[bug #45502] .if, .ie, .el syntax issue

[Carsten Kunze]

URL:
  <http://savannah.gnu.org/bugs/?45502>

                 Summary: .if, .ie, .el syntax issue
                 Project: GNU troff
            Submitted by: carstenkunze
            Submitted on: Thu 09 Jul 2015 03:26:27 PM GMT
                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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Details:

Specification:  The conditionally processed commands or text need to follow
".if expr", ".ie expr", and ".el" separated by space *on the same line* (i.e.
.ie <expr> <anything>).

Wrong behaviour:  If ".if expr", ".ie expr", or ".el" is followed by nothing
on a line the next line is executed conditionally.

This is not compliant with the specified syntax and leads to documents where
this wrong syntax is not noticed (since it works).

Example:

.pl 5
.de A
.       ie \\$1
.               tm \\$1: true
.       el
.               tm \\$1: false
..
.A 0
.A 1

The output is

0: false
1: true

whereas the expected (stderr) output would be

0: true
0: false
1: true
1: false

Since the .ie and .el statements have a wrong syntax the following line needs
to be processed unconditionally.

Additionally a warning could be output for the lines with wrong syntax.




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