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Add Option to Keep Query Prefixes #187

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Add Option to Keep Query Prefixes #187

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97e3867
Add Option to Keep Query Prefixes
vitalis-wiens Mar 7, 2025
16a16b4
Add Option for fixed set of prefixes
vitalis-wiens Mar 11, 2025
4fb5dd8
Revised the option for the generator
vitalis-wiens Mar 12, 2025
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8 changes: 5 additions & 3 deletions lib/SparqlGenerator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,12 @@ Generator.prototype.toQuery = function (q) {
Generator.prototype.baseAndPrefixes = function (q) {
var base = q.base ? ('BASE <' + q.base + '>' + this._newline) : '';
var prefixes = '';
// when option "allPrefixes" is an object use it as fixedPrefixes
var fixedPrefixes = typeof this._options.allPrefixes === 'object' ? this._options.allPrefixes: {}
for (var key in q.prefixes) {
if (this._options.allPrefixes || this._usedPrefixes[key])
if (this._options.allPrefixes === true || this._usedPrefixes[key] || fixedPrefixes[key])
prefixes += 'PREFIX ' + key + ': <' + q.prefixes[key] + '>' + this._newline;
}
}
return base + prefixes;
};

Expand Down Expand Up @@ -450,7 +452,7 @@ function mapJoin(array, sep, func, self) {

/**
* @param options {
* allPrefixes: boolean,
* allPrefixes: boolean | prefixList,
* indentation: string,
* newline: string
* }
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41 changes: 41 additions & 0 deletions test/SparqlGenerator-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,47 @@ var parsedQueriesPath = __dirname + '/../test/parsedQueries/';
var unusedPrefixesPath = __dirname + '/../test/unusedPrefixes/';

describe('A SPARQL generator', function () {
it('should preserve prefixes specified in the allPrefixes', function () {
var parser = new SparqlParser({
prefixes: {
schema: "https://schema.org/",
owl: "http://www.w3.org/2002/07/owl#"
}
});
var allPrefixes={
db_opt: 'https://db.control.param_10'
}
var parsedQuery = parser.parse('PREFIX db_opt: <https://db.control.param_10> \n SELECT * WHERE {?s a owl:Class}');
var generator = new SparqlGenerator({allPrefixes});
var generatedQuery = generator.stringify(parsedQuery);
var expectedQuery = 'PREFIX db_opt: <https://db.control.param_10>\nPREFIX owl: <http://www.w3.org/2002/07/owl#>\nSELECT * WHERE { ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> owl:Class. }';
expect(generatedQuery).toEqual(expectedQuery);
});

it('should preserve prefixes specified the query using allPrefixes option', function () {
var parser = new SparqlParser({
prefixes: {
schema: "https://schema.org/",
owl: "http://www.w3.org/2002/07/owl#"
}
});

var parsedQuery = parser.parse('PREFIX db_opt: <https://db.control.param_10>\nPREFIX db_optimization: <https://db.optimization.param_100>\n SELECT * WHERE {?s a owl:Class}');

var allPrefixes={}
var queryPrefixes=Object.keys(parsedQuery.prefixes);
for (var key of queryPrefixes) {
allPrefixes[key]=parsedQuery.prefixes[key];
}

var generator = new SparqlGenerator({allPrefixes});
var generatedQuery = generator.stringify(parsedQuery);
var expectedQuery = 'PREFIX db_opt: <https://db.control.param_10>\nPREFIX db_optimization: <https://db.optimization.param_100>\nPREFIX owl: <http://www.w3.org/2002/07/owl#>\nSELECT * WHERE { ?s <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> owl:Class. }';
expect(generatedQuery).toEqual(expectedQuery);
});



var defaultGenerator = new SparqlGenerator();

describe('in SPARQL mode', () => {
Expand Down