Class SparqlVariableParser

Helper class for extracting variables from SPARQL query CST nodes.

Index

Constructors

Methods

getSelectedVariables

Constructors

constructor

new SparqlVariableParser(): SparqlVariableParser
Returns SparqlVariableParser

Methods

getSelectedVariables

getSelectedVariables(cst: CstNode): string[]
Extracts the result variables from a SELECT query in the order they are defined.

Handles:
- Simple variable projections: SELECT ?x ?y
- Projections with AS: SELECT (?x AS ?y)
- Aggregates with AS: SELECT (COUNT(?x) AS ?count)
- SELECT *: returns all variables from the WHERE clause in order of first appearance
Parameters
- cst: CstNode
  The concrete syntax tree from parsing a SPARQL query
Returns string[]
An array of variable names (without the ? or $ prefix) in projection order

Throws
Error if the query is not a SELECT query
- Defined in src/sparql/parser.ts:313