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import { AsyncIterator } from 'asynciterator';
import { Store, Writer } from 'n3';
import { Uri } from '@faubulous/mentor-rdf';
import { SparqlLexer, SparqlParser, SparqlVariableParser } from '@faubulous/mentor-rdf-parsers';
import { Bindings, Quad, Term } from "@rdfjs/types";
import { IPrefixLookupService } from '@src/services/document';
import { BindingsResult, SparqlQueryExecutionState } from "./sparql-query-state";
import { toArrayWithCancellation } from '@src/utilities/vscode/cancellation';
import { NamespaceMap } from '@src/utilities';
/**
* Handler for serializing SPARQL query results.
*/
export class SparqlResultSerializer {
constructor(
private readonly prefixLookupService: IPrefixLookupService
) {}
/**
* Serializes SPARQL query results into a format suitable for the webview.
* @param documentIri The IRI of the document where the query was run.
* @param bindingStream The SPARQL query results as a BindingsStream.
* @param limit The maximum number of results to serialize.
* @returns An object containing the serialized results.
*/
async serializeBindings(
context: SparqlQueryExecutionState,
bindingStream: AsyncIterator<Bindings>,
token: vscode.CancellationToken
): Promise<BindingsResult> {
// Note: This evaluates the query results and collects the bindings.
const bindings = await toArrayWithCancellation(bindingStream, token);
const parsedColumns: string[] = [];
if (context.query) {
const lexResult = new SparqlLexer().tokenize(context.query);
const cst = new SparqlParser().parse(lexResult.tokens);
// Parse the variables from select queries in the order they were defined.
const variables = new SparqlVariableParser().getSelectedVariables(cst);
parsedColumns.push(...variables);
}
const namespaces = new Set<string>();
const rows: Record<string, any>[] = [];
const serializeTerm = (value: Term): Record<string, any> => {
const term: Record<string, any> = {
termType: value.termType,
value: value.value,
};
if (value.termType === 'NamedNode') {
namespaces.add(Uri.getNamespaceIri(value.value));
} else if (value.termType === 'Literal') {
term.datatype = { termType: 'NamedNode', value: value.datatype.value };
term.language = value.language;
} else if (Evalue.termType === 'Quad') {
term.subject = serializeTerm(value.subject);
term.predicate = serializeTerm(value.predicate);
term.object = serializeTerm(value.object);
}
return term;
};
for (const binding of bindings) {
const row: Record<string, any> = {};
for (const [key, value] of binding) {
if (!parsedColumns.includes(key.value)) {
parsedColumns.push(key.value);
}
row[key.value] = serializeTerm(value);
}
rows.push(row);
}
const documentIri = context.documentIri;
const namespaceMap: NamespaceMap = {};
for (const iri of namespaces) {
const prefix = this.prefixLookupService.getPrefixForIri(documentIri, iri, '\0');
if (prefix !== '\0') {
namespaceMap[iri] = prefix;
}
}
const result: BindingsResult = {
type: 'bindings',
columns: parsedColumns,
rows,
namespaceMap
};
return result;
}
/**
* Serializes a stream of quads into Turtle format.
* @param context The query execution context.
* @param quadStream The SPARQL query results as a QuadStream.
* @param token The cancellation token.
* @returns A string containing the serialized Turtle document.
*/
async serializeQuads(
context: SparqlQueryExecutionState,
quadStream: AsyncIterator<Quad>,
token: vscode.CancellationToken
): Promise<string> {
try {
const quads = await toArrayWithCancellation(quadStream, token);
if (quads.length === 0) {
return '';
}
// TODO: Request quads from communica instead of manually filtering the triples.
const store = new Store();
// Add all quads to the writer
for (const q of quads) {
store.addQuad(q.subject, q.predicate, q.object);
}
// Get namespace prefixes for better formatting
const documentIri = context.documentIri;
const prefixMap: Record<string, string> = {};
// Collect unique namespace IRIs from the quads
const namespaces = new Set<string>();
for (const quad of quads) {
Eif (quad.subject.termType === 'NamedNode') {
namespaces.add(Uri.getNamespaceIri(quad.subject.value));
}
Eif (quad.predicate.termType === 'NamedNode') {
namespaces.add(Uri.getNamespaceIri(quad.predicate.value));
}
Eif (quad.object.termType === 'NamedNode') {
namespaces.add(Uri.getNamespaceIri(quad.object.value));
}
}
// Build prefix map
for (const iri of namespaces) {
const prefix = this.prefixLookupService.getPrefixForIri(documentIri, iri, '');
if (prefix !== '') {
prefixMap[prefix] = iri;
}
}
// Create N3 writer with prefixes
const writer = new Writer({
format: 'text/turtle',
prefixes: prefixMap
});
writer.addQuads(store.toArray());
// Return the serialized Turtle string
return new Promise<string>((resolve, reject) => {
writer.end((error, result) => {
if (error) {
reject(error);
} else {
resolve(result);
}
});
});
} catch (error) {
console.error('Error serializing quads to Turtle:', error);
return '';
}
}
/**
* Serializes an array of quads into Turtle format without requiring a context.
* @param quads The array of quads to serialize.
* @param namespaces Optional namespace map for prefix resolution.
* @returns A string containing the serialized Turtle document.
*/
async serializeQuadsToString(quads: Quad[], namespaces?: Record<string, string>): Promise<string> {
try {
if (quads.length === 0) {
return '';
}
const store = new Store();
for (const q of quads) {
store.addQuad(q.subject, q.predicate, q.object);
}
const prefixMap: Record<string, string> = {};
if (namespaces) {
Object.assign(prefixMap, namespaces);
} else {
// Collect unique namespace IRIs from the quads
const namespaceIris = new Set<string>();
for (const quad of quads) {
Eif (quad.subject.termType === 'NamedNode') {
namespaceIris.add(Uri.getNamespaceIri(quad.subject.value));
}
Eif (quad.predicate.termType === 'NamedNode') {
namespaceIris.add(Uri.getNamespaceIri(quad.predicate.value));
}
Eif (quad.object.termType === 'NamedNode') {
namespaceIris.add(Uri.getNamespaceIri(quad.object.value));
}
}
// Build prefix map using inference prefixes and default prefixes
const inferencePrefixes = this.prefixLookupService.getInferencePrefixes();
const defaultPrefixes = this.prefixLookupService.getDefaultPrefixes();
const allPrefixes = { ...inferencePrefixes, ...defaultPrefixes };
for (const iri of namespaceIris) {
// allPrefixes is { prefix: iri }, so we need to find the prefix for this iri
for (const [prefix, prefixIri] of Object.entries(allPrefixes)) {
Eif (prefixIri === iri) {
prefixMap[prefix] = iri;
break;
}
}
}
}
const writer = new Writer({
format: 'text/turtle',
prefixes: prefixMap
});
writer.addQuads(store.toArray());
return new Promise<string>((resolve, reject) => {
writer.end((error, result) => {
if (error) {
reject(error);
} else {
resolve(result);
}
});
});
} catch (error) {
console.error('Error serializing quads to Turtle:', error);
return '';
}
}
} |