| Subject: | as_graphviz() quoting of attribute values |
| Date: | Thu, 11 Jun 2015 22:23:07 +1000 |
| To: | bug-Graph-Easy [...] rt.cpan.org |
| From: | Kevin Ryde <user42_kevin [...] yahoo.com.au> |
If a graph attribute value starts with a digit but is not a number, then
as_graphviz() does not quote it the way the graphviz dot program
requires. For example foo.pl below gives
graph [ rankdir=LR, root=0e ];
which dot doesn't like
Warning: syntax ambiguity - badly delimited number '0e' in line 6 of /tmp/foo.dot splits into two tokens
Error: /tmp/foo.dot: syntax error in line 6 near ']'
(The graphviz docs say an alphanumeric bare ID can't start with a
digit.)
It looks like " characters in an attribute value should be escaped too.
bar.pl below gives
graph [ rankdir=LR, root="qq"qq" ];
...
"qq\"qq" [ rank=0 ]
The node name part is escaped correctly, but not the attribute part
Error: /tmp/foo.dot: syntax error in line 6 near '"'
A quote in a node name is hopefully unusual, but dot seems to allow it
if escaped.
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