Class: QgsExpressionNodeFunction

class qgis.core.QgsExpressionNodeFunction

Bases: QgsExpressionNode

An expression node for expression functions.

QgsExpressionNodeFunction(fnIndex: int, args: QgsExpressionNode.NodeList) 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

Returns a list of arguments specified for the function.

clone

rtype

QgsExpressionNode

dump

rtype

str

evalNode

param parent

fnIndex

Returns the index of the node’s function.

isStatic

param parent

nodeType

rtype

QgsExpressionNode.NodeType

prepareNode

param parent

referencedColumns

rtype

Set[str]

referencedFunctions

rtype

Set[str]

referencedVariables

rtype

Set[str]

validateParams

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

args(self)QgsExpressionNode.NodeList

Returns a list of arguments specified for the function.

Return type

QgsExpressionNode.NodeList

clone(self)QgsExpressionNode
Return type

QgsExpressionNode

dump(self)str
Return type

str

evalNode(self, parent: QgsExpression, context: QgsExpressionContext)Any
Parameters
Return type

Any

fnIndex(self)int

Returns the index of the node’s function.

Return type

int

isStatic(self, parent: QgsExpression, context: QgsExpressionContext)bool
Parameters
Return type

bool

nodeType(self)QgsExpressionNode.NodeType
Return type

QgsExpressionNode.NodeType

prepareNode(self, parent: QgsExpression, context: QgsExpressionContext)bool
Parameters
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]

validateParams(fnIndex: int, args: QgsExpressionNode.NodeList, error: str)bool

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

Parameters
Return type

bool