Class: QgsExpressionNodeIndexOperator

class qgis.core.QgsExpressionNodeIndexOperator

Bases: QgsExpressionNode

A indexing expression operator, which allows use of square brackets [] to reference map and array items.

Added in version 3.6.

QgsExpressionNodeIndexOperator(container: Optional[QgsExpressionNode], index: Optional[QgsExpressionNode]) Constructor for QgsExpressionNodeIndexOperator.

QgsExpressionNodeIndexOperator(a0: QgsExpressionNodeIndexOperator)

Methods

clone	rtype: Optional[QgsExpressionNode]
container	Returns the container node, representing an array or map value.
dump	rtype: str
evalNode	param parent:
index	Returns the index node, representing an array element index or map key.
isStatic	param parent:
needsGeometry	rtype: bool
nodeType	rtype: QgsExpressionNode.NodeType
prepareNode	param parent:
referencedColumns	rtype: Set[str]
referencedFunctions	rtype: Set[str]
referencedVariables	rtype: Set[str]

clone(self) → QgsExpressionNode | None

Return type:

Optional[QgsExpressionNode]

container(self) → QgsExpressionNode | None

Returns the container node, representing an array or map value.

See also

index()

Return type:

Optional[QgsExpressionNode]

dump(self) → str

Return type:

str

evalNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → Any

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

Any

index(self) → QgsExpressionNode | None

Returns the index node, representing an array element index or map key.

See also

container()

Return type:

Optional[QgsExpressionNode]

isStatic(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

bool

needsGeometry(self) → bool

Return type:

bool

nodeType(self) → QgsExpressionNode.NodeType

Return type:

QgsExpressionNode.NodeType

prepareNode(self, parent: QgsExpression | None, context: QgsExpressionContext | None) → bool

Parameters:

• parent (Optional[QgsExpression])

• context (Optional[QgsExpressionContext])

Return type:

bool

referencedColumns(self) → Set[str]

Return type:

Set[str]

referencedFunctions(self) → Set[str]

Return type:

Set[str]

referencedVariables(self) → Set[str]

Return type:

Set[str]