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)

An expression node for expression functions.

Methods

args	Returns a list of arguments specified for the function.
clone
dump
evalNode
fnIndex	Returns the index of the node’s function.
isStatic
nodeType
prepareNode
referencedColumns
referencedFunctions
referencedVariables
validateParams	Tests whether the provided argument list is valid for the matching function

Signals

Attributes

args(self) → QgsExpressionNode.NodeList

Returns a list of arguments specified for the function.

clone(self) → QgsExpressionNode

dump(self) → str

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

fnIndex(self) → int

Returns the index of the node’s function.

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

nodeType(self) → QgsExpressionNode.NodeType

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

referencedColumns(self) → Set[str]

referencedFunctions(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