@eagleoutice/flowr/util/prefix.js

Static Dataflow Analyzer and Program Slicer for the R Programming Language

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findByPrefixIfUnique = findByPrefixIfUnique;
/**
 * given a potentially partial prefix like `hell`, this finds the matching name in the map, but only
 * if it is unique!
 *
 * @example
 * ```typescript
 * findByPrefixIfUnique('hell', { 'hello', 'bar' }) // => 'hello'
 * findByPrefixIfUnique('hell', { 'hello', 'hell' }) // => 'hell' (full match)
 * findByPrefixIfUnique('h', { 'hello', 'hell' }) // => undefined (not unique)
 * findByPrefixIfUnique('', { 'hello', 'hell' }) // => undefined (empty prefix)
 * ```
 */
function findByPrefixIfUnique(prefix, keys) {
    if (prefix === '') {
        return undefined;
    }
    let found = undefined;
    for (const key of keys) {
        if (key === prefix) {
            return key;
        }
        if (key.startsWith(prefix)) {
            if (found) {
                return undefined;
            }
            found = key;
        }
    }
    return found;
}
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