Closed alexander-schulze closed 3 years ago
Do you have the steps to reproduce?
I ran the following steps:
{
"name": "sparqljs-test",
"version": "1.0.0",
"description": "SPARQLJS Test",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"repository": {
"type": "git",
"url": "git+https://github.com/innotrade/sparqljs-test.git"
},
"keywords": [
"SPARQL",
"JS"
],
"author": "Alexander Schulze",
"license": "MIT",
"bugs": {
"url": "https://github.com/innotrade/sparqljs-test/issues"
},
"homepage": "https://github.com/innotrade/sparqljs-test#readme",
"dependencies": {
"sparqljs": "^3.4.1"
}
}
/Users/alexanderschulze/.nvm/versions/node/v12.20.0/bin/node ./index.js
Process exited with code 1
Uncaught TypeError: Cannot read property 'termType' of undefined
The parser works fine, I can see the resulting SPARQL AST object. The generator.stringify(parsedQuery); raises the above exception.
var generator = new SparqlGenerator({
/* prefixes, baseIRI, factory, sparqlStar */
});
parsedQuery.variables = ["?mickey"];
var generatedQuery = generator.stringify(parsedQuery);
Thanks in advance for your support!
My launch.json:
{
"version": "0.2.0",
"configurations": [
{
"type": "pwa-node",
"request": "launch",
"name": "Launch Program",
"runtimeVersion": "12.20.0",
"skipFiles": ["<node_internals>/**"],
"program": "${workspaceFolder}/index.js"
}
]
}
Missed to say thanks for the quick response. Just granted you access to @innotrade/sparqljs-test.
Debugged it and found it, the parsedQuery.variables = ['?mickey'];
is causing the error.
I will play more with it and give you feedback. Would be interested in a cooperation on that one.
@alexander-schulze SPARQL.js uses RDF/JS spec to represent RDF terms including variables, so you need to use RDF term factory to create variable in this case:
import { DataFactory } from 'rdf-data-factory';
var generator = new SparqlGenerator({
/* prefixes, baseIRI, factory, sparqlStar */
});
var dataFactory = new DataFactory();
parsedQuery.variables = [dataFactory.variable("mickey")];
var generatedQuery = generator.stringify(parsedQuery);
Dear RubenVerborgh, when running the code I get the following error "Uncaught TypeError: Cannot read property 'termType' of undefined", while trying to re-generate the SPARQL. Is this a known issue and how could I fix it? The parser works, but the generator fires this issue. I'm using VSC 1.54.3 with node 12.20 on a macOS 10.13.6 (High Sierra). Thanks in advance for looking at that and giving a hint. Best Regards, Alex