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[ExpressionLanguage] Mention parsing and linting #19528

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Feb 7, 2024
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[ExpressionLanguage] Mention parsing and linting #19528

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20 changes: 20 additions & 0 deletions components/expression_language.rst
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Expand Up @@ -96,6 +96,26 @@ can chain multiple coalescing operators.

The null-coalescing operator was introduced in Symfony 6.2.

Parsing and Linting Expressions
...............................

The ExpressionLanguage component provides a way to parse and lint expressions.
The :method:`Symfony\\Component\\ExpressionLanguage\\ExpressionLanguage::parse`
method returns a :class:`Symfony\\Component\\ExpressionLanguage\\ParsedExpression`
instance that can be used to inspect and manipulate the expression. The
:method:`Symfony\\Component\\ExpressionLanguage\\ExpressionLanguage::lint`, on the
other hand, returns a boolean indicating if the expression is valid or not::

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;

$expressionLanguage = new ExpressionLanguage();

var_dump($expressionLanguage->parse('1 + 2'));
// displays the AST nodes of the expression which can be
// inspected and manipulated

var_dump($expressionLanguage->lint('1 + 2')); // displays true

Passing in Variables
--------------------

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