@netwerk-digitaal-erfgoed/ld-workbench/build/utils/getEngineSource.js

LDWorkbench is a Linked Data Transformation tool designed to use only SPARQL as transformation language.

import { isPreviousStage } from './guards.js';
import { existsSync } from 'fs';
import path from 'path';
export default function getEngineSource(endpoint) {
    if (isPreviousStage(endpoint)) {
        const previousStage = endpoint.load();
        if (!existsSync(previousStage.destinationPath)) {
            throw new Error(`The result from stage "${previousStage.name}" (${previousStage.destinationPath}) is not available, make sure to run that stage first`);
        }
        return {
            type: 'file',
            value: path.resolve(previousStage.destinationPath),
        };
    }
    else if (endpoint instanceof URL) {
        return {
            type: 'sparql',
            value: endpoint.toString(),
        };
    }
    return {
        value: endpoint.toString(),
    };
}
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