
- {
- UNREAD (c);
- break;
- }
- }
-
+ READ_HEX_ESCAPE (i, c);
*byterep = 2;
return i;
}
+ case 'u':
+ /* A hexadecimal reference to an UCS character. */
+ {
+ int i = 0;
+
+ READ_HEX_ESCAPE (i, c);
+ *byterep = 2;
+
+ return ucs_to_internal (i);
+
+ }
+
default:
if (BASE_LEADING_CODE_P (c))
c = read_multibyte (c, readcharfun);
@@ -4121,6 +4217,27 @@
Vloads_in_progress = Qnil;
staticpro (&Vloads_in_progress);
+
+ Qutf_translate_cjk_mode = intern ("utf-translate-cjk-mode");
+ staticpro (&Qutf_translate_cjk_mode);
+
+ Qutf_translate_cjk_lang_env = intern ("utf-translate-cjk-lang-env");
+ staticpro (&Qutf_translate_cjk_lang_env);
+
+ Qutf_translate_cjk_load_tables = intern ("utf-translate-cjk-load-tables");
+ staticpro (&Qutf_translate_cjk_load_tables);
+
+ Qutf_subst_table_for_decode = intern ("utf-subst-table-for-decode");
+ staticpro (&Qutf_subst_table_for_decode);
+
+ Qtranslation_hash_table = intern ("translation-hash-table");
+ staticpro (&Qutf_subst_table_for_decode);
+
+ Qutf_translation_table_for_decode = intern
("utf-translation-table-for-decode");
+ staticpro (&Qutf_translation_table_for_decode);
+
+ Qtranslation_table = intern ("translation-table");
+ staticpro (&Qtranslation_table);
}
/* arch-tag: a0d02733-0f96-4844-a659-9fd53c4f414d
Oliver
--
16 Floréal an 214 de la Révolution
Liberté, Egalité, Fraternité!
- Re: [PATCH] Unicode Lisp reader escapes, (continued)
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Kim F. Storm, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Stefan Monnier, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Kim F. Storm, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Eli Zaretskii, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Stefan Monnier, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Eli Zaretskii, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Stuart D. Herring, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Stefan Monnier, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes,
Oliver Scholz <=
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Eli Zaretskii, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Aidan Kehoe, 2006/05/04
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Aidan Kehoe, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Eli Zaretskii, 2006/05/05
- Re: [PATCH] Unicode Lisp reader escapes, Richard Stallman, 2006/05/06
- Re: [PATCH] Unicode Lisp reader escapes, Oliver Scholz, 2006/05/06