Subgroup: Expression

Class: QgsExpressionNodeFunction¶

class qgis.core.QgsExpressionNodeFunction(fnIndex: int, args: QgsExpressionNode.NodeList)¶

Bases: qgis._core.QgsExpressionNode

A function node consists of an index of the function in the global function array and a list of arguments that will be passed to it.

QgsExpressionNodeFunction(QgsExpressionNodeFunction)

Methods

args

clone

dump

eval Evaluate this node with the given context and parent.

evalNode

fnIndex

isStatic

needsGeometry

nodeType

prepare Prepare this node for evaluation.

prepareNode

referencedColumns

referencedVariables

validateParams Tests whether the provided argument list is valid for the matching function

Attributes

ntBinaryOperator

ntColumnRef

ntCondition

ntFunction

ntInOperator

ntLiteral

ntUnaryOperator

args(self) → QgsExpressionNode.NodeList¶

clone(self) → QgsExpressionNode¶

dump(self) → str¶

evalNode(self, parent: QgsExpression, context: QgsExpressionContext) → Any¶

fnIndex(self) → int¶

isStatic(self, parent: QgsExpression, context: QgsExpressionContext) → bool¶

needsGeometry(self) → bool¶

nodeType(self) → QgsExpressionNode.NodeType¶

prepareNode(self, parent: QgsExpression, context: QgsExpressionContext) → bool¶

referencedColumns(self) → Set[str]¶

referencedVariables(self) → Set[str]¶

validateParams(fnIndex: int, args: QgsExpressionNode.NodeList, error: str) → bool¶: Tests whether the provided argument list is valid for the matching function