protected function TestUiParser::validateExpression in Feeds extensible parsers 8

Validates an expression.

Parameters

string &$expression: The expression to validate.

Return value

string|null Return the error string, or null if validation was passed.

Overrides ParserBase::validateExpression

File

tests/modules/feeds_ex_test/src/Feeds/Parser/TestUiParser.php, line 37

Class

TestUiParser

A minimal implementation of a parser for UI testing.

Namespace

Drupal\feeds_ex_test\Feeds\Parser

Code

protected function validateExpression(&$expression) {
}