adam-26/react-router-dispatcher-redirect

// TODO: This is exported from react-router, but a new version has not been released
// TODO: Once 4.2.1/4.3.x is released, this file can be deleted

import pathToRegexp from 'path-to-regexp';

const patternCache = {};
const cacheLimit = 10000;
let cacheCount = 0;

const compileGenerator = (pattern) => {
    const cacheKey = pattern;
    const cache = patternCache[cacheKey] || (patternCache[cacheKey] = {});

    if (cache[pattern])
        return cache[pattern];

    const compiledGenerator = pathToRegexp.compile(pattern);

    if (cacheCount < cacheLimit) {
        cache[pattern] = compiledGenerator;
        cacheCount++;
    }

    return compiledGenerator
};

/**
 * Public API for generating a URL pathname from a pattern and parameters.
 */
const generatePath = (pattern = '/', params = {}) => {
    if (pattern === '/') {
        return pattern;
    }
    const generator = compileGenerator(pattern);
    return generator(params);
};

export default generatePath