gbranden pushed a commit to branch master
in repository groff.
commit a729e70ffdc93cc68ed58f402b66c85478b4852e
Author: Nguyễn Gia Phong <[email protected]>
AuthorDate: Wed Jul 8 11:14:03 2026 +0900
[eqn]: Emit better-formed XHTML/MathML. (2/3)
* src/preproc/eqn/text.cpp: Stop mapping special characters to named
entities when outputting MathML. Preprocessor-include "unicode.h".
(special_char_box::output): Use libgroff's
`valid_unicode_code_sequence()` to obtain its Unicode sequence
representation if it is in groff Unicode special character escape
sequence syntax. If not, use `glyph_name_to_unicode()` to look up its
Unicode representation.
Continues fixing <https://savannah.gnu.org/bugs/?68499>.
---
ChangeLog | 13 +++++++++++++
src/preproc/eqn/text.cpp | 9 ++++++---
2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index a0b3a0319..a52fe8b39 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2026-07-08 Nguyễn Gia Phong <[email protected]>
+
+ * src/preproc/eqn/text.cpp: Stop mapping special characters to
+ named entities when outputting MathML. Preprocessor-include
+ "unicode.h".
+ (special_char_box::output): Use libgroff's
+ `valid_unicode_code_sequence()` to obtain its Unicode sequence
+ representation if it is in groff Unicode special character
+ escape sequence syntax. If not, use `glyph_name_to_unicode()`
+ to look up its Unicode representation.
+
+ Continues fixing <https://savannah.gnu.org/bugs/?68499>.
+
2026-07-08 Nguyễn Gia Phong <[email protected]>
* src/preproc/eqn/box.cpp
diff --git a/src/preproc/eqn/text.cpp b/src/preproc/eqn/text.cpp
index 7753fd36f..dc0c33d9f 100644
--- a/src/preproc/eqn/text.cpp
+++ b/src/preproc/eqn/text.cpp
@@ -28,6 +28,7 @@ along with this program. If not, see
<http://www.gnu.org/licenses/>. */
#include "eqn.h"
#include "pbox.h"
#include "ptable.h"
+#include "unicode.h" // valid_unicode_code_sequence()
struct map {
const char *from;
@@ -666,9 +667,11 @@ void special_char_box::output()
printf("\\fP");
}
else if (output_format == mathml) {
- const char *entity = special_to_entity(s);
- if (entity != NULL)
- printf("<mo>%s</mo>", entity);
+ const char *unicode_code_point = valid_unicode_code_sequence(s);
+ if (unicode_code_point == NULL)
+ unicode_code_point = glyph_name_to_unicode(s);
+ if (unicode_code_point != NULL)
+ printf("<mo>&#x%s;</mo>", unicode_code_point);
else
printf("<merror>unknown eqn/troff special char %s</merror>", s);
}
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