Adding a new escape sequence B'...': If the string between

the delimiters is a valid numeric expression, return the character
`1', and `0' otherwise.  This is an analogon to A.

* src/roff/troff/input.cc (do_expr_test): Implement it.
(token::next): Use it.
* src/roff/troff/troff.man, NEWS, man/groff.man: Document it.

* tmac/tmac.trace: Made independent from escape character.


Adding a new request .dei: define indirect.  The first and second
parameter of .dei are taken from string registers instead directly;
this very special request is needed to make tmac.trace independent
from the escape character (which might even be disabled).

* src/roff/troff/input.cc (do_define_macro): Implement it.
(define_macro_indirect): New function.
(init_input_requests): Use it.

Adding two requests .ecs and .ecr: Save and restore the escape
character.  These two requests are needed to make tmac.trace
independent from the escape character (which might even be
disabled).

* src/roff/troff/input.cc (save_escape_char, restore_escape_char):
Implement it.
(init_input_requests): Use it.

* src/roff/troff/troff.man, NEWS, man/groff.man: Updated.

1 files changed, 37 insertions, 5 deletions

diff --git a/man/groff.man b/man/groff.man
index c13f1f7d..09b4f6ea 100644
--- a/man/groff.man
+++ b/man/groff.man
@@ -1010,6 +1010,21 @@ until
 .request .end
 is called.
 .
+.REQ .dei macro
+Define or redefine a macro whose name is contained in the string register
+.argument macro
+until
+.request ..
+is called.
+.
+.REQ .dei macro end
+Define or redefine a macro indirectly.
+.argument macro
+and
+.argument end
+are string registers whose contents are interpolated for the macro name
+and the end macro, respectively.
+.
 .REQ .di
 End current diversion.
 .
@@ -1042,6 +1057,13 @@ Reset escape character to
 Set escape character to
 .argument c .
 .
+.REQ .ecs
+Save current escape character.
+.
+.REQ .ecr
+Restore escape character saved with
+.request .ecs .
+.
 .REQ .el anything
 Else part for if-else (\c
 .argument .ie )
@@ -1947,15 +1969,25 @@ Non-interpreted leader character.
 .ESCq A anything
 If
 .argument anything
-acceptable as name of a string, macro, diversion, register,
-environment or font it is
-.number 1
-otherwise
-.number 0 .
+is acceptable as a name of a string, macro, diversion, register,
+environment or font it expands to
+.number 1 ,
+and
+.number 0
+otherwise.
 .
 .ESCq b abc...
 Bracket building function.
 .
+.ESCq B anything
+If
+.argument anything
+is acceptable as a valid numeric expression it expands to
+.number 1 ,
+and
+.number 0
+otherwise.
+.
 .ESC c
 Interrupt text processing.
 .