@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 keys, but only
 * if it is unique!
 * Please note, that `...` is considered special here, anything *afteR* `...` will not be matched by prefix but only by exact name,
 * following R's pmatch semantics.
 * @example
 * ```typescript
 * findByPrefixIfUnique('hello', [ 'hello', 'bar' ]) // => 'hello'
 * findByPrefixIfUnique('hell', [ 'hello', 'bar' ]) // => 'hello'
 * findByPrefixIfUnique('hell', [ 'hello', 'hell' ]) // => 'hell' (full/exact match)
 * findByPrefixIfUnique('hell', [ 'bar', '...', 'hello' ]) // => undefined (not matched due to being after `...`)
 * findByPrefixIfUnique('h', [ 'hello', 'hell' ]) // => undefined (not unique)
 * findByPrefixIfUnique('', [ 'hello', 'hell' ]) // => undefined (empty prefix)
 * ```
 */
function findByPrefixIfUnique(prefix, keys) {
    if (prefix === '') {
        return undefined;
    }
    let found = undefined;
    let matchPartial = true;
    for (const key of keys) {
        if (key === prefix) {
            return key;
        }
        if (key === '...') {
            matchPartial = false;
        }
        else if (matchPartial && key.startsWith(prefix)) {
            if (found) {
                return undefined;
            }
            found = key;
        }
    }
    return found;
}
//# sourceMappingURL=prefix.js.map