PHP Class Webmozart\Expression\Traversal\ExpressionTraverser

You can attach {@link ExpressionVisitor} instances to the traverse which will be invoked for every node of the expression tree.

Since: 1.0

Author: Bernhard Schussek ([email protected])

Public Methods

Method	Description
addVisitor ( Webmozart\Expression\Traversal\ExpressionVisitor $visitor )	Adds a visitor to the traverser.
getVisitors ( ) : Webmozart\Expression\Traversal\ExpressionVisitor[]	Returns the visitors of the traverser.
removeVisitor ( Webmozart\Expression\Traversal\ExpressionVisitor $visitor )	Removes a visitor from the traverser.
traverse ( Webmozart\Expression\Expression $expr ) : Webmozart\Expression\Expression	Traverses an expression.

Method	Description
traverseConjunction ( AndX $expr )
traverseDisjunction ( OrX $expr )
traverseForVisitor ( Webmozart\Expression\Expression $expr, Webmozart\Expression\Traversal\ExpressionVisitor $visitor )
traverseKey ( Key $expr )
traverseNot ( Webmozart\Expression\Logic\Not $expr )

The visitors are invoked in the order in which they are added.

public addVisitor ( Webmozart\Expression\Traversal\ExpressionVisitor $visitor )
$visitor	Webmozart\Expression\Traversal\ExpressionVisitor	The visitor to add.

Returns the visitors of the traverser.

public getVisitors ( ) : Webmozart\Expression\Traversal\ExpressionVisitor[]
return	Webmozart\Expression\Traversal\ExpressionVisitor[]	The visitors.

If the visitor was added multiple times, all instances are removed.

public removeVisitor ( Webmozart\Expression\Traversal\ExpressionVisitor $visitor )
$visitor	Webmozart\Expression\Traversal\ExpressionVisitor	The visitor to remove.

Traverses an expression.

public traverse ( Webmozart\Expression\Expression $expr ) : Webmozart\Expression\Expression
$expr	Webmozart\Expression\Expression	The expression to traverse.
return	Webmozart\Expression\Expression	The modified expression. May be `null` if the expression was removed entirely.