Function getVariablesFromExpression

getVariablesFromExpression(
    expression: Expression,
    variables: Set<string>,
    isAggregateFunction?: AggregateFunctionTest,
    astTransformer?: AstTransformer,
): void
Get all variables used in an expression, including those within (SPARQL 1.2) triple terms. Does not look inside (custom) aggregates, nor in EXISTS or NOT EXISTS patterns.
Parameters
- expression: Expression
  The expression to get the variables of.
- variables: Set<string>
  The set to add the variables to.
- isAggregateFunction: AggregateFunctionTest = anyFunctionCall
  Whether a function call is a custom aggregate. Default: any function call might be.
- astTransformer: AstTransformer = expressionTransformer
  The transformer to traverse the expression with.
Returns void
- Defined in rules-sparql-1-1/lib/validation/validators.ts:142