CodeMirror Special Character Indicator

Extensible special character indicator for CodeMirror, which is useful to avoid hard-to-find errors caused by non-usual characters.

Backgrounds

CodeMirror which is integrated in WP code editor also supports special characters indicator.

However, the default indicator (red dot) is a bit small. In addition WP doesn't have proper way to extend CodeMirror settings that is not JSON-encodable.

This plugin provides easy-to-find indication and the filter hook to extend special characters.

Special characters

By default, this plugin emphasizes the special characters below.

The default special characters defined by CodeMirror

The characters below are the default ones supported by CodeMirror by default.

• U+0000-U+001F
• U+007F-U+009F
• U+00AD
• U+061C
• U+200B-U+200F
• U+2028
• U+2029
• U+FEFF

Additional special characters

This plugin adds a few characters below.

• U+00A0
• U+FEFE

Hooks

You can modify special characters what you want to emphasize by the filter hook below.

apply_filters( 'cmsci_special_chars', $special_chars )

Filters the list of the special characters to highlight.

Description

This includes the same elements as the default value of CodeMirror.defaults.specialChars option by default.

Parameters

• $special_chars (string[]) An array of the special characters. Each element is evaluated as a character in RegExp character class.

LICENSE

• MIT
• GNU General Public License v2 or later

SPDX-License-Identifier: MIT OR GPL-2.0-or-later