Update of bug#63074 (group groff):
Status: None => In Progress
Assigned to: None => gbranden
Summary: [troff] need a way to embed non-Basic Latin glyphs
in device control commands => [troff] support construction of arbitrary byte
sequences in device control commands
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Follow-up Comment #18:
This is a skeleton of my proposal, an alternative to Deri's new `stringhex`
request in his branch, "deri-gropdf-ng".
Originally posted in a recent duplicate bug #65137.
diff --git a/src/roff/troff/input.cpp b/src/roff/troff/input.cpp
index a0b987634..f6e5b1279 100644
--- a/src/roff/troff/input.cpp
+++ b/src/roff/troff/input.cpp
@@ -5571,7 +5571,7 @@ static node *do_non_interpreted()
return new non_interpreted_node(mac);
}
-static void encode_char(macro *mac, char c)
+static void encode_char_for_device_control(macro *mac, char c)
{
if (c == '\0') {
if (tok.is_stretchable_space()
@@ -5600,6 +5600,13 @@ static void encode_char(macro *mac, char c)
else if (strcmp("ti", sc) == 0)
mac->append('~');
else {
+ // TODO: Support '\[uXXXX]' for all devices to support
+ // transmission of arbitrary data to the output device. It's a
+ // misnomer--this doesn't necessarily represent a Unicode code
+ // point, but this syntax beats inventing a new one for this
+ // esoteric purpose. Whether one sends \[uAABB],
+ // \[u00AA]\[u00BB], or the latter's byte-swapped counterpart is
+ // an interface detail that the output device must specify.
if (font::use_charnames_in_special) {
if (sc[0] != (char)0) {
mac->append('\\');
@@ -5612,9 +5619,14 @@ static void encode_char(macro *mac, char c)
mac->append(']');
}
else
- error("special character '%1' cannot be used within"
- " device control escape sequence", sc);
+ error("special character '%1' cannot be used within a"
+ " device control escape sequence", sc);
}
+ else
+ // TODO: Put '\[uXXXX]' support here. Don't allow
+ // '\[uXXXX_YYYY]'.
+ error("special character '%1' cannot be used within a device"
+ " control escape sequence", sc);
}
}
else if (!(tok.is_hyphen_indicator()
@@ -5668,7 +5680,7 @@ static node *do_special()
c = '\b';
else
c = tok.ch();
- encode_char(&mac, c);
+ encode_char_for_device_control(&mac, c);
}
return new special_node(mac);
}
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<https://savannah.gnu.org/bugs/?63074>
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