Add generating code for bidirectional character mirror mappings - libgrapheme - unicode string library
(HTM) git clone git://git.suckless.org/libgrapheme
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---
(DIR) commit 77e30a69ce0807fbee01d43eebedda34b54f41af
(DIR) parent f320b0ad8b7b2bc7ab5b63e91379012adbd19d12
(HTM) Author: Laslo Hunhold <dev@frign.de>
Date: Wed, 24 May 2023 18:05:39 +0200
Add generating code for bidirectional character mirror mappings
Signed-off-by: Laslo Hunhold <dev@frign.de>
Diffstat:
M gen/bidirectional.c | 61 +++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/gen/bidirectional.c b/gen/bidirectional.c
@@ -402,9 +402,43 @@ fill_missing(uint_least32_t cp)
}
}
+static struct properties *prop_mirror = NULL;
+
+static int
+mirror_callback(const char *file, char **field, size_t nfields, char *comment,
+ void *payload)
+{
+ uint_least32_t cp, cp_mirror;
+
+ (void)file;
+ (void)comment;
+ (void)payload;
+
+ hextocp(field[0], strlen(field[0]), &cp);
+
+ cp_mirror = cp;
+
+ if (nfields >= 2 && strlen(field[1]) > 0 &&
+ hextocp(field[1], strlen(field[1]), &cp_mirror)) {
+ return 1;
+ }
+
+ prop_mirror[cp].property = (int_least32_t)cp_mirror - (int_least32_t)cp;
+
+ return 0;
+}
+
+static int_least64_t
+get_value(const struct properties *prop, size_t offset)
+{
+ return prop[offset].property;
+}
+
int
main(int argc, char *argv[])
{
+ struct properties_compressed comp_mirror;
+ struct properties_major_minor mm_mirror;
size_t i;
(void)argc;
@@ -438,5 +472,32 @@ main(int argc, char *argv[])
}
printf("};\n");
+ /*
+ * allocate property buffer for all 0x110000 codepoints
+ *
+ * the buffers contain the offset from the "base" character
+ * to the respective mirrored character. By callocing we set all
+ * fields to zero, which is also the Unicode "default" in the sense
+ * that the coe point is its mirror (unless we fill it in)
+ */
+ if (!(prop_mirror = calloc(UINT32_C(0x110000), sizeof(*prop_mirror)))) {
+ fprintf(stderr, "calloc: %s\n", strerror(errno));
+ exit(1);
+ }
+ parse_file_with_callback(FILE_BIDI_MIRRORING, mirror_callback, NULL);
+
+ /* compress properties */
+ properties_compress(prop_mirror, &comp_mirror);
+
+ fprintf(stderr, "%s: mirror-LUT compression-ratio: %.2f%%\n", argv[0],
+ properties_get_major_minor(&comp_mirror, &mm_mirror));
+
+ /* print tables */
+ properties_print_lookup_table("mirror_major", mm_mirror.major, 0x1100);
+ printf("\n");
+ properties_print_derived_lookup_table("mirror_minor", mm_mirror.minor,
+ mm_mirror.minorlen, get_value,
+ comp_mirror.data);
+
return 0;
}