URL:
<https://savannah.gnu.org/bugs/?64255>
Summary: [eqn] "big" is broken
Group: GNU roff
Submitter: gbranden
Submitted: Fri 26 May 2023 07:24:08 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: Fri 26 May 2023 07:24:08 AM UTC By: G. Branden Robinson <gbranden>
Affects groff 1.22.4. Appears to go all the way back to this feature's
introduction in commit d239103a7b, 3 February 2007.
"big" is documented as a primitive, but it doesn't work that way. Instead it
is contextually meaningful only after a "size" primitive.
And, moreover, only when MathML is being generated. It causes havoc in
_groff_ output.
$ cat EXPERIMENTS/eqn-use-big.roff
.EQ
big sin x
.EN
.EQ
size big sin x
.EN
$ eqn -TMathML EXPERIMENTS/eqn-use-big.roff
.if !dEQ .ds EQ
.if !dEN .ds EN
.EQ
<math><mrow><mi>b</mi><mi>i</mi><mi>g</mi><mstyle
mathvariant='normal'><mtext>sin</mtext></mstyle><mi>x</mi></mrow></math>
.EN
.EQ
<math><mrow><mstyle mathsize='big'><mstyle
mathvariant='normal'><mtext>sin</mtext></mstyle></mstyle><mi>x</mi></mrow></math>
.EN
$ eqn -Tascii EXPERIMENTS/eqn-use-big.roff |nroff -Tascii | cat -s
troff: EXPERIMENTS/eqn-use-big.roff:14: warning: numeric expression expected
(got 'b')
bigsinx sinx
$ eqn -Tascii EXPERIMENTS/eqn-use-big.roff
.if !dEQ .ds EQ
.if !dEN .ds EN
[...]
.nr 0w2 +\w\(EQ\,b\&i\&g\/\,x\/\(EQ
[...]
.as1 10
\&\E*[0sfont]\f[I]\s'\En[0ssize]u'\,b\&i\&g\/\h'17M'\f[R]sin\f[\n[0f5]]\h'17M'\,x\/\E*[0rfont]
[...]
.ps big \" GBR: !!!!
[...]
(You might notice that the line number in the diagnostic is off. This is due
to _eqn_ itself producing invalid _groff_ input, for which line numbers are
generally not reliable because `lf` requests must be used to align those
numbers with user expectations.)
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