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	Add generating code for bidirectional character mirror mappings - libgrapheme -…
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	---
	commit 77e30a69ce0807fbee01d43eebedda34b54f41af
	parent f320b0ad8b7b2bc7ab5b63e91379012adbd19d12
	Author: Laslo Hunhold <[email protected]>
	Date: Wed, 24 May 2023 18:05:39 +0200

	Add generating code for bidirectional character mirror mappings

	Signed-off-by: Laslo Hunhold <[email protected]>

	Diffstat:
	M gen/bidirectional.c \| 61 +++++++++++++++++++++++++++++…

	1 file changed, 61 insertions(+), 0 deletions(-)
	---
	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)c…
	+
	+ 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;
	}