@tpluscode/sparql-builder/lib/partials/GROUP.js

Simple JS library to build SPARQL queries

import { sparql } from '@tpluscode/rdf-string';
import RDF from '@rdfjs/data-model';
function isTemplateArray(arg) {
    return Array.isArray(arg);
}
function addGrouping(builder) {
    return (strings, ...values) => {
        let by;
        if (isTemplateArray(strings)) {
            by = sparql(strings, ...values);
        }
        else if (typeof strings === 'string') {
            by = sparql `${RDF.variable(strings)}`;
        }
        else {
            by = sparql `${strings}`;
        }
        const grouping = { by };
        const childBuilder = {
            ...builder,
            groupings: [...builder.groupings, grouping],
        };
        const thenBuilder = {
            ...childBuilder,
            THEN: {
                BY: addGrouping(childBuilder),
            },
        };
        return {
            ...thenBuilder,
            AS(variable) {
                if (typeof variable === 'string') {
                    grouping.as = RDF.variable(variable);
                }
                else {
                    grouping.as = variable;
                }
                return thenBuilder;
            },
        };
    };
}
export default () => ({
    groupings: [],
    GROUP() {
        return {
            BY: addGrouping(this),
        };
    },
    groupByClause() {
        if (this.groupings.some(Boolean)) {
            return this.groupings.reduce((result, grouping) => {
                if (grouping.as) {
                    return sparql `${result}\n    (${grouping.by} as ${grouping.as})`;
                }
                return sparql `${result}\n    (${grouping.by})`;
            }, sparql `GROUP BY`);
        }
        return sparql ``;
    },
});