Bug 355300 - Perl: Variables starting with an underscore are highlighted wrongly
Summary: Perl: Variables starting with an underscore are highlighted wrongly
Alias: None
Product: frameworks-syntax-highlighting
Classification: Frameworks and Libraries
Component: syntax (show other bugs)
Version: unspecified
Platform: Debian testing Linux
: NOR minor
Target Milestone: ---
Assignee: KWrite Developers
Depends on:
Reported: 2015-11-13 18:13 UTC by Victor Porton
Modified: 2018-09-10 08:20 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In: 5.51.0
Sentry Crash Report:


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Description Victor Porton 2015-11-13 18:13:07 UTC
Perl code like:


is highlighted wrongly (in my opinion). Particularly, the color of underscore should be probably the same as of the word "Client". Also $ should not change color dependently on presence of the underscore.

It seems being a bug caused by incorrect identification of $_ as a special Perl variable.

Kate 15.08.2.

Reproducible: Always
Comment 1 Buovjaga 2016-06-27 08:02:17 UTC

Arch Linux 64-bit
Kate 16.04.2
KDE Frameworks 5.23.0
Qt 5.7
xcb wm
Comment 2 Nibaldo G. 2018-09-10 08:20:03 UTC
Git commit d0c698198ec8abc2245ee3d2ab38eabf8f62f444 by Nibaldo González.
Committed on 10/09/2018 at 08:19.
Pushed by ngonzalez into branch 'master'.

Perl: fix brackets, variables, string references and others

### Fix incorrect bracket closures in RegExp patterns
Related: bug 364866, bug 348765, bug 391577

Recursive subgroups are added inside brackets `{}` and `()`, to avoid incorrect closures in RegExp patterns. This correction is in accordance with other text editors (VS Code, Atom, gedit & Sublime Text), which highlight the RegExp patterns in that way.

### Allow strings as scalar references

Previously, the characters `"` and `'` were escaped, which caused an erroneous highlight when using references such as `\'string'` (see ref. [1] and [2]).

### Fix incorrect highlighting of variables that start with underscores

This error was caused by the order of the RegExpr rules to detect variables: `[@\$][\+\-_]` had priority over `\$[#_][\w_]` (`$_` is a special variable) (ref. [3] & [4]).

### Fix incorrect highlighting of characters in variables

Previously, characters such as `()[]}` were highlighted after `*` in some variables, such as `@*)`, causing incorrect closures of brackets.

### Other fixes:

* Add variables with carret, such as: `${^Foo}` or `$^V` (ref. [3]).
* Add special variables: `%+`, `%-`, `%!` & `%^H` (ref. [3]).
* Missing escapes are added, such as `\x{NN..}`, `\o{NN..}` (full list in ref. [5]).


* [1] Perl References: https://gist.github.com/afair/2402068
* [2] PerlMonks. Constant string reference: https://www.perlmonks.org/?node_id=413500
* [3] Perl Programming Documentation. perlvar: https://perldoc.perl.org/perlvar.html
* [4] PerlMonks. Perl Special Variables Quick Reference: https://www.perlmonks.org/?node_id=353259
* [5] Perl Programming Documentation. perlrebackslash: https://perldoc.perl.org/perlrebackslash.html

FIXED-IN: 5.51.0

Reviewers: cullmann, dhaumann, #framework_syntax_highlighting

Reviewed By: cullmann, #framework_syntax_highlighting

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: #kate, #frameworks

Differential Revision: https://phabricator.kde.org/D15397

M  +20   -0    autotests/folding/highlight.pl.fold
M  +20   -0    autotests/html/highlight.pl.html
M  +20   -0    autotests/input/highlight.pl
M  +20   -0    autotests/reference/highlight.pl.ref
M  +58   -13   data/syntax/perl.xml