URL:
<https://savannah.gnu.org/bugs/?64239>
Summary: [eqn] handle input leaders like input tabs
Group: GNU roff
Submitter: gbranden
Submitted: Tue 23 May 2023 08:09:18 AM UTC
Category: Preprocessor eqn
Severity: 3 - Normal
Item Group: Incorrect behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Follow-up Comments:
-------------------------------------------------------
Date: Tue 23 May 2023 08:09:18 AM UTC By: G. Branden Robinson <gbranden>
Input tab characters are rejected except at the "outermost" level of lexical
grouping. (eqn is not fooled by superfluous braces.)
Since leaders are pretty much "noisy" tabs, they should be handled similarly.
$ hd EXPERIMENTS/eqn-using-tab.roff
00000000 2e 45 51 0a 61 09 62 20 73 71 72 74 20 7b 20 63 |.EQ.a.b sqrt {
c|
00000010 09 64 20 7d 0a 2e 45 4e 0a |.d }..EN.|
00000019
$ ./build/eqn -Tascii EXPERIMENTS/eqn-using-tab.roff >/dev/null
./build/eqn:EXPERIMENTS/eqn-using-tab.roff:1: error: tabs allowed only at
outermost level
$ hd EXPERIMENTS/eqn-using-leader.roff
00000000 2e 45 51 0a 61 01 62 20 73 71 72 74 20 7b 20 63 |.EQ.a.b sqrt {
c|
00000010 01 64 20 7d 0a 2e 45 4e 0a |.d }..EN.|
00000019
$ ./build/eqn -Tascii EXPERIMENTS/eqn-using-leader.roff >/dev/null
[bupkis; no diagnostic]
And indeed things go pretty wrong if you sneak a leader past _eqn_.
$ ./build/test-groff -e -Tascii EXPERIMENTS/eqn-using-leader.roff | cat -s
troff:EXPERIMENTS/eqn-using-leader.roff:20: warning: special character 'sqrt'
not defined
troff:EXPERIMENTS/eqn-using-leader.roff:49: warning: special character 'rn'
not defined
troff:EXPERIMENTS/eqn-using-leader.roff:2: error: invalid token in argument to
escaped 'Z'
troff: error: horizontal line drawing character must have positive width
a.......bcd
The code change would happen
[https://git.savannah.gnu.org/cgit/groff.git/tree/src/preproc/eqn/box.cpp?h=1.23.0.rc4#n583
around here].
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