URL:
<https://savannah.gnu.org/bugs/?65137>
Summary: [troff] support construction of arbitrary byte
sequences in device control commands
Group: GNU roff
Submitter: gbranden
Submitted: Mon 08 Jan 2024 10:13:02 AM UTC
Category: Core
Severity: 1 - Wish
Item Group: Feature change
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
_______________________________________________________
Follow-up Comments:
-------------------------------------------------------
Date: Mon 08 Jan 2024 10:13:02 AM UTC By: G. Branden Robinson <gbranden>
This is my generalization of Deri's `stringhex` request in the deri-gropdf-ng
branch.
In my working copy, I embedded the idea where the code would go.
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);
}
_______________________________________________________
Reply to this item at:
<https://savannah.gnu.org/bugs/?65137>
_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/
